# NCV2951ACD3.3R2G

**onsemi** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOIC-8

NCV2951ACD3.3R2G from onsemi, in a SOIC-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 of the regulator, rated 100 mA with a 5.0 V, 3.3 V or 3.0 V preset (±0.5% on the 'A' suffix version) and requiring a 1.0 µF output capacitor for stability. |
| 2 | Sense | input | Sense input connected to the output side, used for the output voltage sensing of the regulator. |
| 3 | Shutdown | input | Logic-level shutdown input that turns the regulator output off or on. |
| 4 | GND | power_in | Ground reference pin for the regulator. |
| 5 | Error Output | output | Error output that signals an out-of-regulation condition to external circuitry, or can serve as a microprocessor power-on reset. |
| 6 | VO Tap | passive | Output voltage tap of the pinned internal resistor divider used to program the output voltage. |
| 7 | Feedback | input | Direct access to the error amplifier feedback input, used to program the output from 1.25 V to 29 V. |
| 8 | Input | power_in | Unregulated input supply; the datasheet specifies a 50 mV input-to-output differential at 100 µA and 380 mV at 100 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| 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 |
|---|---|---|---|---|---|---|---|
| Output Voltage, 3.3 V version (TA = 25°C) | VO | 3.284 | 3.3 | 3.317 | V | Vin = 4.3 V, IO = 100 µA, TA = 25°C | 4 |
| Output Voltage, 3.3 V version (TA = −40 to +125°C) | VO | 3.26 |  | 3.34 | V | Vin = 4.3 V, IO = 100 µA, TA = −40 to +125°C | 4 |
| Output Voltage, 3.3 V version (line/load/temperature) | VO | 3.254 |  | 3.346 | V | Vin = 4.3 to 30 V, IO = 100 µA to 100 mA, TA = −40 to +125°C | 4 |
| Line Regulation | Regline |  | 0.04 | 0.1 | % | Vin = VO(nom) +1.0 V to 30 V | 5 |
| Load Regulation | Regload |  | 0.05 | 0.1 | % | IO = 100 µA to 100 mA | 5 |
| Dropout Voltage | VI − VO |  | 30 | 80 | mV | IO = 100 µA | 5 |
| Dropout Voltage | VI − VO |  | 350 | 450 | mV | IO = 100 mA | 5 |
| Supply Bias Current | ICC |  | 93 | 120 | µA | IO = 100 µA | 5 |
| Supply Bias Current | ICC |  | 4 | 12 | mA | IO = 100 mA | 5 |
| Dropout Supply Bias Current | ICCdropout |  | 110 | 170 | µA | Vin = VO(nom) − 0.5 V, IO = 100 µA | 5 |
| Current Limit | ILimit |  | 220 | 300 | mA | VO shorted to ground | 5 |
| Reference Voltage (TA = 25°C) | Vref | 1.22 | 1.235 | 1.25 | V | TA = 25°C | 5 |
| Reference Voltage (TA = −40 to +125°C) | Vref | 1.2 |  | 1.26 | V | TA = −40 to +125°C | 5 |
| Reference Voltage | Vref | 1.19 |  | 1.27 | V | IO = 100 µA to 100 mA, Vin = 23 to 30 V | 5 |
| Feedback Pin Bias Current | IFB |  | 15 | 40 | nA |  | 5 |
| Output Leakage Current (error comparator) | Ilkg |  | 0.01 | 1 | µA | VOH = 30 V | 5 |
| Output Low Voltage (error comparator) | VOL |  | 150 | 250 | mV | Vin = 4.5 V, IOL = 400 µA | 5 |
| Upper Threshold Voltage | Vthu | 40 | 45 |  | mV | Vin = 6.0 V | 5 |
| Lower Threshold Voltage | Vthl |  | 60 | 95 | mV | Vin = 6.0 V | 5 |
| Input Logic Voltage, Logic “0” (Regulator On) | Vshtdn | 0 |  | 0.7 | V | Regulator on | 5 |
| Input Logic Voltage, Logic “1” (Regulator Off) | Vshtdn | 2 |  | 30 | V | Regulator off | 5 |
| Shutdown Pin Input Current | Ishtdn |  | 35 | 50 | µA | Vshtdn = 2.4 V | 5 |
| Shutdown Pin Input Current | Ishtdn |  | 450 | 600 | µA | Vshtdn = 30 V | 5 |
| Regulator Output Current in Shutdown Mode | Ioff |  | 3 | 10 | µA | Vin = 30 V, Vshtdn = 2.0 V, VO = 0, Pin 6 connected to Pin 7 | 5 |
| Input Voltage | VCC |  |  | 30 | Vdc |  | 3 |
| Peak Transient Input Voltage | VCC |  |  | 32 | Vdc | t < 300 ms | 3 |
| Feedback Input Voltage | Vfb | -1.5 |  | 30 | Vdc |  | 3 |
| Shutdown Input Voltage | Vsd | -0.3 |  | 30 | Vdc |  | 3 |
| Error Comparator Output Voltage | Verr | -0.3 |  | 30 | Vdc |  | 3 |
| Operating Ambient Temperature Range | TA | -40 |  | 125 | °C |  | 3 |
| Maximum Die Junction Temperature Range | TJ |  |  | 150 | °C |  | 3 |
| Storage Temperature Range | Tstg | -65 |  | 150 | °C |  | 3 |
| Thermal Resistance, Junction-to-Ambient (SOIC-8, D suffix, Case 751) | RJA |  | 180 |  | °C/W | Case 751 (SOIC-8) D suffix | 3 |
| Thermal Resistance, Junction-to-Case (SOIC-8, D suffix, Case 751) | RJC |  | 45 |  | °C/W | Case 751 (SOIC-8) D suffix | 3 |

## CAD (KiCad official)

- Symbol: `NCV2951ACD3.3R2G`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `ncv2951acd3-3r2g-etched.step` / `ncv2951acd3-3r2g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ncv2951acd3-3r2g.step` / `ncv2951acd3-3r2g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589996860577378304) (25 pp, sha256 `866e459f55a12386`, 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/ncv2951acd3-3r2g-datasheet.pdf)