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onsemi NCP1117ST18T3
- Part No.:
- NCP1117ST18T3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NCP1117ST18T3.pdf
- Description:
- IC REG LINEAR 1.8V 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:3,249
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Product details
Overview
NCP1117ST18T3 from onsemi is a 1.8 V fixed-output, low-dropout linear voltage regulator in SOT-223 package, delivering up to 1.0 A output current with 1.2 V max dropout at 800 mA and ±1.0% output voltage accuracy over temperature. It operates from 2.9 V to 11.8 V input, requires no minimum load, and integrates thermal shutdown, current limiting, and safe operating area protection - ideal for point-of-load regulation in industrial controllers and embedded power rails.
For engineers reviewing the NCP1117ST18T3 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 mV and ≤4.3 mV respectively), and compatibility with 10 µF ceramic input/output capacitors for stability.
Technical Context
The NCP1117ST18T3 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 10 µF output capacitor with ESR between 33 mΩ and 2.2 Ω for stability across temperature and load.
Thermal protection activates at ~175°C junction temperature, and the exposed tab (Pin 2) serves as both output terminal and primary thermal path to PCB copper. Input voltage range (2.9–11.8 V) and absence of minimum load requirement simplify design in battery-powered and post-regulation applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.8 V ±1.0% (25°C); maintains regulation from 0 mA to 800 mA load without minimum load requirement |
| Max Dropout Voltage | 1.2 V at 800 mA (over temperature); enables operation with Vin as low as 3.0 V under full load |
| Output Current | 1.0 A continuous (limited to 1.0 A when Vin > 12 V); supports high-current microcontroller or FPGA core rails |
| Line Regulation | 0.5 mV (max) over Vin = 3.2–11.8 V; ensures stable output despite input ripple or supply sag |
| Load Regulation | 4.3 mV (max) over 0–800 mA; minimizes voltage shift during processor burst 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 (typ) at Vin = 11.8 V; enables efficient operation in always-on subsystems |
Pinout & Package
SOT-223 package (Case 318H) with exposed metal tab thermally and electrically connected to Pin 2 (Output). Standard 3-pin configuration optimized for surface-mount thermal management using PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground / Adjust (for adjustable variants) | Reference node for internal error amplifier; tied directly to system ground plane for optimal noise immunity and regulation accuracy |
| 2 | Output | Main regulated 1.8 V output; also connects to exposed heatsink tab - must be routed to large copper area for thermal dissipation |
| 3 | Input | Unregulated input (2.9–11.8 V); requires local 10 µF ceramic bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| No minimum load requirement | Enables stable 1.8 V regulation down to 0 mA - eliminates need for wasteful bleed resistors in low-power sleep modes |
| ±1.0% output voltage accuracy | Reduces margining overhead in precision analog or ADC reference supply designs |
| Thermal shutdown + current limit | Prevents catastrophic failure during short-circuit or overload; auto-recovery allows fault-tolerant operation |
| Pb-free SOT-223 package | Complies with RoHS and JEDEC moisture sensitivity level 3 (MSL3) for standard reflow assembly |
| 1.2 V dropout at 800 mA | Permits use with single-cell Li-ion (3.0–4.2 V) or 3.3 V rail as input source for 1.8 V logic |
Applications
| Industrial PLC I/O Modules | Embedded Microcontroller Core Rails |
|---|---|
Use Scenario: Powering isolated digital I/O channels in programmable logic controllers where 1.8 V supplies interface with FPGAs or level-shifted sensors. IC Role / Device Role / Timing Role: Primary low-noise, low-dropout LDO delivering clean 1.8 V to FPGA transceivers and GPIO banks. Use Value: 72 dB ripple rejection suppresses noise from shared 3.3 V switching supplies, ensuring signal integrity in high-speed digital interfaces. | Use Scenario: Supplying core voltage to ARM Cortex-M7 or RISC-V SoCs operating at 1.8 V in battery-backed edge nodes. IC Role / Device Role / Timing Role: Point-of-load regulator providing stable 1.8 V to processor core, decoupled from noisy system rails. Use Value: No minimum load requirement enables zero-power sleep states; 1.2 V dropout extends usable battery life in single-cell Li-ion systems. |
| Hard Disk Drive Controller Boards | Consumer Audio DSP Power Rails |
Use Scenario: Regulating 1.8 V for SATA controller ASICs and buffer memory on HDD mainboards. IC Role / Device Role / Timing Role: Fixed-output LDO replacing older LM1117 variants with tighter tolerance and improved thermal response. Use Value: ±1.0% accuracy reduces timing jitter in high-speed serial links; thermal shutdown prevents damage during enclosure overheating events. | Use Scenario: Powering 1.8 V analog front-end and sigma-delta modulator stages in portable Bluetooth speakers. IC Role / Device Role / Timing Role: Low-noise linear regulator supplying critical audio signal chain components. Use Value: RMS output noise of 0.003% Vout minimizes audible hiss; 4.2 mA quiescent current preserves battery runtime during playback pauses. |
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 |
|---|---|---|---|
| MIC29152-1.8WT | Higher dropout (1.5 V @ 1.5 A), higher quiescent current (15 mA), TO-220 package | Better suited for high-temperature environments (>125°C ambient) due to higher thermal mass | Select when board-level heatsinking is impractical and thermal derating above 100°C is required |
| TLV73318PDBVR | Lower Iout (300 mA), lower dropout (225 mV @ 300 mA), smaller SOT-23-5 package | Optimized for space-constrained, ultra-low-power IoT sensor nodes - not suitable for 1 A loads | Select only for sub-300 mA applications where PCB area is premium and dropout < 0.3 V is mandatory |
Compared with MIC29152-1.8WT and TLV73318PDBVR, the NCP1117ST18T3 uniquely balances 1.0 A capability, 1.2 V dropout, ±1.0% accuracy, and SOT-223 thermal performance - making it the preferred choice for industrial and storage applications demanding robustness and precision at moderate cost.
Availability
NCP1117ST18T3 is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and consumer audio equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for NCP1117ST18T3 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, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The NCP1117 series was designed specifically for high-reliability, low-dropout point-of-load regulation in industrial control, storage, and consumer electronics - emphasizing thermal robustness, output accuracy, and ease of integration without external compensation.
FAQ
What is the maximum input voltage for the NCP1117ST18T3?
The NCP1117ST18T3 supports a maximum input voltage of 11.8 V under full-load conditions (0–800 mA), and up to 20 V absolute maximum rating per datasheet - but operation above 11.8 V is restricted to light loads (<100 mA) to avoid exceeding thermal limits. For reliable 1.0 A operation, Vin must remain ≤11.8 V.
Does the NCP1117ST18T3 require an output capacitor, and what type is recommended?
Yes, the NCP1117ST18T3 requires a minimum 4.7 µF output capacitor with ESR between 33 mΩ and 2.2 Ω for stability. A 10 µF X7R ceramic capacitor is recommended for most applications, as confirmed in the datasheet's Figure 12 and Application Information section. Tantalum or aluminum electrolytic types are acceptable if ESR and capacitance meet specifications across temperature.
Can the NCP1117ST18T3 be used in automotive applications?
The NCP1117ST18T3 is not AEC-Q100 qualified. For automotive use, select the NCV1117ST18T3G variant instead, which carries the NCV prefix, undergoes automotive-grade qualification, and supports −40°C to +125°C operation with PPAP documentation. The NCP1117ST18T3 is rated for 0°C to +125°C ambient and intended for industrial and commercial applications.
How does thermal performance of the NCP1117ST18T3 depend on PCB layout?
Thermal resistance (RJA) of the NCP1117ST18T3 drops from 160°C/W (minimum pad) to ~60°C/W with 2 oz. copper and ≥25 mm² exposed pad area, per Figure 21. Since the heatsink tab is electrically connected to Pin 2 (Output), the copper pour must be tied to the 1.8 V net and sized to dissipate up to 1.5 W at 50°C ambient - improper layout causes premature thermal shutdown.
Is the NCP1117ST18T3 pin-compatible with older regulators like the LM1117?
Yes, the NCP1117ST18T3 is pin-compatible with the LM1117-1.8 in SOT-223 package and offers improved specifications: lower dropout (1.2 V vs. 1.3 V), tighter output accuracy (±1.0% vs. ±2.0%), and enhanced ripple rejection (72 dB vs. ~60 dB). No PCB changes are needed for drop-in replacement in existing LM1117-1.8 designs.
NCP1117ST18T3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- 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:
- SOT-223
NCP1117ST18T3 FAQ
1.How can I place an order for NCP1117ST18T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117ST18T3 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 NCP1117ST18T3 reliable?
The price and inventory of NCP1117ST18T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117ST18T3 is usually 5 days.
3.What payment methods are accepted for NCP1117ST18T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117ST18T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117ST18T3?
NCP1117ST18T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117ST18T3 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 NCP1117ST18T3?
For technical support, including NCP1117ST18T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117ST18T3 requirements.
6.How does Aetrix verify that NCP1117ST18T3 is sourced from the original manufacturer or authorized distributors?
All NCP1117ST18T3 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 NCP1117ST18T3 meets industry standards.
7.What is the process for return or replacement of NCP1117ST18T3?
All NCP1117ST18T3 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117ST18T3, 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 NCP1117ST18T3 part is unused and in its original packaging.
Return procedure for NCP1117ST18T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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