US5781LUA Melexis Inc, US5781LUA Datasheet - Page 5

• Manufacturer Part Number: US5781LUA
• Description: IC HALL EFFECT SWITCH TO-92UA
• Manufacturer: Melexis Inc
• Type: Unipolar Switchr

Specifications of US5781LUA

• Sensing Range: 15mT Trip, 3.5mT Release
• Voltage - Supply: 3.5 V ~ 24 V
• Current - Supply: 5mA
• Current - Output (max): 50mA
• Output Type: Digital, Open Drain
• Operating Temperature: -40°C ~ 150°C
• Package / Case: TO-92UA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

9 Detailed General Description
Based on mixed signal CMOS technology, Melexis US5781 is a Hall-effect device with medium magnetic
sensitivity. Its sensitivity enables high accuracy in position sensing by the use of small air gap.
The chopper-stabilized amplifier uses switched capacitor technique to suppress the offset generally observed
with Hall sensors and amplifiers. The CMOS technology makes this advanced technique possible and
contributes to smaller chip size and lower current consumption than bipolar technology. The small chip size is
also an important factor to minimize the effect of physical stress.
This combination results in more stable magnetic characteristics and enables faster and more precise design.
The wide operating voltage from 3.5V to 24V, “L” and “E” operating temperature range and low current
consumption make this device especially suitable for automotive and solid state switch applications.
The output signal is open-drain type. Such output allows simple connectivity with TTL or CMOS logic by using
a pull-up resistor tied between a pull-up voltage and the device output.
10 Unique Features
The US5781 exhibits unipolar magnetic switching characteristics. Therefore, it operates only with one
magnetic pole.
A magnetic hysteresis B
output oscillation near the switching point.
3901005781
Rev 013
Unipolar switch characteristic
HYST
keeps B
OP
and B
The UA package is south pole active:
Applying a south magnetic pole greater than B
branded side of the package switches the output low.
The SE package is north pole active:
Applying a north magnetic pole greater than B
branded side of the package switches the output low.
Removing the magnetic field (B→0) switches the output high.
The use of the opposite magnetic pole facing the branded side
does not affect the output state.
RP
Unipolar Hall Switch – Medium Sensitivity
Page 5 of 11
separated by a minimal value. This hysteresis prevents
US5781
OP
OP
facing the
facing the
Data Sheet
Nov/06