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AH337
Document number: DS31050 Rev. 10 - 3
1 of 9
www.diodes.com
January 2018
© Diodes Incorporated
AH337
SINGLE PHASE HALL EFFECT SWITCH
Description
AH337 is a unipolar Hall-Effect sensor for contactless switching
applications. The device includes an on-chip Hall voltage generator
for magnetic sensing, an amplifier that amplifies the Hall voltage, a
Schmitt trigger to provide switching hysteresis for noise rejection, and
an open-collector output. The band-gap regulator allows a wide
operating voltage 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 falls below Brp. When B is less than
Brp, the output is switched off.
The AH337 is available in SIP-3 (Ammo Pack), SIP-3 (Bulk Pack) and
SC59 packages.
Features
• Unipolar Hall-Effect Sensor
• 4.2V to 28V 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
(Top View)
1.
Vdd
2.
GND
3.
OUT
SIP-3
1. Vdd
GND 2.
3. OUT
(Top View)
SC59
Applications
• VCD/DVD Loader, CD/DVD ROM
• Cover Detector
• Speed Measurement
• Home Appliances
• Home Safety
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.
Typical Applications Circuit
AH337
4.2V ~28V
Output
Vdd
GND
L
R
NOT RECOMMENDED FOR NEW DESIGN
USE AH3377
SIP-3 (Bulk Pack)
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