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SSRs feature fast switching

Posted: 02 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:ASSR-3220? ASSR-322R? solid-state relay? Avago? Gina Roos?

Avago Technologies has introduced a pair of dual-channel, high-speed, optically-isolated MOSFET-output solid-state relays (SSRs) that operate over a wide industrial temperature range of -40C to 85C.

Compared to electromechanical relays, the ASSR-3220 and ASSR-322R SSRs offer inherent advantages including no contact bounce and problems due to shock, vibration or mounting position. In addition, SSRs have no wear out mechanism to limit the number of operations, and require no minimum contact "wetting" current. They are also free from magnetic fields, do not generate electrical noise, and are not sensitive to EMI, said the company.

These SSRs are dual channel, providing two independent Form A (normally open) single-pole single-throw relays in an eight-pin dual-inline package (DIP). The output ratings are 250V maximum load voltage and 200mA continuous output current.

Both ASSR products, with reinforced insulation of 3.75kV, feature fast turn-on and turn-off, excellent noise rejection for transient immunity, and low input drive current, which make them CMOS compatible and suitable for battery-operated and USB-powered applications, said the company. Applications include a variety of industrial, consumer and telecommunications switching.

The ASSR-322 R SSR primarily targets automated test equipment and other test equipment applications for pin electronics, multiplexers and matrix cards, and switching in the analog circuits of parametric measurement units. This device features 1nA maximum off-state leakage, low on-resistance of 8.5 ohms maximum, low output capacitance of 60pF maximum at 1MHz, and maximum turn-on and turn-off times of 0.5 ms and 0.2 ms, respectively.

The device is suited for industrial or consumer electronics applications such as telecommunications switching equipment, programmable logic controller outputs and digital I/O outputs, digital home appliances, and set-top boxes. The SSR features a high-output off-state impedance of 10 teraohms typical, low on-resistance of 8.5 ohms typical and high-speed switching of 0.2ms.

Supplied in eight-pin DIP packages, the ASSR-3220 is priced at $3.40 each and the ASSR-322R at $4.20 each, both in quantities of 1,000. Gull-wing surface-mount packages are available. Single channel versions in six-pin DIP and four-pin SOP will be available in fourth quarter 2006.

- Gina Roos

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