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Diodes Incorporated AP1117T33L-U
- Part No.:
- AP1117T33L-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-220-3
- Datasheet:
-
AP1117T33L-U.pdf
- Description:
- IC REG LINEAR 3.3V 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,087
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Product details
Overview
AP1117T33L-U from Diodes Incorporated is a 1A low-dropout linear voltage regulator in TO220-3L package, delivering fixed 3.3V output with ≤1.4V dropout at full load, ±1% load regulation (33 mV), and 60–70 dB ripple rejection at 180 Hz. It integrates thermal shutdown and current limiting, and is used in PC peripherals, VGA cards, and 3.3V logic supply rails.
For engineers reviewing the AP1117T33L-U datasheet, AP1117T33L-U pinout, AP1117T33L-U application, or AP1117T33L-U equivalent, key selection criteria include dropout voltage under 1.4V at 1A, thermal resistance of 78°C/W (junction-to-ambient), fixed 3.3V output tolerance (±2%), minimum 10µF output capacitance requirement, and TO220-3L through-hole mounting compatibility.
Technical Context
The AP1117T33L-U employs an internal NPN pass transistor with feedback-controlled reference voltage (1.25V) to maintain stable 3.3V output across input voltages from 4.8V to 12V. Its architecture includes built-in current limiting and thermal shutdown triggered at 150°C junction temperature.
It achieves fast transient response via low-output-impedance design and requires only two external capacitors: ≥10µF at VIN (low-ESR ceramic or tantalum) and ≥22µF at VOUT (150mΩ–20Ω ESR). Ripple rejection is optimized for 180Hz noise common in switching power supply post-regulation stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.235–3.365V at 10mA, 25°C), enabling direct replacement of 3.3V logic rails without external resistors. |
| Dropout Voltage | 1.4V max at 1A load, allowing operation with as little as 4.7V input for stable 3.3V output-critical for 5V-to-3.3V conversion in legacy systems. |
| Load Regulation | 26–33 mV over 0–1A load range (at VIN = 5V), ensuring <1% output deviation during CPU or FPGA core current transients. |
| Ripple Rejection | 60–70 dB at 180Hz with 25µF tantalum output cap, suppressing switching noise from upstream DC/DC converters feeding sensitive analog or clock circuitry. |
| Thermal Resistance | 78°C/W (junction-to-ambient, TO220-3L on FR-4, 2oz copper, no airflow), defining maximum power dissipation (~1.9W at 75°C ambient before thermal shutdown). |
| Current Limit | 1.1A min (at VIN–VOUT = 5V), providing short-circuit protection while sustaining full 1A continuous output under derated thermal conditions. |
| Quiescent Current | 5–10mA minimum load requirement to maintain regulation, compatible with low-power standby modes in embedded peripherals. |
Pinout & Package
AP1117T33L-U uses the TO220-3L package: thermally enhanced through-hole outline with metal tab electrically connected to VOUT, requiring isolated heatsink mounting. Pin 1 = Adj/GND (ground for fixed-mode), Pin 2 = VOUT (output and thermal tab), Pin 3 = VIN (input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Adj/GND) | Ground reference terminal | Internally tied to ground for fixed 3.3V mode; must be connected to system GND-no external resistor network required. |
| Pin 2 (VOUT) | Regulated output and thermal path | Delivers 3.3V output; metal tab is electrically connected to this pin-requires electrical isolation when heatsinking to prevent shorting. |
| Pin 3 (VIN) | Unregulated input supply | Accepts 4.8–12V input; must remain ≥1.3V above VOUT to sustain regulation-minimum 4.7V input for reliable 3.3V operation. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout voltage | 1.4V max at 1A enables efficient 5V-to-3.3V conversion where headroom is constrained, reducing heat generation vs. older 2V-drop regulators. |
| Integrated thermal shutdown | Activates at 150°C junction temperature and cycles output off/on during overload, eliminating need for external thermal monitoring circuitry. |
| High ripple rejection | 70dB at 180Hz suppresses low-frequency switching noise from buck converters, improving signal integrity in mixed-signal PCBs. |
| Stable with standard capacitors | Guaranteed stability with 10µF input + 22µF output (150mΩ–20Ω ESR), avoiding costly low-ESR polymer or specialty ceramics. |
| Lead-free & RoHS-compliant | Meets EU Directive 2002/95/EC with green molding compound (no Br/Sb), supporting environmental compliance for industrial and consumer shipments. |
Applications
| PC Peripheral Power | VGA Card Core Supply |
|---|---|
|
Use Scenario: Providing clean 3.3V rail to USB hub controllers, SATA bridge ICs, and PCIe endpoint logic in desktop add-in cards. IC Role / Device Role / Timing Role: Primary post-regulator for noise-sensitive digital interfaces, replacing less stable 3-terminal ICs or discrete LDOs. Use Value: 33 mV load regulation ensures <1% voltage shift during hot-plug enumeration bursts, preventing link training failures. |
Use Scenario: Delivering stable 3.3V to GPU memory interface buffers and display controller I/O banks in legacy VGA graphics cards. IC Role / Device Role / Timing Role: Low-noise local regulator for high-speed parallel bus termination and pixel clock domain supplies. Use Value: 70 dB ripple rejection prevents switching artifacts from appearing as horizontal noise bars on analog RGB output. |
| Industrial Control I/O | Embedded Network Interface |
|
Use Scenario: Powering isolated CAN transceiver logic-side circuitry and microcontroller I/O banks in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling noisy 5V system rails from real-time control logic. Use Value: 1.4V dropout allows use with aging 5V supplies sagging to 4.8V, maintaining functional safety margins without redesign. |
Use Scenario: Supplying 3.3V to Ethernet PHYs, MAC controllers, and PoE-powered management microcontrollers in industrial gateways. IC Role / Device Role / Timing Role: Final-stage regulator after wide-input DC/DC, ensuring clean supply for Gigabit Ethernet timing recovery circuits. Use Value: Fast transient response minimizes voltage droop during packet burst transmission, preventing PHY reset or CRC errors. |
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 | TO220-3 package; 1.2V dropout at 800mA; 1.5% initial accuracy; higher quiescent current (5–10mA vs. AP1117's 5–10mA typical). | Same pinout but lower thermal resistance (65°C/W); better suited for higher ambient temperatures with minimal heatsinking. | Select if operating ambient exceeds 70°C or if tighter initial accuracy (±1.5%) is required over temperature drift. |
| SPX1117M3-L-3-3 | SOT-223-3L package; 1.1V dropout at 800mA; 1% load regulation; no thermal pad isolation requirement. | Surface-mount alternative with lower profile; lacks TO220's mechanical robustness and thermal mass for high-pulse loads. | Select for space-constrained PCBs where through-hole mounting is impractical and peak load currents remain ≤800mA. |
Compared with LM1117MPX-3.3/NOPB and SPX1117M3-L-3-3, AP1117T33L-U offers superior thermal performance in TO220 form factor (78°C/W vs. 65°C/W), lower cost per unit in tube packaging (-U suffix), and guaranteed 1.4V dropout at full 1A-making it optimal for cost-sensitive, thermally demanding 5V-to-3.3V conversions.
Availability
AP1117T33L-U is available at Aetrix Electronics and suitable for PC peripheral designs, industrial control I/O modules, and embedded network interface cards requiring stable component supply with long-term manufacturability and RoHS compliance.
Supply support for AP1117T33L-U 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP1117 series targets cost-effective, thermally robust linear regulation in legacy and new-design 3.3V/5V system rails-designed specifically for high-volume PC peripherals, VGA cards, and embedded control applications where reliability and ease of layout matter more than ultra-low quiescent current.
FAQ
What is the minimum input voltage required for AP1117T33L-U to regulate at 3.3V?
The AP1117T33L-U requires VIN ≥ VOUT + 1.3V to maintain regulation, so minimum input is 4.6V. However, datasheet testing specifies 4.8V as the lower limit for guaranteed 3.3V output across temperature and load-accounting for worst-case dropout (1.4V) and line/load regulation drift. Below 4.8V, output may drop out of spec under full 1A load or elevated temperature.
Can AP1117T33L-U be used with ceramic output capacitors?
Yes, but only if ESR is ≥150mΩ. The AP1117T33L-U requires 10–20Ω ESR for stability per datasheet; standard X7R/X5R ceramics have near-zero ESR and risk oscillation. Use either tantalum (150mΩ–20Ω ESR) or add a 150mΩ–1Ω series resistor with ceramic caps. Diodes Inc. confirms stability with 22µF tantalum or 10µF polymer + 150mΩ resistor.
How does the thermal shutdown behave under sustained overload?
When junction temperature reaches ~150°C, the AP1117T33L-U disables output and remains off until die cools to ~135°C, then re-enables-creating a duty-cycled "hiccup" mode. This protects against permanent damage but causes intermittent output. For continuous overload, external current limiting or foldback is recommended, as thermal cycling degrades long-term reliability.
Is AP1117T33L-U pin-compatible with older AP1117T33G-U or AP1117T33L-G variants?
Yes-both share identical TO220-3L pinout (Pin 1=GND, Pin 2=VOUT/tab, Pin 3=VIN), same electrical specs, and RoHS compliance. The "L" suffix denotes lead-free finish; "G" indicates green compound (halogen-free), but both meet RoHS. Mechanical footprint and thermal performance are identical-direct drop-in replacement with no layout change required.
AP1117T33L-U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.4V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (180Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
AP1117T33L-U FAQ
1.How can I place an order for AP1117T33L-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1117T33L-U 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 AP1117T33L-U reliable?
The price and inventory of AP1117T33L-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1117T33L-U is usually 5 days.
3.What payment methods are accepted for AP1117T33L-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1117T33L-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1117T33L-U?
AP1117T33L-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1117T33L-U 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 AP1117T33L-U?
For technical support, including AP1117T33L-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1117T33L-U requirements.
6.How does Aetrix verify that AP1117T33L-U is sourced from the original manufacturer or authorized distributors?
All AP1117T33L-U 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 AP1117T33L-U meets industry standards.
7.What is the process for return or replacement of AP1117T33L-U?
All AP1117T33L-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1117T33L-U, 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 AP1117T33L-U part is unused and in its original packaging.
Return procedure for AP1117T33L-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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