onsemi NCP347MTAHTBG

Overview

NCP347MTAHTBG from onsemi is a positive overvoltage protection controller with integrated 65 mΩ NMOS FET, UVLO (2.95 V typ), OVLO (7.20 V typ), 50 ms startup delay, and open-drain FLAG output-designed for battery-powered portable electronics requiring robust input voltage fault detection and automatic system disconnect.

For engineers reviewing the NCP347MTAHTBG datasheet, pinout, applications, or equivalent options, this page delivers verified electrical thresholds, thermal derating guidance, FLAG timing behavior, EN-controlled shutdown sequence, and WDFN-10 package layout constraints critical for reliable overvoltage-protected power path design.

Technical Context

The NCP347MTAHTBG implements a state-machine-based protection architecture with independent UVLO (2.8–3.1 V) and OVLO (6.80–7.50 V) comparators, internal charge pump enabling gate drive for its integrated 2 A-rated NMOS, and a 50 ms power-up delay before output enable. Its FLAG pin provides asynchronous fault indication with <1.0 µs alert delay upon overvoltage detection.

Operation relies on three hardwired IN pins (1, 4, 5) sharing input supply and two OUT pins (6, 7) delivering regulated output; PAD2 connects directly to the NMOS drain for thermal management, while EN (Pin 10) forces immediate output disable without affecting fault monitoring-ensuring continuous FLAG reporting even during shutdown.

Key Specifications

Pinout & Package

Package: 10-pin WDFN (2.5 mm × 2.0 mm, 0.5 mm pitch), Pb-free, case 516AA. Exposed PAD2 electrically connected to internal NMOS drain; PAD1 isolated and recommended for grounding to improve thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCP347MTAHTBG, TPS259211DRCT offers wider voltage range but adds complexity for FLAG functionality, while MAX14522ETA+ trades integration for flexibility in low-VIN scenarios-neither matches the NCP347MTAHTBG's combined UVLO/OVLO/FLAG/NMOS integration in a 2.5×2 mm WDFN package.

Availability

NCP347MTAHTBG is available at Aetrix Electronics and suitable for smartphone battery protection, digital camera power management, MP3 player charging circuits, portable medical monitor input stages, and other applications requiring stable component supply with guaranteed long-term availability planning.

Supply support for NCP347MTAHTBG 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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP347 product line targets portable electronics power integrity, integrating overvoltage/undervoltage lockout, protected switching, and fault signaling into single-chip solutions for space-constrained battery-powered devices.

FAQ

What is the exact overvoltage lockout (OVLO) threshold for NCP347MTAHTBG?

The NCP347MTAHTBG has a nominal OVLO threshold of 7.20 V, with a guaranteed range of 6.80 V to 7.50 V across temperature (−40 °C to +85 °C). This value is fixed per the "H" suffix in the part number and confirmed in the Selection Guide on page 12 of the datasheet. The NCP347MTAHTBG does not support user-adjustable OVLO; alternative variants (e.g., NCP347MTAITBG) offer different thresholds.

Does NCP347MTAHTBG remain functional when the EN pin is asserted high?

Yes-the NCP347MTAHTBG continues monitoring input voltage and asserting the FLAG pin during EN = high. While EN = high forces immediate output disconnect (VOUT open), the internal UVLO and OVLO comparators remain active, and FLAG will go low if Vin falls below UVLO or exceeds OVLO. This allows host systems to log faults even in shutdown mode, a key feature confirmed in the Functional Block Diagram and PIN FUNCTION DESCRIPTION on page 3.

How should the FLAG pin of NCP347MTAHTBG be interfaced with a microcontroller?

The FLAG pin of NCP347MTAHTBG is an open-drain output requiring an external pull-up resistor to a supply ≥2.5 V (e.g., VBAT or 3.3 V). A 1 MΩ resistor is typical; values down to 10 kΩ are acceptable. The microcontroller GPIO should be configured as an interrupt-capable input with internal pull-up disabled. FLAG goes low within 1.0 µs of fault detection, enabling precise timing-critical fault capture-verified in Figure 4 and Electrical Characteristics table on page 4.

What thermal considerations apply to NCP347MTAHTBG in a 2 A load application?

At 2 A load and 65 mΩ R_DS(on), NCP347MTAHTBG dissipates ~260 mW (I²R). With R_JA = 280 °C/W (minimum copper), junction rise is ~73 °C above ambient-well within the 150 °C TJ limit. To maintain reliability, connect PAD2 (NMOS drain) to ≥100 mm² copper pour and ground PAD1. Per page 10, increasing copper area to 400 mm² reduces R_JA to 189 °C/W, lowering ΔT to ~49 °C.

Is NCP347MTAHTBG still in production despite discontinuation notices for other variants?

Yes-NCP347MTAHTBG remains orderable per the Ordering Information table on page 12, where it is listed with "WDFN-10 (Pb-Free)" and "3000 / Tape & Reel" shipping. Although NCP347MTAFTBG and NCP347MTAITBG are marked discontinued, NCP347MTAHTBG is explicitly excluded from that notice and retains active status as of Revision 5 (January 2026).