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onsemi NCP4671DSN15T1G
- Part No.:
- NCP4671DSN15T1G
- Manufacturer:
- onsemi
- Package:
- -
- Datasheet:
-
NCP4671DSN15T1G.pdf
- Description:
- IC REG LINEAR 1.5V 400MA SOT23-5
- Quantity:
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Inventory:5,862
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Product details
Overview
NCP4671DSN15T1G from onsemi is a 400 mA dual-rail ultra-low dropout linear regulator with fixed 1.5 V output, ±15 mV accuracy at 25°C, 180 mV typical dropout at 400 mA, and bias-input separation 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 NCP4671DSN15T1G datasheet, pinout, applications, or equivalent options, this page provides verified technical context, package mapping, key design trade-offs (e.g., VBIAS ≥ VOUT + 1.6 V), and real-world transient response data for fast-switching load scenarios.
Technical Context
The NCP4671DSN15T1G implements a dual-rail architecture: VIN supplies the pass transistor path while VBIAS powers the control circuitry independently-enabling ultra-low dropout (as low as 130 mV at 400 mA for 1.5 V output) and high PSRR (80 dB at 1 kHz on VIN, 50 dB on VBIAS). This separation allows stable regulation even when VIN approaches VOUT.
It features auto-discharge functionality (D-version), CE pin with 0.8 V logic-high threshold, 0.1 µA standby current, and thermal protection with 150°C max junction temperature. The SOT-23-5 package supports compact layouts with validated thermal resistance of 238°C/W (junction-to-air).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5 V ±15 mV (25°C), ±20 mV (−40°C to +85°C) - enables precise core voltage for 1.5 V I/O or logic rails |
| Max Output Current | 400 mA continuous - sufficient for powering microcontroller cores, FPGA I/O banks, or sensor signal chains |
| Dropout Voltage | 130 mV typ. @ 400 mA (VBIAS = 3.6 V) - allows operation with minimal headroom, e.g., VIN = 1.63 V |
| Quiescent Current | 28 µA typ. - minimizes battery drain in always-on subsystems like RTC or wake-up controllers |
| PSRR | 80 dB @ 1 kHz (VIN ripple), 50 dB @ 1 kHz (VBIAS ripple) - suppresses switching noise from upstream DC/DC converters |
| Standby Current | 0.1 µA typ. - ensures negligible leakage during system sleep modes |
| Thermal Resistance | 238°C/W (RJA, SOT-23) - defines maximum power dissipation limit (~420 mW) under natural convection |
Pinout & Package
SOT-23-5 package (Case 1212), 2.7 mm × 2.5 mm × 1.3 mm body, Pb-free, with exposed thermal pad not connected internally.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Main power input | Supplies pass transistor; must be ≥ VOUT + 0.1 V (i.e., ≥ 1.6 V) when VOUT ≥ 0.8 V |
| 2 (GND) | Analog/digital ground reference | Common return for VIN, VOUT, VBIAS, and CE; requires low-impedance PCB connection |
| 3 (CE) | Chip enable input | Active-high logic control (VCEH = 0.8 V min); internal pull-down enables default-off behavior |
| 4 (VBIAS) | Bias supply input | Powers control circuitry; must be ≥ VOUT + 1.6 V (i.e., ≥ 3.1 V) for 1.5 V output |
| 5 (VOUT) | Regulated output | Delivers fixed 1.5 V; includes auto-discharge transistor (D-version) to rapidly collapse output during disable |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail input architecture | Separates VIN (power path) and VBIAS (control path), enabling sub-1 V operation and improved PSRR isolation |
| Ultra-low dropout | 130 mV typical at 400 mA for 1.5 V output - extends battery runtime in low-VIN applications |
| Auto-discharge function | Integrated N-channel discharge transistor pulls VOUT to GND during CE = low - prevents floating outputs in multi-rail sequencing |
| High PSRR at 1 kHz | 80 dB on VIN, 50 dB on VBIAS - critical for clean power in noise-sensitive analog or RF subsystems |
| Low quiescent current | 28 µA typical - reduces no-load power loss in always-on circuits without compromising regulation speed |
Applications
| Mobile Baseband Processors | Portable Medical Sensors |
|---|---|
|
Use Scenario: Powering ARM Cortex-A series baseband processor I/O rails in smartphones and LTE modems. IC Role / Device Role / Timing Role: Provides tightly regulated 1.5 V supply for memory interfaces and peripheral I/O, synchronized with system enable signals via CE pin. Use Value: Dual-rail architecture rejects ripple from buck converter feeding VBIAS, while 130 mV dropout preserves battery life during deep discharge. |
Use Scenario: Supplying precision analog front-end (AFE) and low-power MCU in handheld ECG or pulse oximeter units. IC Role / Device Role / Timing Role: Delivers low-noise 1.5 V bias for op-amps and ADC references; auto-discharge ensures safe power-down sequencing. Use Value: 70 µVrms output noise and 80 dB PSRR maintain signal integrity in sub-µV biomedical measurements. |
| Wearable Display Drivers | Industrial IoT Edge Nodes |
|
Use Scenario: Powering OLED display column drivers and timing controllers in smartwatches and AR glasses. IC Role / Device Role / Timing Role: Regulates 1.5 V logic supply with fast load transient response (<200 µs recovery) to handle dynamic pixel current demands. Use Value: Load transient plots (Fig. 49–50) confirm <±15 mV deviation at 400 mA step, preventing display flicker or ghosting. |
Use Scenario: Providing auxiliary 1.5 V rail for wireless transceivers (BLE/Zigbee) and sensor hubs in battery-operated gateways. IC Role / Device Role / Timing Role: Acts as post-regulator after primary DC/DC, with CE pin enabling firmware-controlled power gating per subsystem. Use Value: 0.1 µA standby current extends shelf life and operational runtime in duty-cycled edge devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6210B152MR-G | Single-rail, 200 mA, 1.5 V fixed, 250 mV dropout @ 200 mA, no VBIAS pin | Lacks dual-rail architecture and auto-discharge; lower current rating limits use in high-dynamic loads | Select when board space is constrained and VBIAS routing is impractical; verify dropout margin with worst-case VIN |
| Richtek RT9013-15GB | Single-rail, 500 mA, 1.5 V fixed, 220 mV dropout @ 500 mA, 25 µA IQ, no auto-discharge | Higher current capability but no integrated discharge path; PSRR peaks at 60 dB (lower than NCP4671's 80 dB) | Prefer for higher-current applications where external discharge circuitry can be added; avoid in strict sequencing-critical designs |
Compared with XC6210B152MR-G and RT9013-15GB, the NCP4671DSN15T1G uniquely combines dual-rail operation, auto-discharge, and superior PSRR-making it optimal for noise-sensitive, multi-rail portable systems requiring precise sequencing and minimal dropout.
Availability
NCP4671DSN15T1G is available at Aetrix Electronics and suitable for mobile baseband processors, wearable display drivers, and industrial IoT edge nodes requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for NCP4671DSN15T1G 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 manufacturer specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and portable electronics.
The NCP4671DSN15T1G belongs to onsemi's ultra-low dropout LDO family designed specifically for battery-powered applications demanding sub-1 V input operation, tight output accuracy, and fast transient response in space-constrained layouts.
FAQ
What is the minimum required VBIAS voltage for NCP4671DSN15T1G?
The NCP4671DSN15T1G requires VBIAS ≥ VOUT + 1.6 V, so for its fixed 1.5 V output, VBIAS must be at least 3.1 V. Per datasheet Section 3, the valid VBIAS range is 3.1 V to 5.25 V. Operating below 3.1 V risks UVLO activation and regulation failure.
Does NCP4671DSN15T1G support automatic output discharge during shutdown?
Yes, the "D" suffix in NCP4671DSN15T1G denotes the auto-discharge version. When CE is pulled low, an internal N-channel transistor actively discharges the VOUT capacitor to GND, preventing residual voltage that could interfere with system reset or sequencing.
What is the maximum allowable input voltage (VIN) for NCP4671DSN15T1G?
VIN must satisfy VIN ≤ VBIAS per Absolute Maximum Ratings. For example, with VBIAS = 3.6 V, VIN may range from 1.6 V (VOUT + 0.1 V) up to 3.6 V. Exceeding VBIAS violates the safe operating area and may damage the device.
How does the dual-rail architecture improve PSRR in NCP4671DSN15T1G?
The dual-rail architecture isolates the control circuitry (powered by VBIAS) from the power path (VIN), allowing independent PSRR optimization: 80 dB rejection of VIN ripple and 50 dB rejection of VBIAS ripple at 1 kHz. This prevents noise coupling between upstream DC/DC stages and sensitive analog loads.
Can NCP4671DSN15T1G operate with VIN = 1.55 V?
No. For the 1.5 V output, the datasheet specifies VIN ≥ VOUT + 0.1 V = 1.6 V. At 1.55 V, the device enters dropout and cannot maintain regulation. Minimum functional VIN is 1.6 V under all conditions, with recommended margin for temperature and tolerance.
NCP4671DSN15T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- -
- Output Type:
- -
- Number of Regulators:
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- -
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
NCP4671DSN15T1G FAQ
1.How can I place an order for NCP4671DSN15T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP4671DSN15T1G 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 NCP4671DSN15T1G reliable?
The price and inventory of NCP4671DSN15T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4671DSN15T1G is usually 5 days.
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Once your NCP4671DSN15T1G 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 NCP4671DSN15T1G?
For technical support, including NCP4671DSN15T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4671DSN15T1G requirements.
6.How does Aetrix verify that NCP4671DSN15T1G is sourced from the original manufacturer or authorized distributors?
All NCP4671DSN15T1G 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 NCP4671DSN15T1G meets industry standards.
7.What is the process for return or replacement of NCP4671DSN15T1G?
All NCP4671DSN15T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP4671DSN15T1G, 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 NCP4671DSN15T1G part is unused and in its original packaging.
Return procedure for NCP4671DSN15T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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