Not to scale

The A3213 and A3214 integrated circuits are ultra-sensitive,

pole-independent Hall-effect switches with a latched digital

output. They are especially suited for operation in battery-

operated, hand-held equipment such as cell and cordless

telephones and palmtop computers. A 2.4 to 5.5 V operation

and a unique clocking scheme reduce the average operating

power requirements: the A3213 to 825 µW, the A3214 to

14 µW (typical, at 2.75 V). Except for operating duty cycle

and average operating current, the A3213 and A3214 are

identical.

Unlike other Hall-effect switches, either a north or south

pole of sufficient strength will turn the output on; in the

absence of a magnetic field, the output is off. The polarity

independence and minimal power requirement allows these

devices to easily replace reed switches for superior reliabil-

ity and ease of manufacturing, while eliminating the require-

ment for signal conditioning.

Improved stability is made possible through chopper sta-

bilization (dynamic offset cancellation), which reduces the

residual offset voltage normally caused by device overmold-

ing, temperature dependencies, and thermal stress.

27622.62-DS Rev. 27

• AEC-Q100 automotive qualified

• Micropower operation

• Operate with north or south pole

• 2.4 to 5.5 V battery operation

• Chopper stabilized

□ Superior temperature stability

□ Extremely low switchpoint drift

□ Insensitive to physical stress

• High ESD protection

• Solid-state reliability

• Small size

• Easily assembly into applications due to magnetic pole

independence

Micropower Ultra-Sensitive Hall-Effect Switches

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Packages:

Functional Block Diagram

A3213 and A3214

3 pin surface mount

SOT23-W (suffix LH)

3 lead ultramini SIP

(suffix UA)

TIMING

LOGIC

Dwg. FH-020-5

GROUND

OUTPUT

SUPPLY

X

SWITCH

FEATURES AND BENEFITS

DESCRIPTION