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Diodes Incorporated AP1084T15L-U
- Part No.:
- AP1084T15L-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-220-3
- Datasheet:
-
AP1084T15L-U.pdf
- Description:
- IC REG LINEAR 1.5V 5A TO220-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,080
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Product details
Overview
AP1084T15L-U from Diodes Incorporated is a 5A low-dropout linear regulator in TO220-3L package, fixed 1.5V output, with 1.4V max dropout at full load, thermal shutdown, and current limiting. It delivers stable 1.5V supply for high-speed bus termination, low-current 3.3V logic subsystems, and VGA card power rails under 4.7–12V input.
For engineers reviewing the AP1084T15L-U datasheet, AP1084T15L-U pinout, AP1084T15L-U application, or AP1084T15L-U equivalent, key selection criteria include dropout voltage at 5A, thermal resistance (θJA = 78°C/W), fixed-output accuracy (±2% over load/temperature), and TO220-3L mounting compatibility with standard heatsinks.
Technical Context
The AP1084T15L-U implements a bandgap-referenced error amplifier driving an NPN pass transistor, enabling precise 1.5V regulation with 1.25V internal reference and 55µA adjust-pin bias current. Its architecture supports fast transient response (<100µs recovery from 0→5A step) and maintains stability with ≥10µF output capacitance (ESR 0.15–20Ω).
It operates across 0–125°C junction temperature, integrates thermal shutdown at 150°C, and enforces current limiting at 5.1A (typical) with foldback behavior above dropout. Input-to-output differential must exceed 1.4V to sustain regulation-no external compensation required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.500 V ±2% (1.47–1.53 V) at 10mA, 25°C; includes line/load/temp drift |
| Dropout Voltage | 1.4 V max at 5A load; enables 1.5V output from as low as 2.9V input supply |
| Output Current | 5.0 A continuous; limited to 5.1A typical to prevent thermal runaway |
| Thermal Resistance | θJA = 78°C/W (TO220-3L, FR-4, 2oz Cu); requires heatsink for >1.9W dissipation |
| Line Regulation | 0.2% max over VIN range (3V–12V); ensures <3mV output shift per volt input change |
| Load Regulation | 15 mV max (0–5A); guarantees ≤1% output deviation across full load range |
| Reference Voltage | 1.250 V ±2% (1.225–1.275 V); sets precision of internal feedback loop |
Pinout & Package
AP1084T15L-U uses TO220-3L package with exposed thermal tab electrically connected to VOUT pin. Mounting requires insulated hardware or thermal pad due to tab voltage.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj/GND) | Adjust/Ground terminal | Internally tied to ground in fixed-mode; no external connection required for 1.5V operation |
| 2 (VOUT) | Regulated output | 1.5V output node; also connects to thermal tab-must be isolated from chassis ground unless system common |
| 3 (VIN) | Input supply | Accepts 3–12V DC; must remain ≥1.4V above VOUT to maintain regulation; decoupling capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout at full load | 1.4V max dropout enables efficient 1.5V generation from 3.3V or 5V rails without switching loss |
| Integrated protection | Thermal shutdown (150°C) + current limiting (5.1A) prevent damage during overload or poor heatsinking |
| Stable with standard capacitors | Guaranteed stability with ≥10µF aluminum electrolytic (0.15–20Ω ESR), simplifying BOM and layout |
| Tight output tolerance | ±2% over temperature and load ensures compliance with 1.5V I/O supply specs (e.g., DDR termination) |
| Lead-free & RoHS compliant | L-suffix confirms lead-free finish and green molding compound (Br/Sb-free), meeting EU Directive 2002/95/EC |
Applications
| High-Speed Bus Termination | VGA Card Core Power |
|---|---|
|
Use Scenario: Providing stable 1.5V termination voltage for DDR2/DDR3 memory data lines on motherboard or graphics add-in cards. IC Role / Device Role / Timing Role: Fixed-output LDO supplying clean, low-noise termination reference referenced to VDDQ. Use Value: Maintains signal integrity under fast 0→5A transients with <33mV droop-meets JEDEC VTT ripple requirements. |
Use Scenario: Delivering core logic voltage to VGA controller ASICs and video DACs requiring tightly regulated 1.5V. IC Role / Device Role / Timing Role: Primary analog/digital domain regulator powering timing-critical pixel processing blocks. Use Value: 1.4V dropout allows direct use of 3.3V rail, eliminating intermediate conversion stages and reducing board area. |
| Low-Current 3.3V Logic Supply | Industrial Sensor Interface |
|
Use Scenario: Generating auxiliary 1.5V bias for level-shifting circuits between 3.3V microcontrollers and 1.8V peripherals. IC Role / Device Role / Timing Role: Secondary LDO providing isolated, noise-isolated supply for interface translation ICs. Use Value: Fast transient response (<100µs) prevents logic glitches during burst communication (e.g., SPI/I²C). |
Use Scenario: Powering precision analog front-ends (e.g., 16-bit ADCs, instrumentation amps) in factory automation sensors. IC Role / Device Role / Timing Role: Low-noise analog supply rail decoupled from digital domains to minimize PSRR-induced errors. Use Value: 0.5% temperature stability ensures <±7.5mV output drift over –40°C to +125°C ambient. |
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 |
|---|---|---|---|
| AP1084T15G-U | Same electrical specs; green molding compound (Br/Sb-free), identical TO220-3L package and pinout | No functional difference; selected when halogen-free compliance is mandated by OEM environmental policy | Direct replacement where RoHS + green compound required; same thermal performance and footprint |
| TLV1117-15CDCY | Lower current (800mA), higher dropout (1.2V @ 800mA), SOT-223 package, no thermal tab | Not suitable for 5A loads; used only in space-constrained, low-power sensor nodes or MCU peripherals | Choose only for sub-1A applications where TO220 footprint is prohibitive; not a functional substitute for AP1084T15L-U |
Compared with AP1084T15G-U, the L-suffix offers identical performance with lead-free finish; versus TLV1117-15CDCY, AP1084T15L-U provides 6.25× higher current, integrated thermal protection, and TO220 heatsink capability-critical for industrial power delivery.
Availability
AP1084T15L-U is available at Aetrix Electronics and suitable for high-speed bus termination, VGA card core power, and industrial sensor interface applications requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.
Supply support for AP1084T15L-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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The AP1084 series belongs to Diodes' high-current LDO portfolio, engineered specifically for low-voltage, high-current IC supply applications-including memory termination, graphics subsystems, and FPGA auxiliary rails-where dropout, thermal robustness, and transient response are critical.
FAQ
What is the minimum input voltage required for AP1084T15L-U to regulate at 1.5V?
The AP1084T15L-U requires VIN ≥ VOUT + 1.4V = 2.9V to maintain regulation at full 5A load. At lighter loads, dropout decreases-e.g., 1.3V at 1A-so 3.0V input is recommended for margin across temperature and line variation.
Can AP1084T15L-U be used without an output capacitor?
No. A minimum 10µF aluminum electrolytic capacitor (ESR 0.15–20Ω) is mandatory between VOUT and GND for stability and transient response. Omitting it causes oscillation and potential device failure under load steps.
Is the thermal tab of AP1084T15L-U electrically connected to any pin?
Yes-the TO220-3L thermal tab is internally connected to the VOUT pin (Pin 2). When mounting to a heatsink, electrical isolation (e.g., mica washer + thermal grease) is required unless the heatsink is referenced to 1.5V.
Does AP1084T15L-U support adjustable output configurations?
No. The "15" suffix denotes fixed 1.5V output. Adjustable versions use blank suffix (e.g., AP1084TxxL-U) and require external R1/R2 resistors on the Adj pin; this part has Adj internally grounded and cannot be reconfigured.
AP1084T15L-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):
- 1.5V
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-3
AP1084T15L-U FAQ
1.How can I place an order for AP1084T15L-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1084T15L-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 AP1084T15L-U reliable?
The price and inventory of AP1084T15L-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1084T15L-U is usually 5 days.
3.What payment methods are accepted for AP1084T15L-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1084T15L-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1084T15L-U?
AP1084T15L-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1084T15L-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 AP1084T15L-U?
For technical support, including AP1084T15L-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1084T15L-U requirements.
6.How does Aetrix verify that AP1084T15L-U is sourced from the original manufacturer or authorized distributors?
All AP1084T15L-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 AP1084T15L-U meets industry standards.
7.What is the process for return or replacement of AP1084T15L-U?
All AP1084T15L-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1084T15L-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 AP1084T15L-U part is unused and in its original packaging.
Return procedure for AP1084T15L-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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