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Diodes Incorporated AP1501-33K5L-13
- Part No.:
- AP1501-33K5L-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
AP1501-33K5L-13.pdf
- Description:
- IC REG BUCK 3.3V 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,606
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Product details
Overview
AP1501-33K5L-13 from Diodes Incorporated is a fixed-output 3.3V, 3A non-synchronous PWM buck DC/DC converter in TO263-5L package, operating at 150kHz switching frequency with integrated power switch, thermal shutdown, and ON/OFF control. It delivers ±4% output voltage accuracy across 4.75–40V input range and supports industrial embedded power rails requiring compact, cost-effective step-down regulation.
For engineers reviewing the AP1501-33K5L-13 datasheet, AP1501-33K5L-13 pinout, AP1501-33K5L-13 application, or AP1501-33K5L-13 equivalent, key selection criteria include its 3A load capability, 3.3V fixed output, TO263-5L thermal performance (θJA = 37°C/W), shutdown quiescent current of 150–350µA, and compatibility with standard Schottky catch diodes like B340A.
Technical Context
The AP1501-33K5L-13 implements voltage-mode PWM control with internal 1.23V reference and feedback amplifier, enabling stable regulation without external compensation. Its fixed 3.3V output is achieved via internal resistor divider, eliminating external FB network components.
Thermal shutdown activates at TJ ≥ 150°C, and cycle-by-cycle current limiting triggers at 3.6–5.5A peak switch current. The ON/OFF pin accepts logic-level signals (VIH ≥ 2.0V for shutdown, VIL ≤ 1.3V for enable) and draws only 15–25µA when active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±4% over 0.2–3A load and -20°C to +85°C ambient |
| Max Output Current | 3A continuous; limited by internal switch saturation (VSAT = 1.3–1.5V @ 3A) |
| Switching Frequency | 150kHz ±15%; enables use of 33µH inductor and reduces EMI filtering burden |
| Input Voltage Range | 4.75V to 40V; supports wide-input industrial and automotive battery-derived supplies |
| Efficiency | 73% at VIN = 12V, IOUT = 3A; optimized for mid-load efficiency in distributed power systems |
| Shutdown Current | 150–350µA; enables low-power standby mode for battery-backed or energy-sensitive designs |
| Thermal Resistance | θJA = 37°C/W (TO263-5L, 3in² copper); requires PCB copper area ≥0.4in² for safe 3A operation |
Pinout & Package
AP1501-33K5L-13 uses the TO263-5L surface-mount package with exposed metal tab connected to GND for thermal conduction. The package is RoHS-compliant, lead-free, and uses green molding compound (no Br/Sb).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power input | Accepts 4.75–40V; requires local ceramic bypass capacitor to handle high di/dt switching currents |
| 2 - Output | Switch node | Drives external inductor; swings between (VIN – VSAT) and ~–0.5V; minimize copper area to reduce EMI coupling |
| 3 - Gnd | Power and signal ground | Common return for internal circuitry and thermal path; connects to exposed metal tab |
| 4 - FB | Feedback input | Internally tied to 3.3V divider; unused in fixed-output version but must remain unconnected |
| 5 - SD | Shutdown control | Logic-compatible input: <1.3V = ON, >2.0V = OFF; 15–25µA input current enables direct MCU GPIO drive |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3A power switch | Eliminates external MOSFET driver and gate resistor; reduces BOM count and layout complexity |
| Voltage-mode PWM control | Provides predictable loop response and simplifies stability analysis vs. current-mode alternatives |
| Thermal shutdown + current limit | Protects against sustained overload or poor heatsinking without external sensing circuitry |
| ON/OFF logic interface | Enables system-level power sequencing and sleep-mode coordination using standard 3.3V/5V logic |
| Lead-free TO263-5L package | Supports automated reflow assembly and meets RoHS Directive 2002/95/EC with green compound |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Powering isolated digital I/O drivers and analog sensor interfaces in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 3.3V rail generator from 24V DC bus, delivering regulated power to microcontroller peripherals and level-shifted communication ICs. Use Value: Delivers 3A at 3.3V with ±4% tolerance and 73% efficiency, enabling compact board design without external pass transistor or LDO post-regulation. | Use Scenario: Supplying 3.3V logic power to CAN transceivers, LIN interface ICs, and microcontroller subsystems in vehicle door modules. IC Role / Device Role / Timing Role: Buck regulator converting 12V battery supply to stable 3.3V under cold-crank (6.5V) and load-dump (40V) conditions. Use Value: Operates across 4.75–40V input range with built-in overvoltage protection, supporting full automotive battery transient compliance without external clamping. |
| Point-of-Load Telecom Converters | Medical Diagnostic Instrumentation |
Use Scenario: Generating local 3.3V supply for FPGA configuration memory, Ethernet PHYs, and clock buffers on telecom line cards. IC Role / Device Role / Timing Role: High-current point-of-load regulator placed near load to minimize IR drop and noise coupling in dense backplane systems. Use Value: 150kHz fixed frequency allows predictable EMI filter design and avoids sensitive RF bands; TO263-5L thermal performance supports 3A in constrained airflow environments. | Use Scenario: Providing clean 3.3V power to ADC front-ends, optical sensor interfaces, and low-noise amplifiers in portable ultrasound or patient monitoring devices. IC Role / Device Role / Timing Role: Primary DC/DC stage feeding low-dropout regulators that supply ultra-low-noise analog circuitry. Use Value: Fixed 3.3V output eliminates FB resistor tolerance errors; ±4% accuracy ensures consistent ADC reference scaling and sensor biasing across temperature. |
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 |
|---|---|---|---|
| LM2596S-3.3/NOPB | 3A, 150kHz, fixed 3.3V; TO263-5 package; no SD pin; ±4% output tolerance | Lacks ON/OFF control; requires external shutdown circuitry for system power sequencing | Select when shutdown functionality is unnecessary and legacy LM2596 footprint compatibility is required |
| MP1584EN-LF-Z | 3A, 1.5MHz, adjustable/fixed versions; SOIC-8; includes soft-start; ±2% output tolerance | Higher switching frequency enables smaller magnetics but increases EMI sensitivity and gate drive losses | Select when board space is critical and higher-frequency layout constraints can be managed |
Compared with LM2596S-3.3/NOPB, AP1501-33K5L-13 adds logic-controlled shutdown and tighter thermal management via TO263-5L tab grounding; versus MP1584EN-LF-Z, it trades higher frequency for lower EMI and simpler magnetics design at the cost of larger inductors.
Availability
AP1501-33K5L-13 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and point-of-load telecom converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AP1501-33K5L-13 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 power management, signal integrity, and protection solutions for industrial, automotive, and consumer markets.
The AP1501 product line delivers cost-optimized, integrated buck regulators targeting high-reliability embedded power conversion where simplicity, thermal robustness, and fixed-output precision are prioritized over programmability or ultra-high efficiency.
FAQ
What is the minimum input voltage required for AP1501-33K5L-13 to regulate 3.3V output?
The AP1501-33K5L-13 requires a minimum input voltage of 4.75V to maintain regulation at 3.3V output across its full 0.2–3A load range and -20°C to +85°C ambient temperature. Below this threshold, dropout occurs and output voltage collapses proportionally to input.
Can the AP1501-33K5L-13 be used with an input voltage up to 40V continuously?
Yes - the AP1501-33K5L-13 supports continuous operation at up to 40V input, with absolute maximum rating of +45V. At 40V input and 3A output, thermal design must ensure junction temperature remains ≤125°C using the TO263-5L's 37°C/W θJA with ≥3in² copper area.
Is an external catch diode required, and what type is recommended?
Yes - an external Schottky catch diode is mandatory. Diodes Incorporated recommends B340A or PDS340 series: 40V reverse voltage, 3A average current, low forward voltage (<0.5V), and fast recovery to minimize conduction loss and reverse recovery spikes in the buck topology.
Does the AP1501-33K5L-13 require external compensation components?
No - the AP1501-33K5L-13 features fully internal compensation for voltage-mode control. No external capacitors or resistors are needed on the FB pin or elsewhere; the fixed 3.3V version leaves FB unconnected, and the internal loop is factory-tuned for stability with standard 33µH inductors and electrolytic/ceramic output capacitors.
AP1501-33K5L-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-5
AP1501-33K5L-13 FAQ
1.How can I place an order for AP1501-33K5L-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1501-33K5L-13 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 AP1501-33K5L-13 reliable?
The price and inventory of AP1501-33K5L-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1501-33K5L-13 is usually 5 days.
3.What payment methods are accepted for AP1501-33K5L-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1501-33K5L-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1501-33K5L-13?
AP1501-33K5L-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1501-33K5L-13 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 AP1501-33K5L-13?
For technical support, including AP1501-33K5L-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1501-33K5L-13 requirements.
6.How does Aetrix verify that AP1501-33K5L-13 is sourced from the original manufacturer or authorized distributors?
All AP1501-33K5L-13 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 AP1501-33K5L-13 meets industry standards.
7.What is the process for return or replacement of AP1501-33K5L-13?
All AP1501-33K5L-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1501-33K5L-13, 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 AP1501-33K5L-13 part is unused and in its original packaging.
Return procedure for AP1501-33K5L-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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