NXP Semiconductors NX3P191UK,012

Overview

NX3P191UK,012 from NXP Semiconductors is a logic-controlled high-side load switch featuring a P-channel MOSFET with 95 mΩ typical ON resistance at 1.8 V supply, 500 mA continuous current capability, and integrated output discharge (280 Ω). It operates from 1.1 V to 3.6 V and delivers ultra-low shutdown current (≤2 μA) for power domain isolation in portable battery-powered systems.

For engineers reviewing the NX3P191UK,012 datasheet, NX3P191UK,012 pinout, NX3P191UK,012 application, or NX3P191UK,012 equivalent, key selection criteria include input voltage range compatibility (1.1–3.6 V), enable logic level translation (1.2 V compatible at 3.6 V VIN), thermal resistance (130 K/W), and WLCSP4 package constraints for space-constrained PCB layouts.

Technical Context

The NX3P191UK,012 integrates slew rate control to limit inrush current during turn-on and an internal 280 Ω discharge resistor to actively sink output capacitance when disabled. Its enable input supports logic-level translation across the full 1.1–3.6 V supply range, allowing direct interface with low-voltage processors without external level shifters.

It uses a P-channel MOSFET architecture with ground-referenced control, delivering low ground current (≤2 μA) in shutdown and maintaining stable ON resistance down to 65 mΩ at 3.6 V VIN. The device is specified for operation from −40 °C to +85 °C and features HBM ESD protection exceeding 4000 V.

Key Specifications

Pinout & Package

Package: WLCSP4 - wafer-level chip-scale package, 0.76 × 0.76 × 0.51 mm body with backside coating, suitable for ultra-compact mobile PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side load switch applications.

Compared with NX3P191UK,012, the TPS22915YZPR offers lower conduction loss but increases design complexity with external discharge and pull-down, while the BD75020GUL supports deeper low-voltage operation but lacks the flexible level-translating EN needed for mixed-voltage SoC interfaces.

Availability

NX3P191UK,012 is available at Aetrix Electronics and suitable for smartphone power rail switching, digital camera sensor control, wireless earbud charging case management, portable medical monitor backlighting, and other battery-sensitive applications requiring stable component supply and long-term lifecycle assurance.

Supply support for NX3P191UK,012 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and consumer markets.

The NX3P series is designed specifically for ultra-low-power, space-constrained portable electronics, delivering high-side load switching with integrated discharge, slew control, and wide-voltage logic compatibility.

FAQ

What is the maximum continuous current rating for NX3P191UK,012 at +85 °C ambient?

The NX3P191UK,012 supports 500 mA continuous current at +85 °C ambient temperature, as specified in Table 5 (Limiting Values) and confirmed in the Recommended Operating Conditions section. This rating accounts for thermal derating and ensures safe operation without exceeding the 125 °C maximum junction temperature under typical PCB layout conditions.

Does NX3P191UK,012 require an external pull-down resistor on the EN pin?

No, NX3P191UK,012 includes an internal 4 MΩ pull-down resistor on the EN pin, as documented in Table 8 (Static Characteristics). This eliminates the need for an external component and ensures predictable OFF-state behavior when the EN signal is floating or high-impedance.

What is the purpose of the internal 280 Ω discharge resistor in NX3P191UK,012?

The internal 280 Ω discharge resistor in NX3P191UK,012 provides a controlled path to ground for VOUT capacitance when the device is disabled. This ensures rapid discharge of downstream capacitive loads - typically completing within ~1 ms - preventing residual voltage from interfering with subsequent power-up sequences or causing latch-up in connected ICs.

Can NX3P191UK,012 operate with a 1.2 V supply voltage?

Yes, NX3P191UK,012 is fully specified for operation down to 1.1 V supply voltage, including functional enable logic and 150 mΩ typical ON resistance at 1.2 V VIN. Its level-translating EN input remains valid across the entire 1.1–3.6 V range, supporting direct interface with 1.2 V I/O domains.

What package type and dimensions does NX3P191UK,012 use?

NX3P191UK,012 uses the WLCSP4 package: a wafer-level chip-scale package with 4 bumps, body dimensions of 0.76 mm × 0.76 mm × 0.51 mm, and backside coating. Pin mapping follows the standard ball configuration - VIN (A1), EN (B1), VOUT (A2), GND (B2) - as shown in Figure 3 and Table 2 of the datasheet.