MIC29503BU TR Equivalent & Substitute Parts

Part Overview

The MIC29503BU TR is a linear voltage regulator IC from Microchip Technology designed for positive adjustable output applications. It delivers 5A output current with an input voltage range up to 26V and adjustable output voltage from 1.25V to 25V. The device is housed in a TO-263-5 surface mount package and includes integrated protection features for over-current, over-temperature, reverse polarity, and transient voltage conditions.

The MIC29503BU TR is classified as obsolete. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications currently utilizing this regulator.

Substiute Parts

MIC29503BU TR

Microchip TechnologyIn Stock: 1147MIC29503BU TR Datasheet

Current PartRFQ

MIC29503WU-TR

Microchip TechnologyIn Stock: 1033MIC29503WU-TR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MIC29503BU TR are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters:

• Output configuration: Positive
• Output type: Adjustable
• Number of regulators: 1
• Maximum input voltage: 26V
• Output voltage range: 1.25V to 25V minimum, 25V maximum
• Output current: 5A
• Maximum dropout voltage: 0.6V @ 5A
• Operating temperature range: -40°C to 125°C
• Protection features: Over Current, Over Temperature, Reverse Polarity, Transient Voltage

Mechanical Parameters:

• Package type: TO-263-5 (Supplier Device Package)
• Mounting type: Surface Mount
• Physical case: TO-263-6, D2PAK (5 Leads + Tab), TO-263BA

Substitute parts must match all electrical parameters and maintain mechanical compatibility with the original package specification.

Parameter Comparison

Engineering Selection Recommendations

The MIC29503WU-TR is a direct electrical and mechanical equivalent to the MIC29503BU TR. Both devices share identical electrical specifications across all critical parameters: output configuration, voltage ranges, current capacity, dropout voltage, operating temperature, and protection features. Both are housed in the same TO-263-5 package with identical pin configuration and mounting requirements.

The primary distinction between the two parts is product lifecycle status and regulatory compliance. The MIC29503BU TR is obsolete, while the MIC29503WU-TR maintains active product status from Microchip Technology. Additionally, the MIC29503WU-TR is ROHS3 compliant, whereas the MIC29503BU TR is RoHS non-compliant. Both devices maintain identical moisture sensitivity levels and REACH status.

For new designs or ongoing production requiring this regulator topology, the MIC29503WU-TR is the appropriate selection due to its active status and regulatory compliance posture.

Frequently Asked Questions (FAQ)

Q: Are the MIC29503BU TR and MIC29503WU-TR pin-compatible?

A: Yes. Both devices use the TO-263-5 package with identical pin configuration. The physical layout, lead spacing, and mounting footprint are equivalent, allowing direct PCB-level substitution without layout modifications.

Q: What is the difference between the MIC29503BU TR and MIC29503WU-TR?

A: The devices are electrically identical across all functional parameters. The primary differences are product status (obsolete versus active) and RoHS compliance (non-compliant versus ROHS3 compliant). The MIC29503WU-TR is the current production equivalent.

Q: Can the MIC29503WU-TR be used as a direct replacement in existing applications?

A: Yes. The MIC29503WU-TR meets or exceeds all electrical and mechanical specifications of the MIC29503BU TR. No circuit modifications, firmware changes, or design alterations are required for substitution.

Q: Are there any thermal or performance differences between these parts?

A: No. Both devices share identical thermal characteristics, dropout voltage specifications, output current ratings, and protection feature implementations. Performance in thermal management and load regulation is equivalent.

Q: What is the significance of the RoHS compliance difference?

A: The MIC29503WU-TR is ROHS3 compliant, meeting current regulatory requirements for hazardous substance restrictions in electronic components. The MIC29503BU TR, being obsolete, does not carry this certification. For applications subject to RoHS regulations, the MIC29503WU-TR is the appropriate selection.

Q: Is the moisture sensitivity level the same for both parts?

A: Yes. Both the MIC29503BU TR and MIC29503WU-TR are classified as MSL 3 (168 Hours), requiring identical handling, storage, and reflow procedures during assembly.