onsemi NCP161BMX514TBG

Overview

NCP161BMX514TBG from onsemi is a 450 mA ultra-low-noise, high-PSRR LDO regulator with fixed 5.14 V output, 150 mV dropout at full load, ±2% output accuracy over load/temperature, and 10 µV_RMS integrated noise (10 Hz–100 kHz). Designed for RF and analog circuits in space-constrained portable devices, it operates from 1.9 V to 5.5 V input and supports stable regulation with only 1 µF ceramic input/output capacitors.

For engineers reviewing the NCP161BMX514TBG datasheet, pinout, applications, or equivalent options, key selection criteria include its 5.14 V fixed output, absence of active discharge (distinguishing it from "A" variants), XDFN4 1 mm × 1 mm package, 98 dB PSRR at 1 kHz, and thermal shutdown at 160°C - critical for battery-powered RF subsystems requiring clean, stable biasing.

Technical Context

The NCP161BMX514TBG employs a PMOS pass transistor architecture enabling low dropout and inherent reverse-current protection. Its bandgap reference and integrated soft-start ensure precise 5.14 V regulation with minimal line/load transients - ±1 mV line transient and ±40 mV load transient under specified test conditions.

Unlike "A"-suffix variants, the "B" version omits active output discharge; EN pin logic remains identical (enable >1.2 V, disable <0.4 V), but discharge resistance is not implemented. It delivers 98 dB PSRR at 1 kHz and maintains stability with 0.7–1 µF X7R/X5R ceramic capacitors, targeting noise-sensitive analog rails in smartphones and wireless LAN ICs.

Key Specifications

Pinout & Package

XDFN4 package: 1 mm × 1 mm × 0.4 mm, exposed pad (EPAD) for thermal dissipation, RoHS-compliant Pb-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with XC6210B514MR-G and BD73520EFJ-M, the NCP161BMX514TBG uniquely combines exact 5.14 V output, industry-leading 10 µV_RMS noise, and XDFN4's 1 mm² footprint - making it optimal for next-gen compact RF modules where voltage precision, noise floor, and board area are simultaneously constrained.

Availability

NCP161BMX514TBG is available at Aetrix Electronics and suitable for smartphone RF front-ends, Wi-Fi 6E transceivers, and industrial wireless sensor nodes requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for NCP161BMX514TBG 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 delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and edge applications - with emphasis on high-performance analog, power management, and sensing technologies.

The NCP161 series is designed specifically for RF and high-fidelity analog circuits, prioritizing ultra-low noise, high PSRR, and minimal dropout to enable cleaner signal chains in battery-constrained, high-density portable electronics.

FAQ

What is the output voltage tolerance of the NCP161BMX514TBG over temperature and load?

The NCP161BMX514TBG guarantees ±2% output voltage accuracy across −40°C to +125°C junction temperature and 0–450 mA load range. This tight tolerance ensures reliable operation of 5.14 V–specified RF ICs without external trimming, even under thermal stress or dynamic loading in handheld devices.

Does the NCP161BMX514TBG include active output discharge?

No, the NCP161BMX514TBG does not include active output discharge. The "B" suffix denotes the non-active-discharge variant; unlike "A" versions, it lacks the internal 280 Ω discharge resistor. When disabled via EN, the output floats rather than being pulled to GND - critical for systems requiring controlled discharge sequencing.

What is the minimum recommended output capacitor for stable operation of the NCP161BMX514TBG?

The NCP161BMX514TBG is stable with a minimum 0.7 µF effective capacitance, but the datasheet recommends a 1 µF X7R or X5R ceramic capacitor placed adjacent to the OUT pin. This value ensures robustness against DC bias, temperature drift, and ESL-induced instability in high-frequency RF environments.

How does the thermal performance of the NCP161BMX514TBG compare across package types?

In its XDFN4 package, the NCP161BMX514TBG has a junction-to-ambient thermal resistance (R_JA) of 198.1°C/W (JEDEC board). This is significantly lower than the SOT23-5 variant (218°C/W) and enables higher continuous power dissipation - especially when the EPAD is fully soldered to a 2 oz copper ground plane per layout guidelines.

Can the NCP161BMX514TBG be used with input voltages below its nominal output voltage?

No - the NCP161BMX514TBG requires VIN ≥ VOUT + dropout. With a 5.14 V output and 150 mV dropout at 450 mA, minimum input is 5.29 V. Operation below this violates LDO regulation; however, the PMOS pass device blocks reverse current if VOUT > VIN, preventing backfeeding in multi-rail systems.