Silicon thermistor

Andigilog has launched its SiMISTOR family of silicon thermistors that can measure temperature to 1 degree Celsius and provide a linear voltage output proportional to temperature.

The company claims that the linearity and accuracy of the SiMISTOR family products eliminate expensive analog-to-digital converters, look-up tables and complex processing equations that traditional thermistors need to get an accurate temperature measurement. SiMISTOR sensors are calibrated during the manufacturing process, eliminating lot-to-lot variations found in traditional thermistors.

The SiMISTOR family includes the aSM120, aSM121 and the aSM122 sensors.

The aSM120 sensor operates with either a traditional series resistor or a current source. It has an operating voltage range of +2.7V to +6V. The aSM120 sensor offset voltage at 0 degree C is +2V with an output temperature slope of 10mV/degree C.

The aSM121 and aSM122 sensors do not require the traditional series resistor for the output voltage. They have a specific pin for output temperature. These parts also have an operating voltage range of +2.7V to +6V. The aSM121 sensor has an offset of 500mV at 0 degree C with an output temperature slope of 10mV/degree C, while the aSM122 has an offset voltage of 600mV at 0 degree C with an output temperature slope of 15mV/degree C.

The family comes in quad flat no-lead (QFN) plastic packages with a maximum of 0.8 mm (height), with the aSM120 sensor packaged in a two-lead version (1.3mm x 0.9mm) and the aSM121 and aSM122 sensors packaged in three-lead versions (1.2mm x 1.5mm).

The aSM120, aSM121 and aSM122 products are sampling now, with volume production beginning Q2 2004. The pricing for the aSM120, in the two-lead QFN package, is $0.49 per unit in 1K unit quantities. The pricing for the aSM121 and aSM122, in the three-lead QFN package, is $0.35 per unit in 1K unit quantities.

An evaluation kit is available now free of charge.

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