The ADM8321WAY30ARJZR7 is a single-channel watchdog supervisor IC from the Analog Devices Automotive series, monitoring a single 3V supply rail. It combines a precision voltage monitor with a watchdog timer that expects a periodic toggle on the WDI input — if the microprocessor stops servicing the watchdog within the timeout window, the reset output asserts. The reset output is configurable as either active-high or active-low, and the output driver can be set to open-drain or push-pull. This flexibility means the same part works with both active-low reset microcontrollers and active-high enable inputs on power sequencers, without an external inverter. The 1 ms minimum reset timeout is short enough to avoid delaying system startup, but long enough to let the supply rail settle before the processor comes out of reset. For a 3V rail powering a Cortex-M core, the 1 ms window covers the bulk-capacitor charging transient.
Temperature grade and package — deployment context
An engine-control module or transmission ECU that sees 105°C underhood still has 20°C of margin before the die hits the absolute-max junction temperature. Housed in a 5-lead SOT-23 (SC-74A, SOT-753), the package footprint is 2.9 mm × 1.6 mm with a 0.95 mm pin pitch. The small outline means it fits on the cramped backside of a PCB near the processor, but the narrow pitch demands a solder mask between the pads to prevent bridging during reflow. The automotive series designation signals that this part was qualified to the extended reliability and temperature requirements of the automotive supply chain — not just a commercial-grade part that happens to work at 125°C.
Lifecycle and compliance — active production, RoHS3
Supplied in tape-and-reel packaging, the part is ready for high-volume pick-and-place assembly. The reel quantity is typically 3000 pieces for SOT-23-5, though cut-tape options are available for prototype builds.