# LM2951D-3.3

**HTC Korea TAEJIN Tech** · Linear Voltage Regulators (LDO) · SOP-8

LM2951D-3.3 from HTC Korea TAEJIN Tech, in a SOP-8. 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 | Output | power_out | Regulated output voltage pin of the LM2951-3.3 regulator, rated for up to 100 mA output current and needing only 1uF for stability. |
| 2 | Sense | input | Sense input that is tied to the output to set the fixed output voltage (VOUT=XX V) in the 8-pin versions. |
| 3 | Shutdown | input | Logic-compatible electronic shutdown input, where low (<=0.8V) turns the regulator ON and high (>=2V, max 30V) turns it OFF. |
| 4 | Ground | power_in | Ground pin of the regulator. |
| 5 | Error | output | Error flag comparator output that goes low to warn of output dropout (low output voltage), usable as a power-on reset, with a maximum voltage of -0.3 to +30V. |
| 6 | Tap | passive | Internal divider tap that is tied to the Feedback pin to set the fixed output voltage (-XX V tap) in the 8-pin versions. |
| 7 | Feedback | input | Feedback input to the error amplifier, tied to the Tap pin for fixed output voltage or to an external resistor pair to program 1.24 to 29V, with an absolute maximum of -0.3 to +30V. |
| 8 | Input | power_in | Unregulated DC supply input, with an absolute maximum input supply voltage of -0.3 to +30V (the datasheet lists -0.3 to +30V/-1.5 to +30V ratings). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HTC Korea TAEJIN Tech |
| Package | SOP-8 |
| Category | Power Management ICs |
| Pins | 8 |

## 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 | 1.21 | 1.235 | 1.26 | V | 8-pin versions only | 4 |
| Reference Voltage Over Temperature | VREF | 1.185 |  | 1.285 | V | Note 7 | 4 |
| Feedback Pin Bias Current |  |  | 20 | 40 | nA | 8-pin versions only | 4 |
| Reference Voltage Temperature Coefficient |  |  | 20 | 50 | ppm/℃ | Note 8 | 4 |
| Feedback Pin Bias Current Temperature Coefficient |  |  | 0.1 |  | nA/℃ |  | 4 |
| Input Supply Voltage | VIN | -0.3 |  | 30 | V |  | 2 |
| Feedback Input Voltage |  | -1.5 |  | 30 | V |  | 2 |
| Shutdown Input Voltage |  | -0.3 |  | 30 | V |  | 2 |
| Error Comparator Output Voltage |  | -0.3 |  | 30 | V |  | 2 |
| Operating Junction Temperature Range | TJ | -55 |  | 150 | ℃ |  | 2 |
| Storage Temperature Range | Tstg | -65 |  | 150 | ℃ |  | 2 |
| Lead Temperature |  |  |  | 260 | ℃ | Soldering, 5 seconds | 2 |

## CAD (KiCad official)

- Symbol: `LM2951D-3.3`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `lm2951d-3-3-etched.step` / `lm2951d-3-3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2951d-3-3.step` / `lm2951d-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/lm2951d-3-3-datasheet.pdf) (4 pp, sha256 `9ad6b6821316b8ff`, retrieved 2026-10-26, 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/lm2951d-3-3-datasheet.pdf)