10W relay sits on 4x4mm footprint

Standing 12.5mm high, they use reed construction and are called Series 122.

The 10W rating comes at 500mA, and maximum contact ratings are 500mA and 200V.

There is a single energise-to-make instrumentation-grade sputtered-ruthenium contact, whose initial resistance is 180mΩ, and insulation resistance is 10¹²Ω, both contact-to-contact and contact-to-coil.

Life expectancy is 10⁸ operations – less at maximum load.

3V (125Ω) and 5V (350Ω) coils are available, and operating temperature is -20 to +85°C, which can be extended to +125°C if the coil is driven harder – see data sheet for formula.

The switches are fast – typically 150μs or less operate or release, suiting the devices to automatic test system switching matrices or multiplexers. “For ease of servicing or replacement, relays maybe socketed using SMD or through-hole sockets,” said Pickering. “However, care must be taken to mitigate the risk of affecting contact resistance integrity.”

Speaking of the firm’s choice of 4 x 4mm footprint relays, Pickering technical director Graham Dale said: “Series 120 was launched with a switching rating of up to 1A at 20W and a height of 15.5mm. Last year, Series 124 reduced this profile to 9.5mm, but with a lower rating of 0.5A at 5W. This Series 122 device therefore fills the gap, providing customers with the flexibility they need to design in a product that matches their requirements.”