Renesas: radiation-hardened precision current source for sensing applications

Renesas Electronics announced the ISL70591SEH and ISL70592SEH radiation-hardened precision current sources designed to provide current excitation to the more than 300 resistive sensors that monitor the health of a satellite’s subsystems. The two new Renesas devices are the first current source ICs in its line of space products, and are ideally suited for telemetry, tracking & command, attitude & orbital control, and electrical power subsystem applications.

The ISL70591SEH and ISL70592SEH come in 4-lead ceramic flatpack packages and provide 100µA and 1mA of output current, respectively. They offer a smaller footprint than competitive devices, and replace the discrete solutions that typically require three to five components. The smaller package size boosts reliability by placing the excitation source closer to the sensor. The Renesas current source ICs also reduce system errors by delivering ultra-low noise for higher accuracy over temperature and radiation. Their high output impedance rejects voltage variations on the supply line, and lets designers parallel multiple current sources if they need higher current.

The ISL70591SEH and ISL70592SEH deliver ultra-high performance in the most demanding environments by leveraging Renesas’ proprietary silicon on insulator process, which provides single event latch-up (SEL) and single event burn-out (SEB) robustness in heavy ion environments. Both devices are radiation assurance tested to 100krad(Si) at high dose rate and 75krad(Si) at low dose rate. In addition, Renesas’ innovative floating design lets users create a current source or sink with no ground connection.

The ISL70591SEH and ISL70592SEH can be combined with the following Renesas space parts to form an analog signal chain that includes power management and communications devices: ISL71590SEH temperature sensor, ISL71840SEH 16-channel multiplexer, ISL70517SEH instrumentation amplifier, ISL71090SEH25 low-noise voltage reference, ISL70001ASEH 6A synchronous buck regulator, and ISL72026SEH 3.3V CAN transceiver.

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