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onsemi NCP1117ST25T3
- Part No.:
- NCP1117ST25T3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NCP1117ST25T3.pdf
- Description:
- IC REG LINEAR 2.5V 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:4,469
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Product details
Overview
NCP1117ST25T3 from onsemi is a 2.5 V fixed-output, low-dropout linear voltage regulator in SOT-223 package, delivering up to 1.0 A output current with 1.2 V max dropout at 800 mA and ±1.0% output voltage accuracy. It operates from 3.9 V to 10 V input, requires no minimum load, and integrates thermal shutdown, current limiting, and safe operating area protection-ideal for point-of-load regulation in industrial controllers and hard drive power rails.
For engineers reviewing the NCP1117ST25T3 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at full load, thermal performance with PCB copper heatsinking, line/load regulation specs (≤0.5 mV and ≤3.3 mV respectively), and compatibility with 10 µF ceramic output capacitance for stability.
Technical Context
The NCP1117ST25T3 uses an internal bandgap reference trimmed to ±1.0% and a PNP pass transistor architecture enabling low dropout operation. Its feedback loop is internally compensated, requiring only a single 10 µF output capacitor with ESR between 33 mΩ and 2.2 Ω for stability across temperature and load.
Thermal protection activates at ~175°C junction temperature, and the exposed tab (Pin 2) serves as both output terminal and primary thermal path to PCB copper. Input voltage range (3.9–10 V) and 20 V absolute maximum rating support post-regulation after switching converters or unregulated DC supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5 V ±1.0% - ensures stable logic supply for 2.5 V I/O domains without external trimming. |
| Max Output Current | 1.0 A - sufficient for powering microcontroller cores, FPGAs, or ASICs with burst loads. |
| Dropout Voltage | 1.2 V at 800 mA - enables operation from 3.9 V input while maintaining regulation down to 2.7 V headroom. |
| Line Regulation | 0.5 mV - minimal output shift over full input range, critical for precision analog subsystems. |
| Load Regulation | 3.3 mV - tight output control across 0–800 mA load, reducing need for downstream filtering. |
| Ripple Rejection | 62 dB at 120 Hz - suppresses switching noise from upstream DC/DC converters in hybrid power architectures. |
| Quiescent Current | 5.2 mA - low bias draw preserves efficiency in always-on subsystems like real-time clocks or sensor interfaces. |
Pinout & Package
SOT-223 package (Case 318H) with exposed metal tab thermally and electrically connected to Pin 2 (Output). Standard 3-pin configuration optimized for surface-mount thermal management using PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground | Reference node for internal error amplifier; must be low-impedance connection to minimize ground bounce in high-current paths. |
| 2 | Output | Regulated 2.5 V supply rail; tab connection enables direct thermal coupling to PCB copper for >1 W dissipation. |
| 3 | Input | Unregulated input (3.9–10 V); requires local 10 µF bypass capacitor placed adjacent to pin for transient response and stability. |
Key Features
| Feature | Design Value |
|---|---|
| No minimum load requirement | Enables use in standby modes where load current drops to zero without output voltage drift or instability. |
| Internal thermal shutdown | Protects against sustained overload or inadequate heatsinking by cycling output off/on at ~175°C junction temperature. |
| Current limit + SOA compensation | Prevents destructive second breakdown during short-circuit events, eliminating need for external foldback circuitry. |
| Pb-free SOT-223 package | Complies with RoHS directives and supports lead-free reflow profiles without compromising thermal resistance (RθJA = 160°C/W min pad). |
Applications
| Industrial PLC I/O Modules | Hard Disk Drive Controller Power |
|---|---|
Use Scenario: Providing clean 2.5 V supply to FPGA configuration banks and SERDES transceivers in programmable logic controllers. IC Role / Device Role / Timing Role: Primary point-of-regulation LDO ensuring voltage stability during logic state transitions and partial reconfiguration. Use Value: ±1.0% accuracy and 3.3 mV load regulation prevent bit errors in high-speed data paths under dynamic current demand. | Use Scenario: Powering servo motor drivers and read/write channel ICs in 2.5-inch HDD electronics. IC Role / Device Role / Timing Role: Fixed-output LDO decoupling switched-mode power supply ripple before sensitive analog front-end circuits. Use Value: 62 dB ripple rejection at 120 Hz suppresses low-frequency switching artifacts that cause servo positioning jitter. |
| Consumer Set-Top Box SoC Core Supply | Battery Backup System Regulator |
Use Scenario: Delivering 2.5 V core voltage to media processor SoCs during active video decoding and HDMI transmission. IC Role / Device Role / Timing Role: Low-noise linear regulator supplying power to timing-critical digital blocks adjacent to PLLs and DDR PHYs. Use Value: RMS output noise of 0.003% VOUT minimizes clock jitter accumulation in high-resolution video pipelines. | Use Scenario: Maintaining regulated 2.5 V to real-time clock (RTC) and nonvolatile memory during main power failure. IC Role / Device Role / Timing Role: Always-on LDO powered from backup lithium coin cell or supercapacitor, sustaining timekeeping during AC loss. Use Value: 5.2 mA quiescent current extends battery life beyond 10 years while supporting fast wake-up from deep sleep states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV1117-25CDCYR | 2.5 V fixed, 800 mA max output, 1.2 V dropout at 800 mA, ±2% initial accuracy, SOT-223 package | Lower output current rating and looser voltage tolerance; suitable only for lower-power peripherals | Select when cost sensitivity outweighs need for 1.0 A capability or ±1.0% accuracy. |
| LD1117S25TR | 2.5 V fixed, 800 mA max output, 1.1 V dropout at 800 mA, ±2% accuracy, SOT-223 package | Slightly lower dropout but reduced current and accuracy; lacks automotive-grade variants | Choose for legacy designs already qualified with STMicroelectronics' footprint and qualification profile. |
Compared with TLV1117-25CDCYR and LD1117S25TR, the NCP1117ST25T3 provides higher output current (1.0 A vs. 800 mA), tighter voltage accuracy (±1.0% vs. ±2%), and integrated SOA compensation-making it preferable for industrial and storage applications demanding robust fault handling and long-term stability.
Availability
NCP1117ST25T3 is available at Aetrix Electronics and suitable for industrial automation, storage subsystems, and consumer multimedia equipment requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for NCP1117ST25T3 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, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The NCP1117 series was designed specifically for high-reliability point-of-load regulation in industrial and computing systems where low dropout, tight voltage tolerance, and integrated protection are mandatory-not just for general-purpose voltage conversion.
FAQ
What is the maximum input voltage for the NCP1117ST25T3?
The NCP1117ST25T3 supports a maximum input voltage of 20 V per absolute maximum ratings, but its specified operating input range for 2.5 V output is 3.9 V to 10 V. Exceeding 10 V may increase power dissipation and thermal stress without improving regulation performance.
Does the NCP1117ST25T3 require an external capacitor on the output pin?
Yes, the NCP1117ST25T3 requires a minimum 4.7 µF output capacitor with ESR between 33 mΩ and 2.2 Ω for stability. A 10 µF ceramic capacitor is recommended and validated in the datasheet for optimal transient response and loop stability across temperature.
Can the NCP1117ST25T3 be used in automotive applications?
The standard NCP1117ST25T3 is not AEC-Q100 qualified. For automotive use, the NCV1117ST25T3G variant-identical in electrical specs but qualified to AEC-Q100 Grade 1 (−40°C to +125°C) and PPAP capable-must be selected instead of the NCP1117ST25T3.
What is the thermal resistance of the NCP1117ST25T3 in SOT-223 package?
The NCP1117ST25T3 in SOT-223 (Case 318H) has a typical junction-to-ambient thermal resistance (RθJA) of 160°C/W with minimum PCB pad, and 15°C/W junction-to-case (RθJC). Effective heatsinking requires connecting the exposed tab (Pin 2) to ≥1 in² of 2 oz copper.
Is the NCP1117ST25T3 pin-compatible with older regulators like the LM317?
No-the NCP1117ST25T3 is a fixed-output device with Ground–Output–Input pinout (Pin 1=GND, Pin 2=VOUT, Pin 3=VIN), whereas the adjustable LM317 uses Adjust–Output–Input. However, the NCP1117 series *adjustable* variants (e.g., NCP1117STAT3G) are pin-compatible with LM317 layouts.
NCP1117ST25T3 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):
- 20V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 800mA
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 68dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223
NCP1117ST25T3 FAQ
1.How can I place an order for NCP1117ST25T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117ST25T3 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 NCP1117ST25T3 reliable?
The price and inventory of NCP1117ST25T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117ST25T3 is usually 5 days.
3.What payment methods are accepted for NCP1117ST25T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117ST25T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117ST25T3?
NCP1117ST25T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117ST25T3 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 NCP1117ST25T3?
For technical support, including NCP1117ST25T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117ST25T3 requirements.
6.How does Aetrix verify that NCP1117ST25T3 is sourced from the original manufacturer or authorized distributors?
All NCP1117ST25T3 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 NCP1117ST25T3 meets industry standards.
7.What is the process for return or replacement of NCP1117ST25T3?
All NCP1117ST25T3 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117ST25T3, 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 NCP1117ST25T3 part is unused and in its original packaging.
Return procedure for NCP1117ST25T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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