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AP1512-33K5L-U Equivalent & Substitute Parts
Part Overview
The AP1512-33K5L-U is a buck switching regulator IC manufactured by Diodes Incorporated, rated for 3.3V fixed output at 2A 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 new designs and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | AP1512-33K5L-U |
| Manufacturer | Diodes Incorporated |
| Function | Step-Down (Buck) |
| Output Voltage | 3.3V Fixed |
| Output Current | 2A |
| 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 is determined by the following critical parameters:
- Package Compatibility: All substitutes must use TO-263-6 (D2PAK) surface mount package to ensure PCB footprint compatibility
- Output Voltage: Fixed 3.3V output is mandatory for direct replacement
- Input Voltage Range: Minimum 4.5V input support required; maximum range of 40V or higher acceptable
- Output Current Rating: Minimum 1A required; 2A or higher preferred for equivalent performance
- Topology: Buck or Buck-Boost topologies acceptable; positive fixed output configuration required
- Compliance: ROHS3 compliance required; active product status preferred for long-term availability
Substitutes are grouped into two categories: direct equivalents (2A+ output current) and functional alternatives (1A output current with higher input voltage capability).
Parameter Comparison
| Part Number | Manufacturer | Output Current | Input Voltage (Min-Max) | Switching Frequency | Operating Temperature | Product Status | Packaging |
|---|---|---|---|---|---|---|---|
| AP1512-33K5L-U | Diodes Incorporated | 2A | 4.5V - 60V | 50kHz | -20°C to 85°C | Obsolete | Tube |
| LM2576-3.3WU | Microchip Technology | 3A | 4V - 40V | 52kHz | -40°C to 125°C | Active | Tube |
| LM2576-3.3WU-TR | Microchip Technology | 3A | 4V - 40V | 52kHz | -40°C to 125°C | Active | Tape & Reel |
| MIC4576-3.3WU | Microchip Technology | 3A | 4V - 36V | 200kHz | -40°C to 85°C | Active | Tube |
| MIC4576-3.3WU-TR | Microchip Technology | 3A | 4V - 36V | 200kHz | -40°C to 85°C | Active | Cut Tape & Digi-Reel |
| LM2575HVSX-3.3/NOPB | Texas Instruments | 1A | 4.5V - 60V | 52kHz | -40°C to 125°C | Active | Cut Tape & Digi-Reel |
| LM2591HVS-3.3/NOPB | Texas Instruments | 1A | 4.5V - 60V | 150kHz | -40°C to 125°C | Active | Tube |
| LM2591HVSX-3.3/NOPB | Texas Instruments | 1A | 4.5V - 60V | 150kHz | -40°C to 125°C | Active | Cut Tape & Digi-Reel |
| MIC4575-3.3WU | Microchip Technology | 1.7A (Switch) | 4V - 24V | 200kHz | -40°C to 85°C | Active | Tube |
| MIC4575-3.3WU-TR | Microchip Technology | 1.7A (Switch) | 4V - 24V | 200kHz | -40°C to 85°C | Active | Tape & Reel |
| TL2575-33IKTTR | Texas Instruments | 1A | 4.75V - 40V | 52kHz | -40°C to 125°C | Active | Tape & Reel |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility)
LM2576-3.3WU and LM2576-3.3WU-TR are the preferred direct replacements. Both deliver 3A output current, exceeding the original 2A specification, and maintain active product status with extended operating temperature range (-40°C to 125°C). The input voltage range of 4V to 40V covers the critical 4.5V minimum requirement of the original part. These devices are ROHS3 compliant and available in both tube and tape & reel packaging options.
Secondary Substitutes (Extended Input Voltage Range)
LM2575HVSX-3.3/NOPB, LM2591HVS-3.3/NOPB, and LM2591HVSX-3.3/NOPB maintain the full 4.5V to 60V input voltage range of the original AP1512-33K5L-U. These Texas Instruments parts are active and ROHS3 compliant. Output current is rated at 1A, which is below the original 2A specification but acceptable for applications with reduced current requirements. The LM2591 series operates at 150kHz switching frequency, offering improved efficiency in certain load conditions.
Alternative Substitutes (Higher Current Capability)
MIC4576-3.3WU and MIC4576-3.3WU-TR deliver 3A output current with active product status and ROHS3 compliance. Input voltage range is 4V to 36V. These parts operate at 200kHz switching frequency, enabling smaller external component sizing. Operating temperature range is -40°C to 85°C, matching the original part's upper limit.
Functional Alternative (Buck-Boost Topology)
MIC4575-3.3WU and MIC4575-3.3WU-TR support both buck and buck-boost operation with 1.7A switch current rating. Input voltage range is limited to 4V to 24V, restricting use in high-voltage input applications. These parts are active and ROHS3 compliant, suitable for designs requiring voltage regulation below the input level.
Frequently Asked Questions (FAQ)
Q: Can I use a 1A-rated substitute in place of the 2A AP1512-33K5L-U?
A: Yes, if your application's actual current draw does not exceed 1A. The LM2575HVSX-3.3/NOPB, LM2591HVS-3.3/NOPB, and LM2591HVSX-3.3/NOPB are direct pin-compatible alternatives with identical package geometry. Verify your circuit's maximum load current before selection.
Q: What is the difference between tube and tape & reel packaging?
A: Tube packaging is suitable for manual assembly and small-volume production. Tape & reel packaging is optimized for automated pick-and-place assembly in high-volume manufacturing. Both contain identical die and electrical specifications; packaging choice depends on assembly process requirements.
Q: Are all substitutes ROHS3 compliant?
A: Yes. All listed substitute parts meet ROHS3 compliance requirements, matching the original AP1512-33K5L-U specification.
Q: Which substitute offers the widest input voltage range?
A: The LM2575HVSX-3.3/NOPB, LM2591HVS-3.3/NOPB, and LM2591HVSX-3.3/NOPB maintain the full 4.5V to 60V input range of the original part. All other substitutes have reduced maximum input voltage ratings (24V to 40V).
Q: Can I directly swap the MIC4575 series for the AP1512-33K5L-U?
A: The MIC4575-3.3WU and MIC4575-3.3WU-TR are pin-compatible in the TO-263-6 package but have a reduced input voltage maximum of 24V. Use only if your application input voltage does not exceed 24V. These parts support buck-boost topology, offering additional flexibility for certain circuit configurations.
Q: What is the impact of switching frequency differences?
A: The original AP1512-33K5L-U operates at 50kHz. Substitutes range from 52kHz to 200kHz. Higher switching frequencies reduce external inductor and capacitor sizes but may increase EMI. Lower frequencies reduce EMI but require larger passive components. Verify PCB layout and component availability for your selected substitute.
Q: Which substitute has the longest operating temperature range?
A: The LM2575-3.3WU, LM2576-3.3WU-TR, LM2575HVSX-3.3/NOPB, LM2591HVS-3.3/NOPB, and LM2591HVSX-3.3/NOPB all operate from -40°C to 125°C, exceeding the original part's -20°C to 85°C range.
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