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

R2E Latching / Bi-stable SMD Reed Sensors

  • R2E-S Latching Reed Sensor Drawing
  • Drawing of R2-S Reed Sensor Pad Layout
  • R2E-F Latching SMD Reed Sensor Drawing
  • Drawing of R2-F Reed Sensor Pad Layout
  • R2E Latching Reed Sensor Carrier Tape Drawing


10W Contact Rating. Bi-stable, Lacthing contact. Polarity Sensitive. Packed in Tapes for automatic assembly. Two Lead Formations.



Does not require power for operation. Sputtered Ruthenium Contact. RoHS Compliant. Not ESD Sensitive.


These bi-stable 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 latching/unlatching distances are available depending on the magnet used. The sensors are tested 100% for Operate AT, Release ATStatic 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 Drawing of Cylindrical MagnetsDrawing of Rectangular Bar Magnets starFeaturesNdFeB High Energy. Nickel coated. Energized Continue reading ->

Nov 18, 2020

Actuation Distances for R2E Latching Reed Sensors

R2E magnet actuation Operate and release distances for the R2E Latching type reed sensor in the two standard AT bands when actuated with NdFeB standard magnets Continue reading ->

Oct 30, 2020


Contact FormB
Contact Rating (max)W/VA10.0
Switching Current (max)A0.5
Carry Current (max)A1.0
DC Switching Voltage (max)VDC100
Breakdown Voltage (min)VDC150
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

R2E-(Formation Code)-(Operate AT Code)

Formation CodeLead Type
SGull-wing SMD
FLow Profile SMD
Latch/Unlatch Band Code

Examples: R2E-S-2 denotes R2E Reed Sensor with Gull-wing SMD formed leads, in 15-20 Latch/Unlatch Band (AT). R2E-F-1 denotes R2E Reed Sensor with Low profile SMD formed leads, in 10-15 Latch/Unlatch Band (AT).

Other Special Configurations: Lower Static Contact Resistance, 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 magnetic sensitivity of a Reed Switch, Reed Sensor or Continue reading ->

Aug 27, 2020

Product Handling

Dropping Reed switch Reed Switch Handling Reed Switches, Reed Sensor and Magnet Sensors are sensitive devices that easily develop micro cracks in the glass Continue reading ->

Aug 31, 2020

Reflow Soldering

Drawing of SMD reflow soldering curve Reflow Soldering is a process of automatically soldering multiple devices on a PCB. This is usually done after components are Continue reading ->

Aug 28, 2020

Manual Soldering

Soldered Reed switch Soldering of Reed Switches and Reed Sensors requires some care to ensure that these delicate devices are not inadvertently damaged. Damage Continue reading ->

Nov 10, 2020

Ferro-magnetic parts

Ferromagnetic parts Reed Switches use an alloy of Nickel and Iron with a few other elements that make the alloy Ferro-magnetic and having a low Remanence. Continue reading ->

Sep 4, 2019

Reed Contact Protection Circuits

Inductive Load Protection Circuit It is assumed that the ideal reed switch load is a Resistive Load, but it is almost impossible to reduce any load to purely resistive. Continue reading ->

Aug 31, 2020


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 R2E Normally Closed Reed Sensor is known to perform well.

Reed switches in Floor detection in Elevators and Lifts

Reed switches in floor detection in lifts Elevator Most people are aware of Elevators, or lifts, as they are called in certain areas of the world. The electrical motors in Continue reading ->

Nov 7, 2020

Reed sensors in Accurate level sensing of fluids

Reed switches in fluid level sensing Fuel Gauge In ships and yachts, it is not only necessary to monitor the exact volume of fuel, but also the volume of the sewage and the Continue reading ->

Nov 7, 2020

R2E Latching / Bi-stable SMD Reed Sensors
R2E Bistable SMT reed switches: 19.5 mm pitch gull wing, 10W, polarity sensitive, complete data sheet and technical specifications.
Brand: RRE
Manufacturer: Reed Relays and Electronics
Model: R2E
3.9 based on 4 reviews