AP1506-50K5L-13 Equivalent & Substitute Parts

Part Overview

The AP1506-50K5L-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.

The AP1506-50K5L-13 functions as a step-down (buck) converter with positive fixed output configuration, suitable for power management applications requiring regulated 5V rails from higher input voltage sources.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Part Number	AP1506-50K5L-13
Function	Step-Down (Buck)
Output Voltage	5V Fixed
Output Current	3A
Package Type	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution for the AP1506-50K5L-13 is determined by the following critical parameters:

Output voltage: 5V fixed
Output current capability: 3A minimum
Package: TO-263-6 (D2PAK, 5 leads + tab)
Mounting: Surface mount
Topology: Buck (step-down)
Output configuration: Positive fixed

Parts meeting these criteria are grouped into two categories: direct Diodes Incorporated variants and cross-manufacturer alternatives from Texas Instruments and Microchip Technology. Parts with lower current ratings (1A, 1.7A) are listed as functional alternatives where current requirements permit derating.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage Range	Switching Frequency	Package	Product Status
AP1506-50K5L-13	Diodes Incorporated	5V	3A	Not specified	Not specified	TO-263-6	Obsolete
AP1506-50K5G-13	Diodes Incorporated	5V	3A	4.5V – 22V	150kHz	TO-263-6	Last Time Buy
MIC4576-5.0WU	Microchip Technology	5V	3A	4V – 36V	200kHz	TO-263-6	Active
LM2591HVS-5.0/NOPB	Texas Instruments	5V	1A	4.5V – 60V	150kHz	TO-263-6	Active
LM2591HVSX-5.0/NOPB	Texas Instruments	5V	1A	4.5V – 60V	150kHz	TO-263-6	Active
MIC4575-5.0WU-TR	Microchip Technology	5V	1.7A	4V – 24V	200kHz	TO-263-6	Active
TL2575-05IKTTR	Texas Instruments	5V	1A	4.75V – 40V	52kHz	TO-263-6	Active
TL2575-05IKTTRG3	Texas Instruments	5V	1A	4.75V – 40V	52kHz	TO-263-6	Active
TL2575HV-05IKTTR	Texas Instruments	5V	1A	4.75V – 60V	52kHz	TO-263-6	Active
TL2575HV-05QKTTRQ1	Texas Instruments	5V	1A	4.75V – 60V	52kHz	TO-263-6	Active

Engineering Selection Recommendations

Primary Substitute (Full Current Rating): MIC4576-5.0WU is the recommended substitute for applications requiring the full 3A output current specification. This part maintains identical output voltage and current ratings, uses the same TO-263-6 package, and carries active product status with ROHS3 compliance and MSL 3 rating matching the original part.

Secondary Substitutes (Reduced Current Rating): For applications where output current can be derated below 3A, the following parts are suitable:

LM2591HVS-5.0/NOPB and LM2591HVSX-5.0/NOPB (Texas Instruments, 1A rated) provide extended input voltage range to 60V and active product status.
TL2575HV-05IKTTR and TL2575HV-05QKTTRQ1 (Texas Instruments, 1A rated) support 60V maximum input and include automotive-grade qualification (AEC-Q100) for TL2575HV-05QKTTRQ1.
MIC4575-5.0WU-TR (Microchip Technology, 1.7A rated) offers intermediate current capability with 200kHz switching frequency.

Diodes Incorporated Alternative: AP1506-50K5G-13 is a direct variant from the same manufacturer with identical electrical specifications and 3A rating, though classified as Last Time Buy status.

All substitute parts maintain ROHS3 compliance, MSL 3 rating, and surface mount TO-263-6 packaging required for direct PCB replacement.

Frequently Asked Questions (FAQ)

Q: Can I use a 1A-rated part as a substitute for the 3A AP1506-50K5L-13? A: Only if your application circuit draws less than 1A continuous output current. The 1A-rated parts (LM2591 and TL2575 series) are electrically compatible but thermally limited to lower current levels. Exceeding rated current causes thermal stress and potential device failure.

Q: What is the difference between TL2575-05IKTTR and TL2575HV-05IKTTR? A: Both are Texas Instruments buck regulators with identical 5V output and 1A rating in TO-263-6 packages. The HV variant supports maximum input voltage of 60V compared to 40V for the standard variant. Select based on your input voltage requirements.

Q: Is TL2575HV-05QKTTRQ1 suitable for automotive applications? A: Yes. This part carries AEC-Q100 automotive qualification and is available in Tape & Reel packaging. It meets automotive-grade reliability standards while maintaining the same electrical specifications as other TL2575HV variants.

Q: Why does MIC4576-5.0WU have a higher switching frequency (200kHz) than the original part? A: The original AP1506-50K5L-13 switching frequency is not specified in available documentation. MIC4576-5.0WU operates at 200kHz, which is standard for modern buck regulators and does not affect functional compatibility. Higher switching frequency typically reduces output filter component size.

Q: Can I mix packaging types (Tube, Tape & Reel, Cut Tape) when ordering substitutes? A: Yes. Packaging type affects handling and storage but does not change electrical performance. Select packaging based on your assembly process requirements and inventory management practices.

Q: Are all listed substitutes ROHS3 compliant? A: Yes. All substitute parts listed carry ROHS3 compliance certification matching the original AP1506-50K5L-13.

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