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STMicroelectronics LD1117DT28TR — Analog & Data Acquisition

STMicroelectronics LD1117DT28TR LDO Regulator

MPNLD1117DT28TR
Obsolete

STMicroelectronics LD1117DT28TR, positive fixed LDO regulator, 2.85V output, 800mA current, 1.2V dropout max, 75dB PSRR at 120Hz, DPAK surface-mount package, 0°C to 125°C operating range.

$1.5500Ref. price · indicative, final on quote
STMicroelectronics LD1117DT28TR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LD1117DT28TR specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input15V
Voltage dropout1.2V @ 800mA
Voltage - output (Min (Fixed))2.85V
Output current800mA
Current - quiescent10 mA
Operating temperature0°C ~ 125°C
PSRR75dB (120Hz)
PackageTape & Reel (TR) Cut Tape (CT)
CaseTO-252-3, DPak (2 Leads + Tab), SC-63
Protection featuresOver Current, Over Temperature
Number of regulators1
Output configurationPositive

Product details

Fixed 2.85 V rail for legacy designs

The STMicroelectronics LD1117DT28TR is a single-output positive fixed LDO regulator delivering 2.85 V at up to 800 mA. It comes in a DPAK (TO-252-3) surface-mount package and operates over 0°C to 125°C — a commercial-to-hot range suited for indoor power supplies and industrial control boards that need a clean 2.85 V rail from a 15 V max input.

Dropout voltage and thermal budget at 800 mA

Maximum dropout is 1.2 V at the full 800 mA load. At 2.85 V output that requires at least 4.05 V input to stay in regulation — a 3.3 V rail is too low; plan for a 5 V or higher pre-regulator rail.

Obsolete — sourcing from the aftermarket channel

Expect to work with broker or surplus stock; verify date-code freshness and moisture sensitivity before reflow.

Frequently asked questions

What can replace LD1117DT28TR?

A pin-compatible alternative within the LD1117 family would need to match the DPAK footprint, fixed 2.85 V output, and 800 mA capability. Check the base product number LD1117 for other fixed-voltage variants or adjustable versions that can be set to 2.85 V with external resistors.

Does LD1117DT28TR require a heatsink?

At 800 mA with 1.2 V dropout, the device dissipates nearly 1 W.