The A3517xUA and A3518xUA are sensitive, temperature-stable linear

Hall-effect sensors with greatly improved offset characteristics. Ratiometric,

linear Hall-effect sensors provide a voltage output that is proportional to the

applied magnetic field and have a quiescent output voltage that is approxi-

mately 50% of the supply voltage. These magnetic sensors are ideal for use in

linear and rotary position sensing systems in the harsh environments of

automotive and industrial applications over extended temperatures to -40

°C

and +150

°C. The A3517xUA features an output sensitivity of 5 mV/G while

the A3518xUA has an output sensitivity of 2.5 mV/G. See the Magnetic

Characteristics table for complete, individual device parametrics.

Each BiCMOS monolithic circuit integrates a Hall element, improved

temperature-compensating circuitry to reduce the intrinsic sensitivity drift of

the Hall element, a small-signal high-gain amplifier, and a rail-to-rail low-

impedance output stage.

A proprietary dynamic offset cancelation technique, with an internal high-

frequency clock, reduces the residual offset voltage, which is normally caused

by device overmolding, temperature dependancies, and thermal stress. This

technique produces devices that have an extremely stable quiescent output

voltage, are immune to mechanical stress, and have precise recoverability after

temperature cycling. Many problems normally associated with low-level

analog signals are minimized by having the Hall element and amplifier in a

single chip. Output precision is obtained by internal gain and offset trim

adjustments during the manufacturing process.

These reduced-cost devices are supplied in a 3-pin ultra-mini-SIP “UA”

package only.

FEATURES

s

Temperature-Stable Quiescent Output Voltage

s

Precise Recoverability After Temperature Cycling

s

Output Voltage Proportional to Applied Magnetic Field

s

Ratiometric Rail-to-Rail Output

s

Improved Sensitivity

s

4.5 V to 5.5 V Operation

s

Immune to Mechanical Stress

s

Small Package Size

s

Solid-State Reliability

Always order by complete part number, e.g., A3517SUA .

RATIOMETRIC, LINEAR HALL-EFFECT SENSORS

FOR HIGH-TEMPERATURE OPERATION

Dwg. PH-006

1

V

CC

3

2

Pinning is shown viewed from branded side.

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, V

Output Voltage, V

Output Sink Current, I

Magnetic Flux Density, B ......... Unlimited

Package Power Dissipation,

P

Operating Temperature Range*, T

A

Suffix S– .................... -20

Suffix L– .................... -40

Storage Temperature Range,

T

* Infrequent excursions permitted; see

Applications Information.

3518