MIC29303BU TR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MIC29303BU TR is a linear voltage regulator IC from Microchip Technology designed for positive adjustable output applications. This Surface Mount device delivers 3A output current with input voltage capability up to 26V and adjustable output voltage ranging from 1.25V to 25V. The regulator integrates protection features including over-current, over-temperature, reverse polarity, and transient voltage protection.

The MIC29303BU TR carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements for applications currently utilizing this component.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	26V
Voltage - Output (Min/Fixed)	1.25V
Voltage - Output (Max)	25V
Voltage Dropout (Max)	0.6V @ 3A
Current - Output	3A
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
Package / Case	TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Supplier Device Package	TO-263-5
Protection Features	Over Current, Over Temperature, Reverse Polarity, Transient Voltage

Substitute Part Grouping Explanation

Substitute parts for the MIC29303BU TR are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

Output Configuration: Positive
Output Type: Adjustable
Number of Regulators: 1
Voltage - Input (Max): 26V
Voltage - Output (Min/Fixed): 1.25V
Voltage - Output (Max): 25V
Voltage Dropout (Max): 0.6V @ 3A
Current - Output: 3A
Operating Temperature: -40°C ~ 125°C
Mounting Type: Surface Mount
Package / Case: TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
Supplier Device Package: TO-263-5
Protection Features: Over Current, Over Temperature, Reverse Polarity, Transient Voltage

The MIC29303WU TR meets all electrical and mechanical parameters specified for the MIC29303BU TR, establishing it as a parametric equivalent. Both devices share the same base product number (MIC29303) and are manufactured by Microchip Technology.

Parameter Comparison

Parameter	MIC29303BU TR	MIC29303WU TR	Match Status
Manufacturer	Microchip Technology	Microchip Technology	Match
Output Configuration	Positive	Positive	Match
Output Type	Adjustable	Adjustable	Match
Number of Regulators	1	1	Match
Voltage - Input (Max)	26V	26V	Match
Voltage - Output (Min/Fixed)	1.25V	1.25V	Match
Voltage - Output (Max)	25V	25V	Match
Voltage Dropout (Max)	0.6V @ 3A	0.6V @ 3A	Match
Current - Output	3A	3A	Match
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	Match
Mounting Type	Surface Mount	Surface Mount	Match
Package / Case	TO-263-6, D2PAK (5 Leads + Tab), TO-263BA	TO-263-6, D2PAK (5 Leads + Tab), TO-263BA	Match
Supplier Device Package	TO-263-5	TO-263-5	Match
Protection Features	Over Current, Over Temperature, Reverse Polarity, Transient Voltage	Over Current, Over Temperature, Reverse Polarity, Transient Voltage	Match
Product Status	Obsolete	Active	Difference
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Difference

Engineering Selection Recommendations

The MIC29303WU TR is the direct parametric equivalent for the MIC29303BU TR. All electrical specifications, output characteristics, protection features, and mechanical package parameters are identical between the two devices.

The primary distinction between these parts is product lifecycle status and regulatory compliance. The MIC29303BU TR is classified as Obsolete, while the MIC29303WU TR maintains Active product status with current manufacturing support. Additionally, the MIC29303WU TR achieves ROHS3 compliance, whereas the MIC29303BU TR is RoHS non-compliant.

For new designs or production continuity, the MIC29303WU TR is the appropriate selection. The device maintains full electrical and mechanical compatibility with existing circuit designs utilizing the MIC29303BU TR, requiring no schematic or layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the MIC29303WU TR be used as a direct replacement for the MIC29303BU TR?

A: Yes. The MIC29303WU TR is a parametric equivalent with identical electrical specifications, output characteristics, protection features, and TO-263-5 package configuration. No circuit modifications are required for substitution.

Q: What is the primary reason to substitute the MIC29303BU TR?

A: The MIC29303BU TR carries Obsolete product status, limiting long-term availability and manufacturing support. The MIC29303WU TR provides equivalent functionality with Active product status and current supply chain availability.

Q: Are there packaging differences between these parts?

A: Both devices use the TO-263-5 supplier device package (TO-263-6, D2PAK with 5 Leads + Tab). No PCB layout or footprint modifications are necessary for substitution.

Q: What is the difference in RoHS compliance?

A: The MIC29303BU TR is RoHS non-compliant. The MIC29303WU TR achieves ROHS3 compliance, meeting current environmental and regulatory requirements for electronic components in many jurisdictions.

Q: Are the output voltage ranges identical?

A: Yes. Both devices provide adjustable output voltage from 1.25V to 25V with identical dropout voltage specifications of 0.6V at 3A output current.

Q: Do both parts support the same operating temperature range?

A: Yes. Both the MIC29303BU TR and MIC29303WU TR operate across the -40°C to 125°C temperature range with identical protection features for over-current, over-temperature, reverse polarity, and transient voltage conditions.

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