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onsemi NCP1117DT20RKG
- Part No.:
- NCP1117DT20RKG
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
NCP1117DT20RKG.pdf
- Description:
- IC REG LINEAR 2V 1A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,412
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Product details
Overview
NCP1117DT20RKG from onsemi is a 2.0 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 thermal shutdown protection. It delivers stable point-of-load regulation for industrial power rails, hard drive controllers, and switching supply post-regulation stages.
For engineers reviewing the NCP1117DT20RKG datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at full load, thermal performance with PCB copper heatsinking, no-minimum-load operation, and compatibility with standard 10 µF ceramic input/output capacitors.
Technical Context
The NCP1117DT20RKG uses an internal bandgap reference trimmed to ±1.0% and a PNP pass transistor architecture enabling low dropout. Its control loop maintains regulation without minimum load, supporting direct replacement of legacy LM317-based designs in fixed-voltage configurations.
Thermal protection activates at ~175°C junction temperature, and safe operating area compensation prevents secondary breakdown under transient overloads. The device operates across 3.4 V to 12 V input range while sustaining 2.0 V output at up to 1.0 A - constrained only by thermal limits and PCB copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.0 V ±1.0% (guaranteed regulation across 0–800 mA load and −40°C to +125°C) |
| Max Dropout Voltage | 1.20 V at 800 mA (enables operation with Vin as low as 3.2 V while maintaining 2.0 V out) |
| Output Current | 1.0 A continuous (internally current-limited; derated above 125°C ambient) |
| Input Voltage Range | 3.4 V to 12 V (valid for full 0–800 mA load; absolute max 20 V non-operational) |
| Ripple Rejection | 66 dB at 120 Hz (measured with Vin−Vout = 6.4 V, Iout = 500 mA, 10 Vpp input ripple) |
| Quiescent Current | 4.5 mA typical (low bias draw supports efficiency in always-on systems) |
| Thermal Shutdown | Activates at ~175°C junction temperature (prevents catastrophic failure during overload or poor heatsinking) |
Pinout & Package
DPAK (TO-252-3) package with exposed metal tab thermally and electrically connected to Pin 2 (Output). Standard 3-pin configuration optimized for surface-mount PCB heatsinking via large copper pour under tab.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground / Adjust | Reference node for internal error amplifier; connects directly to system ground plane for stability |
| 2 | Output | Main regulated 2.0 V supply rail; tab is internally bonded to this pin for thermal conduction |
| 3 | Input | Unregulated DC input (3.4–12 V); 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 need for dummy load resistors in standby mode |
| ±1.0% output voltage accuracy | Reduces system-level tolerance stack-up; enables tighter margining in 2.0 V logic or analog supply domains |
| 1.2 V max dropout at 800 mA | Permits use with low-headroom sources (e.g., 3.3 V buck converter feeding 2.0 V LDO stage) |
| Integrated thermal shutdown | Self-protecting behavior under sustained overload or inadequate PCB copper; recovers automatically after cooldown |
| Pb-free DPAK package | RoHS-compliant TO-252 footprint compatible with standard reflow profiles and automated assembly |
Applications
| Hard Drive Controllers | Switching Power Supply Post-Regulation |
|---|---|
Use Scenario: Regulating 2.0 V core voltage for SATA controller ASICs requiring tight noise and transient response. IC Role / Device Role / Timing Role: Primary low-noise, low-dropout post-regulator delivering clean 2.0 V rail from intermediate 3.3 V or 5.0 V bus. Use Value: 66 dB ripple rejection and 0.1 V output deviation under 100 mA/µs load transients ensure signal integrity in high-speed serial interfaces. |
Use Scenario: Final-stage regulation after a 5.0 V buck converter powering FPGA I/O banks or microcontroller peripherals. IC Role / Device Role / Timing Role: Fixed-output LDO stabilizing switching converter ripple and compensating for line/load variation. Use Value: 1.2 V dropout allows operation with only 3.2 V input headroom, minimizing power loss and heat generation vs. higher-dropout alternatives. |
| Industrial Point-of-Load Regulation | Battery Chargers (USB-PD / Li-ion) |
Use Scenario: Providing isolated 2.0 V supply for precision ADC reference buffers or sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Local voltage regulator placed adjacent to sensitive analog components to minimize trace impedance effects. Use Value: ±1.0% initial accuracy and 0.5% temperature stability reduce calibration overhead and improve measurement repeatability. |
Use Scenario: Generating 2.0 V bias for charge management ICs or status LED drivers in multi-cell Li-ion chargers. IC Role / Device Role / Timing Role: Auxiliary LDO supplying non-critical subsystems independent of main battery voltage fluctuations. Use Value: No minimum load requirement enables zero-current sleep mode, extending battery runtime in standby 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 |
|---|---|---|---|
| TLV1117-20CDR | 2.0 V fixed, 800 mA max, 1.2 V dropout, SO-8 package (not DPAK); ±2% accuracy | Lower current rating and different footprint; requires PCB redesign and thermal analysis for same power dissipation | Select when SO-8 layout exists and 800 mA suffices; avoid if >1 A or DPAK thermal performance is required. |
| LD1117S20TR | 2.0 V fixed, 800 mA max, 1.3 V dropout, SOT-223 package; ±2% accuracy; no AEC-Q100 variant | SOT-223 has higher RJA than DPAK; unsuitable for >600 mA in compact layouts without extra copper | Choose for cost-sensitive consumer designs where thermal margin is ample and SOT-223 is already used. |
Compared with TLV1117-20CDR and LD1117S20TR, the NCP1117DT20RKG provides higher output current (1.0 A vs. 800 mA), tighter voltage accuracy (±1.0% vs. ±2%), and superior thermal performance in DPAK - making it preferred for industrial and automotive-adjacent applications demanding robustness and long-term stability.
Availability
NCP1117DT20RKG is available at Aetrix Electronics and suitable for industrial automation controllers, hard drive electronics, and switching power supply post-regulation requiring stable component supply, RoHS compliance, and extended temperature support (−40°C to +125°C).
Supply support for NCP1117DT20RKG 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, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The NCP1117 series was designed as a drop-in upgrade to legacy LM317 regulators - delivering improved dropout, tighter accuracy, and integrated protection for reliable point-of-load regulation in cost-sensitive, high-volume applications.
FAQ
What is the maximum input voltage for the NCP1117DT20RKG?
The NCP1117DT20RKG supports an absolute maximum input voltage of 20 V, but its specified operating input range for guaranteed 2.0 V regulation at full 1.0 A load is 3.4 V to 12 V. Exceeding 12 V input reduces safe output current due to thermal constraints, and operation above 20 V risks permanent damage.
Does the NCP1117DT20RKG require an external output capacitor?
Yes, the NCP1117DT20RKG requires a minimum 4.7 µF output capacitor with ESR between 33 mΩ and 2.2 Ω for stability. A 10 µF ceramic or tantalum capacitor is recommended and validated in the datasheet for optimal transient response and ripple suppression across the −40°C to +125°C range.
Is the NCP1117DT20RKG pin-compatible with the LM317?
The NCP1117DT20RKG is not pin-compatible with the LM317 because it is a fixed 2.0 V output device with Input-Ground-Output pinout (Pin 3-1-2), whereas the LM317 is adjustable with Input-Output-Adjust pinout (Pin 3-2-1). However, the NCP1117 series is functionally compatible as a drop-in replacement in fixed-voltage designs using external resistor networks.
What thermal performance can be expected from the NCP1117DT20RKG in DPAK package?
In the DPAK package, the NCP1117DT20RKG achieves a typical junction-to-ambient thermal resistance (RJA) of 67°C/W with minimum PCB copper pad, improving to ~30°C/W with 250 mm² 2-oz copper pour. At 1.0 A and 12 V input, power dissipation reaches ~10 W - requiring adequate copper area or optional heatsink to maintain TJ < 125°C.
Does the NCP1117DT20RKG have automotive qualification?
The NCP1117DT20RKG is not AEC-Q100 qualified. For automotive applications, the pin-compatible NCV1117DT20RKG variant is available - it carries the NCV prefix, is PPAP-capable, and qualified to AEC-Q100 Grade 1 (−40°C to +125°C) with enhanced process controls and traceability.
NCP1117DT20RKG 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):
- 2V
- 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
NCP1117DT20RKG FAQ
1.How can I place an order for NCP1117DT20RKG through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117DT20RKG 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 NCP1117DT20RKG reliable?
The price and inventory of NCP1117DT20RKG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117DT20RKG is usually 5 days.
3.What payment methods are accepted for NCP1117DT20RKG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117DT20RKG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117DT20RKG?
NCP1117DT20RKG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117DT20RKG 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 NCP1117DT20RKG?
For technical support, including NCP1117DT20RKG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117DT20RKG requirements.
6.How does Aetrix verify that NCP1117DT20RKG is sourced from the original manufacturer or authorized distributors?
All NCP1117DT20RKG 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 NCP1117DT20RKG meets industry standards.
7.What is the process for return or replacement of NCP1117DT20RKG?
All NCP1117DT20RKG units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117DT20RKG, 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 NCP1117DT20RKG part is unused and in its original packaging.
Return procedure for NCP1117DT20RKG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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