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Diodes Incorporated AP1117T33G-U
- Part No.:
- AP1117T33G-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-220-3
- Datasheet:
-
AP1117T33G-U.pdf
- Description:
- IC REG LINEAR 3.3V 1A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,949
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Product details
Overview
AP1117T33G-U from Diodes Incorporated is a 1A low-dropout linear voltage regulator in TO220-3L package, fixed 3.3V output, with ≤1.4V dropout at full load, ±1% output voltage accuracy, and integrated thermal shutdown. It delivers stable 3.3V supply for low-current logic circuits, high-speed bus termination, and VGA card power rails under 6.4–18V input.
For engineers reviewing the AP1117T33G-U datasheet, AP1117T33G-U pinout, AP1117T33G-U application, or AP1117T33G-U equivalent, key selection criteria include dropout voltage at 1A load, thermal resistance (θJA = 78°C/W), output stability with 10µF/22µF capacitors, and fixed-output configuration eliminating external resistor networks.
Technical Context
The AP1117T33G-U uses an internal NPN pass transistor with bandgap reference and error amplifier to maintain regulation across 0–125°C junction temperature. Its architecture supports fast transient response via internal compensation and requires only 10µF output capacitance (ESR 0.15–20Ω) for stability.
It operates in fixed-mode with no adjustment pin required-pin 1 is grounded internally-enabling simplified PCB layout. Input-to-output differential must exceed 1.3V for regulation, and thermal shutdown activates at 150°C junction temperature with automatic recovery on cooldown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% (3.235–3.365V at 10mA, 25°C), enabling direct replacement of 3.3V logic supplies without trimming. |
| Dropout Voltage | 1.4V max at 1A load (ΔVOUT = 1%), allowing operation from 4.8V input to deliver regulated 3.3V-critical for 5V rail derivation. |
| Output Current | 1A continuous, with internal current limiting protecting against short-circuit faults without external foldback circuitry. |
| Ripple Rejection | 70dB typical at 180Hz with 25µF tantalum output cap, suppressing switching noise from upstream DC/DC converters. |
| Thermal Resistance | θJA = 78°C/W (TO220-3L, FR-4, 2oz Cu, no airflow), defining maximum power dissipation (PD ≈ 1.9W at ΔT = 150°C) before thermal shutdown. |
| Load Regulation | 33mV max (0–1A load step), ensuring minimal voltage sag during CPU/GPU core activity transients in embedded peripherals. |
| Operating Temp | 0°C to +125°C junction range, qualifying for commercial-grade PC peripheral and communication equipment use. |
Pinout & Package
AP1117T33G-U is housed in TO220-3L package with exposed thermal tab electrically connected to VOUT (pin 2). The tab must be mounted to a heatsink or copper pour for thermal management. Pin 1 (GND), pin 2 (VOUT), pin 3 (VIN) are arranged front-view left-to-right.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Internal ground node for fixed 3.3V mode; connects to system ground plane-no external resistor network needed. |
| 2 (VOUT) | Regulated output | Delivers 3.3V to load; tab is electrically tied to this pin-requires isolation from chassis ground unless system common is VOUT. |
| 3 (VIN) | Unregulated input | Accepts 4.8–18V DC; must be ≥1.3V above VOUT to sustain regulation; decoupled with ≥10µF capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V output | Eliminates external feedback resistors-reduces BOM count and layout area versus adjustable LDOs. |
| 1.4V dropout @ 1A | Enables efficient 5V-to-3.3V conversion with <1.9W dissipation at full load, reducing heatsink requirements. |
| Integrated thermal shutdown | Self-protects during overload or poor heatsinking-cycles off/on at ~150°C without latch-up or damage. |
| 70dB ripple rejection | Attenuates 180Hz switching artifacts from upstream converters, preserving signal integrity in analog-sensitive subsystems. |
| Lead-free & RoHS compliant | Meets EU Directive 2002/95/EC with green molding compound (Br/Sb-free), supporting environmental compliance programs. |
Applications
| PC Peripheral Power | VGA Card Core Supply |
|---|---|
|
Use Scenario: Powering USB hub controllers, SATA bridge ICs, and PCIe switch logic in desktop add-in cards. IC Role / Device Role / Timing Role: Primary 3.3V rail regulator delivering clean, low-noise supply to digital interface ICs. Use Value: Maintains 3.3V within ±1% across 0–1A load steps, preventing data corruption during hot-plug enumeration. |
Use Scenario: Providing stable 3.3V to GPU memory interfaces and display controller I/O banks on legacy VGA cards. IC Role / Device Role / Timing Role: Fixed-output LDO supplying timing-critical I/O voltage for DDR SDRAM and TMDS transmitters. Use Value: 70dB ripple rejection suppresses switching noise from GPU core DC/DC, avoiding pixel jitter or color banding. |
| High-Speed Bus Termination | Industrial Communication Module |
|
Use Scenario: Biasing parallel termination resistors on PCI, ISA, or LPC buses where precise 3.3V reference is required. IC Role / Device Role / Timing Role: Low-noise voltage source establishing termination voltage level for signal integrity margin. Use Value: 33mV load regulation ensures termination voltage remains stable during bus arbitration bursts, minimizing reflection errors. |
Use Scenario: Powering RS-485 transceivers and microcontroller peripherals in factory-floor Ethernet-to-serial gateways. IC Role / Device Role / Timing Role: Main 3.3V supply for isolated communication ICs operating in 0–70°C ambient environments. Use Value: Thermal shutdown protection prevents field failure during enclosure overheating, improving MTBF in unventilated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM1117MPX-3.3/NOPB | TO220-3 package, 1.2V dropout @ 800mA, 1.5% output tolerance, no RoHS-compliant green compound option. | Lacks 1A rating and 1.4V dropout spec at full load-requires derating for sustained 1A operation. | Select when legacy TI qualification or dual-sourcing is mandated; verify thermal margin with θJA = 80°C/W. |
| MCP1700T-3302E/MB | SOT23-3 package, 250mA output, 170mV dropout @ 250mA, 2% output tolerance-fundamentally lower current capability. | Not suitable for 1A loads; intended for ultra-low-power microcontrollers, not bus termination or VGA cards. | Use only for space-constrained, sub-250mA applications-cannot substitute for AP1117T33G-U's 1A capacity. |
Compared with LM1117MPX-3.3/NOPB, AP1117T33G-U offers tighter 1% output tolerance and guaranteed 1.4V dropout at 1A; versus MCP1700T-3302E/MB, it provides 4× higher current and TO220 thermal performance essential for industrial power delivery.
Availability
AP1117T33G-U is available at Aetrix Electronics and suitable for PC peripheral power, VGA card core supply, and high-speed bus termination requiring stable component supply, lead-free compliance, and TO220 thermal robustness.
Supply support for AP1117T33G-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
The AP1117 product line delivers cost-optimized, thermally robust LDO regulators targeting PC peripherals, communication modules, and graphics subsystems where fixed 3.3V/5.0V rails are required with minimal external components.
FAQ
What is the minimum input voltage required for AP1117T33G-U to regulate at full 1A load?
The device requires VIN ≥ VOUT + 1.3V to maintain regulation, so minimum input is 4.6V. However, datasheet specifies 4.8V minimum for guaranteed 3.3V output accuracy across temperature and load-below this, output may drop below 3.235V or lose regulation during transients.
Can AP1117T33G-U be used with ceramic output capacitors?
Yes, but only if ESR is ≥0.15Ω. Standard X7R/X5R ceramics typically have ESR <0.01Ω and risk instability. Use RC-damped ceramics (e.g., with 0.22Ω series resistor) or hybrid polymer-ceramic caps meeting the 0.15–20Ω ESR range specified in the datasheet.
Is the thermal tab of AP1117T33G-U electrically isolated?
No-the tab is internally connected to pin 2 (VOUT). When mounting to a heatsink, ensure electrical isolation using mica washers or insulating pads unless the heatsink is referenced to the 3.3V rail. Failure to isolate may cause short circuits in grounded-chassis systems.
Does AP1117T33G-U require an input capacitor?
Yes-a minimum 10µF aluminum or tantalum capacitor is recommended at VIN to prevent input voltage sag during load transients. Without it, line regulation degrades and the device may oscillate or drop out momentarily when load steps occur.
AP1117T33G-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
AP1117T33G-U FAQ
1.How can I place an order for AP1117T33G-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1117T33G-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 AP1117T33G-U reliable?
The price and inventory of AP1117T33G-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1117T33G-U is usually 5 days.
3.What payment methods are accepted for AP1117T33G-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1117T33G-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1117T33G-U?
AP1117T33G-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1117T33G-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 AP1117T33G-U?
For technical support, including AP1117T33G-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1117T33G-U requirements.
6.How does Aetrix verify that AP1117T33G-U is sourced from the original manufacturer or authorized distributors?
All AP1117T33G-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 AP1117T33G-U meets industry standards.
7.What is the process for return or replacement of AP1117T33G-U?
All AP1117T33G-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1117T33G-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 AP1117T33G-U part is unused and in its original packaging.
Return procedure for AP1117T33G-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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