LM2576BU TR Equivalent & Substitute Parts

Part Overview

The LM2576BU TR is a buck switching regulator IC manufactured by Microchip Technology, designed for positive adjustable output applications with 3A output current capability. This part operates in the 4V to 40V input range and delivers adjustable output from 1.23V to 37V. The LM2576BU TR is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and production continuity.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
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	3A
Frequency - Switching	52kHz
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Operating Temperature	-40°C ~ 125°C (TJ)
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the LM2576BU TR is determined by the following critical parameters:

Primary Substitution Criteria:

Output current capability: 3A minimum
Input voltage range: 4V to 40V minimum
Output voltage adjustability: 1.23V to 37V minimum
Package compatibility: TO-263-6, D2PAK (5 Leads + Tab)
Topology: Buck (step-down) configuration
Output configuration: Positive adjustable

Substitution Categories:

Direct Equivalents (3A Output, 52kHz Switching): Parts maintaining identical electrical specifications and switching frequency. LM2576WU TR qualifies as a direct equivalent with active product status and improved RoHS3 compliance.

Higher Performance Alternatives (3A Output, 150kHz Switching): Parts with increased switching frequency and enhanced specifications. AP1501-K5G-13 (Diodes Incorporated) and LM2596DSADJG, LM2596DSADJR4G (onsemi) provide 3A output with 150kHz operation, offering improved efficiency and reduced component size.

Lower Current Alternatives (1A Output, 52kHz Switching): Parts with reduced output current but compatible topology and package. LM2575S-ADJ/NOPB, LM2575SX-ADJ/NOPB, TL2575-ADJIKTTR, and TL2575-ADJIKTTRG3 are suitable for applications requiring 1A or less output current.

Extended Voltage Alternative (1A Output, 60V Maximum Input): TL2575HV-ADJIKTTR extends input voltage capability to 60V for specialized high-voltage applications, with 1A output current.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Current	Switching Frequency	Input Voltage (Min-Max)	Output Voltage (Min-Max)	Operating Temp	RoHS Status	Package
LM2576BU TR	Microchip Technology	Obsolete	3A	52kHz	4V - 40V	1.23V - 37V	-40°C ~ 125°C	RoHS non-compliant	TO-263-6
LM2576WU TR	Microchip Technology	Active	3A	52kHz	4V - 40V	1.23V - 37V	-40°C ~ 125°C	ROHS3 Compliant	TO-263-6
AP1501-K5G-13	Diodes Incorporated	Active	3A	150kHz	4.5V - 40V	1.23V - 37V	-20°C ~ 125°C	ROHS3 Compliant	TO-263-6
LM2575S-ADJ/NOPB	Texas Instruments	Active	1A	52kHz	4V - 40V	1.23V - 37V	-40°C ~ 125°C	ROHS3 Compliant	TO-263-6
LM2575SX-ADJ/NOPB	Texas Instruments	Active	1A	52kHz	4V - 40V	1.23V - 37V	-40°C ~ 125°C	ROHS3 Compliant	TO-263-6
TL2575-ADJIKTTR	Texas Instruments	Active	1A	52kHz	4.75V - 40V	1.23V - 37V	-40°C ~ 125°C	ROHS3 Compliant	TO-263-6
TL2575-ADJIKTTRG3	Texas Instruments	Active	1A	52kHz	4.75V - 40V	1.23V - 37V	-40°C ~ 125°C	ROHS3 Compliant	TO-263-6
TL2575HV-ADJIKTTR	Texas Instruments	Active	1A	52kHz	4.75V - 60V	1.23V - 57V	-40°C ~ 125°C	ROHS3 Compliant	TO-263-6
LM2596DSADJG	onsemi	Active	3A	150kHz	4.5V - 40V	1.23V - 37V	-40°C ~ 125°C	ROHS3 Compliant	TO-263-6
LM2596DSADJR4G	onsemi	Active	3A	150kHz	4.5V - 40V	1.23V - 37V	-40°C ~ 125°C	ROHS3 Compliant	TO-263-6

Engineering Selection Recommendations

For Direct Replacement (3A Output, 52kHz Operation): LM2576WU TR is the primary recommendation as a direct equivalent. It maintains identical electrical specifications and switching frequency while offering active product status and ROHS3 compliance, addressing the obsolescence of the original LM2576BU TR.

For Enhanced Performance (3A Output, 150kHz Operation): AP1501-K5G-13, LM2596DSADJG, and LM2596DSADJR4G provide 3A output capability with 150kHz switching frequency. These parts are suitable for applications where higher switching frequency reduces passive component size and improves transient response. All three maintain ROHS3 compliance and active product status. LM2596 variants offer multi-topology capability (buck, boost, buck-boost) for flexible circuit configurations.

For Current-Limited Applications (1A Output, 52kHz Operation): LM2575S-ADJ/NOPB, LM2575SX-ADJ/NOPB, TL2575-ADJIKTTR, and TL2575-ADJIKTTRG3 are applicable for designs requiring 1A or less output current. All maintain 52kHz switching frequency and ROHS3 compliance. Packaging differences (tube versus cut tape) affect supply chain logistics but do not impact electrical performance.

For Extended Voltage Applications (1A Output, 60V Maximum Input): TL2575HV-ADJIKTTR extends input voltage capability to 60V maximum, suitable for specialized high-voltage buck regulation applications with 1A output current requirement.

Compliance Considerations: All recommended substitutes are ROHS3 compliant, addressing regulatory requirements absent in the original LM2576BU TR. Moisture sensitivity levels (MSL 1 or MSL 3) are provided for assembly process planning.

Frequently Asked Questions (FAQ)

Q: Can LM2576WU TR directly replace LM2576BU TR in existing designs? A: Yes. LM2576WU TR maintains identical electrical specifications, switching frequency, output current, and package configuration. The primary differences are active product status and ROHS3 compliance. No circuit modifications are required.

Q: What is the difference between 52kHz and 150kHz switching frequency alternatives? A: Higher switching frequency (150kHz) reduces the size of output filter inductors and capacitors, improving power density and transient response. Lower frequency (52kHz) reduces switching losses and EMI generation. Selection depends on application requirements for component size versus efficiency.

Q: Can I use a 1A part (LM2575 series) instead of the 3A LM2576? A: Only if your application requires 1A or less output current. The LM2575 series is not suitable for applications requiring 3A output. Exceeding rated current causes thermal stress and potential device failure.

Q: What is the difference between LM2596DSADJG and LM2596DSADJR4G? A: Both parts are electrically identical with 3A output and 150kHz switching. The difference is packaging: LM2596DSADJG is supplied in tube packaging, while LM2596DSADJR4G is supplied in cut tape with Digi-Reel. Electrical performance is identical; selection is based on supply chain and assembly requirements.

Q: Are all substitute parts in the same package? A: Yes. All recommended substitutes use TO-263-6 (D2PAK with 5 leads plus tab) package, ensuring mechanical and electrical compatibility with existing PCB layouts.

Q: What does ROHS3 compliance mean for my application? A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. This is required for products sold in the European Union and many other markets. The original LM2576BU TR is non-compliant; all substitutes are ROHS3 compliant.

Q: Can LM2596 parts operate in boost or buck-boost configuration? A: Yes. LM2596 series supports buck, boost, and buck-boost topologies through external circuit configuration. However, for buck-only applications matching the LM2576 function, standard buck configuration is used. Consult device datasheets for topology-specific application circuits.

Q: What is the minimum input voltage for AP1501-K5G-13? A: AP1501-K5G-13 requires minimum 4.5V input, compared to 4V for LM2576BU TR. This 0.5V difference is negligible for most applications but must be verified for designs operating near the 4V minimum threshold.

Q: How does operating temperature range affect part selection? A: LM2576BU TR and most substitutes operate from -40°C to 125°C. AP1501-K5G-13 operates from -20°C to 125°C, limiting its use in applications requiring -40°C minimum operation. Verify temperature requirements before selection.

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