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onsemi NCP161BMX350TBG
- Part No.:
- NCP161BMX350TBG
- Manufacturer:
- onsemi
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
NCP161BMX350TBG.pdf
- Description:
- IC REG LINEAR 3.5V 450MA 4XDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,813
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Product details
Overview
NCP161BMX350TBG from onsemi is a 3.5 V fixed-output, 450 mA ultra-low-noise LDO regulator optimized for RF and analog circuits. It delivers ±2% output accuracy over load/temperature, 150 mV dropout at full load, 10 µVRMS output noise (10 Hz–100 kHz), and 98 dB PSRR at 1 kHz - enabling clean power delivery in smartphone baseband, Wi-Fi front-end, and camera sensor rails.
For engineers reviewing the NCP161BMX350TBG datasheet, pinout, applications, or equivalent options, this page provides 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).
Technical Context
The NCP161BMX350TBG uses a PMOS pass transistor architecture with integrated soft-start and bandgap reference, delivering stable regulation without external compensation. Its non-active-discharge variant (denoted by "B" prefix) disables the internal 280 Ω discharge path when disabled, reducing system-level leakage during sleep modes.
It operates across 1.9 V to 5.5 V input voltage and maintains ultra-low quiescent current (18 µA typ.) while supporting ceramic capacitors as small as 1 µF on both input and output - critical for space-constrained mobile PCB layouts where XDFN4 footprint (1 mm × 1 mm) and 0.4 mm height are essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.5 V ±2% - eliminates need for external feedback resistors; supports direct connection to 3.3 V–3.6 V analog/RF ICs requiring tight tolerance. |
| Max Output Current | 450 mA - sufficient for powering dual-band Wi-Fi transceivers or high-resolution image sensors without thermal derating in XDFN4 package. |
| Dropout Voltage | 150 mV at 450 mA - enables operation from 3.65 V input (e.g., single-cell Li-ion at end-of-discharge) while maintaining regulated 3.5 V output. |
| PSRR | 98 dB at 1 kHz - suppresses switching noise from adjacent DC-DC converters, preserving SNR in RF receivers and ADC reference supplies. |
| Output Noise | 10 µVRMS (10 Hz–100 kHz) - meets stringent phase-noise requirements for local oscillators and low-jitter clock buffers. |
| Quiescent Current | 18 µA typ. - extends battery life in always-on sensor nodes and standby-mode cellular modems. |
| Enable Threshold | VENH = 1.2 V, VENL = 0.4 V - compatible with standard GPIOs and I²C-compatible level-shifted control signals. |
Pinout & Package
XDFN4 package (Case 711AJ), 1 mm × 1 mm × 0.4 mm, exposed pad (EPAD) tied to GND for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 1.9–5.5 V; requires 1 µF ceramic capacitor placed within 2 mm for stability and transient immunity. |
| 2 (GND) | Ground reference | Common return path; EPAD must be soldered to solid 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 ultra-low-IQ state (10 nA typ.). |
| 4 (OUT) | Regulated output | Delivers 3.5 V ±2%; bypassed with 1 µF X7R/X5R ceramic capacitor directly at pin for optimal PSRR and load transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise | 10 µVRMS output noise enables use in RF synthesizer VCO supplies without degrading phase noise floor. |
| High PSRR | 98 dB @ 1 kHz ensures rejection of ripple from buck converters feeding shared input rails in multi-rail SoC platforms. |
| Low dropout | 150 mV dropout at 450 mA allows operation from partially discharged batteries or tightly regulated intermediate rails. |
| Small-footprint packaging | XDFN4 (1 mm × 1 mm) reduces PCB area by >70% vs. SOT23-5, critical for camera modules and wearable antenna arrays. |
| Thermal protection | 160 °C shutdown with 140 °C hysteresis prevents latch-up during sustained overload or poor heatsinking in sealed enclosures. |
Applications
| Smartphone Baseband Power | Wi-Fi 6 Front-End Supply |
|---|---|
|
Use Scenario: Powering LTE/5G baseband processors requiring low-noise, fast-transient 3.5 V supply during burst transmission. IC Role / Device Role / Timing Role: Primary LDO for analog section of baseband IC; regulates voltage between buck converter and sensitive RF interface blocks. Use Value: 10 µVRMS noise and ±40 mV load transient response prevent bit errors and maintain EVM compliance under dynamic traffic loads. |
Use Scenario: Supplying PA bias and RF switch control in dual-band 2.4 GHz/5 GHz Wi-Fi 6 modules. IC Role / Device Role / Timing Role: Low-noise post-regulator for RF power amplifier chain; decouples PA supply from noisy digital domain. Use Value: 98 dB PSRR suppresses digital switching noise from WLAN MAC, preserving ACLR and spectral mask performance. |
| Mobile Camera Sensor Rail | IoT Edge Node Analog Front-End |
|
Use Scenario: Providing clean 3.5 V bias to high-resolution CMOS image sensors in smartphones and action cameras. IC Role / Device Role / Timing Role: Dedicated LDO for sensor analog core and ADC reference; isolated from noisy processor domains. Use Value: ±2% accuracy and 150 mV dropout ensure consistent pixel response across battery voltage range (3.6–4.2 V). |
Use Scenario: Powering precision analog signal chains (op-amps, ADCs, temperature sensors) in battery-operated industrial IoT nodes. IC Role / Device Role / Timing Role: Ultra-low-IQ LDO for always-on sensing subsystem; enabled only during measurement windows. Use Value: 18 µA quiescent current extends 10-year battery life in LoRaWAN sensor nodes with 1-minute wake intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS7A2035PDQNR | 3.5 V fixed, 300 mA, 12 µVRMS noise, 70 dB PSRR @ 1 kHz, DQN (1 mm × 1 mm) package | Lower current rating limits use in high-power RF PAs; better noise but lower PSRR compromises switching noise rejection. | Select when ultra-low noise dominates over PSRR and load current stays ≤300 mA. |
| ROHM BD3508EFJ-ME2 | 3.5 V fixed, 500 mA, 25 µVRMS noise, 75 dB PSRR @ 1 kHz, HTSOP-J8 package (2.9 mm × 2.8 mm) | Higher current headroom but larger footprint and higher noise; lacks active discharge control. | Select when board space permits larger package and 500 mA peak current is required for burst-mode operation. |
Compared with TPS7A2035PDQNR and BD3508EFJ-ME2, the NCP161BMX350TBG uniquely balances 450 mA capability, 10 µVRMS noise, and 98 dB PSRR in a 1 mm × 1 mm XDFN4 package - making it optimal for compact, high-performance RF/analog systems where all three parameters are simultaneously critical.
Availability
NCP161BMX350TBG is available at Aetrix Electronics and suitable for smartphone baseband power, Wi-Fi front-end supply, and mobile camera sensor rail applications requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term lifecycle support.
Supply support for NCP161BMX350TBG 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, delivering silicon solutions for automotive, industrial, cloud, and IoT markets with emphasis on reliability and sustainability.
The NCP161BMX350TBG belongs to onsemi's ultra-low-noise LDO family designed specifically for RF and high-fidelity analog circuits in portable electronics - prioritizing PSRR, noise, and miniaturization over cost or general-purpose use.
FAQ
What is the maximum input voltage for the NCP161BMX350TBG?
The NCP161BMX350TBG supports an absolute maximum input voltage of 6 V, with recommended operating range from 1.9 V to 5.5 V. Exceeding 6 V risks permanent damage per Absolute Maximum Ratings. For reliable operation at 5.5 V input, the 150 mV dropout ensures stable 3.5 V output even under full 450 mA load - critical for systems powered by USB PD or boosted battery rails.
Does the NCP161BMX350TBG include thermal shutdown protection?
Yes, the NCP161BMX350TBG integrates thermal shutdown with a typical trip threshold of 160 °C and hysteresis reset at 140 °C. This protects against catastrophic failure during sustained overload or inadequate PCB copper area. The XDFN4 package's RJA of 198.1 °C/W means ≥200 mm² of 1 oz copper is required to sustain 450 mA at 25 °C ambient - verified in Figure 53 of the datasheet.
Can the NCP161BMX350TBG be used with ceramic capacitors smaller than 1 µF?
No - the NCP161BMX350TBG is characterized and guaranteed stable only with ≥1 µF ceramic output capacitance (X7R/X5R dielectric). Using smaller values risks instability, especially under load transients. The datasheet explicitly states minimum effective capacitance is 0.7 µF to account for DC bias derating, so 1 µF 0201/0402 ceramics are the smallest viable choice - confirmed in Applications Information section on page 14.
What is the significance of the "B" in NCP161BMX350TBG?
The "B" denotes the non-active-discharge variant: unlike "A" versions, the NCP161BMX350TBG does not engage the internal 280 Ω discharge resistor when disabled via EN pin. This reduces system leakage during deep-sleep modes - essential for battery-powered devices where nanoampere-level standby current matters. The "M" indicates XDFN4 package, "X350" specifies 3.5 V output, and "TBG" confirms Pb-free, RoHS-compliant tape-and-reel shipping.
How does the NCP161BMX350TBG compare to the NCP161AMX350TBG?
The NCP161BMX350TBG and NCP161AMX350TBG share identical electrical specs (3.5 V, 450 mA, 10 µVRMS, 98 dB PSRR) and XDFN4 packaging, differing only in enable behavior: "A" includes active output discharge (280 Ω pull-down), while "B" omits it. Choose NCP161BMX350TBG when minimizing standby current is critical; choose "A" when rapid output discharge is needed to prevent back-powering or meet safety-critical reset timing.
NCP161BMX350TBG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 4-XDFN Exposed Pad
- 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):
- 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-XDFN (1x1)
NCP161BMX350TBG FAQ
1.How can I place an order for NCP161BMX350TBG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP161BMX350TBG 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 NCP161BMX350TBG reliable?
The price and inventory of NCP161BMX350TBG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP161BMX350TBG is usually 5 days.
3.What payment methods are accepted for NCP161BMX350TBG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP161BMX350TBG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP161BMX350TBG?
NCP161BMX350TBG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP161BMX350TBG 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 NCP161BMX350TBG?
For technical support, including NCP161BMX350TBG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP161BMX350TBG requirements.
6.How does Aetrix verify that NCP161BMX350TBG is sourced from the original manufacturer or authorized distributors?
All NCP161BMX350TBG 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 NCP161BMX350TBG meets industry standards.
7.What is the process for return or replacement of NCP161BMX350TBG?
All NCP161BMX350TBG units undergo pre-shipment inspection (PSI). If there is an issue with NCP161BMX350TBG, 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 NCP161BMX350TBG part is unused and in its original packaging.
Return procedure for NCP161BMX350TBG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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