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Diodes Incorporated AP1512A-33K5L-U
- Part No.:
- AP1512A-33K5L-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
AP1512A-33K5L-U.pdf
- Description:
- IC REG BUCK 3.3V 3A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,519
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Product details
Overview
AP1512A-33K5L-U from Diodes Incorporated is a monolithic 50 kHz non-synchronous PWM buck DC/DC converter with integrated 3 A switch, fixed 3.3 V output, TO263-5L package, and logic-level ON/OFF shutdown control-designed for high-efficiency step-down regulation in industrial power supplies and embedded systems requiring up to 3 A load current at 3.3 V.
For engineers reviewing the AP1512A-33K5L-U datasheet, AP1512A-33K5L-U pinout, AP1512A-33K5L-U application, or AP1512A-33K5L-U equivalent, this page delivers verified technical context, validated pin functions, real-world thermal and efficiency behavior, and precise alternative selection guidance for 3.3 V, 3 A buck conversion designs.
Technical Context
The AP1512A-33K5L-U implements voltage-mode PWM control with internal 1.235 V reference and fixed 50 kHz ±15% oscillator, enabling stable regulation without external compensation. Its integrated N-channel MOSFET switch supports 3 A peak current and operates across 4.5–60 V input range.
Thermal shutdown (125 °C typical) and cycle-by-cycle current limiting (3.2–6 A) protect against overtemperature and overload. The feedback pin (FB) is internally tied to the 3.3 V output divider, eliminating external resistor networks for fixed-output operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% (3.168–3.465 V) under 0.2–2 A load, 10–60 V input |
| Switch Current Rating | 3 A continuous output (AP1512A variant), enabling single-chip 3.3 V/3 A buck conversion |
| Switching Frequency | 50 kHz ±15% (40–60 kHz), allowing use of low-cost, high-inductance chokes (e.g., 33–47 µH) |
| Input Voltage Range | 4.5 V to 60 V - supports wide-input industrial, automotive, and telecom power rails |
| Efficiency | 80% typical at VIN = 30 V, VOUT = 3.3 V, IOUT = 3 A - optimized for mid-power fixed-output applications |
| Shutdown Quiescent Current | 350 µA max at VIN = 60 V - enables ultra-low-power standby in battery-backed or energy-sensitive systems |
| Thermal Resistance | θJC = 3.5 °C/W (junction-to-case); requires ≥0.4 in² PCB copper area for safe 3 A operation at 85 °C ambient |
Pinout & Package
AP1512A-33K5L-U uses the TO263-5L surface-mount package with exposed metal tab (GND-connected) for thermal conduction. Pin layout is standardized per Diodes Inc. AP02001 pad design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Positive input supply rail | Accepts 4.5–60 V; requires local 1 µF ceramic bypass capacitor to suppress switching transients |
| OUTPUT (Pin 2) | Internal switch drain node | Swings between ~VIN–1.5 V (ON) and –0.5 V (OFF); connects directly to inductor and catch diode anode |
| GND (Pin 3) | Power and signal ground reference | Shared return path for IC core, switch, and feedback; must be low-impedance connection to PCB ground plane |
| FB (Pin 4) | Feedback input (internally connected) | Internally tied to 3.3 V output divider - no external resistors required for fixed-output operation |
| SD (Pin 5) | Logic-level shutdown control | Pull ≤1.3 V to enable regulator; pull ≥2.0 V to disable (ISD < ±10 µA); open or grounded = always ON |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3 A power switch | Eliminates external MOSFET and gate driver - reduces BOM count and board space in 3.3 V/3 A buck designs |
| Fixed 3.3 V output with trimmed tolerance | ±4% output accuracy over full temperature and line/load range - meets tight logic supply requirements without trimming |
| Internal compensation network | Enables stable loop response with no external compensation components - simplifies design and improves reliability |
| Thermal shutdown + current limit protection | Prevents device failure during overload or poor heatsinking - critical for unattended industrial deployments |
| Lead-free, RoHS-compliant TO263-5L package | Surface-mount package with GND tab for direct PCB thermal coupling - supports automated assembly and IPC Class 2/3 compliance |
Applications
| Industrial PLC Power Supply | Embedded System Core Rail |
|---|---|
|
Use Scenario: Providing clean 3.3 V power to microcontroller, FPGA, and interface ICs on a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated 3.3 V at up to 3 A from a 24 V DC bus. Use Value: Integrated switch and thermal protection ensure reliable operation in high-ambient-temperature enclosures without forced airflow. |
Use Scenario: Generating main 3.3 V supply for ARM-based edge computing modules operating from 12–48 V field power. IC Role / Device Role / Timing Role: Fixed-output buck converter with logic-controlled shutdown for low-power sleep states. Use Value: 350 µA standby current and wide input range simplify power architecture while meeting IEC 61000-4 immunity requirements. |
| Telecom Remote Radio Unit | Automotive Body Control Module |
|
Use Scenario: Converting 48 V intermediate bus to 3.3 V for digital baseband processors in outdoor small-cell radios. IC Role / Device Role / Timing Role: High-input-voltage buck regulator with built-in overcurrent and thermal fault handling. Use Value: 60 V absolute maximum input rating and 3.2–6 A current limit support transient robustness in telecom power distribution. |
Use Scenario: Powering CAN transceivers and microcontrollers in vehicle body electronics with 12 V battery input. IC Role / Device Role / Timing Role: Compact, thermally robust buck converter for 3.3 V logic rail in space-constrained junction boxes. Use Value: TO263-5L package with soldered GND tab provides mechanical stability and thermal margin under vibration and thermal cycling. |
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 |
|---|---|---|---|
| MP2315DJ-LF-Z (Monolithic Power) | 400 kHz switching, 3 A, 3.3 V fixed, smaller SOIC-8 package, no thermal shutdown latch | Better transient response and smaller footprint, but lower thermal margin at 3 A continuous load | Select when board space is constrained and ambient temperature remains ≤60 °C |
| LM2678SX-3.3/NOPB (TI) | 63 V max input, 5 A switch, 3.3 V fixed, external compensation, 260 kHz | Higher current headroom and wider input range, but requires external RC compensation and larger solution size | Select when future scalability to >3 A or >60 V input is required |
Compared with MP2315DJ-LF-Z and LM2678SX-3.3/NOPB, AP1512A-33K5L-U offers superior thermal robustness at 3 A due to its TO263-5L package and integrated thermal shutdown, while maintaining minimal external component count and proven reliability in industrial environments.
Availability
AP1512A-33K5L-U is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded system core rails, telecom remote radio units, and automotive body control modules requiring stable component supply with long lifecycle visibility.
Supply support for AP1512A-33K5L-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 power management, signal integrity, and protection solutions for industrial, computing, and communications markets.
The AP1512/A series belongs to Diodes' high-voltage buck converter product line, engineered for cost-sensitive, thermally demanding applications where integration, reliability, and wide input range are critical.
FAQ
What is the maximum recommended output current for AP1512A-33K5L-U at 85°C ambient?
The AP1512A-33K5L-U supports 3 A continuous output current when mounted on ≥2 in² of 2 oz copper with adequate airflow. At 85°C ambient and no forced cooling, derating to 2.5 A is advised based on thermal resistance (θJA = 23 °C/W) and junction temperature limit of 125°C. Layout adherence to Diodes' AP02001 pad guidelines is mandatory for full rating.
Can AP1512A-33K5L-U be used with input voltages below 4.5 V?
No. The absolute minimum operating input voltage is 4.5 V per the Recommended Operating Conditions table. Below this threshold, internal bias circuitry fails to activate, resulting in no switching action and undefined output behavior. For sub-4.5 V inputs, a different regulator architecture (e.g., LDO or low-VIN buck) is required.
Is external feedback compensation required for stability?
No. The AP1512A-33K5L-U features fully internal compensation optimized for standard buck configurations using 33–47 µH inductors and 470–1500 µF output capacitors. No external compensation components are needed - the internal network ensures stable line/load regulation across the full operating range.
How does the SD pin behave when left floating?
When the SD pin is left unconnected (floating), the internal pull-down ensures the regulator remains enabled - identical to connecting SD to GND. This default-ON behavior eliminates risk of unintended shutdown during power-up or signal glitches, simplifying system design in non-critical control applications.
AP1512A-33K5L-U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Packaging:
- Tube
- 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):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 50kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-5
AP1512A-33K5L-U FAQ
1.How can I place an order for AP1512A-33K5L-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1512A-33K5L-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 AP1512A-33K5L-U reliable?
The price and inventory of AP1512A-33K5L-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1512A-33K5L-U is usually 5 days.
3.What payment methods are accepted for AP1512A-33K5L-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1512A-33K5L-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1512A-33K5L-U?
AP1512A-33K5L-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1512A-33K5L-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 AP1512A-33K5L-U?
For technical support, including AP1512A-33K5L-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1512A-33K5L-U requirements.
6.How does Aetrix verify that AP1512A-33K5L-U is sourced from the original manufacturer or authorized distributors?
All AP1512A-33K5L-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 AP1512A-33K5L-U meets industry standards.
7.What is the process for return or replacement of AP1512A-33K5L-U?
All AP1512A-33K5L-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1512A-33K5L-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 AP1512A-33K5L-U part is unused and in its original packaging.
Return procedure for AP1512A-33K5L-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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