UM-0018-H Ultra Miniature Reed Switch
These highly sensitive, Ultra Miniature Form A reed switches are designed for low power, high speed switching applications and have an Operate Time of less than 0.3 milliseconds. The 7.0 mm glass version is built for lower Contact Resistance and can switch higher loads of 10W at 100V. The flattened leads are useful for orienting all reed switches in a batch, in one way, while soldering, welding etc., for maximum in-group sensitivity. The cropped version of this UM-0018-H reed switch is suitable for smaller plastic housings and can be soldered to cables, the SMD version is suitable for reflow on PCBs, and the vertical and horizontal mount versions are suitable for mounting on through hole PCBs.
Full Length Leads 
Cropped Leads 
SMD Formed Leads 
Formed Leads for Horizontal Mounting 
Formed Leads for Vertical Mounting
Features
7.0 mm Glass length. Ruthenium contact. Normally Open. Inert gas filled. 4 types of Lead Formations.
Benefits
Omni-polar. Does not require power for operation. Sputtered Contact. RoHS Compliant. Not ESD Sensitive.
Cylindrical and Rectangular Magnets
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Actuation Distances for UM-0018-H Reed Switches
 | For easy selection of AT band and Magnet for an application, we offer Actuation distances for the UM-0018-H Reed Switch in cropped, SMD Continue reading Nov 25, 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 |
| AC Switching Voltage (max) | VAC | 70 |
| 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 | 0.3 |
| Release Time (max) | ms | 0.1 |
| Resonance Frequency (typ) | Hz | <2000 |
| Operating Frequency (max) | Hz | 500 |
| Operating Temperature | °C | -40 to +120 |
| Shock Resistance (½Sin wave for 11ms) | G | 30 |
| Vibration Resistance (10-2000Hz) | G | 20 |
| Test Coil Number | 717 102 003 |
Ordering Code
UM-0018-H-(Operate Band)-(Formation Code)
| Operate Band | AT | 7-20 |
| Corresponding Release Band | AT | 3-18 |
| Formation Code | Lead Type |
| Full Length Leads | |
| C | Cropped |
| S | SMD |
| H | Horizontal Mount |
| V | Vertical Mount |
Examples: UM-0018-H-7-12 denotes 7-12 Operate Band (AT) with Full Length leads. UM-0018-H-15-18-H denotes 15-18 Operate Band (AT) with Goal-post SMD formed leads for horizontal mounting.
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 reed switch. The complete usage notes are available here.
Ampere Turn Selection
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Product Handling
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Manual Soldering
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Ferro-magnetic parts
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Potting and Encapsulation
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Reed Contact Protection Circuits
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Applications
Although we can never restrict the use of a reed switch to a particular field, the following is a list of some of the applications that the UM-0018-H Miniature Reed Switch is known to perform well.
Reed sensors for detecting Ignition Key
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Reed switches in Lightsabers
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Magnet sensors in Musical Greeting Cards
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Reed sensors in Radio-controlled Gliders and model Airplanes
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Reed sensors in Accurate level sensing of fluids
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Reed switches in Washing machine vibration detection
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Reed sensors in Electric Toothbrushes
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Reed switches and Reed sensors in Spirometers
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Miniature Reed sensors in activating Dentist’s Drill
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