ALLEGRO A3230 User Manual

Package LH, 3-pin Surface Mount

GND

3

A3230

Chopper-Stabilized

Hall-Effect Bipolar Switch

The A3230 Hall-effect sensor is a temperature stable, stress-resistant bipolar
switch. This sensor is the most sensitive Hall-effect device in the Allegro® bipolar
switch family and is intended for ring-magnet sensing. Superior high-temperature
performance is made possible through an Allegro patented dynamic offset cancel­lation that utilizes chopper-stabilization. This method reduces the offset voltage
normally caused by device overmolding, temperature dependencies, and thermal
stress.

VCC

1

2

VOUT

3

Package UA, 3-pin SIP

1 32

VCC

GND

VOUT

1

2

3

AB SO LUTE MAX I MUM RAT INGS

Supply Voltage, VCC..........................................28 V

Reverse-Supply Voltage, V
Output Off Voltage, V
Output Current, I
Reverse-Output Current, I

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

Operating Temperature
Ambient, T
Ambient, T
Maximum Junction, T
Storage Temperature, T

OUT

OUTSINK

, Range E..................–40ºC to 85ºC

A

, Range L................–40ºC to 150ºC

A

........................–18 V

RCC

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

........... Internally Limited

....................–10 mA

ROUT

......................165ºC

J(MAX)

.................. –65ºC to 170ºC

S

The A3230 includes the following on a single silicon chip: a voltage regulator,
Hall-voltage generator, small-signal amplifi er, chopper stabilization, Schmitt
trigger, and a short circuit protected open-drain output. Advanced BiCMOS wafer
fabrication processing takes advantage of low-voltage requirements, component
matching, very low input-offset errors, and small component geometries.

The A3230 Hall-effect bipolar switch turns on in a south polarity magnetic fi eld of
suffi cient strength and switches off in a north polarity magnetic fi eld of suffi cient
strength. Because the output state is not defi ned if the magnetic fi eld is diminished
or removed, to ensure that the device switches, Allegro recommends using mag­nets of both polarities and of suffi cient strength in the application.

The A3230 is rated for operation between the ambient temperatures –40°C and
85°C for the E temperature range, and –40°C to 150°C for the L temperature

Two A3230 package styles provide magnetically optimized solutions

range.

for most applications. Package LH is a SOT23W, a miniature low-profi le
surface-mount package, while package UA is a three-lead ultramini SIP for
through-hole mounting. Each package is available in a lead (Pb) free version,
with 100% matte tin plated leadframes.

Features and Benefi ts

Chopper stabilization

 Superior temperature stability

 Extremely low switchpoint drift

 Insensitive to physical stress

Reverse battery protection

Output short circuit protection

Solid state reliability

Small size

Robust EMC capability

High ESD ratings (HBM)

A3230-DS

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

A3230

Chopper-Stabilized Hall Effect Bipolar Switch

Product Selection Guide

Part Number

A3230ELHLT –
A3230ELHLT-T Yes
A3230EUA –
A3230EUA-T Yes
A3230LLHLT –
A3230LLHLT-T Yes
A3230LUA –
A3230LUA-T Yes

Pb-

free

Packing* Mounting

7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount

Bulk, 500 pieces/bag 3-pin SIP through hole

7-in. reel, 3000 pieces/reel 3-pin SOT23W surface mount

Bulk, 500 pieces/bag 3-pin SIP through hole

*Contact Allegro for additional packing options.

VCC

Functional Block Diagram

Regulator

To All Subcircuits

Ambient, T

(°C)

–40 to 85

–40 to 150

B

A

RP(MIN)

(G)

B

OP(MAX)

(G)

–25 25

VOUT

A3230-DS

Amp

Cancellation

Dynamic Offset

Sample and Hold

Filter

Low-Pass

Control

Current Limit

Terminal List

Name Description

VCC Connects power supply to chip 1 1

VOUT Output from circuit 2 3

GND Ground 3 2

Package LH Package UA

<1Ω

GND

Number

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

2

A3230

Chopper-Stabilized Hall Effect Bipolar Switch

OPERATING CHARACTERISTICS valid over full operating voltage and ambient temperature ranges, unless otherwise noted

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Electrical Characteristics

Supply Voltage

Output Leakage Current I

Output On Voltage V

Output Current Limit I

Power-On Time t

Chopping Frequency f

Output Rise Time

Output Fall Time

Supply Current

Reverse Battery Current I

Supply Zener Clamp Voltage V

Supply Zener Current

Magnetic Characteristics

Operate Point B

Release Point B

Hysteresis B

1

Maximum voltage must be adjusted for power dissipation and junction temperature, see Power Derating section.

2

CS = oscilloscope probe capacitance.

3

Maximum current limit is equal to the maximum I

4

Magnetic fl ux density, B, is indicated as a negative value for north-polarity magnetic fi elds, and as a positive value for south-polarity magnetic fi elds.
This so-called algebraic convention supports arithmetic comparison of north and south polarity values, where the relative strength of the fi eld is indicated
by the absolute value of B, and the sign indicates the polarity of the fi eld (for example, a –100 G fi eld and a 100 G fi eld have equivalent strength, but
opposite polarity).

1

2

2

3

4

V

CC

OUTOFF

OUT(SAT)IOUT

OM

PO

c

t

r

t

f

I

CCON

I

CCOFF

RCC

Z

I

Z

OP

RP

HYS

Operating, TJ < 165°C 3.6 – 24 V

V

OUT

B > B

VCC > 3.6 V – 8 50 µs

R

LOAD

R

LOAD

B > B

B < B

V

RCC

ICC = 8 mA; TA = 25°C 28 – – V

VS = 28 V – – 8 mA

South pole adjacent to branded face of device –10 7.5 25

North pole adjacent to branded face of device –25 –7.5 10

B

CC(MAX)

= 24 V, B < B

= 20 mA, B > B

OP

RP

OP

– – 10 µA

– 250 500 mV

30 – 60 mA

– 200 – kHz

= 820 Ω, CS = 20 pF – 0.2 1 µs

= 820 Ω, CS = 20 pF – 0.2 1 µs

OP

RP

– 1.6 5 mA

– 1.6 5 mA

= –18 V – – –2 mA

– B

OP

+ 3 mA.

RP

51525

G

G

G

A3230-DS

DEVICE QUALIFICATION PROGRAM

Contact Allegro for information.

EMC (Electromagnetic Compatibility) REQUIREMENTS

Contact Allegro for information.

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

3

A3230

Chopper-Stabilized Hall Effect Bipolar Switch

Electrical Characteristic Data

Supply Current (On) versus Ambient Temperature

5.0

4.0

3.0

(mA)

2.0

CCON

I

1.0

0

–50 0 50 100 150

TA (°C)

Supply Current (Off) versus Ambient Temperature

5.0

4.0

3.0

(mA)

2.0

CCOFF

I

VCC (V)

VCC (V)

Supply Current (On) versus Supply Voltage

5.0

4.0

24

3.6

3.0

(mA)

2.0

CCON

I

1.0

0

0 5 10 15 20 25

VCC (V)

Supply Current (Off) versus Supply Voltage

5.0

4.0

3.0

24

3.6

(mA)

2.0

CCOFF

I

TA (°C)

–40

25

150

TA (°C)

–40

25

150

1.0

0

–50 0 50 100 150

TA (°C)

Output Voltage (On) versus Ambient Temperature

500

450

400

350

300

(mV)

250

200

OUT(SAT)

150

V

100

50

0

–50 0 50 100 150

TA (°C)

VCC (V)

24

3.6

1.0

0

0 5 10 15 20 25

VCC (V)

Output Voltage (On) versus Supply Voltage

500

450

400

350

300

(mV)

250

200

OUT(SAT)

150

V

100

50

0

0 5 10 15 20 25

VCC (V)

TA (°C)

–40

25

150

A3230-DS

Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

www.allegromicro.com

4