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STMicroelectronics LD1117V50C — Analog & Data Acquisition

LD1117V50C — STMicro 5V 800mA LDO, TO-220, Obsolete

MPNLD1117V50C
Obsolete

STMicroelectronics LD1117V50C, fixed 5V output, 800 mA LDO regulator, 75 dB PSRR at 120 Hz, TO-220-3 through-hole package, -40°C to 125°C operating range.

$0.7700Ref. price · indicative, final on quote
STMicroelectronics LD1117V50C datasheet (PDF)
PackagingTO-220-3
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LD1117V50C specifications
ParameterValue
Output typeFixed
MountingThrough Hole
Voltage - input15V
Voltage dropout1.3V @ 800mA
Voltage - output (Min (Fixed))5V
Output current800mA
Current - quiescent10 mA
Operating temperature-40°C ~ 125°C
PSRR75dB (120Hz)
PackageTube
CaseTO-220-3
Protection featuresOver Current, Over Temperature
Number of regulators1
Output configurationPositive

Product details

5V fixed rail, 800 mA — TO-220 through-hole LDO

The LD1117V50C is a fixed 5V output, 800 mA low-dropout regulator from STMicroelectronics in a TO-220-3 through-hole package. Maximum dropout voltage is 1.3V at the full 800 mA load, so the input rail needs at least 6.3V to maintain regulation under worst-case conditions. Quiescent current runs 10 mA — not a micropower part, but acceptable for always-on rails where the load current dominates the thermal budget.

1.3V dropout at 800 mA — headroom and thermal reality

At 800 mA output with 1.3V dropout, the regulator dissipates about 1.04 W. The TO-220 package with a heatsink tab can handle that, but without a copper-land heatsink on the PCB the junction will climb above 125°C quickly. Protection features include over-current and over-temperature shutdown — both are the latch-off type, so a sustained short will cycle the output until the fault clears.

STMicroelectronics lists the LD1117V50C as Obsolete. The TO-220-3 footprint is standard, so a pin-compatible second-source search is practical if the volume justifies qualification.

Frequently asked questions

How can I order LD1117V50C or request a quote?

The LD1117V50C is obsolete per STMicroelectronics. We source it through independent distribution against your BOM quantity. Submit an RFQ with your target volume and lead-time window; we confirm availability and current pricing at quote time. No stock-holding claim is made — every order is sourced per request.

How does LD1117V50C compare to LD1117V33?

Both are from the same LD1117 base family and share the same TO-220-3 package, 800 mA output, dropout, protection features, and operating temperature range. The difference is the fixed output voltage: LD1117V50C outputs 5V, while LD1117V33 outputs 3.3V. They are not pin-compatible replacements for each other unless the downstream circuitry can tolerate the voltage change.

What is LD1117V50C's PSRR?

75 dB at 120 Hz. This is the ripple rejection at mains frequency — a 1Vpp ripple on the input is attenuated to about 0.18 mVpp on the output. This matters when the regulator feeds analog or mixed-signal circuitry from a rectified and lightly filtered supply.