AP1501A-50K5L-13 Equivalent & Substitute Parts

Part Overview

The AP1501A-50K5L-13 is a buck switching regulator IC manufactured by Diodes Incorporated, designed for positive fixed 5V output at 5A in a TO-263-6 D2PAK package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs or production continuity. The device operates across an input voltage range of 4.5V to 40V with a switching frequency of 150kHz and is suitable for surface mount applications requiring step-down voltage regulation.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Part Number	AP1501A-50K5L-13
Function	Step-Down (Buck)
Output Voltage	5V Fixed
Output Current	5A
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)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the AP1501A-50K5L-13 is determined by the following critical parameters:

Output voltage: 5V fixed
Package compatibility: TO-263-6 D2PAK (5 Leads + Tab)
Topology: Buck switching regulator
Output configuration: Positive
Surface mount capability
RoHS3 compliance

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

Category 1: Direct Current Rating Match (5A Output) The AP1501A-50K5G-13 from Diodes Incorporated provides identical electrical specifications with active product status and higher inventory availability.

Category 2: Reduced Current Rating (1A to 3A Output) Parts from onsemi (LM2575 series) and Texas Instruments (LM2575 SIMPLE SWITCHER series) offer compatible package and voltage specifications but with lower output current ratings. The Microchip LM2576 series provides 3A output current, bridging the gap between 1A and 5A ratings.

Parameter Comparison

Parameter	AP1501A-50K5L-13	AP1501A-50K5G-13	LM2575D2T-5G	LM2575HVS-5.0/NOPB	LM2576-5.0WU	LM2576D2T-005G
Manufacturer	Diodes Inc.	Diodes Inc.	onsemi	Texas Instruments	Microchip	onsemi
Output Voltage	5V	5V	5V	5V	5V	5V
Output Current	5A	5A	1A	1A	3A	3A
Input Voltage (Min)	4.5V	4.5V	4.75V	4V	4V	7V
Input Voltage (Max)	40V	40V	40V	60V	40V	40V
Switching Frequency	150kHz	150kHz	52kHz	52kHz	52kHz	52kHz
Package	TO-263-6	TO-263-6	TO-263-6	TO-263-6	TO-263-6	TO-263-6
Operating Temperature	-20°C to 85°C	-20°C to 85°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3

Engineering Selection Recommendations

Primary Recommendation: AP1501A-50K5G-13 This Diodes Incorporated part is the direct functional equivalent with identical electrical specifications and package. It maintains the 5A output current rating, 150kHz switching frequency, and -20°C to 85°C operating temperature range. Active product status with 16,200 units in stock ensures supply continuity. ROHS3 compliance and identical MSL rating (3, 168 Hours) support seamless design migration.

Secondary Recommendation: LM2576 Series (Microchip) The LM2576-5.0WU and LM2576-5.0WU-TR provide 3A output current in the same TO-263-6 package with active product status. These parts support the full 4V to 40V input range and offer extended operating temperature (-40°C to 125°C). Suitable for applications where 3A output current is sufficient. MSL rating of 3 (168 Hours) matches the original part.

Tertiary Recommendation: LM2575 Series (onsemi and Texas Instruments) The LM2575D2T-5G, LM2575HVS-5.0/NOPB, and LM2575SX-5.0/NOPB deliver 1A output current in compatible TO-263-6 packaging. These parts are appropriate only for designs requiring reduced output current. onsemi variants feature MSL 1 (Unlimited), while Texas Instruments variants maintain MSL 3 (168 Hours). All variants are ROHS3 compliant with active product status.

Frequently Asked Questions (FAQ)

Q: Can the AP1501A-50K5G-13 be used as a direct replacement for the AP1501A-50K5L-13? A: Yes. Both parts share identical electrical specifications, package configuration, and output current rating of 5A. The primary difference is product status: AP1501A-50K5G-13 is active with higher inventory availability, while AP1501A-50K5L-13 is obsolete.

Q: What is the impact of using LM2576 (3A) instead of the original 5A part? A: The LM2576 series reduces maximum output current from 5A to 3A. This substitution is valid only if your application's load current does not exceed 3A. All other electrical parameters, including input voltage range, output voltage, and package, remain compatible.

Q: Why do LM2575 parts have lower output current (1A) compared to the original (5A)? A: The LM2575 is a lower-current variant within the same buck regulator family. Use LM2575 parts only if your design requires 1A or less output current. For higher current demands, select LM2576 (3A) or AP1501A-50K5G-13 (5A).

Q: Are all substitute parts in the same TO-263-6 package? A: Yes. All recommended substitutes use the TO-263-6 D2PAK (5 Leads + Tab) package, ensuring mechanical and electrical compatibility with existing PCB layouts.

Q: What is the difference between onsemi LM2575D2T-5G and Texas Instruments LM2575HVS-5.0/NOPB? A: Both deliver 1A output at 5V in TO-263-6 packaging. The onsemi variant supports 4.75V minimum input and features MSL 1 (Unlimited). The Texas Instruments variant supports 4V minimum input with wider 60V maximum input range and MSL 3 (168 Hours). Select based on your input voltage requirements and moisture sensitivity constraints.

Q: Is the switching frequency difference between 150kHz (original) and 52kHz (substitutes) significant? A: Yes. The original AP1501A-50K5L-13 operates at 150kHz, while most substitutes operate at 52kHz. This affects output filter design, EMI characteristics, and efficiency. Verify that your PCB layout and filtering components are compatible with the lower switching frequency before substitution.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All recommended substitutes carry ROHS3 compliance certification, matching the original part's environmental compliance status.

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