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STMicroelectronics LD1117DT25CTR — Power Management (PMIC / Gate Driver)
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STMicroelectronics / Power Management (PMIC / Gate Driver)

ST LD1117DT25CTR LDO Regulator, 2.5V Fixed, 800mA, DPAK

MPN LD1117DT25CTR
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STMicroelectronics LD1117DT25CTR, positive fixed LDO regulator, 2.5V output, 800mA, 1.3V dropout at full load, 75dB PSRR at 120Hz, -40°C to 125°C, DPAK (TO-252-3).

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[SPEC] Essential Parameters Snapshot Full Specifications (14)
Package / Case TO-252-3, DPak (2 Leads + Tab), SC-63

Full Technical Specifications

14 Parameters
LD1117DT25CTR specifications
Parameter / AttributeSpecification / Value
Output typeFixed
MountingSurface Mount
Voltage - input15V
Voltage dropout1.3V @ 800mA
Voltage - output (Min (Fixed))2.5V
Output current800mA
Current - quiescent10 mA
Operating temperature-40°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
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Technical Details & Description

2.5V fixed rail for industrial and mixed-signal loads

The STMicroelectronics LD1117DT25CTR is a single-output positive fixed LDO regulator delivering a regulated 2.5V output at up to 800mA. The part includes over-current and over-temperature protection, making it a straightforward choice for powering analog front-ends, MCU I/O banks, or sensor rails that need a clean 2.5V supply from a 3.3V or 5V bus.

No LTB or phase-out risk. For dual-sourcing resilience, the LD39020DTPU33R is a functional second-source candidate — same positive fixed topology, similar protection set, but rated for 200 mA output at 3.3V, not a direct pin-for-pin swap.

Frequently asked questions

What is the equivalent part for LD1117DT25CTR?

The LD39020DTPU33R is a functional second-source candidate from ST — same positive fixed LDO topology, over-current and over-temperature protection, and DPAK package. It is rated for 200 mA at 3.3V output, not 800 mA at 2.5V. Verify the output voltage and load current match your design before substituting.

What are the specifications of LD1117DT25CTR?

It is a positive fixed LDO with 2.5V output, 800mA maximum output current, 1.3V maximum dropout at full load, 75dB PSRR at 120Hz, 10 mA quiescent current, and an operating temperature range of -40°C to 125°C. Package is DPAK (TO-252-3).

Is LD1117DT25CTR compatible with my 3.3V design?

If your design requires a 2.5V rail, yes — the LD1117DT25CTR outputs a fixed 2.5V. The input must be at least 3.8V (2.5V + 1.3V dropout) to maintain regulation at 800 mA. For a 3.3V input, the headroom is only 0.8V, which is below the maximum dropout spec — the output may drop out of regulation under full load. Use a lower-dropout regulator or reduce the load current if running from 3.3V.

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