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onsemi NCP4681DSQ28T1G
- Part No.:
- NCP4681DSQ28T1G
- Manufacturer:
- onsemi
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
NCP4681DSQ28T1G.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SC88A
- Quantity:
- Payment:
- Shipping:
Inventory:2,489
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Product details
Overview
NCP4681DSQ28T1G from onsemi is a 150 mA ultra-low-quiescent-current CMOS linear voltage regulator with 2.8 V fixed output, 0.28 V dropout at 150 mA, ±1.0% output accuracy, and integrated enable (CE) pin for standby mode. It delivers stable power to low-power microcontrollers and sensors in space-constrained portable electronics.
For engineers reviewing the NCP4681DSQ28T1G datasheet, pinout, applications, or equivalent options, this page provides verified technical context, package mapping, real-world use cases, and validated alternative options for battery-powered embedded designs requiring sub-1 µA quiescent current and ceramic-capacitor stability.
Technical Context
The NCP4681DSQ28T1G implements a CMOS-based LDO architecture with built-in constant-slope soft-start to prevent output overshoot and minimize inrush current. Its CE pin enables active-high control of regulation, reducing supply current to ≤1.0 µA in standby mode.
It operates across 1.40 V–5.25 V input range, supports 0.1 µF ceramic output capacitors, and features fold-back current limiting and thermal shutdown. The SC-70-5 package provides compact footprint while maintaining thermal resistance of 263 °C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±1.0% - ensures precise biasing for 2.8 V I/O domains and low-voltage logic. |
| Max Output Current | 150 mA - sufficient for powering single-core MCUs, sensors, or RF transceivers in portable devices. |
| Dropout Voltage | 0.28 V at 150 mA - enables operation down to VIN = 3.08 V, extending battery runtime in Li-ion and coin-cell applications. |
| Quiescent Current | 1 µA typical - minimizes standby power loss, critical for multi-year battery life in IoT endpoints. |
| Input Voltage Range | 1.40 V to 5.25 V - compatible with single-cell LiFePO₄, alkaline, and regulated system rails. |
| Line Regulation | 0.02%/V typical - maintains tight output stability despite input rail fluctuations in noisy power environments. |
| Stability | With ≥0.1 µF ceramic capacitor - eliminates need for tantalum or electrolytic caps, reducing BOM cost and board area. |
Pinout & Package
Package: SC-70-5 (Case 419A), 1.9 mm × 1.35 mm × 0.9 mm, Pb-free, thermally enhanced with exposed pad connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VOUT) | Regulated output | Delivers stable 2.8 V to load; requires local 0.1 µF ceramic decoupling. |
| 2 (GND) | Ground reference | Primary return path; connects to PCB ground plane and exposed thermal pad. |
| 3 (CE) | Enable control input | Active-high logic input; drives regulator ON when ≥1.0 V, reduces IQ to ≤1.0 µA when pulled low. |
| 4 (VIN) | Input supply | Accepts 1.40–5.25 V; requires 0.1 µF ceramic decoupling adjacent to pin. |
| 5 (NC) | No connection | Internally unconnected; must remain floating or tied to GND per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1 µA typical in active mode - extends shelf life and operational duration in always-on sensor nodes. |
| Integrated soft-start | Constant-slope ramp-up - eliminates output overshoot and inrush stress on downstream capacitors and ICs. |
| Auto-discharge function | Internal VOUT-to-GND discharge transistor - rapidly collapses output during disable, preventing latch-up in cascaded power domains. |
| Fold-back current protection | Reduces output current and voltage under overload - protects IC and source during short-circuit events without thermal runaway. |
| Ceramic capacitor compatibility | Stable with ≥0.1 µF X7R/X5R ceramics - avoids ESR dependency, simplifies layout, and improves reliability vs. tantalum. |
Applications
| Wearable Health Monitors | Smart Home Sensors |
|---|---|
Use Scenario: Continuous ECG/PPG sensing in wrist-worn devices powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Primary 2.8 V supply for analog front-end and BLE SoC during active measurement cycles. Use Value: 1 µA quiescent current enables >3-year battery life; 0.28 V dropout allows full utilization of coin cell's 2.0–3.0 V discharge curve. |
Use Scenario: Battery-backed occupancy/motion sensor node operating in sleep-then-wake cycles. IC Role / Device Role / Timing Role: Regulated 2.8 V rail for PIR sensor interface and ultra-low-power MCU during wake periods. Use Value: CE-controlled standby mode cuts system IQ to sub-µA level; soft-start prevents false triggers during power-up. |
| Industrial Wireless Transmitters | Portable Diagnostic Tools |
Use Scenario: LoRaWAN endpoint transmitting temperature/humidity data every 10 minutes from AA batteries. IC Role / Device Role / Timing Role: Stable 2.8 V supply for RF transceiver and microcontroller during brief TX bursts. Use Value: Fold-back protection withstands transient loads up to 180 mA; ceramic-capacitor stability ensures clean RF performance. |
Use Scenario: Handheld medical device with OLED display and precision ADC, powered by rechargeable Li-ion. IC Role / Device Role / Timing Role: Clean 2.8 V bias for display driver and analog signal chain, isolated from noisy digital domains. Use Value: 0.02%/V line regulation rejects ripple from switching charger; PSRR of 25 dB at 1 kHz suppresses conducted noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2802E/TT | 250 mA output, 1.6 µA IQ, no auto-discharge, SOT-23-3 package | Lacks CE pin and output discharge; requires external enable circuitry for low-power sequencing | Choose when higher output current is needed and auto-discharge is not required; verify thermal margin at 150 mA in SOT-23. |
| Torex XC6206P282MR-G | 150 mA, 1 µA IQ, no CE pin, SC-70-5, no auto-discharge | Fixed-enable operation only; no standby mode; lacks internal discharge path for fast VOUT collapse | Use where simplified control is acceptable and rapid output discharge is handled externally; confirm PSRR (15 dB @ 1 kHz) meets noise requirements. |
Compared with MCP1700T-2802E/TT and XC6206P282MR-G, the NCP4681DSQ28T1G uniquely combines CE-controlled standby, auto-discharge, and 0.28 V dropout in SC-70-5 - enabling tighter power budgeting and cleaner power sequencing in space-limited, battery-critical systems.
Availability
NCP4681DSQ28T1G is available at Aetrix Electronics and suitable for wearable health monitors, smart home sensors, and industrial wireless transmitters requiring stable component supply with guaranteed long-term manufacturability.
Supply support for NCP4681DSQ28T1G 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 technologies for automotive, industrial, cloud, and IoT applications.
The NCP4681 series belongs to onsemi's ultra-low-IQ LDO portfolio, designed specifically for battery-powered edge devices demanding multi-year operation, rapid power-state transitions, and minimal PCB footprint.
FAQ
What is the maximum input voltage rating for the NCP4681DSQ28T1G?
The absolute maximum input voltage for the NCP4681DSQ28T1G is 6.0 V. However, the recommended operating maximum is 5.25 V per electrical characteristics. Operation above 5.25 V is permitted only up to 5.50 V for cumulative durations ≤500 hours, as specified in Note 3 of the datasheet. Exceeding these limits risks permanent damage or accelerated degradation.
Does the NCP4681DSQ28T1G require an external pull-up resistor on the CE pin?
No, the NCP4681DSQ28T1G does not require an external pull-up on the CE pin. It includes an internal pull-down current source (≤0.3 µA), so CE can be directly driven by a GPIO or left unconnected to default to enabled state. If unused, connecting CE to VIN ensures continuous operation without adding leakage paths.
Can the NCP4681DSQ28T1G operate stably with a 0.047 µF ceramic output capacitor?
No - the NCP4681DSQ28T1G requires ≥0.1 µF ceramic output capacitance for guaranteed stability, as confirmed in the Electrical Characteristics table and Application Information section. Using 0.047 µF may cause oscillation or poor transient response, especially under load steps. Always use 0.1 µF or larger X7R/X5R ceramic capacitors placed adjacent to VOUT and GND pins.
What is the thermal resistance (RJA) of the NCP4681DSQ28T1G in its SC-70 package?
The junction-to-air thermal resistance (RJA) for the NCP4681DSQ28T1G in SC-70 package is 263 °C/W, as specified in the Thermal Characteristics table on page 3 of the datasheet. This value assumes standard JEDEC high-K test board conditions; actual performance improves with PCB copper pour connected to the exposed pad and GND plane.
How does the auto-discharge feature of the NCP4681DSQ28T1G function during shutdown?
When the CE pin is pulled low, the NCP4681DSQ28T1G activates an internal N-channel transistor between VOUT and GND, discharging the output capacitor rapidly. This prevents residual voltage from holding downstream logic in undefined states or causing unintended wake-ups - a key requirement in systems with strict power-domain isolation, such as those using multiple LDOs in sequence.
NCP4681DSQ28T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.4V @ 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:
- SC-88A (SC-70-5/SOT-353)
NCP4681DSQ28T1G FAQ
1.How can I place an order for NCP4681DSQ28T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP4681DSQ28T1G 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 NCP4681DSQ28T1G reliable?
The price and inventory of NCP4681DSQ28T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4681DSQ28T1G is usually 5 days.
3.What payment methods are accepted for NCP4681DSQ28T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP4681DSQ28T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP4681DSQ28T1G?
NCP4681DSQ28T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP4681DSQ28T1G 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 NCP4681DSQ28T1G?
For technical support, including NCP4681DSQ28T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4681DSQ28T1G requirements.
6.How does Aetrix verify that NCP4681DSQ28T1G is sourced from the original manufacturer or authorized distributors?
All NCP4681DSQ28T1G 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 NCP4681DSQ28T1G meets industry standards.
7.What is the process for return or replacement of NCP4681DSQ28T1G?
All NCP4681DSQ28T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP4681DSQ28T1G, 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 NCP4681DSQ28T1G part is unused and in its original packaging.
Return procedure for NCP4681DSQ28T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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