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STMicroelectronics LD39020ADTPU18R — Power Management (PMIC / Gate Driver)

STMicroelectronics LD39020ADTPU18R LDO Regulator, 1.8V Fixed

MPNLD39020ADTPU18R
End of Life

STMicroelectronics LD39020ADTPU18R, positive fixed LDO regulator, 1.8V output, 200mA output, 5.5V max input, 40µA quiescent current, PSRR 80dB~55dB (1kHz~100kHz), -40°C~125°C junction temp, 4-XDFN exposed pad package.

$0.53Ref. price · indicative, final on quote
STMicroelectronics LD39020ADTPU18R datasheet (PDF)
Packaging4-XDFN Exposed Pad
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LD39020ADTPU18R specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input5.5V
Voltage dropout0.35V @ 200mA
Voltage - output (Min (Fixed))1.8V
Output current200mA
Current - quiescent40 µA
Operating temperature-40°C ~ 125°C (TJ)
PSRR80dB ~ 55dB (1kHz ~ 100kHz)
PackageTape & Reel (TR); Cut Tape (CT)
Case4-XDFN Exposed Pad
Control featuresEnable
Protection featuresOver Current, Over Temperature, Soft Start
Number of regulators1
Output configurationPositive

Product details

The STMicroelectronics LD39020ADTPU18R is a single-output, positive fixed LDO regulator delivering 1.8V at up to 200mA. It's built for noise-sensitive rails where PSRR matters — the 80 dB at 1 kHz dropping to 55 dB at 100 kHz cleans up switching ripple from a preceding DC-DC converter.

Package and mounting — field-swap reality

Package is 4-DFN (1x1 mm), surface-mount only. The exposed pad needs a via stitch for heat dissipation.

Protection features — built-in safety nets

Over-current, over-temperature, and soft-start protection are on-chip. Soft-start limits inrush at power-up.

It's a current-production part from ST, available through independent distribution. Pricing and stock are confirmed at quote time — submit an RFQ for the current market picture.

Frequently asked questions

What is the closest functional equivalent to LD39020ADTPU18R?

The LD39020DTPU33R is the same LDO family but with a 3.3V fixed output instead of 1.8V. It shares the same PSRR profile, 200 mA rating, package, and protection features, so it's a direct drop-in if your rail voltage changes. For a higher-current alternative, the LDFP family offers 1 A output with adjustable voltage and power-good flag.

Can LD39020ADTPU18R be used with ceramic output capacitors?

Yes — the LD39020ADTPU18R is stable with ceramic output capacitors. The soft-start feature helps manage inrush when using low-ESR ceramics, and the 40 µA quiescent current stays low regardless of the output cap ESR.

What is the PSRR of LD39020ADTPU18R?

PSRR is 80 dB at 1 kHz, rolling off to 55 dB at 100 kHz. That's strong rejection of switching-regulator ripple in the audio band, but at 100 kHz the rejection drops enough that you still need good layout and a clean input rail.