LM2576-5.0BU TR Equivalent & Substitute Parts

Part Overview

The LM2576-5.0BU TR is a buck switching regulator IC from Microchip Technology designed for step-down voltage conversion with a fixed 5V output and 3A output current capability. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device operates across an input voltage range of 4V to 40V with a switching frequency of 52kHz and is housed in a TO-263-6 (D2PAK) surface mount package.

Key Parameters

Parameter	Value
Function	Step-Down (Buck)
Output Configuration	Positive Fixed 5V
Number of Outputs	1
Voltage - Input (Min)	4V
Voltage - Input (Max)	40V
Voltage - Output	5V Fixed
Current - Output	3A
Frequency - Switching	52kHz
Synchronous Rectifier	No
Operating Temperature	-40°C to 125°C (TJ)
Package / Case	TO-263-6, D2PAK (5 Leads + Tab)
Mounting Type	Surface Mount
RoHS Status	RoHS Non-Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution for the LM2576-5.0BU TR is determined by the following critical parameters: fixed 5V output voltage, buck topology, positive output configuration, TO-263-6 package compatibility, surface mount capability, and operating temperature range of -40°C to 125°C. The substitute parts are grouped into two categories based on output current capability and input voltage range specifications.

Category 1: Direct Current Rating Match (3A Output) The LM2576-5.0WU-TR from Microchip Technology provides identical electrical specifications with 3A output current, matching the original part's performance envelope while offering active product status and RoHS3 compliance.

Category 2: Reduced Current Rating (1A Output) Texas Instruments LM2575 and LM2591 series devices provide 1A output current with the same 5V fixed output, TO-263-6 package, and operating temperature range. These parts are suitable for applications where the full 3A capacity is not required. The LM2591 series extends the maximum input voltage to 60V compared to the standard 40V specification.

Category 3: Automotive Grade Alternative The TL2575HV-05QKTTRQ1 provides automotive qualification (AEC-Q100) with extended input voltage range (60V maximum) and 1A output current, suitable for automotive applications requiring equivalent functionality.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Min/Max)	Switching Frequency	Product Status	RoHS Status	Package
LM2576-5.0BU TR	Microchip Technology	3A	4V / 40V	52kHz	Obsolete	Non-Compliant	TO-263-6
LM2576-5.0WU-TR	Microchip Technology	3A	4V / 40V	52kHz	Active	RoHS3 Compliant	TO-263-6
LM2575S-5.0/NOPB	Texas Instruments	1A	4V / 40V	52kHz	Active	RoHS3 Compliant	TO-263-6
LM2575SX-5.0/NOPB	Texas Instruments	1A	4V / 40V	52kHz	Active	RoHS3 Compliant	TO-263-6
LM2591HVS-5.0/NOPB	Texas Instruments	1A	4.5V / 60V	150kHz	Active	RoHS3 Compliant	TO-263-6
LM2591HVSX-5.0/NOPB	Texas Instruments	1A	4.5V / 60V	150kHz	Active	RoHS3 Compliant	TO-263-6
TL2575-05IKTTR	Texas Instruments	1A	4.75V / 40V	52kHz	Active	RoHS3 Compliant	TO-263-6
TL2575-05IKTTRG3	Texas Instruments	1A	4.75V / 40V	52kHz	Active	RoHS3 Compliant	TO-263-6
TL2575HV-05IKTTR	Texas Instruments	1A	4.75V / 60V	52kHz	Active	RoHS3 Compliant	TO-263-6
TL2575HV-05QKTTRQ1	Texas Instruments	1A	4.75V / 60V	52kHz	Active	RoHS3 Compliant	TO-263-6

Engineering Selection Recommendations

Primary Substitute: LM2576-5.0WU-TR This Microchip Technology part is the direct functional equivalent with identical 3A output current and 52kHz switching frequency. It maintains the same input voltage range (4V to 40V) and TO-263-6 package footprint. The LM2576-5.0WU-TR is active in production and RoHS3 compliant, making it the preferred choice for new designs requiring full current capacity and regulatory compliance.

Alternative for Reduced Current Applications: LM2575 Series When 1A output current is sufficient, the LM2575S-5.0/NOPB and LM2575SX-5.0/NOPB from Texas Instruments provide active product status with RoHS3 compliance. Both maintain the 52kHz switching frequency and 4V to 40V input range. The primary difference is packaging format (Tube versus Cut Tape & Digi-Reel).

Extended Input Voltage Option: LM2591 Series The LM2591HVS-5.0/NOPB and LM2591HVSX-5.0/NOPB extend maximum input voltage to 60V with a higher switching frequency of 150kHz. These are suitable for applications requiring higher input voltage tolerance while accepting 1A output current limitation. Both are RoHS3 compliant and active in production.

Automotive Grade Option: TL2575HV-05QKTTRQ1 For automotive applications, the TL2575HV-05QKTTRQ1 provides AEC-Q100 qualification with extended input voltage range (4.75V to 60V) and 1A output current. This part is active and RoHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can I use a 1A rated substitute in place of the 3A LM2576-5.0BU TR? A: Only if your application's maximum output current requirement does not exceed 1A. The LM2575 and LM2591 series devices are rated for 1A maximum output current. Exceeding this rating will cause thermal shutdown and circuit malfunction. If your design requires the full 3A capacity, use the LM2576-5.0WU-TR.

Q: What is the difference between LM2575 and LM2591 series? A: The LM2591 series supports higher maximum input voltage (60V versus 40V) and operates at a higher switching frequency (150kHz versus 52kHz). Both provide 1A output current and 5V fixed output. Select LM2591 if your input voltage may exceed 40V; otherwise, LM2575 is suitable.

Q: Are all substitute parts pin-compatible with the original LM2576-5.0BU TR? A: All listed substitutes use the TO-263-6 (D2PAK) package with identical pinout. Pin compatibility is maintained across all alternatives.

Q: What does RoHS3 compliance mean for my application? A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, restricting lead and other hazardous materials. The original LM2576-5.0BU TR is RoHS non-compliant. If your application requires RoHS compliance, select from the active substitute parts, all of which are RoHS3 compliant.

Q: Can I use TL2575HV-05QKTTRQ1 in non-automotive applications? A: Yes. The TL2575HV-05QKTTRQ1 is AEC-Q100 qualified for automotive use but can be used in general industrial and commercial applications. It provides the same electrical functionality as other TL2575HV variants with automotive-grade reliability.

Q: What is the difference between Cut Tape and Tape & Reel packaging? A: Both are surface mount packaging formats. Tape & Reel (TR) is supplied on continuous tape for automated assembly equipment. Cut Tape (CT) & Digi-Reel is supplied in smaller quantities on tape. Electrical specifications are identical; packaging choice depends on production volume and assembly equipment compatibility.

Q: Why does the LM2591 have a higher switching frequency than LM2575? A: The LM2591 operates at 150kHz versus 52kHz for LM2575. Higher switching frequency allows for smaller external filter components but may increase switching losses. Both frequencies are suitable for 5V buck regulation; component selection depends on your specific design requirements.

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