R2E Latching / Bi-stable SMD Reed Sensors
Drawing of R2E-S Latching SMD Reed Sensor 
R2E-S Gull-wing SMD Formed Reed Sensor Pad Layout 
Drawing of R2E-F Latching SMD Reed Sensor Drawing 
R2E-F Low Profile SMD Formed Reed Sensor Pad Layout 
Drawing of R2E Reed Sensor Carrier Tape
Features
10W Contact Rating. Bi-stable, Lacthing contact. Polarity Sensitive. Packed in Tapes for automatic assembly. Two Lead Formations.
Description
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 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.
Standard Magnets
 | We offer a range of magnets in different sizes and shapes, specially selected to...Continue reading |
Actuation Distances for R2E Latching Reed Sensors
 | Actuation distances (latch and un-latch) for the R2E-S bi-stable SMD reed sensor when actuated...Continue reading |
Electrical
| Contact Form | B | |
| Contact Rating (max) | W/VA | 10.0 |
| Switching Current (max) | A | 0.5 |
| Carry Current (max) | A | 1.0 |
| DC Switching Voltage (max) | VDC | 100 |
| Breakdown Voltage (min) | VDC | 150 |
| Contact Resistance (max) | mΩ | 150 |
| Insulation Resistance (min) | Ω | 109 |
| Capacitance (typ) | pF | 0.2 |
Miscellaneous
| Operate Time (max) | ms | 0.35 |
| Bounce Time (max) | ms | 0.15 |
| Release Time (max) | ms | 0.15 |
| Resonance Frequency (typ) | Hz | >2000 |
| Operating Frequency (max) | Hz | 500 |
| Operating Temperature Range | °C | -40 to +140 |
| Shock Resistance (½Sin wave for 11ms) | G | 30 |
| Vibration Resistance (10-2000 Hz) | G | 20 |
Ordering Code
R2E-(Formation Code)-(Operate AT Code)
| Formation Code | Lead Type |
| S | Gull-wing SMD |
| F | Low Profile SMD |
| Latch/Unlatch Band Code | ||
| 1 | AT | 10-15 |
| 2 | AT | 15-20 |
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).
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
 | For any application, it is important to select the correct Ampere Turn (AT) or...Continue reading |
Product Handling
 | Reed Switches, Reed Sensor and Magnet Sensors are sensitive devices that easily develop micro...Continue reading |
Reflow Soldering
 | Reflow Soldering is the process of automatically soldering multiple devices to a PCB. Continue...Continue reading |
Manual Soldering
 | Manual Soldering of reed switch leads may be required when using custom plastic housing...Continue reading |
Ferro-magnetic parts
 | Using Ferro-magnetic mounting parts or screws within a 100 mm vicinity of a reed switch will...Continue reading |
Reed Contact Protection Circuits
 | When a reed switch is to be connected to an inductive load or a...Continue reading |
Other Special Configurations
Non standard lead formations
Special Operate AT and Release AT limits
Gold plated leads
Applications
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
 | Latching reed sensors can be mounted on every floor, and a magnet on the...Continue reading |
Reed sensors in Accurate level sensing of fluids
 | Special reed sensors with an integrated resistor can be mounted on PCBs to give...Continue reading |