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Texas Instruments LM317KTTR — Power Management (PMIC / Gate Driver)

LM317KTTR Adjustable Voltage Regulator, 1.5 A, TO-263

MPNLM317KTTR
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Texas Instruments LM317KTTR adjustable positive voltage regulator, 1.5 A output, 40 V input max, 37 V output max, 80 dB ~ 65 dB PSRR at 120 Hz, TO-263-3 DDPAK surface mount, 0°C to 125°C.

$0.8800Ref. price · indicative, final on quote
Texas Instruments LM317KTTR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM317KTTR specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Voltage - input40V
Voltage - output37V
Voltage - output (Min (Fixed))1.25V
Output current1.5A
Current - quiescent10 mA
Operating temperature0°C~125°C
PSRR80dB ~ 65dB (120Hz)
PackageTape & Reel (TR); Cut Tape (CT)
CaseTO-263-4, D²Pak (3 Leads + Tab), TO-263AA
Protection featuresOver Current, Over Temperature, Short Circuit
Number of regulators1
Output configurationPositive

Product details

Adjustable 1.5 A regulator in DDPAK

The Texas Instruments LM317KTTR is a three-terminal adjustable positive voltage regulator delivering up to 1.5 A output current with an output adjustable from 1.25 V to 37 V. Input voltage range extends to 40 V maximum.

80 dB PSRR — ripple rejection for analog loads

PSRR is specified at 80 dB typical at 120 Hz, rolling off to 65 dB at the same frequency. This 120 Hz rejection directly attenuates full-wave-rectified mains ripple, which makes the LM317KTTR a natural fit for powering op-amp rails, ADC reference buffers, or audio preamp stages where supply noise couples into the signal path. The 10 mA quiescent current is typical for this regulator class — not a low-Iq part, so it is best biased with a minimum load to maintain regulation.

The LM317KTTR remains a standard catalog item, qualified for new designs and repeat production orders.

Frequently asked questions

What is the difference between LM317KTTR and LM317T?

The LM317KTTR is the surface-mount DDPAK/TO-263-3 variant, while the LM317T is the through-hole TO-220 package. Electrical specifications — 1.5 A output, 40 V input max, 1.25 V to 37 V output range, PSRR, and protection features — are common across the LM317 family. The package choice depends on the assembly process and thermal management approach.