# NCP1247BD065R2G

**onsemi** · AC-DC Controllers & Regulators · SOIC-7

NCP1247BD065R2G from onsemi, in a SOIC-7. 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 | LATCH | input | Latch-off input: pull the pin up or down to latch off the controller; an internal current source allows direct connection of an NTC for over temperature detection. |
| 2 | FB | input | Feedback and shutdown pin: an optocoupler collector to ground controls output regulation, and the part goes to the low consumption Off mode if the pin is pulled to GND. |
| 3 | CS | input | Current sense input that senses the primary current for current-mode operation and offers an overpower compensation adjustment. |
| 4 | GND | power_in | The controller ground. |
| 5 | DRV | output | Drive output that drives the external MOSFET (500/800 mA source/sink peak current capability). |
| 6 | VCC | power_in | Supply input accepting up to 28 Vdc with overvoltage detection, connected to an external auxiliary voltage; no other circuit may be connected to this pin. |
| 8 | HV | input | High-voltage pin connecting to the rectified AC line for start-up current source, self-supply, brown-out detection, X2 capacitor discharge and HV sensing for overpower protection; must not be connected to DC voltage. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOIC-7 |
| Category | Power Management ICs |
| Pins | 7 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| DRV pin voltage |  | -0.3 |  | 20 | V | pin 5; ±1000 mA peak | 4 |
| VCC supply voltage |  | -0.3 |  | 28 | V | pin 6, continuous; ±30 mA peak | 4 |
| HV pin voltage |  | -0.3 |  | 500 | V | pin 8; ±20 mA | 4 |
| Voltage on low power pins | Vmax | -0.3 |  | 10 | V | except pin 5, 6, 8; ±10 mA peak | 4 |
| Operating junction temperature | TJMAX | -40 |  | 150 | °C |  | 4 |
| Storage temperature | TSTRGMAX | -60 |  | 150 | °C |  | 4 |
| Thermal resistance junction-to-air, low conductivity PCB | RJ-A |  | 162 |  | °C/W | SOIC-7, 50 mm2 copper | 4 |
| Thermal resistance junction-to-air, medium conductivity PCB | RJ-A |  | 147 |  | °C/W | SOIC-7, 100 mm2 copper | 4 |
| Thermal resistance junction-to-air, high conductivity PCB | RJ-A |  | 115 |  | °C/W | SOIC-7, 650 mm2 copper | 4 |
| Thermal resistance junction-to-case | RJ-C |  | 73 |  | °C/W |  | 4 |
| Minimum voltage for current source operation | VHV(min) |  | 30 | 40 | V |  | 5 |
| HV current source current | Istart1 | 0.2 | 0.5 | 0.8 | mA | VCC = 0 V | 5 |
| HV current source current (X2 discharge) | Istart2 | 5 | 8 | 11 | mA | VCC = VCC(on) − 0.5 V | 5 |
| Off-state leakage current | Istart(off) | 10 | 25 | 50 | µA | VHV = 500 V, VCC = 15 V | 5 |
| Off-mode HV supply current | IHV(off) |  | 45 | 60 | µA | VHV = 141 V, VCC loaded by 4.7 µF cap | 5 |
| Off-mode HV supply current | IHV(off) |  | 50 | 70 | µA | VHV = 325 V, VCC loaded by 4.7 µF cap | 5 |
| HV current source regulation threshold | VCC(reg) | 8 | 11 |  | V |  | 5 |
| Turn-on threshold, VCC going up | VCC(on) | 11 | 12 | 13 | V |  | 5 |
| HV current source restart threshold | VCC(min) | 9.5 | 10.5 | 11.5 | V |  | 5 |
| Turn-off threshold | VCC(off) | 8.5 | 8.9 | 9.3 | V |  | 5 |
| Overvoltage threshold | VCC(ovp) | 25 | 26.5 | 28 | V |  | 5 |
| Internal current consumption | ICC1 | 1.3 | 1.85 | 2.2 | mA | DRV open, VFB = 3 V, 65 kHz | 5 |
| Internal current consumption | ICC2 | 1.8 | 2.6 | 3 | mA | Cdrv = 1 nF, VFB = 3 V, 65 kHz | 5 |
| Internal current consumption, off mode | ICC3 | 0.67 | 0.9 | 1.13 | mA | Off mode (skip or before start-up) | 5 |
| Internal current consumption, fault mode | ICC4 | 0.3 | 0.6 | 0.9 | mA | Fault mode (fault or latch) | 5 |
| Brown-out start threshold (A/B versions) | VHV(start) | 102 | 111 | 120 | V | VHV going up | 5 |
| Brown-out stop threshold (A/B versions) | VHV(stop) | 94 | 103 | 112 | V | VHV going down | 5 |
| Timer duration for line cycle drop-out | tHV | 52 | 73 | 94 | ms |  | 5 |
| Comparator hysteresis at HV pin | VHV(hyst) | 1.5 | 3.5 | 5 | V |  | 5 |
| Oscillator frequency | fOSC | 58 | 65 | 72 | kHz | 65 kHz option | 5 |
| Maximum on time | tONmax(65kHz) | 11.3 | 12.3 | 13.1 | µs | fOSC = 65 kHz | 6 |
| Frequency jittering amplitude | Ajitter | 4 | 6 | 8 | % | percentage of FOSC | 6 |
| Frequency jittering modulation frequency | Fjitter | 85 | 125 | 165 | Hz |  | 6 |
| Foldback start threshold | VFB(foldS) | 1.8 | 2 | 2.2 | V |  | 6 |
| Foldback complete threshold | VFB(foldE) | 0.8 | 0.9 | 1 | V |  | 6 |
| Minimum switching frequency | fOSC(min) | 23 | 27 | 32 | kHz | VFB = Vskip(in) + 0.1 | 6 |
| Output rise time | trise |  | 40 | 70 | ns | VCC = VCC(min) + 0.2 V, CDRV = 1 nF | 6 |
| Clamping voltage | VDRV(clamp) | 11 | 13.5 | 16 | V | VCC = VCCmax, 0.2 V, DRV high, RDRV = 33 kΩ, Cload = 220 pF | 6 |
| Maximum internal current setpoint | VILIM | 0.66 | 0.7 | 0.74 | V | VFB > 3.5 V | 6 |
| Propagation delay to DRV off | tdelay |  | 80 | 110 | ns | VCS = VILIM | 6 |
| Leading edge blanking duration for VILIM | tLEB | 200 | 250 | 320 | ns |  | 6 |
| Immediate fault protection threshold | VCS(stop) | 0.95 | 1.05 | 1.15 | V |  | 6 |
| Soft-start duration | tSSTART | 8 | 11 | 14 | ms | From 1st pulse to VCS = VILIM | 6 |
| Internal pull-up resistor | RFB(up) | 15 | 20 | 25 | kΩ | TJ = 25°C | 6 |
| VFB to current setpoint division ratio | KFB | 4.7 | 5 | 5.3 |  |  | 7 |
| Skip mode threshold, going down | Vskip(in) | 0.63 | 0.7 | 0.77 | V | VFB going down | 7 |
| Skip mode threshold, going up | Vskip(out) | 0.72 | 0.8 | 0.88 | V | VFB going up | 7 |
| Off mode entry voltage | VOFF | 0.35 | 0.4 | 0.45 | V | VCC > VCC(off) | 7 |
| Go To Off mode timer | tGTOM | 100 | 150 | 300 | ms | VCC > VCC(off) | 7 |
| Fault timer duration | tfault | 108 | 128 | 178 | ms |  | 7 |
| Autorecovery mode latch-off time | tautorec | 0.85 | 1 | 1.35 | s |  | 7 |
| Current flowing out of CS pin | IOPC(365) | 105 | 130 | 150 | µA | VHV = 365 V | 7 |
| Latch high threshold | VOVP | 2.35 | 2.5 | 2.65 | V | VLatch going up | 7 |
| Latch low threshold | VOTP | 0.76 | 0.8 | 0.84 | V | VLatch going down | 7 |
| NTC current source, normal operation | INTC | 65 | 95 | 105 | µA | VLatch = 0 V | 7 |
| Blanking duration on high latch detection | tLatch(OVP) | 35 | 50 | 70 | µs | 65 kHz version | 7 |
| Latch clamping voltage | Vclamp0(Latch) | 1 | 1.2 | 1.4 | V | ILatch = 0 mA | 7 |

## CAD (KiCad official)

- Symbol: `NCP1247BD065R2G`
- Footprint: `Package_SO:SOIC-8-N7_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-7 (KiCad packages3D, STEP)
- 3D model files: `ncp1247bd065r2g-etched.step` / `ncp1247bd065r2g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ncp1247bd065r2g.step` / `ncp1247bd065r2g.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/ncp1247bd065r2-d.pdf) (44 pp, sha256 `a23ff3d833918105`, retrieved 2026-10-23, tier: manufacturer)
- **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/ncp1247bd065r2g-datasheet.pdf)