onsemi NCP161BFCS180T2G

Overview

NCP161BFCS180T2G from onsemi is a 450 mA ultra-low-noise, high-PSRR LDO regulator with fixed 1.8 V output, designed for RF and analog circuits in space-constrained portable devices. It delivers ±2% output accuracy over load/temperature, 150 mV dropout at 450 mA, 10 µV_RMS output noise, and 98 dB PSRR at 1 kHz - enabling clean power for sensitive 5G front-end modules and camera ISP cores.

For engineers reviewing the NCP161BFCS180T2G datasheet, pinout, applications, or equivalent options, this page provides verified package mapping (WLCSP4, 0.64 mm × 0.64 mm), validated thermal performance (R_JA = 108 °C/W), confirmed active-discharge exclusion, and real-world transient response data for battery-powered wireless designs.

Technical Context

The NCP161BFCS180T2G uses a PMOS pass transistor architecture to achieve low dropout and reverse-current blocking. Its bandgap reference and integrated soft-start ensure stable startup under light-to-heavy load transitions without external compensation.

Unlike version-A variants, this B-suffix device omits active output discharge (no internal 280 Ω pull-down), simplifying use in systems where controlled discharge is managed externally or unnecessary. It operates across 1.9–5.5 V input while maintaining ultra-low 18 µA quiescent current and 0.1 µA shutdown current.

Key Specifications

Pinout & Package

Package: WLCSP4 (0.64 mm × 0.64 mm × 0.33 mm), Pb-free, RoHS-compliant, bottom-side UBM metallization (180 µm ±5 µm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B182MR-G and RT9080AL-18GJ6F, the NCP161BFCS180T2G uniquely balances ultra-low noise (10 µV_RMS), minimal footprint (0.64 mm × 0.64 mm), and precise 1.8 V regulation - making it optimal for RF-critical, size-constrained portable designs where active discharge is not needed.

Availability

NCP161BFCS180T2G is available at Aetrix Electronics and suitable for 5G smartphone front-end modules, automotive ADAS camera ISPs, and wireless earbud ANC processors requiring stable component supply with guaranteed long-term lifecycle support.

Supply support for NCP161BFCS180T2G 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 leader focused on energy-efficient innovation for automotive, industrial, cloud, and intelligent edge applications.

The NCP161 series was engineered specifically for RF and high-performance analog circuits - prioritizing ultra-low noise, high PSRR, and minimal quiescent current in ultra-small packages like WLCSP4 and XDFN4.

FAQ

What is the dropout voltage specification for NCP161BFCS180T2G at full 450 mA load?

The NCP161BFCS180T2G has a typical dropout voltage of 150 mV at 450 mA output current and 1.8 V nominal output. This value is measured when V_OUT drops 100 mV below nominal - confirming reliable operation down to 1.95 V input under full load, critical for single-cell Li-ion applications.

Does NCP161BFCS180T2G include active output discharge functionality?

No, NCP161BFCS180T2G does not include active output discharge. The "B" suffix explicitly denotes the non-active-discharge variant. When disabled via the EN pin, the output floats rather than being pulled to GND through an internal resistor - unlike the "A"-suffix versions which integrate a 280 Ω discharge path.

Which package type and dimensions does NCP161BFCS180T2G use?

NCP161BFCS180T2G uses the WLCSP4 package (Case 567KA), measuring 0.64 mm × 0.64 mm × 0.33 mm with 180° marking rotation. It features bottom-side UBM metallization (180 µm ±5 µm) and is Pb-free/RoHS-compliant - optimized for ultra-dense mobile PCB layouts.

What is the maximum PSRR performance of NCP161BFCS180T2G and at what frequency?

The NCP161BFCS180T2G achieves a typical PSRR of 98 dB at 1 kHz with 20 mA load current. PSRR remains high across frequency: 91 dB at 100 Hz, 82 dB at 10 kHz, and 48 dB at 100 kHz - enabling robust rejection of mid-frequency switching noise from nearby DC-DC converters.

Can NCP161BFCS180T2G operate with ceramic capacitors smaller than 1 µF on input and output?

Yes - the NCP161BFCS180T2G is stable with as little as 0.7 µF effective output capacitance (accounting for DC bias and temperature derating). However, 1 µF X7R/X5R ceramic capacitors are recommended for optimal line/load transient response and PSRR performance across temperature.