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Diodes Incorporated AP1501-33T5L-U
- Part No.:
- AP1501-33T5L-U
- Manufacturer:
- Diodes Incorporated
- Package:
- -
- Datasheet:
-
AP1501-33T5L-U.pdf
- Description:
- IC CONV DC-DC 3A 3.3V TO220-5L
- Quantity:
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Inventory:139
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Product details
Overview
AP1501-33T5L-U from Diodes Incorporated is a fixed-output 3.3V, 3A non-synchronous PWM buck DC/DC converter with 150 kHz switching frequency, integrated power switch, thermal shutdown, and ON/OFF control. It operates from 4.5 V to 40 V input, delivers ±4% output voltage accuracy at full load, and uses TO220-5L package for industrial power regulation in embedded systems.
For engineers reviewing the AP1501-33T5L-U datasheet, AP1501-33T5L-U pinout, AP1501-33T5L-U application, or AP1501-33T5L-U equivalent, key selection factors include its fixed 3.3V output, 3A continuous load capability, built-in current limiting (4.0 A typ), thermal protection, and compatibility with standard external catch diodes like B340A in compact buck designs.
Technical Context
The AP1501-33T5L-U implements voltage-mode PWM control with internal 1.235 V reference and feedback amplifier, enabling stable regulation without external compensation. Its oscillator is trimmed to 150 kHz ±15%, supporting small external inductors (e.g., 33 µH) and capacitors while maintaining efficiency across 0.2–3 A loads.
It integrates a 3A N-channel DMOS power switch with 1.4 V typical saturation voltage at full load, and features logic-level ON/OFF control with 1.3 V low-threshold activation. Thermal shutdown triggers at 150 °C junction temperature, and current limit is internally set to 4.0 A typical, independent of external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over 0.2–3 A load and -20°C to +85°C ambient |
| Max Output Current | 3 A continuous; internal current limit protects switch at 4.0 A typical peak |
| Switching Frequency | 150 kHz ±15%; enables use of low-cost, small-footprint 33 µH inductors |
| Input Voltage Range | 4.5 V to 40 V; supports wide-input industrial and automotive battery-derived rails |
| Efficiency | 73% at VIN = 12 V, IOUT = 3 A; optimized for mid-power step-down with minimal external parts |
| Quiescent Current | 10 mA typical in active mode; drops to 250 µA in shutdown via SD pin |
| Thermal Protection | Internal thermal shutdown activates at TJ ≈ 150 °C; auto-recovery on cooldown |
Pinout & Package
AP1501-33T5L-U is housed in a lead-free TO220-5L package with exposed metal tab electrically connected to GND for thermal conduction and mechanical mounting. The tab must be soldered to a heatsink or large copper pour for reliable 3A operation at elevated ambient temperatures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – VIN | Power input | Accepts 4.5–40 V DC; requires local 100 µF+ low-ESR input capacitor |
| 2 – Output | Switch node | Drives external catch diode and LC filter; high dV/dt node-minimize trace area |
| 3 – Gnd | Power and signal ground | Common return for VIN, FB, SD, and thermal tab; star-ground layout recommended |
| 4 – FB | Feedback sense | Internally tied to 3.3 V output; not accessible in fixed-version-no external resistor needed |
| 5 – SD | Shutdown control | Logic-compatible input: <1.3 V = ON, >2.0 V = OFF; sinks 25 µA when pulled high |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3A power switch | Eliminates need for external MOSFET driver; reduces BOM count and layout complexity |
| Fixed 3.3 V output | Removes external feedback resistors-simplifies design and improves production yield |
| ON/OFF logic control | Enables system-level power sequencing and low-power standby modes with <250 µA quiescent draw |
| Thermal + current protection | Prevents latch-up or destruction during overload, short-circuit, or poor heatsinking conditions |
| Lead-free TO220-5L package | RoHS-compliant, green molding compound; compatible with standard through-hole reflow or wave soldering |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering microcontroller, CAN transceiver, and sensor interface circuitry from 12 V vehicle battery or 24 V industrial rail. IC Role / Device Role / Timing Role: Primary 3.3 V point-of-load regulator delivering clean, regulated supply to digital logic and analog peripherals. Use Value: Delivers 3 A continuously with 73% efficiency at 12 V input, reducing heat generation versus linear regulators and simplifying thermal design with TO220 heatsink integration. | Use Scenario: Supplying 3.3 V to infotainment MCU, EEPROM, and display drivers in harsh under-hood or dashboard environments. IC Role / Device Role / Timing Role: Robust DC/DC step-down stage tolerant of 40 V load-dump transients and wide ambient temperature range (-20°C to +85°C). Use Value: Built-in thermal shutdown and current limit ensure safe operation during sustained overloads or cooling failure, meeting automotive reliability requirements without external protection circuitry. |
| Network Edge Router Board | Medical Diagnostic Handheld |
Use Scenario: Generating 3.3 V for FPGA configuration, Ethernet PHY, and management MCU on space-constrained telecom line cards. IC Role / Device Role / Timing Role: High-current, fixed-output buck regulator minimizing component count and PCB footprint in multi-rail power architectures. Use Value: 150 kHz switching allows use of compact 33 µH shielded inductors and ceramic output capacitors, reducing board area versus lower-frequency alternatives. | Use Scenario: Providing isolated 3.3 V rail for low-noise ADC, touch controller, and Bluetooth LE SoC in battery-powered diagnostic tools. IC Role / Device Role / Timing Role: Main system regulator operating from Li-ion or 2-cell alkaline input, supporting ON/OFF control for power cycling between measurements. Use Value: 250 µA shutdown current extends battery life significantly; ±4% output tolerance ensures consistent ADC reference and digital logic timing margins. |
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 |
|---|---|---|---|
| LM2596-3.3 | Same 3.3 V fixed output, 3 A rating, but 150 kHz frequency and no integrated SD pin logic control | Lacks dedicated shutdown pin-requires external transistor or pull-down for enable/disable | Choose if SD functionality is unnecessary and legacy LM2596 footprint compatibility is required |
| MP1584EN-LF-Z | Higher 1.5 MHz switching frequency, smaller external components, but only 3 A peak (not continuous) and no thermal shutdown flag | Better suited for ultra-compact designs; less robust under sustained overload or high ambient temperature | Prefer for size-constrained consumer devices where thermal margin is controlled, not for industrial or automotive duty cycles |
Compared with LM2596-3.3 and MP1584EN-LF-Z, the AP1501-33T5L-U provides verified 3 A continuous output with integrated thermal shutdown and logic-level ON/OFF control-critical for industrial reliability and system-level power management without added discrete components.
Availability
AP1501-33T5L-U is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and network edge router boards requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole power solutions.
Supply support for AP1501-33T5L-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 ICs, specializing in power management, signal integrity, and protection solutions for industrial, computing, and automotive markets.
The AP1501 product line delivers cost-optimized, fully integrated buck converters targeting mid-power (1–5 W) applications where simplicity, reliability, and thermal robustness outweigh ultra-high-frequency or synchronous efficiency demands.
FAQ
What is the minimum input voltage required for AP1501-33T5L-U to regulate 3.3 V at full 3 A load?
The AP1501-33T5L-U requires a minimum input voltage of 4.5 V to maintain regulation at 3.3 V output and 3 A load, per the Recommended Operating Conditions table. Below this, dropout occurs and output collapses; the device does not operate in LDO mode. Input ripple must also stay above 4.5 V peak-to-trough to avoid intermittent regulation loss.
Can AP1501-33T5L-U be used with an external synchronous rectifier to improve efficiency?
No-the AP1501-33T5L-U is a non-synchronous buck controller with an integrated N-channel power switch and requires an external Schottky catch diode (e.g., B340A). It lacks gate drive outputs or timing control for synchronous FETs. Replacing the diode with a MOSFET without proper gate timing will cause shoot-through and device failure.
Is the metal tab on the TO220-5L package electrically connected, and what is its potential?
Yes-the metal tab is internally connected to Pin 3 (GND) and must be thermally and electrically tied to system ground. It serves as both the primary heat path and a low-impedance ground return. Isolating the tab (e.g., with insulating washer) degrades thermal performance and risks floating ground potential, leading to instability or EMI issues.
Does AP1501-33T5L-U require external compensation components for stability?
No-internal compensation is fully integrated and optimized for standard 33 µH inductor and 100–220 µF output capacitor configurations. The fixed 3.3 V version has no feedback resistor divider, eliminating tuning variables. Stability is guaranteed across the full operating range without external RC networks, per the Typical Application Circuit (1) in the datasheet.
AP1501-33T5L-U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
AP1501-33T5L-U FAQ
1.How can I place an order for AP1501-33T5L-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1501-33T5L-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 AP1501-33T5L-U reliable?
The price and inventory of AP1501-33T5L-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1501-33T5L-U is usually 5 days.
3.What payment methods are accepted for AP1501-33T5L-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1501-33T5L-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1501-33T5L-U?
AP1501-33T5L-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1501-33T5L-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 AP1501-33T5L-U?
For technical support, including AP1501-33T5L-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1501-33T5L-U requirements.
6.How does Aetrix verify that AP1501-33T5L-U is sourced from the original manufacturer or authorized distributors?
All AP1501-33T5L-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 AP1501-33T5L-U meets industry standards.
7.What is the process for return or replacement of AP1501-33T5L-U?
All AP1501-33T5L-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1501-33T5L-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 AP1501-33T5L-U part is unused and in its original packaging.
Return procedure for AP1501-33T5L-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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