2.5V supervisor for automotive power rails
The Texas Instruments TPS3703B4250DSERQ1 is a Simple Reset/Power-On Reset supervisor in the Automotive AEC-Q100 series, monitoring a single 2.5V supply rail with an active-low, open-drain output. It comes in a 6-WSON (1.5x1.5) surface-mount package and operates over a junction temperature range of -40°C to 125°C, making it suited for under-hood automotive ECU and industrial power-rail monitoring where the reset signal must stay valid across cold crank and hot soak.
Active lifecycle — no last-time-buy risk
The base product number TPS3703 covers the family, and the 'B4250' suffix encodes the 2.5V threshold variant.
What the 2.5V threshold and open-drain output mean for the BOM
The 2.5V threshold (Voltage - Threshold: 2.5V) is the exact trip point at which the reset asserts — this part monitors a 2.5V rail, not a 3.3V or 1.8V rail, so verify your supervised supply voltage matches. The reset is active low, so the output goes low when the monitored voltage drops below threshold and releases high (via the pull-up) when the supply recovers.