The Pickering Series 108-1-A-5/2D is a single-pole, normally open reed relay with a 5 V coil resistance of 500 Ω, designed for direct TTL logic drive. It features a mu-metal encapsulation that limits magnetic interaction to 1% in dense stacking, operates on a 0.15-inch (3.8 mm) pitch, and delivers dry switching of up to 1 A at 20 W with insulation resistance exceeding 10¹² Ω and contact resistance of 0.12 Ω. Capacitance across the open switch is 0.15 pF, and typical operate and release times are 0.5 ms and 0.2 ms respectively. The relay supports operation from -20 to +85 °C and is rated for up to 10⁹ operations under low-load conditions. It is supplied in a single-in-line package with specified dimensions of 20.0 mm length by 3.7 mm width.
The Pickering Series 108 is a range of magnetically screened single-in-line reed relays that stack on 0.15 inches (3.8mm) pitch, resulting in a 25 percent saving in board space over 0.2 inch (5.08mm) wide relays. This means that it is possible to pack 33 percent more relays into the same board area.
Their small size, superb contact resistance stability and ultra high insulation resistance, greater than 1012 ohms for Form A devices, make these relays a popular choice for high quality instrumentation.
The device is encapsulated in a mu-metal can using a very high resistivity resin. Mu-metal is used rather than steel because of both its very high permeability and its low magnetic remanance. This construction totally eliminates the risk of magnetic interaction problems. Magnetic interaction is usually measured as a percentage increase in the voltage required to operate a relay when two additional relays, stacked one each side, are themselves operated. An unscreened device mounted on this pitch would have an interaction figure of around 40 percent, it would therefore be totally unsuitable for applications where relays are to be packed densely. Pickering Series 108 have a typical interaction figure of only 1 percent.
Dry switches are available in 1 or 2 Form A (energize to make) and 1 Form C (change-over) configurations. 3, 5 and 12 Volt coils are available, 5 Volt coils have a resistance of 500 Ohms and may therefore be driven directly from TTL logic.h
| Pickering Electronics | |
|---|---|
| Product Category | Electromechanical Relays |
| Product Number | 108-1-A-5/2D |
| Product Name | Series 108 |
| Relay Type | General; Reed Relay |
| Mounting | PCBoard |
| Poles | Single Pole (SP) |
| Throw | Single Throw |
| NO | 1 |
