AP1501A-50T5L-U Equivalent & Substitute Parts

Part Overview

The AP1501A-50T5L-U is a buck switching regulator IC manufactured by Diodes Incorporated, designed to deliver fixed 5V output at 5A from input sources ranging 4.5V to 40V. This through-hole TO-220-5 package component operates at 150kHz switching frequency with no synchronous rectifier. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring similar functionality.

Substiute Parts

AP1501A-50T5L-U

Diodes IncorporatedIn Stock: 1008AP1501A-50T5L-U Datasheet

Current PartRFQ

LM2575T-5.0/LF03

Texas InstrumentsIn Stock: 2512LM2575T-5.0/LF03 Datasheet

MFR RecommendedRFQ

LM2575T-5.0/NOPB

Texas InstrumentsIn Stock: 10224LM2575T-5.0/NOPB Datasheet

MFR RecommendedRFQ

LM2576-5.0WT

Microchip TechnologyIn Stock: 2853LM2576-5.0WT Datasheet

MFR RecommendedRFQ

LM2591HVT-5.0/NOPB

Texas InstrumentsIn Stock: 2138LM2591HVT-5.0/NOPB Datasheet

MFR RecommendedRFQ

MIC4575-5.0WT

Microchip TechnologyIn Stock: 8003MIC4575-5.0WT Datasheet

MFR RecommendedRFQ

MIC4576-5.0WT

Microchip TechnologyIn Stock: 9076MIC4576-5.0WT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AP1501A-50T5L-U is determined by the following critical parameters: fixed 5V output voltage, TO-220-5 package compatibility, through-hole mounting, buck topology, and positive output configuration. The primary constraint is output current capacity. The original part delivers 5A; therefore, direct substitutes must maintain or exceed this current rating while preserving input voltage range compatibility (4.5V minimum to 40V maximum).

The substitute parts are grouped into two categories:

Category 1: Full Current Capacity Substitutes (3A to 5A Output) These parts meet or approach the original 5A output specification and are suitable for direct replacement in applications requiring maximum current delivery.

Category 2: Reduced Current Capacity Substitutes (1A to 1.7A Output) These parts provide lower output current ratings and are suitable only for applications where load current does not exceed the substitute part's rating.

All substitute parts maintain the same output voltage (5V fixed), package type (TO-220-5), mounting method (through hole), and topology (buck). Input voltage ranges and switching frequencies vary among substitutes but remain within acceptable operating parameters for buck regulator applications.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring full 5A output current capacity: LM2576-5.0WT and MIC4576-5.0WT are the primary candidates, each delivering 3A output current. Neither achieves the original 5A specification; however, both are active products with ROHS3 compliance and extended operating temperature ranges (-40°C to 85°C). MIC4576-5.0WT offers higher input voltage maximum (36V vs. 40V) and higher switching frequency (200kHz vs. 52kHz). LM2576-5.0WT provides lower switching frequency, which may reduce EMI in noise-sensitive applications.

For applications tolerating reduced output current (1A to 1.7A): LM2575T-5.0/NOPB, LM2575T-5.0/LF03, LM2591HVT-5.0/NOPB, and MIC4575-5.0WT are suitable. All are active products with ROHS3 compliance. LM2591HVT-5.0/NOPB matches the original 150kHz switching frequency and supports input voltage to 60V, providing the widest input range among all substitutes. LM2575 variants operate at 52kHz and support 40V maximum input. MIC4575-5.0WT operates at 200kHz with 24V maximum input voltage, limiting its use to lower input voltage applications.

All substitute parts maintain positive output configuration, buck topology, and TO-220-5 through-hole packaging, ensuring mechanical and electrical compatibility with the original AP1501A-50T5L-U footprint and pinout.

Frequently Asked Questions (FAQ)

Q: Can LM2576-5.0WT or MIC4576-5.0WT directly replace the AP1501A-50T5L-U in all applications? A: These parts are mechanically and electrically compatible in TO-220-5 through-hole applications. However, output current capacity is reduced from 5A to 3A. Direct replacement is valid only for applications where load current does not exceed 3A. Thermal design and PCB layout may require adjustment due to higher power dissipation at reduced current capacity.

Q: What is the significance of switching frequency differences between the original and substitute parts? A: The AP1501A-50T5L-U operates at 150kHz. Substitutes range from 52kHz to 200kHz. Lower switching frequencies (52kHz) reduce switching losses and EMI but require larger output filter components. Higher frequencies (200kHz) allow smaller filter components but increase switching losses. Selection depends on application requirements for component size, EMI performance, and efficiency.

Q: Are all substitute parts suitable for the full 4.5V to 40V input range of the original part? A: No. MIC4575-5.0WT limits input voltage to 24V maximum, making it unsuitable for applications requiring the full 40V input range. LM2591HVT-5.0/NOPB extends to 60V, exceeding the original specification. LM2575 variants, LM2576-5.0WT, and MIC4576-5.0WT support the full 40V maximum input voltage.

Q: Do all substitute parts maintain ROHS3 compliance? A: Yes. All listed substitute parts are ROHS3 compliant, matching the original AP1501A-50T5L-U compliance status.

Q: What is the difference between LM2575T-5.0/LF03 and LM2575T-5.0/NOPB? A: Both are identical LM2575 buck regulators with 1A output current and 52kHz switching frequency. The primary difference is packaging: LM2575T-5.0/LF03 is supplied in tube packaging with formed leads, while LM2575T-5.0/NOPB is supplied in tube packaging with standard leads. Electrical performance and pinout are identical.

Q: Can MIC4575-5.0WT be used as a substitute despite its buck-boost topology? A: MIC4575-5.0WT supports both buck and buck-boost operation modes. In buck-only mode, it functions identically to a standard buck regulator and is compatible with the AP1501A-50T5L-U. However, its 24V maximum input voltage limits use to applications below this threshold.