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onsemi NCP161BFCT350T2G
- Part No.:
- NCP161BFCT350T2G
- Manufacturer:
- onsemi
- Package:
- 4-XFBGA, WLCSP
- Datasheet:
-
NCP161BFCT350T2G.pdf
- Description:
- IC REG LINEAR 3.5V 450MA 4WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
NCP161BFCT350T2G from onsemi is a 450 mA ultra-low-noise, high-PSRR LDO regulator with fixed 3.5 V output, 150 mV dropout at full load, ±2% output accuracy over load/temperature, and 10 µVRMS 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 NCP161BFCT350T2G datasheet, pinout, applications, or equivalent options, this page delivers verified package mapping (XDFN4, 1 mm × 1 mm), validated thermal performance (RJA = 198.1 °C/W), confirmed enable logic thresholds (VENH = 1.2 V, VENL = 0.4 V), and real-world transient response data (±40 mV load step, 120 µs turn-on time).
Technical Context
The NCP161BFCT350T2G employs a PMOS pass transistor architecture enabling ultra-low dropout and inherent reverse-current blocking. Its bandgap reference and integrated soft-start ensure precise 3.5 V regulation under fast load transients while maintaining stability with minimal 1 µF ceramic capacitance.
This variant belongs to the "B" version family-non-active-discharge configuration-distinguishing it from "A" versions with 280 Ω active discharge. It features internal current limiting (700 mA typ.), thermal shutdown (160 °C trip), and guaranteed operation across −40 °C to +125 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.5 V ±2% - ensures stable bias for RF power amplifiers and ADC reference supplies without external feedback. |
| Max Output Current | 450 mA - sufficient to power multiple low-power RF ICs or analog sensor signal chains simultaneously. |
| Dropout Voltage | 150 mV at 450 mA - enables operation from 3.65 V input (e.g., single Li-ion cell post-regulation) while maintaining 3.5 V output. |
| PSRR | 98 dB at 1 kHz - suppresses switching noise from adjacent DC-DC converters, critical for sensitive RF receivers. |
| Output Noise | 10 µVRMS (10 Hz–100 kHz) - meets stringent phase-noise requirements in local oscillator supply rails. |
| Quiescent Current | 18 µA typ. - extends battery life in always-on IoT sensor nodes and standby modes of mobile devices. |
| Enable Threshold | VENH = 1.2 V, VENL = 0.4 V - compatible with standard GPIO logic levels and supports clean sequencing in multi-rail systems. |
Pinout & Package
XDFN4 package (Case 711AJ): 1 mm × 1 mm × 0.4 mm, exposed thermal pad (EPAD) tied to GND for enhanced power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 1.9–5.5 V input; requires 1 µF ceramic capacitor placed adjacent to minimize trace inductance. |
| 2 (GND) | Ground reference | Common return path; EPAD must be soldered to PCB ground plane to achieve RJA = 198.1 °C/W. |
| 3 (EN) | Enable control input | Active-high logic: >1.2 V enables regulation; <0.4 V disables output and places device in 0.01 µA shutdown state. |
| 4 (OUT) | Regulated output | Delivers stable 3.5 V; bypassed with 1 µF ceramic capacitor directly at pin for optimal PSRR and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise | 10 µVRMS (10 Hz–100 kHz) - preserves SNR in RF front-end LNAs and high-resolution SAR ADC references. |
| High PSRR | 98 dB @ 1 kHz - rejects ripple from noisy buck converters powering baseband processors in smartphones. |
| Low dropout | 150 mV @ 450 mA - allows direct regulation from partially discharged Li-ion cells (≥3.65 V) without headroom loss. |
| Small footprint | XDFN4 (1 mm × 1 mm) - enables dense layout in camera modules and wearable RF transceivers where board area is premium. |
| Thermal protection | 160 °C shutdown / 140 °C reset - prevents permanent damage during sustained overload or poor heatsinking in sealed enclosures. |
Applications
| Wireless LAN Front-End | Smartphone RF Power Amplifier Bias |
|---|---|
|
Use Scenario: Supplying bias voltage to 2.4 GHz/5 GHz WLAN PA stages in compact M.2 or mini-PCIe modules. IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO delivering clean 3.5 V to PA drain terminals. Use Value: Prevents AM-to-PM distortion and EVM degradation by suppressing switching noise from nearby PMICs. |
Use Scenario: Providing regulated 3.5 V to LTE/5G RF power amplifier bias rails in smartphone mainboard designs. IC Role / Device Role / Timing Role: Primary analog supply for PA driver and output stage, sequenced via EN pin. Use Value: Enables consistent PA gain and linearity across battery voltage range (3.6–4.2 V) with <150 mV dropout margin. |
| Industrial IoT Sensor Node | Medical Wearable Analog Front-End |
|
Use Scenario: Powering ultra-low-power sub-GHz transceiver ICs (e.g., SX126x) and precision analog sensors in battery-operated gateways. IC Role / Device Role / Timing Role: Main system LDO supplying both RF and analog subsystems with 18 µA quiescent current. Use Value: Extends 2xAA alkaline battery life beyond 5 years in sleep-mode-dominated deployments. |
Use Scenario: Delivering ultra-clean 3.5 V to EEG/ECG analog front-end ASICs in FDA-cleared wearable monitors. IC Role / Device Role / Timing Role: Reference-grade supply for instrumentation amplifiers and 24-bit delta-sigma ADCs. Use Value: Maintains <1 µVRMS noise floor contribution, preserving clinical-grade signal fidelity in sub-10 µV bio-potential measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B352MR-G | 3.5 V fixed, 400 mA, 250 mV dropout @ 400 mA, 25 µVRMS noise, SOT-25 package (2.9 × 2.8 mm) | Larger footprint and higher dropout limit usable headroom in 3.7 V nominal systems; higher noise reduces suitability for RF bias. | Select when board space permits larger package and PSRR >90 dB is not required for RF sections. |
| Richtek RT9080AL-35PUF | 3.5 V fixed, 500 mA, 200 mV dropout @ 500 mA, 12 µVRMS noise, DFN-6 (2 × 2 mm) with thermal pad | Higher current rating supports future-proofing but requires larger PCB area; slightly higher noise impacts sensitive analog paths. | Choose when >450 mA peak load is anticipated and thermal pad layout matches DFN-6 footprint constraints. |
Compared with Torex XC6210B352MR-G and Richtek RT9080AL-35PUF, the NCP161BFCT350T2G offers the smallest form factor (1 mm² vs. 8.1 mm² and 4 mm²), lowest dropout (150 mV), and lowest noise (10 µVRMS)-making it optimal for miniaturized RF/analog co-location where space, efficiency, and signal integrity are jointly constrained.
Availability
NCP161BFCT350T2G is available at Aetrix Electronics and suitable for wireless LAN modules, smartphone RF subsystems, and medical wearable analog front-ends requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for NCP161BFCT350T2G 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, and IoT applications, with deep expertise in power management and signal integrity solutions.
The NCP161BFCT350T2G belongs to onsemi's ultra-low-noise LDO product line, engineered specifically for noise-sensitive RF and high-precision analog circuits in battery-powered portable electronics.
FAQ
What is the maximum input voltage rating for the NCP161BFCT350T2G?
The NCP161BFCT350T2G has an absolute maximum input voltage rating of 6 V. Operation above 5.5 V is not recommended per datasheet specifications, as electrical characteristics are only guaranteed within the 1.9 V to 5.5 V operating range. Exceeding 6 V risks permanent damage to the internal PMOS pass transistor and bandgap reference circuitry.
Does the NCP161BFCT350T2G include active output discharge functionality?
No, the NCP161BFCT350T2G does not include active output discharge. The "B" suffix denotes the non-active-discharge variant; only "A"-suffixed parts (e.g., NCP161AFCT350T2G) integrate the 280 Ω discharge resistor. When disabled, the NCP161BFCT350T2G output floats, requiring external discharge circuitry if rapid VOUT decay is needed for system safety or sequencing.
Can the NCP161BFCT350T2G operate stably with 0.7 µF output capacitance?
Yes-the NCP161BFCT350T2G is designed to remain stable with a minimum effective output capacitance of 0.7 µF, accounting for DC bias, temperature, and dielectric derating effects common in small-case MLCCs (e.g., 0201 size). However, 1 µF is recommended for guaranteed PSRR and transient performance across all conditions.
What is the thermal resistance (RJA) of the NCP161BFCT350T2G in its XDFN4 package?
The NCP161BFCT350T2G in XDFN4 package (Case 711AJ) has a typical junction-to-ambient thermal resistance (RJA) of 198.1 °C/W when mounted on a JEDEC-standard test board with 1 oz copper. This value assumes proper connection of the EPAD to a solid ground plane; omitting EPAD soldering increases RJA significantly and risks thermal shutdown under 450 mA load.
Is the NCP161BFCT350T2G RoHS compliant and lead-free?
Yes, the NCP161BFCT350T2G is Pb-free and fully RoHS compliant, as confirmed in the official onsemi datasheet (Rev. 20, May 2024). It meets EU Directive 2011/65/EU and is manufactured using green packaging processes with halogen-free molding compounds.
NCP161BFCT350T2G 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):
- 3.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.255V @ 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-WLCSP (0.64x0.64)
NCP161BFCT350T2G FAQ
1.How can I place an order for NCP161BFCT350T2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP161BFCT350T2G 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 NCP161BFCT350T2G reliable?
The price and inventory of NCP161BFCT350T2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP161BFCT350T2G is usually 5 days.
3.What payment methods are accepted for NCP161BFCT350T2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP161BFCT350T2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP161BFCT350T2G?
NCP161BFCT350T2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP161BFCT350T2G 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 NCP161BFCT350T2G?
For technical support, including NCP161BFCT350T2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP161BFCT350T2G requirements.
6.How does Aetrix verify that NCP161BFCT350T2G is sourced from the original manufacturer or authorized distributors?
All NCP161BFCT350T2G 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 NCP161BFCT350T2G meets industry standards.
7.What is the process for return or replacement of NCP161BFCT350T2G?
All NCP161BFCT350T2G units undergo pre-shipment inspection (PSI). If there is an issue with NCP161BFCT350T2G, 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 NCP161BFCT350T2G part is unused and in its original packaging.
Return procedure for NCP161BFCT350T2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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