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onsemi NCP4681DMX33TCG
- Part No.:
- NCP4681DMX33TCG
- Manufacturer:
- onsemi
- Package:
- 4-XFDFN Exposed Pad
- Datasheet:
-
NCP4681DMX33TCG.pdf
- Description:
- IC REG LINEAR 3.3V 150MA 4XDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,176
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Product details
Overview
NCP4681DMX33TCG from onsemi is a 150 mA ultra-low-quiescent-current CMOS linear voltage regulator with fixed 3.3 V output, 1 µA typical supply current, and integrated auto-discharge function. It features 0.25 V dropout at 150 mA (VOUT = 3.3 V), ±1.0% output voltage accuracy over temperature, and stable operation with ≥0.1 µF ceramic output capacitors. It is used in battery-powered portable electronics requiring fast shutdown discharge and minimal standby power.
For engineers reviewing the NCP4681DMX33TCG datasheet, pinout, applications, or equivalent options, key selection criteria include its XDFN4 0.8×0.8 mm package, enable-controlled active/standby modes, 1.4–5.25 V input range, and guaranteed 3.3 V output under load transients up to 150 mA.
Technical Context
The NCP4681DMX33TCG implements a CMOS-based LDO architecture with a built-in constant-slope soft-start circuit that prevents output overshoot and limits inrush current. Its internal N-channel pass transistor enables low dropout and supports auto-discharge via an integrated VOUT-to-GND discharge transistor activated during disable.
It operates across −40°C to +85°C ambient, delivers ±100 ppm/°C output voltage temperature coefficient, and maintains stability with ceramic capacitors ≥0.1 µF without external compensation. Line regulation is 0.02%/V typ., and PSRR reaches 25 dB at 1 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1.0% over −40°C to +85°C - ensures reliable logic-level supply for 3.3 V microcontrollers and sensors. |
| Max Output Current | 150 mA continuous - sufficient for powering low-power SoCs, RF modules, and peripheral ICs in portable devices. |
| Quiescent Current | 1 µA typ. (active), 0.1 µA typ. (standby) - extends battery life in always-on or sleep-mode applications. |
| Dropout Voltage | 0.25 V at 150 mA (VOUT = 3.3 V) - enables operation down to 3.55 V input, critical for single-cell Li-ion or multi-cell alkaline systems. |
| Input Voltage Range | 1.40 V to 5.25 V - supports wide-input sources including boosted supplies, USB, and partially discharged batteries. |
| Stability | Guaranteed with ≥0.1 µF ceramic output capacitor - eliminates need for tantalum or electrolytic caps, reducing BOM cost and footprint. |
| Enable Threshold | VCEH = 1.0 V min., VCEL = 0.4 V max. - compatible with 1.8 V and 3.3 V GPIO control without level-shifting. |
Pinout & Package
XDFN4 0.8 × 0.8 mm, 4-pin package with exposed thermal pad (connected to GND). Compact footprint ideal for space-constrained wearables and IoT edge nodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Regulated output | Delivers stable 3.3 V; requires local 0.1 µF ceramic decoupling placed adjacent to pin. |
| 2 - GND | Ground reference | Common return for input/output paths and thermal pad connection point; must be low-impedance. |
| 3 - CE | Chip enable input | Active-high logic control (1.0 V min. high); pulls down 0.3 µA when floating - connect to VIN if unused. |
| 4 - VIN | Unregulated input | Accepts 1.4–5.25 V; requires 0.1 µF ceramic decoupling close to pin to suppress line transients. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge function | Integrated VOUT-to-GND discharge transistor activates on CE deassertion - discharges output cap in <1 ms, preventing residual voltage hold-up in power sequencing. |
| Constant-slope soft-start | Fully internal ramp generator eliminates external components and guarantees monotonic VOUT rise with no overshoot, even into large output capacitance. |
| Fold-back current limit | Reduces output current and voltage during overload - protects IC and source under short-circuit while limiting power dissipation. |
| Pb-free XDFN4 package | 0.8 × 0.8 mm, 0.48 mm pitch, thermally enhanced - enables high-density layouts and meets RoHS/REACH compliance without reflow concerns. |
| Low-noise operation | 100 µVRMS output noise (10 Hz–100 kHz) - suitable for noise-sensitive analog circuits like ADC references and RF bias rails. |
Applications
| Battery-Powered Wearables | IoT Sensor Nodes |
|---|---|
|
Use Scenario: Powering BLE SoC, accelerometer, and flash memory in compact fitness trackers with coin-cell or thin-film batteries. IC Role / Device Role / Timing Role: Primary 3.3 V LDO delivering regulated rail during active sensing and deep-sleep modes. Use Value: 0.1 µA standby current extends battery life beyond 1 year; auto-discharge ensures clean reset between wake cycles. |
Use Scenario: Supplying environmental sensors (temperature/humidity) and LoRaWAN transceivers in remote industrial monitoring nodes. IC Role / Device Role / Timing Role: Low-noise, stable 3.3 V source enabling accurate sensor readings and reliable radio transmission. Use Value: 100 µVRMS noise and ±1.0% accuracy maintain measurement integrity; 0.25 V dropout allows operation until battery drops to 3.55 V. |
| Portable Medical Devices | Smart Home Controllers |
|
Use Scenario: Powering optical heart-rate monitors and ECG front-ends in FDA-cleared handheld diagnostics tools. IC Role / Device Role / Timing Role: Clean, low-drift 3.3 V supply for analog signal chains and precision ADCs. Use Value: ±100 ppm/°C tempco and 0.02%/V line regulation minimize offset drift across operating conditions. |
Use Scenario: Regulating power for Wi-Fi MCU, touch controller, and LED drivers in battery-backed smart thermostats and hubs. IC Role / Device Role / Timing Role: Main system LDO supporting dynamic load changes during wireless communication bursts. Use Value: Fast transient response (Fig. 26–34) and fold-back protection prevent brownouts during 150 mA transmit peaks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP4684EMX33TCG | No CE pin; 0.3 µA lower active IQ (0.7 µA typ.), no auto-discharge | Suitable where enable control and fast discharge are unnecessary - e.g., always-on battery backup rails | Select when minimizing active current is prioritized over controllability and sequencing. |
| MCP1700T-3302E/MB | 250 mA output, 1.6 µA IQ, SOT-23-3 package, no auto-discharge | Larger footprint, higher quiescent current, no discharge path - less suitable for tight sequencing | Choose only if higher output current or legacy SOT-23 compatibility is required; not drop-in. |
Compared with NCP4681DMX33TCG, the NCP4684EMX33TCG offers lower active IQ but forfeits enable control and auto-discharge, while the MCP1700T-3302E/MB provides higher current headroom at the cost of larger size and no discharge capability - making NCP4681DMX33TCG optimal for space- and sequencing-critical portable designs.
Availability
NCP4681DMX33TCG is available at Aetrix Electronics and suitable for battery-powered wearables, IoT sensor nodes, portable medical devices, and smart home controllers requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for NCP4681DMX33TCG 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, with leadership in power management, analog, and sensor technologies.
The NCP4681 series belongs to onsemi's ultra-low-IQ LDO portfolio, designed specifically for extended-battery-life portable and wearable applications demanding sub-µA standby operation and precise voltage regulation.
FAQ
What is the maximum input voltage rating for the NCP4681DMX33TCG?
The absolute maximum input voltage for the NCP4681DMX33TCG is 6.0 V. However, the recommended maximum operating input voltage is 5.25 V per electrical characteristics. Operation above 5.25 V (up to 5.50 V) is permitted only for ≤500 total hours across the device lifetime - this limitation is explicitly defined in the datasheet to ensure reliability.
Does the NCP4681DMX33TCG require an external capacitor on the CE pin?
No, the NCP4681DMX33TCG does not require an external capacitor on the CE pin. The enable input is CMOS-compatible with internal pull-down current (0.3 µA), and the device includes robust noise immunity. External filtering is unnecessary unless operating in exceptionally noisy environments - in which case a small RC filter (e.g., 10 kΩ + 100 pF) may be added, though not specified in the datasheet.
How does the auto-discharge function work in the NCP4681DMX33TCG?
The NCP4681DMX33TCG integrates an internal N-channel transistor between VOUT and GND that activates automatically when the CE pin is driven low. This provides a low-impedance discharge path, collapsing the output voltage rapidly (<1 ms into 10 µF) - eliminating residual charge that could interfere with system reset or cause back-powering of upstream circuitry.
Can the NCP4681DMX33TCG operate with a 0.1 µF ceramic output capacitor?
Yes, the NCP4681DMX33TCG is explicitly characterized and guaranteed stable with a minimum 0.1 µF ceramic output capacitor (X5R/X7R), as confirmed in the Electrical Characteristics table and Application Information section. Larger values improve transient response but are not required for stability - unlike many older LDOs that demand ≥1 µF or specific ESR ranges.
What is the thermal resistance (RJA) of the NCP4681DMX33TCG in its XDFN4 package?
The thermal resistance from junction-to-air (RJA) for the NCP4681DMX33TCG in the XDFN4 0.8×0.8 mm package is 350°C/W, as specified in the Thermal Characteristics table. This value assumes standard JEDEC PCB mounting conditions; actual performance improves significantly with proper thermal pad soldering to a copper pour.
NCP4681DMX33TCG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 4-XFDFN Exposed Pad
- 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):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.35V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 2 µA
- Current - Supply (Max):
- -
- PSRR:
- 25dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-XDFN (0.8x0.8)
NCP4681DMX33TCG FAQ
1.How can I place an order for NCP4681DMX33TCG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP4681DMX33TCG 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 NCP4681DMX33TCG reliable?
The price and inventory of NCP4681DMX33TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4681DMX33TCG is usually 5 days.
3.What payment methods are accepted for NCP4681DMX33TCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP4681DMX33TCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP4681DMX33TCG?
NCP4681DMX33TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP4681DMX33TCG 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 NCP4681DMX33TCG?
For technical support, including NCP4681DMX33TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4681DMX33TCG requirements.
6.How does Aetrix verify that NCP4681DMX33TCG is sourced from the original manufacturer or authorized distributors?
All NCP4681DMX33TCG 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 NCP4681DMX33TCG meets industry standards.
7.What is the process for return or replacement of NCP4681DMX33TCG?
All NCP4681DMX33TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP4681DMX33TCG, 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 NCP4681DMX33TCG part is unused and in its original packaging.
Return procedure for NCP4681DMX33TCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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