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onsemi NCP1117ST33T3
- Part No.:
- NCP1117ST33T3
- Manufacturer:
- onsemi
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NCP1117ST33T3.pdf
- Description:
- IC REG LINEAR 3.3V 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:1,348
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Product details
Overview
NCP1117ST33T3 from onsemi is a 3.3 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, ±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 industrial controllers and embedded power rails.
For engineers reviewing the NCP1117ST33T3 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 (≤4.3 mV/≤10 mV), ripple rejection (62 dB at 120 Hz), and compatibility with 10 µF ceramic output capacitance.
Technical Context
The NCP1117ST33T3 implements a bandgap-referenced series pass architecture with internal trimming for ±1.0% initial output accuracy and 0.5% temperature stability. Its dropout behavior is characterized across temperature (−40°C to +125°C) and load (0–800 mA), maintaining regulation down to Vin = 4.75 V.
Protection circuitry includes foldback current limiting activated above ~1.5 A, thermal shutdown triggered at ~175°C junction temperature, and safe operating area compensation to prevent secondary breakdown during transient overloads. No minimum load is required to maintain regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±1.0% (1.5 V to 12 V fixed variants available; no min load required) |
| Max Output Current | 1.0 A continuous (derated above TA = 125°C; limited to 1.0 A when Vin > 12 V) |
| Dropout Voltage | 1.2 V max at 800 mA over temperature (enables operation with Vin as low as 4.75 V) |
| Ripple Rejection | 62 dB at 120 Hz (critical for post-regulation after switching supplies) |
| Line Regulation | 0.8 mV (for Vin = 4.75–15 V, Iout = 0 mA; ensures stable rail under input variation) |
| Load Regulation | 4.3 mV (for Iout = 0–800 mA, Vin = 4.75 V; maintains tight tolerance under dynamic load) |
| Quiescent Current | 6.0 mA (at Vin = 15 V; enables low-noise, low-power biasing) |
Pinout & Package
SOT-223 package (Case 318H), surface-mount, with exposed metal tab thermally and electrically connected to Pin 2 (Output). Requires minimum PCB copper pad for thermal management per Figure 21.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground | Reference node for internal bandgap and error amplifier; connects to system ground plane |
| 2 | Output | Regulated 3.3 V supply; tab is internally bonded to this pin for thermal conduction |
| 3 | Input | Unregulated DC input (up to 20 V); requires local 10 µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Operation | Enables 3.3 V rail generation from 5 V or 12 V sources with minimal headroom loss |
| ±1.0% Initial Accuracy | Reduces need for external calibration in precision analog or ADC reference circuits |
| No Minimum Load Requirement | Eliminates dummy load resistors in low-power sleep modes (e.g., IoT sensor nodes) |
| Integrated Thermal Shutdown | Prevents catastrophic failure during sustained overload or inadequate heatsinking |
| Pb-Free SOT-223 Package | Complies with RoHS and JEDEC moisture sensitivity level (MSL) 3 requirements |
Applications
| Industrial Motor Control Boards | Hard Disk Drive Controllers |
|---|---|
Use Scenario: Powering FPGA configuration logic and interface buffers on servo drive PCBs with 5 V or 12 V intermediate bus. IC Role / Device Role / Timing Role: Fixed 3.3 V LDO providing clean, low-noise supply for digital core logic and LVDS transceivers. Use Value: 62 dB ripple rejection suppresses switching noise from upstream DC/DC converters, preventing bit errors in high-speed serial links. | Use Scenario: Regulating 3.3 V for HDD microcontroller, flash memory, and SATA PHY circuitry. IC Role / Device Role / Timing Role: Primary point-of-load regulator replacing older LM317-based designs. Use Value: Pin compatibility with LM317 allows drop-in upgrade without layout changes while improving dropout and accuracy. |
| Consumer Set-Top Box Power Rails | Battery Charger Supervisory Circuits |
Use Scenario: Generating stable 3.3 V for SoC peripherals and HDMI CEC logic in cable/satellite receivers. IC Role / Device Role / Timing Role: Secondary LDO supplying always-on subsystems during standby mode. Use Value: 6.0 mA quiescent current minimizes standby power draw, supporting Energy Star compliance. | Use Scenario: Providing isolated 3.3 V bias for fuel gauge ICs and battery protection MOSFET drivers in Li-ion chargers. IC Role / Device Role / Timing Role: Low-noise, thermally robust regulator powering safety-critical monitoring circuitry. Use Value: Thermal shutdown and SOA compensation ensure reliable operation during charger fault conditions (e.g., shorted battery). |
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 |
|---|---|---|---|
| LM1117MPX-3.3/NOPB | Higher dropout (1.2 V typ at 800 mA vs. 1.07 V typ for NCP1117ST33T3); ±2% output accuracy | Limited thermal performance in SOT-223; not qualified for automotive temp range | Acceptable for cost-sensitive consumer designs where tighter accuracy and lower dropout are non-critical |
| TLV1117-33CDCYR | Lower quiescent current (4.5 mA vs. 6.0 mA); 800 mA max output; ±2% accuracy | Optimized for portable battery-powered systems; lacks automotive-grade variants | Preferred for ultra-low-power applications with <800 mA load and relaxed accuracy requirements |
Compared with LM1117MPX-3.3/NOPB and TLV1117-33CDCYR, the NCP1117ST33T3 delivers superior output accuracy (±1.0%), lower dropout at full load, and broader industrial temperature support (0°C to +125°C), making it optimal for mission-critical embedded control and storage applications.
Availability
NCP1117ST33T3 is available at Aetrix Electronics and suitable for industrial motor control boards, hard disk drive controllers, and consumer set-top box power rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for NCP1117ST33T3 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 for high-reliability point-of-load regulation in industrial and computing equipment, emphasizing low dropout, tight output accuracy, and robust thermal protection-distinct from general-purpose regulators.
FAQ
What is the maximum input voltage rating for the NCP1117ST33T3?
The NCP1117ST33T3 supports a maximum input voltage of 20 V, as specified in the Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. For reliable 3.3 V output, the minimum recommended input is 4.75 V to maintain regulation across temperature and load, per the Electrical Characteristics table.
Does the NCP1117ST33T3 require an external capacitor on the output pin?
Yes, the NCP1117ST33T3 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 typical applications. Omitting Cout or using out-of-spec ESR may cause oscillation or poor transient response.
Is the NCP1117ST33T3 pin-compatible with the LM317?
The NCP1117ST33T3 is pin-compatible with the LM317 only in adjustable configurations (NCP1117STA), not in fixed-output variants like NCP1117ST33T3. The fixed 3.3 V version uses a different internal resistor network and does not replicate LM317's adjust-pin topology; direct substitution requires verifying PCB footprint and schematic connections.
What thermal derating applies to the NCP1117ST33T3 in SOT-223 package?
In SOT-223 (Case 318H), the NCP1117ST33T3 has RJA = 160°C/W with minimum pad, limiting power dissipation to ~0.625 W at TA = 50°C. Derating follows PD = (TJ(max) − TA) / RJA; for 1.0 A at VIN = 12 V, thermal design must ensure junction temperature stays ≤150°C via adequate copper area per Figure 21.
Can the NCP1117ST33T3 be used in automotive applications?
The standard NCP1117ST33T3 is rated for 0°C to +125°C ambient and is not AEC-Q100 qualified. For automotive use, select the NCV1117ST33T3G variant, which carries the NCV prefix, meets AEC-Q100 Grade 1 requirements (−40°C to +125°C), and is PPAP capable-explicitly designated for automotive and safety-critical systems.
NCP1117ST33T3 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):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 800mA
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 64dB (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
NCP1117ST33T3 FAQ
1.How can I place an order for NCP1117ST33T3 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117ST33T3 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 NCP1117ST33T3 reliable?
The price and inventory of NCP1117ST33T3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117ST33T3 is usually 5 days.
3.What payment methods are accepted for NCP1117ST33T3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117ST33T3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117ST33T3?
NCP1117ST33T3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117ST33T3 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 NCP1117ST33T3?
For technical support, including NCP1117ST33T3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117ST33T3 requirements.
6.How does Aetrix verify that NCP1117ST33T3 is sourced from the original manufacturer or authorized distributors?
All NCP1117ST33T3 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 NCP1117ST33T3 meets industry standards.
7.What is the process for return or replacement of NCP1117ST33T3?
All NCP1117ST33T3 units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117ST33T3, 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 NCP1117ST33T3 part is unused and in its original packaging.
Return procedure for NCP1117ST33T3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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