AP3003S-ADJTRE1 Equivalent & Substitute Parts

Part Overview

The AP3003S-ADJTRE1 is a buck switching regulator IC from Diodes Incorporated, designed for positive adjustable output applications with 3A output current capability. This device operates in the 4.5V to 25V input range and delivers adjustable output from 1.23V to 25V. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Function	Step-Down (Buck)
Output Configuration	Positive Adjustable
Number of Outputs	1
Current - Output	3A
Voltage - Input (Min/Max)	4.5V / 25V
Voltage - Output (Min/Max)	1.23V / 25V
Frequency - Switching	150kHz
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AP3003S-ADJTRE1 is determined by the following critical parameters:

Topology: Buck switching regulator
Output Type: Positive adjustable
Output Current: 3A minimum
Package: TO-263-6, D2PAK (5 Leads + Tab)
Mounting: Surface Mount
Output Voltage Range: Minimum 1.23V adjustable capability
Input Voltage Range: Minimum 4.5V support

The substitute parts listed below meet or exceed these core requirements while maintaining functional and mechanical compatibility. Differences in maximum input voltage, maximum output voltage, switching frequency, and operating temperature ranges are within acceptable engineering tolerances for this application category.

Parameter Comparison

Parameter	AP3003S-ADJTRE1	AP1501-K5G-13	MIC4576WU-TR
Manufacturer	Diodes Incorporated	Diodes Incorporated	Microchip Technology
Product Status	Obsolete	Active	Active
Function	Step-Down	Step-Down	Step-Down
Output Configuration	Positive Adjustable	Positive Adjustable	Positive Adjustable
Number of Outputs	1	1	1
Current - Output	3A	3A	3A
Voltage - Input (Min)	4.5V	4.5V	4V
Voltage - Input (Max)	25V	40V	36V
Voltage - Output (Min/Fixed)	1.23V	1.23V	1.23V
Voltage - Output (Max)	25V	37V	33V
Frequency - Switching	150kHz	150kHz	200kHz
Synchronous Rectifier	No	No	No
Operating Temperature	-40°C ~ 85°C (TA)	-20°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)
Package / Case	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

AP1501-K5G-13 (Diodes Incorporated): This part is the direct manufacturer equivalent from Diodes Incorporated and carries active product status. It maintains identical switching frequency and output current specifications while offering extended maximum input voltage (40V vs. 25V) and output voltage (37V vs. 25V) capabilities. The operating temperature range extends to 125°C junction temperature, providing broader thermal performance. This part is recommended for designs requiring continued support from the original manufacturer.

MIC4576WU-TR (Microchip Technology): This cross-manufacturer substitute from Microchip Technology is actively supported and provides equivalent core functionality. It operates at a higher switching frequency of 200kHz compared to the original 150kHz specification, which may result in reduced output filter component sizes. Input voltage range extends to 36V and output voltage to 33V. Operating temperature range matches the original specification at -40°C to 85°C. This part is suitable for applications where cross-manufacturer sourcing is acceptable and higher switching frequency is compatible with circuit design.

Both substitute parts maintain ROHS3 compliance, identical moisture sensitivity levels, and the same TO-263-6 D2PAK package footprint, ensuring direct mechanical and electrical compatibility with existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can AP1501-K5G-13 be used as a direct replacement for AP3003S-ADJTRE1?

A: Yes. Both parts share identical output current (3A), switching frequency (150kHz), minimum input voltage (4.5V), minimum output voltage (1.23V), and package configuration (TO-263-6 D2PAK). The AP1501-K5G-13 has higher maximum voltage ratings and active product status, making it a suitable direct replacement.

Q: What is the primary difference between AP1501-K5G-13 and MIC4576WU-TR?

A: The primary differences are manufacturer (Diodes Incorporated vs. Microchip Technology), switching frequency (150kHz vs. 200kHz), and maximum voltage ratings. Both maintain 3A output current and identical minimum voltage specifications. The higher switching frequency of the MIC4576WU-TR may allow for smaller passive component values in the output filter stage.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the TO-263-6 D2PAK package with 5 leads plus tab, ensuring identical pinout and PCB footprint compatibility.

Q: Does the higher switching frequency of MIC4576WU-TR affect circuit design?

A: The 200kHz switching frequency of MIC4576WU-TR compared to 150kHz of the original part may require recalculation of output filter component values to maintain equivalent ripple voltage and noise characteristics. Circuit topology and feedback network remain unchanged.

Q: Are all substitute parts RoHS compliant?

A: Yes. AP1501-K5G-13 and MIC4576WU-TR are both ROHS3 compliant with identical moisture sensitivity levels (MSL 3, 168 hours) to the original AP3003S-ADJTRE1.

Q: Which substitute part should be selected for new designs?

A: AP1501-K5G-13 is recommended for new designs requiring continued support from Diodes Incorporated with extended voltage and temperature ratings. MIC4576WU-TR is suitable when cross-manufacturer sourcing is preferred or when the higher switching frequency provides design advantages.

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