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Intersil's Introduces New High Reliability Temperature Sensor for Space Systems
New ISL71590SEH Requires Only 1.5mW (25°C) Power, Provides +/-1.7°C Accuracy and -1°C Shift Over Low Dose Rate Radiation
Developers of the most advanced next generation satellite systems require temperature sensors that provide accuracy over the mission life of a satellite, eliminating the need for expensive radiation lot acceptance testing or spot shielding. With the ISL71590SEH's +/-1.7°C accuracy over temperature and at most -1°C change in accuracy over low dose rate radiation, the device is able to serve satellite temperature sensing functions that support most of a system's telemetry data and calibration accuracy. The ISL71590SEH provides highly accurate, reliable temperature sensing and linearity over the full military temperature range of -55°C to 125°C, as well as over 50krad (Si) low dose rate and 300krad (Si) high dose rate irradiation.
The ISL71590SEH temperature sensor features a high impedance current output that allows the part to be insensitive to voltage drops across long wires. With a voltage between 4V and 33V on the input pin, the ISL71590SEH acts as a temperature sensitive current source with a scale factor of 1μA/K (i.e. 1μA/°C). It operates in the full temperature range without the need of additional circuitry, to produce results with ±1.7°C accuracy.
The ISL71590SEH also offers power advantages, with requirements as low as 1.5mW (5V supply at 25°C). This allows it to be used in satellite signal chains and in applications such as temperature compensation networks, flow rate analysis, and biasing proportional to temperature.
Features and Specifications
- Outstanding, industry leading high and low dose rate performance
- Excellent temperature accuracy and long term stability ensure accurate measurements (±0.25°C over 1000 hours at +125°C.)
- High output impedance (>10MΩ) allows variations in the power supply voltage
- Can withstand a forward voltage of 40V outside of heavy ion radiation
(37V under 86 MeV·cm2/mg heavy ion irradiation) and a reverse voltage of 40V
Pricing and Availability
The ISL71590SEH temp sensor is available now a 2-terminal isolated flatpack easily mountable on a system chassis or circuit board, with prices starting at $324.55 each in 1,000-unit quantities. An evaluation board, the ISL71590SEHEV1Z, also is available at a price of $232.45. For more information visit: www.intersil.com/products/ISL71590SEH
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