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STMicroelectronics LD1117DT33TR — Analog & Data Acquisition

LD1117DT33TR – STMicro 3.3V 800mA LDO, DPAK, Active

MPNLD1117DT33TR
Active

STMicroelectronics LD1117DT33TR, fixed 3.3 V positive LDO, 800 mA output, 1.2 V max dropout, 75 dB PSRR at 120 Hz, DPAK surface-mount package, active production.

$0.9400Ref. price · indicative, final on quote
STMicroelectronics LD1117DT33TR 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

LD1117DT33TR specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input15V
Voltage dropout1.2V @ 800mA
Voltage - output (Min (Fixed))3.3V
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

The LD1117DT33TR is a fixed 3.3 V positive LDO from STMicroelectronics rated for 800 mA continuous output. Dropout is specified at 1.2 V maximum at 800 mA, so the input must stay above 4.5 V to hold regulation at full load. Quiescent current is 10 mA typical, which is moderate for this output class — budget it in the system standby current.

DPAK package and thermal routing

The tab is the output (Vout) node, so the copper area is at 3.3 V — keep it isolated from the ground plane. The protection block includes over-current and over-temperature shut-down.

Active production – ordering and lifecycle

ROHS3 compliant. The tape-and-reel suffix (TR) means it ships on a 13-inch reel; cut-tape options are also available for prototyping. We source through multiple distribution channels and can quote against your BOM quantity — confirm the volume and target delivery window at quote time.

Frequently asked questions

Can I replace the LD1117DT33TR with an AMS1117-3.3?

Both are fixed 3.3 V LDOs in a DPAK footprint, so the pinout is compatible. The AMS1117-3.3 is rated for 1 A output versus 800 mA, and its dropout is typically lower (1.1 V max at 800 mA). However, the AMS1117 is not a direct STMicroelectronics part — verify the operating temperature range and PSRR against your application requirements before substituting.