NOT RECOMMENDED FOR NEW DESIGN
USE AH9247
AH9249
HIGH SENSITIVITY MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH
Description
The AH9249 is an ultra-sensitive Hall-effect switch with digital latched
output, mainly designed for battery-operation, hand-held equipments.
Special CMOS process is used for low-voltage and low-power
requirement. A chopper stabilized amplifier improves stability of
magnetic switch points. A sleep-awake logic controls the IC in sleep
time or awake time. This function will reduce the average operating
current of the IC. During the awake time, the output is changed with
the magnetic flux density. During the sleep time, the output is latched
in its previous state and the current consumption will reduce to some
μA.
The IC switching behaviour is omnipolar, either north or south pole
sufficient strength will turn the output on. If the magnetic flux density
is larger than operating point(BOP), the output will be turned on; if it is
less than releasing point(BRP), the output will be turned off.
The AH9249 is available in TO-92S-3, SOT-23-3 and DFN-2×2-3
packages which are optimized for most applications.
Pin Assignments
(Front View)
3
2
1
TO-92S-3
(Top View)
Pin 1 Mark
GND 3
2 OUTPUT
VCC 1
1 VCC
OUTPUT 2
OUTPUT
GND
VCC
3 GND
Features
SOT-23-3
DFN-2×2-3
Micropower Operation
2.5V to 5.5V Power Supply
Switching for Both Poles of a Magnet (Omnipolar)
Stabilized Chopper
Superior Temperature Stability
Digital Output Signal
Built-in Pull-up Resistor
ESD Rating: 4000V (Human Body Model)
600V (Machine Model)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Cover Switch in Notebook PC/PDA
Handheld Wireless Application Awake Switch
Magnet Switch in Low Duty Cycle Applications
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
100pF
AH9249
Document number: DS39689 Rev. 2 - 3
21
OUTPUT
VCC
AH9249
10nF
GND
3
1 of 14
www.diodes.com
2.5V to 5.5V
April 2017
© Diodes Incorporated
