LM2575S-12 Buck Switching Regulator IC Equivalent & Substitute Parts

Part Overview

The LM2575S-12 is a buck switching regulator IC manufactured by Texas Instruments, designed for positive fixed 12V output at 1A current capacity. This component belongs to the SIMPLE SWITCHER® series and operates as a step-down topology power management IC in a TO-263-6 (D2PAK) surface mount package.

The LM2575S-12 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Substitute parts must maintain electrical compatibility across input voltage range, output voltage specification, switching frequency, and thermal operating conditions while accommodating packaging and manufacturer variations.

Key Parameters

Parameter	Value
Function	Step-Down (Buck)
Output Configuration	Positive
Output Type	Fixed
Output Voltage	12V
Output Current	1A
Input Voltage Range	4V to 40V
Switching Frequency	52kHz
Operating Temperature	-40°C to 125°C (TJ)
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount
Synchronous Rectifier	No

Substitute Part Grouping Explanation

Substitution eligibility for the LM2575S-12 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Output voltage: 12V fixed
Topology: Buck (step-down)
Output configuration: Positive
Switching frequency: 52kHz
Operating temperature range: -40°C to 125°C (TJ)
Synchronous rectifier: No

Mechanical Compatibility Requirements:

Package / Case: TO-263-6, D2PAK (5 Leads + Tab)
Mounting type: Surface Mount

Current Rating Consideration: Parts with output current ratings of 1A or greater are electrically compatible. Parts rated at 3A (LM2576 series) are direct substitutes with enhanced current capability and maintain all other electrical parameters.

Packaging Variation Allowance: Supplier device package variations (TO-263 DDPAK-5, D2PAK-5) are acceptable provided the physical footprint and pin configuration remain compatible with TO-263-6 specifications.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Min)	Input Voltage (Max)	Output Voltage	Switching Frequency	Package	Product Status	RoHS Status
LM2575S-12	Texas Instruments	1A	4V	40V	12V	52kHz	TO-263-6, D2PAK	Obsolete	Non-compliant
LM2575S-12/NOPB	Texas Instruments	1A	4V	40V	12V	52kHz	TO-263-6, D2PAK	Active	ROHS3 Compliant
LM2575-12WU-TR	Microchip Technology	1A	4V	40V	12V	52kHz	TO-263-6, D2PAK	Active	ROHS3 Compliant
LM2575D2T-12R4G	onsemi	1A	4.75V	40V	12V	52kHz	TO-263-6, D2PAK	Active	ROHS3 Compliant
LM2576-12WU	Microchip Technology	3A	4V	40V	12V	52kHz	TO-263-6, D2PAK	Active	ROHS3 Compliant
LM2576-12WU-TR	Microchip Technology	3A	4V	40V	12V	52kHz	TO-263-6, D2PAK	Active	ROHS3 Compliant
LM2576D2TR4-012G	onsemi	3A	7V	40V	12V	52kHz	TO-263-6, D2PAK	Active	ROHS3 Compliant
NCV2575D2T-12R4G	onsemi	1A	4.75V	40V	12V	52kHz	TO-263-6, D2PAK	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (1A Output Current):

LM2575S-12/NOPB is the primary direct replacement. This part maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance, addressing the obsolescence of the original LM2575S-12.

LM2575-12WU-TR (Microchip Technology) and LM2575D2T-12R4G (onsemi) are functionally equivalent alternatives with active product status and ROHS3 compliance. Both maintain the 1A output current specification and 52kHz switching frequency. LM2575D2T-12R4G specifies a minimum input voltage of 4.75V compared to 4V for other variants; this represents a minor operational constraint in applications requiring operation below 4.75V input.

Enhanced Current Capacity Substitutes (3A Output Current):

LM2576-12WU, LM2576-12WU-TR (Microchip Technology), and LM2576D2TR4-012G (onsemi) provide 3A output current capability while maintaining all other electrical parameters. These parts are suitable for designs requiring higher current delivery or for applications where design margin improvement is beneficial. All three maintain active product status and ROHS3 compliance.

LM2576D2TR4-012G specifies a minimum input voltage of 7V; applications requiring operation below 7V input voltage must use alternative substitutes.

Obsolete Status Consideration:

NCV2575D2T-12R4G is classified as obsolete and should be avoided for new designs despite ROHS3 compliance and active inventory availability.

Frequently Asked Questions (FAQ)

Q: Can LM2576 series parts (3A rating) directly replace LM2575S-12 (1A rating)?

A: Yes. LM2576 parts maintain identical output voltage (12V), switching frequency (52kHz), input voltage range (4V to 40V), operating temperature range (-40°C to 125°C), and package configuration (TO-263-6, D2PAK). The higher current rating (3A vs. 1A) provides design margin and does not create compatibility issues in circuits designed for 1A operation.

Q: What is the difference between packaging designations like "Tube," "Tape & Reel (TR)," and "Cut Tape (CT) & Digi-Reel®"?

A: These designations describe the physical packaging format for component delivery and automated assembly. Tube packaging is suitable for manual assembly or lower-volume production. Tape & Reel (TR) format is optimized for high-speed automated pick-and-place assembly. Cut Tape (CT) & Digi-Reel® provides flexibility for mixed-volume production. All formats contain electrically identical components; selection depends on manufacturing process requirements, not electrical performance.

Q: Are there input voltage differences between substitute parts that affect compatibility?

A: Most substitutes specify 4V minimum input voltage, matching the original LM2575S-12. LM2575D2T-12R4G and LM2576D2TR4-012G specify 4.75V and 7V minimum input voltages respectively. If your application operates below these thresholds, select substitutes with lower minimum input voltage specifications (4V minimum).

Q: Why is RoHS compliance status different between the original part and substitutes?

A: The original LM2575S-12 is RoHS non-compliant (obsolete product). Active substitute parts (LM2575S-12/NOPB, LM2575-12WU-TR, LM2575D2T-12R4G, LM2576 series) are ROHS3 compliant, reflecting current manufacturing standards and regulatory requirements. ROHS3 compliance is mandatory for new designs and production in regulated markets.

Q: Can I use LM2575S-12/NOPB as a drop-in replacement without circuit modifications?

A: Yes. LM2575S-12/NOPB is electrically and mechanically identical to LM2575S-12, differing only in product status (active vs. obsolete) and RoHS compliance. No circuit modifications are required.

Q: What does the "/NOPB" suffix in part numbers indicate?

A: The "/NOPB" suffix indicates "No Plumbum" (lead-free) manufacturing, reflecting RoHS compliance. This is a packaging and manufacturing designation; electrical performance is identical to equivalent parts without this suffix.

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