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onsemi NCP731ADN330R2G
- Part No.:
- NCP731ADN330R2G
- Manufacturer:
- onsemi
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
NCP731ADN330R2G.pdf
- Description:
- LDO REGULATOR, 150 MA, 38 V, 8 U
- Quantity:
- Payment:
- Shipping:
Inventory:2,829
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Product details
Overview
NCP731ADN330R2G from onsemi is a fixed-output 3.3 V, 150 mA low-noise LDO regulator with 8 µVRMS noise (10 Hz–100 kHz), 290 mV typical dropout at full load, and 48 µA quiescent current. It operates from 2.7 V to 38 V input and delivers high-precision voltage rails for analog signal chains in op-amps, ADCs, and audio systems.
For engineers reviewing the NCP731ADN330R2G datasheet, pinout, applications, or equivalent options, key selection criteria include ultra-low noise performance, wide VIN range compatibility, thermal shutdown protection, soft-start programmability, and stable operation with 1 µF ceramic output capacitors.
Technical Context
The NCP731ADN330R2G integrates a CMOS pass transistor with internal reference (1.2 V), UVLO (2.55 V typ.), and precision error amplifier. Its architecture supports fast transient response via optional feed-forward capacitor (CFF) and programmable soft-start (CSS) to control inrush current and output ramp rate.
It features dual protection: over-current limiting (295 mA typ.) and thermal shutdown (170 °C typ., 10 °C hysteresis). The device remains stable across −40 °C to +125 °C junction temperature with ±0.6% output accuracy at 25 °C and ±1.5% over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±0.6% at 25 °C; ±1.5% over −40 °C to +125 °C - ensures stable biasing for precision analog ICs |
| Max Output Current | 150 mA continuous - sufficient for rail supply of multiple op-amps or small-signal ADCs |
| Input Voltage Range | 2.7 V to 38 V - supports wide-input industrial, automotive, and post-DC/DC applications |
| Output Noise | 8 µVRMS (10 Hz–100 kHz) - enables clean power for noise-sensitive analog circuits |
| Quiescent Current | 48 µA typ. - minimizes standby power in battery-backed instrumentation |
| Dropout Voltage | 230 mV typ. at 150 mA - allows regulation down to VIN = 3.53 V while maintaining 3.3 V output |
| PSRR | 80 dB at 10 Hz, 42 dB at 100 kHz - suppresses ripple from upstream switching converters |
Pinout & Package
Package: Micro-8 EP (3 mm × 3 mm, 0.5 mm pitch, exposed pad), case 846AT - thermally optimized for high-power-density PCB layouts with low RθJB = 16 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | LDO regulated output | Delivers stable 3.3 V; requires local 1 µF ceramic capacitor to GND for stability |
| 2: ADJ/FF | Feed-forward capacitor terminal (FIX version) | Connect CFF (e.g., 10 nF) to OUT to improve PSRR and reduce noise; left open if not used |
| 3, 7: NC | No-connect terminals | Not internally bonded; must be left floating or tied to GND per layout best practice |
| 4: GND | Power ground reference | Primary return path; connects to EPAD for thermal and electrical integrity |
| 5: EN | Enable control input | Active-high logic (VEN > 0.9 V); no internal pull-up; tie to IN if always enabled |
| 6: SS | Soft-start timing input | Charge CSS (e.g., 10 nF) to set startup time (~14 ms); floating = fast start (~0.5 ms) |
| 8: IN | Input power supply | Accepts 2.7–38 V; requires ≥1 µF ceramic input capacitor close to pin |
| EP: EPAD | Exposed thermal pad | Mandatory connection to GND plane for thermal dissipation and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise regulation | 8 µVRMS (10 Hz–100 kHz) - preserves SNR in precision analog front-ends without external filtering |
| Wide input voltage support | 2.7 V to 38 V - eliminates need for pre-regulation in 24 V industrial or 36 V automotive systems |
| Programmable soft-start | Startup time adjustable from 0.5 ms to >100 ms via CSS capacitor - prevents inrush-induced rail collapse |
| Stable with minimal capacitance | Guaranteed stability with 1 µF ceramic COUT - reduces BOM count and board area vs. legacy LDOs requiring ≥10 µF |
| Integrated protections | Thermal shutdown (170 °C) and current limiting (295 mA) - enables robust operation without external circuitry |
Applications
| Audio Signal Chain Power | Precision Data Acquisition |
|---|---|
Use Scenario: Supplying low-noise bias rails to audio op-amps and DACs in portable mixers and studio interfaces. IC Role / Device Role / Timing Role: Primary 3.3 V analog supply delivering ultra-clean voltage to minimize audible hiss and distortion. Use Value: 8 µVRMS noise ensures >110 dB SNR in 24-bit audio paths without additional LC filtering. | Use Scenario: Powering SAR ADCs and instrumentation amplifiers in handheld multimeters and sensor nodes. IC Role / Device Role / Timing Role: Stable reference rail generator enabling accurate 16+ bit conversion linearity. Use Value: ±0.6% output accuracy and <1.5 mV dropout drift preserve absolute measurement fidelity across temperature. |
| Post-Regulation for DC/DC Outputs | Industrial Sensor Transmitter |
Use Scenario: Filtering ripple from buck converter outputs feeding analog subsystems in PLC I/O modules. IC Role / Device Role / Timing Role: Final-stage low-noise LDO after switching regulator to meet analog rail noise budgets. Use Value: 80 dB PSRR at 10 Hz suppresses low-frequency switching artifacts that degrade sensor signal integrity. | Use Scenario: Providing regulated 3.3 V to 4–20 mA loop-powered sensors and HART modems in hazardous-area transmitters. IC Role / Device Role / Timing Role: Input-tolerant local regulator enabling direct connection to 24 V loop supply. Use Value: 38 V max input rating and 48 µA quiescent current allow reliable operation with minimal headroom and low standby loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70733PDQNR | Lower max input (5.5 V), lower noise (5.5 µVRMS), smaller 1.5 mm × 1.5 mm DQN package | Only suitable for ≤5.5 V systems; cannot replace NCP731ADN330R2G in 24 V industrial applications | Select when ultra-low noise and space-constrained PCBs outweigh input voltage requirements |
| MCP1826-3302E/DB | Higher quiescent current (120 µA), wider dropout (400 mV @ 150 mA), same 3.3 V fixed output | Less efficient under high VIN–VOUT differential; higher thermal stress in compact enclosures | Choose only if onsemi supply chain constraints require second-source availability |
Compared with TLV70733PDQNR and MCP1826-3302E/DB, the NCP731ADN330R2G uniquely combines 38 V input tolerance, 8 µVRMS noise, and 48 µA quiescent current-enabling single-LDO solutions in high-voltage analog systems where alternatives require cascaded regulation or compromise on noise or efficiency.
Availability
NCP731ADN330R2G is available at Aetrix Electronics and suitable for industrial instrumentation, precision data acquisition, and audio signal chain designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for NCP731ADN330R2G 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 is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon-based solutions for automotive, industrial, cloud, and IoT applications.
The NCP731ADN330R2G belongs to onsemi's precision analog LDO family, engineered specifically for noise-critical analog power delivery in high-reliability systems where clean voltage rails directly impact measurement accuracy and signal fidelity.
FAQ
What is the maximum input voltage rating for the NCP731ADN330R2G?
The NCP731ADN330R2G supports an absolute maximum input voltage of 40 V, with recommended operating range from 2.7 V to 38 V. This wide VIN capability allows direct use with 24 V industrial buses and 36 V automotive systems without pre-regulation. Exceeding 40 V risks permanent damage per the Absolute Maximum Ratings table.
Does the NCP731ADN330R2G require external capacitors for stability?
Yes, the NCP731ADN330R2G requires both input (CIN) and output (COUT) ceramic capacitors. A minimum 1 µF X5R/X7R ceramic capacitor is required at COUT, placed close to the OUT and GND pins. CIN should also be ≥1 µF. Larger COUT values (e.g., 10 µF) improve PSRR and transient response but are not mandatory for basic stability.
How does the soft-start function work on the NCP731ADN330R2G?
The NCP731ADN330R2G uses an external capacitor (CSS) on the SS pin to control startup ramp time. With CSS = 10 nF, typical startup time is 14 ms; with CSS unconnected, it drops to ~0.5 ms. The internal 910 nA charging current linearly ramps the SS pin voltage, which in turn controls the output voltage slew rate-preventing inrush current spikes during power-up.
Is the NCP731ADN330R2G compatible with ceramic output capacitors having low ESR?
Yes-the NCP731ADN330R2G is explicitly designed to remain stable with ceramic output capacitors having ESR as low as 1 mΩ. Unlike older LDOs requiring minimum ESR for phase margin, this device uses an advanced internal compensation scheme that ensures stability across the full 1 µF–1000 µF range and 1–50 mΩ ESR, simplifying capacitor selection and reducing cost.
What protection features are integrated into the NCP731ADN330R2G?
The NCP731ADN330R2G integrates over-current limiting (295 mA typ.), thermal shutdown (170 °C junction threshold with 10 °C hysteresis), and input under-voltage lockout (UVLO at 2.55 V typ.). These functions operate autonomously without external components, protecting both the IC and downstream circuitry during fault conditions such as short circuits or excessive ambient temperature.
NCP731ADN330R2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 38V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.48V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- -
- PSRR:
- 80dB ~ 48dB (10Hz ~ 1MHz)
- Control Features:
- Enable, Soft Start
- Protection Features:
- Over Temperature, Short Circuit, Under Voltage Lockout (UVLO)
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
NCP731ADN330R2G FAQ
1.How can I place an order for NCP731ADN330R2G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP731ADN330R2G 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 NCP731ADN330R2G reliable?
The price and inventory of NCP731ADN330R2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP731ADN330R2G is usually 5 days.
3.What payment methods are accepted for NCP731ADN330R2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP731ADN330R2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP731ADN330R2G?
NCP731ADN330R2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP731ADN330R2G 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 NCP731ADN330R2G?
For technical support, including NCP731ADN330R2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP731ADN330R2G requirements.
6.How does Aetrix verify that NCP731ADN330R2G is sourced from the original manufacturer or authorized distributors?
All NCP731ADN330R2G 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 NCP731ADN330R2G meets industry standards.
7.What is the process for return or replacement of NCP731ADN330R2G?
All NCP731ADN330R2G units undergo pre-shipment inspection (PSI). If there is an issue with NCP731ADN330R2G, 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 NCP731ADN330R2G part is unused and in its original packaging.
Return procedure for NCP731ADN330R2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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