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AH375
Document number: DS31172 Rev. 7 - 3
1 of 9
www.diodes.com
July 2017
© Diodes Incorporated
AH375
SINGLE PHASE HALL EFFECT LATCH
Description
AH375 is an integrated Hall-Effect latched sensor designed for
electronic commutation of brush-less DC motor applications. The
device includes an on-chip Hall voltage generator for magnetic
sensing, a comparator that amplifies the Hall voltage, and a Schmitt
trigger to provide switching hysteresis for noise rejection, and open
drain output. An internal band-gap regulator provides a temperature
compensated supply voltage for internal circuits and allows a wide
operating supply range.
When the magnetic flux density (B) is larger than operate point (Bop),
output is switched on (OUT pin is pulled low). The output state is held
on until a magnetic flux density reversal falls below Brp. When B is
less than Brp, the output is switched off.
The AH375 is available in SIP-3 (Ammo Pack), SIP-3 (Bulk Pack) and
SC59 packages.
Features
• Bipolar Hall-Effect Latch Sensor
• 2.2V to 20V DC Operating Voltage
• Temperature Compensation
• Open Drain Pre-Driver
• 25mA Maximum Output Sink Current
• Operating Temperature: -40C to +125C
• SIP-3 (Ammo Pack), SIP-3 (Bulk Pack) and SC59 Packages
(SC59 is Commonly Known as SOT23 in Asia)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Front View)
1.
Vdd
2.
GND
3.
OUT
SIP-3 (Bulk Pack)
1. Vdd
GND 2.
3. OUT
(Top View)
SC59
Applications
• Brush-Less DC Motor
• Brush-Less DC Fan
• Revolution Counting
• Speed Measurement
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.
Typical Applications Circuit
AH375
Output
GND
L
R
C
2
3
1
Vdd
NOT RECOMMENDED FOR NEW DESIGN
USE AH3774
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