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onsemi NCP161AFCT285T2G
- Part No.:
- NCP161AFCT285T2G
- Manufacturer:
- onsemi
- Package:
- 4-XFBGA, WLCSP
- Datasheet:
-
NCP161AFCT285T2G.pdf
- Description:
- IC REG LINEAR 2.85V 450MA 4WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:3,791
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Product details
Overview
NCP161AFCT285T2G from onsemi is a 450 mA ultra-low-noise, high-PSRR LDO regulator with fixed 2.85 V output, ±2% accuracy over load/temperature, 150 mV dropout at 450 mA, and 10 µVRMS output noise - designed for RF and analog power rails in smartphones and wireless LAN devices.
For engineers reviewing the NCP161AFCT285T2G datasheet, pinout, applications, or equivalent options, key selection criteria include its active discharge capability, compatibility with 1 µF ceramic input/output capacitors, thermal shutdown (160°C), and WLCSP4 0.64 mm × 0.64 mm × 0.33 mm package for space-constrained RF subsystems.
Technical Context
The NCP161AFCT285T2G uses a PMOS pass transistor architecture enabling low dropout and inherent reverse-current protection. Its bandgap reference and integrated soft-start ensure stable regulation during enable transitions, while internal current limiting (700 mA typ.) and thermal shutdown provide robust fault handling.
It delivers ultra-high PSRR (98 dB at 1 kHz, 20 mA load) and ultra-low noise (10 µVRMS, 10 Hz–100 kHz) by minimizing internal voltage reference fluctuations and optimizing feedback loop stability - critical for powering sensitive RF transceivers and high-resolution ADCs without introducing supply-induced jitter or distortion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.85 V ±2% - eliminates external resistor network, ensures precise biasing for 2.8 V–2.9 V RF front-end ICs. |
| Max Output Current | 450 mA continuous - supports moderate-power RF power amplifiers and analog signal chains without thermal derating in compact layouts. |
| Dropout Voltage | 170 mV typ. at 450 mA - enables operation from 3.02 V input (e.g., single-cell Li-ion at end-of-discharge) while maintaining regulation. |
| PSRR | 98 dB at 1 kHz (20 mA load) - suppresses switching noise from adjacent DC-DC converters, preserving SNR in receiver paths. |
| Output Noise | 10 µVRMS (10 Hz–100 kHz) - meets stringent phase-noise requirements for local oscillators and PLL VCO supplies. |
| Quiescent Current | 18 µA typ. - extends battery life in always-on RF monitoring circuits and low-duty-cycle IoT sensors. |
| Enable Threshold | VENH = 1.2 V, VENL = 0.4 V - compatible with standard GPIO logic levels and allows clean sequencing with host processors. |
Pinout & Package
Package: WLCSP4 (0.64 mm × 0.64 mm × 0.33 mm, Case 567JZ), Pb-free, RoHS-compliant. Exposed pad tied to GND for thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | IN | Input voltage supply (1.9 V–5.5 V); requires 1 µF ceramic capacitor placed adjacent to minimize trace inductance. |
| A2 | OUT | Regulated 2.85 V output; must be bypassed with 1 µF X7R/X5R ceramic capacitor for stability and transient response. |
| B1 | EN | Active-high enable; <0.4 V disables regulator and activates 280 Ω active discharge path to GND (Version A only). |
| B2 | GND | Common ground reference; connected to exposed pad for optimal thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise | 10 µVRMS (10 Hz–100 kHz) - preserves dynamic range in RF receivers and audio codecs without requiring additional filtering. |
| High PSRR | 98 dB at 1 kHz - rejects ripple from noisy system supplies, reducing need for cascaded regulators in multi-rail designs. |
| Active output discharge | 280 Ω pull-down when disabled - prevents floating output during power sequencing, avoiding latch-up in downstream logic. |
| Stable with 1 µF ceramics | No ESR requirement on COUT - simplifies BOM and layout by eliminating need for specialized tantalum or polymer capacitors. |
| Thermal protection | 160°C shutdown / 140°C reset - prevents permanent damage during sustained overload or poor PCB thermal design. |
Applications
| Smartphone RF Front-End | Wi-Fi 6/6E Transceiver Supply |
|---|---|
Use Scenario: Powers 2.85 V LNA and PA bias rails in LTE/5G handset modules where supply noise directly impacts ACPR and EVM. IC Role / Device Role / Timing Role: Primary low-noise post-regulator for RF signal chain, replacing noisier switching converters. Use Value: 10 µVRMS noise and 98 dB PSRR prevent degradation of receive sensitivity and transmit spectral purity. |
Use Scenario: Supplies 2.85 V VDDIO rail for dual-band Wi-Fi 6E transceivers operating in 2.4 GHz/5 GHz/6 GHz bands. IC Role / Device Role / Timing Role: Clean auxiliary supply for I/O and analog blocks, synchronized with main SoC power sequencing via EN pin. Use Value: Active discharge ensures fast, controlled ramp-down of VDDIO during sleep mode entry, preventing data corruption. |
| Industrial Wireless Sensor Node | Medical Portable Ultrasound Analog Front-End |
Use Scenario: Powers sub-GHz RF SoC (e.g., CC13xx) in battery-operated condition monitoring nodes with 10+ year lifetime targets. IC Role / Device Role / Timing Role: Always-on LDO for MCU and radio core, enabled only during transmission bursts to minimize quiescent loss. Use Value: 18 µA quiescent current and 0.1 µA shutdown current extend shelf life and operational runtime between battery replacements. |
Use Scenario: Supplies 2.85 V bias to ultra-low-noise op-amps and 16-bit SAR ADC drivers in handheld ultrasound probe analog chains. IC Role / Device Role / Timing Role: Precision analog supply isolated from digital switching noise, with tight ±2% output tolerance. Use Value: ±2% accuracy and 0.001 %/mA load regulation maintain consistent gain calibration across temperature and battery voltage drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B285MR-G | 250 mA max output, 220 mV dropout at 250 mA, no active discharge, 25 µVRMS noise | Limited to lower-current analog sensors; lacks active discharge for strict sequencing control | Select when cost-sensitive, low-current (<200 mA), and sequencing simplicity outweighs noise/PSRR requirements |
| Richtek RT9080-285PQW | 500 mA max output, 200 mV dropout at 500 mA, 12 µVRMS noise, no active discharge | Higher current headroom but higher noise and no discharge path - unsuitable for fast-sleep systems | Select when higher output current is needed and active discharge is not required for system-level power management |
Compared with XC6210B285MR-G and RT9080-285PQW, the NCP161AFCT285T2G uniquely combines 450 mA capability, 10 µVRMS noise, 98 dB PSRR, and active discharge in a 0.64 mm × 0.64 mm WLCSP - making it the only option meeting simultaneous RF noise, sequencing, and size constraints in modern portable designs.
Availability
NCP161AFCT285T2G is available at Aetrix Electronics and suitable for smartphone RF front-end, Wi-Fi 6E transceiver, and portable medical ultrasound applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.
Supply support for NCP161AFCT285T2G 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCP161 series is engineered specifically for ultra-low-noise, high-PSRR power delivery to RF and precision analog circuits - prioritizing noise floor, transient response, and small-footprint integration in battery-powered wireless systems.
FAQ
What is the maximum input voltage rating for the NCP161AFCT285T2G?
The NCP161AFCT285T2G has an absolute maximum input voltage rating of 6 V. Operation above 5.5 V is not recommended per datasheet specifications, and sustained exposure beyond 6 V may cause permanent damage. For reliable 2.85 V output, the recommended input range is 1.9 V to 5.5 V, ensuring adequate headroom across all load and temperature conditions.
Does the NCP161AFCT285T2G include active output discharge functionality?
Yes, the NCP161AFCT285T2G (Version A) includes active output discharge: when the EN pin is pulled below 0.4 V, an internal 280 Ω resistor connects OUT to GND, rapidly discharging the output capacitor. This feature is confirmed in the datasheet's "Enable Operation" section and distinguishes it from non-A variants like NCP161BFCT285T2G.
What ceramic capacitor dielectric is recommended for the NCP161AFCT285T2G output?
The NCP161AFCT285T2G datasheet explicitly recommends X7R or X5R dielectric for the 1 µF output capacitor due to their stable capacitance over temperature and DC bias. These dielectrics maintain effective capacitance under load, ensuring stability and optimal transient response - unlike Y5V or Z5U, which exhibit excessive drift.
Can the NCP161AFCT285T2G operate with only a 0.7 µF output capacitor?
Yes, the NCP161AFCT285T2G 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 to guarantee best dynamic performance and margin across all conditions.
What is the thermal shutdown threshold of the NCP161AFCT285T2G?
The NCP161AFCT285T2G triggers thermal shutdown at a typical junction temperature of 160°C, with hysteresis ensuring reset occurs at approximately 140°C. This behavior is verified in the Electrical Characteristics table and Typical Characteristics Figure 49, providing robust protection against sustained overload or inadequate PCB copper area.
NCP161AFCT285T2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 4-XFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.29V @ 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)
NCP161AFCT285T2G FAQ
1.How can I place an order for NCP161AFCT285T2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP161AFCT285T2G 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 NCP161AFCT285T2G reliable?
The price and inventory of NCP161AFCT285T2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP161AFCT285T2G is usually 5 days.
3.What payment methods are accepted for NCP161AFCT285T2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP161AFCT285T2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP161AFCT285T2G?
NCP161AFCT285T2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP161AFCT285T2G 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 NCP161AFCT285T2G?
For technical support, including NCP161AFCT285T2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP161AFCT285T2G requirements.
6.How does Aetrix verify that NCP161AFCT285T2G is sourced from the original manufacturer or authorized distributors?
All NCP161AFCT285T2G 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 NCP161AFCT285T2G meets industry standards.
7.What is the process for return or replacement of NCP161AFCT285T2G?
All NCP161AFCT285T2G units undergo pre-shipment inspection (PSI). If there is an issue with NCP161AFCT285T2G, 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 NCP161AFCT285T2G part is unused and in its original packaging.
Return procedure for NCP161AFCT285T2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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