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AP1512A-33K5L-U Equivalent & Substitute Parts
Part Overview
The AP1512A-33K5L-U is a buck switching regulator IC manufactured by Diodes Incorporated, rated for 3.3V fixed output at 3A maximum current. This device operates across a 4.5V to 60V input range with a 50kHz switching frequency in a TO-263-6 (D2PAK) surface mount package. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | AP1512A-33K5L-U |
| Manufacturer | Diodes Incorporated |
| Function | Step-Down (Buck) |
| Output Voltage | 3.3V Fixed |
| Output Current | 3A |
| Input Voltage Range | 4.5V to 60V |
| Switching Frequency | 50kHz |
| Package | TO-263-6 (D2PAK, 5 Leads + Tab) |
| Operating Temperature | -20°C to 85°C |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the AP1512A-33K5L-U is determined by the following critical parameters:
- Output Voltage: Must be fixed at 3.3V
- Package Type: Must be TO-263-6 (D2PAK, 5 Leads + Tab)
- Topology: Must be buck (step-down) configuration
- Output Current Rating: Must support minimum 3A continuous output
- Input Voltage Range: Must accommodate 4.5V to 60V minimum
- Mounting Type: Must be surface mount
Substitute parts are grouped into two categories based on output current capability:
Category A - Full Current Rating (3A Output): Parts rated for 3A output current, providing direct functional replacement with identical current handling.
Category B - Reduced Current Rating (1A Output): Parts rated for 1A output current, suitable only for applications requiring less than 3A output current.
Parameter Comparison
| Part Number | Manufacturer | Output Voltage | Output Current | Input Voltage (Min-Max) | Switching Frequency | Operating Temperature | Package | Product Status |
|---|---|---|---|---|---|---|---|---|
| AP1512A-33K5L-U | Diodes Incorporated | 3.3V | 3A | 4.5V - 60V | 50kHz | -20°C to 85°C | TO-263-6 | Obsolete |
| LM2576-3.3WU | Microchip Technology | 3.3V | 3A | 4V - 40V | 52kHz | -40°C to 125°C | TO-263-6 | Active |
| LM2576-3.3WU-TR | Microchip Technology | 3.3V | 3A | 4V - 40V | 52kHz | -40°C to 125°C | TO-263-6 | Active |
| MIC4576-3.3WU | Microchip Technology | 3.3V | 3A | 4V - 36V | 200kHz | -40°C to 85°C | TO-263-6 | Active |
| MIC4576-3.3WU-TR | Microchip Technology | 3.3V | 3A | 4V - 36V | 200kHz | -40°C to 85°C | TO-263-6 | Active |
| LM2575HVSX-3.3/NOPB | Texas Instruments | 3.3V | 1A | 4V - 60V | 52kHz | -40°C to 125°C | TO-263-6 | Active |
| LM2591HVS-3.3/NOPB | Texas Instruments | 3.3V | 1A | 4.5V - 60V | 150kHz | -40°C to 125°C | TO-263-6 | Active |
| LM2591HVSX-3.3/NOPB | Texas Instruments | 3.3V | 1A | 4.5V - 60V | 150kHz | -40°C to 125°C | TO-263-6 | Active |
| MIC4575-3.3WU | Microchip Technology | 3.3V | 1.7A | 4V - 24V | 200kHz | -40°C to 85°C | TO-263-6 | Active |
| MIC4575-3.3WU-TR | Microchip Technology | 3.3V | 1.7A | 4V - 24V | 200kHz | -40°C to 85°C | TO-263-6 | Active |
| TL2575-33IKTTR | Texas Instruments | 3.3V | 1A | 4.75V - 40V | 52kHz | -40°C to 125°C | TO-263-6 | Active |
Engineering Selection Recommendations
Primary Substitutes (Full 3A Current Rating)
LM2576-3.3WU and LM2576-3.3WU-TR are the preferred direct replacements. Both are active products from Microchip Technology with identical 3A output current rating and TO-263-6 packaging. The LM2576-3.3WU-TR variant in Tape & Reel packaging is recommended for production volumes. Input voltage range is 4V to 40V, which covers the original 4.5V minimum requirement. Operating temperature extends to -40°C to 125°C, providing wider environmental tolerance than the original part.
MIC4576-3.3WU and MIC4576-3.3WU-TR maintain the 3A output current rating and TO-263-6 package. These parts operate at 200kHz switching frequency compared to the original 50kHz, resulting in smaller external component requirements. Input voltage range is 4V to 36V. The MIC4576-3.3WU-TR variant in Cut Tape & Digi-Reel packaging is suitable for production applications.
Secondary Substitutes (Reduced Current Rating)
LM2591HVS-3.3/NOPB and LM2591HVSX-3.3/NOPB are suitable for applications requiring less than 3A output current. These Texas Instruments parts maintain the 4.5V to 60V input voltage range matching the original specification. Operating temperature range is -40°C to 125°C. The 150kHz switching frequency enables compact external component design.
LM2575HVSX-3.3/NOPB supports the full 4V to 60V input range with 1A output current rating. This part is appropriate for lower-current applications.
MIC4575-3.3WU and MIC4575-3.3WU-TR provide 1.7A output current with 200kHz switching frequency. Input voltage range is limited to 4V to 24V, restricting use to lower input voltage applications.
All substitute parts are ROHS3 compliant and maintain surface mount TO-263-6 packaging compatibility.
Frequently Asked Questions (FAQ)
Q: Can I use a 1A-rated part as a direct replacement for the 3A AP1512A-33K5L-U?
A: No. The 1A-rated parts (LM2575HVSX-3.3/NOPB, LM2591HVS-3.3/NOPB, LM2591HVSX-3.3/NOPB, TL2575-33IKTTR) are suitable only for applications drawing less than 1A continuous output current. Using a 1A part in a 3A application will cause thermal stress and potential device failure.
Q: What is the difference between LM2576-3.3WU and LM2576-3.3WU-TR?
A: Both parts are electrically identical with 3A output current rating. The primary difference is packaging: LM2576-3.3WU is supplied in Tube packaging for smaller quantities, while LM2576-3.3WU-TR is supplied in Tape & Reel (TR) format for automated assembly and production volumes.
Q: Why do some substitutes have lower maximum input voltage than the original AP1512A-33K5L-U?
A: The original part specifies 4.5V to 60V input range. LM2576 variants limit maximum input to 40V, and MIC4576 variants to 36V. These parts are suitable only for applications where the actual input voltage remains within their specified range. For applications requiring the full 60V input capability, use LM2591HVS-3.3/NOPB or LM2591HVSX-3.3/NOPB.
Q: Are all substitute parts RoHS compliant?
A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of the original AP1512A-33K5L-U.
Q: What is the significance of the higher switching frequency in MIC4575 and MIC4576 parts?
A: MIC4575 and MIC4576 parts operate at 200kHz compared to the original 50kHz. Higher switching frequency allows use of smaller external inductors and capacitors, reducing board space and component cost. However, higher frequency may increase electromagnetic interference (EMI) in sensitive applications.
Q: Can I interchange MIC4575-3.3WU and MIC4575-3.3WU-TR?
A: Yes, electrically. Both parts are identical except for packaging format. MIC4575-3.3WU uses Tube packaging, while MIC4575-3.3WU-TR uses Cut Tape & Digi-Reel packaging for automated production assembly.
Q: Which substitute is best for high-temperature applications?
A: LM2576-3.3WU-TR, LM2575HVSX-3.3/NOPB, LM2591HVS-3.3/NOPB, LM2591HVSX-3.3/NOPB, and TL2575-33IKTTR all support -40°C to 125°C operating temperature, compared to the original -20°C to 85°C range.
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