Allegro A3281LUA, A3281LLT, A3281LLH, A3281EUA-TL, A3281EUA Datasheet

Suffix '–LT' & '–UA' Pinning

X
		PTCT
VCC
1	2	3

SUPPLY	GROUND	OUTPUT
		Dwg. PH-003-2

Pinning is shown viewed from branded side.

ABSOLUTE MAXIMUM RATINGS

at TA = +25°C

Supply Voltage, VCC	........................		26.5 V
Reverse Battery Voltage, VRCC			.......... -30 V
Magnetic Flux Density, ...........B			Unlimited
Output Off Voltage, V ...................OUT			26 V
Continuous Output Current,
IOUT .......................	Internally Limited
Reverse Output Current, ........IOUT			-50 mA
Package Power Dissipation, PD . See Graph
Junction Temperature, ...............TJ			+170°C
Operating Temperature Range, TA
Suffix ‘E–’..................		-40°C to +85°C
Suffix ‘L–’................		-40°C to +150°C
Storage Temperature Range,
TS ..............................		-65°C to +170°C

	3280, 3281,	20.27609	SheetData
	AND 3283

CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES

The A3280--, A3281--, and A3283-- Hall-effect latches are extremely 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 low-profile surface-mount package, ‘–LT’ is a miniature SOT-89/TO- 243AA transistor package for surface-mount applications; while suffix ‘–UA’ is a three-lead ultra-mini-SIP for through-hole mounting.

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
	REG.		TO ALL
			SUBCIRCUITS
		OFFSET CANCELLATION					OUTPUT
X	DYNAMIC		SAMPLE & HOLD	LOW-PASS	FILTER
						CONTROL
						CURRENT
						LIMIT
						<1Ω	GROUND
							Dwg. FH-020-1

	700
in MILLIWATTS	600
	500			Suffix "–UA"
DISSIPATION
				RθJA = 206°C/W
	400		Suffix "–LT"			Suffix "–LH"
			RθJA = 258°C/W			RθJA = 248°C/W
POWER
	300
PACKAGE	200
ALLOWABLE	100
			Suffix "E–"				Suffix "L–"
	0
		40		80		120		160	180
	20		60		100		140

AMBIENT TEMPERATURE in °C

Dwg. GH-046-2C

Suffix ‘–LH’ Pinning

	3
X
	PTCT
VCC
1	2

SUPPLY	GROUND	OUTPUT
		Dwg. PH-003-4

2	115 Northeast Cutoff, Box 15036
	Worcester, Massachusetts 01615-0036 [phone]

Copyright © 2000 Allegro MicroSystems, Inc.

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	VCC	Operating, TJ < 170°C1	4.2	–	24	V
Output Leakage Current	IOFF	VOUT = 24 V, B < BRP	–	–	10	µA
Output Saturation Voltage	VOUT(SAT)	IOUT = 20 mA, B > BOP	–	185	500	mV
Output Current Limit	IOM	B > BOP	30	–	60	mA
Power-On Time	tpo	VCC > 4.2 V	–	–	50	µs
Chopping Frequency	fC		–	340	–	kHz
Output Rise Time	tr	RL = 820 Ω, CL = 20 pF	–	0.2	2.0	µs
Output Fall Time	tf	RL = 820 Ω, CL = 20 pF	–	0.1	2.0	µs
Supply Current	ICC	B < BRP, VCC = 12 V	–	3.0	8.0	mA
		B > BOP, VCC = 12 V	–	4.0	8.0	mA
Reverse Battery Current	ICC	VRCC = -30 V	–	–	-5.0	mA
Zener Voltage	VZ + VD	ICC = 15 mA, TA = 25°C	28	32	37	V
Zener Impedance	zz + zD	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.

MAGNETIC CHARACTERISTICS over operating supply voltage range.

						Part Numbers1
			A3280			A3281				A3283
Characteristic	Test Conditions	Min.	Typ.	Max.	Min.	Typ.	Max.		Min.	Typ.	Max.	Units
Operate Point, BOP	at TA = +25°C and TA = max.	5.0	22	40	15	50	90		100	150	180	G
	at TA = -40°C	5.0	–	40	15	–	90		100	–	200	G
Release Point, BRP	at TA = +25°C and TA = max.	-40	-23	-5.0	-90	-50	-15		-180	-150	-100	G
	at TA = -40°C	-40	–	-5.0	-90	–	-15		-200	–	-100	G
Hysteresis, Bhys	at TA = +25°C and TA = max.	10	45	80	30	100	180		–	300	360	G
(BOP - BRP)	at TA = -40°C	–	–	80	–	–	180		–	–	400	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.

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3280, 3281, AND 3283

CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES

TYPICAL OPERATING CHARACTERISTICS as a function of temperature

SWITCH POINTS IN GAUSS

A3280* SWITCH POINTS

A3281* SWITCH POINTS

50										100
40										80
30				OPERATE POINT						60				OPERATE POINT
									GAUSS
20										40
10									IN	20
	VCC = 4.5 V
-10									POINTS	-20	VCC = 4.5 V to 24 V
0	VCC = 24 V									0
-20			RELEASE POINT						SWITCH	-40
														RELEASE POINT
-30										-60
-40										-80
-50										-100
-50	-25	0	25	50	75	100	125	150		-50	-25	0	25	50	75	100	125	150
		AMBIENT TEMPERATURE IN °C					Dwg. GH-026-3					AMBIENT TEMPERATURE IN °C					Dwg. GH-026-4

	200
	160
GAUSS	120
	40
	80
IN	-40
POINTS
SWITCH	0
	-80
	-120
	-160
	-200
	-50

A3283* SWITCH POINTS

OPERATE POINT

VCC = 4.5 V

VCC = 24 V

RELEASE POINT

-25

0

25

50

75

100

125

150

AMBIENT TEMPERATURE IN °C

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]