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LM317AL-TA3-T
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UTC(Unisonic Tech) Linear Voltage Regulators (LDO), TO-220. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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LM317AL-TA3-T
UTC(Unisonic Tech) · Linear Voltage Regulators (LDO) · TO-220
LM317AL-TA3-T from UTC(Unisonic Tech), in a TO-220. 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 terminal that sets the output voltage via the R1/R2 divider (VOUT=1.25V×(1+R2/R1)+IADJ×R2), with adjustable pin current of 50 µA typ and 100 µA max. |
| 2 | VOUT | power_out | Regulated output terminal, adjustable from 1.2V to 37V and supplying output current in excess of 1.5A. |
| 3 | VIN | power_in | Unregulated input terminal, with a maximum input-output voltage differential of 40V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UTC(Unisonic Tech) |
| Package | TO-220 |
| Category | Power Supply Chip |
| 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 |
|---|---|---|---|---|---|---|---|
| Reference Voltage | VREF | 1.2 | 1.25 | 1.3 | V | 3V≤VIN-VOUT≤40V, 10mA≤IOUT≤1.5A, PD<PMAX | 3 |
| Ripple Rejection | RR | 66 | 80 | dB | VOUT=10V, f=120Hz, CADJ=10μF | 3 | |
| Maximum Output Current | IO(MAX) | 1.5 | 2.2 | A | VIN-VOUT=15V, PD<PMAX | 3 | |
| Line Regulation | ∆VOUT/VOUT | 0.01 | 0.04 | %/V | 3V≤VIN-VOUT≤40V, IOUT=100mA | 3 | |
| Load Regulation (VOUT≤5V) | ∆VOUT | 5 | 25 | mV | 10mA≤IOUT≤1.5A, VOUT≤5V | 3 | |
| Load Regulation (VOUT≥5V) | ∆VOUT | 0.1 | 0.5 | % | 10mA≤IOUT≤1.5A, VOUT≥5V | 3 | |
| Adjustable Pin Current | IADJ | 50 | 100 | μA | 3 | ||
| Adjustable Pin Current Change | ∆IADJ | 0.2 | 5 | μA | 3V≤VIN-VOUT≤40V, 10mA≤IOUT≤500mA | 3 | |
| Minimum Load Current for Regulation | IL(MIN) | 4.5 | mA | VIN-VOUT=40V | 3 | ||
| Maximum Output Current | IO(MAX) | 0.3 | 0.4 | A | VIN-VOUT=40V, PD≤PMAX | 3 | |
| Temperature Stability | 0.7 | %/VOUT | TMIN≤TJ≤TMAX | 3 | |||
| RMS Noise | eN | 0.003 | %/VOUT | 10Hz≤f≤10kHz | 3 | ||
| Ripple Rejection | RR | 65 | dB | VOUT=10V, f=120Hz, CADJ=0 | 3 | ||
| Input-Output Voltage Differential | VIN-VOUT | 40 | V | 3 | |||
| Junction Temperature | TJ | 150 | °C | 3 | |||
| Operating Temperature | TOPR | -40 | 125 | °C | 3 | ||
| Storage Temperature | TSTG | -65 | 150 | °C | 3 | ||
| Thermal Resistance Junction to Ambient | θJA | 50 | °C/W | TO-220 | 3 | ||
| Thermal Resistance Junction to Case | θJC | 5 | °C/W | TO-220 | 3 |
CAD (KiCad official)
- Symbol:
LM317AL-TA3-T - Footprint:
Package_TO_SOT_THT:TO-220-3_Vertical - 3D model: TO-220 (KiCad packages3D, STEP)
- 3D model files:
lm317al-ta3-t-etched.step/lm317al-ta3-t-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm317al-ta3-t.step/lm317al-ta3-t.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UTC(Unisonic Tech) datasheet (5 pp, sha256
03e0560656b59da8, retrieved 2026-10-22, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).
# LM317AL-TA3-T
**UTC(Unisonic Tech)** · Linear Voltage Regulators (LDO) · TO-220
LM317AL-TA3-T from UTC(Unisonic Tech), in a TO-220. 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 terminal that sets the output voltage via the R1/R2 divider (VOUT=1.25V×(1+R2/R1)+IADJ×R2), with adjustable pin current of 50 µA typ and 100 µA max. |
| 2 | VOUT | power_out | Regulated output terminal, adjustable from 1.2V to 37V and supplying output current in excess of 1.5A. |
| 3 | VIN | power_in | Unregulated input terminal, with a maximum input-output voltage differential of 40V. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UTC(Unisonic Tech) |
| Package | TO-220 |
| Category | Power Supply Chip |
| 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 |
|---|---|---|---|---|---|---|---|
| Reference Voltage | VREF | 1.2 | 1.25 | 1.3 | V | 3V≤VIN-VOUT≤40V, 10mA≤IOUT≤1.5A, PD<PMAX | 3 |
| Ripple Rejection | RR | 66 | 80 | | dB | VOUT=10V, f=120Hz, CADJ=10μF | 3 |
| Maximum Output Current | IO(MAX) | 1.5 | 2.2 | | A | VIN-VOUT=15V, PD<PMAX | 3 |
| Line Regulation | ∆VOUT/VOUT | | 0.01 | 0.04 | %/V | 3V≤VIN-VOUT≤40V, IOUT=100mA | 3 |
| Load Regulation (VOUT≤5V) | ∆VOUT | | 5 | 25 | mV | 10mA≤IOUT≤1.5A, VOUT≤5V | 3 |
| Load Regulation (VOUT≥5V) | ∆VOUT | | 0.1 | 0.5 | % | 10mA≤IOUT≤1.5A, VOUT≥5V | 3 |
| Adjustable Pin Current | IADJ | | 50 | 100 | μA | | 3 |
| Adjustable Pin Current Change | ∆IADJ | | 0.2 | 5 | μA | 3V≤VIN-VOUT≤40V, 10mA≤IOUT≤500mA | 3 |
| Minimum Load Current for Regulation | IL(MIN) | | | 4.5 | mA | VIN-VOUT=40V | 3 |
| Maximum Output Current | IO(MAX) | 0.3 | 0.4 | | A | VIN-VOUT=40V, PD≤PMAX | 3 |
| Temperature Stability | | | 0.7 | | %/VOUT | TMIN≤TJ≤TMAX | 3 |
| RMS Noise | eN | | 0.003 | | %/VOUT | 10Hz≤f≤10kHz | 3 |
| Ripple Rejection | RR | | 65 | | dB | VOUT=10V, f=120Hz, CADJ=0 | 3 |
| Input-Output Voltage Differential | VIN-VOUT | | | 40 | V | | 3 |
| Junction Temperature | TJ | | | 150 | °C | | 3 |
| Operating Temperature | TOPR | -40 | | 125 | °C | | 3 |
| Storage Temperature | TSTG | -65 | | 150 | °C | | 3 |
| Thermal Resistance Junction to Ambient | θJA | | 50 | | °C/W | TO-220 | 3 |
| Thermal Resistance Junction to Case | θJC | | 5 | | °C/W | TO-220 | 3 |
## CAD (KiCad official)
- Symbol: `LM317AL-TA3-T`
- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`
- 3D model: TO-220 (KiCad packages3D, STEP)
- 3D model files: `lm317al-ta3-t-etched.step` / `lm317al-ta3-t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm317al-ta3-t.step` / `lm317al-ta3-t.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [UTC(Unisonic Tech) datasheet](docs/lm317al-ta3-t-datasheet.pdf) (5 pp, sha256 `03e0560656b59da8`, retrieved 2026-10-22, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/lm317al-ta3-t-datasheet.pdf)