The Pickering Series 108-2-A-12/2D is a 2 Form A (energize to make) reed relay with a 12 V coil, designed for low-level switching applications. It features a mu-metal can enclosure that reduces magnetic interaction to 1 percent, enabling dense stacking on a 0.15 inch (3.8 mm) pitch. Switching capability is 20 W at 200 V with a contact resistance of 0.15 Ω and insulation resistance greater than 1012 Ω. Capacitance across the open switch is not specified. The relay operates at 9 V minimum and releases at 1.2 V maximum, with an operate time of 0.5 ms and a release time of 0.2 ms. It is rated for 10^9 operations at low loads and 10^7 at maximum load. The device supports unofficial extended operation to +125 °C with increased coil drive voltage. The package dimensions are 20.0 mm × 8.9 mm × 3.7 mm, accommodating standard single-in-line mounting.
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 | 108-2-A-12/2D |
| Product Name | Series 108 |
| Relay Type | General; Reed Relay |
| Mounting | PCBoard |
| Poles | Double Pole (DP) |
| Throw | Single Throw |
| NO | 1 |
