Data Sheet

27621.41

The A3250 and A3251 are programmable Hall-effect switches for

high-temperature applications. Each sensor consists of a single ele-
ment, chopper-stabilized Hall-effect IC that can be programmed to the
desired magnetic operate switch point (drastically reducing the effects
of variations found in a production environment), while the hysteresis
remains fixed. The small packages can be easily assembled and used in
conjunction with a wide variety of target shapes and sizes. The A3250
output turns on in the presence of the programmed south-pole magnetic
field while the A3251 turns off with the programmed south-pole
magnetic field.

The first character of the part number suffix indicates the device

operating temperature range. Suffix `E' is for the automotive and
industrial temperature range of -40

C to +85

C. Suffix `L' is for the

automotive and military temperature range of -40

C to +150

C. The

second and third characters indicate the package. Suffix `LT' is a
miniature SOT89/TO-243AA transistor package for surface-mount
applications; suffix `UA' is a three-lead ultra-mini-SIP for through-
hole mounting.

FEATURES AND BENEFITS

s Chopper Stabilized for Extremely Low Switch-Point Drift and

Immunity to Mechanical Stress

s Externally Programmed Switch Point
s On-Chip Supply-Transient Protection
s Output Short-Circuit Protection
s Reverse Battery Protection
s Wide Operating Voltage Range
s Defined Power-On State

3250

AND

3251

Dwg. PH-003-2

SUPPLY

GROUND

OUTPUT

PTCT

Always order by complete part number: the prefix 'A' + the basic four-digit
part number + a suffix to indicate operating temperature range +
a suffix to indicate package style, e.g., A3250LUA .

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, V

........................ 26.5 V*

Reverse Supply Voltage, V

RCC

............ -18 V

Overvoltage Supply Current, I

..... 100 mA

Output Off Voltage, V

OUT

................... 26.5 V

Continuous Output Current, I

OUT

..... 20 mA

Magnetic Flux Density, B ............ Unlimited

Package Power Dissipation, P

... See Graph

Operating Temperature Range, T

Suffix `E' .................... -40

C to +85

Suffix `L' .................. -40

C to +150

Junction Temperature, T

.................. +165

Storage Temperature Range,

................................ -65

C to +170

* Fault conditions that produce supply voltage
transients will be clamped by an internal Zener
diode. These conditions can be tolerated but
should be avoided.
Internal current limiting is intended to protect
the device from output transient short circuits.

PROGRAMMABLE, CHOPPER-

STABILIZED, HALL-EFFECT SWITCHES

PRELIMINARY INFORMATION

(subject to change without notice)

October 15, 2002

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

3250

AND

3251

PROGRAMMABLE,
CHOPPER-STABILIZED,
HALL-EFFECT SWITCHES

FUNCTIONAL BLOCK DIAGRAM

Dwg. FH-020-3

GROUND

OUTPUT

SUPPLY

DYNAMIC

OFFSET CANCELLATION

CURRENT

LIMIT

REG.

LOW-PASS

FILTER

SAMPLE

& HOLD

PROGRAM

LOGIC

OFFSET

ADJUST

POWER-UP

CONTROL

600

400

200

100

140

AMBIENT TEMPERATURE in

°
°
°
°

ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS

Dwg. GH-046-7

Suffix "UA"
R

= 165

C/W

120

180

700

500

300

100

160

800

Suffix "E"

Suffix "L"

Suffix "LT"
R

= 180

C/W

3250

AND

3251

PROGRAMMABLE,

CHOPPER-STABILIZED,

HALL-EFFECT SWITCHES

www.allegromicro.com

ELECTRICAL CHARACTERISTICS over operating voltage and junction temperature range
(unless otherwise noted).

Limits

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Supply Voltage

Operating

4.2

Power-On State

POS

After programming, V

= 0 ¡ 5 V, t > t

A3250, B < B

HIGH

A3251, B < B

LOW

Low Output Voltage

OUT(SAT)

Output on, I

OUT

= 20 mA

175

400

Output Current Limit

OUTM

Pulse test, output on (note 1)

100

Output Leakage Current

OFF

Output off, V

OUT

= 24 V

Supply Current

Output off (High)

4.0

7.0

Output on (Low)

6.0

Reverse Supply Current

RCC

= -18 V

-5.0

Power-On Delay

Output off

Output Rise Time

= 820

, C

= 10 pF

1.55

4.0

Output Fall Time

= 820

, C

= 10 pF

1.95

4.0

Clock Frequency

340

kHz

Zener Voltage

= 100

Zener Resistance

= 10 mA

MAGNETIC CHARACTERISTICS over operating supply voltage and junction temperature range
(unless otherwise noted).

Limits

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Operate Point

Initial (before programming)

5.0

(A3250 output turns on)

Resolution

7.0

(A3251 output turns off)

Maximum programmable

350

Reference B

at +25

C, B

350 G

5.0

Hysteresis

hys

5.0

NOTES: 1. Do not exceed absolute maximum allowable junction temperature.

2. Typical data is at V

= 12 V and T

= +25

C and is for design information only.

3. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

3250

AND

3251

PROGRAMMABLE,
CHOPPER-STABILIZED,
HALL-EFFECT SWITCHES

TYPICAL ELECTRICAL CHARACTERISTICS

100

300

AMBIENT TEMPERATURE IN

°
°
°
°

200

100

-50

Dwg. GH-040-5

SATURATION VOLTAGE IN mV

150

-25

125

I = 20 mA

V = 26.5 V

OUT

100

AMBIENT TEMPERATURE IN

°
°
°
°

-50

Dwg. GH-053-3

125

-25

SUPPLY CURRENT IN mA

8.0

7.0

6.0

5.0

4.0

150

OUTPUT ON

= 26.5 V

= 12 V

= 4.2 V

100

AMBIENT TEMPERATURE IN

°
°
°
°

-50

Dwg. GH-053-4

125

-25

SUPPLY CURRENT IN mA

6.0

5.0

4.0

3.0

2.0

150

OUTPUT OFF

= 26.5 V

= 12 V

= 4.2 V

3250

AND

3251

PROGRAMMABLE,

CHOPPER-STABILIZED,

HALL-EFFECT SWITCHES

www.allegromicro.com

TYPICAL MAGNETIC CHARACTERISTICS

100

AMBIENT TEMPERATURE IN

°
°
°
°

-50

Dwg. GH-044-2

OPERATE POINT IN GAUSS

100

140

150

-25

125

= 12 V

120

ADDRESS 1

ADDRESS 8

ADDRESS 16

100

AMBIENT TEMPERATURE IN

°
°
°
°

-50

Dwg. GH-044-3

RELEASE POINT IN GAUSS

120

150

-20

-25

125

= 12 V

100

ADDRESS 1

ADDRESS 8

ADDRESS 16

100

AMBIENT TEMPERATURE IN

°
°
°
°

-50

Dwg. GH-044-4

HYSTERESIS IN GAUSS

150

-25

125

= 12 V

ADDRESSES 1, 8, & 16

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

3250

AND

3251

PROGRAMMABLE,
CHOPPER-STABILIZED,
HALL-EFFECT SWITCHES

FUNCTIONAL DESCRIPTION

Dwg. EH-012

REG

SAMPLE

& HOLD

The basic Hall sensor is a small sheet of semiconduc-

tor material in which a constant current will flow when a
regulated voltage is applied. The output will take the form
of a voltage measured across the width of the sheet and
will have negligible value in the absence of a magnetic
field. When a magnetic field with flux lines at right angles
to the current flow is applied, a small voltage directly
proportional to the strength of the magnetic field and the
current will occur at the output terminals.

The small signal voltage is proportionally small

relative to the offset produced by the semiconductor chip.
This makes it very difficult to process the signal and
maintain an accurate, reliable output over the operating
temperature range.

Chopper-Stabilized Technique. These devices use a
proprietary dynamic offset cancellation technique, with an
internal high-frequency clock to reduce the residual offset
voltage of the Hall element that is normally caused by
device overmolding, temperature dependencies, and
thermal stress. This technique produces devices that have
an extremely stable quiescent Hall output voltage, are
immune to thermal stress, and have precise recoverability
after temperature cycling. This technique will also slightly
degrade the device output repeatability.

The Hall element can be considered as a resistor array

similar to a Wheatstone bridge. A large portion of the
offset is a result of the mismatching of these resistors. The
chopper-stabilizing technique cancels the mismatching of
the resistors by changing the direction of the current
flowing through the Hall plate and Hall voltage measure-
ment taps, while maintaining the Hall-voltage signal that is
induced by the external magnetic flux. The signal is, then,
captured by a sample-and-hold circuit.

Operation. The output of the A3250 switches low (turns
on) when a magnetic field (south pole) perpendicular to
the Hall sensor exceeds the operate point threshold (B

After turn-on, the output is capable of sinking 20 mA and
the output voltage is V

OUT(SAT)

. The A3250 operate point

is programmable (see next section). When the magnetic
field is reduced below the release point (B

), the device

output goes high (turns off).

HALL
VOLTAGE

Dwg. AH-011-2

OUTPUT VOLTAGE

FLUX DENSITY

Dwg. GH-007-2

OUT(SAT)

A3250 Output characteristic

3250

AND

3251

PROGRAMMABLE,

CHOPPER-STABILIZED,

HALL-EFFECT SWITCHES

www.allegromicro.com

FUNCTIONAL DESCRIPTION (cont'd)

The output of the A3251 switches high (turns off)

when a magnetic field (south pole) perpendicular to the
Hall sensor exceeds the operate point threshold (B

). The

A3251 operate point is programmable (see next section).
When the magnetic field is reduced below the release point
(B

), the device output goes low (turns on). After turn-

on, the output is capable of sinking 20 mA and the output
voltage is V

OUT(SAT)

The difference in the magnetic operate and release

points is the hysteresis (B

hys

) of the device. The hysteresis

of both devices is identical and independent of the pro-
grammed operate point. This built-in hysteresis allows
clean switching of the output even in the presence of
external mechanical vibration and electrical noise.

Output Overloads. Current through the output transis-
tor is sensed with a low-value on-chip aluminum resistor.
The voltage drop across this resistor is fed back to control
the base drive of the output stage. This feedback prevents
the output transistor from exceeding its maximum current
density rating by limiting the output current. Under short-
circuit conditions, the device will dissipate an increased
amount of power (P

= V

OUT

x I

OUTM

) and the output

transistor will be thermally stressed.

OUTPUT VOLTAGE

FLUX DENSITY

Dwg. GH-007-5

OUT(SAT)

A3251 Output characteristic

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

3250

AND

3251

PROGRAMMABLE,
CHOPPER-STABILIZED,
HALL-EFFECT SWITCHES

PROGRAMMING PROTOCOL

The A3250 and A3251 operate points are programmed

by serially addressing the device through the supply
terminal (1). After the correct operate point is determined
(see application note Programming A Back-Biased Switch
For Proximity Sensing), the device programming bits are
selected and blown, then a "lock" bit is selected and blown
to prevent any further (accidental) programming.

Programming voltages (V

, V

, and V

) are applied

to terminal 1 of the device. A minimum capacitance of
0.1

F must be connected between terminal 1 and ground

to provide the necessary peak current to blow the internal
fuse.

d(1)

d(0)

Dwg. WH-013

PROGRAM ENABLE

(AT LEAST 7 PULSES)

d(1)

Figure 1 -- Program enable

PROGRAMMING PROTOCOL over operating temperature range.

Limits

Characteristic

Symbol

Description

Min.

Typ.

Max.

Units

Programming Voltage

Low voltage during programming

4.5

5.0

5.5

High voltage during programming

8.5

Programming enable & bit-blow voltage

Programming Current

Max. supply current during programming

500

Pulse Width

d(0)

Off time between bits

d(1)

Enable, address, program, or lock bit on time

Program pulse on time

100

300

Pulse Rise Time

to V

or V

Pulse Fall Time

or V

to V

5.0

NOTE: Typical data is at T

= +25

C and is for design information only.

Program Enable. To program the device, a sequence of
pulses (as shown in figure 1) is used to activate/enable the
programming mode. This sequence of a V

pulse, at least

seven V

pulses, and a V

pulse with no supply interrup-

tions, is designed to prevent the device from being pro-
grammed accidentally (for example, as a result of noise on
the supply line).

3250

AND

3251

PROGRAMMABLE,

CHOPPER-STABILIZED,

HALL-EFFECT SWITCHES

www.allegromicro.com

* In application, the terms "gear" and "target" are often inter-
changed. However, "gear" is preferred when motion is trans-
ferred.

d(1)

d(0)

Dwg. WH-014A

ADDRESS 1

ADDRESS 2

ADDRESS 3

ADDRESS N-2

ADDRESS N-1

ADDRESS N

(UP TO 63)

Figure 2 -- Code determination

Figure 4 -- Lock programming

d(1)

d(0)

Dwg. WH-016

PROGRAM ENABLE

LOCK PROGRAM

(65 PULSES)

d(1)

Figure 3 -- Switch-point programming example

PROGRAMMING PROTOCOL (cont'd)

Addressing. The magnetic operate point is adjustable in
63 increments (64 addresses including the unprogrammed
address 0). With the appropriate target* in position, up to
63 switch points are sequentially selected (figure 2) until
the required operate point is reached. Note that the
difference between the operate point and the release point
(hysteresis) is a constant for all addresses.

Code Programming. After the desired switch-point
address is determined (0 through 63), each bit of the
equivalent 6-bit binary code is programmed individually
(not at the same time). For example, as illustrated in
figure 3, to program switch-point address 5 (binary code
000101), bits 3 and 1 need to be programmed. Each bit is
programmed (blown) during the wide V

pulse and is not

reversible.

Lock-Bit Programming. After the desired binary code
is programmed, the lock bit (address 65) is then pro-
grammed (blown) (figure 4) to prevent further program-
ming of the device.

Each device should then be tested by turning it off and

then on again to ensure that proper programming has been
accomplished (verifying proper switch points).

d(1)

d(0)

Dwg. WH-015A

PROGRAM ENABLE

BIT 1 PROGRAM

(CODE 000001)

ADDRESS 1

BIT 3 PROGRAM

(CODE 000100)

ADDRESS 4

PROGRAM ENABLE

d(1)

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

3250

AND

3251

PROGRAMMABLE,
CHOPPER-STABILIZED,
HALL-EFFECT SWITCHES

External Components. It is strongly recommended
that an external bypass capacitor be connected (less than
5 mm from the Hall sensor) between the supply and
ground of the device to reduce both external noise and
noise generated by the chopper-stabilization technique.

A series resistor (R

) in combination with the bypass

capacitor prevents external EMC pulses from affecting the
sensor. The voltage drop across this resistor subtracts
from the supply voltage and must be considered.

SUPPLY

CC(min)

+ (I

x R

)

where V

SUPPLY

is the minimum supply value (including

transients), V

CC(min)

is the specified minimum supply

voltage, I

is the specified maximum supply current and

is the maximum series-resistor value (including toler-

ances). A low operating supply voltage requires a low-
value resistor, but noise and other considerations suggest a
high-value resistor. Therefore, specify the highest value
resistor that will still allow meeting the minimum operat-
ing supply voltage requirement. This will also help to
minimize package power dissipation (especially under
over-voltage conditions).

If not included as part of the load, the output pullup

resistor should be chosen to limit the current through the
output transistor. Do not exceeed the absolute maximum
rated output current. Internal current limiting is only
intended to protect the device from output short circuits.

+5 V

OUTPUT

Dwg. EH-013-3

0.1

SUPPLY

PTCT

1.2 k

APPLICATIONS INFORMATION

Power Derating. Due to the internal device power
dissipation, the junction temperature (T

) will be higher

than the ambient temperature (T

). To ensure that the

absolute maximum junction temperature is not exceeded,
the following equations should be applied:

= T

+ (P

x R

)

where P

is the sum of the supply power

x V

and the output power

OUT

x V

OUT(SAT)

and R

is the package thermal resistance. The specified

limits for I

and V

OUT(SAT)

should be used to ensure a

margin of safety. Note that if an over-voltage condition
occurs, I

will increase, limited only by the Zener

voltage and the external R

, and the device will likely be

thermally stressed.

Magnets. The simplest form of magnet that will operate
these devices is a button magnet. Other methods of
operation, such as linear magnets, are possible.

Typical application

3250

AND

3251

PROGRAMMABLE,

CHOPPER-STABILIZED,

HALL-EFFECT SWITCHES

www.allegromicro.com

All Allegro sensors are subjected to stringent qualification requirements prior to being released to production.

To become qualified, except for the destructive ESD tests, no failures are permitted.

CRITERIA FOR DEVICE QUALIFICATION

Qualification Test

Test Method and Test Conditions

Test Length

Samples

Comments

Biased Humidity (HAST)

JESD22-A101,

1000 hrs

= V

OUT

= 4.2 V

= 85

C, RH = 85%

High-Temperature

JESD22-A108,

1000 hrs

Operating Life (HTOL)

= 150

C, T

= 165

Accelerated HTOL

JESD22-A108,

168 hrs

= 170

C, T

= 180

Autoclave, Unbiased

JESD22-A102, Condition C,

96 hrs

= 121

C, 15 psig

High-Temperature

MIL-STD-883, Method 1008,

1000 hrs

(Bake) Storage Life

= 170

Temperature Cycle

MIL-STD-883, Method 1010,

1000 cycles

-55

C to +150

ESD,

CDF-AEC-Q100-002

Pre/Post

3 per

Test to failure,

Human Body Model

Reading

test

All leads > 1 kV

ESD,

JESD22-A115

Pre/Post

3 per

Test to failure,

Machine Model

Reading

test

All leads > 200 V

Electrical Distributions

Per Specification

APPLICATIONS INFORMATION (cont'd)

Extensive applications information for Hall-effect

sensors is available in:
· Hall-Effect IC Applications Guide, Application Note
27701;
· Hall-Effect Devices: Soldering, Gluing, Potting, Encap-
sulating, and Lead Forming, Application Note 27703.1;
· Soldering of Through-Hole Hall-Sensor Dervices,
Application Note 27703; and
· Soldering of Surface-Mount Hall-Sensor Devices,
Application Note 27703.2.

More detailed descriptions of the chopper-stabilized
circuit operation can be found in:
· Monolithic Magnetic Hall Sensor Using Dynamic
Quadrature Offset Cancelation, Technical Paper STP 97-
10; and
· Chopper-Stabilized Amplifiers With A Track-and-Hold
Signal Demodulator, Technical Paper STP 99-1.

All are provided in Allegro Electronic Data Book, AMS-
702 or at

www.allegromicro.com

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

3250

AND

3251

PROGRAMMABLE,
CHOPPER-STABILIZED,
HALL-EFFECT SWITCHES

Performance Class at Test Level

Pulse No.

Test

III

Inductive turn off (negative)

Inductive turn off (positive)

Capacitive/inductive coupling (neg)

Capacitive/inductive coupling (pos)

Reverse battery

Load dump:

Ignition coil disconnect

Field decay (negative)

Transient Performance per ISO 7637-1

at T

= 23

(Tested at Allegro test facility -- for engineering reference only)

Power supply voltage transients, or device output

short circuits, may be caused by faulty connectors,
crimped wiring harnesses, or service errors. To prevent
catastrophic failure, internal protection against overvolt-
age, reverse voltage, and output overloads have been
incorporated to meet the automotive 12 volt system
protection requirements of ISO DP7637/1. A series-
blocking diode or current-limiting resistor is required in
order to survive pulse number six.

Transient & EMC test circuit

+5 V

Dwg. EH-013-4

0.1

PTCT

100

1.2 k

Performance Class Definitions

(for transient performance and EMC performance)

A -- All functions of a device perform as designed during
and after the exposure.

B -- All functions of a device perform as designed during
exposure; however, one or more of them may go beyond
the specified limit tolerance. All functions return auto-
matically to within normal limits afer exposure is re-
moved. Memory must remain Class A.

C -- One or more functions of the device do not perform
as designed during exposure but return automatically to
normal operation after exposure is removed.

D -- One or more functions of the device do not perform
as designed during exposure and do not return to normal
operation until exposure is removed and the device is reset
by simple "operator" action.

E -- One or more functions of the device do not operform
as designed during and after the exposure and cannot be
returned to proper operation without repairing or replacing
the device.

3250

AND

3251

PROGRAMMABLE,

CHOPPER-STABILIZED,

HALL-EFFECT SWITCHES

www.allegromicro.com

Frequency

Performance Class at Test Level

band (MHz)

III

F1 (1 to 10)

F2 (10 to 30)

F3 (30 to 80)

F4 (80 to 200)

F5 (200 to 400)

Frequency

Performance Class at Test Level

band (MHz)

III

F1 (0.01 to 10)

F2 (0 to 30)

F3 (30 to 80)

F4 (80 to 200)

Transferse Electro-Magnetic (TEM) Radiation Performance per ISO 11452-3

Test severity level

I = 50 V/m

II = 100 V/m

III = 150 V/m

IV = 200 V/m

Bulk Current Injection (BCI) per ISO 11452-4

Test severity level

I = 25 mA

II = 50 mA

III = 75 mA

IV = 100 mA

TBD

Frequency

Performance Class at Test Level

band (MHz)

III

F1 (0.25 to 10)

F2 (10 to 30)

F3 (30 to 80)

F4 (80 to 200)

F5 (200 to 400)

Direct RF per ISO 11452-7

Test severity level

I = 100 mW

II = 200 mW

III = 300 mW

IV = 400 mW

V = 500 mW

ELECTROMAGNETIC COMPATIBILITY (EMC) PERFORMANCE

at T

= 23

(Tested at Allegro test facility -- for engineering reference only)

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

3250

AND

3251

PROGRAMMABLE,
CHOPPER-STABILIZED,
HALL-EFFECT SWITCHES

Sensor locations

(

0.005" [0.13 mm] die placement)

Although sensor location is accurate to three sigma for a

particular design, product improvements may result in small
changes to sensor location.

Dwg. MH-011-9B

0.0195"
0.50 mm
NOM

BRANDED
SURFACE

ACTIVE AREA DEPTH

0.080"

2.04 mm

0.056"

1.44 mm

The products described herein are manufactured under one or more

of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283;
5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719;
5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents
pending.

Allegro MicroSystems, Inc. reserves the right to make, from time to

time, such departures from the detail specifications as may be required
to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.

Allegro products are not authorized for use as critical components

in life-support appliances, devices, or systems without express written
approval.

The information included herein is believed to be accurate and

reliable. However, Allegro MicroSystems, Inc. assumes no responsibil-
ity for its use; nor for any infringements of patents or other rights of
third parties that may result from its use.

Allegro

Package designator `UA'

Package designator `LT'

0.045"
1.14 mm

Dwg. MH-008-8A

0.0305"
0.775 mm
NOM

ACTIVE AREA DEPTH

0.088"

2.24 mm

3250

AND

3251

PROGRAMMABLE,

CHOPPER-STABILIZED,

HALL-EFFECT SWITCHES

www.allegromicro.com

MECHANICAL DIMENSIONS

Package designator `LT'

(SOT89/TO-243AA)

Dimensions in Inches

(for reference only)

Dimensions in Millimeters

(controlling dimensions)

NOTES: 1.

Exact body and lead configuration at vendor's option within limits shown.

Supplied in bulk pack (500 pieces per bag) or add "TR" to part number for tape and reel.

Only low-temperature (

240

C) reflow-soldering techniques are recommended for SOT89 devices.

Dwg. MA-009-3A in

0.072
0.064

0.167
0.155

0.059

BSC

0.0189
0.0142

0.047
0.035

0.102
0.090

0.063
0.055

0.0173
0.0138

0.090
0.084

0.0221
0.0173

0.118

BSC

0.181
0.173

Dwg. MA-009-3A mm

4.60
4.40

1.83
1.62

4.25
3.94

1.50

BSC

0.48
0.36

1.20
0.89

2.60
2.29

1.60
1.40

0.44
0.35

2.29
2.13

0.56
0.44

3.00

BSC

0.098

0.031

0.102

0.047

0.181

0.079

Dwg. MA-012-3 in

Pads 1, 2, 3, and A -- Standard SOT89 Layout
Pads 1, 2, 3, and B -- Low-Stress Version
Pads 1, 2, and 3 only -- Lowest Stress, But Not Self Aligning

0.028

TYP

0.031

TYP

2.5

0.8

2.6

1.2

4.6

2.0

Dwg. MA-012-3 mm

Pads 1, 2, 3, and A -- Standard SOT89 Layout
Pads 1, 2, 3, and B -- Low-Stress Version
Pads 1, 2, and 3 only -- Lowest Stress, But Not Self Aligning

0.7

TYP

0.8

TYP

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

3250

AND

3251

PROGRAMMABLE,
CHOPPER-STABILIZED,
HALL-EFFECT SWITCHES

Dimensions in Inches

(controlling dimensions)

Dimensions in Millimeters

(for reference only)

Package designator `UA'

NOTES: 1.

Tolerances on package height and width represent
allowable mold offsets. Dimensions given are
measured at the widest point (parting line).

Exact body and lead configuration at vendor's option
within limits shown.

Height does not include mold gate flash.

Recommended minimum PWB hole diameter to clear
transition area is 0.035" (0.89 mm).

Where no tolerance is specified, dimension is nominal.

Supplied in bulk pack (500 pieces per bag).

Dwg. MH-014E in

0.164
0.159

0.062
0.058

0.0173
0.0138

0.050

BSC

0.640
0.600

0.0189
0.0142

0.085

MAX

0.031

0.122
0.117

SEE NOTE

Dwg. MH-014E mm

4.17
4.04

1.57
1.47

0.44
0.35

1.27

BSC

16.26
15.24

0.48
0.36

2.16

MAX

0.79

3.10
2.97

SEE NOTE

Radial Lead Form (order A325xxUA-LC)

NOTE:

Lead-form dimensions are the nominals produced on the
forming equipment. No dimensional tolerance is implied or
guaranteed for bulk packaging (500 pieces per bag).

0.620"
0.500"

(15.7 mm
12.7 mm)

0.100"

(2.5 mm)

Dwg. MH-026

0.108"

(2.74 mm)

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: A3250

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: A3250