component
LM317D2T-TR
Public Made by Adomby adom
STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-263-2. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLM317D2T-TR
STMicroelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-263-2
LM317D2T-TR from STMicroelectronics, in a TO-263-2. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | ADJUST | bidirectional | Adjustment terminal that sets the constant 1.25 V reference across external resistor R1; draws a typical 50 µA (max 100 µA) adjustment-pin current with only 0.2-5 µA change over line/load, used with an external resistor divider to program VO = VREF(1+R2/R1) + IADJ·R2. |
| 2 | OUTPUT | power_out | Regulated output terminal, internally referenced 1.25 V (1.2-1.3 V typ) above the ADJUST pin; delivers output current in excess of 1.5 A (up to 2.2 A max for VI-VO ≤15 V) and is electrically the same net as the package tab used for heat-sinking. |
| 3 | INPUT | power_in | Unregulated input supply terminal; the input-to-output differential voltage (VI-VO) must not exceed the 40 V absolute maximum rating, with electrical characteristics specified at VI-VO = 5 V and a 2.5-40 V operating differential range. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | TO-263-2 |
| 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 | ΔVO | 0.01 | 0.04 | %/V | VI - VO = 3 to 40 V, TJ = 25°C | 7 | |
| Line regulation | ΔVO | 0.02 | 0.07 | %/V | VI - VO = 3 to 40 V | 7 | |
| Load regulation (VO ≤ 5 V) | ΔVO | 5 | 25 | mV | VO ≤ 5 V, IO = 10 mA to IMAX, TJ = 25°C | 7 | |
| Load regulation (VO ≤ 5 V) | ΔVO | 20 | 70 | mV | VO ≤ 5 V, IO = 10 mA to IMAX | 7 | |
| Load regulation (VO ≥ 5 V) | ΔVO | 0.1 | 0.5 | % | VO ≥ 5 V, IO = 10 mA to IMAX, TJ = 25°C | 7 | |
| Load regulation (VO ≥ 5 V) | ΔVO | 0.3 | 1.5 | % | VO ≥ 5 V, IO = 10 mA to IMAX | 7 | |
| Adjustment pin current | IADJ | 50 | 100 | µA | 7 | ||
| Adjustment pin current change | ΔIADJ | 0.2 | 5 | µA | VI - VO = 2.5 to 40 V, IO = 10 mA to 500 mA | 7 | |
| Reference voltage (between pin 3 and pin 1) | VREF | 1.2 | 1.25 | 1.3 | V | VI - VO = 2.5 to 40 V, IO = 10 mA to 500 mA, PD ≤ PMAX | 7 |
| Output voltage temperature stability | ΔVO/VO | 1 | % | 7 | |||
| Minimum load current | IO(min) | 3.5 | 10 | mA | VI - VO = 40 V | 7 | |
| Maximum load current | IO(max) | 1.5 | 2.2 | A | VI - VO ≤ 15 V, PD < PMAX | 7 | |
| Maximum load current | IO(max) | 0.4 | A | VI - VO = 40 V, PD < PMAX, TJ = 25°C | 7 | ||
| Output noise voltage (percentage of VO) | eN | 0.003 | % | B = 10 Hz to 100 kHz, TJ = 25°C | 7 | ||
| Supply voltage rejection (CADJ = 0) | SVR | 65 | dB | TJ = 25°C, f = 120 Hz, CADJ = 0 | 7 | ||
| Supply voltage rejection (CADJ = 10 µF) | SVR | 66 | 80 | dB | TJ = 25°C, f = 120 Hz, CADJ = 10 µF | 7 | |
| Input-reference differential voltage | VI - VO | 40 | V | 4 | |||
| Operating junction temperature (LM317) | TOP | 0 | 125 | °C | LM317 grade | 4 | |
| Storage temperature | TSTG | -65 | 150 | °C | 4 | ||
| Thermal resistance junction-case (D²PAK) | RthJC | 3 | °C/W | D²PAK package | 4 | ||
| Thermal resistance junction-ambient (D²PAK) | RthJA | 62.5 | °C/W | D²PAK package | 4 |
CAD (KiCad official)
- Symbol:
LM317D2T-TR - Footprint:
Package_TO_SOT_SMD:TO-263-2 - 3D model: TO-263-2 (KiCad packages3D, STEP)
- 3D model files:
lm317d2t-tr-etched.step/lm317d2t-tr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm317d2t-tr.step/lm317d2t-tr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (25 pp, sha256
6c20f995e97f5cb4, retrieved 2026-09-23, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-sonnet-5(text+vision), consensusclaude-opus-4-8(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).