AP1512-33K5L-13 Equivalent & Substitute Parts

Part Overview

The AP1512-33K5L-13 is a buck switching regulator IC manufactured by Diodes Incorporated, rated for 3.3V fixed output at 2A maximum current. This part operates across a 4.5V to 60V input range with a 50kHz switching frequency in a TO-263-6 (D2PAK) surface mount package. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	AP1512-33K5L-13
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Function	Step-Down (Buck)
Output Voltage	3.3V Fixed
Output Current	2A
Input Voltage Range	4.5V to 60V
Switching Frequency	50kHz
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature	-20°C to 85°C (TA)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution for the AP1512-33K5L-13 is determined by the following critical parameters:

Output voltage: 3.3V fixed
Output current capability: minimum 2A
Input voltage range: 4.5V to 60V minimum
Package: TO-263-6 (D2PAK) surface mount
Topology: Buck (step-down) switching regulator
Synchronous rectifier: Not required
RoHS3 compliance and MSL-3 rating

Substitute parts must maintain compatibility across these parameters. Parts with lower current ratings (1A) are listed for reference but represent reduced capability. Parts with restricted input voltage ranges (below 4.5V minimum or below 60V maximum) represent functional limitations. All listed substitutes share the identical package footprint and fixed 3.3V output specification.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Min/Max)	Switching Frequency	Operating Temperature	Product Status	Package
AP1512-33K5L-13	Diodes Incorporated	2A	4.5V / 60V	50kHz	-20°C to 85°C	Obsolete	TO-263-6
LM2592HVS-3.3/NOPB	Texas Instruments	2A	4.5V / 60V	150kHz	-40°C to 125°C	Active	TO-263-6
LM2576-3.3WU-TR	Microchip Technology	3A	4V / 40V	52kHz	-40°C to 125°C	Active	TO-263-6
LM2576-3.3WU	Microchip Technology	3A	4V / 40V	52kHz	-40°C to 125°C	Active	TO-263-6
MIC4576-3.3WU-TR	Microchip Technology	3A	4V / 36V	200kHz	-40°C to 85°C	Active	TO-263-6
MIC4576-3.3WU	Microchip Technology	3A	4V / 36V	200kHz	-40°C to 85°C	Active	TO-263-6
MIC4575-3.3WU-TR	Microchip Technology	1.7A (Switch)	4V / 24V	200kHz	-40°C to 85°C	Active	TO-263-6
MIC4575-3.3WU	Microchip Technology	1.7A (Switch)	4V / 24V	200kHz	-40°C to 85°C	Active	TO-263-6
LM2591HVSX-3.3/NOPB	Texas Instruments	1A	4.5V / 60V	150kHz	-40°C to 125°C	Active	TO-263-6
LM2591HVS-3.3/NOPB	Texas Instruments	1A	4.5V / 60V	150kHz	-40°C to 125°C	Active	TO-263-6
LM2575HVSX-3.3/NOPB	Texas Instruments	1A	4V / 60V	52kHz	-40°C to 125°C	Active	TO-263-6

Engineering Selection Recommendations

Direct Equivalent (Matching 2A Output Current):

LM2592HVS-3.3/NOPB is the primary direct substitute. It maintains the 2A output current specification, supports the full 4.5V to 60V input range, and is in active production status. Operating temperature range extends to -40°C to 125°C, exceeding the original part's -20°C to 85°C specification. All compliance certifications (ROHS3, MSL-3) are maintained.

Higher Current Alternatives (3A Output Capability):

LM2576-3.3WU-TR, LM2576-3.3WU, MIC4576-3.3WU-TR, and MIC4576-3.3WU provide 3A output current, offering design margin above the 2A requirement. These parts are active production items with ROHS3 compliance. Input voltage range limitations must be evaluated: LM2576 series supports 4V to 40V, while MIC4576 series supports 4V to 36V. Both fall short of the original 60V maximum specification.

Lower Current Alternatives (1A Output Capability):

LM2591HVSX-3.3/NOPB, LM2591HVS-3.3/NOPB, and LM2575HVSX-3.3/NOPB are suitable only for applications where 1A output current is sufficient. These parts maintain the 4.5V to 60V input range and are active production items with extended temperature ratings.

Reduced Input Voltage Range Consideration:

MIC4575-3.3WU-TR and MIC4575-3.3WU support only 4V to 24V input range, restricting their use to lower voltage applications. These parts are not suitable for designs requiring the full 60V input capability of the original part.

Frequently Asked Questions (FAQ)

Q: Can LM2592HVS-3.3/NOPB directly replace AP1512-33K5L-13 without circuit modifications?

A: Yes. Both parts share identical output voltage (3.3V fixed), matching output current (2A), compatible input voltage range (4.5V to 60V), and identical package footprint (TO-263-6). Pin configuration and functional operation are compatible. The higher switching frequency (150kHz vs. 50kHz) may require component value adjustments in the output filter network, but this is a design optimization rather than a functional requirement.

Q: Why do some substitutes have lower maximum input voltage (40V or 36V vs. 60V)?

A: The LM2576 and MIC4576 series are designed for lower voltage applications. Designs requiring input voltages above 40V must use parts with 60V ratings such as LM2592HVS-3.3/NOPB or LM2591HVSX-3.3/NOPB.

Q: Are 1A-rated parts suitable replacements for a 2A design?

A: No. The LM2591 and LM2575 series are rated for 1A maximum output current. Using these parts in a 2A application will cause thermal stress and potential device failure. These parts are listed for reference only in applications where current requirements have been reduced.

Q: What is the difference between tube and tape & reel packaging?

A: Tube packaging is suitable for manual assembly and small-volume production. Tape & reel (TR) and Cut Tape (CT) & Digi-Reel packaging are designed for automated pick-and-place assembly. Both formats contain identical die and electrical specifications. Selection depends on manufacturing process requirements.

Q: Do all substitute parts maintain RoHS3 compliance?

A: Yes. All listed substitute parts are ROHS3 compliant and carry MSL-3 moisture sensitivity ratings, matching the original part's environmental compliance profile.

Q: Why is the MIC4575 series listed if it has reduced input voltage range?

A: MIC4575 parts offer buck-boost topology capability in addition to buck operation, providing design flexibility for applications with variable input voltage within the 4V to 24V range. However, this reduced range makes them unsuitable for designs requiring the full 60V input specification of the original part.

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