LM2575D2T-012G Equivalent & Substitute Parts

Part Overview

The LM2575D2T-012G is a buck switching regulator IC manufactured by onsemi, designed for positive fixed 12V output applications with 1A current capacity. This device operates as a step-down converter with a fixed output topology, housed in a TO-263-6 D2PAK package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts maintain the same electrical specifications and package footprint while offering active product status and improved availability.

Key Parameters

Parameter	Value
Function	Step-Down (Buck)
Output Configuration	Positive Fixed
Output Voltage	12V
Output Current	1A
Input Voltage Range	4.75V to 40V
Switching Frequency	52kHz
Package Type	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature	-40°C to 125°C (TJ)
Mounting Type	Surface Mount
Synchronous Rectifier	No

Substitute Part Grouping Explanation

Substitution for the LM2575D2T-012G is determined by strict alignment of the following critical parameters:

Output voltage: 12V fixed
Package footprint: TO-263-6 D2PAK (5 Leads + Tab)
Input voltage range: minimum 4.75V, maximum 40V
Switching frequency: 52kHz
Output current capability: 1A minimum
Operating temperature range: -40°C to 125°C
Topology: Buck (step-down)
Output configuration: Positive fixed

Parts are grouped into two categories: direct equivalents (identical specifications and 1A output) and higher-capacity alternatives (3A or 5A output, suitable for designs with margin requirements). All substitute parts maintain the same package footprint and electrical interface compatibility.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Min/Max)	Switching Frequency	Operating Temperature	Product Status	Package
LM2575D2T-012G	onsemi	1A	4.75V / 40V	52kHz	-40°C to 125°C	Obsolete	TO-263-6 D2PAK-5
LM2575D2T-12R4G	onsemi	1A	4.75V / 40V	52kHz	-40°C to 125°C	Active	TO-263-6 D2PAK-5
TL2575-12IKTTR	Texas Instruments	1A	4.75V / 40V	52kHz	-40°C to 125°C	Active	TO-263-6 D2PAK-5
LM2575-12WU-TR	Microchip Technology	1A	4V / 40V	52kHz	-40°C to 125°C	Active	TO-263-6 D2PAK-5
TL2575HV-12IKTTR	Texas Instruments	1A	4.75V / 60V	52kHz	-40°C to 125°C	Active	TO-263-6 D2PAK-5
AP1501A-12K5G-13	Diodes Incorporated	5A	4.5V / 40V	150kHz	-20°C to 85°C	Active	TO-263-6 D2PAK-5
LM2576-12WU-TR	Microchip Technology	3A	4V / 40V	52kHz	-40°C to 125°C	Active	TO-263-6 D2PAK-5
LM2596S-12/NOPB	Texas Instruments	3A	4.5V / 40V	150kHz	-40°C to 125°C	Active	TO-263-6 D2PAK-5
LM2596SX-12/NOPB	Texas Instruments	3A	4.5V / 40V	150kHz	-40°C to 125°C	Active	TO-263-6 D2PAK-5

Engineering Selection Recommendations

For direct replacement of the obsolete LM2575D2T-012G, select from the 1A output devices with matching 52kHz switching frequency and -40°C to 125°C operating range:

LM2575D2T-12R4G (onsemi): Active product status, identical specifications, same manufacturer as original part
TL2575-12IKTTR (Texas Instruments): Active product status, ROHS3 compliant, established supply chain
LM2575-12WU-TR (Microchip Technology): Active product status, ROHS3 compliant, extended minimum input voltage tolerance (4V)
TL2575HV-12IKTTR (Texas Instruments): Active product status, extended maximum input voltage (60V) for higher input range applications

For applications requiring increased current capacity or design margin, higher-output alternatives are available:

LM2576-12WU-TR (Microchip Technology): 3A output, maintains 52kHz switching frequency and full temperature range
LM2596S-12/NOPB or LM2596SX-12/NOPB (Texas Instruments): 3A output, higher switching frequency (150kHz), ROHS3 compliant

The AP1501A-12K5G-13 (Diodes Incorporated) offers 5A output capacity but operates at reduced temperature range (-20°C to 85°C) and higher switching frequency (150kHz), suitable only for applications within these constraints.

All recommended substitutes maintain TO-263-6 D2PAK package compatibility and positive fixed 12V output configuration.

Frequently Asked Questions (FAQ)

Q: Can I use a 3A or 5A rated part as a direct replacement for the 1A LM2575D2T-012G?

A: Yes. Higher current-rated devices (LM2576 series at 3A, AP1501A at 5A) are electrically compatible and will function in circuits designed for 1A operation. The higher current rating provides design margin and does not create compatibility issues. Package footprint remains identical (TO-263-6 D2PAK).

Q: What is the difference between the 52kHz and 150kHz switching frequency parts?

A: The LM2575/TL2575 family operates at 52kHz, while the LM2596 family operates at 150kHz. Higher switching frequency allows for smaller external filter components but may introduce different EMI characteristics. Select based on your circuit design requirements and PCB layout constraints.

Q: Are all substitute parts ROHS3 compliant?

A: Most active substitutes carry ROHS3 compliance certification. Verify specific part datasheets for compliance documentation if required for your application.

Q: What is the significance of the input voltage range differences?

A: The LM2575-12WU-TR accepts input as low as 4V (versus 4.75V standard), while TL2575HV-12IKTTR accepts input up to 60V (versus 40V standard). Select based on your specific input voltage requirements. Standard 4.75V to 40V range covers most industrial and consumer applications.

Q: Can I interchange parts with different packaging designations (CT, TR, Tube)?

A: Packaging designations (Cut Tape, Tape & Reel, Tube) refer to supply format only and do not affect electrical performance or PCB compatibility. All parts in the same package type (TO-263-6 D2PAK) are mechanically and electrically interchangeable.

Q: Why is the AP1501A-12K5G-13 listed separately despite higher current rating?

A: The AP1501A operates at -20°C to 85°C temperature range (versus -40°C to 125°C for other parts) and 150kHz switching frequency. Use only in applications where these specifications are acceptable.

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