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onsemi NCP566ST12T3G
- Part No.:
- NCP566ST12T3G
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NCP566ST12T3G.pdf
- Description:
- IC REG LINEAR 1.2V 1.5A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:3,892
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Product details
Overview
NCP566ST12T3G from onsemi is a fixed-output 1.2 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 NCP566ST12T3G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal behavior, stability conditions with ceramic/tantalum capacitors, and real-world load transient performance data from onsemi's evaluation board testing.
Technical Context
The NCP566ST12T3G implements a voltage-reference-based feedback loop with internal 0.9 V reference and precision resistor divider to deliver stable 1.2 V ±2% over −10°C to +105°C and ±3% over −40°C to +125°C. Its fast-loop architecture enables sub-microsecond recovery from 10 mA ↔ 1.5 A load steps.
It integrates current-limit protection (1.6–3.5 A), thermal shutdown at 160°C, and short-circuit foldback-no external components required. Ground current remains tightly regulated at 1.5 mA typical at 1.5 A output, enabling high efficiency in battery-sensitive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.2 V ±2% (−10°C to +105°C); ensures stable core voltage for ASICs and microprocessors without external trimming |
| Dropout Voltage | 0.9 V max at 1.5 A; allows operation from 2.1 V input, supporting single-cell Li-ion or 3.3 V rail post-regulation |
| Output Noise | 37 µVrms (100 Hz–100 kHz); low enough for noise-sensitive analog circuitry powered from same rail |
| Ripple Rejection | 85 dB @ 120 Hz; suppresses switching noise from upstream DC/DC converters feeding the LDO input |
| Ground Current | 1.5 mA typical @ 1.5 A load; minimizes quiescent power loss in always-on subsystems |
| Thermal Shutdown | 160°C junction temperature; protects against sustained overload or inadequate heatsinking in enclosed environments |
| Stable Capacitor Range | 2.2 µF–150 µF with ESR 50 mΩ–2.5 Ω; compatible with low-ESR ceramic, tantalum, and aluminum-electrolytic types |
Pinout & Package
SOT-223 (Case 318E) package with exposed thermal tab (Pin 2 and Tab connected to 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 Power Supply Input | Accepts 2.8 V–9.0 V input; must be decoupled with ≥4.7 µF capacitor placed adjacent to pin |
| 2 & Tab (GND) | Power Ground Reference | Primary thermal and electrical return path; tab soldered to PCB ground plane for thermal conduction |
| 3 (Vout) | Regulated Output | Delivers 1.2 V ±2% at up to 1.5 A; requires output capacitor placed within 5 mm of pin for optimal transient response |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Fast Load Transient Response | Sub-µs recovery from 10 mA ↔ 1.5 A step; maintains <±50 mV output deviation with 10 µF + 150 µF output network |
| Low Dropout at Full Load | 0.9 V dropout enables use with 2.1 V minimum input-critical for battery-powered systems near end-of-discharge |
| Low-Noise Regulation | 37 µVrms noise supports mixed-signal SoCs where clean 1.2 V supply prevents ADC/DAC performance degradation |
| Integrated Protection | Current limit (1.6–3.5 A), thermal shutdown (160°C), and short-circuit foldback eliminate need for external fault management circuitry |
| Pb-Free & RoHS Compliant | SOT-223 package meets J-STD-609 Class 2 moisture sensitivity level (MSL3) and IPC/JEDEC J-STD-020 reflow profile |
Applications
| ASIC Power Supplies | Post-Regulation for Switching Supplies |
|---|---|
|
Use Scenario: Providing clean, low-noise 1.2 V core voltage to high-speed ASICs in networking switches and baseband processors. IC Role / Device Role / Timing Role: Final-stage voltage regulation delivering precise, ripple-free power to sensitive logic cores. Use Value: 85 dB ripple rejection at 120 Hz prevents upstream DC/DC switching artifacts from corrupting ASIC timing margins. |
Use Scenario: Tightening output tolerance and suppressing residual ripple after a primary buck converter in server VRMs. IC Role / Device Role / Timing Role: Precision post-regulator ensuring stable 1.2 V under dynamic CPU load transients. Use Value: Ultra-fast transient response limits output droop to <±40 mV during 1.5 A load steps-preserving processor stability. |
| LCD Monitor Power Rails | Medical Imaging Signal Chain |
|
Use Scenario: Generating stable 1.2 V bias for timing controllers and display interface ICs in industrial LCD panels. IC Role / Device Role / Timing Role: Low-noise local regulator powering LVDS transmitter PLLs and gamma correction DACs. Use Value: 37 µVrms noise prevents visible banding or flicker in high-resolution displays driven by analog pixel drivers. |
Use Scenario: Supplying 1.2 V to precision ADC front-ends and FPGA configuration logic in portable ultrasound units. IC Role / Device Role / Timing Role: Medical-grade low-noise regulator meeting IEC 60601-1 leakage and reliability requirements. Use Value: Thermal shutdown at 160°C and −40°C to +125°C operating range ensure safe, continuous operation in clinical environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A4700RGWR | 1.2 V, 1 A, 20 µVrms noise, 25 µA quiescent current; higher PSRR (≥90 dB), lower output current rating | Better suited for ultra-low-noise analog signal chains but insufficient for 1.5 A digital loads | Select when noise <25 µVrms is mandatory and load ≤1 A; not drop-in for NCP566ST12T3G's 1.5 A requirement |
| MCP1826T-1202E/DB | 1.2 V, 1.5 A, 0.6 V dropout, 60 µVrms noise, SOT-223; lacks thermal shutdown and has higher ground current (4 mA @ 1.5 A) | Acceptable for cost-sensitive industrial controls where thermal margin is ample and noise <50 µVrms is acceptable | Choose for lower dropout in 2.0 V input systems; verify thermal design due to missing thermal shutdown |
Compared with TPS7A4700RGWR and MCP1826T-1202E/DB, the NCP566ST12T3G uniquely balances 1.5 A capability, 0.9 V dropout, 37 µVrms noise, and integrated thermal/current protection-making it the only option among the three qualified for high-current, safety-critical post-regulation in servers and medical devices.
Availability
NCP566ST12T3G is available at Aetrix Electronics and suitable for ASIC power supplies, post-regulation for switching supplies, and LCD monitor power rails requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for NCP566ST12T3G 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, sensing, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The NCP566ST12T3G belongs to onsemi's NCP566 family of high-current LDOs designed specifically for post-regulation in high-performance digital systems where fast transient response, low noise, and robust protection are non-negotiable.
FAQ
What is the maximum input voltage for the NCP566ST12T3G?
The NCP566ST12T3G supports a maximum input voltage of 9.0 V, as specified in its Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. For reliable 1.2 V output, the input must remain ≥2.1 V (1.2 V + 0.9 V dropout) across all load and temperature conditions-ensuring compatibility with 3.3 V or 5 V intermediate rails.
Does the NCP566ST12T3G require external capacitors, and what values are recommended?
Yes, the NCP566ST12T3G requires both input and output capacitors for stability and transient performance. An input capacitor of 4.7 µF–150 µF (low-ESR ceramic preferred) is recommended, while the output capacitor must be 2.2 µF–150 µF with ESR between 50 mΩ and 2.5 Ω. onsemi's evaluation board uses a 10 µF + 150 µF parallel network for optimal AC stability and load transient response.
How does the thermal shutdown feature operate in the NCP566ST12T3G?
The NCP566ST12T3G activates thermal shutdown at approximately 160°C junction temperature, disabling the output until the die cools below the hysteresis threshold (~140°C). This protects against catastrophic failure during sustained overload or inadequate PCB heatsinking. The device's RJA of 107°C/W assumes a 50 mm² copper area-reducing thermal resistance via larger copper pours improves sustained current capability.
Is the NCP566ST12T3G pin-compatible with other versions in the NCP566 family?
Yes, all NCP566 variants-including NCP566ST18T3G (1.8 V) and NCP566ST25T3G (2.5 V)-share identical SOT-223 pinout (Vin, GND, Vout) and package footprint. This allows voltage-scaling flexibility within the same PCB layout, provided input voltage and capacitor selection meet each version's minimum Vin requirements (e.g., ≥3.4 V for 1.8 V output).
What is the load regulation specification for the NCP566ST12T3G, and why does it matter?
The NCP566ST12T3G exhibits 0.04% load regulation (10 mA to 1.5 A), meaning output voltage changes by only ±0.48 mV across full load. This tight regulation ensures consistent logic-level margins for 1.2 V-core digital ICs-even during rapid CPU load transitions-preventing timing violations or unexpected resets in mission-critical systems like networking equipment and medical imaging.
NCP566ST12T3G 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):
- 1.2V
- 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)
NCP566ST12T3G FAQ
1.How can I place an order for NCP566ST12T3G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP566ST12T3G 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 NCP566ST12T3G reliable?
The price and inventory of NCP566ST12T3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP566ST12T3G is usually 5 days.
3.What payment methods are accepted for NCP566ST12T3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP566ST12T3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP566ST12T3G?
NCP566ST12T3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP566ST12T3G 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 NCP566ST12T3G?
For technical support, including NCP566ST12T3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP566ST12T3G requirements.
6.How does Aetrix verify that NCP566ST12T3G is sourced from the original manufacturer or authorized distributors?
All NCP566ST12T3G 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 NCP566ST12T3G meets industry standards.
7.What is the process for return or replacement of NCP566ST12T3G?
All NCP566ST12T3G units undergo pre-shipment inspection (PSI). If there is an issue with NCP566ST12T3G, 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 NCP566ST12T3G part is unused and in its original packaging.
Return procedure for NCP566ST12T3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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