AH3712
HIGH-VOLTAGE, HIGH-SENSITIVITY HALL EFFECT LATCH
Description
Pin Assignments
The AH3712 is a high-voltage, high-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 a wide range
of demanding applications, the design is optimized to operate over a
3.0V to 27V supply range. With chopper-stabilized architecture and
an internal bandgap regulator to provide temperature-compensated
supply for internal circuits, the AH3712 provides a reliable solution
over the whole operating range. The output also has an overcurrent
limit.
(Top View)
3 OUTPUT
GND 2
1 VDD
SC59 and SOT23 (Type S)
(Top View)
The single open-drain output can be switched on with a South pole of
sufficient strength and switched off with a 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 and latched until magnetic-flux
density reverses and becomes lower than the release point (BRP).
3. OUTPUT
2. GND
VDD
1.
SIP-3
Applications
Features
Brushless DC motor commutation
Revolutions per minute (RPM) measurements
Flow meters
Bipolar Latch
.
.
AH3712/AH3712A: South Pole On, North Pole Off
AH3712B: South Pole Off, North Pole On
Angular and linear encoders and position sensors
3.0V to 27V Operating Voltage Range
Load Dump Voltage Up to 40V
Contactless commutation, speed measurements, and angular
position sensing/indexing in consumer home appliances, office
equipment, and industrial applications
High Sensitivity: BOP and BRP of ±25G Typical
Resistant to Physical Stress
Single Open-Drain (AH3712, AH3712B) or
Internal Pull-Up Resistor (AH3712A)
Output Polarity:
.
.
Direct: AH3712, AH3712A
Inverted: AH3712B (*Future product)
Output with Overcurrent Limit
Chopper-Stabilized Design Provides
.
.
.
Superior Temperature Stability
Minimal Switch-Point Drift
Enhanced Immunity to Stress
Good RF Noise Immunity
-40C to +125°C Operating Temperature
ESD HBM: 8kV, CDM: 1kV
Industry-Standard SC59, SOT23 (Type S), and SIP-3 Packages
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
An automotive-compliant part is available under separate
datasheet (AH3712Q)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ 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
April 2023
AH3712
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Document number: DS44464 Rev. 3 - 2