# NCV4254CDSTR2G

**onsemi** · Pre-ordered transistors · SOIC-8

NCV4254CDSTR2G 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 | Vout | power_out | Tracker output voltage; connect a 2.2 µF capacitor with ESR < 5 to ground, and it may be connected directly or via a voltage divider for lower output voltages. |
| 2 | GND | power_in | Power supply ground. |
| 3 | GND | power_in | Power supply ground. |
| 4 | ST | output | Tracking regulator status open-collector output, connected via a pull-up resistor to a positive voltage rail, which goes low to indicate a fault at the regulator output. |
| 5 | EN/REF | input | Enable/reference input: a low signal disables the IC and a high signal switches it on, and the reference voltage may be connected directly or via a voltage divider for lower output voltages. |
| 6 | GND | power_in | Power supply ground. |
| 7 | GND | power_in | Power supply ground. |
| 8 | Vin | power_in | Positive power supply input; connect a 0.1 µF capacitor to ground. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOIC-8 |
| Category | Transistors |
| 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 |
|---|---|---|---|---|---|---|---|
| Input Voltage DC | Vin | -20 |  | 45 | V | DC (Note 1) | 3 |
| Peak Transient Voltage (Load Dump) | Vin |  |  | 45 | V | Load Dump (Note 2) | 3 |
| Output Voltage | Vout | -5 |  | 40 | V |  | 3 |
| Enable / Reference Input Voltage DC | VEN/REF | -20 |  | 40 | V | DC | 3 |
| Status output Voltage (Status Output Version) DC | VST | -0.3 |  | 7 | V | DC | 3 |
| Maximum Junction Temperature | TJ(max) | -40 |  | 150 | °C |  | 3 |
| Storage Temperature | TSTG | -55 |  | 150 | °C |  | 3 |
| ESD Capability, Human Body Model | ESDHBM | -4 |  | 4 | kV |  | 3 |
| Input Voltage | Vin | 4 |  | 45 | V |  | 4 |
| Enable / Reference Input Voltage | VEN/REF | 2 |  |  | V |  | 4 |
| Junction Temperature | TJ | -40 |  | 150 | °C |  | 4 |
| Output Voltage Tracking Accuracy | Vout | -3 |  | 3 | mV | Vin = 5.7 V to 26 V, Iout = 0.1 mA to 60 mA, 2.5 V ≤ VEN/REF ≤ (VIN − 600 mV) | 4 |
| Output Voltage Tracking Accuracy | Vout | -10 |  | 10 | mV | Vin = 5.5 V to 26 V, Iout = 0.1 mA to 60 mA, VEN/REF = 5 V | 4 |
| Line Regulation | Regline | -5 |  | 5 | mV | Vin = 5.5 V to 32 V, Iout = 5 mA, VEN/REF = 5V | 4 |
| Load Regulation | Regload | -5 |  | 5 | mV | Iout = 0.1 mA to 70 mA, VEN/REF = 5 V | 4 |
| Dropout Voltage | VDO |  | 220 | 400 | mV | Iout = 70 mA, VEN/REF = 5 V | 4 |
| Disable Current, Stand-by Mode | IDIS |  | 0.01 | 5 | A | VEN/REF ≤ 0.4 V, TJ ≤ 125°C | 4 |
| Quiescent Current | Iq |  | 65 | 80 | A | Iout ≤ 0.1 mA, VEN/REF = 5 V | 4 |
| Quiescent Current | Iq |  | 1 | 2 | mA | Iout ≤ 70 mA, VEN/REF = 5 V | 4 |
| Current Limit | ILIM | 71 | 110 | 150 | mA | Vout = (VEN/REF, 0.1 V), VEN/REF = 5 V | 4 |
| Reverse Current | Iout_rev | -15 | -10 |  | mA | Vin = 0 V, Vout = 32 V, VEN/REF = 5 V | 4 |
| Reverse Current at Negative Input Voltage | Iin_rev | -1 | -0.2 |  | mA | Vin = −16 V, Vout = 0 V, VEN/REF = 5 V | 4 |
| Enable / Reference Input Threshold Voltage, Logic Low | Vth(EN/REF) |  |  | 0.4 | V | Vout = 0 V, Iout ≤ 5 A, Tj ≤ 125°C | 4 |
| Enable / Reference Input Threshold Voltage, Logic High | Vth(EN/REF) | 2 |  |  | V | /Vout − VEN/REF/ < 10 mV | 4 |
| Enable / Reference Input Current | IEN/REF |  | 2 | 3 | A | VEN/REF = 5 V | 5 |
| Enable / Reference Input Current if Input tied to GND | IEN/REF |  | 0.003 | 0.6 | mA | Vin = 0 V, VEN/REF = 5 V | 5 |
| Enable / Reference Internal Pull-Down Resistor | REN/REF | 1.7 | 2.2 | 3.3 | M |  | 5 |
| Status Switching Threshold, Undervoltage | Vout_UV | -120 | -77 | -50 | mV | Vout decreasing | 5 |
| Status Switching Threshold, Overvoltage | Vout_OV | 50 | 77 | 120 | mV | Vout increasing | 5 |
| Status reaction Time | tST | 10 | 23 | 33 | s |  | 5 |
| Status Output Low Voltage | VST_low |  |  | 0.4 | V | IST = 1 mA, Vin ≥ 4 V | 5 |
| Status Output Sink Current Limitation | IST_max | 1 |  |  | mA | VST = 0.8 V | 5 |
| Status Output Leakage Current | IST_leak |  |  | 2 | A | Vout = VEN/REF, VST = 5 V | 5 |
| Thermal Shutdown Temperature | TSD | 151 | 175 | 200 | °C | Note 8 | 5 |
| Thermal Resistance, Junction-to-Ambient (SOIC-8) | RJA |  | 115 |  | °C/W | Note 5: 645 mm2 (1 in2) 1 oz copper, FR4 PCB | 4 |
| Thermal Reference, Junction-to-Case Top (SOIC-8) | RJT |  | 11.5 |  | °C/W | Note 5 | 4 |

## CAD (KiCad official)

- Symbol: `NCV4254CDSTR2G`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `ncv4254cdstr2g-etched.step` / `ncv4254cdstr2g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ncv4254cdstr2g.step` / `ncv4254cdstr2g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/ncv4254cdstr2-d.pdf) (17 pp, sha256 `6d682e1e389ebefd`, retrieved 2026-10-27, tier: manufacturer)
- **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/ncv4254cdstr2g-datasheet.pdf)