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onsemi NCP4688DMU33TCG
- Part No.:
- NCP4688DMU33TCG
- Manufacturer:
- onsemi
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
NCP4688DMU33TCG.pdf
- Description:
- IC REG LINEAR 3.3V 150MA 4UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,202
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Product details
Overview
NCP4688DMU33TCG from onsemi is a CMOS low-noise 150 mA LDO linear voltage regulator delivering a fixed 3.3 V output with ±1% accuracy, 10 µVRMS output noise, and 80 dB PSRR at 1 kHz - designed for powering sensitive RF modules and low-voltage microcontrollers in space-constrained industrial and portable systems.
For engineers reviewing the NCP4688DMU33TCG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage (0.20–0.28 V at 150 mA), auto-discharge NMOS (60 Ω), thermal performance in DFN1010 (RJA = 250 °C/W), and CE-controlled enable functionality with internal pull-down.
Technical Context
The NCP4688DMU33TCG integrates a precision bandgap reference, low-noise error amplifier, and current-limit protection within a CMOS architecture optimized for stability with 1.0 µF ceramic output capacitors. Its internal auto-discharge transistor actively sinks the output when disabled, reducing residual voltage decay time.
It operates across 2.0–5.25 V input range with 3.3 V fixed output, supports 1 mA to 150 mA load current, and features a high-impedance CE pin (threshold VCEH = 1.0 V, VCEL = 0.4 V) enabling clean power sequencing in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1% over −40°C to +85°C - ensures stable core logic supply for 3.3 V microcontrollers and interface ICs. |
| Max Output Current | 150 mA - sufficient for powering single-core MCUs, sensors, or RF transceivers without external pass devices. |
| Dropout Voltage | 0.20–0.28 V at 150 mA - enables operation from 3.5 V input while maintaining regulation, critical for battery-powered designs. |
| Output Noise | 10 µVRMS (10 Hz–100 kHz) - preserves signal integrity in analog front-ends and RF bias rails where noise coupling degrades SNR. |
| PSRR | 80 dB @ 1 kHz, 75 dB @ 10 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Enable Threshold | VCEH = 1.0 V min, VCEL = 0.4 V max - compatible with 1.8 V and 3.3 V GPIOs for precise system-level power control. |
| Auto-Discharge | 60 Ω NMOS between VOUT and GND - discharges output capacitor rapidly upon disable, preventing back-powering of downstream circuitry. |
Pinout & Package
Package: UDFN-4 (1.0 mm × 1.0 mm, 0.65 mm pitch), Case 517BR, Pb-free, exposed pad (EP) - optimized for thermal dissipation and PCB area minimization in ultra-compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EP) | Exposed Pad | Thermal path to PCB ground plane; improves RJA by up to 30% when soldered to ≥100 mm² copper pour. |
| 2 | GND | Power ground reference for regulator feedback and internal circuitry; must be low-impedance connection to EP and input/output caps. |
| 3 | CE | Active-high chip enable; internal 0.6 µA pull-down ensures safe default-off state if left floating. |
| 4 | VIN | Input supply pin; requires 1.0 µF ceramic decoupling placed adjacent to pin to ensure transient response and stability. |
| 5 | VOUT | Regulated 3.3 V output; connects directly to load and 1.0 µF ceramic output capacitor - ESR < 100 mΩ required for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 10 µVRMS output noise enables clean power for RF synthesizers and ADC reference supplies without additional filtering. |
| High PSRR | 80 dB at 1 kHz suppresses ripple from noisy switchers, eliminating need for cascaded LC filters in compact designs. |
| Auto-discharge function | 60 Ω internal NMOS discharges VOUT in <100 µs when disabled - prevents latch-up in hot-swap or power-sequenced systems. |
| Ultra-small footprint | 1.0 mm × 1.0 mm DFN package saves >60% board area vs. SOT-23-5, ideal for wearables and IoT edge nodes. |
| ±1% output accuracy | Guaranteed over full temperature and line/load range - eliminates need for post-regulation trimming in production test. |
Applications
| RF Module Power Supply | Industrial Sensor Node |
|---|---|
|
Use Scenario: Powers 2.4 GHz BLE/Wi-Fi transceiver ICs in battery-operated wireless sensor nodes. IC Role / Device Role / Timing Role: Provides ultra-low-noise 3.3 V bias for RF front-end and crystal oscillator circuits. Use Value: 10 µVRMS noise and 80 dB PSRR prevent phase noise degradation and maintain EVM compliance under dynamic load. |
Use Scenario: Supplies 3.3 V to low-power ARM Cortex-M0+ MCU and analog sensor signal chain in factory-floor condition monitors. IC Role / Device Role / Timing Role: Delivers stable, sequenced power with CE control for wake-on-interrupt operation. Use Value: Auto-discharge ensures rapid VOUT collapse during deep sleep, reducing quiescent current to <1 µA system-wide. |
| Portable Medical Device | Automotive Infotainment Interface |
|
Use Scenario: Regulates power for optical pulse oximeter analog front-end and display driver in handheld diagnostics tools. IC Role / Device Role / Timing Role: Low-noise 3.3 V source for precision ADC reference and op-amp bias rails. Use Value: ±1% output accuracy over −40°C to +85°C eliminates calibration drift across clinical operating environments. |
Use Scenario: Supplies 3.3 V to CAN transceiver interface logic and touch controller in automotive head units. IC Role / Device Role / Timing Role: Enables controlled power-up/down sequencing via CE pin synchronized with main SoC reset. Use Value: 0.28 V dropout allows operation from 3.6 V battery rail even at end-of-life, extending functional uptime. |
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 | 150 mA, 3.3 V, 6 µVRMS noise, no auto-discharge, SOT-23-3 package | Lacks CE pin and discharge function; limited to simpler on/off control | Choose when board space permits SOT-23-3 and auto-discharge is unnecessary. |
| Torex XC6206P332MR-G | 150 mA, 3.3 V, ±2% accuracy, 40 µVRMS noise, no CE pin, SOT-23-3 | Higher noise and looser tolerance; no enable or discharge capability | Select only for cost-sensitive, non-noise-critical applications where CE sequencing is handled externally. |
Compared with MCP1700T-3302E/TT and XC6206P332MR-G, the NCP4688DMU33TCG uniquely combines ultra-low noise, tight accuracy, CE control, and integrated auto-discharge in a 1.0×1.0 mm DFN - making it optimal for RF, medical, and sequenced power systems where all four attributes are concurrently required.
Availability
NCP4688DMU33TCG is available at Aetrix Electronics and suitable for RF modules, industrial sensor nodes, and portable medical devices requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for NCP4688DMU33TCG 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, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The NCP4688DMU33TCG belongs to onsemi's NCP4688 family of low-noise, auto-discharge LDOs - engineered specifically for noise-sensitive RF, portable, and battery-powered applications demanding high PSRR and fast turn-off behavior.
FAQ
What is the maximum input voltage rating for the NCP4688DMU33TCG?
The NCP4688DMU33TCG has an absolute maximum input voltage of 6 V. Operation above this level risks permanent damage. For reliable continuous use, the recommended input range is 2.0 V to 5.25 V - ensuring proper regulation and thermal margin across all load conditions.
Does the NCP4688DMU33TCG require external components for stable operation?
Yes, the NCP4688DMU33TCG requires two 1.0 µF ceramic capacitors: one at VIN (input) and one at VOUT (output), both placed as close as possible to their respective pins. The output capacitor must have ESR < 100 mΩ; tantalum types are discouraged due to instability risk per Figures 42–44 in the datasheet.
How does the auto-discharge feature work in the NCP4688DMU33TCG?
When the CE pin is driven low, the NCP4688DMU33TCG activates an internal 60 Ω NMOS transistor between VOUT and GND. This provides a controlled discharge path, collapsing the output voltage rapidly (<100 µs) to prevent back-powering or unintended wake-up of downstream circuitry.
Can the NCP4688DMU33TCG be used with a 1.8 V enable signal?
Yes - the CE pin threshold is specified as VCEH ≥ 1.0 V (min) and VCEL ≤ 0.4 V (max). A 1.8 V GPIO cleanly exceeds the high-threshold requirement and ensures robust enable/disable margins across voltage and temperature variations.
What is the thermal resistance (RJA) of the NCP4688DMU33TCG in its DFN package?
The NCP4688DMU33TCG in the UDFN-4 (1.0×1.0 mm) package has a typical junction-to-air thermal resistance (RJA) of 250 °C/W under standard JEDEC test conditions. Actual performance improves significantly with ≥100 mm² copper pour connected to the exposed pad.
NCP4688DMU33TCG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 4-UDFN 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):
- 0.28V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- -
- PSRR:
- 80dB ~ 65dB (1kHz ~ 100kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-UDFN (1.0x1.0)
NCP4688DMU33TCG FAQ
1.How can I place an order for NCP4688DMU33TCG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP4688DMU33TCG 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 NCP4688DMU33TCG reliable?
The price and inventory of NCP4688DMU33TCG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4688DMU33TCG is usually 5 days.
3.What payment methods are accepted for NCP4688DMU33TCG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP4688DMU33TCG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP4688DMU33TCG?
NCP4688DMU33TCG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP4688DMU33TCG 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 NCP4688DMU33TCG?
For technical support, including NCP4688DMU33TCG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4688DMU33TCG requirements.
6.How does Aetrix verify that NCP4688DMU33TCG is sourced from the original manufacturer or authorized distributors?
All NCP4688DMU33TCG 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 NCP4688DMU33TCG meets industry standards.
7.What is the process for return or replacement of NCP4688DMU33TCG?
All NCP4688DMU33TCG units undergo pre-shipment inspection (PSI). If there is an issue with NCP4688DMU33TCG, 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 NCP4688DMU33TCG part is unused and in its original packaging.
Return procedure for NCP4688DMU33TCG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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