This datasheet introduces Microchip's TC74 temperature sensor. The sensor has SOT-23-5 package and outputs 8-bit digital temperature data via a 2-wire SMBus/I2C compatible serial port. The sensor can be used in hard disk drives, PC card devices, low-cost thermostats, power supplies and other applications.
The TC74 is a serially accessible digital temperature sensor designed for low‑cost, small‑form‑factor applications. It converts temperature from an onboard solid‑state sensor to an 8‑bit digital word and communicates via a 2‑wire SMBus/I²C‑compatible serial port. The device offers ±2 °C accuracy from +25 °C to +85 °C and ±3 °C accuracy from 0 °C to +125 °C, with a resolution of 1 °C and a conversion rate of about 8 samples per second.
The datasheet details electrical characteristics, pin functions, timing diagrams, register maps, and packaging information for both SOT‑23‑5 and TO‑220‑5 variants. It also includes standby mode operation (5 µA typical) and default SMBus address information, making it suitable for integration into PC peripherals, power supplies, and thermostat controls.
| Operating Voltage Range | 3.0 V to 5.5 V |
|---|---|
| Accuracy (+25 °C to +85 °C) | ±2 °C |
| Accuracy (0 °C to +125 °C) | ±3 °C |
| Power Consumption (active) | 200 µA |
| Power Consumption (standby) | 5 µA (typical) |
| Temperature Resolution | 1 °C |
| Conversion Rate | 8 samples per second |
| SMBus Clock Frequency | 10 kHz to 100 kHz |
| Temperature Range (specified) | -40 °C to +125 °C |
The default SMBus address is 1001 101b.
In standby mode the TC74 draws about 5 µA typical.
The temperature resolution is 1 °C per LSB.
The device operates from 3.0 V up to 5.5 V, with an absolute maximum rating of 6 V.