These Hall-effect latches are temperature-stable and stress-resistant

sensors especially suited for electronic commutation in brushless dc

motors using multipole ring magnets. Each device includes a voltage

regulator, quadratic Hall voltage generator, temperature compensation

circuit, signal amplifier, Schmitt trigger, and an open-collector output on

a single silicon chip. The on-board regulator permits operation with

supply voltages of 4.5 volts to 18 volts. The switch output can sink

10 mA. With suitable output pull up, they can be used directly with

bipolar or MOS logic circuits.

The three package styles available provide a magnetically optimized

package for most applications. Suffix ‘LT’ is a surface-mount SOT-89/

TO-243AA package; suffixes ‘U’ and ‘UA’ feature wire leads for

through-hole mounting.

HALL-EFFECT LATCHES

Always order by complete part number, e.g.,

UGN3175LT .

See Magnetic Characteristics table for differences between devices.

FEATURES

I Symmetrical Response

I 4.5 V to 18 V Operation

I Open-Collector Output

I Reverse Battery Protection

I Activate With Small, Commercially Available Permanent Magnets

I Solid-State Reliability

I Small Size

I Superior Temperature Stability

I Resistant to Physical Stress

ABSOLUTE MAXIMUM RATINGS

Magnetic Flux Density, B . . . .

Unlimited

Operating Temperature Range,

Storage Temperature Range,

Pinning is shown viewed from branded side.

3177

Dwg. PH-003A

1

V

CC

3

2