littelfuse.com© 2015 Littelfuse Revised: 10/16/15
Specifications are subject to change without notice.
55505 Hall Effect Flange Mount Geartooth Speed Sensor
Description
The 55505 is a robust flange mounting hall effect sensor primarily for geartooth
speed sensing. Protected against severe and automotive environments. It is
capable of switching up to 27Vdc and 20mA and available as three-wire (voltage
output) version. It’s case design encorporates brass mounting bush. It is ideally
suited to wheel, transmission and camshaft speed sensing, geartooth sensor,
rotary encoders, industrial, commercial, and automotive applications.
Hall Effect Sensors
Features
• Ferrous target speed sensing
• Internal circuit protection
• Protection against severe and
automotive environments
• Self adjusting magnetic range
• Automotive grade circuit protection
• High speed operation
• Short circuit and reverse voltage
protection
• On board 10-bit A/D convertor
Benefits
• No chopper delay
• Immune to target run out
• Rotational alignment to target
not critical
Applications
• Wheel, transmission and
camshaft speed sensing
• Geartooth sensor
• Rotary encoders
• Industrial
• Commercial
• Automotive
Dimensions
Dimensions in mm (inch)
Application Example (Geartooth Sensor)
Block Diagram
Flange Mount Geartooth > 55505
(1.630)
31.75
(1.250)
5.00
(.197)
6.35 NOM.
(.250)
300
(11.81)
22.00
(.866)
Ø6.60
(.260)
Ø23.80
(.937)
(1.250)
5.00
(.197)
6.35 NOM.
(.250)
300
(11.81)
22.00
(.866)
Ø6.60
(.260)
Ø23.80
(.937)
Ø17.86
(.703)
VDD
Pin 3
(Red)
Hall
Plate
Switch Output
Clock
Comparator
R1
C1
C2
Rpu
GND
Pin 1
(Black)
OUT
Pin 2
(White with
Black Stripe)
Typical Output
2mm
(.078) Max.
