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-S NC Reed Sensor Drawing
  • Drawing of R2-S Reed Sensor Pad Layout
  • R2B-F NC Reed Sensor Drawing
  • Drawing of R2-F Reed Sensor Pad Layout
  • R2B NC Reed Sensor Carrier Tape Drawing


10W Contact Rating. Normally Closed contact. Polarity Sensitive. Two sensitivity bands. Two Lead formations.



Does not require power for operation. Sputtered Ruthenium Contact. Not ESD Sensitive. Packed in Tapes for automatic assembly.


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. Opposing poles of magnet and sensor cause this normally closed sensor contact 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. All dimensions are in mm.

Cylindrical and Rectangular Magnets

Standard magnets-RRE We offer a range of magnets in different sizes and shapes, specially selected to...Continue reading ->

Actuation Distances for R2B NC Reed Sensors

Standard Size Biased Reed Sensor Release, operate and re-closure distances for the R2B-S Normally Closed SMD reed sensor in...Continue reading ->


Contact FormB
Contact Rating (max)W/VA10.0
Switching Current (max)A0.5
Carry Current (max)A1.50
DC Switching Voltage (max)VDC180
Breakdown Voltage (min)VDC200
Contact Resistance (max)150
Insulation Resistance (min)Ω109
Capacitance (typ)pF0.2


Operate Time (max)ms0.35
Bounce Time (max)ms0.15
Release Time (max)ms0.15
Resonance Frequency (typ)Hz>2000
Operating Frequency (max)Hz500
Operating Temperature Range°C-40 to +140
Shock Resistance (½Sin wave for 11ms)G30
Vibration Resistance (10-2000 Hz)G20

Ordering Code

R2B-(Formation Code)-(Release Band Code)

Formation CodeLead Type
SGull-wing SMD
FLow Profile SMD
Release Band Code

Examples: R2B-S-2 denotes R2B Reed Sensor with Gull-wing SMD formed leads, in 15-20 Release Band (AT). R2B-F-1 denotes R2B Reed Sensor with Low profile SMD formed leads, in 10-15 Release Band (AT).

Other Special Configurations: Lower Static Contact Resistance, Dynamic Contact Resistance Limit, Higher Insulation Resistance, Special Release Limits, Gold plated leads.

Usage Notes

Here are some of the recommended usage notes to ensure maximum durability of this product. The complete usage notes are available here.

Ampere Turn Selection

Reed Sensor Manufacturer Cross Reference For any application, it is important to select the correct Ampere Turn (AT) or...Continue reading ->

Product Handling

Dropping Reed switch Reed Switches, Reed Sensor and Magnet Sensors are sensitive devices that easily develop micro...Continue reading ->

Reflow Soldering

Drawing of SMD reflow soldering curve Reflow Soldering is the process of automatically soldering multiple devices to a PCB. Continue...Continue reading ->

Manual Soldering

Soldered Reed switch Manual Soldering of reed switch leads may be required when using custom plastic housing...Continue reading ->

Ferro-magnetic parts

Ferromagnetic parts Using Ferro-magnetic mounting parts or screws within a 100 mm vicinity of a reed switch will...Continue reading ->

Reed Contact Protection Circuits

Inductive Load Protection Circuit When a reed switch is to be connected to an inductive load or a...Continue reading ->


Although we can never restrict the use of a reed sensor to a particular field, the following is a list of some of the applications that the R2B Normally Closed Reed Sensor is known to perform well.

Reed Sensors in In-road Warning Lights

In-road Warning Lights In-road warning lights with biased Reed Sensors are de-activate with a low cost external...Continue reading ->

Reed switches in Safety Vane applications

conveyor belt Optic sensor lenses need to be exceptionally clean for vane sensing applications. A reed...Continue reading ->

Reed sensors in Emergency lamp holders

Reed switches in emergency lamp When emergency lamps are taken off their holders, a buzzer should sound. The lamp...Continue reading ->

Reed sensors in Survival rafts and ELTs

Reed switches in survival rafts Survival rafts contain water sensors which trigger the compressed air cylinder to inflate the...Continue reading ->

Reed sensors used in Fuel cap position sensing

Automobile Fuel cap Driver information. Instrument panel dashboards need to show more and more information for the...Continue reading ->

Reed sensors in Telephone Handsets

Reed switches in telephone hook switches Conventional hook switches which are used in telephone handsets undergo millions of operations and...Continue reading ->
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
4.1 based on 4 reviews