MIC4576-5.0BU TR Equivalent & Substitute Parts

Part Overview

The MIC4576-5.0BU TR is a buck switching regulator IC manufactured by Microchip Technology, delivering a fixed 5V output at 3A with input voltage range of 4V to 36V. This component operates at 200kHz switching frequency in a TO-263-6 (D2PAK) surface mount package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain functional compatibility across input/output voltage specifications, current capacity, package form factor, and thermal operating range.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Part Number	MIC4576-5.0BU TR
Function	Step-Down (Buck)
Output Voltage	5V Fixed
Output Current	3A
Input Voltage Range	4V to 36V
Switching Frequency	200kHz
Package	TO-263-6 (D2PAK, 5 Leads + Tab)
Operating Temperature	-40°C to 85°C
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitute parts are categorized based on compatibility with the MIC4576-5.0BU TR across the following critical parameters:

Direct Equivalent (Same Manufacturer, Same Specifications):

MIC4576-5.0WU-TR: Microchip Technology variant with identical electrical specifications (5V, 3A, 4V-36V input, 200kHz). Primary difference is active product status and RoHS3 compliance. Package and thermal range identical.

Functional Equivalents (Different Manufacturer, Compatible Specifications): Substitute parts from Texas Instruments are grouped by output current capacity:

3A Output Current Group: LM2596S-5.0/NOPB and LM2596SX-5.0/NOPB match the 3A output requirement with 5V fixed output, TO-263-6 package, and -40°C to 125°C operating range. Input voltage range is 4.5V to 40V (slightly narrower than original). Switching frequency is 150kHz.
1A Output Current Group: LM2575S-5.0/NOPB, LM2575SX-5.0/NOPB, LM2591HVS-5.0/NOPB, LM2591HVSX-5.0/NOPB, LM2595S-5.0/NOPB, LM2595SX-5.0/NOPB, and TL2575-05IKTTR provide 1A output current. These are suitable only for applications where 1A output is sufficient. Input voltage ranges vary: LM2575/TL2575 support 4V-40V; LM2591 supports 4.5V-60V; LM2595 supports 4.5V-40V.

All substitute parts maintain the same package form factor (TO-263-6), surface mount technology, and fixed 5V output voltage. All active substitutes are RoHS3 compliant.

Parameter Comparison

Parameter	MIC4576-5.0BU TR	MIC4576-5.0WU-TR	LM2596S-5.0/NOPB	LM2596SX-5.0/NOPB	LM2575S-5.0/NOPB	LM2575SX-5.0/NOPB	LM2591HVS-5.0/NOPB	LM2591HVSX-5.0/NOPB	LM2595S-5.0/NOPB	LM2595SX-5.0/NOPB	TL2575-05IKTTR
Manufacturer	Microchip	Microchip	TI	TI	TI	TI	TI	TI	TI	TI	TI
Output Voltage	5V	5V	5V	5V	5V	5V	5V	5V	5V	5V	5V
Output Current	3A	3A	3A	3A	1A	1A	1A	1A	1A	1A	1A
Input Voltage (Min)	4V	4V	4.5V	4.5V	4V	4V	4.5V	4.5V	4.5V	4.5V	4.75V
Input Voltage (Max)	36V	36V	40V	40V	40V	40V	60V	60V	40V	40V	40V
Switching Frequency	200kHz	200kHz	150kHz	150kHz	52kHz	52kHz	150kHz	150kHz	150kHz	150kHz	52kHz
Package	TO-263-6	TO-263-6	TO-263-6	TO-263-6	TO-263-6	TO-263-6	TO-263-6	TO-263-6	TO-263-6	TO-263-6	TO-263-6
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS Affected	RoHS3 Compliant
Moisture Sensitivity (MSL)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

For Direct Replacement (Preferred): MIC4576-5.0WU-TR is the primary substitute. It maintains identical electrical specifications, package form factor, and thermal operating range as the obsolete MIC4576-5.0BU TR. The part is currently active with RoHS3 compliance, making it suitable for new designs and production continuity without circuit redesign.

For 3A Output Requirement (Texas Instruments): LM2596S-5.0/NOPB or LM2596SX-5.0/NOPB are suitable when 3A output current is required. Both parts deliver 5V fixed output in the same TO-263-6 package. The LM2596SX-5.0/NOPB variant offers higher inventory availability (43,100 units) in Cut Tape & Digi-Reel packaging. Input voltage range is 4.5V to 40V (slightly narrower than the original 4V minimum). Operating temperature extends to 125°C, providing improved thermal margin. Switching frequency is 150kHz versus the original 200kHz.

For 1A Output Requirement (Texas Instruments): When application current requirements are 1A or less, multiple options exist:

LM2575S-5.0/NOPB or LM2575SX-5.0/NOPB: 52kHz switching frequency, 4V-40V input range
LM2591HVS-5.0/NOPB or LM2591HVSX-5.0/NOPB: 150kHz switching frequency, 4.5V-60V input range (highest input voltage support)
LM2595S-5.0/NOPB or LM2595SX-5.0/NOPB: 150kHz switching frequency, 4.5V-40V input range

All active substitutes are RoHS3 compliant and rated to -40°C to 125°C. Packaging variants (Tube vs. Cut Tape & Digi-Reel) do not affect electrical performance.

Frequently Asked Questions (FAQ)

Q: Can I use a 1A part as a substitute for the 3A MIC4576-5.0BU TR? A: No. The MIC4576-5.0BU TR is rated for 3A output current. Substituting a 1A-rated part (such as LM2575, LM2591, or LM2595 series) will result in thermal stress and potential component failure if the application draws more than 1A. Use only 3A-rated substitutes (MIC4576-5.0WU-TR or LM2596 series) for this application.

Q: What is the difference between LM2596S-5.0/NOPB and LM2596SX-5.0/NOPB? A: Both parts have identical electrical specifications and package form factor. The primary difference is packaging: LM2596S-5.0/NOPB is supplied in Tube packaging, while LM2596SX-5.0/NOPB is supplied in Cut Tape & Digi-Reel format. The LM2596SX variant has significantly higher inventory availability (43,100 units vs. 8,999 units). Selection depends on procurement and assembly requirements.

Q: Is the input voltage range difference between the original part and substitutes significant? A: The MIC4576-5.0BU TR supports 4V minimum input, while most Texas Instruments substitutes require 4.5V minimum. If your application operates below 4.5V input, use MIC4576-5.0WU-TR (maintains 4V minimum) or LM2575S-5.0/NOPB and LM2575SX-5.0/NOPB (also support 4V minimum). The LM2591 series supports up to 60V input, providing extended high-voltage capability if needed.

Q: Does switching frequency affect circuit design? A: Yes. The original MIC4576-5.0BU TR operates at 200kHz, while most substitutes operate at 52kHz to 150kHz. Lower switching frequency may require larger output filter components (inductor and capacitor). If the original design uses frequency-dependent filtering, verify that substitute parts with different switching frequencies maintain acceptable output ripple and transient response. Consult the datasheet for each substitute part to confirm filter component compatibility.

Q: Are all substitute parts RoHS compliant? A: MIC4576-5.0WU-TR, LM2596S-5.0/NOPB, LM2596SX-5.0/NOPB, LM2575S-5.0/NOPB, LM2575SX-5.0/NOPB, LM2591HVS-5.0/NOPB, LM2591HVSX-5.0/NOPB, LM2595S-5.0/NOPB, and TL2575-05IKTTR are RoHS3 compliant. LM2595SX-5.0/NOPB is marked as RoHS Affected. The original MIC4576-5.0BU TR is RoHS non-compliant. For applications requiring RoHS compliance, use only parts explicitly marked as RoHS3 compliant.

Q: Can I use these parts interchangeably in existing PCB designs? A: All substitute parts use the same TO-263-6 (D2PAK) package with identical pin configuration and lead spacing. PCB footprints are compatible. However, verify that external component values (input/output capacitors, inductor, feedback resistors) are appropriate for the substitute part's switching frequency and electrical characteristics. Consult each substitute part's datasheet for recommended external component values.

Q: What is the operating temperature difference, and does it matter? A: The original MIC4576-5.0BU TR is rated -40°C to 85°C, while all active substitutes are rated -40°C to 125°C. The extended upper temperature rating of substitutes provides improved thermal margin and reliability in high-temperature environments. This is a beneficial characteristic and does not create compatibility issues.

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