Skip to main content
Log in
STMicroelectronics LD39020ATPU185R — Power Management (PMIC / Gate Driver)

STMicroelectronics LD39020ATPU185R LDO Regulator

MPNLD39020ATPU185R
End of Life

STMicroelectronics LD39020 series, Linear Voltage Regulator IC, Positive Fixed 1 Output, 200mA, 4-XDFN Exposed Pad, Surface Mount, -40°C ~ 125°C.

$0.53Ref. price · indicative, final on quote
STMicroelectronics LD39020ATPU185R datasheet (PDF)
Packaging4-XDFN Exposed Pad
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LD39020ATPU185R specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input5.5V
Voltage dropout0.35V @ 200mA
Voltage - output (Min (Fixed))1.85V
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

1.85V fixed LDO for noise-sensitive rails

The LD39020ATPU185R: Key for analog and RF supply chains: PSRR holds at 80 dB at 1 kHz and stays above 55 dB through 100 kHz, meaning it still knocks down switching-regulator ripple well into the hundred-kilohertz range. Quiescent current is 40 µA, so it can sit on an always-on rail in battery-powered designs without draining the cell.

Protection and package realities

Built-in over-current, over-temperature, and soft-start protection cover the common fault modes for a local rail. For 200 mA at moderate dropout this is manageable; for sustained near-dropout operation at high ambient, check the thermal impedance.

The LD39020ATPU185R is an active, current-production device per STMicroelectronics. No last-time-buy or obsolescence notice is in effect. It is ROHS3 compliant and available through independent distribution.

Frequently asked questions

What is the PSRR of LD39020ATPU185R?

PSRR is 80 dB at 1 kHz and 55 dB at 100 kHz. It rolls off with frequency but still provides meaningful attenuation of switching-regulator ripple well into the hundred-kilohertz band.

Can LD39020ATPU185R replace LD39020ATPU125?

Both are in the same LD39020 family with the same pinout and package. The difference is the fixed output voltage: 1.85V for the ATPU185R versus 1.25V for the ATPU125. They are not drop-in replacements unless the load voltage matches.