What this sensor does on your board
The MAX6642ATT92+T is a digital temperature sensor from Maxim Integrated that measures both its own die temperature (local) and the temperature of an external diode-connected transistor (remote) via a two-wire SMBus interface. It resolves temperature to 10-bit resolution and reports it digitally — no ADC channel or analog conditioning needed on your side. The part includes programmable over-temperature limit with an output switch, a one-shot conversion mode for low-power polling, and a standby mode that drops the supply current when idle.
Where it fits — temperature range and accuracy
That covers motor-drive heatsinks, power-supply hot spots, server-rack inlet monitoring, and under-hood automotive electronics. Accuracy is ±2°C typical, ±3°C maximum across the full range — tight enough for thermal-throttling decisions and fan-speed control loops.
No direct replacement or second source is listed.