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STMicroelectronics LD1117DT33CTR — Power Management (PMIC / Gate Driver)

LD1117DT33CTR — STMicro 3.3V 800mA LDO, DPAK, Active

MPNLD1117DT33CTR
Active

STMicroelectronics LD1117DT33CTR, a positive fixed-output LDO regulator, 3.3 V at 800 mA, DPAK surface-mount package, 75 dB PSRR at 120 Hz.

$0.6000Ref. price · indicative, final on quote
STMicroelectronics LD1117DT33CTR datasheet (PDF)
PackagingTO-252-3, DPak (2 Leads + Tab), SC-63
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LD1117DT33CTR specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input15V
Voltage dropout1.3V @ 800mA
Voltage - output (Min (Fixed))3.3V
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

Product details

What the 75 dB PSRR means for your rail

The LD1117DT33CTR delivers 75 dB PSRR at 120 Hz — that is the ripple rejection a designer needs when post-regulating a 50/60 Hz rectified supply or a switching regulator output for a sensitive analog or RF load. The 1.3 V max dropout at 800 mA sets the input-to-output headroom: you need at least 4.6 V on the input to hold 3.3 V at full current.

Dropout and quiescent current at the BOM level

At 800 mA output, the 10 mA quiescent current is the overhead the input supply must cover — it is not negligible in battery-powered designs but is typical for a general-purpose LDO at this current. The over-current and over-temperature protection are built in, so no external current-limit resistor is needed.

Frequently asked questions

Is LD1117DT33CTR equivalent to LD1117DT33TR?

The LD1117DT33CTR and LD1117DT33TR share the same base product number and electrical ratings — both are 3.3 V fixed, 800 mA LDOs in DPAK. The suffix difference is packaging: CT indicates Cut Tape, TR indicates Tape & Reel. Functionally identical; the BOM position accepts either reel format.