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Texas Instruments TPS3839K50DQNT — Power Management (PMIC / Gate Driver)

TPS3839K50DQNT – Texas Instruments Simple Reset/Power-On

MPNTPS3839K50DQNT
Active

Texas Instruments TPS3839K50DQNT, Simple Reset/Power-On Reset IC, 1-channel supervisor, active-low push-pull output, 4.38V threshold, 120ms minimum reset timeout, -40°C to 85°C, 4-X2SON (1x1) package.

$1.1900Ref. price · indicative, final on quote
Texas Instruments TPS3839K50DQNT datasheet (PDF)
Packaging4-XDFN Exposed Pad
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

TPS3839K50DQNT specifications
ParameterValue
TypeSimple Reset/Power-On Reset
MountingSurface Mount
Voltage - threshold4.38V
Number of voltages monitored1
Operating temperature-40°C~85°C(TA)
ResetActive Low
OutputPush-Pull, Totem Pole
PackageTape & Reel (TR); Cut Tape (CT)
Reset timeout120ms Minimum
Case4-XDFN Exposed Pad

Product details

Supervisor for a 5V rail — threshold and timeout

The TPS3839K50DQNT is a single-channel voltage supervisor that asserts a reset output when the monitored supply drops below 4.38V. That threshold is a good fit for a nominal 5V rail — it gives roughly 12% undervoltage margin before the reset fires, which keeps the downstream processor out of brownout territory. The reset timeout is a minimum of 120ms, long enough for most MCU and SoC power-on-reset sequences to complete before the part de-asserts.

Temperature grade and package constraints

Frequently asked questions

Is TPS3839K50DQNT active low or active high?

The reset output is active low — it goes low when the supply drops below the threshold and remains low through the 120ms minimum timeout after recovery.

Can TPS3839K50DQNT work with a 3.3V supply?

No. The threshold is 4.38V, which is designed for a nominal 5V rail. For a 3.3V rail, consider a variant with a lower threshold such as the TPS3839K33DQNT.

What is the difference between TPS3839K50DQNT and TPS3839K33DQNT?

The two parts differ only in the reset threshold voltage: the K50 variant trips at 4.38V (for 5V rails), while the K33 variant trips at a lower voltage suitable for 3.3V rails. All other specs — package, timeout, output type, temperature range — are identical.