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Diodes Incorporated AP1084D25L-U
- Part No.:
- AP1084D25L-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
AP1084D25L-U.pdf
- Description:
- IC REG LINEAR 2.5V 5A TO252-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,701
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Product details
Overview
AP1084D25L-U from Diodes Incorporated is a 5A low-dropout linear regulator in TO252-3L package, fixed 2.5V output, with 1.4V max dropout at full load, thermal shutdown, and current limiting. It delivers stable 2.5V/5A supply for high-speed bus termination and low-current logic rails in VGA cards and embedded power subsystems.
For engineers reviewing the AP1084D25L-U datasheet, AP1084D25L-U pinout, AP1084D25L-U application, or AP1084D25L-U equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-chain support for industrial and computing power designs.
Technical Context
The AP1084D25L-U integrates a precision 1.25V bandgap reference, error amplifier, and PNP pass transistor to regulate output voltage with minimal input–output differential. Its internal current limit and thermal shutdown operate independently of external components, ensuring protection under overload or ambient overtemperature.
It supports both fixed-output (2.5V) and adjustable modes via the Adj pin, though AP1084D25L-U is factory-configured for fixed 2.5V operation. Output stability requires ≥10µF capacitor with ESR between 0.15Ω and 20Ω, and layout must minimize trace inductance between VOUT and capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.500 V ±2% at 10mA, 25°C - ensures compatibility with 2.5V I/O standards like PCI-X and DDR2 memory interfaces. |
| Max Dropout Voltage | 1.4 V at 5A load - enables regulation from 3.9V input, supporting single-stage conversion from common 5V or 12V rails. |
| Output Current | 5.0 A continuous - sufficient for powering multi-core SoCs, FPGA I/O banks, or GPU auxiliary rails. |
| Line Regulation | 0.2% over VIN = 4V–12V - maintains tight output accuracy despite upstream supply ripple or sag. |
| Load Regulation | 20–25 mV over 0–5A - limits output deviation during dynamic CPU/GPU load transients without requiring remote sensing. |
| Thermal Shutdown | 150°C junction temperature - protects against sustained overload or inadequate heatsinking in compact PCB layouts. |
| Package Thermal RθJA | 73°C/W (TO252-3L, FR-4, 2oz Cu) - defines minimum copper area and thermal vias needed to sustain 5A at 70°C ambient. |
Pinout & Package
AP1084D25L-U uses the TO252-3L (DPAK) surface-mount package with exposed thermal tab electrically connected to VOUT. The tab must be soldered to a large copper pour for thermal performance and electrical grounding of the output rail.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Adj/GND) | Reference node / Ground return | In fixed-mode (2.5V), this pin is internally tied to GND; externally must be connected to ground plane to complete feedback loop and ensure stability. |
| Pin 2 (VOUT) | Regulated output terminal | Delivers 2.5V/5A; connects directly to load and output capacitor; tab is electrically identical and must be thermally coupled to PCB copper. |
| Pin 3 (VIN) | Unregulated input supply | Accepts 4.0–12V input; requires local 100µF bulk capacitance near pin to suppress transient droop during 5A load steps. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | ±40mV deviation under 0→5A 100µs load step - reduces need for oversized output capacitance in space-constrained VGA or embedded modules. |
| Built-in current limiting | 5.1A typical trip threshold - prevents damage during short-circuit events without external foldback circuitry. |
| Lead-free & RoHS-compliant | Meets EU Directive 2002/95/EC with no Br/Sb - qualifies for green manufacturing and export compliance without process requalification. |
| Low noise rejection | 60dB PSRR at 120Hz - suppresses ripple from switching pre-regulators, enabling clean analog or clock-domain supplies. |
| Stable with ceramic capacitors | Compatible with 10µF X5R/X7R MLCCs (ESR ≥0.15Ω) - allows smaller footprint vs. electrolytic, improving board density in portable designs. |
Applications
| VGA Graphics Card Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Providing 2.5V/5A to GPU memory interface and display controller logic on PCIe-based graphics add-in cards. IC Role / Device Role / Timing Role: Primary 2.5V LDO regulator delivering low-noise, high-current supply to DDR2 SDRAM and TMDS transmitter circuits. Use Value: 1.4V dropout enables direct regulation from 3.3V or 5V system rails, eliminating intermediate buck stages and reducing BOM count by one DC-DC converter. |
Use Scenario: Powering isolated digital I/O drivers and fieldbus communication ICs (e.g., RS-485 transceivers) in programmable logic controllers. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 5V backplane supply to stable 2.5V for logic-level translation and sensor interface circuitry. Use Value: Integrated thermal shutdown and current limiting eliminate need for external protection components, simplifying safety-certified industrial design. |
| Embedded Network Switch ASIC | Medical Imaging Front-End |
|
Use Scenario: Supplying 2.5V core voltage to packet processing ASICs and SerDes PHYs in managed Ethernet switches. IC Role / Device Role / Timing Role: High-current LDO supplying clean power to timing-critical SerDes lanes and internal PLLs. Use Value: 0.2% line regulation ensures <±25mV output variation across varying upstream DC-DC output, preserving signal integrity in 1G/2.5G Ethernet links. |
Use Scenario: Delivering regulated 2.5V to analog front-end ADC drivers and low-noise op-amps in ultrasound or MRI signal conditioning boards. IC Role / Device Role / Timing Role: Low-ripple, low-noise analog supply rail decoupled from noisy digital domains using integrated PSRR and layout-optimized thermal pad. Use Value: 60dB PSRR at 120Hz rejects switching noise from adjacent DC-DC converters, maintaining >12-bit ENOB in precision medical data acquisition. |
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 |
|---|---|---|---|
| AP1084K25L-13 | Same silicon, TO263-3L package (RθJC = 3.5°C/W vs. 12°C/W for TO252); higher thermal performance but larger footprint. | Better suited for convection-cooled industrial enclosures where heatsink mounting is impractical. | Select when junction temperature must stay below 110°C at 5A continuous without forced airflow or external heatsink. |
| LD1085V25 | STMicroelectronics part; 3A rated, 1.3V dropout, 1.25V reference; lacks fast transient response spec and has lower PSRR (45dB). | Acceptable for static loads (e.g., microcontroller cores) but marginal for burst-mode GPU or FPGA I/O. | Choose only if 3A output suffices and cost sensitivity outweighs need for 5A headroom and transient robustness. |
Compared with AP1084D25L-U, AP1084K25L-13 offers superior thermal dissipation in space-constrained environments, while LD1085V25 trades current capability and dynamic performance for broader vendor availability and lower unit cost in non-demanding applications.
Availability
AP1084D25L-U is available at Aetrix Electronics and suitable for VGA graphics card power, industrial PLC I/O modules, embedded network switch ASICs, and medical imaging front-end designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for AP1084D25L-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 high-reliability power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.
The AP1084 series belongs to Diodes' high-current LDO portfolio, engineered specifically for low-voltage, high-current point-of-load regulation in graphics, networking, and embedded systems where thermal efficiency and transient immunity are critical.
FAQ
Can AP1084D25L-U be used in adjustable mode?
No. AP1084D25L-U is factory-trimmed for fixed 2.5V output. Its Adj pin is internally connected to ground and must be externally grounded. Attempting to configure it as adjustable will result in incorrect output voltage and potential instability due to missing external resistor divider.
What is the minimum input voltage required for regulation at full load?
The minimum input voltage is 3.9V: 2.5V nominal output plus 1.4V maximum dropout at 5A. Below this, the device enters dropout and output voltage drops linearly with input. Operation below 3.9V is not guaranteed to maintain regulation per datasheet specifications.
Is a heatsink required for 5A continuous operation?
Yes, for sustained 5A operation above 25°C ambient. With RθJA = 73°C/W, 5A at 2.5V output (12.5W dissipation) raises junction temperature by ~912°C above ambient-far exceeding 150°C rating. A minimum 10 cm² 2oz copper pour with 6 thermal vias is mandatory; external heatsink recommended for >1A continuous in enclosed environments.
Does AP1084D25L-U support ceramic output capacitors?
Yes, provided the capacitor's ESR is ≥0.15Ω. Standard X5R/X7R MLCCs typically have ESR <0.05Ω and may cause oscillation. Use ESR-specified ceramics (e.g., TDK C3216X5R1E106M160AB) or add a 0.22Ω damping resistor in series with the capacitor to meet stability requirements.
AP1084D25L-U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 2.5V
- 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:
- Surface Mount
- Supplier Device Package:
- TO-252-3
AP1084D25L-U FAQ
1.How can I place an order for AP1084D25L-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1084D25L-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 AP1084D25L-U reliable?
The price and inventory of AP1084D25L-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1084D25L-U is usually 5 days.
3.What payment methods are accepted for AP1084D25L-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1084D25L-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1084D25L-U?
AP1084D25L-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1084D25L-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 AP1084D25L-U?
For technical support, including AP1084D25L-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1084D25L-U requirements.
6.How does Aetrix verify that AP1084D25L-U is sourced from the original manufacturer or authorized distributors?
All AP1084D25L-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 AP1084D25L-U meets industry standards.
7.What is the process for return or replacement of AP1084D25L-U?
All AP1084D25L-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1084D25L-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 AP1084D25L-U part is unused and in its original packaging.
Return procedure for AP1084D25L-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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