Diodes AH337 User Manual
Ah337, Single phase hall effect switch, Description
AH337
SINGLE PHASE HALL EFFECT SWITCH
AH337
Document number: DS31050 Rev. 9 - 2
1 of 9
July 2010
© Diodes Incorporated
Description
AH337 is an 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-3L 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: -40
°C to +125°C
• SIP-3L and SC59 packages
(SC59 is commonly known as SOT23 in Asia)
• Green Molding Compound (No Br, Sb) (Note 1)
Pin Assignments
(Top View)
1. Vdd
2. GND
3. OUT
SIP-3L
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. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
Typical Application Circuit
AH337
4.2V ~ 28 V
Output
Vdd
GND
L
R