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Diodes Incorporated AP1084T33L-U
- Part No.:
- AP1084T33L-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-220-3
- Datasheet:
-
AP1084T33L-U.pdf
- Description:
- IC REG LINEAR 3.3V 5A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,851
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Product details
Overview
AP1084T33L-U from Diodes Incorporated is a 5A low-dropout linear regulator in TO220-3L package, fixed 3.3V output, with 1.4V max dropout at full load, thermal shutdown, and current limiting. It delivers stable 3.3V/5A power for high-speed bus termination, VGA card supplies, and low-current logic systems operating from 4.8–12V input rails.
For engineers reviewing the AP1084T33L-U datasheet, AP1084T33L-U pinout, AP1084T33L-U application, or AP1084T33L-U equivalent, key selection criteria include dropout voltage under 5A load, thermal resistance (θJA = 78°C/W), output stability with ≥10µF capacitor, and fixed-mode operation without external resistors.
Technical Context
The AP1084T33L-U uses an internal 1.25V reference and error amplifier to regulate output via a PNP pass transistor. Its fixed 3.3V output is trimmed to ±2% over temperature and line/load conditions, with fast transient response enabled by internal compensation requiring only a 10µF output capacitor (ESR 0.15–20Ω).
Thermal shutdown activates at 150°C junction temperature, and current limiting holds output at ~5.1A during overload. The device operates across 0–125°C junction range and requires VIN ≥ VOUT + 1.4V to maintain regulation - enabling 3.3V output from as low as 4.7V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.300 V ±2% (measured at 10mA, 25°C, VIN = 5V) |
| Max Dropout Voltage | 1.4 V at 5A load (ensures regulation down to VIN = 4.7V for 3.3V output) |
| Output Current | 5.0 A continuous (limited to 5.1A internally; supports high-current logic rails) |
| Line Regulation | 0.2% (input variation 4.8–12V; maintains tight output under supply ripple) |
| Load Regulation | 26–33 mV (0–5A load step; critical for FPGA/GPU core rail stability) |
| Thermal Resistance θJA | 78 °C/W (TO220-3L on FR-4, 2oz Cu; dictates heatsink requirement for 15W dissipation) |
| Reference Voltage | 1.250 V ±2% (internal bandgap reference; sets accuracy baseline for fixed output) |
Pinout & Package
AP1084T33L-U uses TO220-3L package with exposed thermal tab electrically connected to VOUT. Mounting the tab to a heatsink improves thermal performance; PCB copper area must match recommended pad layout (Diodes AP02001) for θJA compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj/GND) | Adjust/Ground terminal | Internally tied to ground in fixed-mode; no external connection required for 3.3V operation |
| 2 (VOUT) | Regulated output | Delivers 3.3V/5A; tab is electrically connected to this pin - must be heatsinked and isolated from chassis ground if needed |
| 3 (VIN) | Input supply | Accepts 4.8–12V DC; requires ≥10µF input capacitor near pin to prevent sag during 5A transients |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V output | No external resistors needed - simplifies BOM and layout for standard logic rail generation |
| 1.4V dropout @ 5A | Enables efficient 3.3V conversion from 5V or 12V sources without switching noise |
| Integrated thermal shutdown | Auto-recovery protection at 150°C junction temperature - prevents permanent damage during overload or poor heatsinking |
| Current limiting | Clamps output at ~5.1A - avoids catastrophic failure during short-circuit or startup inrush |
| Fast transient response | Stabilizes within microseconds after 0–5A load steps - reduces need for large bulk capacitance |
Applications
| High-Speed Bus Termination | VGA Graphics Card Power |
|---|---|
|
Use Scenario: Providing clean, low-noise 3.3V termination voltage for DDR memory buses or PCI Express lanes. IC Role / Device Role / Timing Role: Fixed-output LDO delivering stable 3.3V rail with <33mV load regulation across 0–5A steps. Use Value: Eliminates switching noise interference on sensitive high-speed data lines while maintaining voltage accuracy within ±2%. |
Use Scenario: Supplying 3.3V auxiliary power to GPU memory interface and display controller ICs on discrete graphics cards. IC Role / Device Role / Timing Role: Primary 5A linear regulator handling dynamic load bursts during frame rendering and memory access. Use Value: Delivers fast transient response (<10µs recovery) and low output impedance to prevent voltage droop during GPU clock domain switching. |
| Industrial PLC I/O Module | Embedded Network Switch ASIC Supply |
|
Use Scenario: Powering isolated 3.3V logic rails for digital input/output conditioning circuits in programmable logic controllers. IC Role / Device Role / Timing Role: Local point-of-load regulator with thermal shutdown protecting against field-wiring faults or ambient temperature rise. Use Value: Maintains regulation over 0–75°C ambient with TO220 heatsink, avoiding brownouts during extended operation. |
Use Scenario: Generating 3.3V core voltage for Ethernet switch ASICs requiring low-noise, ripple-free supply in fanless edge switches. IC Role / Device Role / Timing Role: Low-EMI linear regulator replacing switching converters to meet CISPR-22 Class B emissions limits. Use Value: Achieves >60dB PSRR at 100kHz - suppresses upstream supply noise without added filtering components. |
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 |
|---|---|---|---|
| AP1084K33L-13 | Same die, TO263-3L package (θJA = 60°C/W), tape-and-reel packaging | Better thermal performance; suited for compact SMT layouts with limited heatsink area | Select when board space is constrained and thermal management favors surface-mount mounting |
| LD1085V33 | STMicroelectronics part; 3A rated, 1.3V dropout, TO220 package, ±2% tolerance | Lower current capability; not suitable for sustained 5A loads or high-transient applications | Choose only for cost-sensitive 3A designs where AP1084T33L-U's 5A headroom is unnecessary |
Compared with AP1084K33L-13, the AP1084T33L-U trades thermal efficiency for through-hole mechanical robustness and ease of manual heatsinking; versus LD1085V33, it provides 67% higher current capacity and tighter load regulation under full 5A step conditions.
Availability
AP1084T33L-U is available at Aetrix Electronics and suitable for industrial PLC I/O modules, embedded network switches, and VGA graphics card power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.
Supply support for AP1084T33L-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 AP1084 product line targets high-current, low-noise linear regulation for logic and bus termination applications - emphasizing dropout voltage, thermal resilience, and transient response over switching efficiency.
FAQ
Is AP1084T33L-U pin-compatible with other AP1084 fixed-voltage variants?
Yes - all AP1084 fixed-output versions (1.5V, 1.8V, 2.5V, 3.3V, 5.0V) share identical TO220-3L pinout and internal circuitry. Only the output voltage trim differs; no layout changes are needed when substituting between fixed variants.
What minimum output capacitance is required for stability?
A minimum 10µF aluminum or tantalum capacitor with ESR between 0.15Ω and 20Ω is required at the VOUT pin. Ceramic capacitors alone are insufficient due to ultra-low ESR; a hybrid approach (e.g., 10µF tantalum + 1µF ceramic) ensures stability and transient response.
Can AP1084T33L-U operate without a heatsink?
No - at 5A output with 4.8V input (1.5W dissipation), junction temperature rises rapidly. With θJA = 78°C/W, even 10°C ambient requires ≥10°C/W heatsink to stay below 125°C. Derating is mandatory above 2A without active cooling.
Does the "L" suffix indicate RoHS compliance?
Yes - "L" denotes lead-free finish per EU Directive 2002/95/EC (RoHS), with exemptions applied. The device uses matte tin plating and green molding compound (no Br/Sb), verified per Diodes Inc. lead-free documentation AP02001 and DS31070.
AP1084T33L-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):
- 12V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.4V @ 5A
- Current - Output:
- 5A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- -
- 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
AP1084T33L-U FAQ
1.How can I place an order for AP1084T33L-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1084T33L-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 AP1084T33L-U reliable?
The price and inventory of AP1084T33L-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1084T33L-U is usually 5 days.
3.What payment methods are accepted for AP1084T33L-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1084T33L-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1084T33L-U?
AP1084T33L-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1084T33L-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 AP1084T33L-U?
For technical support, including AP1084T33L-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1084T33L-U requirements.
6.How does Aetrix verify that AP1084T33L-U is sourced from the original manufacturer or authorized distributors?
All AP1084T33L-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 AP1084T33L-U meets industry standards.
7.What is the process for return or replacement of AP1084T33L-U?
All AP1084T33L-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1084T33L-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 AP1084T33L-U part is unused and in its original packaging.
Return procedure for AP1084T33L-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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