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Analog Devices DS1231-20+ — DC-DC Power Modules

DS1231-20+ Simple Reset/Power-On Reset, 150ms Timeout

MPNDS1231-20+
End of Life

Maxim Integrated DS1231-20+, Simple Reset/Power-On Reset IC, Active High/Active Low reset, Open Drain output, 150ms minimum reset timeout, 4.37V/4.62V thresholds, 0°C~70°C, 8-DIP (0.300", 7.62mm) package, Through Hole mounting.

$10.65Ref. price · indicative, final on quote
Analog Devices DS1231-20+ datasheet (PDF)
Packaging8-DIP (0.300", 7.62mm)
RoHSROHS3 Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

DS1231-20+ specifications
ParameterValue
TypeSimple Reset/Power-On Reset
MountingThrough Hole
Voltage - threshold4.37V, 4.62V
Number of voltages monitored1
Operating temperature0°C ~ 70°C (TA)
ResetActive High/Active Low
OutputOpen Drain or Open Collector
PackageTube
Reset timeout150ms Minimum
Case8-DIP (0.300\", 7.62mm)

Product details

The Maxim Integrated DS1231-20+ 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 a programmed threshold. It provides both active-high and active-low reset outputs from an open-drain output stage, giving the designer flexibility to interface with either polarity of the system's reset input.

Thresholds and temperature — fit for your rail

This part monitors a single voltage with two internal thresholds: 4.37 V and 4.62 V. The dual-threshold scheme provides built-in hysteresis — the reset asserts at the lower threshold and de-asserts at the higher one, preventing chatter during a slowly rising supply.

Housed in an 8-pin PDIP (0.300" wide, 7.62 mm pitch) with through-hole mounting, the DS1231-20+ is a straightforward part to hand-assemble or rework.

Frequently asked questions

What does the 150 ms reset timeout mean for my design?

The 150 ms minimum reset timeout ensures the supervisor holds the processor in reset long enough for the power supply and clock oscillator to reach stable operating conditions before the system starts executing code. This is a standard duration for most microcontroller and DSP applications.

What is the closest pin-compatible alternative to DS1231-20+?

The DS1231 family includes multiple threshold and timeout variants in the same 8-PDIP footprint. The DS1231-20+ is the version with 4.37 V / 4.62 V thresholds and a 150 ms timeout. Other family members differ in threshold voltages or timeout durations but share the same pinout.