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Diodes Incorporated AP1512A-33K5G-13
- Part No.:
- AP1512A-33K5G-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
AP1512A-33K5G-13.pdf
- Description:
- IC REG BUCK 2A TO263-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,585
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Product details
Overview
AP1512A-33K5G-13 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-controlled shutdown. It operates from 4.5 V to 60 V input, delivers ±4% output voltage accuracy at 3.3 V under load, and targets high-efficiency on-card step-down regulation in industrial power supplies.
For engineers reviewing the AP1512A-33K5G-13 datasheet, AP1512A-33K5G-13 pinout, AP1512A-33K5G-13 application, or AP1512A-33K5G-13 equivalent, key selection criteria include its 3 A continuous output capability, thermal shutdown + current limit protection, 50 kHz fixed-frequency operation enabling compact LC filtering, and compatibility with standard TO263 heatsinking layouts.
Technical Context
The AP1512A-33K5G-13 implements voltage-mode PWM control with internal 1.235 V reference and error amplifier compensation, eliminating external compensation components. Its oscillator is trimmed to 50 kHz ±15%, and duty cycle is regulated via feedback voltage comparison against the internal reference.
It integrates a high-side N-channel MOSFET switch rated for 3 A peak current (typ. 4 A), thermal shutdown triggered above 125 °C junction temperature, and current-limit protection active during startup and overload. Shutdown is asserted when SD pin voltage exceeds 2.0 V, reducing quiescent current to 350 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±4% over full load (0.2–3 A) and temperature (−40 to +125 °C) |
| Switching Frequency | 50 kHz ±15% - enables use of smaller inductors (e.g., 33–47 µH) and electrolytic output capacitors |
| Max Output Current | 3 A continuous - supports higher-power embedded rails without external pass devices |
| Input Voltage Range | 4.5 V to 60 V - suitable for wide-input industrial, automotive battery-supplied, and telecom systems |
| Thermal Protection | Internal thermal shutdown at TJ > 125 °C - prevents latch-up or permanent damage during sustained overload |
| Shutdown Quiescent Current | 350 µA at VIN = 60 V - enables low-power standby mode in battery-backed or energy-sensitive systems |
| Feedback Reference | 1.235 V internal reference - sets output accuracy and stability without external resistor divider for fixed versions |
Pinout & Package
AP1512A-33K5G-13 is housed in a surface-mount TO263-5L package with exposed metal tab (GND-connected) for thermal conduction to PCB copper. The package requires ≥0.4 in² minimum copper area for safe 3 A operation; recommended layout uses ≥2 in² of 2 oz copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Positive input supply | Accepts 4.5–60 V; requires local 1 µF ceramic bypass to suppress switching transients |
| OUTPUT (Pin 2) | Switch node | Drives external catch diode and inductor; high dv/dt node - minimize trace area to reduce EMI |
| GND (Pin 3) | Power and signal ground | Common return for IC core, switch source, and feedback network; connects to exposed tab |
| FB (Pin 4) | Feedback input | Monitors output via internal 1.235 V reference; unused in fixed 3.3 V version (internally tied) |
| SD (Pin 5) | Shutdown control | Logic-level input: <1.3 V = ON, >2.0 V = OFF; pulls to GND or floats for always-on operation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3 A power switch | Eliminates external MOSFET and gate driver - reduces BOM count and layout complexity |
| Internal compensation | Enables stable regulation with no external compensation components - simplifies design validation |
| Thermal + current-limit protection | Prevents failure during short-circuit, overtemperature, or startup surge - improves system reliability |
| Logic-compatible shutdown | Supports microcontroller-controlled power sequencing and low-power sleep states |
| Lead-free / RoHS-compliant | Meets EU Directive 2002/95/EC - suitable for commercial and industrial environmental compliance |
Applications
| Industrial PLC Power Rail | Automotive Body Control Module |
|---|---|
|
Use Scenario: Provides stable 3.3 V rail for microcontrollers and CAN transceivers in programmable logic controllers operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3 V at up to 3 A with input transient tolerance up to 60 V. Use Value: Withstands 40 V load-dump pulses and maintains regulation during brownout - avoids MCU reset or communication loss. |
Use Scenario: Powers 3.3 V sensors and interface ICs in body control modules supplied from 12 V battery with cold-crank down to 6 V. IC Role / Device Role / Timing Role: Step-down converter with wide VIN range and shutdown control synchronized to vehicle ignition state. Use Value: Maintains 3.3 V output during cranking (down to 6 V input) and enters ultra-low-IQ standby (<500 µA) when ignition is off. |
| Telecom Remote Radio Unit | Factory Automation I/O Module |
|
Use Scenario: Generates 3.3 V for FPGA configuration and RF front-end bias in remote radio heads powered by −48 V DC supply (via intermediate +12 V). IC Role / Device Role / Timing Role: Secondary-stage buck regulator accepting 12 V input, delivering precise 3.3 V with tight line/load regulation. Use Value: Achieves 80% efficiency at 3 A load and 30 V input - minimizes heat buildup in sealed outdoor enclosures. |
Use Scenario: Supplies 3.3 V to isolated digital I/O ASICs and level translators in DIN-rail mounted automation controllers. IC Role / Device Role / Timing Role: High-reliability DC/DC converter with built-in current limiting and thermal shutdown for unattended operation. Use Value: Survives repeated short-circuit events on field wiring without latch-up or component degradation - reduces field service calls. |
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 | 40 V max input, 3 A, 1.5 MHz switching frequency, adjustable only | Requires external feedback resistors; higher frequency enables smaller magnetics but increases EMI filtering burden | Preferred where board space is constrained and input voltage ≤40 V; not drop-in for 60 V systems |
| LM2678SX-3.3/NOPB | 40 V max input, 5 A, 260 kHz, fixed 3.3 V, TO263-5 | Higher current rating but wider output tolerance (±5%), no integrated thermal shutdown flag | Chosen when >3 A margin is required and thermal monitoring is handled externally |
Compared with MP1584EN-LF-Z and LM2678SX-3.3/NOPB, the AP1512A-33K5G-13 uniquely combines 60 V input capability, fixed 3.3 V output with ±4% accuracy, and integrated thermal/current protection in a single TO263-5L package - making it optimal for ruggedized 24/48 V industrial systems where reliability trumps ultra-high frequency.
Availability
AP1512A-33K5G-13 is available at Aetrix Electronics and suitable for industrial PLC power rails, automotive body control modules, and telecom remote radio units requiring stable component supply across extended temperature and input voltage ranges.
Supply support for AP1512A-33K5G-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, computing, and consumer markets.
The AP1512/A series belongs to Diodes' high-voltage buck regulator product line, designed specifically for cost-sensitive, high-reliability DC/DC conversion in 24 V and 48 V industrial and transportation systems.
FAQ
What is the maximum allowable input voltage for AP1512A-33K5G-13?
The absolute maximum input voltage is +63 V, but the recommended operating range is +4.5 V to +60 V. Operation above 60 V risks exceeding internal transistor breakdown limits and may trigger premature thermal shutdown. Designers should maintain at least 3 V margin below 63 V for transient spikes.
Does AP1512A-33K5G-13 require external compensation components?
No - the AP1512A-33K5G-13 features fully internal frequency compensation. Its error amplifier and PWM comparator are factory-trimmed to ensure stable loop response across all operating conditions without external RC networks or capacitor connections to the FB pin.
How is thermal performance affected by PCB copper area?
Thermal resistance θJA drops from 23 °C/W (with ~3 in² copper) to ~15 °C/W with ≥6 in² of 2 oz copper. Below 0.4 in², junction temperature rise exceeds safe limits at 3 A load. The exposed tab must be soldered directly to GND plane; thermal vias under the tab improve conduction to inner layers.
Can AP1512A-33K5G-13 be used in adjustable-output configurations?
No - the "33" suffix denotes factory-trimmed 3.3 V fixed output. Internally, the FB pin is connected to the 1.235 V reference and output divider; external resistor networks cannot modify the output. For adjustable versions, select AP1512A-ADJK5G-13 instead.
AP1512A-33K5G-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:
- -
- 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:
- Surface Mount
- Supplier Device Package:
- TO-263-5
AP1512A-33K5G-13 FAQ
1.How can I place an order for AP1512A-33K5G-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1512A-33K5G-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 AP1512A-33K5G-13 reliable?
The price and inventory of AP1512A-33K5G-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1512A-33K5G-13 is usually 5 days.
3.What payment methods are accepted for AP1512A-33K5G-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1512A-33K5G-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1512A-33K5G-13?
AP1512A-33K5G-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1512A-33K5G-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 AP1512A-33K5G-13?
For technical support, including AP1512A-33K5G-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1512A-33K5G-13 requirements.
6.How does Aetrix verify that AP1512A-33K5G-13 is sourced from the original manufacturer or authorized distributors?
All AP1512A-33K5G-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 AP1512A-33K5G-13 meets industry standards.
7.What is the process for return or replacement of AP1512A-33K5G-13?
All AP1512A-33K5G-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1512A-33K5G-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 AP1512A-33K5G-13 part is unused and in its original packaging.
Return procedure for AP1512A-33K5G-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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