SS2509LSOT datasheet(4/8 Pages) SECELECTRONICS

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SS2509

Hall Latch - High Sensitivity

V3.10

Nov 1, 2013

Output Behavior versus Magnetic Pole

DC Operating Parameters TA = -40°C to 150°C, VDD = 3.5 to 24V (unless otherwise specified)

Test Conditions (UA)

Test Conditions (SO)

OUT

B < BRP

B > BRP

High

B > BOP

B < BOP

Low

The SOT-23 device is reversed from the UA package. The SOT-23 output transistor will be turned on(drops low) in the presence of a

sufficiently strong North pole magnetic field applied to the marked face and turned off(hoists high) in the presence of a sufficiently

strong South pole magnetic field.

Detailed General Description

The SS2509 exhibits latch magnetic switching characteristics. Therefore, it requires both south and north poles to

operate properly.

The OUT pin of these devices switches low (turns on) when a magnetic field perpendicular to the Hall sensor ex-

ceeds the operate point threshold, BOP. After turn-on, the output voltage is VDSon. Note that the device latches, that

is, a south pole of sufficient strength towards the branded surface of the device turns the device on. The device re-

mains on if the south pole is removed (B

→0). This latching property defines the device as a magnetic memory.

When the magnetic field is reduced below the release point, BRP, the OUT pin turns off (goes high). The difference

in the magnetic operating and release points is the hysteresis, BHYST, of the device. This built-in hysteresis prevents

output oscillation near the switching point, and allows clean switching of the output even in the presence of exter-

nal mechanical vibration and electrical noise.

The device behaves as a latch with symmetric operating and release switching points (BOP=|BRP|). This means

magnetic fields with equivalent strength and opposite direction drive the output high and low.

Powering-on the device in the hysteresis region (less than BOP and higher than BRP) allows an indeterminate output

0mT

Output level

OUT = High

Flux density

OUT = High

BOP

23Gs typ

OUT = Low

UA package - Latch characteristic

BOP

23Gs typ

BRP

-23Gs typ

BRP

-23Gs typ

Flux density

SO package - Latch characteristic

BHYST

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