Allegro A3189LUA, A3189LU, A3189LLT, A3189EUA, A3189EU Datasheet

3185 THRU

3189

Sheet Data 2A.27609

HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION

X

VCC

	1		2		3

SUPPLY	GROUND	OUTPUT
		Dwg. PH-003A

Pinning is shown viewed from branded side.

ABSOLUTE MAXIMUM RATINGS

at TA = +25°C

Supply Voltage, VCC ............................	30 V
Reverse Battery Voltage, VRCC ...........	-30	V
Magnetic Flux Density, B ...........	Unlimited
Output OFF Voltage, VOUT ..................	30 V
Reverse Output Voltage, VOUT ..........	-0.5	V

Continuous Output Current, IOUT ..... 25 mA

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

These Hall-effect latches are extremely temperature-stable and stressresistant sensors especially suited for operation over extended temperature ranges to +150°C. Superior high-temperature performance is made possible through a novel Schmitt trigger circuit that maintains operate and release point symmetry by compensating for temperature changes in the Hall element. Additionally, internal compensation provides magnetic switch points that become more sensitive with temperature, hence offsetting the usual degradation of the magnetic field with temperature. The symmetry capability makes these devices ideal for use in pulse-counting applications where duty cycle is an important parameter. The four basic devices (3185, 3187, 3188, and 3189) are identical except for magnetic switch points.

Each device includes on a single silicon chip a voltage regulator, quadratic Hall-voltage generator, temperature compensation circuit, signal amplifier, Schmitt trigger, and a buffered open-collector output to sink up to 25 mA. The on-board regulator permits operation with supply voltages of 3.8 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 suffix ‘L–’ is for -40°C to +150°C. Three package styles provide a magnetically optimized package for most applications. Suffix ‘–LT’ is a miniature SOT- 89/TO-243AA transistor package for surface-mount applications; suffix ‘–U’ is a three-lead plastic mini-SIP, while suffix ‘–UA’ is a three-lead ultra-mini- SIP.

FEATURES

■Symmetrical Switch Points

■Superior Temperature Stability

■Operation From Unregulated Supply

■Open-Collector 25 mA Output

■Reverse Battery Protection

■Activate With Small, Commercially Available Permanent Magnets

■Solid-State Reliability

■Small Size

■Resistant to Physical Stress

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., A3185ELT .

3185 THRU 3189

HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION

FUNCTIONAL BLOCK DIAGRAM

1 VCC

REG.

X

3 OUTPUT

2 GROUND

Dwg. FH-005-3

ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 12 V.

				Limits
Characteristic	Symbol	Test Conditions	Min.	Typ.	Max.	Units
Supply Voltage	VCC	Operating	3.8	—	24	V
Output Saturation Voltage	VOUT(SAT)	IOUT = 20 mA, B > BOP	—	175	400	mV
Output Leakage Current	IOFF	VOUT = 24 V, B < BRP	—	0.05	5.0	µA
Supply Current	ICC	B < BRP (Output OFF)	—	4.75	8.0	mA
		B > BOP (Output ON)	—	5.7	—	mA
Output Rise Time	tr	RL = 820 Ω, CL = 20 pF	—	100	—	ns
Output Fall Time	tf	RL = 820 Ω, CL = 20 pF	—	100	—	ns

MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range.

						Part Numbers*
			A3185		A3187		A3188		A3189
Characteristic			Min.	Max.	Min.	Max.	Min.	Max.	Min.	Max.
BOP at TA = 25°C			170	270	50	150	100	180	50	230
over operating temp. range			140	300	50	175	80	200	50	250
BRP at TA = 25°C			-270	-170	-150	-50	-180	-100	-230	-50
over operating temp. range			-300	-140	-175	-50	-200	-80	-250	-50
Bhys at TA = 25°C			340	540	100	300	200	360	100	460
over operating temp. range			280	600	100	350	160	400	100	500

NOTES: BOP = operate point (output turns ON); BRP = release point (output turns OFF); Bhys = hysteresis (BOP - BRP). As used here, negative flux densities are defined as less than zero (algebraic convention).

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

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 [phone]

Copyright © 1995, 1999, Allegro MicroSystems, Inc.

3185 THRU 3189

HALL-EFFECT LATCHES FOR HIGH-TEMPERATURE OPERATION

TYPICAL OPERATING CHARACTERISTICS

				A3185* SWITCH POINTS
	300
	200
GAUSSIN				OPERATE POINT
	100									VCC =	12 V
POINT	0
SWITCH	-100
								RELEASE POINT
	-200
	-300
	-50		-25 0 25 50 75 100 125 150

AMBIENT TEMPERATURE IN °C

Dwg. GH-026

OUTPUT SATURATION VOLTAGE

300

			I OUT = 20 mA
			VCC = 4.5–24 V
IN mV	200
VOLTAGE
SATURATION	100
	0								150
	-50	-25	0	25	50	75	100	125
			AMBIENT TEMPERATURE IN °C
								Dwg. GH-029

SUPPLY CURRENT

10

8.0

IN mA
					B ≥ B OP
CURRENT	6.0
							B ≤ BRP
SUPPLY	4.0
	2.0							TA = +25°C
	0
	0		5	10		15	20			25

SUPPLY VOLTAGE IN VOLTS

Dwg. GH-030

					A3187* SWITCH POINTS
	150
	100
					OPERATE POINT
GAUSSIN	50																VCC =		12 V
POINT	0
SWITCH	-50													RELEASE POINT
	-100
	-150
	-50			-25		0		25				50		75			100		125					150
						AMBIENT TEMPERATURE IN °C																Dwg. GH-027
						SUPPLY CURRENT
	7.0
mA	6.0																			VCC = 12 V
IN
									B ≥ B OP
CURRENT
SUPPLY	5.0
																		B ≤ BRP
	4.0
	-50			-25		0		25				50		75			100		125					150
						AMBIENT TEMPERATURE IN °C																Dwg. GH-028
								OPERATE POINT
GAUSS	20
	15
IN																		TA = +25°C
POINT	10
OPERATEIN	5.0
CHANGE
	0
	-5.0
	0			5				10						15					20					25

SUPPLY VOLTAGE IN VOLTS

Dwg. GH-037

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