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AP1512A-50K5L-U Equivalent & Substitute Parts
Part Overview
The AP1512A-50K5L-U is a buck switching regulator IC manufactured by Diodes Incorporated, rated for 5V fixed output at 3A maximum current. This device operates across a wide input voltage range of 4.5V to 60V and is housed in a TO-263-6 (D2PAK) surface mount package. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across input voltage range, output voltage specification, output current capability, and package form factor.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | AP1512A-50K5L-U |
| Manufacturer | Diodes Incorporated |
| Function | Step-Down (Buck) |
| Output Voltage | 5V 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 is determined by the following critical parameters:
- Output Voltage: Must be fixed at 5V
- Package Type: Must be TO-263-6 (D2PAK, 5 Leads + Tab)
- Output Current Capability: Must support minimum 3A
- Input Voltage Range: Must accommodate 4.5V to 60V operation
- Topology: Buck or Buck-Boost configuration acceptable
- Compliance: ROHS3 compliance required
Substitute parts are grouped into two categories based on output current rating:
Category A - Full Current Rating (3A): Parts with 3A or greater output current capability, providing direct functional replacement without derating.
Category B - Reduced Current Rating (1A-1.7A): Parts with lower output current ratings, suitable only for applications where the 3A specification is not fully utilized or where design margin permits operation at reduced current levels.
Parameter Comparison
| Part Number | Manufacturer | Output Current | Input Voltage (Min) | Input Voltage (Max) | Switching Frequency | Operating Temperature | Product Status | Packaging |
|---|---|---|---|---|---|---|---|---|
| AP1512A-50K5L-U | Diodes Incorporated | 3A | 4.5V | 60V | 50kHz | -20°C to 85°C | Obsolete | Tube |
| LM2576-5.0WU | Microchip Technology | 3A | 4V | 40V | 52kHz | -40°C to 125°C | Active | Tube |
| LM2576-5.0WU-TR | Microchip Technology | 3A | 4V | 40V | 52kHz | -40°C to 125°C | Active | Tape & Reel |
| MIC4576-5.0WU | Microchip Technology | 3A | 4V | 36V | 200kHz | -40°C to 85°C | Active | Tube |
| MIC4576-5.0WU-TR | Microchip Technology | 3A | 4V | 36V | 200kHz | -40°C to 85°C | Active | Tape & Reel |
| LM2575HVSX-5.0/NOPB | Texas Instruments | 1A | 4V | 60V | 52kHz | -40°C to 125°C | Active | Cut Tape & Digi-Reel |
| LM2591HVS-5.0/NOPB | Texas Instruments | 1A | 4.5V | 60V | 150kHz | -40°C to 125°C | Active | Tube |
| LM2591HVSX-5.0/NOPB | Texas Instruments | 1A | 4.5V | 60V | 150kHz | -40°C to 125°C | Active | Cut Tape & Digi-Reel |
| MIC4575-5.0WU | Microchip Technology | 1.7A (Switch) | 4V | 24V | 200kHz | -40°C to 85°C | Active | Tube |
| MIC4575-5.0WU-TR | Microchip Technology | 1.7A (Switch) | 4V | 24V | 200kHz | -40°C to 85°C | Active | Tape & Reel |
| TL2575-05IKTTR | Texas Instruments | 1A | 4.75V | 40V | 52kHz | -40°C to 125°C | Active | Cut Tape & Digi-Reel |
Engineering Selection Recommendations
Primary Substitutes (Full 3A Current Rating)
LM2576-5.0WU and LM2576-5.0WU-TR from Microchip Technology are the preferred direct replacements. Both maintain 3A output current and are in active production status. The LM2576-5.0WU-TR variant in Tape & Reel packaging is recommended for high-volume production. Input voltage maximum is reduced to 40V compared to the original 60V specification; applications requiring the full 60V input range must use alternative parts.
MIC4576-5.0WU and MIC4576-5.0WU-TR from Microchip Technology provide 3A output current with higher switching frequency (200kHz) and are actively produced. Input voltage maximum is 36V, further restricting high-voltage applications. The Tape & Reel variant (MIC4576-5.0WU-TR) is suitable for automated assembly.
Secondary Substitutes (Reduced Current Rating)
LM2591HVS-5.0/NOPB and LM2591HVSX-5.0/NOPB from Texas Instruments maintain the full 4.5V to 60V input voltage range of the original part but are rated for 1A output current. These are suitable for applications where the 3A specification exceeds actual load requirements.
LM2575HVSX-5.0/NOPB from Texas Instruments supports 60V maximum input voltage with 1A output current and is available in Cut Tape & Digi-Reel packaging.
TL2575-05IKTTR from Texas Instruments provides 1A output current with input voltage range of 4.75V to 40V in Cut Tape & Digi-Reel packaging.
MIC4575-5.0WU and MIC4575-5.0WU-TR from Microchip Technology offer Buck-Boost topology with 1.7A switch current rating and 200kHz switching frequency. Input voltage maximum is limited to 24V, restricting use in high-voltage applications.
All substitute parts maintain ROHS3 compliance and are housed in the required TO-263-6 (D2PAK) package.
Frequently Asked Questions (FAQ)
Q: Can LM2576-5.0WU directly replace AP1512A-50K5L-U in all applications?
A: LM2576-5.0WU is functionally compatible for applications where input voltage does not exceed 40V. The original part specifies 60V maximum input; applications requiring operation above 40V require alternative selection such as LM2591HVS-5.0/NOPB or LM2591HVSX-5.0/NOPB.
Q: What is the difference between tube and Tape & Reel packaging options?
A: Tube packaging is suitable for manual assembly and lower-volume production. Tape & Reel packaging is designed for automated pick-and-place assembly equipment and is standard for high-volume manufacturing. Both packaging variants contain identical die and electrical specifications.
Q: Are the 1A-rated parts suitable replacements for the 3A specification?
A: 1A-rated parts are suitable only when actual load current does not exceed 1A. If the application requires 3A output current, these parts will not provide adequate current capacity. Verify actual load requirements before selecting reduced-current alternatives.
Q: Why do some substitutes have different maximum input voltages?
A: Input voltage ratings are determined by the internal design of each regulator IC. The LM2576 series is rated to 40V maximum, while the LM2591 series supports 60V. Application circuits operating above 40V input must use parts with corresponding higher voltage ratings.
Q: Is the switching frequency difference between 50kHz and 200kHz significant?
A: Switching frequency affects output filter component sizing and EMI characteristics. Higher switching frequencies (200kHz) allow smaller filter inductors and capacitors but may increase switching losses. Lower frequencies (50kHz) reduce switching losses but require larger filter components. Circuit redesign may be necessary when substituting parts with significantly different switching frequencies.
Q: Are all substitute parts ROHS3 compliant?
A: Yes, all listed substitute parts are ROHS3 compliant and meet the same environmental compliance requirements as the original AP1512A-50K5L-U.
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