Satnews Daily
September 29th, 2015

New Radiation-Hardened Multiplexers For Satellites + Manned Spacecraft Debut From Intersil™

[Satnews] Intersil Corp.™ has introduced the ISL71840SEH and ISL71841SEH radiation-hardened multiplexers for manned spacecraft and satellites.

The multiplexer power electronics devices offer solid electrostatic discharge (ESD) protection and signal chain accuracy and timing performance. The ISL71840SEH 30-volt 16-channel multiplexer is a drop-in replacement for Intersil's HS9-1840ARH, which has been aboard satellite and space exploration missions like the NASA Orion spacecraft flight test.

Intersil's ISL71840SEH Radiation Hardened 30V 16-Channel Analog Multiplexer—typical diagram.

For applications with form factor constraints, the ISL71841SEH 30-volt 32-channel multiplexer offers high-performance and 41 percent reduced board space compared with an ISL71840SEH two-chip solution.

The ISL71840SEH and ISL71841SEH rad-hard multiplexers capitalize on Intersil's proprietary silicon-on-insulator process, which provides single event latch-up (SEL) robustness in heavy ion environments. The enhanced 8-kilovolt ESD protection eliminates the need for external protection diodes on the input pins.

The ISL71840SEH and ISL71841SEH offer over-voltage protection on a per-switch basis to maintain the continuous processing of telemetry test points. If any input channel experiences an over-voltage condition, the remaining channels continue sending data to the A/D converter.

Both multiplexers provide a cold spare redundant capability, allowing the connection of two or three additional unpowered multiplexers to a common databus.