Two-rail supervisor in a six-pin SOT-23
The MAX6828LUT-T is a 2-channel multi-voltage supervisor from Analog Devices, packaged in a SOT-23-6. It monitors two supply rails with a fixed 4.63V threshold on one input and an adjustable threshold on the second, asserting a common active-low reset output when either rail falls below its threshold. The reset output is open-drain, allowing it to be wire-ORed with other reset signals on the board. The minimum reset timeout is 140ms, long enough to let the system power supplies and oscillators stabilise before the processor starts executing code.
What the thresholds mean for your rail budget
One channel has a fixed 4.63V threshold, which suits a nominal 5V rail — the supervisor asserts reset before the rail drops below the minimum operating voltage of a typical 5V logic or MCU supply. The second channel uses an adjustable threshold set by an external resistor divider, so it can monitor a 3.3V, 2.5V, or any other rail down to the supervisor's own supply range. At 125°C junction temperature, the threshold accuracy and reset timeout still meet the datasheet limits — no derating required for the supervisor itself, though the external resistor divider for the adjustable channel should use low-tolerance, low-TCR parts to keep the threshold stable across temperature.
Sourced to order against the BOM line through independent distribution. No pin-compatible second source is listed on the manufacturer's cross-reference.