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

R2B, Normally Closed, SMD Reed Sensor

R2B actuation distance R2B-S Normally closed SMD reed sensor drawing
R2B actuation distance

Click the thumbnails on the left to view actuation distances


Does not require power for operation  Normally Closed form B contact  Sputtered Ruthenium contact  Polarity Sensitive  Two types of lead configurations  Three magnetic sensitivity bands  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


These Normally Closed SMD reed sensors are built with an inbuilt 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 release and operate AT, Static Contact Resistance and Variable Contact Resistance before packing. Our products are completely Lead-free and conform to the RoHS directive.


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


Contact Form B
Contact Rating (max) W/VA 10.0
Switching Current (max) A 0.5
Carry Current (max) A 1.5
DC Switching Voltage (max) VDC 180
Breakdown Voltage (min) VDC 200
Contact Resistance (max) 150
Operating Temperature °C -20 to +100
Shock Resistance (½Sin wave for 11ms) G 30
Vibration Resistance (10-2000Hz) G 20

Ordering Codes

R2B-S-(Release AT Code)

RAT Code AT Band
1 10-15
2 15-20

Please contact us for Re-closure values
Example: R2B-S-2
Denotes Gull-wing version in 15-20 Release AT.

Other Special Configurations Available

Non standard lead formations
Special Operate AT Limits
Gold plated leads

Possible magnet actuations

Normally Closed Reed Sensor Actuation Examples

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 R2B-S and the R2B-F can be tape and reel packed for automatic pick and place, as per IEC-60286-3 norms. 2000 will be packed per spool. 40 – 80g force will be required to peel off cover tape.

R2B Normally Closed Magnetic Reed Sensor Tape and Reel Drawing

R2B, Normally Closed, SMD Reed Sensor
R2B Normally Closed (NC) SMT Reed Sensors: 19.5 mm pitch gull wing, polarity sensitive, complete data sheet and technical specifications.
Brand: RRE
Manufacturer: Reed Relays and Electronics
Model: R2B
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