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STMicroelectronics L4940D2T5-TR — Analog & Data Acquisition

STMicroelectronics L4940D2T5-TR Linear Regulator

MPNL4940D2T5-TR
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STMicroelectronics L4940 series, L4940D2T5-TR, Linear Regulator, Fixed 5V output, 1.5A, Positive, 17V max input, D2PAK-3, -40°C to 150°C.

$2.0500Ref. price · indicative, final on quote
STMicroelectronics L4940D2T5-TR datasheet (PDF)
PackagingTO-263-3, D2PAK (2 Leads + Tab), TO-263AB
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

L4940D2T5-TR specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input17V
Voltage dropout0.9V @ 1.5A
Voltage - output (Min (Fixed))5V
Output current1.5A
Current - supply50 mA
Current - quiescent8 mA
Operating temperature-40°C ~ 150°C
PSRR68dB (120Hz)
PackageTape & Reel (TR) Cut Tape (CT)
CaseTO-263-3, D2PAK (2 Leads + Tab), TO-263AB
Protection featuresOver Temperature, Reverse Polarity, Short Circuit
Number of regulators1
Output configurationPositive

Product details

5V rail, 1.5A capability — what this LDO delivers

The STMicroelectronics L4940D2T5-TR is a fixed 5V, 1.5A positive linear regulator in a D2PAK (TO-263-3) surface-mount package. It is designed for applications requiring a clean, regulated 5V rail from an unregulated DC supply up to 17V — typical in automotive ECUs, industrial control boards, and post-regulator stages in multi-rail power supplies. PSRR is 68 dB at 120 Hz, a relevant figure for rejecting rectified mains ripple in industrial power supplies. The part includes over-temperature, reverse polarity, and short-circuit protection, reducing the need for external protection diodes and crowbar circuits.

No last-time-buy or obsolescence risk is indicated.

Frequently asked questions

Is L4940D2T5-TR equivalent to L4940V5?

Electrically equivalent — same 5V 1.5A regulator die. The L4940V5 is the through-hole TO-220 version; the L4940D2T5-TR is the surface-mount D2PAK variant. They are not pin-compatible but serve the same function on different PCB layouts.