The Maxim Integrated MAX821MUS+T is a Simple Reset/Power-On Reset supervisor IC that monitors a single voltage rail and asserts a reset signal when the supply drops below the threshold. It is designed for microprocessor, microcontroller, and logic-system power monitoring where a clean, glitch-free reset is required on power-up or brownout. The reset output is active low and uses a push-pull, totem-pole stage, so no external pull-up resistor is needed. The reset timeout is adjustable or selectable, giving the designer flexibility to match the downstream device's startup timing.
MAX821MUS+T Simple Reset/Power-On Reset IC, 4.38V Threshold
MPNMAX821MUS+T
End of Life
Maxim Integrated MAX821MUS+T, Simple Reset/Power-On Reset, Active Low, Push-Pull Output, 4.38V Threshold, SOT-143-4, -40°C to 125°C.
$3.54Ref. price · indicative, final on quote
PackagingTO-253-4, TO-253AA
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Type | Simple Reset/Power-On Reset |
| Mounting | Surface Mount |
| Voltage - threshold | 4.38V |
| Number of voltages monitored | 1 |
| Operating temperature | -40°C ~ 125°C (TA) |
| Reset | Active Low |
| Output | Push-Pull, Totem Pole |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Reset timeout | Adjustable/Selectable |
| Case | TO-253-4, TO-253AA |
Product details
Frequently asked questions
What is the exact reset threshold voltage of MAX821MUS+T?
The reset threshold voltage is 4.38V, suitable for monitoring a 5V nominal supply rail.
What package does MAX821MUS+T come in?
It comes in a SOT-143-4 surface-mount package, also described as TO-253-4 or TO-253AA. The supplier device package is SOT-143-4.
Is MAX821MUS+T RoHS compliant?
Yes, it is ROHS3 compliant.