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Texas Instruments LM2937ES-12-TI — Analog & Data Acquisition

LM2937ES-12-TI 12V Fixed 500mA LDO, DDPAK, -40 to 125°C

MPNLM2937ES-12-TI
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Texas Instruments LM2937ES-12-TI, 12V fixed-output LDO, 500mA output, DDPAK/TO-263-3 surface-mount, -40°C to 125°C operating range, over-temp and short-circuit protection.

Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM2937ES-12-TI specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input26V
Voltage dropout1V @ 50mA
Voltage - output (Min (Fixed))12V
Output current500mA
Current - supply20 mA
Current - quiescent2 mA
Operating temperature-40°C~125°C
PackageTube
CaseTO-263-4, D²Pak (3 Leads + Tab), TO-263AA
Protection featuresOver Temperature, Reverse Polarity, Short Circuit
Number of regulators1
Output configurationPositive

Product details

12 V fixed rail for industrial and automotive loads

It comes in a DDPAK/TO-263-3 surface-mount package — the tab is the output and needs a decent copper pour for thermal relief.

Dropout and quiescent — the real-world numbers

Maximum dropout is 1 V at 50 mA load. That means with a 13 V input you still get regulation at light load; at full 500 mA the dropout will be higher, so budget at least 14.5 V input to stay out of dropout. Input voltage max is 26 V — plenty of headroom for a nominal 24 V industrial supply or a 12 V battery charging at 14.4 V.

Built-in protections cut external BOM

Over-temperature, reverse polarity, and short-circuit protection are all on-chip. In a motor-drive or solenoid-heavy environment where the 12 V rail sees transients and accidental reverse-battery events, these save a Schottky diode and a PTC. The short-circuit protection folds back current, so the regulator survives a dead short without letting the magic smoke out.

Frequently asked questions

What is the closest pin-compatible alternative to LM2937ES-12-TI in this component family?

The LM2937ET-12 is a through-hole TO-220 variant with the same 12 V fixed output and 500 mA rating. The pinout differs — the DDPAK tab is output, while the TO-220 tab is ground — so they are not drop-in replacements.

Can I use LM2937ES-12-TI in automotive (or high-temperature) environments?

Yes. The DDPAK package with its exposed tab handles the thermal dissipation for 500 mA loads in those environments, provided the PCB copper area is adequate.

Does LM2937ES-12-TI require external capacitors for stability?

Yes, like most LDOs it needs input and output capacitors for stability. The datasheet (not included in this listing) specifies typical values — an output capacitor with low ESR is recommended to maintain phase margin. The protection features (over-temp, short-circuit) are internal and do not require external components.