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LM317C

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Changjing Voltage Reference, TO-252-2L. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LM317C

Changjing · Voltage Reference · TO-252-2L

LM317C from Changjing, in a TO-252-2L. 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 ADJ passive Adjustment pin: connect it to the resistor divider that sets VOUT; the ADJUST terminal current IADJ is typically 50µA and at most 100µA.
2 OUT output Voltage output pin, delivering up to 1.5A, with a minimum load current of 10mA (max) needed to maintain regulation.
3 IN input Supply input pin; the input-to-output differential VIN - VOUT must be at least 3.0V and must not exceed 40V.

Key specifications

Parameter Value
Manufacturer Changjing
Package TO-252-2L
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
Line regulation LNR 0.01 0.04 %/V VIN - VOUT = 3.0 to 40V, TJ = 25°C 6
Line regulation LNR 0.02 0.07 %/V VIN - VOUT = 3.0 to 40V, TJ = 0 to 125°C 6
Load regulation (VOUT < 5.0V) LDR 5 25 mV IOUT = 10 to 1500mA, VOUT < 5.0V, TJ = 25°C 6
Load regulation (VOUT < 5.0V) LDR 20 70 mV IOUT = 10 to 1500mA, VOUT < 5.0V, TJ = 0 to 125°C 6
Load regulation (VOUT ≥ 5.0V) LDR 0.1 0.5 %·VOUT IOUT = 10 to 1500mA, VOUT ≥ 5.0V, TJ = 25°C 6
Load regulation (VOUT ≥ 5.0V) LDR 0.3 1.5 %·VOUT IOUT = 10 to 1500mA, VOUT ≥ 5.0V, TJ = 0 to 125°C 6
ADJUST terminal current IADJ 50 100 μA TJ = 25°C 6
Change in ADJUST terminal current ΔIADJ 0.2 5 μA VIN - VOUT = 2.5 to 40V, IOUT = 10 to 1500mA, TJ = 25°C 6
Reference voltage VREF 1.2 1.25 1.3 V VIN - VOUT = 3.0 to 40V, IOUT = 10 to 1500mA, TJ = 25°C 6
Line regulation of reference voltage LNR VREF 0.02 0.07 %/V VIN - VOUT = 3.0 to 40V, TJ = 25°C 6
Load regulation of reference voltage (VOUT < 5.0V) LDR VREF 20 70 mV IOUT = 10 to 1500mA, VOUT < 5.0V, TJ = 25°C 6
Load regulation of reference voltage (VOUT ≥ 5.0V) LDR VREF 0.3 1.5 %·VOUT IOUT = 10 to 1500mA, VOUT ≥ 5.0V, TJ = 25°C 6
Minimum load current to maintain regulation IOUT MIN 3.5 10 mA VIN - VOUT = 40V, TJ = 0 to 125°C 6
Maximum output current IOUT MAX 1.5 2.2 A VIN - VOUT ≤ 15V, TJ = 0 to 125°C 6
Maximum output current IOUT MAX 0.15 0.4 A VIN - VOUT = 40V, TJ = 25°C 6
Maximum input-to-output differential voltage VIN - VOUT 40 V 4
Programmable output voltage range VOUT 37 V 4
Maximum junction temperature TJ Max 150 °C 4
Storage temperature Tstg -65 150 °C 4
Soldering temperature Tsolder 260 °C 10s 4
Input-to-output differential voltage VIN - VOUT 3 40 V 4
Programmable output voltage VOUT 1.25 37 V 4
Output current range IOUT 0.01 1.5 A 4
Operating junction temperature TJ -40 125 °C 4
Junction-to-ambient thermal resistance (TO-252-2L) RΘJA 80 °C/W TO-252-2L; still air, TA = 25°C, installed on 1 in² FR-4 board with 2 oz copper 5
Junction-to-case thermal resistance (TO-252-2L) RΘJC 14.5 °C/W TO-252-2L 5
Maximum power dissipation for continuous operation (TO-252-2L) PD Ref 1.25 W TO-252-2L; still air, TA = 25°C, installed on 1 in² FR-4 board with 2 oz copper 5

CAD (KiCad official)

  • Symbol: LM317C
  • Footprint: Package_TO_SOT_SMD:TO-252-2
  • 3D model: TO-252-2L (KiCad packages3D, STEP)
  • 3D model files: lm317c-etched.step / lm317c-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm317c.step / lm317c.glb are the bare package body.

Provenance

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

  • Datasheet: Changjing datasheet (22 pp, sha256 14970e7c883446f9, retrieved 2026-10-18, 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