# NCP349MNAETBG

**onsemi** · Monitors & Reset Circuits · DFN-6-EP(1.6x2)

NCP349MNAETBG from onsemi, in a DFN-6-EP(1.6x2). 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 | IN | power_in | Input voltage pin that must be bypassed to GND with a 1.0 µF low-ESR ceramic capacitor or larger placed as close as possible to the device, and it must be connected together with pin 7; the IN to GND maximum rating is 30 V. |
| 2 | GND | power_in | Ground reference pin for the device. |
| 3 | FLAG | output | Open-drain fault indication output that goes low when the input exceeds the OVLO threshold or drops below the UVLO threshold, and requires an external pull-up resistor to VCC of at least 10 kΩ. |
| 4 | OUT | power_out | Output voltage pin that follows the IN pins when no fault is detected and must be hardwired together with pin 5. |
| 5 | OUT | power_out | Output voltage pin that follows the IN pins when no fault is detected and must be hardwired together with pin 4. |
| 6 | EN | input | Enable pin where a high level puts the device in shutdown and disconnects OUT from IN, while it must be tied low or to GND for normal operation; the EN voltage high threshold is 1.2 V and the low threshold is 0.4 V maximum. |
| 7 | IN | power_in | Input voltage pin, listed with pin 1 as IN, that must be connected together with pin 1 to the supply; per the PCB recommendations it is the exposed pad internally connected to the NMOS drain and must be connected to pin 1 and not to any other potential. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | DFN-6-EP(1.6x2) |
| 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 |
|---|---|---|---|---|---|---|---|
| Undervoltage Lockout Threshold | UVLO | 2.8 | 2.95 | 3.1 | V | Vin falls below UVLO threshold from 5 V to 2.7 V | 4 |
| Overvoltage Lockout Threshold | OVLO | 5.53 | 5.68 | 5.83 | V | Vin rises above OVLO threshold | 4 |
| Vin versus Vout Resistance | RDS(on) |  | 65 | 110 | m | Vin = 5.0 V, EN = GND, Load connected to Vout | 4 |
| Supply Quiescent Current | Idd |  | 70 | 150 | µA | No load. EN = 5.0 V | 4 |
| Supply Quiescent Current | Idd |  | 140 | 250 | µA | No load. EN = Gnd | 4 |
| FLAG Output Low Voltage | Volflag |  | 20 | 400 | mV | 1.2 V < VIN < UVLO; Sink 50 µA on FLAG pin | 4 |
| FLAG Output Low Voltage | Volflag |  |  | 400 | mV | VIN > OVLO; Sink 1.0 mA on FLAG pin | 4 |
| Input Voltage Range | Vin | 1.2 |  | 28 | V |  | 4 |
| EN Voltage High | Vih | 1.2 |  |  | V |  | 4 |
| EN Voltage Low | Vol |  |  | 0.4 | V |  | 4 |
| Startup Delay | ton | 6 | 10 | 14 | ms | From Vin > UVLO to Vout = 0.3 V (See Figures 3 & 7) | 4 |
| FLAG Going Up Delay | tstart | 6 | 10 | 14 | ms | From Vout = 0.3 V to FLAG = 1.2 V (See Figures 3 & 9) | 4 |
| Output Turn Off Time | toff |  | 1.5 | 5 | s | From Vin > OVLO to Vout <= 0.3 V; Vin increasing from 5.0 V to 8.0 V at 3.0 V/s; Rload connected on Vout | 4 |
| Disable Time | tdis |  | 1 | 5 | s | From EN >= 1.2 V to Vout < 0.3 V; Rload = 5.0 | 4 |
| Minimum Voltage (IN to GND) | Vminin | -0.3 |  |  | V |  | 3 |
| Minimum Voltage (All others to GND) | Vmin | -0.3 |  |  | V |  | 3 |
| Maximum Voltage (IN to GND) | Vmaxin |  |  | 30 | V |  | 3 |
| Maximum Voltage (All others to GND) | Vmax |  |  | 7 | V |  | 3 |
| Maximum Current | Imax |  |  | 2 | A | UVLO<VIN<OVLO | 3 |
| Maximum Peak Current | Imaxpeak |  |  | 4 | A | t <= 1 ms, TA = 85°C | 3 |
| Thermal Resistance, Junction-to-Air | RJA |  | 180 |  | °C/W | Note 1 | 3 |
| Operating Ambient Temperature Range | TA | -40 |  | 85 | °C |  | 3 |
| Storage Temperature Range | Tstg | -65 |  | 150 | °C |  | 3 |
| Junction Operating Temperature | TJ |  |  | 150 | °C |  | 3 |
| ESD Withstand Voltage (IEC 61000-4-2) Air | Vesd |  |  | 15 | kV | Air, input only, when bypassed with 1.0 µF capacitor | 3 |
| ESD Withstand Voltage (IEC 61000-4-2) Contact | Vesd |  |  | 8 | kV | Contact, input only, when bypassed with 1.0 µF capacitor | 3 |
| ESD Withstand Voltage Human Body Model | Vesd |  |  | 2000 | V | HBM, Model = 2 (Note 2) | 3 |
| ESD Withstand Voltage Machine Model | Vesd |  |  | 200 | V | MM, Model = B (Note 3) | 3 |

## CAD (KiCad official)

- Symbol: `NCP349MNAETBG`
- Footprint: `Package_DFN_QFN:DFN-6-1EP_2x1.6mm_P0.5mm_EP1.15x1.3mm`
- 3D model: DFN-6-EP(1.6x2) (KiCad packages3D, STEP)
- 3D model files: `ncp349mnaetbg-etched.step` / `ncp349mnaetbg-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ncp349mnaetbg.step` / `ncp349mnaetbg.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/ncp349mnaetb-d.pdf) (12 pp, sha256 `7274967bd9a43a93`, retrieved 2026-10-28, 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/ncp349mnaetbg-datasheet.pdf)