onsemi NCP360SNAFT1G

Overview

NCP360SNAFT1G from onsemi is a USB-positive overvoltage protection controller with integrated PMOS FET, 7.07 V typical OVLO threshold, 3.0 V typical UVLO threshold, and open-drain FLAG output for fault indication - deployed in mobile phones and USB peripheral power paths to prevent damage from VBUS overvoltage events up to +20 V.

For engineers reviewing the NCP360SNAFT1G datasheet, pinout, applications, or equivalent options, this page delivers verified functional role, validated TSOP-5 pin mapping, confirmed OVLO/UVLO thresholds, thermal shutdown behavior, ESD immunity (15 kV air), and real-world selection guidance against comparable overvoltage protectors.

Technical Context

The NCP360SNAFT1G implements dual voltage monitoring: an undervoltage lockout (UVLO) circuit disables output below 3.0 V (typical), while an overvoltage lockout (OVLO) circuit disconnects output above 7.07 V (typical), both with hysteresis for noise immunity. Its internal PMOS FET provides 600 mA continuous current capability with <200 mV dropout at 500 mA.

It features an open-drain FLAG output that asserts low within 1.0–2.0 µs of OVLO detection, an EN input enabling system-level shutdown independent of voltage faults, and thermal shutdown at 150 °C with 30 °C hysteresis - all housed in a Pb-free TSOP-5 package with exposed thermal pad compatibility.

Key Specifications

Pinout & Package

Package: TSOP-5 (3.00 × 1.50 × 0.95 mm, 0.95 mm pitch), Pb-free, with thermal pad (PAD1 not present in TSOP-5 variant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TUSB544RGER and TPD3S014TDR, the NCP360SNAFT1G uniquely combines fixed 7.07 V OVLO, 3.0 V UVLO, EN control, thermal shutdown, and fast FLAG signaling in a minimal 5-pin TSOP package - making it optimal for cost-sensitive, space-constrained USB power path protection where precise voltage window enforcement is critical.

Availability

NCP360SNAFT1G is available at Aetrix Electronics and suitable for USB peripheral protection, smartphone charging port hardening, and portable media player power path management requiring stable component supply across industrial and consumer production cycles.

Supply support for NCP360SNAFT1G 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The NCP360SNAFT1G belongs to onsemi's USB interface protection product line, engineered specifically for robust, low-footprint overvoltage and ESD safeguarding of USB power rails in portable and battery-powered systems.

FAQ

What is the exact overvoltage lockout (OVLO) threshold for NCP360SNAFT1G?

The NCP360SNAFT1G has a typical OVLO threshold of 7.07 V, with a guaranteed range of 7.0 V to 7.4 V across temperature and process variation. This value is factory-trimmed and fixed for the SNAF variant, as confirmed in the Electrical Characteristics table on page 5 of the official datasheet. The NCP360SNAFT1G uses this threshold to instantly disconnect the OUT pin from IN when V_IN exceeds this level, protecting downstream USB circuitry.

Does NCP360SNAFT1G include undervoltage lockout (UVLO), and what is its threshold?

Yes, the NCP360SNAFT1G includes a built-in undervoltage lockout (UVLO) function with a typical threshold of 3.0 V and a guaranteed range of 2.85 V to 3.15 V. It prevents the output from enabling until V_IN rises above this level, ensuring stable USB bus operation before power is delivered. This UVLO behavior is intrinsic to the NCP360SNAFT1G and does not require external components - critical for reliable device enumeration in USB applications.

How does the FLAG output of NCP360SNAFT1G behave during an overvoltage event?

The FLAG output of NCP360SNAFT1G is an open-drain signal that pulls low within 1.0–2.0 µs after V_IN exceeds the OVLO threshold. It remains low until V_IN falls below OVLO − hysteresis (≥100 mV). An external pull-up resistor (typically 1 MΩ to V_BAT) is mandatory. This behavior is fully characterized for the NCP360SNAFT1G and enables immediate microcontroller interrupt-driven fault response without additional logic.

Can NCP360SNAFT1G be used with a 3.3 V enable signal?

Yes, the EN pin of NCP360SNAFT1G accepts 3.3 V logic: V_IH is specified at 1.2 V minimum, so a 3.3 V GPIO safely enables shutdown mode. When EN is pulled high (>1.2 V), the NCP360SNAFT1G forces output disconnect regardless of V_IN level - a feature independent of OVLO/UVLO detection. This allows system-level power sequencing control, and the NCP360SNAFT1G maintains this behavior across its full operating temperature range.

What is the maximum continuous current rating for NCP360SNAFT1G, and how is it affected by PCB layout?

The NCP360SNAFT1G supports 600 mA continuous current under proper thermal conditions, as specified in the Maximum Ratings table. Its R_DS(on) is optimized for low dropout (<200 mV at 500 mA), but actual current capability depends on PCB copper area: with 200 mm² heat spreader, thermal resistance drops to 260 °C/W, enabling full 600 mA at 85 °C ambient. The NCP360SNAFT1G datasheet explicitly ties current derating to θ_JA, not just package alone.