LM2575M-ADJ Buck Switching Regulator IC Equivalent & Substitute Parts

Part Overview

The LM2575M-ADJ is a buck switching regulator IC from Texas Instruments, part of the SIMPLE SWITCHER® series. This positive adjustable step-down regulator delivers 1A output current with an adjustable output voltage range from 1.23V to 37V, operating from a 4V to 40V input supply. The device is housed in a 24-SOIC surface mount package with a switching frequency of 52kHz.

The LM2575M-ADJ is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this regulator topology.

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
Operating Temperature	-40°C ~ 125°C (TJ)
Package / Case	24-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the LM2575M-ADJ are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Parameters for Substitution:

Function: Step-Down (Buck) topology
Output Configuration: Positive
Output Type: Adjustable
Number of Outputs: 1
Voltage - Input Range: 4V to 40V
Voltage - Output Range: 1.23V to 37V
Current - Output: 1A
Switching Frequency: 52kHz
Operating Temperature Range: -40°C ~ 125°C (TJ)
Package / Case: 24-SOIC (0.295", 7.50mm Width)
Mounting Type: Surface Mount

All identified substitute parts match these parameters exactly, ensuring functional and mechanical compatibility with the original LM2575M-ADJ design.

Parameter Comparison

Parameter	LM2575M-ADJ	LM2575M-ADJ/NOPB	LM2575YWM-TR
Manufacturer	Texas Instruments	Texas Instruments	Microchip Technology
Product Status	Obsolete	Active	Active
Function	Step-Down	Step-Down	Step-Down
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Number of Outputs	1	1	1
Voltage - Input (Min)	4V	4V	4V
Voltage - Input (Max)	40V	40V	40V
Voltage - Output (Min/Fixed)	1.23V	1.23V	1.23V
Voltage - Output (Max)	37V	37V	37V
Current - Output	1A	1A	1A
Frequency - Switching	52kHz	52kHz	52kHz
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	24-SOIC (0.295", 7.50mm Width)	24-SOIC (0.295", 7.50mm Width)	24-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	2 (1 Year)
Packaging Type	-	Tube	Tape & Reel (TR)

Engineering Selection Recommendations

LM2575M-ADJ/NOPB (Texas Instruments): This part is a direct substitute from the original manufacturer. It maintains identical electrical specifications and package configuration. The primary distinction is active product status and ROHS3 compliance, making it suitable for new designs and applications requiring RoHS certification. Packaging is supplied in tube format.

LM2575YWM-TR (Microchip Technology): This part provides equivalent electrical performance and package compatibility. As an active product with ROHS3 compliance, it supports long-term supply chain continuity. The Moisture Sensitivity Level is improved to MSL 2 (1 Year) compared to the original MSL 3 (168 Hours). Packaging is supplied in Tape & Reel format, suitable for automated assembly processes.

Both substitute parts are functionally interchangeable with the LM2575M-ADJ based on matching electrical and mechanical parameters.

Frequently Asked Questions (FAQ)

Q: Can LM2575M-ADJ/NOPB be used as a direct replacement for LM2575M-ADJ?

A: Yes. The LM2575M-ADJ/NOPB matches all critical electrical and mechanical parameters of the original part, including input/output voltage ranges, output current, switching frequency, operating temperature range, and 24-SOIC package configuration. The primary difference is product status (active vs. obsolete) and RoHS compliance.

Q: What is the difference between LM2575M-ADJ/NOPB and LM2575YWM-TR?

A: Both parts are electrically equivalent with identical voltage, current, and frequency specifications. The differences are: manufacturer (Texas Instruments vs. Microchip Technology), packaging format (Tube vs. Tape & Reel), and Moisture Sensitivity Level (MSL 3 vs. MSL 2). The Microchip part offers improved moisture handling characteristics.

Q: Are there any compatibility concerns when substituting these parts?

A: No compatibility concerns exist for the identified substitutes. All parts share the same 24-SOIC package footprint, pin configuration, and electrical performance specifications. PCB layout and circuit design remain unchanged.

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

A: Selection depends on supply chain and manufacturing requirements. LM2575M-ADJ/NOPB provides continuity with the original Texas Instruments design. LM2575YWM-TR offers improved moisture sensitivity characteristics and Tape & Reel packaging for automated assembly. Both are active products with RoHS3 compliance.

Q: What is the significance of RoHS compliance for these parts?

A: The original LM2575M-ADJ is RoHS non-compliant. Both substitute parts (LM2575M-ADJ/NOPB and LM2575YWM-TR) are ROHS3 compliant, meeting environmental and regulatory requirements for applications subject to RoHS directives.

Q: How does Moisture Sensitivity Level (MSL) affect part selection?

A: MSL indicates the maximum time a component can be exposed to moisture at specified temperature and humidity conditions before soldering. The original part has MSL 3 (168 Hours). LM2575M-ADJ/NOPB maintains MSL 3, while LM2575YWM-TR offers MSL 2 (1 Year), providing extended shelf life and reduced risk of moisture-related failures during storage and handling.

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