Murata – tightens PTC thermistor tolerance for overheat detection applications
Believed to have the industry’s tightest temperature tolerance of +/- 3 degrees C, the series lineup comprises devices with detection temperatures in the range of +80 degrees C to +150 degrees C in 10 degree C steps. Across the series the thermistor resistance at +25 degrees C is 1 k ohm, with preferred detection points occurring at 10 k ohm and 100 k ohm values.
For example, the PRF15AR102RB6RC part detects +135 degrees C at 10 k ohm and +150 degrees C at 100 k ohm. Maximum voltage is 32 VDC. Available in a compact 0402 package measuring only 1.0 x 0.5 mm, this surface mount device meets the increasing need for consumer end-products to incorporate a means of detecting overheating within space constrained applications. These can include notebook and tablet computers, cellular phones and LED lighting modules. Protection circuits within lithium-ion battery packs and motor coils are other possible applications.