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onsemi NCP4685ESQ33T1G
- Part No.:
- NCP4685ESQ33T1G
- Manufacturer:
- onsemi
- Package:
- SC-82A, SOT-343
- Datasheet:
-
NCP4685ESQ33T1G.pdf
- Description:
- IC REG LINEAR 3.3V 150MA SC82AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,473
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Product details
Overview
NCP4685ESQ33T1G from onsemi is a 3.3 V, 150 mA CMOS low-dropout linear regulator optimized for ultra-low quiescent current (1.0 µA typical) in always-on applications. It operates from 1.70 V to 5.25 V input, delivers ±0.8% output voltage accuracy over temperature, and features 0.24 V dropout at 150 mA - enabling stable power delivery in space-constrained battery-powered sensors and IoT edge nodes.
For engineers reviewing the NCP4685ESQ33T1G datasheet, pinout, applications, or equivalent options, key selection criteria include its guaranteed 150 mA output capability, ceramic-capacitor stability (≥0.1 µF), ±40 ppm/°C temperature coefficient, and absence of enable functionality - distinguishing it from the CE-equipped NCP4682 family.
Technical Context
The NCP4685ESQ33T1G implements a PMOS pass transistor architecture with internal bandgap reference and error amplifier, delivering high PSRR (30 dB at 1 kHz) and low output noise (70 µVRMS). Its fixed 3.3 V output is trimmed during wafer test to ensure ±0.8% initial accuracy across the −40°C to +85°C operating range.
No enable logic is integrated - the device remains continuously active when powered within its 1.70–5.25 V input range. Current fold-back protection activates under short-circuit conditions, limiting output current to ~40 mA while reducing thermal stress without latch-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±0.8% (ensures reliable 3.3 V rail for MCU I/O, sensors, and RF modules) |
| Max Output Current | 150 mA continuous (supports multiple low-power peripherals from single LDO) |
| Quiescent Current | 1.0 µA typical (enables >10-year battery life in coin-cell-powered devices) |
| Dropout Voltage | 0.24 V at 150 mA (allows operation down to 3.54 V input, extending usable battery range) |
| Input Voltage Range | 1.70 V to 5.25 V (compatible with Li-ion, Li-Po, 2xAA, and regulated 5 V supplies) |
| PSRR @ 1 kHz | 30 dB (attenuates switching noise from upstream DC-DC converters) |
| Stability | With ≥0.1 µF ceramic output capacitor (eliminates need for costly tantalum or large electrolytics) |
Pinout & Package
Package: SC−82AB (Case 419C), 3-pin surface-mount package measuring 1.8 × 1.15 × 0.8 mm (max), Pb-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.70–5.25 V; requires local 0.1 µF ceramic decoupling capacitor |
| GND | Ground reference | Low-impedance return path; PCB thermal pad must be connected to ground plane for thermal relief |
| VOUT | Regulated output | Delivers stable 3.3 V; supports ≥0.1 µF ceramic output capacitor for loop stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 1.0 µA typical enables multi-year operation on CR2032 or BR1225 batteries |
| High output accuracy | ±0.8% over −40°C to +85°C ensures reliable logic-level compliance for 3.3 V interfaces |
| Ceramic-capacitor stability | Stable with ≥0.1 µF X5R/X7R ceramics - reduces BOM cost and board area vs. tantalum |
| Current fold-back protection | Self-limiting short-circuit response prevents thermal runaway and enables safe fault recovery |
| Low temperature coefficient | ±40 ppm/°C minimizes output drift across industrial temperature ranges |
Applications
| Wearable Health Sensors | Smart Home Motion Detectors |
|---|---|
Use Scenario: Continuous heart-rate monitoring using optical sensor ICs and BLE SoCs powered by coin-cell batteries. IC Role / Device Role / Timing Role: Primary 3.3 V power source for analog front-end and wireless transceiver. Use Value: 1.0 µA quiescent current extends CR2032 battery life beyond 3 years while maintaining ±0.8% regulation for ADC reference stability. |
Use Scenario: PIR-based occupancy detection node with wake-on-motion and periodic BLE beaconing. IC Role / Device Role / Timing Role: Always-on 3.3 V supply for ultra-low-power microcontroller and RF transceiver. Use Value: 0.24 V dropout allows operation until battery voltage drops to 3.54 V, maximizing usable energy from alkaline cells. |
| Industrial Wireless Sensor Nodes | USB-C Powered Peripherals |
Use Scenario: LoRaWAN node monitoring temperature/humidity in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Precision 3.3 V rail for sensor signal conditioning and sub-GHz transceiver. Use Value: ±40 ppm/°C tempco ensures <±10 mV output drift from −40°C to +85°C, preserving sensor measurement integrity. |
Use Scenario: USB-C powered audio dongle requiring clean 3.3 V for DAC and digital interface logic. IC Role / Device Role / Timing Role: Post-regulation filter for noisy 5 V USB-C VBUS-derived supply. Use Value: 30 dB PSRR at 1 kHz suppresses high-frequency switching noise from buck converter feeding the LDO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3302E/TT | 1.8 µA IQ, same 3.3 V output, SOT-23-3 package, no fold-back protection | Lacks current fold-back; less robust under sustained short-circuit conditions | Prefer NCP4685ESQ33T1G where fault resilience is critical in unattended deployments |
| Torex XC6206P332MR-G | 1.0 µA IQ, same 3.3 V output, SOT-23-3, 100 mA max output | Lower 100 mA current rating limits use with higher-load peripherals | Select NCP4685ESQ33T1G when full 150 mA capability is required for multi-peripheral designs |
Compared with MCP1700T-3302E/TT and XC6206P332MR-G, the NCP4685ESQ33T1G uniquely combines 150 mA output, fold-back protection, and 1.0 µA quiescent current in the compact SC-82AB package - making it optimal for space- and power-constrained always-on systems.
Availability
NCP4685ESQ33T1G is available at Aetrix Electronics and suitable for wearable health sensors, smart home motion detectors, and industrial wireless sensor nodes requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for NCP4685ESQ33T1G 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 (Nasdaq: ON) is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The NCP4685ESQ33T1G belongs to onsemi's ultra-low-IQ LDO portfolio, engineered specifically for battery-powered edge devices where multi-year operation and minimal voltage drift are non-negotiable design requirements.
FAQ
What is the maximum input voltage rating for the NCP4685ESQ33T1G?
The absolute maximum input voltage for the NCP4685ESQ33T1G is 6.0 V per the Absolute Maximum Ratings table. However, the recommended operating input voltage range is strictly 1.70 V to 5.25 V. Operation above 5.25 V is not guaranteed and may compromise reliability or parametric performance - the NCP4685ESQ33T1G must remain within this 1.70–5.25 V window for full specification compliance.
Does the NCP4685ESQ33T1G include an enable (CE) pin?
No, the NCP4685ESQ33T1G does not include an enable pin. Unlike the NCP4682 series, the NCP4685 variant is designed for always-on operation with no control logic. The SC-82AB package has only three terminals: VIN, GND, and VOUT. Any requirement for on/off control necessitates external circuitry - the NCP4685ESQ33T1G itself provides no enable functionality.
What output capacitor value is required for stable operation of the NCP4685ESQ33T1G?
The NCP4685ESQ33T1G is stable with a minimum 0.1 µF ceramic output capacitor (X5R or X7R dielectric), as confirmed in the Electrical Characteristics and Application Information sections. Larger values improve transient response but are not required for stability. Tantalum capacitors are discouraged due to potential ESR-induced oscillation - the NCP4685ESQ33T1G is optimized for ceramic-only output networks.
How does the current fold-back protection work in the NCP4685ESQ33T1G?
The NCP4685ESQ33T1G employs fold-back current limiting: under short-circuit or severe overload, output current decreases as output voltage collapses - limiting peak power dissipation and preventing thermal damage. At VOUT = 0 V, short-circuit current is typically 40 mA. This behavior is intrinsic to the IC's internal circuitry and requires no external components - the NCP4685ESQ33T1G self-protects without latch-up or shutdown.
Is the NCP4685ESQ33T1G compatible with lead-free reflow soldering processes?
Yes, the NCP4685ESQ33T1G is a Pb-free device packaged in SC-82AB (Case 419C) and qualified for standard lead-free reflow profiles per JEDEC J-STD-020. Its maximum peak reflow temperature is 260°C, and the package complies with RoHS Directive 2011/65/EU. Thermal characteristics including RJA = 263°C/W assume proper PCB thermal pad connection to ground plane per onsemi's mounting recommendations.
NCP4685ESQ33T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- 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):
- 0.32V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 1.5 µA
- Current - Supply (Max):
- -
- PSRR:
- 30dB (1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-82AB
NCP4685ESQ33T1G FAQ
1.How can I place an order for NCP4685ESQ33T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP4685ESQ33T1G 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 NCP4685ESQ33T1G reliable?
The price and inventory of NCP4685ESQ33T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4685ESQ33T1G is usually 5 days.
3.What payment methods are accepted for NCP4685ESQ33T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP4685ESQ33T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP4685ESQ33T1G?
NCP4685ESQ33T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP4685ESQ33T1G 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 NCP4685ESQ33T1G?
For technical support, including NCP4685ESQ33T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4685ESQ33T1G requirements.
6.How does Aetrix verify that NCP4685ESQ33T1G is sourced from the original manufacturer or authorized distributors?
All NCP4685ESQ33T1G 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 NCP4685ESQ33T1G meets industry standards.
7.What is the process for return or replacement of NCP4685ESQ33T1G?
All NCP4685ESQ33T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP4685ESQ33T1G, 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 NCP4685ESQ33T1G part is unused and in its original packaging.
Return procedure for NCP4685ESQ33T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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