AP1501-K5L-13 Equivalent & Substitute Parts

Part Overview

The AP1501-K5L-13 is a buck switching regulator IC manufactured by Diodes Incorporated, rated for 3A output current in a TO-263-6 D2PAK package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The AP1501-K5L-13 operates as a positive adjustable step-down regulator with an input voltage range of 4.5V to 40V and adjustable output from 1.23V to 37V. Its 150kHz switching frequency and D2PAK surface mount packaging make it suitable for compact power management applications.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Part Number	AP1501-K5L-13
Category	Power Management (PMIC)
Function	Step-Down (Buck)
Output Configuration	Positive
Output Type	Adjustable
Current - Output	3A
Voltage - Input (Min)	4.5V
Voltage - Input (Max)	40V
Voltage - Output (Min/Fixed)	1.23V
Voltage - Output (Max)	37V
Frequency - Switching	150kHz
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount
Operating Temperature	-20°C ~ 125°C (TJ)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the AP1501-K5L-13 is determined by the following critical parameters:

Package Compatibility: All substitutes must use TO-263-6 D2PAK (5 Leads + Tab) surface mount packaging
Output Current Rating: Minimum 3A output current capacity
Voltage Range: Input 4.5V to 40V; adjustable output 1.23V to 37V
Topology: Buck (step-down) switching regulator
Output Configuration: Positive adjustable output
Switching Frequency: 150kHz operation
Thermal Operating Range: -20°C to 125°C minimum

Substitute parts are grouped into two categories:

Direct Equivalents (Same Current Rating - 3A): Parts with identical 3A output current capacity and matching electrical specifications. These provide one-to-one functional replacement.

Functional Alternatives (Lower Current Rating - 1A): Parts with reduced 1A output current capacity. These are suitable only for applications where the 3A rating is not required and current demand does not exceed 1A.

Parameter Comparison

Parameter	AP1501-K5L-13	AP1501-K5G-13	LM2596DSADJG	LM2596DSADJR4G	LM2575D2T-ADJG	LM2575D2T-ADJR4G	LM2575S-ADJ/NOPB	LM2575SX-ADJ/NOPB	LM2576D2T-ADJG	LM2576D2T-ADJR4G	TL2575-ADJIKTTR
Manufacturer	Diodes Inc.	Diodes Inc.	onsemi	onsemi	onsemi	onsemi	Texas Instruments	Texas Instruments	onsemi	onsemi	Texas Instruments
Function	Step-Down	Step-Down	Step-Up, Step-Down, Step-Up/Step-Down	Step-Up, Step-Down, Step-Up/Step-Down	Step-Down	Step-Down	Step-Down	Step-Down	Step-Down	Step-Down	Step-Down
Output Configuration	Positive	Positive	Positive or Negative	Positive or Negative	Positive	Positive	Positive	Positive	Positive or Negative	Positive or Negative	Positive
Current - Output	3A	3A	3A	3A	1A	1A	1A	1A	3A	3A	1A
Voltage - Input (Min)	4.5V	4.5V	4.5V	4.5V	4.75V	4.75V	4V	4V	7V	7V	4.75V
Voltage - Input (Max)	40V	40V	40V	40V	40V	40V	40V	40V	40V	40V	40V
Voltage - Output (Min/Fixed)	1.23V	1.23V	1.23V	1.23V	1.23V	1.23V	1.23V	1.23V	1.23V	1.23V	1.23V
Voltage - Output (Max)	37V	37V	37V	37V	37V	37V	37V	37V	37V	37V	37V
Frequency - Switching	150kHz	150kHz	150kHz	150kHz	52kHz	52kHz	52kHz	52kHz	52kHz	52kHz	52kHz
Package / Case	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-20°C ~ 125°C	-20°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Direct Equivalent: AP1501-K5G-13 (Diodes Incorporated) is the direct successor to the AP1501-K5L-13. Both parts share identical electrical specifications, 3A output current, and TO-263-6 D2PAK packaging. The AP1501-K5G-13 is active in production with 13,200 units in stock, making it the preferred replacement for obsolete AP1501-K5L-13 designs.

Multi-Topology Alternative: LM2596DSADJG and LM2596DSADJR4G (onsemi) provide 3A output current with expanded topology support (buck, boost, buck-boost configurations). These parts maintain identical voltage ranges and package compatibility. The LM2596DSADJR4G variant offers superior availability with 18,965 units in stock and improved moisture sensitivity rating (MSL 1 vs. MSL 3).

Lower Current Alternatives: LM2575D2T-ADJG, LM2575D2T-ADJR4G, LM2575S-ADJ/NOPB, LM2575SX-ADJ/NOPB, and TL2575-ADJIKTTR are suitable only for applications requiring 1A or less output current. These parts operate at 52kHz switching frequency and maintain full voltage range compatibility. LM2575SX-ADJ/NOPB provides the highest inventory availability at 35,200 units.

Higher Input Voltage Requirement: LM2576D2T-ADJG and LM2576D2T-ADJR4G require minimum 7V input voltage compared to 4.5V for the original part. These 3A-rated alternatives are suitable only when input voltage exceeds 7V. LM2576D2T-ADJR4G offers 26,331 units in stock.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements equivalent to the original AP1501-K5L-13.

Frequently Asked Questions (FAQ)

Q: Can I use a 1A-rated part as a direct replacement for the 3A AP1501-K5L-13?

A: No. The 1A-rated alternatives (LM2575 and TL2575 series) are suitable only for applications where output current demand does not exceed 1A. Using a 1A part in a 3A application will result in thermal stress, reduced efficiency, and potential device failure.

Q: What is the difference between AP1501-K5G-13 and AP1501-K5L-13?

A: Both parts are functionally identical with matching electrical specifications, voltage ranges, and 3A output current. The primary difference is product status: AP1501-K5L-13 is obsolete while AP1501-K5G-13 is active in production. The packaging designation differs (K5G vs. K5L), but both use TO-263-6 D2PAK.

Q: Why do LM2596 parts support multiple topologies while the original AP1501 does not?

A: The LM2596 is a multi-topology IC capable of buck, boost, and buck-boost operation through external component configuration. The AP1501 is a dedicated buck regulator. For buck-only applications, both provide equivalent functionality. The LM2596 offers design flexibility for future topology changes.

Q: Can I use LM2576D2T-ADJG if my input voltage is 5V?

A: No. The LM2576 series requires minimum 7V input voltage. At 5V input, the part will not operate within specification. Use AP1501-K5G-13, LM2596, or LM2575 series instead, which support 4.5V minimum input.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences?

A: MSL 3 (168 hours) requires moisture bake-out procedures before reflow soldering if the part has been exposed to humidity for extended periods. MSL 1 (unlimited) has no moisture sensitivity restrictions. onsemi parts (LM2596, LM2575D2T, LM2576) carry MSL 1, while Texas Instruments parts carry MSL 3. This affects storage and handling procedures but not electrical performance.

Q: Are there packaging format differences between substitutes?

A: All substitutes use TO-263-6 D2PAK (5 Leads + Tab) surface mount packaging with identical pinout and PCB footprint compatibility. Packaging format variations (Tube, Tape & Reel, Cut Tape) affect supply chain logistics but not electrical or mechanical compatibility.

Q: What switching frequency should I expect from substitute parts?

A: The original AP1501-K5L-13 operates at 150kHz. Direct equivalents (AP1501-K5G-13, LM2596) maintain 150kHz operation. Lower-current alternatives (LM2575, LM2576, TL2575) operate at 52kHz. Switching frequency affects filter component sizing and EMI characteristics. Verify filter design compatibility when switching to 52kHz alternatives.

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