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onsemi NCP1117DT18RK
- Part No.:
- NCP1117DT18RK
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
NCP1117DT18RK.pdf
- Description:
- IC REG LINEAR 1.8V 1A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,159
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Product details
Overview
NCP1117DT18RK from onsemi is a 1.8 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 battery chargers where stable 1.8 V supply is required.
For engineers reviewing the NCP1117DT18RK datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at full load, thermal performance in DPAK layout, line/load regulation specs under 800 mA, and compatibility with 10 µF input/output ceramic capacitors.
Technical Context
The NCP1117DT18RK implements a monolithic PNP pass transistor architecture with internal bandgap reference trimmed to ±1.0%, enabling precise 1.8 V output without external resistors. Its dropout behavior is characterized across temperature (−40°C to +125°C) and load (0–800 mA), maintaining regulation down to 1.07 V dropout at 800 mA over temperature.
Protection circuitry includes foldback current limiting activated above ~1.5 A, thermal shutdown triggered at ~175°C junction temperature, and safe operating area compensation to prevent secondary breakdown during transient overload. Input voltage range is specified from 3.2 V to 11.8 V for stable 1.8 V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.800 V ±1.0% (1.782–1.818 V), no minimum load required |
| Max Dropout Voltage | 1.20 V at 800 mA over temperature - enables operation with only 3.0 V input at full load |
| Output Current | 1.0 A continuous - supports high-current digital logic rails and microcontroller cores |
| Line Regulation | 0.4 mV (typ) over 3.2–11.8 V input - ensures <0.025% output change across input range |
| Load Regulation | 2.6 mV (typ) over 0–800 mA - maintains tight voltage control during dynamic load steps |
| Ripple Rejection | 72 dB at 120 Hz - suppresses switching noise from upstream DC/DC converters |
| Quiescent Current | 4.2 mA at 11.8 V input - minimizes no-load power loss in always-on systems |
Pinout & Package
DPAK (TO-252-3) package with exposed metal tab thermally connected to Pin 2 (Output); standard 3-pin configuration optimized for PCB copper heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground / Adjust | Reference node for internal error amplifier; tied directly to system ground for fixed-output operation |
| 2 | Output | Regulated 1.8 V supply; electrically and thermally connected to exposed heatsink tab |
| 3 | Input | Unregulated input (3.2–11.8 V); requires local 10 µF ceramic bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 1.8 V output | Eliminates external resistor network, reducing BOM count and layout sensitivity |
| 1.2 V dropout at 800 mA | Enables use with single-cell Li-ion (3.0–3.6 V) or 3.3 V rail post-regulation |
| ±1.0% output accuracy | Meets tight tolerance requirements for FPGA I/O banks and ARM core supplies |
| Thermal shutdown at ~175°C | Prevents catastrophic failure during sustained overload or inadequate heatsinking |
| No minimum load requirement | Supports ultra-low-power sleep modes without dummy load resistors |
Applications
| Industrial PLC I/O Modules | FPGA Core Power Supply |
|---|---|
Use Scenario: Providing clean 1.8 V bias to analog front-end ADC drivers and digital isolator interfaces in programmable logic controllers. IC Role / Device Role / Timing Role: Point-of-regulation LDO supplying isolated 1.8 V domain with low noise and fast transient response. Use Value: Maintains <2.6 mV load regulation during 0–800 mA step loads, ensuring signal integrity in precision measurement circuits. | Use Scenario: Delivering stable 1.8 V to FPGA transceiver banks requiring tight voltage tolerance and low ripple. IC Role / Device Role / Timing Role: Fixed-output LDO decoupling high-speed serial I/O power domains from noisy system rails. Use Value: 72 dB ripple rejection at 120 Hz suppresses switching noise from adjacent DC/DC converters, preventing bit errors. |
| Battery Charger Control Logic | Automotive Infotainment MCU Core |
Use Scenario: Powering microcontroller and display driver ICs in portable battery charging stations with variable input from USB PD or wall adapters. IC Role / Device Role / Timing Role: Primary 1.8 V regulator for charge management firmware execution and status LED control logic. Use Value: Operates down to 3.2 V input, allowing direct connection to 3.3 V intermediate bus without additional buck stage. | Use Scenario: Supplying 1.8 V core voltage to automotive-grade MCUs in infotainment head units operating across −40°C to +125°C ambient. IC Role / Device Role / Timing Role: High-reliability LDO meeting AEC-Q100 stress requirements for safety-critical subsystems. Use Value: NCP1117I/NCV1117 variants qualified to AEC-Q100; this NCP1117DT18RK shares identical electrical specs and thermal 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 |
|---|---|---|---|
| TLV1117-18CDR | 1.0 A rated, 1.2 V dropout at 800 mA, but ±2% output accuracy vs. ±1.0% for NCP1117DT18RK | Lower accuracy limits use in precision analog or high-speed digital rails | Select when cost sensitivity outweighs need for ±1.0% regulation tolerance |
| LD1117S18TR | 800 mA max output current, 1.3 V dropout at 800 mA, SOT-223 package only | Limited current headroom and higher dropout reduce margin in thermally constrained designs | Choose only if DPAK footprint is unavailable and peak load stays below 800 mA |
Compared with TLV1117-18CDR and LD1117S18TR, the NCP1117DT18RK provides superior output accuracy (±1.0% vs. ±2% or ±2.5%), higher guaranteed current (1.0 A vs. 800 mA), and lower dropout-enabling tighter input voltage margins and improved thermal headroom in DPAK layouts.
Availability
NCP1117DT18RK is available at Aetrix Electronics and suitable for industrial automation, battery-powered test equipment, and automotive infotainment systems requiring stable component supply with long-term manufacturability and Pb-free compliance.
Supply support for NCP1117DT18RK 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, and cloud infrastructure markets.
The NCP1117 series was designed as a drop-in replacement for legacy LM317-based regulators, targeting high-current, low-dropout point-of-load applications in consumer, industrial, and automotive electronics with enhanced thermal robustness and tighter voltage accuracy.
FAQ
What is the maximum input voltage rating for the NCP1117DT18RK?
The NCP1117DT18RK supports an absolute maximum input voltage of 20 V, but its specified operating input range for stable 1.8 V output is 3.2 V to 11.8 V. Exceeding 11.8 V increases dropout losses and thermal stress without improving regulation performance.
Does the NCP1117DT18RK require an external capacitor on the adjust pin?
No - the NCP1117DT18RK is a fixed-output variant; the adjust pin (Pin 1) is internally connected and functions solely as ground. External capacitors on this pin are unnecessary and not recommended per the datasheet.
Can the NCP1117DT18RK be used in automotive applications?
The NCP1117DT18RK itself is not AEC-Q100 qualified, but the functionally identical NCV1117DT18RKG and NCP1117I variants are automotive-grade. Designers may use NCP1117DT18RK in non-safety-critical automotive subsystems where qualification is not mandated.
What thermal performance can be expected from the NCP1117DT18RK in a standard DPAK layout?
In a typical 2.0 oz copper PCB with 25 mm² copper pad, the NCP1117DT18RK achieves RJA ≈ 67°C/W. At 1.0 A load with 5 V input, power dissipation is ~3.2 W, resulting in ~215°C rise - requiring either reduced load, forced air, or larger copper area to stay within 150°C max junction temperature.
Is the NCP1117DT18RK pin-compatible with the LM317?
Yes - the NCP1117DT18RK uses the same 3-pin DPAK pinout (Input, Output, Ground) as the LM317, enabling direct mechanical replacement. However, unlike the LM317, it delivers fixed 1.8 V without external resistors and features improved dropout and accuracy.
NCP1117DT18RK 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):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 800mA
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 70dB (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
NCP1117DT18RK FAQ
1.How can I place an order for NCP1117DT18RK through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117DT18RK 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 NCP1117DT18RK reliable?
The price and inventory of NCP1117DT18RK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117DT18RK is usually 5 days.
3.What payment methods are accepted for NCP1117DT18RK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117DT18RK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117DT18RK?
NCP1117DT18RK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117DT18RK 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 NCP1117DT18RK?
For technical support, including NCP1117DT18RK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117DT18RK requirements.
6.How does Aetrix verify that NCP1117DT18RK is sourced from the original manufacturer or authorized distributors?
All NCP1117DT18RK 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 NCP1117DT18RK meets industry standards.
7.What is the process for return or replacement of NCP1117DT18RK?
All NCP1117DT18RK units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117DT18RK, 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 NCP1117DT18RK part is unused and in its original packaging.
Return procedure for NCP1117DT18RK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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