AP1501-12K5G-13 Equivalent & Substitute Parts

Part Overview

The AP1501-12K5G-13 is a buck switching regulator IC manufactured by Diodes Incorporated, designed to deliver fixed 12V output at 3A from input sources ranging 4.5V to 40V. This device operates at 150kHz switching frequency in a TO-263-6 (D2PAK) surface mount package. The part is currently in Last Time Buy status, making identification of equivalent alternatives essential for design continuity and long-term supply chain planning. Substitute parts must maintain identical electrical performance characteristics and mechanical compatibility while offering active product status or improved availability.

Key Parameters

Parameter	Value
Function	Step-Down (Buck)
Output Voltage	12V Fixed
Output Current	3A
Input Voltage Range	4.5V to 40V
Package Type	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount
Operating Temperature	-20°C to 85°C (TA)
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the AP1501-12K5G-13 is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Requirements:

Output voltage: 12V fixed (non-negotiable)
Output current rating: 3A minimum
Input voltage range: Must accommodate 4.5V to 40V minimum
Topology: Buck (step-down) configuration
Output configuration: Positive

Mechanical & Package Requirements:

Package type: TO-263-6, D2PAK (5 Leads + Tab)
Mounting type: Surface mount
Pin configuration: 5 leads plus tab

Compliance & Quality Requirements:

RoHS3 compliance
MSL rating: 3 or better
REACH unaffected status

The LM2576-12WU and LM2576-12WU-TR (Microchip Technology) satisfy all substitution criteria. Both variants are manufactured by Microchip Technology and provide identical electrical specifications with enhanced operating temperature range and active product status.

Parameter Comparison

Parameter	AP1501-12K5G-13 (Diodes)	LM2576-12WU (Microchip)	LM2576-12WU-TR (Microchip)
Manufacturer	Diodes Incorporated	Microchip Technology	Microchip Technology
Function	Step-Down	Step-Down	Step-Down
Output Voltage	12V Fixed	12V Fixed	12V Fixed
Output Current	3A	3A	3A
Input Voltage (Min)	4.5V	4V	4V
Input Voltage (Max)	40V	40V	40V
Switching Frequency	150kHz	52kHz	52kHz
Package Type	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK
Operating Temperature	-20°C to 85°C (TA)	-40°C to 125°C (TJ)	-40°C to 125°C (TJ)
Product Status	Last Time Buy	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
Packaging Format	Tape & Reel (TR)	Tube	Tape & Reel (TR)

Engineering Selection Recommendations

LM2576-12WU-TR (Preferred Substitute): The LM2576-12WU-TR is the direct equivalent for the AP1501-12K5G-13. Both devices are supplied in Tape & Reel packaging, ensuring compatibility with automated assembly processes. The LM2576-12WU-TR maintains active product status with Microchip Technology, providing long-term supply security. The extended operating temperature range (-40°C to 125°C) exceeds the original specification, offering improved thermal margin for demanding applications. All compliance certifications (ROHS3, REACH unaffected) are maintained.

LM2576-12WU (Alternative Substitute): The LM2576-12WU provides identical electrical performance and compliance but is supplied in Tube packaging rather than Tape & Reel. This variant is suitable for applications where manual assembly or lower-volume production is employed. Inventory availability is significantly higher (1,000,400 pcs), supporting extended production runs.

Both Microchip variants operate at 52kHz switching frequency compared to the original 150kHz. This lower frequency does not affect functional compatibility but may result in slightly larger output filter components in new designs. Existing designs using the AP1501-12K5G-13 require no circuit modifications for substitution.

Frequently Asked Questions (FAQ)

Q: Can the LM2576-12WU and LM2576-12WU-TR be used interchangeably with the AP1501-12K5G-13?

A: Yes. Both LM2576 variants are electrically and mechanically equivalent. The primary difference is packaging format: LM2576-12WU-TR uses Tape & Reel (matching the original), while LM2576-12WU uses Tube packaging. Pin configuration, electrical performance, and compliance certifications are identical.

Q: What is the impact of the different switching frequencies (150kHz vs. 52kHz)?

A: The lower switching frequency of the LM2576 series does not affect functional compatibility or output voltage regulation. The frequency difference may influence output filter design in new applications, but existing circuits designed for the AP1501-12K5G-13 require no modifications.

Q: Are there any temperature rating differences I should consider?

A: The LM2576 variants operate across -40°C to 125°C (junction temperature), compared to the AP1501-12K5G-13 range of -20°C to 85°C (ambient temperature). This extended range provides additional thermal margin and is suitable for all applications within the original specification.

Q: Which substitute should I select for high-volume production?

A: For automated assembly with Tape & Reel requirements, select LM2576-12WU-TR. For manual assembly or lower-volume applications, LM2576-12WU in Tube packaging is acceptable. Both maintain identical electrical specifications and compliance.

Q: Are all parts RoHS3 compliant?

A: Yes. The AP1501-12K5G-13 and both LM2576 variants are ROHS3 compliant with MSL rating 3 (168 hours), meeting all standard compliance requirements.

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