LM50BIM3 Datasheet | National Semiconductor

LM50 SOT-23 Single-Supply Centigrade Temperature Sensor July 1999 LM50 SOT-23 Single-Supply Centigrade Temperature Sensor General Description The LM50 is a precision integrated-circuit temperature sensor that can sense a - 40˚C to +125˚C temperature range using a single positive supply. The LM50’s output voltage is linearly proportional to Celsius (Centigrade) temperature (+10 m V/˚C) and has a DC offset of +500 m V. The offset allows reading negative temperatures without the need for a negative supply. The ideal output voltage of the LM50 ranges from +100 m V to +1.75V for a - 40˚C to +125˚C temperature range. The LM50 does not require any external calibration or trimming to provide accuracies of ± 3˚C at room temperature and ± 4˚C over the full - 40˚C to +125˚C temperature range. Trimming and calibration of the LM50 at the wafer level assure low cost and high accuracy. The LM50’s linear output, +500 m V offset, and factory calibration simplify circuitry required in a single supply environment where reading negative temperatures is required. Because the LM50’s quiescent current is less than 130 µA, self-heating is limited to a very low 0.2˚C in still air. Applications n n n n n n n n n puters Disk Drives Battery Management Automotive FAX Machines Printers Portable Medical Instruments HVAC Power Supply Modules Features n n n n n n n n n n Calibrated directly in degree Celsius (Centigrade) Linear + 10.0 m V/˚C scale factor ± 2˚C accuracy guaranteed at +25˚C Specified for full - 40˚ to +125˚C range Suitable for remote applications Low cost due to wafer-level trimming Operates from 4.5V to 10V Less than 130 µA current drain Low self-heating, less than 0.2˚C in still air Nonlinearity less than 0.8˚C over temp Connection Diagram SOT-23 Order Number LM50BIM3 LM50CIM3 DS012030-1 SOT-23 Device Marking T5B T5C T5B T5C Supplied As 1000 Units on Tape and Reel 1000 Units on Tape and Reel 3000 Units on Tape and Reel 3000 Units on Tape and Reel LM50BIM3X LM50CIM3X Top View...