LM135 datasheet in PDF, the National Semiconductor precision temperature sensor that behaves like a Zener diode whose breakdown voltage changes by 10 mV per kelvin. The family also includes LM235 and LM335 versions with different temperature ranges. The document gives pinout, calibration with the adjust pin, accuracy figures and application circuits. Technicians use it to verify a sensor reading against ambient temperature, check bias current, and recalibrate thermometer and thermostat circuits after replacement.
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