R4 Ultra-miniature SMD Reed Sensor
These R4 ultra-miniature SMD reed sensors are designed for signal switching applications and have a size advantage over the standard size SMD reed sensor. As they are molded with 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, Static Contact Resistance and Variable Contact Resistance before packing. The R4 Ultra-miniature reed sensor, Being an omni-polar device, this sensor can be actuated with either a north pole or a south pole or both. 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.
R4-S SMD Reed Sensor 
R4-S Reed Sensor PCB Layout drawing 
R4-F SMD Reed Sensor 
R4-F Reed Sensor PCB Layout drawing 
R4 Reed Sensor Packing Tape
Features
Normally Open contact. Two sensitivity bands. Molded with internal blades parallel to SMD feet. Packed in Tapes for automatic assembly.
Actuation Distances for R4 Ultra Miniature Reed Sensors
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Operate and release distances for the R4 ultra-miniature reed sensor in the two lead formations and two standard AT bands when actuated
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Jun 4, 2021 |
Cylindrical and Rectangular Magnets
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Drawing of Cylindrical MagnetsDrawing of Rectangular Bar Magnets starFeaturesNdFeB High Energy. Nickel coated. Energized
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Nov 18, 2020 |
Electrical
| Contact Form | A | |
| Contact Rating (max) | W/VA | 10.0 |
| Switching Current (max) | A | 0.5 |
| Carry Current (max) | A | 0.5 |
| DC Switching Voltage (max) | VDC | 100 |
| Breakdown Voltage (min) | VDC | 150 |
| Contact Resistance (max) | mΩ | 200 |
| Insulation Resistance (min) | Ω | 109 |
| Capacitance (typ) | pF | 0.2 |
Miscellaneous
| Operate Time (max) | ms | 0.35 |
| Bounce Time (max) | ms | 0.30 |
| Release Time (max) | ms | 0.10 |
| 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
R4-(Formation Code)-(Operate Band Code)
| Formation Code | Lead Type |
| S | Gull-wing SMD |
| F | Low Profile SMD |
| Operate Band Code | ||
| 1 | AT | 10-15 |
| 2 | AT | 15-20 |
Examples: R4-S-1 denotes R4 Reed Sensor with Gull-wing SMD formed leads in 10-15 Operate band (AT). R4-F-2 denotes R4 Reed Sensor with Low Profile SMD formed leads, in 15-20 Operate 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
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For any application, it is important to select the correct Ampere Turn (AT) or magnetic sensitivity of a Reed Switch, Reed Sensor or
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Aug 27, 2020 |
Product Handling
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Reed Switch Handling Reed Switches, Reed Sensor and Magnet Sensors are sensitive devices that easily develop micro cracks in the glass
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Aug 31, 2020 |
Reflow Soldering
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Reflow Soldering is a process of automatically soldering multiple devices on a PCB. This is usually done after components are
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Aug 28, 2020 |
Manual Soldering
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Soldering of Reed Switches and Reed Sensors requires some care to ensure that these delicate devices are not inadvertently damaged. Damage
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Nov 10, 2020 |
Ferro-magnetic parts
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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.
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Sep 4, 2019 |
Reed Contact Protection Circuits
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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.
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Aug 31, 2020 |
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 R4 Reed Sensor is known to perform well.
Reed Switches and Reed Sensors in Capsule Endoscopy
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Endoscopy Pill For most people, an endoscopy is extremely intrusive and uncomfortable. But, before a Gastroenterologist can fully
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Nov 6, 2020 |
Reed switches and Reed Sensors in Portable Defibrillators
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Defibrillator Defibrillation is a treatment for life-threatening cardiac arrhythmia, or irregular heart beat. This condition is also
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Nov 6, 2020 |
Reed Sensors in Electric Car Chargers
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Electric Car Charging Station Electrical cars are designed to have a range of 250-300 kilometers on a full charge. To ensure that the
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Nov 7, 2020 |
Reed Switches and Reed sensors in Canal Hearing Aids
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In-canal Hearing Aid As widely known, Hearing Aids are devices designed to improve hearing by making sound audible to a person with
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Nov 6, 2020 |
Reed sensors used in Fuel cap position sensing
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Automobile fuel cap open A dashboard or an instrument panel located in front of the automobile driver and displays instrumentation and
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Nov 7, 2020 |
Reed sensors in weather proof electronics
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IP67 certified Smart phone The IP67 Code or the International Protection Marking states standards for weather proof electrical and
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Nov 6, 2020 |
Reed switches in Vagus Nerve Stimulators
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Vagus Nerve Stimulator The Vagus nerve in the neck is one of the primary communication lines to the brain. For patients with epilepsy
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Nov 6, 2020 |