What the AEC-Q100 grade means for the BOM
The TMP451JQDQWRQ1: That qualification means the part has passed the reliability stress tests (HTOL, ESD, latch-up, temperature cycling) required for automotive PPAP submissions. It measures both its own die temperature (local) and an external diode-connected transistor (remote) over a 12-bit SMBus interface, with a best accuracy of ±1°C locally and ±2°C remotely across the full automotive temperature range.
Supply, interface, and package constraints
The SMBus output supports standard SMBus protocols including alert response and timeout — useful for multi-sensor bus architectures where a single master polls several TMP451 devices. Packaged in an 8-WSON (2x2.5 mm) with wettable flanks, the footprint allows automated optical inspection (AOI) of the solder joints after reflow — a requirement for automotive assembly lines that cannot rely on X-ray for every board. The small package suits space-constrained ECU designs.
Active lifecycle and sourcing posture
Texas Instruments lists the TMP451JQDQWRQ1 as Active (current production) and RoHS3 compliant.