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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

onsemi NCP161AFCT450T2G

Name: NCP161AFCT450T2G
Brand: onsemi
SKU: NCP161AFCT450T2G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCP161AFCT450T2G

Manufacturer:: onsemi

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 4-XFBGA, WLCSP

Datasheet:: NCP161AFCT450T2G.pdf

Description:: IC REG LINEAR 4.5V 450MA 4WLCSP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

NCP161AFCT450T2G from onsemi is an ultra-low-noise, high-PSRR linear regulator delivering 450 mA output current with 4.5 V fixed output voltage, 150 mV dropout at full load, ±2% output accuracy over load/temperature, and 10 µV_RMS integrated noise (10 Hz–100 kHz). It serves as a precision power source for RF transceivers and analog signal chains in space-constrained mobile devices.

For engineers reviewing the NCP161AFCT450T2G datasheet, pinout, applications, or equivalent options, key selection criteria include its 98 dB PSRR at 1 kHz, 18 µA quiescent current, active discharge capability, WLCSP4 0.64 mm × 0.64 mm package, and compatibility with 1 µF ceramic input/output capacitors.

Technical Context

The NCP161AFCT450T2G employs a PMOS pass transistor architecture enabling ultra-low dropout and inherent reverse-current protection. Its bandgap reference and integrated soft-start ensure stable startup under varying load conditions without external compensation.

Designed specifically for RF/analog co-location, it achieves 98 dB PSRR at 1 kHz and 10 µV_RMS noise by combining low-noise internal circuitry with optimized layout-sensitive decoupling-requiring only 1 µF X7R/X5R ceramic capacitors on IN and OUT pins.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 4.5 V ±2% - eliminates external feedback network; ensures stable bias for RF power amplifiers and ADC references.
Max Output Current	450 mA - sufficient to power multi-core RF front-end ICs or high-speed analog sensor interfaces without thermal derating in WLCSP4 package.
Dropout Voltage	150 mV at 450 mA - enables operation from 4.65 V input (e.g., single-cell Li-ion at end-of-discharge), preserving system efficiency.
PSRR	98 dB at 1 kHz - suppresses switching noise from adjacent DC-DC converters, critical for LTE/Wi-Fi receiver sensitivity.
Output Noise	10 µV_RMS (10 Hz–100 kHz) - meets stringent phase-noise requirements of local oscillators and high-resolution SAR ADCs.
Quiescent Current	18 µA typical - extends battery life in always-on sensor nodes and standby modes of smartphones/tablets.
Enable Threshold	V_ENH = 1.2 V, V_ENL = 0.4 V - compatible with 1.8 V GPIO logic; supports precise sequencing in multi-rail systems.

Pinout & Package

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

Pin/Terminal	Circuit Role	Design Meaning
A1	IN	Input voltage supply pin - accepts 1.9 V to 5.5 V; requires 1 µF ceramic capacitor placed adjacent to minimize trace inductance.
A2	OUT	Regulated 4.5 V output - must be bypassed with 1 µF ceramic capacitor; low ESR/ESL critical for PSRR and transient response.
B1	EN	Chip enable control - <0.4 V disables regulator and activates 280 Ω active discharge; >1.2 V enables regulation.
B2	GND	Common ground reference - connects to PCB ground plane; exposed pad (EPAD) must be tied to GND for thermal performance.

Key Features

Feature	Design Value
Ultra-low noise	10 µV_RMS (10 Hz–100 kHz) - preserves SNR in RF receivers and dynamic range in audio codecs.
High PSRR	98 dB @ 1 kHz - rejects ripple from buck converters powering baseband processors without additional filtering.
Active output discharge	280 Ω pull-down when disabled - prevents floating outputs during power sequencing, ensuring clean state transitions.
Low quiescent current	18 µA typical - enables >1-year battery life in IoT sensors operating in deep-sleep mode with periodic wake-up.
Stable with 1 µF ceramics	No minimum ESR requirement - simplifies BOM and layout; eliminates need for tantalum or polymer capacitors.

Applications

RF Transceiver Power	Analog Sensor Interface
Use Scenario: Powering LTE/Wi-Fi RF front-end modules (PA, LNA, mixer) in smartphones and tablets. IC Role / Device Role / Timing Role: Low-noise, high-PSRR voltage source for RF signal chain biasing. Use Value: 10 µV_RMS noise and 98 dB PSRR prevent degradation of receiver sensitivity and EVM performance.	Use Scenario: Supplying precision op-amps, ADCs, and MEMS sensors in industrial condition monitoring nodes. IC Role / Device Role / Timing Role: Stable, low-drift analog rail for signal conditioning and digitization. Use Value: ±2% output accuracy and 150 mV dropout maintain accuracy across battery voltage sag and temperature variation.
Camera Image Signal Processor	Wearable Biometric Front-End
Use Scenario: Providing clean 4.5 V supply to CIS image signal processors and high-speed serializers in smartphone cameras. IC Role / Device Role / Timing Role: Dedicated LDO for noise-sensitive imaging pipeline components. Use Value: Fast load transient response (<±40 mV deviation) prevents image artifacts during auto-focus or flash activation.	Use Scenario: Powering optical heart-rate monitors and bio-impedance sensors in smartwatches and fitness bands. IC Role / Device Role / Timing Role: Ultra-low-I_Q regulator for always-on physiological sensing circuits. Use Value: 18 µA quiescent current extends coin-cell battery life beyond 6 months in continuous measurement mode.

RF Transceiver Power

Analog Sensor Interface

Use Scenario: Powering LTE/Wi-Fi RF front-end modules (PA, LNA, mixer) in smartphones and tablets.

IC Role / Device Role / Timing Role: Low-noise, high-PSRR voltage source for RF signal chain biasing.

Use Value: 10 µV_RMS noise and 98 dB PSRR prevent degradation of receiver sensitivity and EVM performance.

Use Scenario: Supplying precision op-amps, ADCs, and MEMS sensors in industrial condition monitoring nodes.

IC Role / Device Role / Timing Role: Stable, low-drift analog rail for signal conditioning and digitization.

Use Value: ±2% output accuracy and 150 mV dropout maintain accuracy across battery voltage sag and temperature variation.

Camera Image Signal Processor

Wearable Biometric Front-End

Use Scenario: Providing clean 4.5 V supply to CIS image signal processors and high-speed serializers in smartphone cameras.

IC Role / Device Role / Timing Role: Dedicated LDO for noise-sensitive imaging pipeline components.

Use Value: Fast load transient response (<±40 mV deviation) prevents image artifacts during auto-focus or flash activation.

Use Scenario: Powering optical heart-rate monitors and bio-impedance sensors in smartwatches and fitness bands.

IC Role / Device Role / Timing Role: Ultra-low-I_Q regulator for always-on physiological sensing circuits.

Use Value: 18 µA quiescent current extends coin-cell battery life beyond 6 months in continuous measurement mode.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Torex XC6210B452MR-G	450 mA, 4.5 V fixed, 250 mV dropout at 450 mA, 30 µV_RMS noise, SOT-25 package	Higher dropout and noise; lacks active discharge and WLCSP footprint	Select when board space allows SOT-25 and active discharge is not required.
Richtek RT9080-45GB	500 mA, 4.5 V fixed, 200 mV dropout at 450 mA, 20 µV_RMS noise, DFN-6 package	Higher quiescent current (25 µA), no active discharge, larger 1.2 mm × 1.2 mm footprint	Choose for higher current margin where 0.64 mm × 0.64 mm WLCSP is not mandatory.

Compared with Torex XC6210B452MR-G and Richtek RT9080-45GB, the NCP161AFCT450T2G delivers superior noise performance (10 µV_RMS vs. ≥20 µV_RMS), lower dropout (150 mV vs. ≥200 mV), and space-saving WLCSP4 packaging-making it optimal for RF-critical, size-constrained designs.

Availability

NCP161AFCT450T2G is available at Aetrix Electronics and suitable for battery-powered equipment, wireless LAN devices, and smartphones requiring stable component supply with consistent parametric performance and long-term lifecycle support.

Supply support for NCP161AFCT450T2G 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, medical, and IoT applications.

The NCP161 series is designed for ultra-low-noise, high-PSRR power delivery in RF and analog circuits-targeting mobile, wearable, and wireless infrastructure where signal integrity and battery life are paramount.

FAQ

What is the maximum input voltage rating for the NCP161AFCT450T2G?

The NCP161AFCT450T2G has an absolute maximum input voltage rating of 6 V. Operation above 5.5 V is outside the recommended operating range and may compromise reliability or parametric performance. The device is specified for 1.9 V to 5.5 V input operation, making it ideal for single-cell Li-ion (4.2 V max) and regulated 5 V bus applications.

Does the NCP161AFCT450T2G include active output discharge functionality?

Yes, the NCP161AFCT450T2G includes active output discharge. When the EN pin is pulled below 0.4 V, the internal 280 Ω discharge resistor connects the OUT pin to GND, rapidly discharging external capacitance. This feature is confirmed in the datasheet's "Enable Operation" section and distinguishes Version A (NCP161A) from non-discharge Version B variants.

What ceramic capacitor dielectric is recommended for use with the NCP161AFCT450T2G?

X7R or X5R dielectric ceramic capacitors are recommended for both input (C_IN) and output (C_OUT) decoupling with the NCP161AFCT450T2G. These dielectrics provide stable capacitance over temperature and DC bias-critical for maintaining PSRR and transient response. The datasheet explicitly states that 1 µF X7R/X5R capacitors meet all stability and performance requirements.

Can the NCP161AFCT450T2G operate with less than 1 µF output capacitance?

The NCP161AFCT450T2G is designed to remain stable with a minimum effective output capacitance of 0.7 µF, accounting for capacitance loss due to DC bias, temperature, and package size. However, the datasheet specifies 1 µF as the recommended value for guaranteed performance across all conditions-including worst-case DC bias in 0201-size capacitors-and for optimal load transient response.

Is the NCP161AFCT450T2G RoHS-compliant and lead-free?

Yes, the NCP161AFCT450T2G is Pb-free and RoHS-compliant, as confirmed in the "Features" section of the official onsemi datasheet (Rev. 20, May 2024). The WLCSP4 package uses lead-free solder bump technology and complies with JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) handling requirements.

NCP161AFCT450T2G Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: 4-XFBGA, WLCSP

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 4.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.21V @ 450mA

Current - Output:: 450mA

Current - Quiescent (Iq):: 23 µA

Current - Supply (Max):: -

PSRR:: 91dB ~ 48dB (100Hz ~ 100kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature, Soft Start

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 4-WLCSP (0.64x0.64)

NCP161AFCT450T2G FAQ

1.How can I place an order for NCP161AFCT450T2G through Aetrix?

Please submit a Request for Quotation (RFQ) for NCP161AFCT450T2G on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for NCP161AFCT450T2G reliable?

The price and inventory of NCP161AFCT450T2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP161AFCT450T2G is usually 5 days.

3.What payment methods are accepted for NCP161AFCT450T2G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP161AFCT450T2G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCP161AFCT450T2G?

NCP161AFCT450T2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCP161AFCT450T2G order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for NCP161AFCT450T2G?

For technical support, including NCP161AFCT450T2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP161AFCT450T2G requirements.

6.How does Aetrix verify that NCP161AFCT450T2G is sourced from the original manufacturer or authorized distributors?

All NCP161AFCT450T2G products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that NCP161AFCT450T2G meets industry standards.

7.What is the process for return or replacement of NCP161AFCT450T2G?

All NCP161AFCT450T2G units undergo pre-shipment inspection (PSI). If there is an issue with NCP161AFCT450T2G, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The NCP161AFCT450T2G part is unused and in its original packaging.

Return procedure for NCP161AFCT450T2G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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