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onsemi NCP1117DT25T5G
- Part No.:
- NCP1117DT25T5G
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
NCP1117DT25T5G.pdf
- Description:
- IC REG LINEAR 2.5V 1A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,127
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Product details
Overview
NCP1117DT25T5G from onsemi is a 2.5 V fixed-output, 1.0 A low-dropout linear voltage regulator in DPAK (TO-252) package, featuring 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 operates with input voltages up to 20 V and requires no minimum load for regulation - ideal for point-of-load power in industrial controllers and hard drive electronics.
For engineers reviewing the NCP1117DT25T5G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout performance at full load, thermal dissipation capability in DPAK layout, output stability with 4.7 µF–10 µF ceramic output capacitors, and compatibility with legacy LM317-based designs requiring 2.5 V fixed output.
Technical Context
The NCP1117DT25T5G 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 4.7 µF–10 µF output capacitor with ESR between 33 mΩ and 2.2 Ω for stability.
Thermal protection activates at ~175°C junction temperature, cycling output off/on until cooling occurs. The DPAK package's exposed tab (connected to Pin 2) serves as both output terminal and primary thermal path to PCB copper, supporting up to 6.0 W dissipation with optimized heatsinking per Figure 22.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±1.0% (1.5 V to 12 V fixed variants exist; this part is factory-trimmed 2.5 V) |
| Max Output Current | 1.0 A continuous (derated above 12 V input; limited by thermal design) |
| Dropout Voltage | 1.20 V max at 800 mA over temperature (enables regulation with Vin ≥ 3.7 V) |
| Input Voltage Range | 2.9 V to 11.5 V (valid for 2.5 V output; absolute max 20 V) |
| Load Regulation | ≤3.3 mV (0–800 mA load step; ensures stable rail under dynamic CPU/FPGA loads) |
| Ripple Rejection | 64 dB at 120 Hz (Vin−Vout = 6.4 V, Iout = 500 mA; critical for post-regulation of switching supplies) |
| Quiescent Current | 5.2 mA typical (Vin = 10 V; enables low-noise biasing without significant overhead) |
| Thermal Shutdown | Activates at ~175°C junction; hysteresis allows recovery after cooling (not substitute for heatsink design) |
Pinout & Package
DPAK (TO-252) package with exposed metal tab thermally and electrically connected to Pin 2 (Output). Standard 3-pin surface-mount outline (Case 369C), 6.10 mm × 6.54 mm footprint, 2.28 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground / Adjust | Reference node for internal error amplifier; connects to system ground plane; no external resistor needed for fixed-output version |
| 2 | Output | Regulated 2.5 V supply rail; tab is electrically tied to this pin - must be routed to ground plane for thermal management |
| 3 | Input | Unregulated DC input (2.9–11.5 V typical); requires local 10 µF ceramic bypass capacitor within 5 mm |
Key Features
| Feature | Design Value |
|---|---|
| No minimum load requirement | Maintains regulation down to 0 mA output - eliminates dummy load resistors in standby/low-power modes |
| ±1.0% output voltage accuracy | Factory-trimmed bandgap reference enables precise 2.5 V rail for ADC references and logic I/O without external calibration |
| 1.2 V dropout at 800 mA | Enables efficient operation from 3.3 V or 5 V intermediate rails - reduces heat vs. older 2 V+ dropout regulators |
| Integrated protection | Current limit + thermal shutdown + SOA compensation prevent latch-up or destruction during overload or poor heatsinking |
| Pb-free DPAK package | RoHS-compliant TO-252 outline with tin-silver-copper finish; compatible with standard reflow profiles |
Applications
| Industrial Motor Control Boards | Hard Disk Drive Controller Power |
|---|---|
|
Use Scenario: Providing clean 2.5 V bias to FPGA configuration I/O banks and SERDES termination on motor drive PCBs. IC Role / Device Role / Timing Role: Fixed-output LDO delivering stable, low-noise 2.5 V rail independent of main 12 V or 24 V bus fluctuations. Use Value: Eliminates need for external feedback resistors or trimming; ±1.0% tolerance ensures reliable I/O voltage margin across temperature. |
Use Scenario: Regulating 2.5 V for HDD servo processor core logic and interface buffers in 2.5-inch drives. IC Role / Device Role / Timing Role: Point-of-load regulator placed near ASIC to minimize IR drop and noise coupling. Use Value: 1.2 V dropout enables use of 3.3 V intermediate rail, reducing heat vs. higher-dropout alternatives and simplifying thermal layout. |
| Consumer Set-Top Box SoC Power | Automotive Infotainment USB Hub |
|
Use Scenario: Supplying 2.5 V to video decoder ICs and HDMI PHY circuitry in streaming media boxes. IC Role / Device Role / Timing Role: Post-regulator cleaning ripple from upstream DC/DC converter outputs. Use Value: 64 dB ripple rejection at 120 Hz suppresses switching artifacts that cause visible video noise or audio hum. |
Use Scenario: Generating 2.5 V for USB 2.0 transceiver logic in automotive infotainment head units. IC Role / Device Role / Timing Role: Secondary LDO fed from 5 V system rail; must survive load dump and cold crank conditions. Use Value: Operates up to 20 V input and includes thermal shutdown - survives transient overvoltage without external protection. |
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 |
|---|---|---|---|
| TLV1117-25CDR | 2.5 V fixed, 800 mA max, SOT-223 package, 1.2 V dropout, ±2% accuracy | Lower current rating and looser tolerance; smaller thermal mass than DPAK | Select when board space is constrained and 800 mA suffices; verify thermal margin with PCB copper area |
| LD1086V25 | 2.5 V fixed, 1.5 A max, TO-220 package, 1.5 V dropout, ±2% accuracy | Higher current but larger through-hole package; higher dropout increases heat at low Vin | Choose for prototyping or high-current legacy designs where TO-220 mounting is acceptable |
Compared with TLV1117-25CDR and LD1086V25, the NCP1117DT25T5G delivers tighter 2.5 V accuracy (±1.0%), higher 1.0 A current in surface-mount DPAK, and lower dropout - making it optimal for space-constrained, thermally sensitive 2.5 V point-of-load applications.
Availability
NCP1117DT25T5G is available at Aetrix Electronics and suitable for industrial motor control boards, hard disk drive controller power, and consumer set-top box SoC power requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for NCP1117DT25T5G 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 NCP1117 series was designed as a drop-in upgrade to legacy LM317-based circuits, delivering improved dropout, tighter voltage accuracy, and enhanced thermal robustness for fixed-voltage point-of-load regulation in cost-sensitive embedded systems.
FAQ
What is the maximum input voltage for NCP1117DT25T5G?
The NCP1117DT25T5G supports an absolute maximum input voltage of 20 V. However, its recommended operating input range for 2.5 V output is 2.9 V to 11.5 V per the Electrical Characteristics table. Exceeding 12 V input while delivering >1.0 A output violates the safe operating area and may trigger thermal shutdown or reduce reliability.
Does NCP1117DT25T5G require an external capacitor on the adjust pin?
No. The NCP1117DT25T5G is a fixed-output variant - Pin 1 is grounded internally and does not function as an adjust terminal. External capacitors are required only on Input (Pin 3) and Output (Pin 2): 10 µF ceramic input bypass and ≥4.7 µF output capacitor with ESR between 33 mΩ and 2.2 Ω for stability.
Can NCP1117DT25T5G replace LM317 in existing designs?
Yes - the NCP1117DT25T5G is pin-compatible with LM317 in DPAK footprint and provides identical 3-pin topology. However, unlike the adjustable LM317, NCP1117DT25T5G delivers factory-set 2.5 V output, eliminating external resistors. Verify input voltage range and thermal design, as NCP1117DT25T5G has lower dropout and tighter tolerance.
What is the thermal resistance (RJA) of NCP1117DT25T5G in typical PCB layout?
Per Figure 22 in the datasheet, the NCP1117DT25T5G in DPAK achieves RJA ≈ 67 °C/W with minimum-size pad and RJA ≈ 30 °C/W with 2 oz. copper and 25 mm² thermal pad. Actual value depends on PCB copper area, layer count, and airflow. For 1.0 A load at 10 V input, junction temperature rise can exceed 100°C without adequate heatsinking.
Is NCP1117DT25T5G suitable for automotive applications?
The NCP1117DT25T5G is not AEC-Q100 qualified. For automotive use, select the NCV1117DT25RKG variant (marked with "NCV" prefix), which is AEC-Q100 qualified, PPAP-capable, and rated for −40°C to +125°C ambient operation. NCP1117DT25T5G is rated for 0°C to +125°C and intended for industrial/consumer equipment.
NCP1117DT25T5G 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
NCP1117DT25T5G FAQ
1.How can I place an order for NCP1117DT25T5G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117DT25T5G 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 NCP1117DT25T5G reliable?
The price and inventory of NCP1117DT25T5G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117DT25T5G is usually 5 days.
3.What payment methods are accepted for NCP1117DT25T5G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117DT25T5G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117DT25T5G?
NCP1117DT25T5G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117DT25T5G 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 NCP1117DT25T5G?
For technical support, including NCP1117DT25T5G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117DT25T5G requirements.
6.How does Aetrix verify that NCP1117DT25T5G is sourced from the original manufacturer or authorized distributors?
All NCP1117DT25T5G 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 NCP1117DT25T5G meets industry standards.
7.What is the process for return or replacement of NCP1117DT25T5G?
All NCP1117DT25T5G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117DT25T5G, 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 NCP1117DT25T5G part is unused and in its original packaging.
Return procedure for NCP1117DT25T5G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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