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onsemi NCP566ST25T3G
- Part No.:
- NCP566ST25T3G
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NCP566ST25T3G.pdf
- Description:
- IC REG LINEAR 2.5V 1.5A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:1,498
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Product details
Overview
NCP566ST25T3G from onsemi is a fixed-output 2.5 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 optimized for post-regulation in high-performance digital systems.
For engineers reviewing the NCP566ST25T3G datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed ±2% output voltage accuracy over −10°C to +105°C, thermal shutdown at 160°C, and compatibility with ceramic/tantalum/aluminum-electrolytic output capacitors down to 1.0 µF with 50 mΩ–2.5 Ω ESR.
Technical Context
The NCP566ST25T3G implements a voltage-reference-based feedback loop with internal 0.9 V reference and output-stage transistor optimized for low dropout and fast load-step recovery. Its architecture supports stable operation with 2.2 µF–150 µF output capacitance and maintains ≥75 dB ripple rejection up to 1 kHz at 1.5 A load.
Protection circuitry includes foldback current limiting (1.6–3.5 A), thermal shutdown activation at 160°C, and short-circuit protection. Ground current remains tightly regulated at 1.5 mA typical at full 1.5 A output, enabling high efficiency in battery-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±2% (−10°C to +105°C), ±3% (−40°C to +125°C) - ensures stable core logic supply under industrial temperature cycling |
| Dropout Voltage | 0.9 V typ @ 1.5 A - enables regulation from 3.4 V input, critical for 3.3 V rail post-regulation |
| Output Noise | 37 µVrms (100 Hz–100 kHz) - low enough for noise-sensitive analog/RF subsystems powered from same rail |
| Ripple Rejection | 85 dB @ 120 Hz, 75 dB @ 1 kHz @ 1.5 A - suppresses switching converter ripple without additional filtering |
| Ground Current | 1.5 mA typ @ 1.5 A - minimizes quiescent power loss in always-on subsystems |
| Thermal Shutdown | 160°C - provides fail-safe protection during sustained overload or poor heatsinking |
| Current Limit | 1.6 A min, 3.5 A max - delivers robust short-circuit tolerance while avoiding nuisance tripping |
Pinout & Package
SOT-223 package (Case 318E) with exposed thermal tab (Pin 2 and Tab = GND), rated for 107°C/W junction-to-ambient thermal resistance using 50 mm² copper heat spreader.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Vin | Positive input supply - must be ≥3.4 V for 2.5 V regulation; bypass capacitor required for transient stability |
| 2 & Tab | GND | Power ground and thermal path - tab must be soldered to PCB copper pour for thermal performance |
| 3 | Vout | Regulated 2.5 V output - requires 2.2 µF–150 µF output capacitor with 50 mΩ–2.5 Ω ESR for stability |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast transient response | Load step recovery within microseconds - preserves voltage margin during CPU/GPU burst loads |
| Low-noise regulation | 37 µVrms broadband noise - eliminates need for post-LDO ferrite beads in mixed-signal designs |
| Thermal and current protection | Integrated 160°C shutdown and foldback current limit - prevents catastrophic failure without external circuitry |
| Pb-free SOT-223 package | RoHS-compliant, lead-free finish with exposed thermal tab - simplifies compliance and thermal design |
Applications
| ASIC Power Supplies | Networking Equipment |
|---|---|
Use Scenario: Providing clean, stable 2.5 V supply to ASIC I/O banks or SerDes termination circuits in telecom line cards. IC Role / Device Role / Timing Role: Post-regulator delivering low-noise, low-dropout voltage after primary DC/DC conversion. Use Value: Maintains <±2% output accuracy across temperature and load, ensuring signal integrity and timing margin compliance. | Use Scenario: Powering PHY transceivers and packet buffer memory in enterprise switches and routers. IC Role / Device Role / Timing Role: Local LDO supplying 2.5 V to high-speed interface ICs requiring minimal supply ripple. Use Value: 85 dB ripple rejection at 120 Hz suppresses switching noise from upstream converters, reducing bit error rates. |
| LCD Monitors | Notebook Computers |
Use Scenario: Supplying 2.5 V to timing controllers (TCON) and source driver ICs in panel power trees. IC Role / Device Role / Timing Role: Low-noise, fast-transient LDO supporting dynamic backlight and resolution scaling. Use Value: 37 µVrms noise prevents visible display artifacts; 0.9 V dropout enables efficient use of 3.3 V intermediate rail. | Use Scenario: Regulating 2.5 V for DDR memory termination (SSTL_25) and chipset I/O rails in ultrabook platforms. IC Role / Device Role / Timing Role: High-current LDO with thermal protection for space-constrained mobile motherboard designs. Use Value: 1.5 A capability with 1.5 mA quiescent current balances performance and battery runtime during light-load states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4700RGWR | 2.5 V fixed, 1 A max, 20 µVrms noise, 225 mV dropout @ 1 A - lower noise but 0.5 A less current capacity | Better for ultra-low-noise analog bias rails; insufficient for 1.5 A digital loads | Select only if noise <20 µVrms is mandatory and load ≤1 A |
| MCP1755ST-2502E/DB | 2.5 V fixed, 1.5 A, 0.6 V dropout @ 1.5 A, 45 µVrms noise - lower dropout but higher noise than NCP566ST25T3G | Preferred where input voltage is constrained below 3.1 V; trade-off is increased output ripple sensitivity | Choose when Vin < 3.4 V is unavoidable and noise tolerance >45 µVrms exists |
Compared with TPS7A4700RGWR and MCP1755ST-2502E/DB, the NCP566ST25T3G uniquely balances 1.5 A delivery, 0.9 V dropout, and 37 µVrms noise - making it optimal for 3.3 V-input post-regulation where both current and noise constraints apply.
Availability
NCP566ST25T3G is available at Aetrix Electronics and suitable for ASIC power supplies, networking equipment, and LCD monitor designs requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.
Supply support for NCP566ST25T3G 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 consumer markets.
The NCP566 series is designed as a high-current, low-noise LDO family for post-regulation in digital systems - targeting applications where fast transient response and tight output voltage tolerance are essential.
FAQ
What is the maximum input voltage rating for the NCP566ST25T3G?
The NCP566ST25T3G has an absolute maximum input voltage of 9.0 V. Operation above this level risks permanent damage. For reliable 2.5 V output regulation, the minimum recommended input is 3.4 V to maintain 0.9 V dropout margin at 1.5 A load. Always verify input transient conditions exceed this rating with appropriate clamping or pre-regulation.
Does the NCP566ST25T3G require external protection diodes?
The NCP566ST25T3G does not require external protection diodes under normal operation due to its internal junction design. However, if large output capacitors (>1000 µF) are used and the input voltage may be instantaneously shorted to ground, a 1N4002 diode from Vout to Vin (anode to Vout) is recommended per onsemi Application Note to prevent reverse discharge damage.
What output capacitor types and values ensure stability for the NCP566ST25T3G?
The NCP566ST25T3G remains stable with ceramic, tantalum, or aluminum-electrolytic capacitors ranging from 2.2 µF to 150 µF, provided ESR is between 50 mΩ and 2.5 Ω. onsemi recommends pairing a 10 µF OSCON for AC stability with a 150 µF OSCON for transient response - both placed as close as possible to the Vout pin.
How does thermal performance scale with PCB copper area for the NCP566ST25T3G?
Thermal resistance (RJA) of the NCP566ST25T3G improves from 107°C/W (no copper) to ~50°C/W with 500 mm² of 1 oz copper - per Figure 19 in the datasheet. The exposed thermal tab (Pin 2/Tab) must be soldered directly to this copper area. Doubling copper thickness to 2 oz further reduces RJA by ~15%, directly extending safe continuous 1.5 A operation.
Is the NCP566ST25T3G pin-compatible with other versions in the NCP566 family?
Yes - all NCP566 variants (e.g., NCP566ST12T3G, NCP566ST18T3G, NCP566ST25T3G) share identical SOT-223 pinout (Vin, GND, Vout), allowing board-level voltage optioning via BOM change only. Output voltage is laser-trimmed during test; no external resistors or configuration pins are involved.
NCP566ST25T3G 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):
- 2.5V
- 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)
NCP566ST25T3G FAQ
1.How can I place an order for NCP566ST25T3G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP566ST25T3G 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 NCP566ST25T3G reliable?
The price and inventory of NCP566ST25T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP566ST25T3G is usually 5 days.
3.What payment methods are accepted for NCP566ST25T3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP566ST25T3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP566ST25T3G?
NCP566ST25T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP566ST25T3G 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 NCP566ST25T3G?
For technical support, including NCP566ST25T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP566ST25T3G requirements.
6.How does Aetrix verify that NCP566ST25T3G is sourced from the original manufacturer or authorized distributors?
All NCP566ST25T3G 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 NCP566ST25T3G meets industry standards.
7.What is the process for return or replacement of NCP566ST25T3G?
All NCP566ST25T3G units undergo pre-shipment inspection (PSI). If there is an issue with NCP566ST25T3G, 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 NCP566ST25T3G part is unused and in its original packaging.
Return procedure for NCP566ST25T3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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