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Device is designed to increase relay operating lifetime up to to 10 times longer

23rd July 2007

ES Admin

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Datasheet

IES5541A from Hendon Semiconductors is said to be capable of extending relay electrical operating life up to 10 times longer while allowing the relay to be switched at a higher rate for an easier and more effective way of providing relay contact protection circuit. The IES5541A is an integrated circuit that provides effective relay contact arc suppression. The IES5541A has been designed (patent pending) to provide relay contact protection enabling relays to achieve extended operating lifetime up to ten times longer (over 1 million switches) than non-protected relays.

The IES5541A and its recommended circuitry is compatible with most electromechanical relay and can be applied in situations where wide load types are to be frequently switched and excessive EMI is to be avoided. Ideally suited for AC mains temperature control applications where high mains currents are switched. Typical applications include home appliances and industrial control switching.

The IES5541A circuit helps minimise problems normally associated with relay contact arcing by bypassing the relay contacts with a controlled triac during relay switching. The contacts then only experience minimal arcing, protecting them from deterioration. The IES5541A only triggers the protection triac when initial transients are detected during the onset of switching.

The advanced design of the IES5541A minimises EMI and RFI due to almost total removal of switching transients and accompanying arcing. The IES5541A will also support higher than normal rated switching rate providing tighter temperature control and low hysteresis without sacrificing relay reliability and operating lifetime.

The IES5541A can be easily used with an NTC thermistor sensor, or a logic level (as with a microcontroller). In addition, IES5541A can provide an external power supply for a low power microcontroller or circuitry.

The IES5541A is offered in SO-8 and DIP-8 packaging, all RoHS compliant. Engineering samples and production quantities are available now.