# NCP1200P40G

**onsemi** · AC-DC Controllers & Regulators · PDIP-8

NCP1200P40G from onsemi, in a PDIP-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 | Adj | passive | Adjusts the skip-cycle level, with a default skip mode level of 1.4 V (1.1 V to 1.6 V) and an internal output impedance of about 25 kΩ on this pin. |
| 2 | FB | input | Feedback input from the optocoupler that sets the peak current setpoint, with an internal pull-up resistor of 8.0 kΩ typical. |
| 3 | CS | input | Current sense input that routes the primary current through the leading edge blanking to the internal comparator, with a maximum internal current setpoint of 0.8 V to 1.0 V and a propagation delay of 160 ns maximum. |
| 4 | GND | power_in | IC ground reference. |
| 5 | Drv | output | Driver output to the external MOSFET gate, with source resistance of 40 Ω typical and sink resistance of 12 Ω typical. |
| 6 | VCC | power_in | Supplies the IC and connects to an external bulk capacitor of typically 10 µF, with a maximum rating of 16 V. |
| 7 | NC | unconnected | No internal connection; this pin is left unconnected to ensure adequate creepage distance. |
| 8 | HV | power_in | Connected to the high-voltage rail, this pin injects a constant current into the VCC bulk capacitor, with a maximum voltage of 450 V (VCC grounded) or 500 V (VCC decoupled with 10 µF) and a minimum operating voltage of 30 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | PDIP-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 |
|---|---|---|---|---|---|---|---|
| VCC increasing level at which the current source turns off | VCCOFF | 10.3 | 11.4 | 12.5 | V |  | 4 |
| VCC decreasing level at which the current source turns on | VCCON | 8.8 | 9.8 | 11 | V |  | 4 |
| Internal IC consumption, no output load on pin 5 | ICC1 |  | 710 | 880 | µA | No output load on pin 5; max value at TJ = -25°C | 4 |
| Internal IC consumption, 1 nF output load on pin 5, FSW = 40 kHz | ICC2 |  | 1.2 | 1.4 | mA | 1 nF output load on pin 5, FSW = 40 kHz; max value at TJ = 25°C | 4 |
| High-voltage current source, VCC = 10 V | IC1 | 2.8 | 4 |  | mA | VCC = 10 V | 4 |
| Source resistance (drive = 0, Vgate = VCCHMAX - 1 V) | ROH | 27 | 40 | 61 |  | drive = 0, Vgate = VCCHMAX − 1 V | 4 |
| Sink resistance (drive = 11 V, Vgate = 1 V) | ROL | 5 | 12 | 25 |  | drive = 11 V, Vgate = 1 V | 4 |
| Maximum internal current setpoint | ILimit | 0.8 | 0.9 | 1 | V |  | 4 |
| Propagation delay from current detection to gate OFF state | TDEL |  | 100 | 160 | ns |  | 4 |
| Oscillation frequency, 40 kHz version | fOSC | 36 | 42 | 48 | kHz | VCC = 11 V, pin 5 loaded by 1 k | 4 |
| Maximum duty cycle | Dmax | 74 | 80 | 87 | % |  | 4 |
| Default skip mode level | Vskip | 1.1 | 1.4 | 1.6 | V |  | 4 |
| Maximum voltage on pin 8 (HV), pin 6 (VCC) grounded |  |  |  | 450 | V | Pin 6 (VCC) grounded | 3 |
| Maximum voltage on pin 8 (HV), pin 6 (VCC) decoupled to ground with 10 µF |  |  |  | 500 | V | Pin 6 (VCC) decoupled to ground with 10 µF | 3 |
| Power supply voltage | VCC |  |  | 16 | V |  | 3 |
| Minimum operating voltage on pin 8 (HV) |  | 30 |  |  | V |  | 3 |
| Maximum junction temperature | TJmax |  |  | 150 | °C |  | 3 |
| Storage temperature range | Tstg | -60 |  | 150 | °C |  | 3 |
| ESD capability, HBM model (all pins except VCC and HV) |  | 2 |  |  | kV | All pins except VCC and HV, Human Body Model per JESD22 A114E | 3 |
| ESD capability, machine model |  | 200 |  |  | V | Machine Model per JESD22 A115A | 3 |
| Thermal resistance junction-to-air, PDIP-8 version | RJA |  |  | 100 | °C/W | PDIP-8 version | 3 |
| Thermal resistance junction-to-case | RJC |  |  | 57 | °C/W |  | 3 |

## CAD (KiCad official)

- Symbol: `NCP1200P40G`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: PDIP-8 (KiCad packages3D, STEP)
- 3D model files: `ncp1200p40g-etched.step` / `ncp1200p40g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ncp1200p40g.step` / `ncp1200p40g.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/ncp1200p40-d.pdf) (16 pp, sha256 `c741c25b9e87eca9`, retrieved 2026-10-30, 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/ncp1200p40g-datasheet.pdf)