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.
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
 | We offer a range of magnets in different sizes and shapes, specially selected to...Continue reading |
Actuation Distances for UM-0018-H Reed Switches
 | On/Off distances for the 7.0 mm UM-0018-H reed switch having cropped, SMD, Horizontal Mount...Continue reading |
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
 | Reed Switches, Reed Sensor and Magnet Sensors are sensitive devices that easily develop micro...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 |
Potting and Encapsulation
 | As some potting compounds cure over 24 hours, the glass seals should be protected....Continue reading |
Reed Contact Protection Circuits
 | When a reed switch is to be connected to an inductive load or a...Continue reading |
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
 | As long as the ignition key detecting reed sensor is not actuated means that...Continue reading |
Reed switches in Lightsabers
 | Reed Switches are used in Lightsabers to for power up only when the owner...Continue reading |
Magnet sensors in Musical Greeting Cards
 | Ultra miniature reed switches can be used in electronic greeting cards with magnets to...Continue reading |
Reed sensors in Radio-controlled Gliders and model Airplanes
 | Reed Sensors are very light devices and can be used in model airplanes, helicopters...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 |
Reed switches in Washing machine vibration detection
 | Reed Switches are used for building bi-directional vibration sensors. These sensors can detect if...Continue reading |
Reed sensors in Electric Toothbrushes
 | Electric toothbrushes use Reed Sensors to sense change in direction when switching from the...Continue reading |
Reed switches and Reed sensors in Spirometers
 | Reed Switches help measure the volume of air intake and the time in a...Continue reading |
Miniature Reed sensors in activating Dentist’s Drill
 | A reed sensor finds the perfect application in such a drill, to work as...Continue reading |