NTE7225 Integrated Circuit Precision Temperature Sensor Description: The NTE7225 is a precision temperature sensor in a TO92 type package which can be easily calibrated. This device operates as a 2−Lead Zener and the breakdown voltage is directly proportional to the absolute temperature at 10mV/°K. The circuit has a dynamic impedance of less than 1Ω and operates within a range of current from 450μA to 5mA without alteration of its characteristics. Calibrated at +25°C, the NTE7225 has a typical error of less than 1°C over a 100°C temperature range. Unlike other sensors, the NTE7225 has a linear ouput. Features: D Directly Calibrated in °K D 1°C Initial Accuracy D Operates From 450μA to 5mA D Less Than 1Ω Dynamic Impedance Absolute Maximum Ratings: Forward Current, IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA Reverse Current, IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15mA Operating Free−Air Temperature Range (Note 1), Topr Continuous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40° to +100°C Intermittent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +100° to +125°C Storage temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65° to +150°C Note 1. TJ ≤ +150°C. Temperature Accuracy: Parameter Test Conditions Min Typ Max Unit 2.92 2.98 3.04 V TC = +25°C − 2 6 °C Tmin ≤ TC ≤ Tmax − 4 9 °C Operating Output Voltage TC = +25°C, IR = 1mA Uncalibrated Temperature Error IR = 1mA Temperature Error with +25°C Calibration IR = 1mA, Tmin ≤ TC ≤ Tmax − 1 2 °C Calibration Error at Extended Temperature TC = Tmax (intermittent) − 2 − °C Non−Linearity IR = 1mA − 0.3 1.5 °C Electrical Characteristics: (Note 2) Parameter Test Conditions Min Typ Max Unit Operating Output Voltage Change With Current 450μA ≤ IR ≤ 5mA at Constant Temperature − 3 14 mV Dynamic Impedance IR = 1mA − 0.6 − Ω − +10 − mV/°C Still Air − 80 − s Air 0.5m/s − 10 − s Stirred Oil − 1 − s TC = +25°C − 0.2 − °C/kh Output Voltage Temperature Drift Time Constant Time Stability Note 2. Accuracy measurements are made in a well−stirred oil bath. For other conditions, self heating must be considered. .135 (3.45) Min .210 (5.33) Max Seating Plane .021 (.445) Dia Max .500 (12.7) Min Adj V− V+ .100 (2.54) .050 (1.27) .165 (4.2) Max .105 (2.67) Max .205 (5.2) Max .105 (2.67) Max