onsemi NCV8161BMX180TBG

Overview

NCV8161BMX180TBG from onsemi is an automotive-grade ultra-low-noise, high-PSRR LDO regulator delivering 450 mA output current at fixed 1.8 V with ±2% accuracy over −40°C to +125°C. It features 10 µV_RMS output noise, 98 dB PSRR at 1 kHz, and 225 mV dropout at 450 mA (XDFN4 package), optimized for RF and analog circuits in parking camera modules and infotainment systems.

For engineers reviewing the NCV8161BMX180TBG datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q100 Grade 1 qualification, absence of active discharge (distinguishing it from "A"-suffix variants), XDFN4 thermal performance (R_JA = 198°C/W), and compatibility with 1 µF ceramic input/output capacitors.

Technical Context

The NCV8161BMX180TBG employs a PMOS pass transistor architecture enabling low dropout and reverse-current protection via inherent body diode behavior. Its bandgap reference and integrated soft-start ensure stable startup under varying load and line conditions without external compensation.

Unlike versions with active discharge (e.g., NCV8161AMX180TBG), this "B" variant disables the internal 280 Ω discharge path when disabled - resulting in higher output hold-up time but lower quiescent current (18 µA typ.) and no intentional output pull-down during shutdown.

Key Specifications

Pinout & Package

XDFN4 package (1.0 mm × 1.0 mm, 0.65 mm pitch) with exposed thermal pad (EPAD) for enhanced heat dissipation. Pin 1 (IN), Pin 2 (GND), Pin 3 (EN), Pin 4 (OUT), and EPAD tied to GND plane for optimal thermal and EMI performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NCV8161BMX180TBG, the NCV8161AMX180TBG adds active discharge at the cost of slightly higher shutdown current, while the TPS7A2018PDQNR trades automotive qualification for lower quiescent current and higher thermal resistance - making NCV8161BMX180TBG the optimal choice for thermally constrained, safety-critical automotive 1.8 V rails.

Availability

NCV8161BMX180TBG is available at Aetrix Electronics and suitable for automotive infotainment systems, parking camera modules, and telematics control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for NCV8161BMX180TBG 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 specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.

The NCV8161 series is part of onsemi's automotive-qualified analog portfolio, designed specifically to deliver ultra-low-noise, high-PSRR power regulation for RF and imaging subsystems in vehicles meeting ISO 26262 ASIL readiness requirements.

FAQ

What is the key functional difference between NCV8161BMX180TBG and NCV8161AMX180TBG?

The NCV8161BMX180TBG lacks the active output discharge function present in the NCV8161AMX180TBG. When disabled, NCV8161BMX180TBG leaves the output floating (no intentional pull-down), whereas the "A" variant engages a 280 Ω discharge path to rapidly bring VOUT to GND. This makes NCV8161BMX180TBG preferable in systems where output hold-up is required during disable, such as preserving state in downstream logic or sensors.

Does NCV8161BMX180TBG require external capacitors, and what type is recommended?

Yes, NCV8161BMX180TBG requires both input (CIN) and output (COUT) capacitors. The datasheet specifies 1 µF X7R or X5R ceramic capacitors for both positions, placed as close as possible to the respective pins. These capacitors stabilize regulation, improve transient response, and reduce noise. Tantalum or aluminum electrolytic capacitors are not recommended due to their higher ESR and temperature sensitivity.

Is NCV8161BMX180TBG suitable for use with Li-ion battery inputs?

Yes, NCV8161BMX180TBG supports input voltages from 1.9 V to 5.5 V, making it compatible with single-cell Li-ion (2.7–4.2 V) and LiFePO₄ (2.0–3.6 V) batteries. With a 225 mV dropout at 450 mA in XDFN4, it can maintain regulated 1.8 V output down to a minimum input of 2.025 V - well within the discharge curve of most automotive-grade Li-based cells.

How does the thermal performance of NCV8161BMX180TBG compare between TSOP-5 and XDFN4 packages?

NCV8161BMX180TBG uses the XDFN4 package, which has a junction-to-ambient thermal resistance (R_JA) of 198°C/W - 20°C/W lower than the TSOP-5 variant (218°C/W). This improvement allows higher power dissipation or operation at elevated ambient temperatures without exceeding the 125°C max junction limit, especially when the EPAD is soldered to a thermal pad on the PCB.

What protection features are integrated into NCV8161BMX180TBG?

NCV8161BMX180TBG integrates overcurrent limiting (700 mA typical), short-circuit protection (690 mA at VOUT = 0 V), and thermal shutdown with hysteresis (trip at 160°C, reset at 140°C). It also includes internal soft-start to limit inrush current and reverse-current protection via the PMOS body diode. No external components are needed to enable these protections.