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onsemi NCP1117ST20T3
- Part No.:
- NCP1117ST20T3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NCP1117ST20T3.pdf
- Description:
- IC REG LINEAR 2V 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:4,530
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Product details
Overview
NCP1117ST20T3 from onsemi is a 2.0 V fixed-output, 1.0 A low-dropout linear voltage regulator in SOT-223 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 controllers and hard drive power rails where input voltage ranges up to 20 V.
For engineers reviewing the NCP1117ST20T3 datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at full load, thermal resistance with PCB copper area, no-minimum-load operation, and compatibility with 10 µF ceramic output capacitance for stability.
Technical Context
The NCP1117ST20T3 uses an internal bandgap reference trimmed to ±1.0% and a PNP pass transistor architecture enabling low dropout. 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.
It integrates current limiting, safe operating area (SOA) compensation, and thermal shutdown triggered at ~175°C. Input voltage range is 3.4 V to 12 V for 2.0 V output, with line regulation of 0.5 mV and load regulation of 3.0 mV over 0–800 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.000 V ±1.0% - tightly regulated fixed output, no external resistors required |
| Max Output Current | 1.0 A - supports high-current digital logic rails and peripheral power without derating below 800 mA |
| Dropout Voltage | 1.20 V at 800 mA - enables operation with Vin as low as 3.4 V while maintaining regulation |
| Input Voltage Range | 3.4 V to 12 V - compatible with 5 V and 12 V system rails; absolute max 20 V |
| Thermal Shutdown | ~175°C junction - protects against sustained overload or inadequate heatsinking |
| Ripple Rejection | 60 dB at 120 Hz - suppresses switching noise from upstream DC/DC converters |
| Quiescent Current | 4.5 mA - low bias current improves efficiency in always-on subsystems |
Pinout & Package
SOT-223 package (Case 318H), surface-mount, with exposed metal tab thermally connected to Pin 2 (Output). Requires minimum PCB copper area for thermal management per Figure 21.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground / Adjust | Reference node for internal error amplifier; connects to system ground; no external components needed for fixed-output version |
| 2 | Output | Regulated 2.0 V supply; electrically and thermally tied to exposed heatsink tab |
| 3 | Input | Unregulated input (3.4–12 V); requires local 10 µF bypass capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| No minimum load requirement | Enables stable regulation down to 0 mA output - ideal for standby or intermittent-load systems |
| Internal SOA compensation | Prevents thermal runaway during transient overloads without external foldback circuitry |
| Pb-free SOT-223 package | RoHS-compliant footprint with standardized 2.3 mm pitch; tab soldered for thermal conduction |
| 100% current limit tested | Guarantees ≥1000 mA output before foldback - simplifies design margining for 1 A loads |
| Stable with 10 µF ceramic output cap | Eliminates need for tantalum or electrolytic capacitors - reduces BOM cost and size |
Applications
| Industrial Motor Control Logic | Hard Disk Drive Controller Power |
|---|---|
Use Scenario: Powers FPGA configuration logic and microcontroller I/O banks in servo drives operating from 5 V or 12 V intermediate rails. IC Role / Device Role / Timing Role: Point-of-regulation LDO delivering clean 2.0 V to low-voltage logic interfaces with fast transient response. Use Value: Maintains regulation during motor startup surges due to 1.2 V dropout and 1 A current capability. | Use Scenario: Supplies 2.0 V to HDD servo ASICs and read-channel ICs requiring ultra-low noise and zero-load stability. IC Role / Device Role / Timing Role: Primary analog rail regulator with <0.01%/W thermal regulation and 0.003% RMS noise. Use Value: Eliminates need for post-LDO filtering; meets tight 2.0 V ±20 mV tolerance across temperature. |
| Consumer Set-Top Box SoC Core | Battery Charger Management Circuit |
Use Scenario: Provides 2.0 V core voltage to media processor subsystems in cable/satellite receivers with variable processing load. IC Role / Device Role / Timing Role: Load-following LDO supporting dynamic voltage scaling with 3.0 mV load regulation. Use Value: Delivers consistent voltage under rapid CPU/GPU activity changes without external compensation. | Use Scenario: Generates 2.0 V bias for charger IC control logic and ADC reference in multi-cell Li-ion charging modules. IC Role / Device Role / Timing Role: Precision reference rail with ±1.0% initial accuracy and 0.3% long-term stability. Use Value: Ensures accurate battery voltage sensing and charge termination timing over 1000+ hours of operation. |
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 |
|---|---|---|---|
| TLV1117-20CDCYR | 2.0 V fixed, 800 mA max, 1.2 V dropout at 800 mA, SOT-223, ±2% accuracy | Lower current rating and looser voltage tolerance; not rated for 12 V input | Acceptable for <800 mA, non-critical 2.0 V rails where cost is prioritized over precision |
| LD1117S20TR | 2.0 V fixed, 800 mA max, 1.1 V dropout at 800 mA, SOT-223, ±2% accuracy, no AEC-Q100 option | Lower dropout but reduced current and accuracy; lacks automotive qualification path | Suitable for commercial-grade 2.0 V supplies with tighter dropout budget but lower reliability requirements |
Compared with TLV1117-20CDCYR and LD1117S20TR, the NCP1117ST20T3 provides higher guaranteed output current (1.0 A vs. 800 mA), tighter initial accuracy (±1.0% vs. ±2%), and support for 12 V input - making it preferred for industrial and automotive-qualified designs demanding robustness and margin.
Availability
NCP1117ST20T3 is available at Aetrix Electronics and suitable for industrial motor control, hard disk drive power, and consumer SoC core voltage regulation requiring stable component supply, RoHS compliance, and long-lifecycle availability.
Supply support for NCP1117ST20T3 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 upgrade to legacy LM317-based LDOs, delivering improved dropout, accuracy, and thermal robustness for point-of-load regulation in space-constrained, thermally demanding applications.
FAQ
What is the maximum input voltage for the NCP1117ST20T3?
The NCP1117ST20T3 supports an absolute maximum input voltage of 20 V, but its specified operating input range for 2.0 V output is 3.4 V to 12 V. Exceeding 12 V may require derating output current to ≤1.0 A per datasheet Note 3, and thermal design must accommodate increased power dissipation.
Does the NCP1117ST20T3 require an output capacitor to remain stable?
Yes, the NCP1117ST20T3 requires a minimum 4.7 µF output capacitor with ESR between 33 mΩ and 2.2 Ω for stability. A 10 µF ceramic capacitor is recommended and validated in the datasheet for all operating conditions, eliminating need for tantalum or electrolytic types.
Is the NCP1117ST20T3 pin-compatible with the LM317?
No - the NCP1117ST20T3 is not pin-compatible with the LM317. While the NCP1117 series is functionally compatible and often used as a drop-in replacement in new designs, its pinout (Pin 1 = Ground, Pin 2 = Output, Pin 3 = Input) differs from the LM317 (Pin 1 = Adjust, Pin 2 = Output, Pin 3 = Input), requiring PCB layout change.
What thermal performance can be expected from the NCP1117ST20T3 in SOT-223 package?
In the SOT-223 package (Case 318H), the NCP1117ST20T3 has a typical RJA of 160°C/W on minimal PCB pad, improving to ~67°C/W with 1-inch square 2 oz. copper pour. Maximum power dissipation is thermally limited; for TA = 50°C, PDmax ≈ 0.63 W without heatsinking, rising with copper area per Figure 21.
Does the NCP1117ST20T3 have built-in protection features?
Yes, the NCP1117ST20T3 integrates three protection features: output current limiting (≥1000 mA), safe operating area (SOA) compensation to prevent secondary breakdown, and thermal shutdown activated at ~175°C junction temperature. These functions operate autonomously without external components.
NCP1117ST20T3 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):
- 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:
- SOT-223
NCP1117ST20T3 FAQ
1.How can I place an order for NCP1117ST20T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117ST20T3 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 NCP1117ST20T3 reliable?
The price and inventory of NCP1117ST20T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117ST20T3 is usually 5 days.
3.What payment methods are accepted for NCP1117ST20T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117ST20T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117ST20T3?
NCP1117ST20T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117ST20T3 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 NCP1117ST20T3?
For technical support, including NCP1117ST20T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117ST20T3 requirements.
6.How does Aetrix verify that NCP1117ST20T3 is sourced from the original manufacturer or authorized distributors?
All NCP1117ST20T3 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 NCP1117ST20T3 meets industry standards.
7.What is the process for return or replacement of NCP1117ST20T3?
All NCP1117ST20T3 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117ST20T3, 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 NCP1117ST20T3 part is unused and in its original packaging.
Return procedure for NCP1117ST20T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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