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onsemi NCP1117DT18G
- Part No.:
- NCP1117DT18G
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
NCP1117DT18G.pdf
- Description:
- IC REG LINEAR 1.8V 1A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,965
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Product details
Overview
NCP1117DT18G 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 over temperature, ±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 hard drive controllers and switching power supply post-regulation.
For engineers reviewing the NCP1117DT18G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at full load, thermal performance in DPAK layout, line/load regulation specs, and compatibility with 10 µF input/output ceramic capacitors without minimum load requirement.
Technical Context
The NCP1117DT18G implements a PNP-based LDO architecture with internal bandgap reference trimmed to ±1.0%, enabling stable 1.8 V output across 0°C to +125°C ambient. Its dropout voltage remains ≤1.20 V at 800 mA and 125°C, supporting operation from inputs as low as 3.2 V (Vin ≥ Vout + 1.4 V).
It features no minimum load requirement for regulation, uses external 10 µF input and output capacitors for stability, and includes internal protection against overcurrent, thermal runaway, and unsafe SOA conditions - all without requiring external diodes under standard operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.800 V ±1.0% (1.782–1.818 V), specified at 10 mA to 800 mA load, no minimum load required |
| Max Dropout Voltage | 1.20 V at 800 mA and 125°C - enables regulation from 3.0 V input in high-temp industrial environments |
| Output Current | 1.0 A continuous (1.5 A peak), limited by thermal design; requires heatsinking above ~0.5 A in still air |
| Line Regulation | 0.4 mV typical (≤0.5 mV max) over Vin = 3.2–11.8 V - ensures stable 1.8 V despite upstream supply variation |
| Load Regulation | 2.6 mV typical (≤3.0 mV max) from 0–800 mA - maintains tight voltage control across dynamic loads |
| Ripple Rejection | 72 dB at 120 Hz (Vin−Vout = 6.4 V, Iout = 500 mA) - suppresses switching noise from upstream DC/DC converters |
| Quiescent Current | 4.2 mA at Vin = 11.8 V - low bias current supports efficient operation in always-on subsystems |
Pinout & Package
DPAK (TO-252-3) package with exposed metal tab thermally and electrically connected to Pin 2 (Output). Standard 3-pin surface-mount configuration optimized for PCB copper-area heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground / Adjust | Reference node for internal error amplifier; tied directly to system ground; no external resistor needed for fixed 1.8 V version |
| 2 | Output | Regulated 1.8 V supply rail; connected to exposed metal tab for thermal conduction and low-impedance return path |
| 3 | Input | Unregulated input (up to 20 V); requires local 10 µF ceramic bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| ±1.0% Output Accuracy | Factory-trimmed reference eliminates need for external calibration in precision 1.8 V logic supply rails |
| No Minimum Load Requirement | Enables stable regulation down to zero load - critical for standby modes in HDD controllers and battery-backed systems |
| Thermal Shutdown Protection | Activates at ~175°C junction temperature, preventing catastrophic failure during transient overload or poor heatsinking |
| Dropout ≤1.2 V at 800 mA | Permits use with 3.3 V or 5 V intermediate rails in multi-stage power architectures without excessive headroom loss |
| Pb-Free DPAK Package | RoHS-compliant TO-252-3 footprint compatible with standard reflow profiles and IPC-7351B land patterns |
Applications
| Consumer Point-of-Regulation | Hard Drive Controller Power |
|---|---|
Use Scenario: Providing clean, stable 1.8 V supply to DDR memory interfaces and SATA PHY circuitry in desktop and NAS storage enclosures. IC Role / Device Role / Timing Role: Primary low-noise linear regulator for memory I/O voltage domain, replacing less accurate 1.8 V LDOs with higher dropout. Use Value: Maintains ±1.0% output accuracy across temperature and load, ensuring signal integrity and timing margin compliance per JEDEC DDR standards. | Use Scenario: Regulating 1.8 V for servo motor drivers and spindle controller ASICs in 2.5″ and 3.5″ HDDs. IC Role / Device Role / Timing Role: Fixed-output LDO supplying core logic and analog front-end circuits with fast transient response to burst current demands. Use Value: Delivers ≤2.6 mV load regulation and 72 dB ripple rejection, minimizing jitter and bit-error rate in high-speed data channels. |
| Switching Supply Post-Regulation | Industrial Sensor Node Power |
Use Scenario: Final-stage regulation after a 5 V or 12 V buck converter in programmable logic controllers and motor drives. IC Role / Device Role / Timing Role: Low-noise post-regulator cleaning switching ripple before feeding FPGA I/O banks or ADC reference supplies. Use Value: Achieves 72 dB ripple rejection at 120 Hz and 60 dB+ above 1 kHz, reducing conducted EMI into sensitive analog sections. | Use Scenario: Powering ultra-low-power microcontrollers and MEMS sensors in battery-operated condition monitoring nodes. IC Role / Device Role / Timing Role: Efficient 1.8 V source with 4.2 mA quiescent current and no minimum load, extending battery life in sleep mode. Use Value: Supports >10-year operation on coin cells by eliminating wasteful minimum load currents common in older LDOs. |
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 | 1.8 V fixed, SOT-223 only; 1.2 V dropout at 800 mA; ±2% initial accuracy; 5 mA IQ | Lower thermal performance due to SOT-223 package; unsuitable for >0.6 A continuous in compact layouts | Select when board space is constrained and thermal budget allows lower current capability. |
| LD1117S18TR | 1.8 V fixed, SOT-223 only; 1.3 V dropout at 800 mA; ±2% accuracy; 5.5 mA IQ; no AEC-Q100 variant | Lacks automotive qualification and tighter accuracy; limited to commercial temp range (0–125°C) | Choose for cost-sensitive consumer designs where AEC-Q100 and ±1.0% are not required. |
Compared with TLV1117-18CDR and LD1117S18TR, the NCP1117DT18G offers superior thermal capability via DPAK, ±1.0% accuracy for precision rails, and guaranteed operation to 125°C ambient - making it preferred for industrial and storage applications demanding reliability and regulation tightness.
Availability
NCP1117DT18G is available at Aetrix Electronics and suitable for hard drive controllers, switching power supply post-regulation, and industrial sensor node power requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for NCP1117DT18G 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, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The NCP1117 series was designed for high-reliability point-of-load regulation in storage, computing, and industrial equipment - emphasizing low dropout, tight accuracy, and robust thermal protection in surface-mount packages.
FAQ
What is the maximum input voltage rating for the NCP1117DT18G?
The NCP1117DT18G supports a maximum input voltage of 20 V, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable 1.8 V output, the recommended input range is 3.2 V to 11.8 V - ensuring sufficient headroom for dropout while maintaining thermal safety at full load.
Does the NCP1117DT18G require an external output capacitor, and what type is recommended?
Yes, the NCP1117DT18G 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 widely used. The datasheet confirms that 10 µF ceramic meets all stability criteria across temperature and load, eliminating need for electrolytic types in most applications.
Is a minimum load current required for regulation with the NCP1117DT18G?
No, the NCP1117DT18G has no minimum load requirement to maintain regulation - a key advantage over legacy regulators. This is explicitly stated in the datasheet for all fixed-output versions, including NCP1117DT18G, enabling stable 1.8 V output even at zero load, which is essential for low-power standby modes.
How does thermal performance differ between the DPAK and SOT-223 packages for the NCP1117DT18G?
The DPAK package (used in NCP1117DT18G) provides significantly better thermal performance than SOT-223: RJA is 67°C/W (min pad) vs. 160°C/W for SOT-223. This allows NCP1117DT18G to sustain ~1.0 A continuously with adequate PCB copper, whereas SOT-223 variants are typically limited to ~0.6 A in similar conditions - verified in Figures 21 and 22 of the datasheet.
Can the NCP1117DT18G be used in automotive applications?
The NCP1117DT18G is not automotive-qualified. For AEC-Q100 compliant designs, use the NCV1117DT18RKG variant instead - it shares identical electrical specs but adds automotive-grade process controls, PPAP capability, and extended −40°C to +125°C operation. The "NCP" prefix denotes commercial/industrial grade only.
NCP1117DT18G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Bulk
- 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
NCP1117DT18G FAQ
1.How can I place an order for NCP1117DT18G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117DT18G 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 NCP1117DT18G reliable?
The price and inventory of NCP1117DT18G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117DT18G is usually 5 days.
3.What payment methods are accepted for NCP1117DT18G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117DT18G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117DT18G?
NCP1117DT18G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117DT18G 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 NCP1117DT18G?
For technical support, including NCP1117DT18G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117DT18G requirements.
6.How does Aetrix verify that NCP1117DT18G is sourced from the original manufacturer or authorized distributors?
All NCP1117DT18G 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 NCP1117DT18G meets industry standards.
7.What is the process for return or replacement of NCP1117DT18G?
All NCP1117DT18G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117DT18G, 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 NCP1117DT18G part is unused and in its original packaging.
Return procedure for NCP1117DT18G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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