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STMicroelectronics LD3985M28R — Power Management (PMIC / Gate Driver)

ST LD3985M28R 2.8V 150mA LDO, SOT-23-5

MPNLD3985M28R
End of Life

STMicroelectronics LD3985M28R, fixed-output 2.8V LDO, 150mA, 0.1V dropout at full load, 60dB~50dB PSRR (1kHz~10kHz), SOT-23-5, -40°C to 125°C, active.

$0.85Ref. price · indicative, final on quote
PackagingSC-74A, SOT-753
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LD3985M28R specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input6V
Voltage dropout0.1V @ 150mA
Voltage - output (Min (Fixed))2.8V
Output current150mA
Current - supply250 µA
Current - quiescent150 µA
Operating temperature-40°C ~ 125°C
PSRR60dB ~ 50dB (1kHz ~ 10kHz)
PackageTape & Reel (TR); Cut Tape (CT)
CaseSC-74A, SOT-753
Control featuresEnable
Protection featuresOver Current, Over Temperature
Number of regulators1
Output configurationPositive

Product details

Fixed 2.8 V rail, 150 mA — what it delivers

PSRR measures 60 dB at 1 kHz, dropping to 50 dB at 10 kHz — enough to clean up switching-regulator ripple in the audio band and low-frequency noise from a DC-DC converter. The operating temperature range of -40°C to 125°C qualifies it for automotive under-hood, industrial motor drives, and outdoor telecom equipment where the ambient can swing hard.

Sourcing and lifecycle

The LD3985M28R carries an Active lifecycle status with ROHS3 compliance. No last-time-buy or obsolescence notice is on record. Sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — no stock count or price is published here.

Frequently asked questions

Does LD3985M28R have an enable function?

Yes, the LD3985M28R includes an Enable control feature.

Can LD3985M28R be used with 5V input?

Yes. The maximum input voltage is 6 V, so a 5 V rail is within the safe operating range.

What is the pinout of LD3985M28R?

The LD3985M28R is in a standard SOT-23-5 package. Pin assignments follow the typical LDO with enable: consult the ST datasheet for the exact pin map.