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LM317MSTT3G

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onsemi DC-DC Converters, SOT-223-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LM317MSTT3G

onsemi · DC-DC Converters · SOT-223-3

LM317MSTT3G from onsemi, in a SOT-223-3. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 ADJUST input Adjustment terminal sets the output voltage through the R1/R2 divider; IAdj is controlled to less than 100 µA, and an optional CAdj from this pin to ground improves ripple rejection.
2 VOUT power_out Regulated output of the adjustable regulator, adjustable from 1.2 V to 37 V and capable of supplying more than 500 mA; the heatsink surface is connected to this pin.
3 VIN power_in Unregulated input supply; the input-output voltage differential must not exceed 40 Vdc, and a 0.1 µF input bypass capacitor (Cin) is recommended when the regulator is far from the supply filter.

Key specifications

Parameter Value
Manufacturer onsemi
Package SOT-223-3
Category Power Management (PMIC)
Pins 3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Input-Output Voltage Differential VI−VO 40 Vdc 2
Maximum Junction Temperature TJMAX 150 °C 2
Storage Temperature Range Tstg -65 150 °C 2
Line Regulation Regline 0.01 0.04 %/V TA = 25°C, 3.0 V ≤ VI − VO ≤ 40 V 2
Load Regulation (VO ≤ 5.0 V) Regload 5 25 mV TA = 25°C, 10 mA ≤ IO ≤ 0.5 A, VO ≤ 5.0 V 2
Load Regulation (VO ≥ 5.0 V) Regload 0.1 0.5 % VO TA = 25°C, 10 mA ≤ IO ≤ 0.5 A, VO ≥ 5.0 V 2
Adjustment Pin Current IAdj 50 100 μA 2
Adjustment Pin Current Change IAdj 0.2 5 μA 2.5 V ≤ VI − VO ≤ 40 V, 10 mA ≤ IL ≤ 0.5 A, PD ≤ Pmax 2
Reference Voltage Vref 1.2 1.25 1.3 V 3.0 V ≤ VI − VO ≤ 40 V, 10 mA ≤ IL ≤ 0.5 A, PD ≤ Pmax 2
Line Regulation Regline 0.02 0.07 %/V 3.0 V ≤ VI−VO ≤ 40 V (Note 3) 2
Load Regulation (VO ≤ 5.0 V) Regload 20 70 mV 10 mA ≤ IO ≤ 0.5 A (Note 3), VO ≤ 5.0 V 2
Load Regulation (VO ≥ 5.0 V) Regload 0.3 1.5 % VO 10 mA ≤ IO ≤ 0.5 A (Note 3), VO ≥ 5.0 V 2
Minimum Load Current to Maintain Regulation ILmin 3.5 10 mA VI − VO = 40 V 2
Maximum Output Current (VI − VO ≤ 15 V) Imax 0.5 0.9 A VI − VO ≤ 15 V, PD ≤ Pmax 2
Maximum Output Current (VI − VO = 40 V) Imax 0.15 0.25 A VI − VO = 40 V, PD ≤ Pmax, TA = 25°C 2
Ripple Rejection (without CAdj) RR 66 80 dB VO = 10 V, f = 120 Hz (Note 4), without CAdj 2
Ripple Rejection (CAdj = 10 μF) RR 65 80 dB VO = 10 V, f = 120 Hz (Note 4), CAdj = 10 μF 2
Long-Term Stability S 0.3 1 %/1.0 kHrs. TJ = Thigh (Note 6); TA = 25°C for End-point Measurements 2
Operating Junction Temperature Range (LM317M) TJ 0 125 °C Tlow to Thigh = 0° to +125°C for LM317M (Note 2) 2
Thermal Resistance, Junction-to-Air (SOT-223, ST suffix) θJA 245 °C/W ST Suffix, Case 318E, TA = 25°C 2
Thermal Resistance, Junction-to-Case (SOT-223, ST suffix) θJC 15 °C/W ST Suffix, Case 318E 2

CAD (KiCad official)

  • Symbol: LM317MSTT3G
  • Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
  • 3D model: SOT-223-3 (KiCad packages3D, STEP)
  • 3D model files: lm317mstt3g-etched.step / lm317mstt3g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm317mstt3g.step / lm317mstt3g.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: onsemi datasheet (16 pp, sha256 353819a8f6b59994, retrieved 2026-10-09, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF