3175
AND
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
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.
Data Sheet
27609.4A
V
X
CC
1
2
3
GROUND
OUTPUT
SUPPLY
FEATURES
I
Symmetrical Response
I
4.5 V to 18 V Operation
I
Open-Collector Output
I
Reverse Battery Protection
I
Activate With Small, Commercially Available Permanent Magnets
I
Solid-State Reliability
I
Small Size
I
Superior Temperature Stability
I
Resistant to Physical Stress
Dwg. PH-003A
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
. . . . . . . . . . . . .
18 V
Reverse Battery Voltage, V
RCC
. . . .
-18 V
Magnetic Flux Density, B . . . .
Unlimited
Output OFF Voltage, V
OUT
. . . . . . . .
18 V
Continuous Output Current, I
OUT
.
15 mA
Operating Temperature Range,
T
A
. . . . . . . . . . . . . . .
-20
°
C to +85
°
C
Storage Temperature Range,
T
S
. . . . . . . . . . . . . . .
-65
°
C to +150
°
C
Always order by complete part number, e.g.,
UGN3175LT
.
See Magnetic Characteristics table for differences between devices.
3175
AND
3177
HALL-EFFECT
LATCHES
FUNCTIONAL BLOCK DIAGRAM
1
V
CC
REG.
X
3
OUTPUT
GROUND
2
Dwg. FH-005-2
ELECTRICAL CHARACTERISTICS at T
A
= +25
°
C, V
CC
= 4.5 V to 18 V (unless otherwise noted).
Limits
Characteristic
Supply Voltage
Output Saturation Voltage
Output Leakage Current
Supply Current
Output Rise Time
Output Fall Time
Symbol
V
CC
V
OUT(SAT)
I
OFF
I
CC
t
r
t
f
Test Conditions
Operating
V
CC
= 18 V, I
OUT
= 10 mA, B > B
OP
V
OUT
= 18 V, B < B
RP
V
CC
= 4.5 V, B < B
RP
(Output OFF)
V
CC
= 12 V, R
L
= 1.1 kΩ, C
L
= 20 pF
V
CC
= 12 V, R
L
= 1.1 kΩ, C
L
= 20 pF
Min.
4.5
—
—
—
—
—
Typ.
—
200
0.05
5.0
0.04
0.18
Max.
18
300
5.0
10
2.0
2.0
Units
V
mV
µA
mA
µs
µs
MAGNETIC CHARACTERISTICS in gauss; V
CC
= 4.5 V to 18 V.
Characteristic
Operate Point, B
OP
Part
Number*
UGN3175
UGN3177
Release Point, B
RP
UGN3175
UGN3177
Hysteresis, B
hys
UGN3175
UGN3177
T
A
= +25
°
C
Min.
25
50
-170
-150
100
100
Typ.
—
—
—
—
200
200
Max.
170
150
-25
-50
—
—
Min.
15
25
-180
-150
80
50
T
A
= -20
°
C to +85
°
C
Typ.
—
—
—
—
180
180
Max.
180
150
-15
-25
—
—
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
PACKAGE DESIGNATOR ‘U’
Dimensions in Inches
(controlling dimensions)
0.183
0.178
0.063
0.059
Dimensions in Millimeters
(for reference only)
4.65
4.52
1.60
1.50
0.181
0.176
45°
0.086
MAX
4.60
4.47
45°
2.18
MAX
1
2
3
0.018
1
2
3
0.46
0.600
0.560
0.016
SEE NOTE
0.015
15.24
14.23
0.41
SEE NOTE
0.38
0.050
0.100
Dwg. MH-003D in
1.27
2.54
Dwg. MH-003D mm
Devices in the ‘U’ package are
NOT RECOMMENDED FOR NEW DESIGN
NOTES: 1. Tolerances on package height and width represent allowable mold offsets. Dimensions given are
measured at the widest point (parting line).
2. Exact body and lead configuration at vendor’s option within limits shown.
3. Height does not include mold gate flash.
4. Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm).
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