AH172
Internal Pull-up Hall Effect Latch


This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev. 0.4 May 7, 2004
1/6

„ Features

- Bipolar Hall effect latch sensor
- 3.0V to 20V DC operation voltage
- Built-in pull-up resistor
- 25mA output sink current
- Operating temperature: -20°C to 85°C
- Package: SIP3, SOT23

„ Applications

- Rotor position sensing
- Current switch
- Encoder
- RPM detection



„ Pin Assignments

(SIP3 package)
( SOT23 package)
1. VCC
2. GND
3.
OUT
1. VCC
3.
GND 2.
(Top view)
OUT

„ General Description

AH172 is a single digital output Hall-effect sensor
with pull-up resistor for high temperature operation.
The device includes an on-chip Hall voltage
generator for magnetic sensing, an amplifier to
amplify Hall voltage, and a comparator to provide
switching hysteresis for noise rejection, and an
output driver with a pull-up resistor (Rpu). An
internal bandgap regulator is used to provide
temperature compensated supply voltage for
internal circuits and allows a wide operating supply
range. While the magnetic flux density (B) is larger
than operate point (Bop), the OUT pin turns on
(low). If B removed toward release point (Brp), the
OUT pin is latched “on” state prior to B < Brp. When
B < Brp, the OUT pin go into “ off ” state.


„ Pin Descriptions


Name Description
VCC Positive power supply
GND Ground
OUT Output stage

„ Ordering Information


AH172 X -XX X -X
Packing
Blank : Tube or Bulk
A : Tape & Reel
P: SIP3
W: SOT23
Package Lead
L : Lead Free
Blank: Normal
Wafer Body
Magnetic
Characteristics
Blank or
A~Z : if necessary
to specify
A or B