Allegro UGN3177UA, UGN3177U, UGN3175UA, UGN3177LT, UGN3175U Datasheet
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Data Sheet
3175
AND
27609.4A
3177
HALL-EFFECT LATCHES
These Hall-effect latches are temperature-stable and stress-resistant
sensors especially suited for electronic commutation in brushless dc
motors using multipole ring magnets. Each device includes a voltage
X
V
CC
1
32
regulator, quadratic Hall voltage generator, temperature compensation
circuit, signal amplifier, Schmitt trigger, and an open-collector output on
a single silicon chip. The on-board regulator permits operation with
supply voltages of 4.5 volts to 18 volts. The switch output can sink
10 mA. With suitable output pull up, they can be used directly with
bipolar or MOS logic circuits.
The three package styles available provide a magnetically optimized
package for most applications. Suffix ‘LT’ is a surface-mount SOT-89/
TO-243AA package; suffixes ‘U’ and ‘UA’ feature wire leads for
through-hole mounting.
SUPPLY
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC. . . . . . . . . . . . . 18 V
Reverse Battery Voltage, V
Magnetic Flux Density, B . . . . Unlimited
Output OFF Voltage, V
Continuous Output Current, I
Operating Temperature Range,
TA. . . . . . . . . . . . . . . -20°C to +85°C
Storage Temperature Range,
TS. . . . . . . . . . . . . . . -65°C to +150°C
GROUND
Dwg. PH-003A
OUT
OUTPUT
. . . . -18 V
RCC
. . . . . . . . 18 V
. 15 mA
OUT
FEATURES
■ Symmetrical Response
■ 4.5 V to 18 V Operation
■ Open-Collector Output
■ Reverse Battery Protection
■ Activate With Small, Commercially Available Permanent Magnets
■ Solid-State Reliability
■ Small Size
■ Superior Temperature Stability
■ Resistant to Physical Stress
Always order by complete part number, e.g., UGN3175LT .
See Magnetic Characteristics table for differences between devices.
3175
AND
3177
HALL-EFFECT
LATCHES
1
REG.
FUNCTIONAL BLOCK DIAGRAM
V
CC
3
X
OUTPUT
GROUND
2
Dwg. FH-005-2
ELECTRICAL CHARACTERISTICS at TA = +25°C, VCC = 4.5 V to 18 V (unless otherwise noted).
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Supply Voltage V
Output Saturation Voltage V
Output Leakage Current I
Supply Current I
Output Rise Time t
Output Fall Time t
OUT(SAT)
CC
OFF
CC
r
f
Operating 4.5 — 18 V
VCC = 18 V, I
V
= 18 V, B < B
OUT
VCC = 4.5 V, B < BRP (Output OFF) — 5.0 10 mA
VCC = 12 V, RL = 1.1 kΩ, CL = 20 pF — 0.04 2.0 µs
VCC = 12 V, RL = 1.1 kΩ, CL = 20 pF — 0.18 2.0 µs
= 10 mA, B > B
OUT
RP
OP
— 200 300 mV
— 0.05 5.0 µA
MAGNETIC CHARACTERISTICS in gauss; VCC = 4.5 V to 18 V.
Part
Characteristic Min. Typ. Max. Min. Typ. Max.
Operate Point, B
Release Point, B
Hysteresis, B
OP
RP
hys
Number*
UGN3175 25 — 170 15 — 180
UGN3177 50 — 150 25 — 150
UGN3175 -170 — -25 -180 — -15
UGN3177 -150 — -50 -150 — -25
UGN3175 100 200 — 80 180 —
UGN3177 100 200 — 50 180 —
TA = +25°CT
= -20°C to +85°C
A
NOTE: As used here, negative flux densities are defined as less than zero (algebraic convention).
Complete part number includes a suffix denoting package type (LT, U, or UA).
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1991, 1999, Allegro MicroSystems, Inc.
3175
AND
3177
HALL-EFFECT
LATCHES
SENSOR LOCATIONS
(±0.005” [0.13mm] die placement)
Suffix “LT”
ACTIVE AREA DEPTH
0.030"
0.76 mm
NOM
0.090"
2.30 mm
A
1 32
Suffix “U”
ACTIVE AREA DEPTH
0.015"
0.38 mm
NOM
0.092"
2.35 mm
0.045"
1.15 mm
Dwg. MH-008-1B
0.072"
1.83 mm
TYPICAL OPERATING CHARACTERISTICS
200
100
0
-100
SWITCH POINT IN GAUSS
-200
-30
OPERATE POINT
RELEASE POINT
-10 10 30 50
AMBIENT TEMPERATURE IN °C
V = 14 V
CC
70
Dwg. GH-020
90
BRANDED
SURFACE
Suffix “UA”
ACTIVE AREA DEPTH
0.018"
0.46 mm
NOM
BRANDED
SURFACE
A
1 32
A
1 32
Dwg. MH-002-3B
0.083"
2.12 mm
0.055"
1.39 mm
Dwg. MH-011B
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