The Pickering Series 108-1-C-5/3D is a single-pole change-over reed relay with a 5 V coil, 500 Ω resistance, and internal diode, designed for low-level switching applications. It is encapsulated in a mu-metal can with insulation resistance exceeding 1012 Ω and typical contact resistance of 0.20 Ω. The relay operates at 200 V with a switching capacity of 3 W and 0.25 A, and has a typical capacitance of 0.15 pF across the open switch. It is mounted in a single-in-line package with pins spaced on 0.15 inch (3.8 mm) pitch, allowing dense stacking. The device meets a standard operating temperature range of -20 to +85 °C and offers an operate time of 1.0 ms and a release time of 0.5 ms. Magnetic interaction between stacked relays is typically 1% due to mu-metal shielding.
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-C-5/3D |
| Product Name | Series 108 |
| Relay Type | General; Reed Relay |
| Mounting | PCBoard |
| Poles | Single Pole (SP) |
| Throw | Double Throw |
| NO | 0 |
