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onsemi NCP566ST18T3G
- Part No.:
- NCP566ST18T3G
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NCP566ST18T3G.pdf
- Description:
- IC REG LINEAR 1.8V 1.5A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:4,676
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Product details
Overview
NCP566ST18T3G from onsemi is a fixed-output 1.8 V, 1.5 A low-dropout linear regulator in SOT-223 package, featuring 0.9 V dropout at full load, 37 µVRMS output noise, and ultra-fast transient response (1.0 µs). It delivers stable post-regulation for ASICs and high-speed logic in servers, networking equipment, and notebook computers.
For engineers reviewing the NCP566ST18T3G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 1.8 V ±2% output accuracy over −10°C to +105°C, thermal shutdown at 160°C, and compatibility with ceramic/tantalum output capacitors as low as 2.2 µF.
Technical Context
The NCP566ST18T3G implements a voltage-reference-based feedback loop with internal 0.9 V reference and precision resistor divider, enabling tight output regulation across load (10 mA–1.5 A) and temperature (−40°C to +125°C). Its fast loop response stems from optimized internal compensation, supporting stable operation without external frequency compensation.
It integrates three protection mechanisms: current-limiting (1.6–3.5 A), short-circuit protection, and thermal shutdown (160°C junction). Ground current remains low (1.5 mA typical at 1.5 A load), minimizing power loss during high-current operation while maintaining low-noise performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V ±2% (−10°C to +105°C), ±3% (−40°C to +125°C); ensures reliable core logic supply under industrial temperature cycling |
| Dropout Voltage | 0.9 V (typ) at 1.5 A load; enables operation from 2.7 V input when regulating 1.8 V, critical for battery-backed or multi-rail systems |
| Ground Current | 1.5 mA (typ) at 1.5 A output; reduces quiescent power loss by >50% vs. legacy LDOs, extending runtime in portable designs |
| Output Noise | 37 µVRMS (100 Hz–100 kHz); meets low-noise requirements for analog peripherals, ADC references, and RF subsystems |
| Ripple Rejection | 85 dB @ 120 Hz, 75 dB @ 1 kHz (at 1.5 A); suppresses switching noise from upstream DC/DC converters in hybrid power architectures |
| Thermal Shutdown | 160°C (typ); provides fail-safe protection during sustained overload or inadequate heatsinking in compact PCB layouts |
| Current Limit | 1.6 A (min) to 3.5 A (max); allows safe startup into heavy capacitive loads while preventing catastrophic failure during shorts |
Pinout & Package
Package: SOT-223 (Case 318E), thermally enhanced plastic surface-mount package with exposed tab (Pin 2 and thermal pad) for improved heat dissipation. RJA = 107°C/W (standard PCB), RJP = 12°C/W (with 50 mm² copper spreader).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vin | Positive input supply rail; must be ≥2.7 V for 1.8 V regulation; requires local 4.7–150 µF bypass capacitor |
| 2, Tab | GND | Power ground and thermal path; tab connects internally to GND and must be soldered to ≥50 mm² copper pour for thermal integrity |
| 3 | Vout | Regulated 1.8 V output; requires 2.2–150 µF output capacitor with ESR 50 mΩ–2.5 Ω for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast transient response | 1.0 µs recovery time from 10 mA ↔ 1.5 A load step; maintains <±20 mV output deviation in CPU/GPU core supply applications |
| Low-noise regulation | 37 µVRMS integrated noise; eliminates need for additional LC filtering in sensitive analog signal chains |
| Thermally robust design | 160°C thermal shutdown with 12°C/W junction-to-pin resistance; supports continuous 1.5 A operation on 1 oz Cu PCB with minimal heatsink |
| Pb-free & RoHS-compliant | SOT-223 package marked "Pb-Free"; meets IPC/JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) |
| Fixed-output precision | ±2% output tolerance over commercial temp range; eliminates external resistor network, reducing BOM count and layout area |
Applications
| ASIC Power Supply | Networking Equipment |
|---|---|
Use Scenario: Providing clean, tightly regulated 1.8 V supply to high-speed ASIC I/O banks in 10G/25G Ethernet switches. IC Role / Device Role / Timing Role: Post-regulator for intermediate bus conversion, delivering low-noise, fast-transient power to interface logic. Use Value: 85 dB ripple rejection suppresses DC/DC switching noise; 1.0 µs transient response prevents timing violations during burst-mode packet processing. |
Use Scenario: Powering PHY transceivers and SerDes lanes in enterprise routers and base station control cards. IC Role / Device Role / Timing Role: Local point-of-load regulator ensuring stable 1.8 V for high-speed serial interfaces (SFP+, QSFP). Use Value: ±2% output accuracy guarantees compliance with JEDEC JESD8-15A I/O voltage specs; low ground current minimizes thermal impact in dense card layouts. |
| Notebook Computer Core Logic | Medical Imaging Subsystem |
Use Scenario: Regulating 1.8 V for DDR3/DDR4 memory termination and chipset I/O in ultrabook platforms. IC Role / Device Role / Timing Role: Low-noise auxiliary LDO supplying memory interface rails adjacent to high-frequency clock domains. Use Value: 37 µVRMS noise prevents jitter accumulation in memory timing paths; SOT-223 footprint enables placement near BGA packages. |
Use Scenario: Powering analog front-end (AFE) signal conditioning circuits in portable ultrasound and MRI console modules. IC Role / Device Role / Timing Role: Precision analog supply rail decoupling sensitive op-amps and ADC drivers from digital noise sources. Use Value: Stable 1.8 V ±2% output ensures consistent gain calibration; thermal shutdown protects against fault-induced overheating in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TI TPS7A4700RGWR | Adjustable output (1.4–20 V), lower noise (4.5 µVRMS), higher cost, SO-8 package | Requires external resistors; suited for multi-voltage systems needing flexibility over fixed 1.8 V | Select when adjustable output or sub-5 µV noise is mandatory; not drop-in due to different pinout and package |
| STMicroelectronics LD1086DT18R | 1.8 V fixed, 1.5 A, TO-252 package, higher dropout (1.3 V), higher ground current (5 mA) | Larger footprint, lower thermal efficiency; suitable where board space permits larger heatsink | Choose for cost-sensitive industrial designs where SOT-223 thermal limits are exceeded; no PCB redesign needed if TO-252 pad is available |
Compared with TPS7A4700RGWR and LD1086DT18R, the NCP566ST18T3G offers optimal balance of ultra-fast transient response, low noise, and compact SOT-223 thermal performance-making it preferred for space-constrained, high-dynamic-load applications like networking and computing, where fixed 1.8 V simplifies layout and reduces component count.
Availability
NCP566ST18T3G is available at Aetrix Electronics and suitable for servers, networking equipment, and notebook computers requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for NCP566ST18T3G 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 specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The NCP566 series is part of onsemi's high-performance LDO portfolio, designed specifically for post-regulation in high-current, low-noise, fast-transient applications such as ASICs, FPGAs, and high-speed interface power domains.
FAQ
What is the minimum input voltage required for stable operation of the NCP566ST18T3G?
The NCP566ST18T3G requires a minimum input voltage of 2.7 V to maintain regulation at 1.8 V output under full 1.5 A load, based on its 0.9 V typical dropout voltage. Input voltage must remain ≥ (Vout + Vdo) across temperature and load extremes; datasheet specifies 3.4 V minimum for 1.8 V version over −40°C to +125°C operating range to ensure margin.
Does the NCP566ST18T3G require external capacitors, and what values are recommended?
Yes, the NCP566ST18T3G requires both input and output capacitors. A 4.7–150 µF input capacitor improves line transient response, while a 2.2–150 µF output capacitor with ESR between 50 mΩ and 2.5 Ω ensures stability. The device is optimized for 150 µF OSCON + 10 µF OSCON parallel configuration, but standard ceramic or tantalum types within the specified range are fully supported.
How does thermal performance of the NCP566ST18T3G compare between standard PCB and enhanced copper layout?
The NCP566ST18T3G has RJA = 107°C/W on standard JEDEC test board, but RJP = 12°C/W when mounted on a 50 mm² copper heat spreader (1 oz Cu). This means junction temperature rise drops from ~160°C at 1.5 A on standard layout to ~18°C with proper copper, enabling continuous full-load operation without thermal shutdown in well-designed layouts.
Is the NCP566ST18T3G compatible with ceramic output capacitors?
Yes, the NCP566ST18T3G is explicitly characterized and stable with ceramic output capacitors down to 2.2 µF, provided ESR remains between 50 mΩ and 2.5 Ω. Unlike older LDOs, it does not require minimum ESR for stability, making it compatible with low-ESR X7R/X5R ceramics commonly used in high-density PCBs.
What protection features are integrated into the NCP566ST18T3G?
The NCP566ST18T3G integrates three independent protection functions: current limiting (1.6–3.5 A), short-circuit protection, and thermal shutdown at 160°C. These operate autonomously without external components, safeguarding the device and downstream circuitry during overload, wiring faults, or inadequate cooling conditions.
NCP566ST18T3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 9V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.3V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 3 mA
- Current - Supply (Max):
- -
- PSRR:
- 85dB ~ 75db (120Hz ~ 1kHz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223 (TO-261)
NCP566ST18T3G FAQ
1.How can I place an order for NCP566ST18T3G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP566ST18T3G 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 NCP566ST18T3G reliable?
The price and inventory of NCP566ST18T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP566ST18T3G is usually 5 days.
3.What payment methods are accepted for NCP566ST18T3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP566ST18T3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP566ST18T3G?
NCP566ST18T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP566ST18T3G 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 NCP566ST18T3G?
For technical support, including NCP566ST18T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP566ST18T3G requirements.
6.How does Aetrix verify that NCP566ST18T3G is sourced from the original manufacturer or authorized distributors?
All NCP566ST18T3G 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 NCP566ST18T3G meets industry standards.
7.What is the process for return or replacement of NCP566ST18T3G?
All NCP566ST18T3G units undergo pre-shipment inspection (PSI). If there is an issue with NCP566ST18T3G, 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 NCP566ST18T3G part is unused and in its original packaging.
Return procedure for NCP566ST18T3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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