component
LM317C
Public Made by Adomby adom
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm317c.step/lm317c.glbare 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, primaryclaude-haiku-5-5(text), consensusclaude-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).
# 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](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590907295016968192) (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](docs/lm317c-datasheet.pdf)