Power

Reed relay suits high-PCB-density applications

7th May 2019
Alex Lynn

The reed relay company with a focus on miniaturisation and high performance, Pickering Electronics, has added a new 10W-rated reed relay to its successful 4mm2 product family which features devices that occupy a PCB footprint of only four by four millimetres, facilitating the highest packing density currently available.

Series 122 relays measure 12.5mm in height and are rated with a switching current of 0.5A at 10W. Three and five volt coils are available.

Fast operate and release times, typically 150μs or less, make Series 122 relays ideal for high speed test systems such as A.T.E. switching matrices or multiplexers. The 1 Form A (SPST) Normally Open (NO) Energise-to-make devices feature highest-quality, instrumentation-grade sputtered-ruthenium switches and plastic packages with internal mu-metal magnetic screening to avoid the risk of magnetic interaction issues in densely-packed applications.

Devices have an insulation resistance of greater than 1012Ω and are 100%-tested for dynamic contact resistance to guarantee performance.

Comments Graham Dale, technical director at Pickering Electronics, said: “The Series 120, our first 4mm2 product, was launched with a switching rating of up to one amp at 20W and a height of 15.5mm. Last year, the Series 124 reduced this profile to 9.5mm but with a slightly lower rating of 0.5A at 5W. This new Series 122 device, therefore, fills the gap, providing customers with the flexibility they need to design in a product that exactly matches their requirements.”

For ease of servicing/replacement, relays maybe socketed using SMD or through-hole sockets. However, care must be taken to mitigate the risk of affecting contact resistance integrity.

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