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Diodes Incorporated AP1501A-33T5L-U
- Part No.:
- AP1501A-33T5L-U
- Manufacturer:
- Diodes Incorporated
- Package:
- -
- Datasheet:
-
AP1501A-33T5L-U.pdf
- Description:
- IC CONV DC-DC 5A 3.3V TO220-5L
- Quantity:
- Payment:
- Shipping:
Inventory:174
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Product details
Overview
AP1501A-33T5L-U from Diodes Incorporated is a fixed-output 3.3V, 150kHz PWM buck DC/DC converter IC with integrated 5A switch, thermal shutdown, and logic-controlled ON/OFF shutdown. It operates from 4.5V to 40V input, delivers ±4% output voltage accuracy at 5A load, and uses TO220-5 package for high-power industrial step-down regulation in embedded power supplies.
For engineers reviewing the AP1501A-33T5L-U datasheet, AP1501A-33T5L-U pinout, AP1501A-33T5L-U application, or AP1501A-33T5L-U equivalent, key selection criteria include its fixed 3.3V output, 150kHz switching frequency, internal current limit (6.0A typ), thermal protection, and SD pin logic-level shutdown capability - all critical for reliable, space-constrained 5A buck designs.
Technical Context
The AP1501A-33T5L-U implements voltage-mode non-synchronous PWM control with an internal 1.23V reference and built-in compensation network, enabling stable regulation without external loop components. Its oscillator runs at 150kHz ±15%, directly determining minimum inductor size and filter capacitor requirements.
It integrates a 5A DMOS power switch with 1.6V typical saturation voltage at full load, and features dedicated FB and SD pins for precise output feedback and logic-compatible enable/disable control. Thermal shutdown activates at junction temperatures exceeding +125°C, while cycle-by-cycle current limiting protects against overloads up to 6.5A peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% (3.168V–3.432V) under 0.2A–5A load and 5.5V–40V input - ensures stable core logic rail for microcontrollers and FPGAs. |
| Switching Frequency | 150kHz ±15% - enables use of compact 18µH inductors and reduces EMI compared to lower-frequency alternatives. |
| Max Output Current | 5A continuous - supports high-current digital subsystems without external MOSFETs or complex current sharing. |
| Saturation Voltage | 1.6V typical at 5A - defines conduction loss and impacts thermal design; requires heatsink for sustained operation above ambient +60°C. |
| Input Voltage Range | 4.5V to 40V - accommodates wide-input industrial, automotive, and telecom power buses including 12V, 24V, and 36V nominal systems. |
| Shutdown Quiescent Current | 250µA max at VIN = 40V - enables ultra-low-power standby mode for battery-backed or energy-sensitive applications. |
| Thermal Shutdown Threshold | +125°C junction temperature - provides fail-safe protection during overload or inadequate heatsinking conditions. |
Pinout & Package
AP1501A-33T5L-U uses the TO220-5 package with exposed metal tab connected internally to GND. The tab serves as primary thermal path and must be mounted to a heatsink for reliable 5A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN | Power input supply | Accepts 4.5V–40V DC; requires low-ESR input capacitor (≥100µF) near pin to suppress switching transients. |
| 2: Output | Switching node | Drives external catch diode and inductor; voltage swings between VIN–VSAT and ~–0.5V; minimal copper area recommended to reduce EMI coupling. |
| 3: GND | Ground reference | Common return for power, feedback, and shutdown paths; connects to metal tab; must be low-impedance plane for stability and thermal performance. |
| 4: FB | Feedback input | Monitors output via resistive divider; internal 1.23V reference sets regulation point; open-circuit or short to GND disables regulation. |
| 5: SD | Shutdown control | Logic-level input: <1.3V = ON, >2.0V = OFF; sinks ≤25µA when active; tied to GND for always-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 5A Power Switch | Eliminates need for external MOSFET and gate driver, reducing BOM count and PCB footprint in 3.3V/5A buck designs. |
| Internal Compensation Network | Enables stable loop response with only two external components (inductor + output capacitor), simplifying layout and validation. |
| Logic-Compatible Shutdown (SD) | Supports direct interface with MCU GPIO or system power sequencer without level-shifting, enabling controlled power-up/down sequencing. |
| Thermal & Current Protection | Combines cycle-by-cycle current limit (6.0A typ) and junction-based thermal shutdown to prevent damage during fault conditions. |
| Fixed 3.3V Output Accuracy | ±4% tolerance across full temperature and load range ensures compliance with 3.3V I/O and core supply specifications for modern digital ICs. |
Applications
| Industrial PLC Power Supply | Embedded Controller Core Rail |
|---|---|
|
Use Scenario: Step-down conversion from 24V DC bus to clean 3.3V for PLC CPU, I/O modules, and communication interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 3.3V at up to 5A with thermal protection during transient overloads. Use Value: Eliminates discrete switch + controller complexity while maintaining ±4% output accuracy across –20°C to +85°C ambient. |
Use Scenario: Local regulation for ARM Cortex-M7 or RISC-V SoC core voltage in edge gateway hardware. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter delivering stable 3.3V at 5A with 150kHz switching compatible with standard 18µH shielded inductors. Use Value: Internal compensation and integrated switch reduce design risk and accelerate time-to-test for production-grade embedded boards. |
| Point-of-Load Telecom Module | Automotive Body Control Unit |
|
Use Scenario: Secondary 3.3V rail generation from 12V vehicle battery or 48V telecom backplane in compact module form factor. IC Role / Device Role / Timing Role: High-current buck regulator with SD pin enabling synchronized power sequencing with baseband processor or FPGA. Use Value: 250µA standby current and 40V max input support cold-crank and load-dump conditions per ISO 7637-2. |
Use Scenario: Powering CAN transceivers, sensor interfaces, and microcontroller peripherals in BCM or door module. IC Role / Device Role / Timing Role: Robust 3.3V supply with thermal shutdown and current limit protecting against short-circuit faults in harsh automotive environments. Use Value: TO220-5 package allows direct mounting to metal chassis for passive cooling, meeting AEC-Q100-relevant thermal reliability targets. |
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 |
|---|---|---|---|
| MP1584EN-LF-Z (Monolithic Power) | 40V input, 3A output, 1.5MHz switching, adjustable output only - requires external resistor divider for 3.3V. | Lacks fixed 3.3V option; higher frequency enables smaller magnetics but increases EMI filtering complexity. | Choose if board space is constrained and 3A suffices; avoid if 5A output or fixed-voltage simplicity is required. |
| LM2596S-3.3 (Texas Instruments) | 40V input, 3A output, 150kHz, fixed 3.3V - same topology but lower current rating and no SD pin. | No logic-controlled shutdown; thermal shutdown only; less robust current limit (3.5A typ). | Acceptable for <3A loads where SD functionality is unused; not suitable for 5A industrial applications requiring active sequencing. |
Compared with MP1584EN-LF-Z and LM2596S-3.3, the AP1501A-33T5L-U uniquely delivers 5A at fixed 3.3V with integrated shutdown control and proven thermal margin in TO220-5 - making it the only viable drop-in solution for legacy 5A buck designs requiring no redesign.
Availability
AP1501A-33T5L-U is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded controller core rails, and automotive body control units requiring stable component supply and long-term manufacturability.
Supply support for AP1501A-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 analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial and automotive markets.
The AP1501A series belongs to Diodes' monolithic DC/DC converter product line, designed specifically for cost-sensitive, high-current step-down applications where integration, thermal robustness, and fixed-output simplicity are prioritized over programmability.
FAQ
Is AP1501A-33T5L-U still in production?
No - per Diodes Incorporated's ordering information (DS31191 Rev. 11-2), AP1501A-33T5L-U is marked "End of Life" with no direct replacement. Aetrix Electronics maintains limited legacy stock for ongoing production support, and recommends AP1501A-33K5G-13 (TO263-5) as the closest functionally identical alternative with active status and 800-unit reel packaging.
What heatsink is required for 5A continuous operation?
For TO220-5 package operation at 5A and 12V input → 3.3V output, Diodes specifies θJA = 31°C/W. With 1.6V saturation loss (8W dissipation) and 85°C max ambient, junction temperature reaches ~110°C - within spec. A 2°C/W extruded aluminum heatsink (e.g., Aavid 5300BG) is recommended for safety margin and extended life.
Can AP1501A-33T5L-U be used in adjustable-output configurations?
No - the "-33" suffix denotes factory-trimmed fixed 3.3V output. The FB pin remains functional for monitoring, but internal reference is hardwired to 3.3V; attempting to adjust output via external resistors will cause regulation failure. Use AP1501A-T5G-U (adjustable version) instead for programmable outputs from 1.23V to 37V.
Does the SD pin support active-low or active-high logic?
The SD pin is active-high: applying ≥2.0V shuts down the regulator (standby mode, IQ ≈ 250µA); applying ≤1.3V enables normal operation. It does not support active-low logic without an inverter. For MCU GPIO compatibility, connect SD directly to a push-pull output - no pull-up/pull-down resistors needed.
AP1501A-33T5L-U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tube
- 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:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
AP1501A-33T5L-U FAQ
1.How can I place an order for AP1501A-33T5L-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1501A-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 AP1501A-33T5L-U reliable?
The price and inventory of AP1501A-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 AP1501A-33T5L-U is usually 5 days.
3.What payment methods are accepted for AP1501A-33T5L-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1501A-33T5L-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1501A-33T5L-U?
AP1501A-33T5L-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1501A-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 AP1501A-33T5L-U?
For technical support, including AP1501A-33T5L-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1501A-33T5L-U requirements.
6.How does Aetrix verify that AP1501A-33T5L-U is sourced from the original manufacturer or authorized distributors?
All AP1501A-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 AP1501A-33T5L-U meets industry standards.
7.What is the process for return or replacement of AP1501A-33T5L-U?
All AP1501A-33T5L-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1501A-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 AP1501A-33T5L-U part is unused and in its original packaging.
Return procedure for AP1501A-33T5L-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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