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Texas Instruments LM317LIPK — Power Management (PMIC / Gate Driver)

LM317LIPK Texas Instruments Adjustable 100 mA Regulator

MPNLM317LIPK
Active

Texas Instruments LM317LIPK, adjustable positive voltage regulator, 100 mA output, SOT-89-3 (TO-243AA) surface-mount package, PSRR 80 dB to 65 dB at 120 Hz.

$0.9900Ref. price · indicative, final on quote
Texas Instruments LM317LIPK datasheet (PDF)
PackagingTO-243AA
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LM317LIPK specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Voltage - input38V
Voltage - output32V
Voltage - output (Min (Fixed))1.2V
Output current100mA
Current - quiescent2.5 mA
Operating temperature-40°C~125°C
PSRR80dB ~ 65dB (120Hz)
PackageTape & Reel (TR); Cut Tape (CT)
CaseTO-243AA
Protection featuresOver Current, Over Temperature, Short Circuit
Number of regulators1
Output configurationPositive

Product details

What the PSRR rating means for your rail

The LM317LIPK delivers 80 dB of ripple rejection at 120 Hz, dropping to 65 dB as frequency rises — that 80 dB floor at line frequency is the number that matters for post-rectifier smoothing. If your load pulls under 100 mA and you need a clean adjustable rail from a noisy supply, this part handles the filtering without a separate LC stage.

Package and temperature envelope

Housed in the SOT-89-3 (TO-243AA) package, this is a surface-mount regulator with a tab that carries the output — the copper area under the tab sets the thermal resistance.

Protection and quiescent current

Built-in over-current, over-temperature, and short-circuit protection cover the common fault cases without external clamp diodes. Quiescent current is 2.5 mA — not the lowest in class, but acceptable for a 100 mA regulator where the load current dominates the power budget.

The base part number is LM317, and the LIPK suffix denotes the SOT-89-3 package variant.

Frequently asked questions

Is the LM317LIPK a drop-in replacement for the standard TO-220 LM317?

No — the pinout and package are different. The LM317LIPK is an SOT-89-3 surface-mount device, while the classic LM317 comes in a TO-220 through-hole package. The electrical core (adjustable output, 1.2 V reference, 100 mA rating) is the same, but the PCB footprint and thermal management are entirely different. Verify your board layout before substituting.

What is the closest pin-compatible alternative to the LM317LIPK in the same package?

The LM317LIPK is the SOT-89-3 variant of the LM317 family. Within the same SOT-89-3 footprint, the closest functional alternative would be another adjustable positive regulator with the same pinout — for example, the AP1117 series from Diodes Incorporated or the NCP1117 series from ON Semiconductor, though those are rated for higher output current (1 A) and have a different dropout voltage. Always cross-check the pin assignment and thermal pad connection before swapping.