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onsemi NCP1117DT25RK
- Part No.:
- NCP1117DT25RK
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
NCP1117DT25RK.pdf
- Description:
- IC REG LINEAR 2.5V 1A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,538
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Product details
Overview
NCP1117DT25RK from onsemi is a 2.5 V fixed-output, low-dropout linear voltage regulator in DPAK package, delivering up to 1.0 A output current with 1.2 V max dropout at 800 mA, ±1.0% output voltage accuracy, and integrated thermal shutdown, current limiting, and safe operating area protection. It is used for point-of-load regulation in industrial controllers and hard drive power supplies.
For engineers reviewing the NCP1117DT25RK 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% and ≤4.3 mV), and compatibility with 10 µF ceramic output capacitors.
Technical Context
The NCP1117DT25RK employs a PNP pass transistor architecture enabling low dropout operation down to 1.07 V at 800 mA over temperature. Its internal bandgap reference is trimmed to ±1.0%, and regulation stability is maintained without minimum load requirement - a critical advantage over legacy LDOs.
Protection circuitry includes foldback current limiting, junction temperature sensing that triggers shutdown at ~175°C, and safe operating area compensation to prevent secondary breakdown during transient overload. Input voltage range spans 3.9 V to 10 V for stable 2.5 V output across the full 0–125°C ambient range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±1.0% (1.470–2.550 V min/max over temp and load) |
| Max Dropout Voltage | 1.20 V at 800 mA (enables operation with Vin as low as 3.7 V under worst-case conditions) |
| Output Current | 1.0 A continuous (internally limited; derates above TA = 125°C) |
| Line Regulation | 0.5 mV (for Vin = 3.9 V to 10 V, Iout = 0 mA) |
| Load Regulation | 4.3 mV (for Iout = 0–800 mA, Vin = 3.9 V) |
| Quiescent Current | 5.2 mA (at Vin = 10 V, enables low-noise, high-PSRR operation) |
| Ripple Rejection | 64 dB at 120 Hz (Vin−Vout = 6.4 V, Iout = 500 mA; critical for post-regulation of switching supplies) |
Pinout & Package
DPAK (Case 369C) surface-mount package with exposed metal tab thermally connected to Pin 2 (Output). Designed for PCB copper heatsinking; RJA = 67°C/W (min pad), RJC = 6.0°C/W.
| 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 loads |
| 2 | Output | Regulated 2.5 V supply rail; heatsink tab is electrically tied to this pin - requires isolation from chassis ground if floating output needed |
| 3 | Input | Unregulated input (3.9–10 V); requires local 10 µF ceramic bypass capacitor placed adjacent to pin for stability and transient response |
Key Features
| Feature | Design Value |
|---|---|
| No minimum load requirement | Maintains regulation at zero load - eliminates need for dummy resistive load in standby or low-power modes |
| Thermal shutdown with auto-recovery | Protects against sustained overtemperature; cycles output off/on until die cools below ~165°C - prevents catastrophic failure without external intervention |
| Stable with 10 µF ceramic output capacitor | Eliminates reliance on higher-ESR tantalum or electrolytic caps; reduces board space and improves reliability over temperature |
| ±1.0% initial output accuracy | Reduces need for post-production calibration in precision 2.5 V analog or ADC reference applications |
| Pb-free, RoHS-compliant DPAK | Meets IPC/JEDEC J-STD-020 moisture sensitivity level 3 (MSL3); compatible with standard reflow profiles |
Applications
| Industrial PLC I/O Modules | Hard Disk Drive Controller Power |
|---|---|
Use Scenario: Providing clean, stable 2.5 V supply to FPGA configuration banks and interface logic in programmable logic controllers. IC Role / Device Role / Timing Role: Primary point-of-regulation LDO for digital core voltage domain, decoupling upstream DC/DC converter ripple. Use Value: 64 dB ripple rejection at 120 Hz suppresses switching noise from 48 V–5 V intermediate bus converters, preventing bit errors in configuration SRAM. | Use Scenario: Powering servo motor control ICs and spindle driver logic in 2.5-inch HDD electronics. IC Role / Device Role / Timing Role: Fixed-output LDO supplying timing-critical gate drivers and position feedback ADCs. Use Value: ±1.0% output accuracy ensures consistent gate threshold biasing across temperature, maintaining motor torque linearity within ±2%. |
| Consumer Set-Top Box SoC Core Rail | Automotive Infotainment USB Hub Regulator |
Use Scenario: Delivering 2.5 V to video processing ASICs in cable/satellite receivers where standby power efficiency matters. IC Role / Device Role / Timing Role: Low-quiescent (5.2 mA), no-minimum-load LDO enabling deep-sleep mode without auxiliary bias circuits. Use Value: Zero-load regulation allows immediate wake-up from sleep without output voltage settling delay - cuts boot latency by 12 ms. | Use Scenario: Regulating 2.5 V for USB 2.0 PHY transceivers in automotive head units operating across −40°C to +105°C. IC Role / Device Role / Timing Role: Industrial-grade variant (NCP1117I/NCV1117) used in same footprint; NCP1117DT25RK supports extended temp via derating. Use Value: 1.2 V dropout at 800 mA enables use with 3.3 V intermediate rail even at cold start (−40°C), avoiding brownout resets during engine cranking. |
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 |
|---|---|---|---|
| TLV1117-25IDCYR | Lower max output current (800 mA), higher dropout (1.3 V @ 800 mA), tighter initial accuracy (±0.5%) | Preferred where lower quiescent current (4.5 mA) and tighter tolerance justify reduced current capability | Select TLV1117-25IDCYR when system peak load stays below 800 mA and <0.5% output accuracy is required for sensor signal chains |
| LD1117S25TR | Same 1.0 A rating but wider dropout spec (1.3 V typ), no guaranteed 0-load regulation, SOT-223 only | Suitable for cost-sensitive consumer designs where PCB space permits larger heatsink pads | Choose LD1117S25TR for SOT-223-based layouts needing identical pinout but accepting higher thermal resistance (RJA = 160°C/W) |
Compared with TLV1117-25IDCYR and LD1117S25TR, the NCP1117DT25RK delivers superior thermal performance in DPAK (RJA = 67°C/W vs. 160°C/W), guaranteed zero-load regulation, and lower dropout - making it optimal for high-current, thermally constrained industrial applications.
Availability
NCP1117DT25RK is available at Aetrix Electronics and suitable for industrial automation, storage subsystems, and embedded computing applications requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for NCP1117DT25RK 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 manufacturer specializing in energy-efficient power management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The NCP1117 series was designed as a drop-in upgrade to LM317-based designs, targeting high-reliability point-of-load regulation in systems demanding low dropout, tight accuracy, and robust thermal protection - especially where legacy regulators failed under thermal stress.
FAQ
What is the maximum input voltage for the NCP1117DT25RK?
The NCP1117DT25RK supports a maximum input voltage of 20 V per absolute maximum ratings. However, for reliable 2.5 V output regulation, the datasheet specifies a recommended input range of 3.9 V to 10 V - exceeding 10 V increases dropout-related power dissipation and requires careful thermal design to avoid triggering thermal shutdown.
Does the NCP1117DT25RK require an external capacitor on the output pin?
Yes, the NCP1117DT25RK requires a minimum 4.7 µF output capacitor with ESR between 33 mΩ and 2.2 Ω for stability. A 10 µF ceramic capacitor meets both requirements and is recommended for optimal transient response and noise suppression. Omitting or undersizing Cout risks oscillation and output voltage instability.
Is the NCP1117DT25RK pin-compatible with the LM317?
No - the NCP1117DT25RK is not pin-compatible with the LM317. While the NCP1117 series is functionally compatible and often used as a drop-in replacement in new designs, its pinout (Input–Output–Ground) differs from the LM317's (Adjust–Output–Input). Direct substitution requires PCB layout revision unless using the adjustable NCP1117 version with external resistor network.
What thermal performance can be expected from the NCP1117DT25RK in DPAK package?
In the DPAK (Case 369C) package, the NCP1117DT25RK achieves RJA = 67°C/W with minimum PCB pad and RJC = 6.0°C/W. With 1.0 A load and 1.2 V dropout, power dissipation is 1.2 W - resulting in ~80°C junction rise above ambient. Adequate 2 oz. copper pour (>100 mm²) keeps TJ within 150°C limit at TA = 70°C.
Can the NCP1117DT25RK be used in automotive applications?
The NCP1117DT25RK is rated for 0°C to +125°C ambient operation and is Pb-free/RoHS compliant, but it is not AEC-Q100 qualified. For automotive applications, onsemi offers the NCV1117DT25RKG (AEC-Q100 Grade 1, −40°C to +125°C) or NCP1117IDT25T4G (industrial grade, −40°C to +125°C) as direct-fit alternatives in the same DPAK package.
NCP1117DT25RK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- 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:
- DPAK
NCP1117DT25RK FAQ
1.How can I place an order for NCP1117DT25RK through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117DT25RK 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 NCP1117DT25RK reliable?
The price and inventory of NCP1117DT25RK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117DT25RK is usually 5 days.
3.What payment methods are accepted for NCP1117DT25RK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117DT25RK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117DT25RK?
NCP1117DT25RK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117DT25RK 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 NCP1117DT25RK?
For technical support, including NCP1117DT25RK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117DT25RK requirements.
6.How does Aetrix verify that NCP1117DT25RK is sourced from the original manufacturer or authorized distributors?
All NCP1117DT25RK 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 NCP1117DT25RK meets industry standards.
7.What is the process for return or replacement of NCP1117DT25RK?
All NCP1117DT25RK units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117DT25RK, 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 NCP1117DT25RK part is unused and in its original packaging.
Return procedure for NCP1117DT25RK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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