onsemi NCP160AFCS450T2G

Overview

NCP160AFCS450T2G from onsemi is a 250 mA ultra-low-noise, high-PSRR LDO regulator with 4.5 V fixed output voltage, 80 mV dropout at full load, ±2% output accuracy over load/temperature, and active output discharge. It delivers 10 µV_RMS noise (10 Hz–100 kHz) and 98 dB PSRR at 1 kHz, making it ideal for powering RF transceivers and precision analog circuitry in space-constrained mobile devices.

For engineers reviewing the NCP160AFCS450T2G datasheet, pinout, applications, or equivalent options, key selection criteria include its WLCSP4 0.64 mm × 0.64 mm package, 18 µA quiescent current, thermal shutdown (160°C), enable-controlled active discharge (280 Ω), and stability with 1 µF ceramic capacitors.

Technical Context

The NCP160AFCS450T2G integrates a PMOS pass transistor with internal bandgap reference, soft-start, current limiting (700 mA typ.), and thermal shutdown (160°C trip, 140°C reset). Its EN pin controls both regulation and active discharge-pulling EN < 0.4 V disables the LDO and engages the 280 Ω discharge path to GND.

Designed specifically for RF/analog supply rails, it achieves ultra-low noise via optimized internal biasing and high PSRR through multi-stage error amplifier architecture. The device operates across 1.9–5.5 V input and maintains regulation down to 80 mV dropout at 250 mA with 4.5 V output-critical for battery-powered systems near end-of-life voltage.

Key Specifications

Pinout & Package

Package: WLCSP4 (Case 567JZ), 0.64 mm × 0.64 mm × 0.33 mm, Pb-free, RoHS-compliant. Exposed pad (EPAD) tied to GND for thermal relief.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with Torex XC6210B452MR-G and Richtek RT9080-45GB, the NCP160AFCS450T2G provides superior noise performance (10 µV_RMS vs. ≥15 µV_RMS), lower dropout (80 mV vs. ≥120 mV), and integrated active discharge-enabling cleaner power-down in compact, battery-sensitive RF systems.

Availability

NCP160AFCS450T2G is available at Aetrix Electronics and suitable for wireless transceiver power, portable audio bias, and medical sensor analog front-end applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for NCP160AFCS450T2G 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 NCP160 series targets ultra-low-noise, high-PSRR LDO regulation for RF and analog circuits in battery-powered portable electronics-emphasizing minimal footprint, low IQ, and robust transient response.

FAQ

What is the maximum input voltage for the NCP160AFCS450T2G?

The NCP160AFCS450T2G supports an absolute maximum input voltage of 6 V. Its recommended operating input range is 1.9 V to 5.5 V. Operation above 5.5 V risks exceeding safe operating area limits and may cause permanent damage, even briefly. For 4.5 V output, minimum functional input is 4.58 V (accounting for 80 mV dropout).

Does the NCP160AFCS450T2G require external capacitors, and what type is recommended?

Yes, the NCP160AFCS450T2G requires both input (C_IN) and output (C_OUT) ceramic capacitors. onsemi specifies 1 µF X7R or X5R dielectric capacitors placed as close as possible to the IN and OUT pins. These capacitors ensure stability, low impedance for noise filtering, and optimal transient response. Tantalum or electrolytic types are not recommended due to high ESR.

How does the active discharge function work on the NCP160AFCS450T2G?

When the EN pin voltage drops below 0.4 V, the NCP160AFCS450T2G disables regulation and activates an internal 280 Ω discharge path from OUT to GND. This rapidly discharges the output capacitor, preventing floating voltages and ensuring predictable power-down behavior in multi-rail systems. Discharge current is limited to avoid excessive inrush into downstream loads.

What is the thermal performance of the NCP160AFCS450T2G in its WLCSP4 package?

In the WLCSP4 (0.64 mm × 0.64 mm) package, the NCP160AFCS450T2G has a junction-to-ambient thermal resistance (R_θJA) of 108 °C/W under standard JEDEC test conditions. With proper PCB copper area (≥200 mm² 1 oz Cu), it safely dissipates up to ~350 mW at 25°C ambient. Thermal shutdown triggers at 160°C junction temperature and resets at 140°C.

Is the NCP160AFCS450T2G pin-compatible with other variants in the NCP160 family?

Yes, all WLCSP4-packaged NCP160 variants-including NCP160AFCS450T2G-share identical pinout (IN, OUT, EN, GND) and mechanical footprint (Case 567JZ). Voltage variants (e.g., 3.3 V, 5.14 V) and discharge options (A-series with active discharge, B-series without) are drop-in replacements at the board level, provided output voltage and enable logic match system requirements.