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Texas Instruments LM317AMDT — Power Management (PMIC / Gate Driver)

LM317AMDT Adjustable Regulator, 1.5A, TO-252-3, NRND

MPNLM317AMDT
NRND

LM317AMDT, adjustable positive voltage regulator, 1.5 A output, 40 V input max, 37 V output max, PSRR 80 dB ~ 65 dB (120 Hz), TO-252-3 surface-mount package, -40 °C to 125 °C operating temperature.

$2.8100Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM317AMDT specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Voltage - input40V
Voltage - output37V
Voltage - output (Min (Fixed))1.25V
Output current1.5A
Current - quiescent10 mA
Operating temperature-40°C~125°C
PSRR80dB ~ 65dB (120Hz)
PackageTube
CaseTO-252-3, DPak (2 Leads + Tab), SC-63
Protection featuresOver Current, Over Temperature, Short Circuit
Number of regulators1
Output configurationPositive

Product details

No official successor part is listed on the record.

1.5 A adjustable output — what it covers

This is a single-output positive adjustable linear regulator with a 1.5 A current rating. The output range is 1.25 V minimum to 37 V maximum, with a 40 V maximum input.

PSRR and protection — why the 80 dB matters

The PSRR is specified at 80 dB typical at 120 Hz, dropping to 65 dB at higher frequencies. That 80 dB at line frequency gives you solid ripple rejection from a rectified AC supply — useful if you are feeding a sensitive analog front-end or an ADC reference. The built-in over-current, over-temperature, and short-circuit protection mean it will survive a bench fault or a field overload without letting the magic smoke out.

TO-252-3 — surface-mount swap on site

The package is TO-252-3 (DPak), a surface-mount part with a tab for heat sinking. It is not socket-friendly, so a field swap means hot air or a soldering iron with a large tip. The tab is the output pin, so the board copper pour is part of the thermal path. Orientation is straightforward — the tab is the big metal pad, and the three leads are in a row. If you are carrying a field kit, bring a pre-tinned replacement and a hot-air station; this is not a part you swap with tweezers and a soldering iron on a customer site without a bench.

Frequently asked questions

Is LM317AMDT obsolete?

That means it is still available for existing production but is on the path to end-of-life. Plan a replacement for any new design.

What is the replacement for LM317AMDT?

No official successor is listed on the record. A functionally equivalent replacement would be a standard LM317 adjustable regulator in a compatible package — such as the LM317MDT or LM317T in TO-220, depending on your board footprint and thermal requirements.

What is the difference between LM317AMDT and LM317?

The LM317AMDT is a specific surface-mount variant in the TO-252-3 (DPak) package, while the base LM317 part number covers multiple package options including the through-hole TO-220. The electrical specs — 1.5 A output, 1.25 V to 37 V adjustable range, 40 V input max — are the same across the family. The 'A' suffix typically denotes a tighter initial tolerance or a higher-grade temperature range; this one is rated -40 °C to 125 °C.