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AH1808

Document number: DS35655 Rev. 4 - 2

1 of 9

www.diodes.com

February 2014

H1808

HIGH SENSITIVITY MICROPOWER OMNIPOLAR HALL-EFFECT SWITCH

Description

The AH1808 is a high sensitivity, micro power Omnipolar Hall Effect

switch IC designed for portable and battery powered consumer

equipment such as cellular phones, PDA’s and portable PC’s to home

appliance and industrial applications. 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 has been

optimized to operate over the supply range of 2.5V to 5.5V and

consumes only 24µW with a supply of 3V.

The single open drain output can switched on with either a North or

South pole of sufficient strength. When the magnetic flux density (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

• 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

 Superior Temperature Stability

 Minimal Switch Point Drift

 Enhanced Immunity to Stress

• Good RF Noise Immunity

• -40°C to +85°C Operating Temperature

• ESD (HBM) > 6KV

• Small Low Profile SOT553 and Industry Standard SC59 Packages

• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

• Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

TOP View)

SC59

(TOP View)

SOT553

Applications

• Cover Switch in Clam-Shell or Slide Type Cellular Phones

• Display Switch for Portable PCs

• On/Off Switch for PDAs and Digital Cameras

• Contact-Less Switch in Consumer Products

• Smart E-meters

• Position, Proximity and Level Detection Contact-Less Switch in

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 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.

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