Document
3141 THRU 3144
SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION
These Hall-effect switches are monolithic integrated circuits with tighter magnetic specifications, designed to operate continuously over extended temperatures to +150°C, and are more stable with both temperature and supply voltage changes. The unipolar switching characteristic makes these devices ideal for use with a simple bar or rod magnet. The four basic devices (3141, 3142, 3143, and 3144) are identical except for magnetic switch points. Each device includes a voltage regulator for operation with supply voltages of 4.5 to 24 volts, reverse battery protection diode, quadratic Hall-voltage generator, temperature compensation circuitry, smallsignal amplifier, Schmitt trigger, and an open-collector output to sink up to 25 mA. With suitable output pull up, they can be used with bipolar or CMOS logic circuits. The A3141– and A3142– are improved replacements for the UGN/UGS3140–; the A3144– is the improved replacement for the UGN/UGS3120–. The first character of the part number suffix determines 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. Three package styles provide a magnetically optimized package for most applications. Suffix ‘–LT’ is a miniature SOT89/TO-243AA transistor package for surface-mount applications; suffix ‘–UA’ is a three-lead ultra-mini-SIP.
Data Sheet 27621.6B*
V
X
CC
1
2
3
GROUND
Dwg. PH-003A
Pinning is shown viewed from branded side.
OUTPUT
SUPPLY
FEATURES and BENEFITS
ABSOLUTE MAXIMUM RATINGS at TA = +25°C
Supply Voltage, VCC ............................ 28 V Reverse Battery Voltage, VRCC ........... -35 V Magnetic Flux Density, B .......... Unlimited Output OFF Voltage, VOUT .................. 28 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
s s s s s s s s
Superior Temp. Stability for Automotive or Industrial Applications 4.5 V to 24 V Operation … Needs Only An Unregulated Supply Open-Collector 25 mA Output … Compatible with Digital Logic 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, e.g., A3141ELT .
3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMP. OPERATION
FUNCTIONAL BLOCK DIAGRAM
1
VCC
REG.
X
3
OUTPUT GROUND
2
Dwg. FH-005-2
ELECTRICAL CHARACTERISTICS at VCC = 8 V over operating temperature range.
Limits Characteristic Supply Voltage Output Saturation Voltage Output Leakage Current Supply Current Output Rise Time Output Fall Time Symbol VCC VOUT(SAT) IOFF ICC tr tf Test Conditions Operating IOUT = 20 mA, B > BOP VOUT = 24 V, B < BRP B < BRP (Output OFF) RL = 820 Ω, CL = 20 pF RL = 820 Ω, CL = 20 pF Min. 4.5 — — — — — Typ. — 175 <1.0 4.4 0.04 0.18 Max. 24 400 10 9.0 2.0 2.0 Units V mV µA mA µs µs
MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range.
Part Numbers* A3141– Characteristic BOP at TA = 25°C over operating temp. range BRP at TA = 25°C over operating temp. range Bhys at TA = 25°C over operating temp. range Min. 50 30 10 10 20 20 Typ. 100 100 45 45 55 55 Max. 160 175 130 145 80 80 A3142– Min. Typ. 130 115 75 60 30 30 180 180 125 125 55 55 Max. 230 245 175 190 80 80 Min. 220 205 165 150 30 30 A3143– Typ. 280 280 225 225 55 55 Max. 340 355 285 300 80 80 Min. 70 35 50 25 20 20 A3144– Typ. — — — — 55 55 Max. 350 450 330 430 — —
NOTES: Typical values are at TA = +25°C and VCC = 8 V. BOP = operate point (output turns ON); BRP = release point (output turns OFF); Bhys = hysteresis (BOP - BRP). 1 gauss (G) is exactly equal to 0.1 millitesla (mT). *Complete part number includes a suffix to identify operating temperature range (E- or L-) and package type ( -LT or -UA).
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1993, 2002 Allegro MicroSystems, Inc.
3141 THRU 3144 SENSITIVE HALL-EFFECT SWITCHES FOR HIGH-TEMP. OPERATION
TYPICAL OPERATING CHARACTERISTICS
A3142– SWITCH POINTS
400
300
OUTPUT SATURATION VOLTAGE
I OUT = 20 mA
V 300
CC
=8V
V CC = 4.5–24 V
SATURATION VOLTAGE IN mV
SWITCH POINT IN GAUSS
200
200
OPERATE POINT
100
RELEASE POINT 100
0 -50 -25 0 25 50 75 100 125 150
0 -50
-25
0
25
50
75
100
125
150
AMBIENT TEMPERATURE IN ° C
Dwg. GH-044
AMBIENT TEMPERATURE IN °C
Dwg. GH-040-1
SUPPLY CURRENT
10
7.0
SUPPLY CURRENT
8.0
B ≥ B OP
VCC = 8 V
SUPPLY CURRENT IN mA
SUPPLY CURRENT IN mA
B ≥ B OP 6.0
6.0
4.0
B ≤ B RP
5.0
2.0
T A = +25°C
4.0
B ≤ B RP
0 0 5 10 15 20 25
-50 -25 0 25 50 75 100 125 150
SUPPLY VOLTAGE IN VOLTS
Dw.