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STMicroelectronics LD1117SC-R — Power Management (PMIC / Gate Driver)

LD1117SC-R Adjustable LDO 800 mA SOT-223 –

MPNLD1117SC-R
Active

STMicroelectronics LD1117 series, positive adjustable LDO regulator, 800 mA output, 1.25 V to 15 V range, SOT-223 surface-mount package, active production

$0.7800Ref. price · indicative, final on quote
STMicroelectronics LD1117SC-R datasheet (PDF)
PackagingTO-261-4, TO-261AA
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LD1117SC-R specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Voltage - input15V
Voltage dropout1.3V @ 800mA
Voltage - output15V
Voltage - output (Min (Fixed))1.25V
Output current800mA
Current - quiescent5 mA
Operating temperature-40°C~125°C
PSRR75dB (120Hz)
PackageTape & Reel (TR); Cut Tape (CT)
CaseTO-261-4, TO-261AA
Protection featuresOver Current, Over Temperature
Number of regulators1
Output configurationPositive

Product details

Adjustable LDO for 800 mA rails — what the ratings mean

The LD1117SC-R is an adjustable positive LDO from the LD1117 family, delivering up to 800 mA with a dropout voltage of 1.3 V max at that full load. That dropout means your input rail must stay at least 1.3 V above the set output voltage under worst-case current — for a 3.3 V output, Vin must be ≥ 4.6 V. The output adjusts from 1.25 V up to 15 V using two external resistors. PSRR is 75 dB at 120 Hz — strong rejection of the fundamental ripple from a rectified AC line or a switching pre-regulator. For comparison, the ST LDFPVR sibling delivers 62 dB to 55 dB across 120 Hz to 100 kHz, so the LD1117SC-R holds a clear advantage at line-frequency rejection. Quiescent current is 5 mA — not a micropower part, but acceptable for many post-regulation stages where the load current dominates the efficiency budget.

ROHS3 compliant.

Housed in a SOT-223 (TO-261AA) surface-mount package. Protection features include over-current and over-temperature shutdown.

Frequently asked questions

Is LD1117SC-R a direct replacement for LD1117?

The LD1117SC-R is a specific variant of the LD1117 family in the SOT-223 package. The base product number LD1117 covers multiple package options — confirm the footprint matches your PCB before substituting.

What are the closest functional alternatives to LD1117SC-R?

Within ST's portfolio, the LDFPVR (1 A output, 62–55 dB PSRR, with Enable and Power Good) and the LD39020DTPU33R (200 mA fixed output, 80–55 dB PSRR, with Soft Start) serve different current and feature targets. Neither is a drop-in — compare package and pinout against your layout.