ALLEGRO 3280 User Manual

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3 280, 3281,

Data Sheet

27609.20b

Suffix '–LT' & '–UA' Pinning

(SOT89/TO-243AA & ultra-mini SIP)

X

PTCT

V

CC

1

SUPPLY

Pinning is shown viewed from branded side.

32

GROUND

Dwg. PH-003-2

OUTPUT

AND

3283

CHOPPER-STABILIZED, PRECISION

HALL-EFFECT LATCHES

The A3280--, A3281--, and A3283-- Hall-effect latches are ex-

tremely temperature-stable and stress-resistant sensors especially suited
for operation over extended temperature ranges to +150°C. Superior
high-temperature performance is made possible through dynamic offset
cancellation, which reduces the residual offset voltage normally caused
by device overmolding, temperature dependencies, and thermal stress.
The three devices are identical except for magnetic switch points.

Each device includes on a single silicon chip a voltage regulator,
Hall-voltage generator, small-signal amplifier, chopper stabilization,
Schmitt trigger, and a short-circuit protected open-collector output to
sink up to 25 mA. A south pole of sufficient strength will turn the
output on. A north pole is necessary to turn the output off. An on-board
regulator permits operation with supply voltages of 4.2 to 24 volts.

The first character of the part number suffix determines the device
operating temperature range; suffix ‘E–’ is for -40°C to +85°C and
‘L–’ is -40°C to +150°C. Three package styles provide a magnetically
optimized package for most applications. Suffix ‘–LH’ is a miniature
SOT23W low-profile surface-mount package, ‘–LT’ is a miniature
SOT89/TO-243AA transistor package for surface-mount applications;
while suffix ‘–UA’ is a three-lead ultra-mini-SIP for through-hole
mounting.

ABSOLUTE MAXIMUM RATINGS

at T

= +25°C

Supply Voltage, VCC........................ 26.5 V

Reverse Battery Voltage, V

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

Output Off Voltage, V
Continuous Output Current,

I

.......................................... 25 mA*

OUT

Reverse Output Current, I
Package Power Dissipation, PD. See Graph

Junction Temperature, TJ............... +165°C

Operating Temperature Range, T

Suffix ‘E–’.................. -40°C to +85°C

Suffix ‘L–’................ -40°C to +150°C

Storage Temperature Range,

TS.............................. -65°C to +170°C

*Internal current limiting is intended to protect
the device from output short circuits.

A

.......... -30 V

RCC

................... 26 V

OUT

........ -50 mA

OUT

A

FEATURES

■ Symmetrical Switch Points

■ Resistant to Physical Stress

■ Superior Temperature Stability

■ Output Short-Circuit Protection

■ Operation From Unregulated Supply

■ Reverse Battery Protection

■ Solid-State Reliability

■ Small Size

Always order by complete part number: the prefix ‘A’ + the basic four­digit part number + a suffix to indicate operating temperature range +
a suffix to indicate package style, e.g., A3281ELH .

3280, 3281,

AND

3283

CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES

FUNCTIONAL BLOCK DIAGRAM

SUPPLY

800

REG.

TO ALL

SUBCIRCUITS

OUTPUT

X

CONTROL

DYNAMIC

OFFSET CANCELLATION

& HOLD

SAMPLE

FILTER

LOW-PASS

CURRENT

LIMIT

<1Ω

GROUND

Dwg. FH-020-1

Suffix ‘–LH’ Pinning

(SOT23W)

700

600

500

Suffix "–LH"
R

θJA

400

300

200

100

ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS

0

20 60 100 140

= 228°C/W

40 80 120 180

Suffix "–UA"
R

θJA

= 165°C/W

Suffix "E–"

AMBIENT TEMPERATURE in °°°°C

2

Suffix "–LT"
R

θJA

= 180°C/W

Suffix "L–"

X

V

CC

12

SUPPLY

160

Dwg. GH-046-2D

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

Copyright © 2000, 2003, 2004 Allegro MicroSystems, Inc.

3

PTCT

GROUND

Dwg. PH-003-4

OUTPUT

3280, 3281,

AND

3283

CHOPPER-STABILIZED,

PRECISION

HALL-EFFECT LATCHES

ELECTRICAL CHARACTERISTICS over operating temperature range.

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Supply Voltage Range V

Output Leakage Current I

Output Saturation Voltage V

OUT(SAT)

Output Current Limit I

Power-On Time t

Chopping Frequency f

Output Rise Time t

Output Fall Time t

Supply Current I

CC

OFF

OM

po

C

r

f

CC

Operating, TJ < 165°C

V

= 24 V, B < B

OUT

I

= 20 mA, B > B

OUT

B > B

OP

VCC > 4.2 V – – 50 µs

RL = 820 Ω, CL = 20 pF – 0.2 2.0 µs

RL = 820 Ω, CL = 20 pF – 0.1 2.0 µs

B < BRP, VCC = 12 V – 3.0 8.0 mA

1

RP

OP

B > BOP, VCC = 12 V – 4.0 8.0 mA

Reverse Battery Current I

CC

Zener Voltage VZ + V

Zener Impedance z

+ z

z

D

D

V

= -30 V – – -5.0 mA

RCC

ICC = 15 mA, TA = 25°C 283237 V

ICC = 15 mA, TA = 25°C–50–Ω

NOTES: 1. Maximum voltage must be adjusted for power dissipation and junction temperature.

2. BOP = operate point (output turns on); BRP = release point (output turns off).

3. Typical Data is at TA = +25°C and VCC = 12 V and is for design information only.

4.2–24V

––10µA

– 185 500 mV

30 – 60 mA

– 340 – kHz

MAGNETIC CHARACTERISTICS over operating voltage range.

Part Numbers

A3280 A3281 A3283

Characteristic Test Conditions Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Units

Operate Point, B

at TA = +25°C and TA = max. 5.0 22 40 15 50 90 100 150 180 G

OP

at TA = -40°C 5.0 – 40 15 – 90 100 – 200 G

Release Point, B

at TA = +25°C and TA = max. -40 -23 -5.0 -90 -50 -15 -180 -150 -100 G

RP

at TA = -40°C -40 – -5.0 -90 – -15 -200 – -100 G

Hysteresis, B

(BOP - BRP)

hys

at TA = +25°C and TA = max. 10 45 80 30 100 180 – 300 360 G

at TA = -40°C – – 80 – – 180 – – 360 G

NOTES: 1. Complete part number includes a suffix to identify operating temperature range (E or L) and

package type (LH, LT, or UA).

2. As used here, negative flux densities are defined as less than zero (algebraic convention) and -50 G is less than +10 G.

3. Typical Data is at TA = +25°C and VCC = 12 V and is for design information only.

4. 1 gauss (G) is exactly equal to 0.1 millitesla (mT).

www.allegromicro.com

1

3

3280, 3281,

AND

3283

CHOPPER-STABILIZED,
PRECISION
HALL-EFFECT LATCHES

TYPICAL OPERATING CHARACTERISTICS

as a function of temperature

A3280* SWITCH POINTS

50
40

30

20

10

0

-10

-20

SWITCH POINTS IN GAUSS

-30

-40

-50

-50

VCC = 4.5 V

CC

= 24 V

V

0 50 100

AMBIENT TEMPERATURE IN °°°°C

A3283* SWITCH POINTS

200

OPERATE POINT

RELEASE POINT

150-25 25 75 125

Dwg. GH-026-3

A3281* SWITCH POINTS

100

80

60

40

20

0

-20

-40

SWITCH POINTS IN GAUSS

-60

-80

-100

-50

VCC = 4.5 V to 24 V

0 50 100

AMBIENT TEMPERATURE IN °°°°C

OPERATE POINT

RELEASE POINT

150-25 25 75 125

Dwg. GH-026-4

160

120

80

40

0

-40

-80

SWITCH POINTS IN GAUSS

-120

-160

-200

-50

VCC = 4.5 V

CC = 24 V

V

0 50 100

AMBIENT TEMPERATURE IN °°°°C

OPERATE POINT

RELEASE POINT

150-25 25 75 125

Dwg. GH-026-6

* Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LH, LT, or UA).

4

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]