0.8V threshold supervisor for low-voltage rails
The TPS3899DL08DSER is a nanopower supervisor from Texas Instruments that monitors a single voltage rail with a 0.8V threshold. That 0.8V trip point is designed for modern low-voltage cores — think 0.9V or 1.0V supplies where a standard 1.6V or 2.9V reset IC would never trigger. The active-low, open-drain output lets you wire-OR the reset signal with other supervisors or a manual reset button on the same pull-up line. The reset timeout is 40µs typical — short enough that a power-on glitch on a clean rail won't cause a false reset, but long enough to hold the processor in reset through the supply ramp. The operating temperature range spans -40°C to 125°C, so it can sit on an engine-control board or an outdoor radio without a temperature grade downgrade.
Package and footprint: 6-WSON 1.5x1.5
The part comes in a 6-WSON package measuring 1.5 mm by 1.5 mm (supplier device package 6-WSON). That's a small land pattern — the exposed pad underneath is the thermal and electrical ground connection. For the PCB layout engineer: the pad needs a via array to the ground plane to keep the junction temperature down when the part is dissipating the open-drain pull-up current at high ambient. The 0.50 mm pitch on the outer leads is fine for a two-layer board if the ground pour is generous.
Lifecycle: active, no EOL watch needed
No last-time-buy clock is running. The base product number is TPS3899, so future threshold variants in the same family share the same datasheet and pinout — a useful hedge if the rail voltage changes in a board revision.
Sourcing: quoted to order per RFQ
The TPS3899DL08DSER is supplied by Texas Instruments and sourced through our distribution channel.