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Analog Devices MAX821UUS+T — Discrete Semiconductors

MAX821UUS+T Simple Reset/Power-On Reset, 2.78V Threshold

MPNMAX821UUS+T
End of Life

Maxim Integrated MAX821UUS+T, Simple Reset/Power-On Reset, 1 Channel, Active Low, Push-Pull Output, 2.78V Threshold, Adjustable Timeout, SOT-143-4, -40°C to 125°C.

$3.24Ref. price · indicative, final on quote
PackagingTO-253-4, TO-253AA
RoHSROHS3 Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

MAX821UUS+T specifications
ParameterValue
TypeSimple Reset/Power-On Reset
MountingSurface Mount
Voltage - threshold2.78V
Number of voltages monitored1
Operating temperature-40°C ~ 125°C (TA)
ResetActive Low
OutputPush-Pull, Totem Pole
PackageTape & Reel (TR); Cut Tape (CT)
Reset timeoutAdjustable/Selectable
CaseTO-253-4, TO-253AA

Product details

Temperature grade — industrial to under-hood range

Push-pull output — no external pull-up resistor

The push-pull (totem-pole) output drives the reset line high or low without needing an external pull-up. That saves a resistor and one PCB trace, which matters on dense boards or when the reset net is shared across multiple loads. Active-low polarity is the common convention for microcontroller reset pins — the supervisor pulls the line low on a fault and releases it high when the supply is valid.

If you are qualifying this for a production BOM, the active lifecycle and ROHS3 compliance clear the two main gates. Submit an RFQ for a firm price and delivery window.

Frequently asked questions

What is the reset output type of MAX821UUS+T?

The reset output is active-low, push-pull (totem pole). It drives the reset line low on a fault and releases it high when the supply is valid, with no external pull-up resistor required.

Does MAX821UUS+T have an adjustable reset timeout?

Yes, the reset timeout is adjustable/selectable, allowing the designer to set the reset pulse duration to match the processor's power-up settling time.

Is MAX821UUS+T compatible with 3.3V systems?

Yes, the 2.78V threshold is designed for 3.3V rails. It asserts reset before the supply drops into the undefined-logic region of 3.3V logic, while providing enough margin to avoid nuisance trips on normal ripple.