MIC39500-1.8BU Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MIC39500-1.8BU is a linear voltage regulator IC from Microchip Technology designed for positive fixed 1.8V output applications with 5A current capacity in a TO-263-3 surface mount package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The MIC39500-1.8BU provides regulated 1.8V output with integrated over-current, over-temperature, and reverse polarity protection across an operating temperature range of -40°C to 125°C.

Substiute Parts

MIC39500-1.8BU

Microchip TechnologyIn Stock: 3812MIC39500-1.8BU Datasheet

Current PartRFQ

MIC39500-1.8WU

Microchip TechnologyIn Stock: 3069MIC39500-1.8WU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MIC39500-1.8BU is determined by strict equivalence across the following electrical and mechanical parameters:

• Output voltage: 1.8V fixed
• Output current capacity: 5A
• Input voltage maximum: 16V
• Dropout voltage: 0.575V @ 5A
• Package type: TO-263-3 (D2PAK)
• Mounting type: Surface Mount
• Protection features: Over Current, Over Temperature, Reverse Polarity
• Operating temperature range: -40°C to 125°C

The MIC39500-1.8WU qualifies as a direct substitute based on identical electrical specifications and package configuration. The primary distinction is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The MIC39500-1.8WU is the direct equivalent substitute for the MIC39500-1.8BU. Both parts share identical electrical performance and mechanical specifications. Selection between these parts should be based on the following factors:

Product Status: The MIC39500-1.8BU is obsolete, while the MIC39500-1.8WU is active. For new designs and long-term production, the MIC39500-1.8WU is the appropriate choice.

Compliance Certification: The MIC39500-1.8WU meets ROHS3 compliance requirements, whereas the MIC39500-1.8BU is RoHS non-compliant. Applications subject to RoHS regulations require the MIC39500-1.8WU.

Packaging: The MIC39500-1.8BU is supplied in bulk packaging, while the MIC39500-1.8WU is supplied in tube packaging. Packaging selection depends on production volume and handling requirements.

Both parts carry identical REACH Unaffected and EAR99 ECCN classifications, with matching Moisture Sensitivity Level (MSL) ratings of 3 (168 Hours).

Frequently Asked Questions (FAQ)

Q: Can the MIC39500-1.8WU directly replace the MIC39500-1.8BU in existing designs?

A: Yes. The MIC39500-1.8WU provides identical electrical performance and mechanical compatibility. No circuit modifications are required for substitution.

Q: What is the difference between the MIC39500-1.8BU and MIC39500-1.8WU?

A: The parts are electrically and mechanically equivalent. The MIC39500-1.8WU is the active production version with ROHS3 compliance, while the MIC39500-1.8BU is obsolete and RoHS non-compliant. Packaging differs: bulk versus tube.

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

A: No. Both parts deliver identical output voltage (1.8V), output current (5A), dropout voltage (0.575V @ 5A), and operating temperature range (-40°C to 125°C).

Q: What package type is used for both parts?

A: Both the MIC39500-1.8BU and MIC39500-1.8WU use the TO-263-3 package (D2PAK with 3 leads plus tab) for surface mount applications.

Q: Which part should be selected for new production?

A: The MIC39500-1.8WU should be selected for new designs and ongoing production. It is the active equivalent with current availability and modern compliance certifications.

Q: Are the protection features identical between both parts?

A: Yes. Both parts include over-current, over-temperature, and reverse polarity protection.