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AH276Q 
Document number: DS31066 Rev. 6 - 2 
1 of 6
www.diodes.com
September 2013
?Diodes Incorporated 
H276Q
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
 
Description
AH276 are integrated Hall sensors with output drivers, mainly
designed for electronic commutation of brush-less DC Fan. This IC
internally includes the regulator, protecting diode, Hall plate, amplifier,
comparator, and a pair of complementary open-collector outputs (DO, 
DOB). 
 
While the magnetic flux density (B) is larger than operate point (Bop),
DO will turn on (low), and meanwhile DOB will turn off (high). Each 
output is latched until B is lower than release point (Brp), and then
DO, DOB transfer each state. 
 
For DC fan application, sometimes need to test power reverse
connection condition. Internal diode only protects chip-side but not for
coil-side. If necessary, add one external diode to block the reverse
current from coil-side.
 
Features
?    On-chip Hall sensor with two different sensitivity and hysteresis
settings for AH276
?    Built-in protecting diode only for chip reverse power connecting
?    -20癈 to +85癈 operating temperature
?    Lead Free Package: SIP-4L
?    SIP-4L: Available in Green Molding Compound (No Br, Sb)
?    Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
?    Halogen and Antimony Free. Green Device (Note 3)?/DIV>
 
 
Pin Assignments
 
276
1  2
4
3
1 : Vcc
2 : DO
3 : DOB
4 : GND
( Top View )
 
 
 
 
 
 
Applications
?    Dual-coil Brush-less DC Motor 
?    Dual-coil Brush-less DC Fan 
?    Revolution Counting 
?    Speed Measurement
 
 
Notes:
1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.
 
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporateds 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 
 
 
Brush-less DC Fan
 
 
 
 
 
 
 
 
 
?/DIV>
Green
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