Reed Relays and
Electronics India Limited
Manufacturer of Reed Switches, Reed Sensors and Reed-based products
Reed Relays and Electronics India Limited Incorporated in 1971

R5B Ultra-miniature Normally Closed SMD Reed Sensor

SMD actuation R5B Ultra-miniature Normally closed SMD reed sensor drawing
SMD actuation

All dimensions in mm

Click the thumbnails on the left to view actuation distances

These ultra miniature normally closed SMD reed sensors are built with an biasing magnet. As they are molded with pre-flattened leads, no shock is transferred into the device when SMD formation takes place. Various activating distances are available depending on the magnet and the AT band used. The sensors are tested 100% for Operate AT, Release AT, Contact Resistance and Variable Contact Resistance before packing. Our products are completely Lead-free and conform to the RoHS directive.


Does not require power for operation  Normally Closed form B contact  Polarity Sensitive  Molded with internal blades parallel to SMD feet  Packed in tape and reels conforming to IEC-60286-3 norms  RoHS Compliant and Lead-free  Not Sensitive to ESD


This reed sensor is suitable for use in the following applications and in many others: telephone hook switches, fluid tank cap sensing, emergency lamps, capsule endoscopy


Contact Form B
Contact Rating (max) W/VA 5.0
Switching Current (max) A 0.35
Carry Current (max) A 0.5
DC Switching Voltage (max) VDC 100
Breakdown Voltage (min) VDC 150
Contact Resistance (max) 200
Operating Temperature °C -40 to +140
Shock Resistance (½Sin wave for 11ms) G 30
Vibration Resistance (10-2000Hz) G 20

Ordering Codes

R5B-S-(Release AT Code)

RAT Code AT Band
1 5-12
 2 10-17

Example: R5B-S-1
Denotes SMD version in 5 – 12 Release AT.

Other Special Configurations Available

Non standard lead formations
Dynamic Contact Resistance Limit
Special Release AT Limits
Gold plated leads

Possible magnet actuations


As shown in above examples, unlike poles of magnet and sensor cause the sensor to release. Like poles do not cause a release. Choosing the right AT band, magnet strength, and operating axis, will restrict the number of operates and releases to one. Click here to view actuation distances of this sensor with the standard magnets.

Recommended Reflow Profile

SMD Soldering Procedure

Tape and Reel Dimensions

The R5B-S can be tape and reel packed for automatic pick and place, as per IEC-60286-3 norms. 2500 will be packed per spool. 40 – 80g force will be required to peel off cover tape.

R5B Ultra-miniature Normally Closed SMD Reed Sensor
R5B Normally Closed (NC) SMT Reed Sensors: 6.5mm body length, polarity sensitive, complete data sheet and technical specifications.
Brand: RRE
Manufacturer: Reed Relays and Electronics
Model: R5B
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