# LM2940T-3.3

**HTC Korea TAEJIN Tech** · Linear Voltage Regulators (LDO) · TO-220

LM2940T-3.3 from HTC Korea TAEJIN 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 | VIN | power_in | Input voltage pin; recommended maximum 26V (survival rating -20V to 30V), with CIN of at least 1uF required for stability. |
| 2 | GND | power_in | Ground pin. |
| 3 | VOUT | power_out | Regulated 3.3V output delivering up to 1A, with COUT of at least 10uF required for stability. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HTC Korea TAEJIN Tech |
| Package | TO-220 |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Output Voltage Tolerance | VO | -1 |  | 1 | % | IOUT = 5mA | 5 |
| Output Voltage Tolerance | VO | -2 |  | 2 | % | 5 mA ≤ IOUT ≤ 1A, (VOUT+1V) ≤ VIN ≤ 26V | 5 |
| Line Regulation | ΔVLINE |  | 0.06 | 0.5 | % | IOUT = 5mA, (VOUT+1V) ≤ VIN ≤ 26V | 5 |
| Load Regulation | ΔVLOAD |  | 0.2 | 1 | % | VIN = VOUT +1V, 5 mA ≤ IOUT ≤ 1A | 5 |
| Output Voltage Temperature Coefficient | ΔVOUT/ΔT |  |  | 100 | ppm/°C |  | 5 |
| Dropout Voltage | VDROP |  | 60 | 180 | mV | IOUT = 5mA | 5 |
| Dropout Voltage | VDROP |  | 400 | 630 | mV | IOUT = 1A | 5 |
| Ground Pin Current | IGND |  | 250 | 500 | μA | IOUT = 5mA | 5 |
| Ground Pin Current | IGND |  | 16 | 25 | mA | IOUT = 1A | 5 |
| Input Supply Voltage (Survival) | VIN | -20 |  | 30 | V |  | 1 |
| Maximum Output Current | IOUT_MAX |  |  | 1 | A |  | 1 |
| Lead Temperature | TSOL |  |  | 260 | °C |  | 1 |
| Storage Temperature Range | TSTG | -65 |  | 150 | °C |  | 1 |
| Operating Junction Temperature Range (absolute max table) | TOPR | -40 |  | 125 | °C |  | 1 |
| Input Supply Voltage | VIN |  |  | 26 | V |  | 1 |
| Operating Junction Temperature Range | TOPR | -40 |  | 85 | °C |  | 1 |
| Thermal Resistance Junction-To-Ambient TO-220-3L | θJA-TO-220-3L |  |  | 70 | °C/W | No heat sink / No air flow / No adjacent heat source / TA=25°C | 6 |
| Dropout Voltage | VDROP |  | 170 |  | mV | IOUT = 100mA | 5 |
| Ground Pin Current at Dropout | IGNDDO |  | 1 |  | mA | VIN = 0.5V less than specified VOUT, IOUT = 5mA | 5 |
| Current Limit | ICL |  | 1.5 |  | A | VOUT = 0V | 5 |

## CAD (KiCad official)

- Symbol: `LM2940T-3.3`
- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`
- 3D model: TO-220 (KiCad packages3D, STEP)
- 3D model files: `lm2940t-3-3-etched.step` / `lm2940t-3-3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2940t-3-3.step` / `lm2940t-3-3.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HTC Korea TAEJIN Tech datasheet](docs/lm2940t-3-3-datasheet.pdf) (7 pp, sha256 `69be479de06a1346`, retrieved 2026-10-24, tier: lcsc)
- **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/lm2940t-3-3-datasheet.pdf)