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Diodes Incorporated AP1501-12T5L-U
- Part No.:
- AP1501-12T5L-U
- Manufacturer:
- Diodes Incorporated
- Package:
- -
- Datasheet:
-
AP1501-12T5L-U.pdf
- Description:
- IC REG BUCK 12V 3A TO220-5L
- Quantity:
- Payment:
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Inventory:3,349
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Product details
Overview
AP1501-12T5L-U from Diodes Incorporated is a fixed 12V, 3A non-synchronous PWM buck DC/DC converter in TO220-5L package, operating at 150kHz switching frequency with ±4% output voltage tolerance and integrated thermal shutdown/current limit protection. It delivers regulated 12V output from 15–40V input for industrial power rails and embedded systems requiring compact, self-contained step-down regulation.
For engineers reviewing the AP1501-12T5L-U datasheet, AP1501-12T5L-U pinout, AP1501-12T5L-U application, or AP1501-12T5L-U equivalent, this device supports high-current board-level conversion without external driver components, features logic-controlled ON/OFF shutdown, internal compensation, and operates up to 40V input - critical for ruggedized 12V supply design.
Technical Context
The AP1501-12T5L-U implements voltage-mode PWM control with a built-in 150kHz oscillator and internal 1.23V reference, enabling stable regulation across 15–40V input range. Its non-synchronous architecture uses an integrated N-channel MOSFET switch and requires an external Schottky catch diode (e.g., B340A).
Feedback is internally fixed to 12V via resistor divider network; no external FB resistor is needed. Thermal shutdown activates at TJ ≥ 150°C, and cycle-by-cycle current limiting triggers at 3.6–5.5A peak switch current, protecting against overload and short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±4% at 0.2–3A load, validated under 15–40V input |
| Switching Frequency | 150kHz ±15%, enables use of compact 47µH inductors and low-ESR output capacitors |
| Max Output Current | 3A continuous DC load, limited by internal switch saturation voltage (1.3–1.5V) and thermal design |
| Input Voltage Range | 4.5V to 40V operation, with absolute max rating of +45V on VIN pin |
| Efficiency | 90% typical at VIN=15V, IOUT=3A, enabling reduced thermal management overhead |
| Shutdown Quiescent Current | 150–350µA in OFF mode (SD pin >2.0V), supporting low-power standby states |
| Thermal Resistance | θJA = 31°C/W (TO220-5L(R)), requiring heatsink for >1.5A continuous operation at TA=85°C |
Pinout & Package
AP1501-12T5L-U is housed in a lead-free TO220-5L(R) package with exposed metal tab electrically connected to GND, optimized for vertical mounting and heatsink attachment. The tab serves as primary thermal path and must be soldered to a copper heatsink area or mounted to an external heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Positive input supply | Accepts 4.5–40V DC; requires local 100µF+ low-ESR input capacitor to suppress switching transients |
| 2 - Output | Internal N-MOSFET drain | Switches between (VIN – VSAT) and ~–0.5V; connects to inductor input; minimize PCB copper area to reduce EMI coupling |
| 3 - Gnd | Power and signal ground | Common return for VIN, FB, SD, and thermal tab; must be low-impedance connection to minimize noise and thermal resistance |
| 4 - FB | Feedback input | Internally tied to 12V divider; not user-accessible in fixed-output version; open or floating in this variant |
| 5 - SD | Shutdown control | Logic-compatible input: <1.3V = ON, >2.0V = OFF; sinks 15–25µA when pulled high; can be grounded for always-on operation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3A switch | Eliminates need for external gate driver or discrete MOSFET, reducing BOM count and layout complexity |
| Fixed 12V output | Factory-trimmed feedback network ensures ±4% accuracy without external resistors or calibration |
| Thermal shutdown | Automatically disables switching at TJ ≥ 150°C and resumes after cooldown, preventing permanent IC damage |
| Current limit protection | Peak switch current limited to 3.6–5.5A, providing robust short-circuit immunity without external sensing |
| ON/OFF logic control | Compatible with 3.3V/5V microcontroller GPIO; enables system-level power sequencing and energy-saving sleep modes |
Applications
| Industrial PLC Power Supply | Automotive Aftermarket Camera Module |
|---|---|
Use Scenario: Providing clean, regulated 12V rail to programmable logic controllers in factory automation cabinets with wide-input 24VDC bus. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 24V bus to stable 12V for I/O modules and communication interfaces. Use Value: Delivers 3A continuous current with 90% efficiency, minimizing heat buildup inside sealed enclosures and eliminating need for external current-sense circuitry. | Use Scenario: Powering CMOS image sensors and video processors in rear-view or surround-view camera systems powered from vehicle 12V battery (9–16V nominal, up to 40V load dump). IC Role / Device Role / Timing Role: Input-tolerant step-down regulator maintaining 12V output during cold-crank and load-dump transients. Use Value: Withstands 40V absolute max input and includes thermal/current protection - critical for unregulated automotive environments without additional TVS or fuse coordination. |
| Point-of-Sale Terminal Power | Network Edge Router Board |
Use Scenario: Generating 12V for thermal printers, magnetic stripe readers, and display backlights in compact retail terminals using universal AC/DC adapters (12–24V DC output). IC Role / Device Role / Timing Role: High-current local DC/DC stage replacing linear regulators to improve efficiency and reduce board temperature rise. Use Value: Reduces power loss by >70% vs. linear solution at 3A, enabling fanless operation and extending component lifetime in thermally constrained enclosures. | Use Scenario: Supplying 12V to PoE midspan controllers, PHY transceivers, and fan drivers on enterprise router line cards with shared 48V intermediate bus. IC Role / Device Role / Timing Role: Secondary buck stage delivering isolated 12V domain from centralized 48V supply, supporting hot-swap and sequencing requirements. Use Value: Logic-controlled SD pin allows firmware-coordinated power-up/down of 12V subsystems, improving system-level power management granularity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576HVS-12 | 5-pin TO220, 3A, 52kHz fixed-frequency, requires external diode and compensation; ±4% VOUT tolerance | Lower switching frequency increases inductor size; less efficient at light loads due to higher quiescent current (5.5mA vs. 150µA) | Select if legacy design compatibility or lower EMI sensitivity is prioritized over board space and standby power |
| MP1584EN-LF-Z | SOT-23-8, 3A, 1.5MHz adjustable/fixed, requires external feedback resistors even in fixed versions; ±2% VOUT tolerance | Higher frequency enables smaller magnetics but demands tighter layout control; no integrated thermal shutdown (relies on external thermal foldback) | Select for space-constrained designs where 1.5MHz operation justifies added layout complexity and external component count |
Compared with LM2576HVS-12 and MP1584EN-LF-Z, the AP1501-12T5L-U offers superior standby current (150µA), integrated thermal shutdown, and fixed 12V configuration without external resistors - simplifying qualification and reducing risk of feedback network errors in high-volume production.
Availability
AP1501-12T5L-U is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive camera modules, point-of-sale terminals, and network edge routers requiring stable component supply with full RoHS compliance and green molding compound.
Supply support for AP1501-12T5L-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 automotive markets.
The AP1501 product line delivers fully integrated, cost-optimized buck converters targeting board-level DC/DC conversion in space- and thermal-constrained applications where simplicity, ruggedness, and long-term supply stability are essential.
FAQ
What is the maximum allowable input voltage for AP1501-12T5L-U?
The absolute maximum input voltage is +45V on the VIN pin, but recommended operating range is 15–40V for 12V output. Operation above 40V risks exceeding internal transistor breakdown limits and voids parametric guarantees; transient spikes beyond 45V may cause irreversible damage even with short duration.
Can AP1501-12T5L-U be used without a heatsink?
At ambient temperatures ≤50°C and output current ≤1.2A, the TO220-5L(R) package can operate without an external heatsink when mounted on ≥2 in² of 2 oz copper. Above 1.5A or at TA >60°C, a heatsink is mandatory to maintain junction temperature below 125°C - verified by thermal simulation using θJA = 31°C/W and θJC = 5°C/W.
Is an external catch diode required, and what type is recommended?
Yes, an external Schottky diode is mandatory. Diodes Incorporated specifies B340A or PDS340 series: 40V VRRM, 3A IF, ≤0.5V VF at 3A. Using a slower or higher-VF diode degrades efficiency, increases thermal stress on both diode and AP1501, and may trigger premature current-limit shutdown under transient loads.
Does AP1501-12T5L-U support output voltage adjustment?
No - the "12" in the part number denotes factory-trimmed fixed 12V output. The FB pin is internally connected to the 12V divider network and is not accessible for external adjustment. For adjustable output, select AP1501-ADJT5L-U and use external R1/R2 per VOUT = 1.23V × (1 + R2/R1).
AP1501-12T5L-U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
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- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
AP1501-12T5L-U FAQ
1.How can I place an order for AP1501-12T5L-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1501-12T5L-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 AP1501-12T5L-U reliable?
The price and inventory of AP1501-12T5L-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1501-12T5L-U is usually 5 days.
3.What payment methods are accepted for AP1501-12T5L-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1501-12T5L-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1501-12T5L-U?
AP1501-12T5L-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1501-12T5L-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 AP1501-12T5L-U?
For technical support, including AP1501-12T5L-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1501-12T5L-U requirements.
6.How does Aetrix verify that AP1501-12T5L-U is sourced from the original manufacturer or authorized distributors?
All AP1501-12T5L-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 AP1501-12T5L-U meets industry standards.
7.What is the process for return or replacement of AP1501-12T5L-U?
All AP1501-12T5L-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1501-12T5L-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 AP1501-12T5L-U part is unused and in its original packaging.
Return procedure for AP1501-12T5L-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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