onsemi NCP347MTAFTBG

Overview

NCP347MTAFTBG from onsemi is a positive overvoltage protection controller with integrated 65 mΩ NMOS FET, 5.90 V typical OVLO threshold, 2.95 V UVLO threshold, and open-drain FLAG output-designed to safeguard battery-powered portable electronics such as camera phones and digital still cameras against input overvoltage up to +28 V.

For engineers reviewing the NCP347MTAFTBG datasheet, pinout, applications, or equivalent options, this device delivers fast fault response (≤1.0 µs alert delay), internal charge pump for gate drive, 50 ms startup delay, ESD-protected IN pin (15 kV air), and WDFN-10 2.5×2 mm Pb-free package-key selection criteria for compact, high-reliability power path protection.

Technical Context

The NCP347MTAFTBG implements a state-machine–driven protection architecture with independent UVLO (2.95 V typ) and OVLO (5.90 V typ) comparators, hysteresis (60 mV UVLOhyst, 90 mV OVLOhyst), and internal charge pump enabling full enhancement of the integrated NMOS FET without external bias. It operates across −40 °C to +85 °C ambient with 2 A max continuous output current capability.

Its FLAG output is open-drain, requiring an external pull-up resistor, and remains active-low during fault conditions (VIN < UVLO or VIN > OVLO), even when EN = high. The EN pin provides shutdown control independent of voltage detection logic, with 1.2 V VIH and 0.4 V VOL thresholds.

Key Specifications

Pinout & Package

Package: WDFN-10 (Case 516AA), 2.5 mm × 2.0 mm, 0.5 mm pitch, exposed thermal pads (PAD1 = GND, PAD2 = NMOS drain connected to Pins 4 & 5).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar overvoltage protection applications.

Compared with TPS259211DRCT and MAX16050ATA+, the NCP347MTAFTBG delivers a fully self-contained, single-chip solution with matched UVLO/OVLO thresholds, minimal external components, and guaranteed 50 ms startup timing - ideal for space-constrained, cost-sensitive portable devices where system-level simplicity is prioritized over ultra-low R_DS(on) or adjustable thresholds.

Availability

NCP347MTAFTBG is available at Aetrix Electronics and suitable for camera phone power management, digital still camera battery interface, and MP3 player USB charging path applications requiring stable component supply and long-term lifecycle support.

Supply support for NCP347MTAFTBG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The NCP347MTAFTBG belongs to onsemi's Overvoltage Protection Controller product line, engineered specifically for compact, high-reliability power path protection in battery-powered portable electronics with stringent size and ESD requirements.

FAQ

What is the exact overvoltage lockout (OVLO) threshold for NCP347MTAFTBG?

The NCP347MTAFTBG has a typical OVLO threshold of 5.90 V, with a min/max range of 5.70 V to 6.17 V across temperature and process variation. This value is factory-trimmed and specified in the Electrical Characteristics table under "Overvoltage Lockout Threshold" for part code 'F'. It is designed to protect 5 V systems from overvoltage without false triggering during normal ripple.

Does NCP347MTAFTBG require an external MOSFET?

No, the NCP347MTAFTBG integrates a low-R_DS(on) NMOS FET (65 mΩ typical) and internal charge pump, eliminating the need for any external pass transistor or gate driver. This makes it a complete, single-chip overvoltage protection solution - confirmed in the datasheet's title, features list, and functional block diagram.

How does the FLAG pin function on NCP347MTAFTBG?

The FLAG pin on NCP347MTAFTBG is an open-drain output that pulls low when VIN falls below UVLO (2.95 V) or rises above OVLO (5.90 V). It remains low during fault conditions and returns high only after VIN recovers and the internal 50 ms timer completes. An external pull-up resistor (typically 1 MΩ to VBAT ≥2.5 V) is mandatory per the Pin Function Description.

What is the thermal pad configuration for NCP347MTAFTBG?

NCP347MTAFTBG uses a WDFN-10 package with two exposed pads: PAD1 is electrically isolated and should be connected to PCB GND for thermal relief; PAD2 is internally connected to the NMOS drain and Pins 4 & 5 - it must be routed to the output net (not GND) to handle 2 A current and dissipate heat effectively, as detailed in the PCB Recommendations section.

Is NCP347MTAFTBG still in active production?

Per the official onsemi datasheet revision 5 (January 2026), NCP347MTAFTBG is marked "DISCONTINUED" in the Ordering Information table on page 12. However, Aetrix Electronics maintains legacy inventory and offers lifecycle management support, including cross-reference guidance and last-time-buy planning for ongoing production programs.