onsemi NCP361MUTBG

Overview

NCP361MUTBG from onsemi is a USB-positive overvoltage protection controller with integrated PMOS FET, 5.675 V overvoltage lockout (OVLO), 3.0 V undervoltage lockout (UVLO), and 750 mA overcurrent protection. It delivers <200 mV dropout at 500 mA and features an open-drain FLAG output for fault reporting in portable USB-powered systems.

For engineers reviewing the NCP361MUTBG datasheet, pinout, applications, or equivalent options, this device supports rapid fault detection (<1.5 µs output turn-off), thermal shutdown at 150 °C, and IEC61000-4-2 Level 4 ESD protection - critical for USB interface robustness in mobile and peripheral designs.

Technical Context

The NCP361MUTBG implements dual voltage monitoring: UVLO (2.85–3.15 V) ensures safe startup only above valid supply levels, while OVLO (5.43–5.9 V) triggers immediate PMOS gate disablement to isolate downstream circuitry. Its internal PMOS provides bidirectional current path control without external components.

Overcurrent protection operates at 550–950 mA with automatic hiccup-mode recovery, and thermal shutdown (150 °C ±30 °C hysteresis) prevents latch-up during sustained overload. The FLAG pin asserts low on any fault condition - OVLO, UVLO, OCP, or thermal - enabling host MCU coordination.

Key Specifications

Pinout & Package

Package: UDFN6 (2 mm × 2 mm, 0.65 mm pitch), Pb-free, exposed thermal pad (Case 517AB). Thermal resistance R_JA = 240 °C/W with recommended PCB copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TUSB542IRWBR and TPD3S014TDCR, the NCP361MUTBG uniquely integrates both PMOS switch and fault-flag logic in a 2×2 mm UDFN package, delivering complete single-chip USB power path protection without external active components - ideal for space-constrained portable designs.

Availability

NCP361MUTBG is available at Aetrix Electronics and suitable for USB mobile charging ports, peripheral interfaces, portable media players, set-top box host ports, and automotive infotainment USB hubs requiring stable component supply and long-term lifecycle support.

Supply support for NCP361MUTBG 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, and sensor solutions for automotive, industrial, and consumer markets.

The NCP361MUTBG belongs to onsemi's USB interface protection product line, engineered specifically to simplify robust VBUS conditioning in portable and embedded USB applications with minimal external components.

FAQ

What is the overvoltage lockout (OVLO) threshold of the NCP361MUTBG?

The NCP361MUTBG has a typical overvoltage lockout threshold of 5.675 V, with a min/max range of 5.43 V to 5.9 V. This threshold triggers immediate disconnection of the internal PMOS FET to protect downstream circuitry when input voltage exceeds the limit. The device also includes 100 mV hysteresis to prevent chatter during transient overvoltage events. The NCP361MUTBG maintains this specification across its full operating temperature range of −40 °C to +85 °C.

Does the NCP361MUTBG require external components to function?

The NCP361MUTBG requires only two external capacitors: a ≥1 µF low-ESR ceramic capacitor between IN and GND, and another ≥1 µF capacitor on the OUT pins. An external pull-up resistor (10 kΩ–1 MΩ) on the FLAG pin is mandatory due to its open-drain configuration. No external MOSFET, gate driver, or voltage reference is needed - the internal PMOS FET and all protection circuitry are fully integrated. The NCP361MUTBG is designed for minimal external component count in USB power path applications.

How does the FLAG output of the NCP361MUTBG behave during fault conditions?

The FLAG output of the NCP361MUTBG is an open-drain, active-low signal that pulls low during any fault: overvoltage (IN > OVLO), undervoltage (IN < UVLO), overcurrent (I_LOAD > I_LIM), or thermal shutdown (T_J > 150 °C). It remains low until all fault conditions clear and the device recovers. The NCP361MUTBG specifies ≤400 mV low-level voltage at 1 mA sink current, and requires an external pull-up resistor to VCC for proper logic-level interpretation by the host MCU.

What package type is used for the NCP361MUTBG?

The NCP361MUTBG uses the UDFN6 (2 mm × 2 mm, 0.65 mm pitch) package, designated Case 517AB, with an exposed thermal pad for enhanced heat dissipation. It is Pb-free and RoHS-compliant. This compact 6-pin package supports R_JA = 240 °C/W with proper PCB copper area, enabling reliable 600 mA continuous operation. The NCP361MUTBG pinout differs from the TSOP-5 variant (e.g., NCP361SNT1G), with dual OUT pins and relocated EN/FLAG positions.

Can the NCP361MUTBG be used in automotive applications?

The NCP361MUTBG is rated for industrial temperature range (−40 °C to +85 °C) and is not AEC-Q100 qualified. For automotive applications, onsemi offers the NCV361SNT1G - an automotive-grade variant with identical functionality, AEC-Q100 qualification, and PPAP capability. The NCP361MUTBG is intended for consumer, computing, and industrial USB applications where extended temperature or automotive qualification is not required. Always verify ambient and junction temperature margins in final layout when using the NCP361MUTBG in demanding environments.