2.93V threshold — what it means for 3.3V rail monitoring
The TPS3838K33QDBVRQ1 is a Texas Instruments simple reset IC with a 2.93V threshold, designed to monitor a single 3.3V supply rail in automotive systems. The threshold sits at roughly 89% of the nominal 3.3V rail, so the reset asserts before the downstream logic sees a brownout below its minimum operating voltage. The active-low, open-drain output lets multiple reset outputs wire-OR together on a shared pull-up — common in multi-rail ECU designs where any fault pulls the master reset line low.
The full temperature span covers under-hood and cabin electronics without derating the threshold accuracy or reset timeout. The 10ms minimum reset timeout is long enough to ride through supply glitches from a cranking engine or load dump, but short enough that the ECU micro does not hang in reset during a transient.
For automotive programs with multi-year production runs, this means no last-time-buy exposure and no forced redesign mid-cycle.