littelfuse.com© 2017 Littelfuse Revised: 02/16/17
Specifications are subject to change without notice.
55140 Miniature Flange Mounting Sensor
Description
The 55140 is a small flange mounting hall effect sensor occupying only 3.22cm²
(0.500”² ) board space with a choice of digital, or programmable analogue
outputs. It is available as three-wire (voltage output) or two-wire (current output)
versions. It’s case design enables screw or adhesive mounting and capable of
switching up to 28Vdc and 20mA. It comes with a range of sensitivity, cable
length and connector options.
Hall Effect Sensors
Features
• Magnetically operated position
sensor
• Digital,latching or programmable
analog types available
• Medium, high or programmable
sensitivities
• Three-wire (voltage output) or two-
wire (current output) versions
• Vibration 50g max. @ 50-2,000Hz
• Shock 150g max. @ 11ms ½ Sine
• EMC to DIN 40839 (Consult
Littelfuse)
• Reverse/Over voltage protection
• Built in temperature compensation
• Open Drain Output
Benefits
• High switching speed up to 10kHz
• Long life; up to 20 billion operations
• Operates in static or dynamic
magnetic field
• Unaffected by harsh environment
• Customer selection of cable length
and connector type
Applications
• Position and limit sensing
• RPM measurement
• Commutation of brushless
DC motors
• Flow metering
• Angle sensing
• Magnetic encoders
Dimensions
Dimensions in mm (inch)
Block Diagram
Flange Mount > 55140
Notes:
1. Add capacitor Cn as shown, close for the sensors for transient suppression if required.
2. Add pull-up resistor Rpu as shown for sinking output. The Rpu value should be calculated
using your supply voltage while keeping the ON state current at a level below the
maximum. Rpu = VDD/Io;
Rpu = 12Vdc/10mA = 1.2
23.00
(.906)
9.50
(.374)
Encapsulant excluded
300
(11.81)
(.250)
14.00
(.551)
11.00
(.433)
General Tol.: ±(.005) 0.13
3.20x3.81 TYP.
Slot (.12x.150)
Centre of Sensitivity
6.00
(.236)
3.00
(.118)
14.00
(.551)
7.50
(.295)
Two-wire version illustrated.
VDD
Pin 1
(Red)
Hall
Plate
Clock
Comparator
Cn
GND
Pin 2
(Black)
Switch
Current
Source
VDD
Pin 1
(Red)
Hall
Plate
Clock
Comparator
Cn
Rpu
VDD
OUT
Pin 3
(Blue)
GND
Pin 2
(Black)
Switch Output
