A Study on Using Solid State Relay (SSR) in Automatic Test Equipment
The performance of SSR has improved tremendously in recent years thanks to the innovation of the industry which has started to challenge the Reed Relay in the ATE.
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Authored By:
Eric Xu
Agilent Technologies Singapore Pte. Ltd.
Summary
In Automatic Test Equipment (ATE), a switching device is required to connect to the Device under Test (DUT) for all sorts of testing, like shorts, pins, analog unpowered and powered tests. The switching needs to be constantly turned on and off with hundreds of millions of operations over the course of its life and endure high "turn-on" current. So far, reed relays fit this bill very well, compared to other mechanical relays, and have been commonly used in this industry for decades. (Figure 1 shows a reed relay and a PCBA.)
Conclusions
The performance of SSR has improved tremendously in recent years thanks to the innovation of the industry which has started to challenge the Reed Relay in the ATE. This hybrid SSR/Reed relay switching matrix used in circuit test system shows good potential to achieve 100 percent replacement in the near future.
Initially Published in the IPC Proceedings
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