AH1808
HIGH SENSITIVITY MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH
Description Pin Assignments
The AH1808 is a high-sensitivity, micropower Omnipolar Hall Effect
switch IC. It is designed for portable and battery powered consumer
TOP View)
equipment, home appliances and industrial equipment such as smart-
meter magnetic-tamper detection. Based on two sensitive Hall effect
plates and a chopper stabilized architecture, the AH1808 provides a
reliable solution over the whole operating range. To support portable
and battery powered equipment, the design is optimized to operate
over the supply range of 2.5V to 5.5V and consumes only 24W with
a supply of 3V.
SC59
The single open drain output can be switched on with either a North
or South pole of sufficient strength. When the magnetic flux density
(TOP View)
(B) perpendicular to the package is larger than operate point (Bop),
the output is switched on (pulled low). The output is turned off when
B becomes lower than the release point (Brp). The output will remain
off when there is no magnetic field.
Features
SOT553
Omnipolar (North or South pole) Operation
High Sensitivity
Single Open Drain Output
Micropower Operation
2.5V to 5.5V Operating Range
Chopper Stabilized Design Provides
SIP-3
Superior Temperature Stability
Minimal Switch Point Drift
Enhanced Immunity to Stress
Applications
Good RF Noise Immunity
-40C to +85C Operating Temperature
Doors, Lids, Covers and Trays Position Detect Switches
ESD (HBM) > 6KV
Display Switch for Portable PCs and Tablets
Small Low Profile SOT553 and Industry Standard SC59 and SIP-3
On/Off Switch for PDAs and Digital Cameras
Packages
Liquid Level Detection for Coffee Machines
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Smart Meters
Halogen and Antimony Free. Green Device (Note 3)
Position, Proximity and Level Detection Contact-Less Switch in
Battery Powered Consumer, Home Appliances and Industrial
Applications
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See
AH1808
Typical Applications Circuit
Note: 4. C is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 10nF to 100nF.
IN
R is the pull-up resistor, the recommended resistance is 10k to 100k.
L
Pin Descriptions
Package: SC59 and SIP-3
Pin Pin
Function
Number
Name
1 Power Supply Input
V
DD
2 GND Ground
3 OUTPUT Output
Package: SOT553
Pin
Pin
Function
Number Name
1 NC No Connection (Note 5)
2 GND Ground
3 NC No Connection (Note 5)
4 V Power Supply Input
DD
5 OUTPUT Output
Note: 5. NC is No Connection pin and is not connected internally. This pin can be left open or tied to ground.
Functional Block Diagram
2 of 12
February 2015
AH1808
Diodes Incorporated
www.diodes.com
Document number: DS35655 Rev. 6 - 2