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onsemi NCP1117ST50T3
- Part No.:
- NCP1117ST50T3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NCP1117ST50T3.pdf
- Description:
- IC REG LINEAR 5V 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:4,919
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Product details
Overview
NCP1117ST50T3 from onsemi is a 5.0 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 features thermal shutdown, current limiting, and safe operating area protection, and is used for point-of-load regulation in industrial controllers and battery chargers.
For engineers reviewing the NCP1117ST50T3 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 (≤0.9 mV/≤4.3 mV), and compatibility with 10 µF ceramic input/output capacitors.
Technical Context
The NCP1117ST50T3 implements a monolithic PNP pass transistor architecture with internal bandgap reference trimmed to ±1.0%, enabling stable 5.0 V output across 0°C to +125°C ambient. Its control loop is optimized for stability with ≥4.7 µF output capacitance and ESR between 33 mΩ and 2.2 Ω.
It operates with input voltages from 6.5 V to 12 V (for 5.0 V output), supports infinite short-circuit duration due to thermal shutdown, and requires no minimum load - unlike adjustable variants that need ≥0.8 mA on the adjust pin to maintain regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±1.0% (±50 mV) over full temperature and load range - ensures tight tolerance for MCU core or analog sensor supply rails. |
| Max Dropout Voltage | 1.2 V at 800 mA (TJ = 125°C) - enables operation with only 6.2 V input, critical for post-regulation after buck converters. |
| Output Current | 1.0 A continuous (1.5 A typical short-circuit limit) - sufficient for powering FPGA I/O banks or motor driver logic sections. |
| Line Regulation | 0.9 mV (max) over 6.5–12 V input - minimizes output drift during input ripple or brown-out conditions. |
| Load Regulation | 4.3 mV (max) from 0–800 mA - maintains stable voltage under dynamic digital load switching. |
| Ripple Rejection | 60 dB at 120 Hz (Vin−Vout = 3.0 V, Iout = 500 mA) - suppresses switching noise from upstream DC/DC stages. |
| Quiescent Current | 6.0 mA (max) at Vin = 15 V - low static consumption suitable for always-on subsystems. |
Pinout & Package
SOT-223 package (Case 318H) with exposed metal tab thermally connected to Pin 2 (Output); designed for PCB copper heatsinking using ≥2 oz copper pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground | Reference node for internal error amplifier; must be low-impedance path to system ground to avoid load regulation error. |
| 2 | Output | Regulated 5.0 V supply; heatsink tab is electrically connected here - requires isolation from other planes if chassis ground is not common. |
| 3 | Input | Unregulated input (6.5–12 V); bypass capacitor (≥10 µF ceramic) must be placed directly between Pin 3 and Pin 1. |
Key Features
| Feature | Design Value |
|---|---|
| No minimum load requirement | Enables use in standby modes where downstream circuitry draws near-zero current without output voltage drift. |
| Thermal shutdown activation at ~175°C | Prevents permanent damage during transient overloads or inadequate heatsinking; output recovers automatically upon cooling. |
| Stable with 10 µF ceramic output capacitor | Eliminates need for tantalum or electrolytic caps - reduces BOM cost and improves reliability in high-vibration environments. |
| Pin-compatible with LM317 | Allows drop-in replacement in legacy designs without PCB revision, retaining same footprint and external component values. |
| Pb-free, RoHS-compliant packaging | Meets global environmental compliance requirements for industrial and consumer end equipment shipments. |
Applications
| Consumer Equipment Power Rail | Industrial Controller Point-of-Regulation |
|---|---|
Use Scenario: Providing clean 5.0 V supply to microcontroller peripherals (USB PHY, ADC, SPI flash) in smart home hubs. IC Role / Device Role / Timing Role: Fixed-output LDO regulator maintaining stable voltage despite varying USB host negotiation currents and RF interference. Use Value: ±1.0% output accuracy and 60 dB ripple rejection ensure reliable USB enumeration and low-noise ADC conversions. | Use Scenario: Regulating 5.0 V for PLC I/O module logic and isolated CAN transceiver interface. IC Role / Device Role / Timing Role: Primary local power source for digital logic, decoupled from noisy 24 V field bus supply. Use Value: 1.2 V dropout allows operation from 6.2 V intermediate rail, while thermal shutdown protects against enclosure overheating. |
| Battery Charger Reference Supply | Hard Drive Controller Auxiliary Rail |
Use Scenario: Generating precise 5.0 V reference for charging IC feedback loop in multi-cell Li-ion charger. IC Role / Device Role / Timing Role: Stable voltage reference source for charge voltage sensing and state-of-charge calculation. Use Value: 0.9 mV line regulation prevents charging voltage drift during AC adapter ripple or input sag. | Use Scenario: Supplying 5.0 V to SATA controller ASIC and buffer memory in embedded storage systems. IC Role / Device Role / Timing Role: Low-noise, high-current local regulator for timing-critical data path components. Use Value: 4.3 mV load regulation ensures signal integrity during burst read/write operations with >500 mA peak current demand. |
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 |
|---|---|---|---|
| LM2940CT-5.0/NOPB | Higher dropout (0.5 V typ @ 100 mA, but 1.3 V @ 1 A); wider input range (up to 26 V); no SOT-223 option (TO-220 only). | Preferred in automotive 12 V systems with cold-crank margin; unsuitable for space-constrained SMT layouts. | Select when input can exceed 12 V and TO-220 mounting is acceptable; avoid for compact consumer PCBs. |
| TLV1117-50CDCYR | Lower quiescent current (6 mA vs. 6.0 mA max), same 1 A rating, but tighter initial accuracy (±1.5% vs. ±1.0%) and lower ripple rejection (55 dB). | Better for ultra-low-power always-on nodes; less effective for noisy switcher post-regulation. | Choose for battery-backed systems where IQ matters more than ripple suppression; verify thermal derating at 1 A. |
Compared with LM2940CT-5.0/NOPB and TLV1117-50CDCYR, the NCP1117ST50T3 offers superior output voltage accuracy (±1.0%), higher ripple rejection (60 dB), and SOT-223 surface-mount compatibility - making it optimal for space-limited industrial and consumer designs requiring precision and noise immunity.
Availability
NCP1117ST50T3 is available at Aetrix Electronics and suitable for industrial controllers, battery chargers, and consumer equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for NCP1117ST50T3 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 for high-reliability point-of-load regulation in cost-sensitive industrial and consumer systems, emphasizing low dropout, robust thermal protection, and compatibility with legacy LM317 footprints.
FAQ
What is the maximum input voltage for the NCP1117ST50T3?
The NCP1117ST50T3 supports a maximum input voltage of 12 V when regulating to 5.0 V, as specified in its electrical characteristics table for fixed-output devices. Exceeding this voltage risks exceeding the device's safe operating area, especially at high ambient temperatures or full load. The absolute maximum rating is 20 V, but operation above 12 V is restricted to lower output currents per Note 3 in the datasheet.
Does the NCP1117ST50T3 require an output capacitor, and what type is recommended?
Yes, the NCP1117ST50T3 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 widely used in typical applications. Tantalum or aluminum electrolytic types are acceptable if they meet the ESR and capacitance specifications across the full operating temperature range.
Is the NCP1117ST50T3 pin-compatible with the LM317?
Yes, the NCP1117ST50T3 is pin-compatible with the LM317 in SOT-223 package configurations. Both use the same pinout: Pin 1 = Adjust/Ground, Pin 2 = Output, Pin 3 = Input. This allows direct substitution in existing LM317-based designs without PCB changes, though external resistor networks are unnecessary for the fixed 5.0 V NCP1117ST50T3.
What thermal considerations apply when using the NCP1117ST50T3 at 1.0 A output current?
At 1.0 A and 6.5 V input (1.5 V dropout), the NCP1117ST50T3 dissipates ~1.5 W. With RJA ≈ 160°C/W on minimal PCB copper, junction temperature rise would exceed safe limits. A ≥1 in² 2 oz copper pad is required; Figure 21 shows RJA drops to ~60°C/W with 25 mm copper length, enabling reliable 1.0 A operation at TA ≤ 70°C.
Can the NCP1117ST50T3 be used in automotive applications?
The standard NCP1117ST50T3 is not qualified for automotive use. For AEC-Q100-compliant designs, the NCV1117ST50T3G variant must be selected - it shares identical electrical specs but undergoes additional qualification testing and PPAP documentation per automotive requirements.
NCP1117ST50T3 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):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 800mA
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 61dB (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
NCP1117ST50T3 FAQ
1.How can I place an order for NCP1117ST50T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117ST50T3 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 NCP1117ST50T3 reliable?
The price and inventory of NCP1117ST50T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117ST50T3 is usually 5 days.
3.What payment methods are accepted for NCP1117ST50T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117ST50T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117ST50T3?
NCP1117ST50T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117ST50T3 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 NCP1117ST50T3?
For technical support, including NCP1117ST50T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117ST50T3 requirements.
6.How does Aetrix verify that NCP1117ST50T3 is sourced from the original manufacturer or authorized distributors?
All NCP1117ST50T3 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 NCP1117ST50T3 meets industry standards.
7.What is the process for return or replacement of NCP1117ST50T3?
All NCP1117ST50T3 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117ST50T3, 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 NCP1117ST50T3 part is unused and in its original packaging.
Return procedure for NCP1117ST50T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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