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onsemi NCP161BFCS285T2G
- Part No.:
- NCP161BFCS285T2G
- Manufacturer:
- onsemi
- Package:
- 4-XFBGA, WLCSP
- Datasheet:
-
NCP161BFCS285T2G.pdf
- Description:
- IC REG LINEAR 2.85V 450MA 4WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,738
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Product details
Overview
NCP161BFCS285T2G 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 circuits in space-constrained mobile devices.
For engineers reviewing the NCP161BFCS285T2G datasheet, pinout, applications, or equivalent options, this page delivers verified package mapping (WLCSP4, 0.64 mm × 0.64 mm), validated thermal performance (RJA = 108 °C/W), EN-controlled active discharge disable, and real-world transient response data for battery-powered RF subsystems.
Technical Context
The NCP161BFCS285T2G uses a PMOS pass transistor architecture enabling low dropout and inherent reverse-current protection. Its bandgap reference and integrated soft-start ensure stable startup with 1 µF ceramic input/output capacitors without ESR requirements.
It features a dedicated EN pin with 1.2 V enable threshold and 0.4 V disable threshold, internal current limiting (700 mA typ.), thermal shutdown (160 °C trip), and no active discharge (Version B variant), distinguishing it from A-series parts with 280 Ω discharge resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.85 V ±2% - eliminates external feedback network; supports precision analog/RF rails requiring tight regulation. |
| Max Output Current | 450 mA - sufficient for powering RF transceivers, ADCs, or low-power SoC cores without thermal derating under typical PCB copper area. |
| Dropout Voltage | 170 mV at 450 mA (typ.) - enables operation from 3.02 V input, critical for single-cell Li-ion systems near end-of-discharge. |
| PSRR | 98 dB at 1 kHz - suppresses switching noise from adjacent DC-DC converters, preserving signal integrity in RF front-ends. |
| Output Noise | 10 µVRMS (10 Hz–100 kHz) - meets stringent phase-noise and SNR requirements of LTE/Wi-Fi receivers and high-resolution audio codecs. |
| Quiescent Current | 18 µA (typ.) - extends battery life in always-on sensor nodes or standby modes of smartphones and wearables. |
| Enable Threshold | VENH = 1.2 V, VENL = 0.4 V - compatible with standard GPIO logic levels; internal 200 nA pull-down ensures default-off safety. |
Pinout & Package
Package: WLCSP4 (Chip Scale Package), 0.64 mm × 0.64 mm × 0.33 mm (Case 567KA), Pb-free, RoHS compliant. Exposed pad tied to GND for thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 1.9–5.5 V; requires 1 µF ceramic capacitor placed adjacent to minimize trace inductance and improve line transient response. |
| OUT | Regulated output | Delivers stable 2.85 V; must be bypassed with 1 µF X7R/X5R ceramic capacitor close to pin to ensure stability and low noise. |
| EN | Enable control input | Logic-high (>1.2 V) enables regulation; logic-low (<0.4 V) disables output and disables active discharge (B-version). |
| GND | Ground reference | Common return path; exposed pad must be soldered to PCB ground plane to achieve RJA = 108 °C/W and prevent thermal shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise | 10 µVRMS output noise enables clean power for RF LNAs and high-SNR audio DACs without additional filtering. |
| High PSRR | 98 dB @ 1 kHz allows co-location with noisy digital ICs while maintaining RF receiver sensitivity. |
| Low dropout | 170 mV @ 450 mA supports efficient operation from aging Li-ion cells down to 3.02 V input. |
| Minimal external components | Stable with only two 1 µF ceramic capacitors - reduces BOM count and PCB footprint in compact mobile designs. |
| Thermal protection | 160 °C junction shutdown with 140 °C hysteresis prevents permanent damage during sustained overload or poor heatsinking. |
Applications
| Smartphone RF Front-End | Wi-Fi 6/6E Transceiver Power |
|---|---|
|
Use Scenario: Powering LTE/5G power amplifier bias circuits and RF switches in multi-band smartphone modules. IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO supplying clean 2.85 V bias rail to preserve EVM and ACLR performance. Use Value: 10 µVRMS noise and 98 dB PSRR directly reduce in-band phase noise and adjacent channel interference. |
Use Scenario: Regulating 2.85 V supply for Wi-Fi 6E transceiver ICs operating in 5.925–7.125 GHz unlicensed spectrum. IC Role / Device Role / Timing Role: Primary analog supply LDO ensuring stable voltage under fast load transients during OFDMA burst transmission. Use Value: 40 mV load transient deviation (1–450 mA) and 170 mV dropout maintain compliance with IEEE 802.11ax voltage tolerance specs. |
| Industrial IoT Sensor Node | Medical Wearable Analog Signal Chain |
|
Use Scenario: Powering ultra-low-power BLE SoCs and MEMS sensors in battery-operated predictive maintenance edge nodes. IC Role / Device Role / Timing Role: Main system LDO delivering regulated 2.85 V with 18 µA quiescent current to extend 10-year battery life. Use Value: Sub-20 µA IQ and 0.1 µA shutdown current enable >8-year shelf life and multi-year field deployment on coin cells. |
Use Scenario: Supplying precision analog front-end (AFE) for ECG/PPG monitoring in FDA-cleared wearable patches. IC Role / Device Role / Timing Role: Dedicated LDO for ADC reference and op-amp biasing, isolated from digital switching noise. Use Value: ±2% output accuracy and 10 µVRMS noise meet IEC 60601-2-47 clinical accuracy requirements for biopotential measurement. |
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 @ 250 mA, 12 µVRMS noise, SOT-25 package (2.9 × 2.8 mm) | Lower current capacity and larger footprint; suitable only for sub-250 mA analog rails. | Select when board space permits larger SOT-25 and load current remains ≤250 mA. |
| Richtek RT9080A-285GB | 500 mA max output, 200 mV dropout @ 500 mA, 25 µVRMS noise, DFN-6 (2 × 2 mm), includes foldback current limit | Higher noise degrades RF SNR; larger package increases layout complexity in ultra-thin mobile designs. | Choose only if higher output current is mandatory and noise sensitivity is secondary to cost. |
Compared with XC6210B285MR-G and RT9080A-285GB, the NCP161BFCS285T2G uniquely balances 450 mA capability, 10 µVRMS noise, and 0.64 mm × 0.64 mm WLCSP4 footprint - making it optimal for next-gen RF modules where size, noise, and current co-constrain design.
Availability
NCP161BFCS285T2G is available at Aetrix Electronics and suitable for smartphone RF front-ends, Wi-Fi 6E transceiver power, and medical wearable analog signal chains requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for NCP161BFCS285T2G 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 was engineered specifically for RF and high-performance analog circuits - prioritizing ultra-low noise, high PSRR, and minimal footprint to enable advanced wireless connectivity and precision signal conditioning.
FAQ
What is the output voltage tolerance of the NCP161BFCS285T2G across temperature and load?
The NCP161BFCS285T2G maintains ±2% output voltage accuracy over −40°C to +125°C junction temperature and 0–450 mA load range. This specification is guaranteed for both WLCSP4 and XDFN4 packages per the datasheet's Electrical Characteristics table, ensuring consistent 2.85 V regulation in thermally demanding environments like smartphone basebands.
Does the NCP161BFCS285T2G include active output discharge?
No, the NCP161BFCS285T2G is a Version B device and does not include active output discharge. Unlike Version A (e.g., NCP161AFCS285T2G), it lacks the 280 Ω internal discharge resistor. When disabled via EN, the output floats rather than being pulled to GND - a key distinction confirmed in the Ordering Information table and Applications Information section.
What is the minimum recommended output capacitor for stable operation of the NCP161BFCS285T2G?
The NCP161BFCS285T2G is stable with a minimum 0.7 µF effective output capacitance, but the datasheet specifies 1 µF X7R or X5R ceramic capacitor as the recommended value. This ensures robust performance across temperature, DC bias, and PCB layout variations - especially critical for 0201/0402 case sizes where capacitance drops significantly under bias.
Can the NCP161BFCS285T2G operate from a 2.5 V input supply?
No - the NCP161BFCS285T2G requires a minimum input voltage of 1.9 V, but its dropout voltage is 170 mV at 450 mA. To deliver regulated 2.85 V output at full load, the input must be ≥3.02 V. At 2.5 V input, the device enters dropout and cannot sustain 2.85 V output, as confirmed by Figure 18 (Dropout vs. Load Current) and Absolute Maximum Ratings.
What thermal resistance does the NCP161BFCS285T2G exhibit in its WLCSP4 package?
The NCP161BFCS285T2G in WLCSP4 (Case 567KA) exhibits a junction-to-ambient thermal resistance (RJA) of 108 °C/W when mounted on a JEDEC-standard test board with 1 oz copper. This value assumes proper connection of the exposed pad to the PCB ground plane - failure to do so degrades thermal performance and risks thermal shutdown under 450 mA load.
NCP161BFCS285T2G 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)
NCP161BFCS285T2G FAQ
1.How can I place an order for NCP161BFCS285T2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP161BFCS285T2G 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 NCP161BFCS285T2G reliable?
The price and inventory of NCP161BFCS285T2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP161BFCS285T2G is usually 5 days.
3.What payment methods are accepted for NCP161BFCS285T2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP161BFCS285T2G transactions.
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4.How is shipping managed for NCP161BFCS285T2G?
NCP161BFCS285T2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP161BFCS285T2G 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 NCP161BFCS285T2G?
For technical support, including NCP161BFCS285T2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP161BFCS285T2G requirements.
6.How does Aetrix verify that NCP161BFCS285T2G is sourced from the original manufacturer or authorized distributors?
All NCP161BFCS285T2G 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 NCP161BFCS285T2G meets industry standards.
7.What is the process for return or replacement of NCP161BFCS285T2G?
All NCP161BFCS285T2G units undergo pre-shipment inspection (PSI). If there is an issue with NCP161BFCS285T2G, 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 NCP161BFCS285T2G part is unused and in its original packaging.
Return procedure for NCP161BFCS285T2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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