AP1501-50K5L-13 Equivalent & Substitute Parts

Part Overview

The AP1501-50K5L-13 is a buck switching regulator IC manufactured by Diodes Incorporated, rated for 5V fixed output at 3A in a TO-263-6 (D2PAK) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The device operates across a 4.5V to 40V input range with 150kHz switching frequency and is ROHS3 compliant with MSL-3 moisture sensitivity rating.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Part Number	AP1501-50K5L-13
Product Status	Obsolete
Function	Step-Down (Buck)
Output Voltage	5V Fixed
Output Current	3A
Input Voltage Range	4.5V to 40V
Switching Frequency	150kHz
Package	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature	-20°C to 85°C (TA)
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Output voltage: 5V fixed
Package type: TO-263-6, D2PAK (5 Leads + Tab)
Surface mount configuration
RoHS3 compliance
MSL-3 moisture sensitivity rating

Substitute parts are grouped into two categories based on output current capability:

Category 1: Direct Current Match (3A Output) Parts with 3A output current rating provide direct functional equivalence to the AP1501-50K5L-13 without derating considerations.

Category 2: Reduced Current Rating (1A to 1.7A Output) Parts with lower output current ratings (1A or 1.7A) are functionally compatible but operate at reduced maximum load capacity. These substitutes are suitable for applications where the full 3A capability is not required.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage Range	Switching Frequency	Operating Temperature	Product Status	Package
AP1501-50K5L-13	Diodes Incorporated	3A	4.5V to 40V	150kHz	-20°C to 85°C	Obsolete	TO-263-6, D2PAK
AP1501-50K5G-13	Diodes Incorporated	3A	4.5V to 40V	150kHz	-20°C to 85°C	Active	TO-263-6, D2PAK
MIC4576-5.0WU	Microchip Technology	3A	4V to 36V	200kHz	-40°C to 85°C	Active	TO-263-6, D2PAK
LM2575-5.0WU	Microchip Technology	1A	4V to 40V	52kHz	-40°C to 125°C	Active	TO-263-6, D2PAK
LM2575-5.0WU-TR	Microchip Technology	1A	4V to 40V	52kHz	-40°C to 125°C	Active	TO-263-6, D2PAK
LM2575S-5.0/NOPB	Texas Instruments	1A	4V to 40V	52kHz	-40°C to 125°C	Active	TO-263-6, D2PAK
LM2575SX-5.0/NOPB	Texas Instruments	1A	4V to 40V	52kHz	-40°C to 125°C	Active	TO-263-6, D2PAK
LM2591HVS-5.0/NOPB	Texas Instruments	1A	4.5V to 60V	150kHz	-40°C to 125°C	Active	TO-263-6, D2PAK
LM2591HVSX-5.0/NOPB	Texas Instruments	1A	4.5V to 60V	150kHz	-40°C to 125°C	Active	TO-263-6, D2PAK
MIC4575-5.0WU-TR	Microchip Technology	1.7A	4V to 24V	200kHz	-40°C to 85°C	Active	TO-263-6, D2PAK
NCV2575D2T-5R4G	onsemi	1A	4.75V to 40V	52kHz	-40°C to 125°C	Obsolete	TO-263-6, D2PAK

Engineering Selection Recommendations

Primary Substitute (Direct Replacement): AP1501-50K5G-13 is the recommended primary substitute. Manufactured by the same supplier (Diodes Incorporated), it maintains identical electrical specifications and package configuration while offering active product status and improved availability (23,999 units in stock versus 7,808 for the original part).

Secondary Substitutes (3A Current Rating): MIC4576-5.0WU provides equivalent 3A output current capability with active product status. Input voltage range is slightly reduced (4V to 36V versus 4.5V to 40V), and switching frequency is higher at 200kHz. This part is suitable for applications within the 4V to 36V input window.

Alternative Substitutes (Reduced Current Rating): LM2575 and LM2591 series devices from Texas Instruments and Microchip Technology provide active product status with 1A output current. These parts are suitable for applications requiring less than 3A output current. LM2591 variants offer extended input voltage range (4.5V to 60V) and higher switching frequency (150kHz) matching the original part's frequency characteristic. All alternatives maintain TO-263-6 package compatibility and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I use a 1A rated part as a direct replacement for the 3A AP1501-50K5L-13? A: No, not for applications requiring full 3A output. The 1A parts (LM2575, LM2591, NCV2575) are current-limited and will not support loads exceeding 1A. Use these only if your application requires 1A or less.

Q: What is the difference between LM2575-5.0WU and LM2575-5.0WU-TR? A: Both parts are electrically identical. The difference is packaging: LM2575-5.0WU is supplied in Tube packaging, while LM2575-5.0WU-TR is supplied in Tape & Reel format. Select based on your procurement and assembly requirements.

Q: Is MIC4575-5.0WU-TR compatible with my design? A: MIC4575-5.0WU-TR is compatible if your input voltage range is 4V to 24V. This part has a lower maximum input voltage (24V) compared to the AP1501-50K5L-13 (40V). Verify your input voltage specification before selection.

Q: Why do some substitutes have different switching frequencies? A: Switching frequency affects EMI characteristics, efficiency, and component sizing. The AP1501-50K5L-13 operates at 150kHz. Substitutes with different frequencies (52kHz or 200kHz) may require PCB layout and filtering adjustments. Verify compatibility with your power supply design.

Q: Are all listed substitutes ROHS3 compliant? A: Yes, all substitute parts listed maintain ROHS3 compliance and MSL-3 moisture sensitivity rating, matching the original part's environmental specifications.

Q: What is the advantage of LM2591HVS-5.0/NOPB over LM2575S-5.0/NOPB? A: LM2591HVS-5.0/NOPB supports higher input voltage (4.5V to 60V versus 4V to 40V) and operates at 150kHz switching frequency, matching the original part. LM2575S-5.0/NOPB operates at 52kHz. Select LM2591 if your application requires the extended input voltage range or lower EMI characteristics of 150kHz operation.

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