MIC39300-2.5BU TR Equivalent & Substitute Parts

Part Overview

The MIC39300-2.5BU TR is a linear voltage regulator IC from Microchip Technology designed for positive fixed output applications. This Surface Mount device delivers 3A output current at a fixed 2.5V output voltage with a maximum input voltage of 16V and dropout voltage of 0.55V at full load. The part is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical performance specifications and mechanical compatibility within the TO-263-3 package footprint.

Substiute Parts

MIC39300-2.5BU TR

Microchip TechnologyIn Stock: 4160MIC39300-2.5BU TR Datasheet

Current PartRFQ

MIC39300-2.5WU-TR

Microchip TechnologyIn Stock: 7074MIC39300-2.5WU-TR Datasheet

Parametric EquivalentRFQ

SPX29300T-L-2-5/TR

MaxLinear, Inc.In Stock: 5497SPX29300T-L-2-5/TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MIC39300-2.5BU TR is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Output voltage: 2.5V fixed
• Maximum output current: 3A minimum
• Maximum input voltage: 16V or greater
• Operating temperature range: -40°C to 125°C minimum
• Package type: TO-263-3 (D2PAK with 3 leads plus tab)

Mechanical Compatibility:

• Surface Mount technology
• Identical footprint and lead configuration
• Tape & Reel packaging format

Functional Requirements:

• Positive output configuration
• Fixed output type
• Protection against over current and reverse polarity conditions

Parts meeting all criteria above are classified as parametric equivalents. Parts exceeding specified parameters while maintaining compatibility are classified as functional substitutes.

Parameter Comparison

Engineering Selection Recommendations

MIC39300-2.5WU-TR is the primary substitute for the obsolete MIC39300-2.5BU TR. Both parts are manufactured by Microchip Technology and provide identical electrical specifications. The MIC39300-2.5WU-TR is currently in active production status with higher inventory availability (7050 units in stock versus 4140 units for the obsolete variant). This part achieves ROHS3 compliance, addressing regulatory requirements for new designs. Dropout voltage performance is equivalent at 0.55V @ 3A. Direct pin-for-pin and footprint compatibility is maintained within the TO-263-3 package.

SPX29300T-L-2-5/TR is a manufacturer-recommended alternative from MaxLinear, Inc., suitable for applications where cross-manufacturer sourcing is acceptable. This part maintains electrical equivalence across output voltage, current rating, input voltage range, and operating temperature specifications. The dropout voltage specification of 0.8V @ 3A represents a 0.25V increase compared to the primary substitute but remains within acceptable limits for most applications. This part includes transient voltage protection in addition to standard over current and reverse polarity protection. RoHS compliance is confirmed. Active production status ensures long-term availability.

Selection between MIC39300-2.5WU-TR and SPX29300T-L-2-5/TR depends on supply chain strategy, manufacturer preference, and dropout voltage sensitivity in the target application. Both parts satisfy the core electrical and mechanical requirements for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can the MIC39300-2.5WU-TR directly replace the obsolete MIC39300-2.5BU TR?

A: Yes. The MIC39300-2.5WU-TR provides identical electrical specifications and mechanical compatibility. Both parts deliver 3A at 2.5V fixed output with 0.55V dropout voltage, operate across -40°C to 125°C, and use the TO-263-3 package. Pin configuration and footprint are equivalent, enabling direct substitution without circuit redesign.

Q: What is the difference in dropout voltage between the substitute parts?

A: The MIC39300-2.5WU-TR maintains the original 0.55V dropout voltage @ 3A. The SPX29300T-L-2-5/TR specifies 0.8V dropout voltage @ 3A, representing a 0.25V increase. Applications with tight input voltage margins or high current draw conditions should evaluate this difference against system requirements.

Q: Are both substitute parts RoHS compliant?

A: Yes. The MIC39300-2.5WU-TR achieves ROHS3 compliance. The SPX29300T-L-2-5/TR is RoHS compliant. The original MIC39300-2.5BU TR is non-compliant. New designs should specify one of the compliant alternatives.

Q: Do the substitute parts require different PCB footprints?

A: No. All three parts use the TO-263-3 package (D2PAK with 3 leads plus tab). PCB layout, land pattern, and mounting requirements are identical. No design modifications are necessary for mechanical integration.

Q: What protection features are included in each part?

A: The MIC39300-2.5BU TR and MIC39300-2.5WU-TR include over current, over temperature, and reverse polarity protection. The SPX29300T-L-2-5/TR includes over current, reverse polarity, and transient voltage protection. All three parts provide essential circuit protection for typical applications.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, within the specified electrical operating range. The MIC39300-2.5WU-TR is the direct equivalent. The SPX29300T-L-2-5/TR is functionally compatible but requires verification that the 0.8V dropout voltage specification does not impact system performance. Both parts maintain the same output voltage, current rating, and temperature range.

Q: What is the inventory status for each part?

A: The MIC39300-2.5BU TR (obsolete) has 4140 units in stock. The MIC39300-2.5WU-TR (active) has 7050 units in stock. The SPX29300T-L-2-5/TR (active) has 5434 units in stock. Active parts offer superior long-term availability for production planning.