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STMicroelectronics L4940D2T10 — Analog & Data Acquisition

STMicroelectronics L4940D2T10 10V Fixed LDO, 1.5A, TO-263-3

MPNL4940D2T10
Obsolete

STMicroelectronics L4940D2T10, fixed 10V output LDO, 1.5A, 0.9V dropout max, PSRR 62dB at 120Hz, TO-263-3 D2PAK, -40°C to 150°C, over temp/reverse/short protection.

STMicroelectronics L4940D2T10 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

L4940D2T10 specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input17V
Voltage dropout0.9V @ 1.5A
Voltage - output (Min (Fixed))10V
Output current1.5A
Current - supply50 mA
Current - quiescent8 mA
Operating temperature-40°C ~ 150°C
PSRR62dB (120Hz)
PackageTube
CaseTO-263-3, D²Pak (2 Leads + Tab), TO-263AB
Protection featuresOver Temperature, Reverse Polarity, Short Circuit
Number of regulators1
Output configurationPositive

Product details

Fixed 10V 1.5A LDO for harsh environments

The STMicroelectronics L4940D2T10 is a fixed 10V output, positive-voltage linear regulator delivering 1.5A continuous current in a TO-263-3 (D2PAK) surface-mount package. It integrates over-temperature, reverse-polarity, and short-circuit protection, making it suited for automotive and industrial power rails where a stable 10V bus is needed and board area is tight.

Maximum dropout voltage is 0.9V at 1.5A load, so the input must stay above 10.9V to maintain regulation. PSRR is 62dB at 120Hz, which provides roughly 1 mV ripple rejection per volt of ripple at the input — useful when the LDO follows a full-wave rectifier without active filtering.

Obsolescence and sourcing reality

The L4940D2T10 is officially obsolete per the manufacturer.

Temperature range and protection set

The integrated protection — over-temperature, reverse polarity, and short circuit — reduces external clamp and shutdown circuitry, simplifying the BOM for a rugged 10V rail.

Frequently asked questions

Is L4940D2T10 obsolete?

Prevents design-in of a part that may become unavailable, affecting production continuity.

What is the replacement for L4940D2T10?

Essential for BOM revision when the original part is no longer manufactured.

What is the pinout of L4940D2T10?

Needed for design validation and correct PCB layout for the specific package.

What is the price of L4940D2T10?

Critical for cost estimation in BOM building and sourcing decisions.

Where can I buy L4940D2T10?

Directs buyers to available channels, especially important for obsolete parts.

What is the equivalent of L4940D2T10 from other manufacturers?

Allows cross-sourcing to secure supply and reduce dependency on single brand.