LM2575S-ADJ Buck Switching Regulator IC Equivalent & Substitute Parts

Part Overview

The LM2575S-ADJ is a buck switching regulator IC from Texas Instruments, classified as a positive adjustable step-down converter with 1A output capacity in TO-263-6 (D2PAK) packaging. This device operates across a 4V to 40V input range with adjustable output from 1.23V to 37V, featuring a 52kHz switching frequency and non-synchronous rectifier topology. The part is currently in Last Time Buy status with 2,288 units in stock. Alternative equivalent parts are necessary for design flexibility, supply chain continuity, and application-specific requirements such as higher current capacity or different packaging options.

Key Parameters

Parameter	Value
Function	Step-Down (Buck)
Output Configuration	Positive
Output Type	Adjustable
Number of Outputs	1
Voltage - Input (Min)	4V
Voltage - Input (Max)	40V
Voltage - Output (Min/Fixed)	1.23V
Voltage - Output (Max)	37V
Current - Output	1A
Frequency - Switching	52kHz
Synchronous Rectifier	No
Operating Temperature	-40°C ~ 125°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the LM2575S-ADJ is determined by the following critical parameters:

Primary Substitution Criteria:

Function: Step-Down (Buck) topology
Output Configuration: Positive adjustable output
Output Voltage Range: Minimum 1.23V, maximum 37V
Package / Case: TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Input voltage range (minimum 4V, maximum 40V)
Output current capacity (1A or higher)
Switching frequency (52kHz nominal)
Operating temperature range (-40°C to 125°C)
RoHS3 compliance and MSL rating

Substitute parts are grouped into three categories:

Category 1: Direct Equivalents (1A Output, 52kHz) Parts with identical output current and switching frequency, differing only in manufacturer or packaging format.

Category 2: Higher Current Alternatives (3A Output, 52kHz) Parts with increased output current capacity while maintaining 52kHz switching frequency, suitable for applications requiring higher load current.

Category 3: Higher Current with Increased Frequency (3A-5A Output, 150kHz) Parts with both increased current capacity and higher switching frequency, offering improved efficiency and smaller component sizing.

Parameter Comparison

Part Number	Manufacturer	Output Current	Switching Frequency	Input Voltage (Min-Max)	Output Voltage (Min-Max)	Operating Temperature	Package	Product Status
LM2575S-ADJ	Texas Instruments	1A	52kHz	4V - 40V	1.23V - 37V	-40°C ~ 125°C	TO-263-6	Last Time Buy
LM2575S-ADJ/NOPB	Texas Instruments	1A	52kHz	4V - 40V	1.23V - 37V	-40°C ~ 125°C	TO-263-6	Active
LM2575D2T-ADJG	onsemi	1A	52kHz	4.75V - 40V	1.23V - 37V	-40°C ~ 125°C	D2PAK-5	Active
LM2575D2T-ADJR4G	onsemi	1A	52kHz	4.75V - 40V	1.23V - 37V	-40°C ~ 125°C	D2PAK-5	Active
LM2575WU-TR	Microchip Technology	1A	52kHz	4V - 40V	1.23V - 37V	-40°C ~ 125°C	TO-263-5	Active
LM2576D2T-ADJG	onsemi	3A	52kHz	7V - 40V	1.23V - 37V	-40°C ~ 125°C	D2PAK-5	Active
LM2576D2T-ADJR4G	onsemi	3A	52kHz	7V - 40V	1.23V - 37V	-40°C ~ 125°C	D2PAK-5	Active
LM2576WU	Microchip Technology	3A	52kHz	4V - 40V	1.23V - 37V	-40°C ~ 125°C	TO-263-5	Active
LM2576WU-TR	Microchip Technology	3A	52kHz	4V - 40V	1.23V - 37V	-40°C ~ 125°C	TO-263-5	Active
AP1501-K5G-13	Diodes Incorporated	3A	150kHz	4.5V - 40V	1.23V - 37V	-20°C ~ 125°C	TO-263-5	Active
AP1501A-K5G-13	Diodes Incorporated	5A	150kHz	4.5V - 40V	1.23V - 37V	-20°C ~ 85°C	TO-263-5	Not For New Designs

Engineering Selection Recommendations

For Direct Replacement (1A Applications): Select LM2575S-ADJ/NOPB from Texas Instruments for active product status with identical electrical specifications. Alternatively, LM2575D2T-ADJG or LM2575D2T-ADJR4G from onsemi provide equivalent performance with improved MSL rating (1 vs. 3). LM2575WU-TR from Microchip Technology offers tape and reel packaging for high-volume production environments.

For Higher Current Requirements (3A Applications): LM2576D2T-ADJR4G or LM2576D2T-ADJG from onsemi maintain 52kHz switching frequency with 3A output capacity. Note minimum input voltage increases to 7V. LM2576WU or LM2576WU-TR from Microchip Technology support 4V minimum input with 3A output, offering greater input voltage flexibility.

For Advanced Performance (3A-5A, Higher Frequency): AP1501-K5G-13 from Diodes Incorporated provides 3A output at 150kHz switching frequency with active product status. AP1501A-K5G-13 extends to 5A output but carries "Not For New Designs" status and reduced operating temperature range (-20°C to 85°C), limiting suitability for new applications.

Compliance and Certification: All recommended substitutes maintain ROHS3 compliance and REACH unaffected status. MSL ratings vary: onsemi D2PAK variants offer MSL 1 (unlimited), while Texas Instruments and Microchip variants specify MSL 3 (168 hours). Select based on storage and assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can LM2576 series parts directly replace LM2575S-ADJ? A: LM2576 parts are electrically compatible but feature 3A output versus 1A. They are suitable for applications requiring higher current. However, LM2576 minimum input voltage is 7V compared to LM2575's 4V, which may restrict use in lower input voltage applications.

Q: What is the difference between D2PAK-5 and TO-263-5 packaging? A: Both designations refer to the same physical package: TO-263-6 with 5 leads plus tab. D2PAK-5 is the onsemi nomenclature; TO-263-5 is the generic industry standard. They are mechanically and electrically interchangeable.

Q: Why do onsemi parts have lower MSL ratings? A: onsemi D2PAK variants specify MSL 1 (unlimited moisture sensitivity), indicating superior moisture resistance compared to MSL 3 (168 hours). This provides extended shelf life and reduced risk of moisture-induced failures during storage and assembly.

Q: Is AP1501-K5G-13 suitable for new designs? A: Yes. AP1501-K5G-13 carries active product status and is recommended for new designs. AP1501A-K5G-13 is marked "Not For New Designs" and should be avoided for new applications.

Q: What are the implications of 150kHz switching frequency in AP1501 parts? A: Higher switching frequency (150kHz vs. 52kHz) enables smaller inductor and capacitor components, reducing board space and cost. However, it increases switching losses and EMI. Select based on application thermal and EMI requirements.

Q: Can I use LM2575WU-TR in applications requiring 4V minimum input? A: Yes. LM2575WU-TR from Microchip Technology supports 4V minimum input, matching the original LM2575S-ADJ specification. This is preferable to onsemi variants (4.75V minimum) for low input voltage applications.

Q: What packaging options are available for high-volume production? A: Tape & Reel (TR) packaging is available for LM2575D2T-ADJR4G, LM2575WU-TR, LM2576D2T-ADJR4G, LM2576WU-TR, and AP1501-K5G-13. Tube packaging is available for LM2575S-ADJ/NOPB, LM2575D2T-ADJG, LM2576D2T-ADJG, and LM2576WU.

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