LM2575BU TR Buck Switching Regulator IC - Equivalent & Substitute Parts

Part Overview

The LM2575BU TR is a buck switching regulator IC manufactured by Microchip Technology, designed for positive adjustable output applications with 1A output current capability. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and ongoing production requirements. The LM2575BU TR operates across a 4V to 40V input range with adjustable output from 1.23V to 37V, making it suitable for various power management applications requiring step-down voltage conversion.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Part Number	LM2575BU TR
Product Status	Obsolete
Function	Step-Down (Buck)
Output Configuration	Positive
Output Type	Adjustable
Voltage - Input (Min)	4V
Voltage - Input (Max)	40V
Voltage - Output (Min/Fixed)	1.23V
Voltage - Output (Max)	37V
Current - Output	1A
Frequency - Switching	52kHz
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature	-40°C ~ 125°C (TJ)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the LM2575BU TR is determined by the following critical parameters:

Primary Substitution Criteria:

Function: Step-Down (Buck) topology
Output Configuration: Positive adjustable output
Package / Case: TO-263-6, D2PAK (5 Leads + Tab) mechanical compatibility
Voltage Range: Input 4V minimum to 40V maximum; Output adjustable from 1.23V to 37V
Current Rating: Output current capability of 1A or greater
Operating Temperature: -40°C to 125°C (TJ)

Substitute Categories:

Direct Functional Equivalents (1A Output Current): Parts maintaining identical switching frequency (52kHz), 1A output current, and buck topology with positive adjustable output.

Enhanced Capability Substitutes (Higher Output Current): Parts with superior output current ratings (3A) while maintaining compatible voltage ranges, adjustable output configuration, and package compatibility. These provide design margin and thermal performance improvements.

Cross-Manufacturer Alternatives: Active production equivalents from alternative manufacturers (Texas Instruments, onsemi) offering identical or enhanced electrical specifications with improved compliance status.

Parameter Comparison

Parameter	LM2575BU TR	LM2575WU-TR	LM2596DSADJR4G	TL2575-ADJIKTTR	TL2575-ADJIKTTRG3
Manufacturer	Microchip Technology	Microchip Technology	onsemi	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active
Function	Step-Down	Step-Down	Step-Up, Step-Down, Step-Up/Step-Down	Step-Down	Step-Down
Output Configuration	Positive	Positive	Positive or Negative	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable	Adjustable	Adjustable
Voltage - Input (Min)	4V	4V	4.5V	4.75V	4.75V
Voltage - Input (Max)	40V	40V	40V	40V	40V
Voltage - Output (Min/Fixed)	1.23V	1.23V	1.23V	1.23V	1.23V
Voltage - Output (Max)	37V	37V	37V	37V	37V
Current - Output	1A	1A	3A	1A	1A
Frequency - Switching	52kHz	52kHz	150kHz	52kHz	52kHz
Package / Case	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK	TO-263-6, D2PAK
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

LM2575WU-TR (Microchip Technology): Direct functional equivalent with identical electrical specifications and package compatibility. Preferred for applications requiring minimal design changes from the obsolete LM2575BU TR. Offers ROHS3 compliance and active production status. Suitable for drop-in replacement in existing designs.

TL2575-ADJIKTTR and TL2575-ADJIKTTRG3 (Texas Instruments): Cross-manufacturer equivalents maintaining identical 1A output current, 52kHz switching frequency, and adjustable positive output configuration. Both parts are in active production with ROHS3 compliance. Minimum input voltage specification of 4.75V (versus 4V for LM2575BU TR) requires verification for applications operating below this threshold. TL2575-ADJIKTTRG3 offers higher inventory availability (5100 pcs) compared to TL2575-ADJIKTTR (1364 pcs).

LM2596DSADJR4G (onsemi): Enhanced capability substitute with 3A output current rating, providing increased design margin and thermal performance. Supports multiple topologies (buck, boost, buck-boost) with positive or negative output configuration. Switching frequency of 150kHz enables smaller external component sizing. Moisture sensitivity level MSL 1 (unlimited) provides superior handling characteristics. Minimum input voltage of 4.5V requires verification for sub-4.5V applications. Recommended for new designs requiring higher current capacity or improved thermal performance.

Compliance Considerations: All substitute parts except LM2575BU TR are ROHS3 compliant. Applications subject to RoHS regulations require migration to compliant alternatives. The LM2596DSADJR4G offers superior moisture sensitivity rating (MSL 1 versus MSL 3), beneficial for extended storage and humid environment applications.

Frequently Asked Questions (FAQ)

Q: Can LM2575WU-TR directly replace LM2575BU TR without circuit modifications?

A: Yes. LM2575WU-TR maintains identical electrical specifications, output current rating (1A), switching frequency (52kHz), voltage ranges (4V to 40V input, 1.23V to 37V adjustable output), and TO-263-6 D2PAK package configuration. No circuit modifications are required for functional equivalence.

Q: What is the primary difference between LM2575WU-TR and LM2596DSADJR4G?

A: LM2575WU-TR provides 1A output current with buck-only topology, while LM2596DSADJR4G offers 3A output current with multi-topology capability (buck, boost, buck-boost). The LM2596DSADJR4G operates at 150kHz switching frequency versus 52kHz for LM2575WU-TR, enabling smaller external component sizing. Both maintain compatible voltage ranges and adjustable output configuration.

Q: Are there input voltage differences between substitute parts?

A: Yes. LM2575BU TR and LM2575WU-TR specify 4V minimum input voltage. TL2575-ADJIKTTR and TL2575-ADJIKTTRG3 specify 4.75V minimum input voltage. LM2596DSADJR4G specifies 4.5V minimum input voltage. Applications operating below 4.5V require LM2575WU-TR or LM2575BU TR.

Q: Is the TO-263-6 D2PAK package identical across all substitute parts?

A: Yes. All substitute parts utilize TO-263-6, D2PAK (5 Leads + Tab) package configuration, ensuring mechanical and thermal interface compatibility. PCB layout modifications are not required for package compatibility.

Q: Which substitute part offers the best compliance status?

A: All substitute parts (LM2575WU-TR, TL2575-ADJIKTTR, TL2575-ADJIKTTRG3, LM2596DSADJR4G) are ROHS3 compliant and in active production status. LM2596DSADJR4G additionally offers MSL 1 (unlimited moisture sensitivity) versus MSL 3 for other alternatives, providing superior handling and storage characteristics.

Q: Can LM2596DSADJR4G be used in applications designed for 1A output current?

A: Yes. LM2596DSADJR4G with 3A output current rating is suitable for applications designed for 1A output current. The higher current capability provides design margin and improved thermal performance. Circuit design remains compatible with the 1A specification.

Q: What switching frequency considerations apply when selecting substitutes?

A: LM2575WU-TR, TL2575-ADJIKTTR, and TL2575-ADJIKTTRG3 maintain 52kHz switching frequency identical to LM2575BU TR, ensuring compatible external component sizing and EMI characteristics. LM2596DSADJR4G operates at 150kHz, enabling smaller inductor and capacitor values but requiring verification of EMI performance in noise-sensitive applications.

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