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A New Approach to Circuit Breaker Design Using Silicon Carbide Switches - Nov 21
Mechanical circuit breakers can be low cost with minimal losses, but they operate slowly and wear out. Solid state versions overcome the problems and are becoming increasing viable as replacements at...
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Rad-hard multiplexers boast industry’s best ESD protection

The ISL71840SEH, 30V, 16-channel multiplexer is a drop-in replacement for Intersil’s   HS9-1840ARH, which has been aboard nearly every satellite and space exploration mission, including NASA’s recent Orion spacecraft flight test. For applications with form factor constraints, the ISL71841SEH is a 30V, 32-channel multiplexer offering 41% reduced board space compared with an ISL71840SEH two-chip solution.

Both use the company’s silicon on insulator process, which provides single event latch-up (SEL) robustness in heavy ion environments. The enhanced 8kV ESD protection eliminates the need for costly external protection diodes on the input pins, while reduced RON (500Ω at ±5V) and propagation delays of less than 800ns increase the overall performance and accuracy of telemetry signals processed and multiplexed into an ADC input.

Over-voltage protection is 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 ADC. Both multiplexers provide a “cold spare” redundant capability, allowing the connection of two to three additional unpowered multiplexers to a common data bus. This is an especially important feature for mission-critical space flights lasting up to 20 years. If required for any reason, a redundant multiplexer is immediately activated. Both multiplexers provide a wide supply range with split-rail operation from ±10.8 to 16.5V and an absolute maximum of ±20V.

The multiplexers deliver 8kV human body model (HBM) ESD protection and provide true rail-to-rail operation. They have  high dose rate (50-300rad(Si)/s) radiation tolerance of 100krad(Si) and low dose rate (0.01rad(Si)/s) radiation tolerance of 50krad(Si). 

The ISL71840SEH is available in a 18.8 x 14mm, 28-lead ceramic flatpack package, and the ISL71841SEH in a 14 x 14mm, 48-lead ceramic quad flatpack. Both multiplexers are also available in die form. Two evaluation boards are also available - the 16-channel ISL71840SEHEVAL1Z and 32-channel ISL71841SEHEVAL1Z.

 

 

 



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