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onsemi NCP4671DSN12T1G
- Part No.:
- NCP4671DSN12T1G
- Manufacturer:
- onsemi
- Package:
- SC-74A, SOT-753
- Datasheet:
-
NCP4671DSN12T1G.pdf
- Description:
- IC REG LINEAR 1.2V 400MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,235
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Product details
Overview
NCP4671DSN12T1G from onsemi is a 400 mA dual-rail ultra-low dropout linear regulator with fixed 1.2 V output, ±15 mV accuracy at 25°C, 180 mV typical dropout at 400 mA, and bias-input architecture enabling operation down to 0.9 V input. It delivers stable low-voltage power for core logic in portable battery-powered systems.
For engineers reviewing the NCP4671DSN12T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its dual-rail bias/power separation, auto-discharge capability, SOT-23-5 package footprint, and guaranteed 1.2 V output stability under 400 mA load across −40°C to +85°C.
Technical Context
The NCP4671DSN12T1G implements a CMOS-based dual-rail LDO architecture: VIN supplies the pass element while VBIAS (2.4–5.25 V) powers the control circuitry, decoupling regulation stability from input rail noise. This enables ultra-low dropout and high PSRR-80 dB at 1 kHz for VIN ripple and 50 dB for VBIAS ripple.
It integrates chip enable (CE) with internal pull-down, supports fast load transients via optimized capacitor requirements (1 µF CIN, 2.2 µF COUT), and includes current foldback protection (120 mA short-circuit limit) and output discharge in the D-version variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.2 V ±15 mV at 25°C; ±20 mV over −40°C to +85°C - ensures precise core voltage for 1.2 V logic domains. |
| Max Output Current | 400 mA continuous - sufficient for powering microcontroller cores, FPGA I/O banks, or ASIC subsystems. |
| Dropout Voltage | 180 mV typical at 400 mA - allows regulation from as low as 1.38 V input, extending battery runtime in single-cell Li-ion or Li-poly systems. |
| Quiescent Current | 28 µA typical - minimizes standby power loss in always-on subsystems like real-time clocks or sensor interfaces. |
| PSRR | 80 dB at 1 kHz (VIN ripple), 50 dB at 1 kHz (VBIAS ripple) - suppresses switching noise from upstream DC/DC converters. |
| Enable Threshold | VCEH = 0.8 V min, VCEL = 0.3 V max - compatible with 1.2 V, 1.8 V, and 3.3 V logic-level control signals. |
| Thermal Resistance | RJA = 238 °C/W (SOT-23) - requires minimal PCB copper area for thermal management at full load in ambient ≤60°C. |
Pinout & Package
Package: SOT-23-5 (Case 1212), Pb-free, 2.7 mm × 3.1 mm × 1.3 mm body height, 0.95 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Main power input to pass transistor | Accepts regulated DC input from 1.3 V to VBIAS; must be ≥ VOUT + 0.1 V (i.e., ≥1.3 V for 1.2 V output). |
| 2 - GND | Analog and power ground reference | Common return path for VIN, VOUT, VBIAS, and CE; requires low-impedance PCB connection to minimize noise coupling. |
| 3 - CE | Active-high chip enable | Pulled internally to GND; tie to VBIAS for always-on operation or drive with logic signal for controlled power sequencing. |
| 4 - VBIAS | Bias supply for control circuitry | Must be 2.4–5.25 V; for 1.2 V output, minimum VBIAS = 1.2 V + 1.6 V = 2.8 V - isolates control loop from VIN noise. |
| 5 - VOUT | Regulated output terminal | Delivers 1.2 V ±15 mV; includes integrated discharge FET (D-version) to rapidly deplete output capacitance during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail architecture | Separates VBIAS (control) and VIN (power path) to achieve <180 mV dropout and maintain PSRR >80 dB despite low input voltage. |
| Auto-discharge function | Integrated N-channel FET between VOUT and GND discharges output capacitor within milliseconds upon CE deactivation - prevents floating voltage in power-sequenced systems. |
| Ultra-low quiescent current | 28 µA typical enables >1-year battery life in coin-cell–powered devices operating intermittently at µA average current. |
| High-accuracy output | ±15 mV initial tolerance at 25°C and ±20 mV over temperature ensures reliable operation of 1.2 V core rails without external trimming. |
| Robust transient response | Stable with 1 µF CIN and 2.2 µF COUT ceramic capacitors; load step recovery time <100 µs (1 mA → 400 mA) preserves system stability during burst-mode processing. |
Applications
| Mobile Phone Baseband Processor Power | Wearable Sensor Hub Supply |
|---|---|
Use Scenario: Powers the 1.2 V core rail of an application processor in a smartphone, supplied by a buck converter's output. IC Role / Device Role / Timing Role: Ultra-low dropout LDO delivering clean, tightly regulated voltage to CPU core logic with minimal headroom from intermediate bus. Use Value: Enables use of lower intermediate bus voltages (e.g., 1.38 V), reducing conduction losses and extending battery life by up to 8% versus higher-dropout alternatives. | Use Scenario: Supplies 1.2 V to an ARM Cortex-M0+ MCU and integrated inertial measurement unit (IMU) in a fitness tracker. IC Role / Device Role / Timing Role: Primary power regulator with auto-discharge, ensuring rapid power-down and zero residual voltage during sleep mode. Use Value: Reduces system wake-up latency by eliminating slow passive discharge through pull-up resistors; cuts standby current to <0.1 µA when disabled. |
| Digital Camera Image Signal Processor (ISP) | Bluetooth Low Energy (BLE) SoC Core Rail |
Use Scenario: Provides 1.2 V to an ISP ASIC during image capture bursts, where load current swings from 10 mA to 400 mA. IC Role / Device Role / Timing Role: High-PSRR LDO rejecting switching noise from adjacent DC/DC converters feeding other camera subsystems. Use Value: Maintains <0.1% output ripple under dynamic load, preventing image artifacts such as banding or noise in raw sensor data. | Use Scenario: Regulates 1.2 V core voltage for a BLE radio SoC during advertising intervals and connected state transitions. IC Role / Device Role / Timing Role: Low-IQ LDO with fast enable/disable timing supporting sub-100 µs wake-up from deep sleep. Use Value: Achieves <2 µA average system current in connected-sleep mode, meeting Bluetooth SIG v5.0 power certification requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low dropout LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B122MR-G | Single-rail architecture; 1.2 V fixed output; 200 mV dropout at 400 mA; no VBIAS pin; 25 µA IQ. | Lacks bias-rail isolation - PSRR drops to 60 dB at 1 kHz; no auto-discharge; smaller XDFN package. | Select when board space is constrained and upstream noise is low; avoid in noisy multi-rail systems requiring >75 dB PSRR. |
| Diodes AP7361-12SG-7 | Single-rail LDO; 1.2 V output; 250 mV dropout at 400 mA; 45 µA IQ; includes enable but no discharge FET. | Higher dropout limits minimum input to 1.45 V; no output discharge; PSRR = 70 dB at 1 kHz. | Choose for cost-sensitive designs where 1.45 V minimum input is acceptable and fast shutdown is not required. |
Compared with XC6210B122MR-G and AP7361-12SG-7, the NCP4671DSN12T1G uniquely combines dual-rail noise isolation, 180 mV dropout, and integrated auto-discharge - making it optimal for noise-sensitive, battery-constrained, and fast-sequencing applications where VBIAS can be sourced from a stable auxiliary rail.
Availability
NCP4671DSN12T1G is available at Aetrix Electronics and suitable for mobile phone baseband processors, wearable sensor hubs, digital camera ISPs, and BLE SoC core rails requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for NCP4671DSN12T1G 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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and consumer markets.
The NCP4671DSN12T1G belongs to onsemi's precision analog LDO portfolio, engineered specifically for ultra-low-voltage, ultra-low-noise power delivery in portable and battery-operated systems demanding high accuracy and minimal dropout.
FAQ
What is the minimum input voltage required for the NCP4671DSN12T1G to regulate 1.2 V output?
The NCP4671DSN12T1G requires VIN ≥ VOUT + 0.1 V = 1.3 V when VOUT ≥ 0.8 V. Its ultra-low dropout of 180 mV typical at 400 mA means it maintains regulation down to 1.38 V input under full load. Below that, output voltage drops linearly with input.
Does the NCP4671DSN12T1G require external components to operate stably?
Yes - the NCP4671DSN12T1G requires three external ceramic capacitors: 1 µF on VIN, 1 µF on VBIAS, and ≥2.2 µF on VOUT. These are mandatory for stability, transient response, and PSRR performance per the datasheet. Tantalum capacitors are not recommended due to ESR-related oscillation risk.
How does the VBIAS pin function in the NCP4671DSN12T1G, and what voltage range is acceptable?
The VBIAS pin powers the internal control circuitry independently of VIN. For the NCP4671DSN12T1G (1.2 V output), VBIAS must be ≥ VOUT + 1.6 V = 2.8 V and ≤ 5.25 V. It may be derived from a separate low-noise rail or upstream converter input to isolate regulation from VIN ripple.
What is the purpose of the auto-discharge feature in the NCP4671DSN12T1G?
The auto-discharge feature uses an internal N-channel FET to actively pull VOUT to GND when CE is low. This rapidly depletes output capacitance - critical for power-sequenced systems where residual voltage on downstream rails could cause latch-up or undefined logic states during reset.
Can the NCP4671DSN12T1G be used without connecting the CE pin?
Yes - the CE pin has an internal pull-down current source (1 µA typical). Leaving it unconnected defaults the device to enabled. For guaranteed operation, tie CE to VBIAS; for controlled enable/disable, drive it with a logic signal referenced to VBIAS or GND.
NCP4671DSN12T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.25V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.28V @ 400mA
- Current - Output:
- 400mA
- Current - Quiescent (Iq):
- 40 µA
- Current - Supply (Max):
- -
- PSRR:
- 80dB ~ 50dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
NCP4671DSN12T1G FAQ
1.How can I place an order for NCP4671DSN12T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP4671DSN12T1G 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 NCP4671DSN12T1G reliable?
The price and inventory of NCP4671DSN12T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4671DSN12T1G is usually 5 days.
3.What payment methods are accepted for NCP4671DSN12T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP4671DSN12T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP4671DSN12T1G?
NCP4671DSN12T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP4671DSN12T1G 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 NCP4671DSN12T1G?
For technical support, including NCP4671DSN12T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4671DSN12T1G requirements.
6.How does Aetrix verify that NCP4671DSN12T1G is sourced from the original manufacturer or authorized distributors?
All NCP4671DSN12T1G 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 NCP4671DSN12T1G meets industry standards.
7.What is the process for return or replacement of NCP4671DSN12T1G?
All NCP4671DSN12T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP4671DSN12T1G, 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 NCP4671DSN12T1G part is unused and in its original packaging.
Return procedure for NCP4671DSN12T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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