AH3775
HIGH-VOLTAGE MEDIUM-SENSITIVITY HALL EFFECT LATCH
Description
Pin Assignments
The AH3775 is a high-voltage medium-sensitivity Hall Effect latch IC
designed for commutation of brushless DC motors, flow meters,
linear encoders and position sensors in industrial and consumer
home appliances and personal care applications. To support wide
range of demanding applications, the design is optimized to operate
over the supply range of 3.0V to 28V. With chopper stabilized
architecture and an internal bandgap regulator to provide
temperature compensated supply for internal circuits, the AH3775
provides a reliable solution over the whole operating range. For
robustness and protection, the device has a reverse blocking diode
with a Zener clamp on the supply. The output has an overcurrent limit
and a Zener clamp.
(Top View)
3 OUTPUT
1 VDD
GND 2
SC59 and SOT23
The single, open drain output can be switched on with South pole of
sufficient strength and switched off with North pole of sufficient
strength. When the magnetic flux density (B) perpendicular to the
package is larger than the operate point (BOP) the output is switched
on (pulled low). The output is held latched until magnetic flux density
reverses and becomes lower than the release point (BRP).
(Top View)
3. OUTPUT
2. GND
VDD
1.
The magnetic operating and release polarity is opposite for SOT23
and SC59 packages. SOT23 and SIP-3 packages will require south
pole to the part marking side to operate while SC59 will require south
pole to the non-part marking side.
SIP-3
Features
Applications
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Bipolar Latch Operation (South Pole: On, North Pole: off)
3.0V to 28V Operating Voltage Range
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Brushless DC Motor Commutation
Revolution Per Minute (RPM) Measurement
Flow Meters
Medium Sensitivity: BOP and BRP of +70G and -70G Typical
Single, Open-Drain Output with Overcurrent Limit
Chopper Stabilized Design Provides:
Angular and Linear Encoder and Position Sensors
Contactless Commutation, Speed Measurement and Angular
Position Sensing/Indexing in Consumer Home Appliances, Office
Equipments and Industrial Applications
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Superior Temperature Stability
Minimal Switch Point Drift
Enhanced Immunity to Stress
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Good RF Noise Immunity
Reverse Blocking Diode and Zener Clamp on Supply
-40C to +125C Operating Temperature
ESD (HBM): 6kV
Industry Standard SC59, SOT23 and SIP-3 Packages
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
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www.diodes.com
September 2015
© Diodes Incorporated
AH3775
Document number: DS37900 Rev. 1 - 2