LM2575D2T-ADJ Equivalent & Substitute Parts

Part Overview

The LM2575D2T-ADJ is a buck switching regulator IC from onsemi, designed for positive adjustable output applications with 1A output current capacity. This part operates across a 4.75V to 40V input range with adjustable output from 1.23V to 37V, utilizing a 52kHz switching frequency in a TO-263-6 D2PAK package. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Function	Step-Down (Buck)
Output Configuration	Positive Adjustable
Number of Outputs	1
Voltage - Input (Min)	4.75V
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	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following electrical and mechanical parameters:

Critical Matching Parameters:

Function: Step-Down (Buck) topology
Output Configuration: Positive Adjustable
Output Type: Adjustable with 1.23V minimum
Package / Case: TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type: Surface Mount
Operating Temperature Range: -40°C ~ 125°C (TJ)

Allowable Variation Parameters:

Input Voltage Range: Minimum 4V to 4.75V acceptable; Maximum 40V or higher acceptable
Output Current: 1A or higher acceptable (higher current capability does not disqualify substitution)
Switching Frequency: 52kHz baseline; variations acceptable within functional design constraints
RoHS Status: Active parts with ROHS3 compliance preferred over obsolete non-compliant parts

Substitute parts are categorized as Direct Substitutes (identical electrical specifications and package) or Similar Substitutes (compatible electrical specifications with higher current ratings or extended input voltage ranges).

Parameter Comparison

Part Number	Manufacturer	Input Voltage (Min-Max)	Output Current	Switching Frequency	Package	Product Status	RoHS Status
LM2575D2T-ADJ	onsemi	4.75V - 40V	1A	52kHz	TO-263-6, D2PAK-5	Obsolete	Non-compliant
LM2575D2T-ADJG	onsemi	4.75V - 40V	1A	52kHz	TO-263-6, D2PAK-5	Active	ROHS3 Compliant
TL2575-ADJIKTTR	Texas Instruments	4.75V - 40V	1A	52kHz	TO-263-6, D2PAK-5	Active	ROHS3 Compliant
TL2575-ADJIKTTRG3	Texas Instruments	4.75V - 40V	1A	52kHz	TO-263-6, D2PAK-5	Active	ROHS3 Compliant
LM2575WU-TR	Microchip Technology	4V - 40V	1A	52kHz	TO-263-6, D2PAK-5	Active	ROHS3 Compliant
TL2575HV-ADJIKTTR	Texas Instruments	4.75V - 60V	1A	52kHz	TO-263-6, D2PAK-5	Active	ROHS3 Compliant
LM2576WU	Microchip Technology	4V - 40V	3A	52kHz	TO-263-6, D2PAK-5	Active	ROHS3 Compliant
LM2576WU-TR	Microchip Technology	4V - 40V	3A	52kHz	TO-263-6, D2PAK-5	Active	ROHS3 Compliant
AP1501-K5G-13	Diodes Incorporated	4.5V - 40V	3A	150kHz	TO-263-6, D2PAK-5	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Identical Specifications):

LM2575D2T-ADJG (onsemi) is the direct equivalent with identical electrical parameters and package configuration. This part transitions from the obsolete LM2575D2T-ADJ to an active product status with ROHS3 compliance, making it the primary replacement for existing designs.

TL2575-ADJIKTTR and TL2575-ADJIKTTRG3 (Texas Instruments) provide equivalent functionality with identical input/output voltage ranges, current rating, and switching frequency. Both are active products with ROHS3 compliance. The primary difference is packaging format: TL2575-ADJIKTTR is supplied in Cut Tape & Digi-Reel format, while TL2575-ADJIKTTRG3 is supplied in Tape & Reel format.

LM2575WU-TR (Microchip Technology) matches the 1A output current and 52kHz switching frequency with a slightly lower minimum input voltage (4V vs. 4.75V), providing enhanced flexibility for lower-voltage input applications while maintaining full compatibility with the original design envelope.

Similar Substitutes (Enhanced Specifications):

LM2576WU and LM2576WU-TR (Microchip Technology) offer 3A output current capacity with identical switching frequency and package, suitable for designs requiring higher current delivery without package redesign. These parts are available in Tube and Tape & Reel packaging options respectively.

TL2575HV-ADJIKTTR (Texas Instruments) extends the maximum input voltage to 60V while maintaining 1A output current and 52kHz switching frequency, enabling use in higher input voltage applications within the same package footprint.

AP1501-K5G-13 (Diodes Incorporated) provides 3A output current with a higher switching frequency of 150kHz, offering improved efficiency and reduced component size in filtering circuits. The minimum input voltage is 4.5V, and maximum output voltage is 37V, maintaining compatibility with the original design specifications.

All substitute parts listed are active products with ROHS3 compliance, addressing the regulatory limitations of the obsolete LM2575D2T-ADJ.

Frequently Asked Questions (FAQ)

Q: Can I use LM2576WU as a direct replacement for LM2575D2T-ADJ?

A: LM2576WU is a compatible substitute with enhanced 3A output current capability versus the original 1A rating. The identical 52kHz switching frequency, adjustable output configuration, and TO-263-6 D2PAK package ensure functional compatibility. The higher current rating does not create design conflicts; it simply provides additional headroom for the application.

Q: What is the difference between TL2575-ADJIKTTR and TL2575-ADJIKTTRG3?

A: Both parts are electrically identical with matching input/output voltage ranges, 1A current rating, and 52kHz switching frequency. The difference is packaging format: TL2575-ADJIKTTR is supplied in Cut Tape & Digi-Reel format, while TL2575-ADJIKTTRG3 is supplied in Tape & Reel format. Selection depends on assembly line equipment compatibility and volume requirements.

Q: Is TL2575HV-ADJIKTTR suitable for designs originally using LM2575D2T-ADJ?

A: Yes. TL2575HV-ADJIKTTR maintains the 1A output current, 52kHz switching frequency, and TO-263-6 D2PAK package. The extended maximum input voltage rating (60V vs. 40V) does not affect designs operating within the original 4.75V to 40V input range. This part is beneficial for applications requiring future input voltage expansion.

Q: Why does AP1501-K5G-13 have a different switching frequency?

A: AP1501-K5G-13 operates at 150kHz versus the standard 52kHz, enabling smaller external filter components and improved transient response. The higher frequency is compatible with the adjustable output topology and TO-263-6 package. Design verification of output filtering and EMI characteristics is necessary when transitioning to this higher frequency variant.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts carry ROHS3 compliance status. The original LM2575D2T-ADJ is RoHS non-compliant. Transition to any substitute part addresses regulatory compliance requirements for new production and long-term supply chain sustainability.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Tube, Cut Tape & Digi-Reel, and Tape & Reel. Selection depends on assembly process requirements and volume. All maintain the identical TO-263-6 D2PAK footprint for PCB compatibility.

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