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Diodes Incorporated AP1501-12T5G-U
- Part No.:
- AP1501-12T5G-U
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-220-5
- Datasheet:
-
AP1501-12T5G-U.pdf
- Description:
- IC REG BUCK 3A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,846
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Product details
Overview
AP1501-12T5G-U from Diodes Incorporated is a fixed-output 12V, 3A non-synchronous PWM buck DC/DC converter in TO220-5(R) package, operating at 150kHz ±15%, with integrated switch, thermal shutdown, current limit, and ON/OFF control. It supports input voltages up to 40V and delivers ±4% output voltage accuracy under full load and temperature range - used in industrial power rails requiring compact, cost-effective step-down regulation.
For engineers reviewing the AP1501-12T5G-U datasheet, AP1501-12T5G-U pinout, AP1501-12T5G-U application, or AP1501-12T5G-U equivalent, key selection considerations include its fixed 12V output, 3A continuous load capability, TO220-5(R) thermal performance (θJA = 31°C/W), shutdown quiescent current of 150–350µA, and compatibility with standard external catch diodes like B340A.
Technical Context
The AP1501-12T5G-U implements voltage-mode PWM control with an internal 150kHz oscillator and built-in 3A N-channel DMOS switch. Feedback is taken directly from the output via the FB pin, referenced to a precise 1.23V internal bandgap, enabling stable regulation without external compensation components.
It features logic-level ON/OFF control (VIL ≤ 0.6V for ON, VIH ≥ 2.0V for OFF), thermal shutdown triggered at TJ ≈ 150°C, and cycle-by-cycle current limiting set at 3.6–5.5A peak. The device operates across –20°C to +85°C ambient and supports input voltages from 15V to 40V for the 12V output version.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±4% over full load (0.2–3A) and temperature (–20°C to +85°C) |
| Switching Frequency | 150kHz ±15% - enables use of low-cost, small-footprint 33–47µH inductors |
| Max Output Current | 3A continuous - limited by internal switch RDS(on) and thermal design in TO220-5(R) |
| Input Voltage Range | 15V to 40V - supports wide industrial DC bus inputs including 24V and 36V systems |
| Efficiency | 90% at VIN = 15V, IOUT = 3A - reduces heat generation and improves system power density |
| Shutdown Quiescent Current | 150–350µA - enables ultra-low-power standby mode for battery-backed or energy-sensitive systems |
| Thermal Resistance | θJA = 31°C/W (TO220-5R, 3in² copper) - requires heatsink for sustained 3A operation above ~30°C ambient |
Pinout & Package
AP1501-12T5G-U is housed in a TO220-5(R) package with exposed metal tab electrically connected to GND. The tab serves as primary thermal path and must be mounted to a heatsink or large copper pour for reliable 3A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Positive input supply | Accepts 15–40V DC; requires local 100µF+ low-ESR input capacitor to handle switching transients |
| 2 - Output | Internal switch drain node | Swings between VIN–VSAT (~VIN–1.4V) and ~–0.5V; connects to inductor and catch diode anode |
| 3 - Gnd | Power and signal ground reference | Common return for VIN, FB, SD, and thermal tab; must be low-impedance connection to minimize noise |
| 4 - FB | Feedback input | Monitors output via resistor divider; internally compared to 1.23V reference - not used in fixed-12V version |
| 5 - SD | Shutdown control | Logic-compatible input: <0.6V = ON, >2.0V = OFF; pulls total supply current to ~250µA in shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3A DMOS switch | Eliminates need for external MOSFET driver and gate resistor - simplifies layout and reduces BOM count |
| Voltage-mode PWM control | Provides stable line/load regulation without external compensation network - reduces design iteration time |
| Thermal shutdown + current limit | Protects against sustained overload or poor heatsinking - prevents catastrophic failure during fault conditions |
| ON/OFF logic control | Enables system-level power sequencing and sleep/wake coordination using standard 3.3V/5V GPIO |
| Green, RoHS-compliant packaging | TO220-5(R) meets EU Directive 2011/65/EU and contains <900ppm Br/Cl, <1000ppm Sb - supports environmental compliance programs |
Applications
| Industrial 24V-to-12V Rail | POS Terminal Power Supply |
|---|---|
|
Use Scenario: Converting 24V DC bus to regulated 12V for motor drivers, sensors, and I/O modules in factory automation PLCs. IC Role / Device Role / Timing Role: Primary non-isolated step-down regulator delivering 3A continuous current with minimal external components. Use Value: Replaces discrete buck controllers + MOSFETs, reducing footprint by >40% and eliminating gate-drive design complexity. |
Use Scenario: Providing clean 12V power to receipt printers, barcode scanners, and display backlights in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter with shutdown control synchronized to system sleep mode. Use Value: Achieves 90% efficiency at full load, cutting thermal load in sealed enclosures and extending fanless operation. |
| Legacy Equipment Retrofit | Test & Measurement Instrumentation |
|
Use Scenario: Upgrading aging linear regulators (e.g., 7812) in legacy industrial equipment where board space and heat dissipation are constrained. IC Role / Device Role / Timing Role: Drop-in replacement for TO220-based linear regulators, reusing existing footprint and heatsink. Use Value: Delivers same 12V output with 3× higher efficiency - reduces heatsink size by 60% and eliminates thermal derating at 3A. |
Use Scenario: Generating stable 12V bias for analog front-ends, ADC references, and op-amp rails in portable benchtop instruments. IC Role / Device Role / Timing Role: Low-noise, well-regulated supply stage with tight ±4% output tolerance and low standby current. Use Value: Maintains measurement accuracy across temperature and load while enabling battery backup via SD pin control. |
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 |
|---|---|---|---|
| AP1501-12K5G-13 | Same IC die, but in TO263-5 surface-mount package; θJA = 37°C/W (vs. 31°C/W); tape-and-reel only | Requires PCB rework for SMT assembly; better suited for high-volume automated production than manual heatsink mounting | Select when migrating to surface-mount manufacturing or when board space constraints favor SMT over through-hole. |
| LM2596S-12 | 150kHz adjustable/fixed buck; 3A rating; requires external diode; no integrated SD pin; ±2% output tolerance | Lacks logic-controlled shutdown; slightly tighter output tolerance but higher external component count and layout sensitivity | Choose if absolute output precision is prioritized over integration and control flexibility - verify thermal performance with external diode. |
Compared with AP1501-12K5G-13, the AP1501-12T5G-U offers superior thermal resistance in through-hole form factor but requires mechanical heatsinking; versus LM2596S-12, it integrates shutdown control and simplifies layout at the cost of slightly looser output tolerance.
Availability
AP1501-12T5G-U is available at Aetrix Electronics and suitable for industrial power conversion, POS terminal design, and legacy equipment retrofit requiring stable component supply and long-term manufacturability support.
Supply support for AP1501-12T5G-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, computing, and consumer markets.
The AP1501 product line delivers fully integrated, cost-optimized buck converters targeting applications where simplicity, thermal robustness, and fixed-output stability outweigh programmability - especially in cost-sensitive industrial and embedded power supplies.
FAQ
Can AP1501-12T5G-U operate without an external catch diode?
No. The AP1501-12T5G-U is a non-synchronous buck converter and requires an external Schottky diode (e.g., B340A or PDS340 series) connected from the Output pin to GND. Omitting this diode will cause catastrophic failure due to inductive kickback and lack of freewheeling path during switch-off cycles.
What is the minimum input voltage required for stable 12V output?
The AP1501-12T5G-U requires a minimum input voltage of 15V to maintain regulation at full 3A load, per its recommended operating conditions. Below 15V, duty cycle approaches 100% and regulation degrades; dropout occurs near 13.5V depending on load and temperature.
Is the FB pin connected or unused in the AP1501-12T5G-U?
The FB pin is internally connected to the 12V feedback divider and is not accessible for adjustment. It must remain unconnected or tied to GND per datasheet guidance - floating the FB pin may cause instability or erratic regulation due to noise coupling.
Does AP1501-12T5G-U support synchronous rectification?
No. The AP1501-12T5G-U uses a single internal N-channel DMOS switch and requires an external catch diode. It does not support synchronous operation - no gate drive signals or timing interfaces are provided for an external low-side MOSFET.
AP1501-12T5G-U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- TO-220-5
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-5
AP1501-12T5G-U FAQ
1.How can I place an order for AP1501-12T5G-U through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1501-12T5G-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 AP1501-12T5G-U reliable?
The price and inventory of AP1501-12T5G-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1501-12T5G-U is usually 5 days.
3.What payment methods are accepted for AP1501-12T5G-U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1501-12T5G-U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1501-12T5G-U?
AP1501-12T5G-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1501-12T5G-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 AP1501-12T5G-U?
For technical support, including AP1501-12T5G-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1501-12T5G-U requirements.
6.How does Aetrix verify that AP1501-12T5G-U is sourced from the original manufacturer or authorized distributors?
All AP1501-12T5G-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 AP1501-12T5G-U meets industry standards.
7.What is the process for return or replacement of AP1501-12T5G-U?
All AP1501-12T5G-U units undergo pre-shipment inspection (PSI). If there is an issue with AP1501-12T5G-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 AP1501-12T5G-U part is unused and in its original packaging.
Return procedure for AP1501-12T5G-U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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