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Analog Devices MAX6639FATE+ — DC-DC Power Modules

MAX6639FATE+ Temp Monitor, ±1°C Remote Accuracy, I²C

MPNMAX6639FATE+
End of Life

Maxim Integrated MAX6639FATE+ dual-channel temperature monitor, internal and external sensor, ±1°C remote accuracy, I²C/SMBus output, PWM fan control, 3V–3.6V supply, 16-TQFN (5x5 mm), -40°C to 125°C operating range.

$4.58Ref. price · indicative, final on quote
Packaging16-WQFN Exposed Pad
RoHSROHS3 Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

MAX6639FATE+ specifications
ParameterValue
Output typeI²C/SMBus
Sensor typeInternal and External
MountingSurface Mount
Voltage3V ~ 3.6V
Operating temperature-40°C ~ 125°C
PackageStrip
Accuracy-2.5°C Local(Max), ±1°C Remote(Max)
FunctionFan Control, Temp Monitor
TopologyADC, PWM Generator, Tach Counter
Output fanYes
Output alarmYes
Case16-WQFN Exposed Pad
Sensing temperature0°C ~ 150°C, External Sensor

Product details

Two-channel temp monitor with integrated fan control

It integrates an ADC, a PWM generator for fan-speed control, and a tachometer counter for closed-loop fan monitoring.

Accuracy that matters for closed-loop cooling

Local temperature accuracy is -2.5°C maximum; remote accuracy is ±1°C maximum.

3.3 V rail, I²C bus, PWM fan drive

Supply voltage runs from 3V to 3.6V. The I²C/SMBus interface handles standard bus speeds.

Package and rework — 16-TQFN with exposed pad

That pad needs a good thermal via pattern under it to pull heat into the board.

Frequently asked questions

What is the accuracy of MAX6639FATE+?

The remote channel's ±1°C spec is the tighter one and drives fan-control decisions.

Does MAX6639FATE+ support I2C and PWM fan control?

Yes. The output type is I²C/SMBus, and the topology includes a PWM generator and a tachometer counter, so it can read a fan's speed and adjust the PWM duty cycle accordingly.

Is MAX6639FATE+ a direct replacement for MAX6639?

The MAX6639FATE+ is the same function as the base MAX6639 but in a 16-TQFN (5x5 mm) package. Verify the footprint matches your board layout before substituting — the base MAX6639 may be offered in a different package variant.