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STMicroelectronics LD1085V50 — Power Management (PMIC / Gate Driver)

ST LD1085V50 Linear Regulator, 5V Fixed, 3A, TO-220-3

MPNLD1085V50
End of Life

ST LD1085V50 linear voltage regulator, fixed 5V output, 3A, 1.5V dropout at 3A, 72dB PSRR at 120Hz, TO-220-3, -40°C to 125°C, active.

$1.86Ref. price · indicative, final on quote
STMicroelectronics LD1085V50 datasheet (PDF)
PackagingTO-220-3
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LD1085V50 specifications
ParameterValue
Output typeFixed
MountingThrough Hole
Voltage - input30V
Voltage dropout1.5V @ 3A
Voltage - output (Min (Fixed))5V
Output current3A
Current - quiescent10 mA
Operating temperature-40°C ~ 125°C
PSRR72dB (120Hz)
PackageTube
CaseTO-220-3
Protection featuresOver Current, Over Temperature
Number of regulators1
Output configurationPositive

Product details

PSRR and ripple rejection

With 72 dB PSRR at 120 Hz, this part knocks down full-wave-rectified ripple. That is adequate for a clean analog supply from a linear transformer front-end, but the PSRR rolls off above a few kilohertz — do not rely on it for post-regulation after a switching converter without additional LC filtering.

The TO-220-3 through-hole package with a metal tab is the standard power regulator footprint. The tab is electrically connected to the output pin; if you bolt it to a grounded heatsink, use an insulating pad and thermal grease.

Protection and lifecycle

Built-in over-current and over-temperature protection are standard for this class of regulator — the part folds back current or shuts down before damage occurs.

Frequently asked questions

What is the closest pin-compatible alternative to LD1085V50?

The LD1085V50 is a fixed 5 V output variant in the LD1085 family. Pin-compatible alternatives include the LD1085V (adjustable output) and other fixed-voltage versions (e.g., LD1085V33 for 3.3 V, LD1085V18 for 1.8 V) in the same TO-220-3 package — all share the same footprint and pinout, so a board designed for the V50 can accept any of them with a voltage change.

Can I use LD1085V50 as a replacement for another 5V regulator?

Yes, if the existing regulator is a 5 V fixed positive linear regulator in a TO-220-3 package with a 3 A or lower rating and similar dropout. Check that the input voltage range (max 30 V) and pinout match — the LD1085V50 uses the standard TO-220 pinout (input, ground, output). Verify the load current does not exceed 3 A and that the dropout headroom is sufficient.