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onsemi NCP161AMX185TBG
- Part No.:
- NCP161AMX185TBG
- Manufacturer:
- onsemi
- Package:
- 4-XDFN Exposed Pad
- Datasheet:
-
NCP161AMX185TBG.pdf
- Description:
- IC REG LINEAR 1.85V 450MA 4XDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,728
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Product details
Overview
NCP161AMX185TBG from onsemi is a 450 mA ultra-low-noise, high-PSRR LDO regulator with fixed 1.85 V output, designed for RF and analog circuits in space-constrained portable devices. It delivers ±2% output accuracy over load/temperature, 150 mV dropout at 450 mA, 10 µVRMS output noise (10 Hz–100 kHz), and 98 dB PSRR at 1 kHz - enabling clean power delivery to sensitive receivers and ADCs in smartphones and wireless LAN modules.
For engineers reviewing the NCP161AMX185TBG datasheet, pinout, applications, or equivalent options, key selection criteria include its XDFN4 1 mm × 1 mm package, active discharge capability, 18 µA quiescent current, compatibility with 1 µF ceramic input/output capacitors, and thermal shutdown protection at 160°C.
Technical Context
The NCP161AMX185TBG uses a PMOS pass transistor architecture enabling low dropout and inherent reverse-current blocking. Its bandgap reference and integrated soft-start ensure stable startup under varying load conditions, while the enable logic supports precise system-level power sequencing.
It features active output discharge (280 Ω pull-down) when disabled, internal current limiting (700 mA typ.), and thermal shutdown with hysteresis (160°C trip / 140°C reset). The device operates across −40°C to +125°C junction temperature and is stable with 0.7 µF minimum effective output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.85 V ±2% - ensures precise biasing for 1.8 V–1.85 V core rails in mobile SoCs and RF transceivers. |
| Max Output Current | 450 mA - sufficient to power multiple RF front-end ICs or high-speed analog signal chains without derating. |
| Dropout Voltage | 185 mV at 450 mA - enables operation from 2.035 V input, supporting single-cell Li-ion (2.7–4.2 V) with margin. |
| PSRR | 98 dB at 1 kHz - suppresses switching noise from adjacent DC-DC converters, critical for LTE/Wi-Fi receiver sensitivity. |
| Output Noise | 10 µVRMS (10 Hz–100 kHz) - meets stringent phase-noise requirements for local oscillators and high-resolution ADCs. |
| Quiescent Current | 18 µA typ. - extends battery life in always-on sensor and modem subsystems. |
| 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 thermal pad (EPAD) tied to GND for enhanced thermal performance. Pin pitch: 0.65 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 1.9–5.5 V; 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 for thermal and electrical integrity. |
| 3 (EN) | Enable control input | Active-high logic: >1.2 V enables regulation; <0.4 V disables with active discharge (280 Ω to GND). |
| 4 (OUT) | Regulated output | Delivers 1.85 V ±2%; bypassed with 1 µF ceramic capacitor directly at pin for optimal transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise | 10 µVRMS (10 Hz–100 kHz) - preserves SNR in RF receivers and precision analog front-ends. |
| High PSRR | 98 dB @ 1 kHz - rejects ripple from noisy switchers without additional filtering stages. |
| Low quiescent current | 18 µA typ. - minimizes standby power loss in battery-backed real-time clocks and sensors. |
| Active output discharge | 280 Ω internal pull-down - ensures rapid, controlled VOUT discharge during shutdown, preventing latch-up in downstream logic. |
| Thermal protection | 160°C shutdown with 20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
Applications
| Smartphone RF Front-End | Wi-Fi 6/6E Transceiver Bias |
|---|---|
|
Use Scenario: Powering LNA, mixer, and PA bias rails in multi-band smartphone RF modules. IC Role / Device Role / Timing Role: Low-noise local power source for RF signal chain components requiring stable 1.85 V with minimal phase noise contribution. Use Value: 10 µVRMS noise and 98 dB PSRR prevent degradation of EVM and ACLR in sub-6 GHz bands. |
Use Scenario: Supplying VDD_IO and VDD_PLL rails in dual-band Wi-Fi 6E chipsets. IC Role / Device Role / Timing Role: Clean, sequenced power domain for clock generation and high-speed digital I/O interfaces. Use Value: Active discharge ensures safe power-down sequencing between 2.4 GHz and 5/6 GHz PHY sections. |
| Industrial IoT Sensor Node | Automotive Camera Module |
|
Use Scenario: Regulating power for ultra-low-power SAR ADCs and BLE radio SoCs in battery-operated edge nodes. IC Role / Device Role / Timing Role: Primary LDO for mixed-signal ASICs operating in deep-sleep mode with microamp-level wake-up current budgets. Use Value: 18 µA quiescent current and 0.1 µA shutdown current extend 10-year battery life in sealed deployments. |
Use Scenario: Providing 1.85 V core voltage to image signal processors (ISPs) and high-speed MIPI CSI-2 serializers. IC Role / Device Role / Timing Role: Post-regulator for noise-sensitive imaging pipelines where switching noise causes fixed-pattern noise or color artifacts. Use Value: Stable 1.85 V ±2% output maintains consistent pixel gain calibration across automotive temperature range (−40°C to +105°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B185MR-G | 1.85 V fixed output, 300 mA, 25 µA IQ, no active discharge, SOT-25 package (2.9 × 2.8 mm) | Larger footprint, lower current rating, no discharge function - unsuitable for fast power-down sequencing. | Select when board area allows larger package and active discharge is not required. |
| Richtek RT9080A-185GJ6F | 1.85 V fixed output, 500 mA, 22 µA IQ, 200 mV dropout, WLCSP-4 (0.64 × 0.64 mm) | Higher current, smaller CSP package, but no active discharge and 15 dB lower PSRR at 1 kHz (83 dB). | Select when higher output current is needed and PSRR >95 dB is not mandatory for RF stage. |
Compared with XC6210B185MR-G and RT9080A-185GJ6F, the NCP161AMX185TBG uniquely combines 450 mA drive, 98 dB PSRR, 10 µVRMS noise, and active discharge in a compact 1 mm × 1 mm XDFN4 package - making it optimal for RF-critical, space-constrained, and fast-sequencing applications.
Availability
NCP161AMX185TBG is available at Aetrix Electronics and suitable for smartphone RF modules, Wi-Fi 6E transceivers, and industrial IoT sensor nodes requiring stable component supply, full lifecycle support, and RoHS-compliant packaging.
Supply support for NCP161AMX185TBG 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCP161AMX185TBG belongs to onsemi's high-performance analog LDO family, engineered specifically for noise-sensitive RF and analog signal chains in portable and battery-powered systems.
FAQ
What is the maximum input voltage rating for the NCP161AMX185TBG?
The NCP161AMX185TBG has an absolute maximum input voltage of 6 V. Operation above 5.5 V is outside the recommended operating range and may compromise reliability or parametric performance. For continuous operation, VIN must remain between 1.9 V and 5.5 V per the Electrical Characteristics table.
Does the NCP161AMX185TBG require external compensation components?
No, the NCP161AMX185TBG is internally compensated and stable with a minimum 0.7 µF ceramic output capacitor. It is optimized for 1 µF X7R/X5R MLCCs and does not require external resistors, capacitors, or feedback networks for stability.
Is active output discharge present in the NCP161AMX185TBG?
Yes, the NCP161AMX185TBG includes active output discharge. When the EN pin is pulled below 0.4 V, an internal 280 Ω resistor connects OUT to GND, discharging the output capacitor rapidly - a feature confirmed in the datasheet's "PIN FUNCTION DESCRIPTION" and "APPLICATIONS INFORMATION" sections.
What is the thermal resistance (RJA) of the NCP161AMX185TBG in its XDFN4 package?
The NCP161AMX185TBG in XDFN4 package has a typical junction-to-ambient thermal resistance (RJA) of 198.1°C/W, measured per JEDEC JESD51-7 on a standard test board. Actual RJA improves significantly with increased copper area and 2 oz Cu layers, as shown in Figure 53 of the datasheet.
Can the NCP161AMX185TBG be used with tantalum output capacitors?
No - the datasheet explicitly advises against using tantalum capacitors on the output due to their high and temperature-dependent ESR, which can degrade load transient response and high-frequency PSRR. Only ceramic capacitors (X7R/X5R, ≥1 µF) are recommended for stable operation.
NCP161AMX185TBG 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):
- 1.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- 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 (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-XDFN (1x1)
NCP161AMX185TBG FAQ
1.How can I place an order for NCP161AMX185TBG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP161AMX185TBG 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 NCP161AMX185TBG reliable?
The price and inventory of NCP161AMX185TBG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP161AMX185TBG is usually 5 days.
3.What payment methods are accepted for NCP161AMX185TBG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP161AMX185TBG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP161AMX185TBG?
NCP161AMX185TBG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP161AMX185TBG 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 NCP161AMX185TBG?
For technical support, including NCP161AMX185TBG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP161AMX185TBG requirements.
6.How does Aetrix verify that NCP161AMX185TBG is sourced from the original manufacturer or authorized distributors?
All NCP161AMX185TBG 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 NCP161AMX185TBG meets industry standards.
7.What is the process for return or replacement of NCP161AMX185TBG?
All NCP161AMX185TBG units undergo pre-shipment inspection (PSI). If there is an issue with NCP161AMX185TBG, 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 NCP161AMX185TBG part is unused and in its original packaging.
Return procedure for NCP161AMX185TBG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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