AP1501-33K5G-13 Equivalent & Substitute Parts

Part Overview

The AP1501-33K5G-13 is a buck switching regulator IC manufactured by Diodes Incorporated, delivering a fixed 3.3V output at 3A in a TO-263-6 (D2PAK) surface mount package. This part operates across a 4.5V to 40V input range with a 150kHz switching frequency and is compliant with RoHS3 standards. The product is currently in Last Time Buy status, making identification of functionally equivalent alternatives essential for design continuity and long-term supply chain planning.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Part Number	AP1501-33K5G-13
Function	Step-Down (Buck)
Output Voltage	3.3V Fixed
Output Current	3A
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
RoHS Status	RoHS3 Compliant
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the AP1501-33K5G-13 is determined by the following critical parameters:

Output Voltage: Must be fixed at 3.3V
Package: Must be TO-263-6 (D2PAK, 5 Leads + Tab)
Output Current: Minimum 3A capability required
Input Voltage Range: Must accommodate 4.5V to 40V minimum
Switching Frequency: 150kHz or higher acceptable
Mounting Type: Surface mount only
Compliance: RoHS3 compliant

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

Category A - Direct Current Match (3A Output): MIC4576-3.3WU, MIC4576-3.3WU-TR. These parts provide identical 3A output current, matching the original specification exactly.

Category B - Reduced Current Capability (1A to 1.7A Output): LM2575S-3.3/NOPB, LM2575SX-3.3/NOPB, LM2591HVS-3.3/NOPB, LM2591HVSX-3.3/NOPB, TL2575-33IKTTR, MIC4575-3.3WU, MIC4575-3.3WU-TR. These parts are suitable only where design current requirements do not exceed their rated output current.

All substitute parts share the same TO-263-6 package, fixed 3.3V output, and RoHS3 compliance as the original part.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Min)	Input Voltage (Max)	Switching Frequency	Operating Temperature	Package	Product Status
AP1501-33K5G-13	Diodes Incorporated	3A	4.5V	40V	150kHz	-20°C to 85°C	TO-263-6	Last Time Buy
MIC4576-3.3WU	Microchip Technology	3A	4V	36V	200kHz	-40°C to 85°C	TO-263-6	Active
MIC4576-3.3WU-TR	Microchip Technology	3A	4V	36V	200kHz	-40°C to 85°C	TO-263-6	Active
LM2575S-3.3/NOPB	Texas Instruments	1A	4V	40V	52kHz	-40°C to 125°C	TO-263-6	Active
LM2575SX-3.3/NOPB	Texas Instruments	1A	4V	40V	52kHz	-40°C to 125°C	TO-263-6	Active
LM2591HVS-3.3/NOPB	Texas Instruments	1A	4.5V	60V	150kHz	-40°C to 125°C	TO-263-6	Active
LM2591HVSX-3.3/NOPB	Texas Instruments	1A	4.5V	60V	150kHz	-40°C to 125°C	TO-263-6	Active
TL2575-33IKTTR	Texas Instruments	1A	4.75V	40V	52kHz	-40°C to 125°C	TO-263-6	Active
MIC4575-3.3WU	Microchip Technology	1.7A	4V	24V	200kHz	-40°C to 85°C	TO-263-6	Active
MIC4575-3.3WU-TR	Microchip Technology	1.7A	4V	24V	200kHz	-40°C to 85°C	TO-263-6	Active

Engineering Selection Recommendations

For Direct Replacement (3A Output Requirement)

MIC4576-3.3WU and MIC4576-3.3WU-TR are the primary equivalents. Both are manufactured by Microchip Technology and maintain the 3A output current specification. MIC4576-3.3WU-TR is supplied in Cut Tape & Digi-Reel packaging with 3,400 units in stock, while MIC4576-3.3WU is supplied in Tube packaging with 3,901 units available. Both parts are Active status with RoHS3 compliance. The MIC4576 series operates at 200kHz switching frequency versus the original 150kHz, and accepts input voltages from 4V to 36V, which covers the AP1501 operating range of 4.5V to 40V with the exception of the 36V to 40V upper band.

For Reduced Current Applications (1A to 1.7A Output)

When design requirements permit reduced output current, multiple alternatives exist across Texas Instruments and Microchip Technology product lines. Texas Instruments LM2591HVS-3.3/NOPB and LM2591HVSX-3.3/NOPB match the original 150kHz switching frequency and accept input voltages up to 60V, providing extended headroom beyond the original 40V specification. These parts are Active status with RoHS3 compliance and offer operating temperatures to -40°C to 125°C.

Microchip MIC4575-3.3WU and MIC4575-3.3WU-TR provide 1.7A output current with 200kHz switching frequency. Input voltage range is limited to 4V to 24V, which restricts use to lower input voltage applications.

Texas Instruments LM2575 series (LM2575S-3.3/NOPB, LM2575SX-3.3/NOPB, TL2575-33IKTTR) deliver 1A output with 52kHz switching frequency and are suitable for applications with minimal current demands. All are Active status with RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I use a 1A substitute part in place of the AP1501-33K5G-13 which is rated for 3A?

A: Only if your circuit design requires less than 1A of output current. The substitute part's current rating represents its maximum capability. Operating at or above the rated current will cause thermal stress and potential failure. Verify actual load current requirements before selecting a reduced-current alternative.

Q: Are all substitute parts in the same TO-263-6 package?

A: Yes. All listed substitute parts use the TO-263-6 (D2PAK, 5 Leads + Tab) package, ensuring identical PCB footprint and pin compatibility with the original AP1501-33K5G-13.

Q: What is the difference between MIC4576-3.3WU and MIC4576-3.3WU-TR?

A: Both parts are electrically identical with 3A output current. The difference is packaging format: MIC4576-3.3WU is supplied in Tube packaging, while MIC4576-3.3WU-TR is supplied in Cut Tape & Digi-Reel (TR) format. Select based on your assembly process requirements.

Q: The MIC4576 accepts input voltage only to 36V, but the AP1501 accepts 40V. Is this a problem?

A: This depends on your actual input voltage range. If your design operates within 4V to 36V, the MIC4576 is fully compatible. If your application requires operation between 36V and 40V, the MIC4576 is not suitable. Verify your system's maximum input voltage specification before substitution.

Q: Why do some substitutes have different switching frequencies?

A: Switching frequency affects output ripple, EMI characteristics, and component selection for external inductors and capacitors. The AP1501 operates at 150kHz. Substitutes operating at 52kHz (LM2575 series) or 200kHz (MIC4575/MIC4576 series) may require recalculation of external component values. Consult the substitute part's datasheet for recommended external component specifications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification, matching the original AP1501-33K5G-13 environmental compliance status.

Q: What is the difference between LM2591HVS-3.3/NOPB and LM2591HVSX-3.3/NOPB?

A: Both parts are electrically identical with 1A output current and 150kHz switching frequency. The difference is packaging format: LM2591HVS-3.3/NOPB is supplied in Tube packaging, while LM2591HVSX-3.3/NOPB is supplied in Cut Tape & Digi-Reel (TR) format. Select based on your assembly process requirements.

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