MIC39100-3.3BS Equivalent & Substitute Parts

Part Overview

The MIC39100-3.3BS is a linear voltage regulator IC from Microchip Technology designed to deliver a fixed 3.3V output at 1A in a surface-mount SOT-223-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The MIC39100-3.3BS provides positive fixed output regulation with integrated protection features including over-current, over-temperature, and reverse-polarity protection across an operating temperature range of -40°C to 125°C.

Substiute Parts

MIC39100-3.3BS

Microchip TechnologyIn Stock: 30254MIC39100-3.3BS Datasheet

Current PartRFQ

MIC39100-3.3WS

Microchip TechnologyIn Stock: 37341MIC39100-3.3WS Datasheet

DirectRFQ

SPX3940AM3-L-3-3/TR

MaxLinear, Inc.In Stock: 95240SPX3940AM3-L-3-3/TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MIC39100-3.3BS are qualified based on the following electrical and mechanical parameters:

• Fixed output voltage of 3.3V
• Output current capability of 1A
• Maximum input voltage of 16V
• SOT-223-3 package compatibility
• Surface-mount technology
• Operating temperature range of -40°C to 125°C
• Positive fixed output configuration
• Core protection features: over-current and over-temperature protection

Two substitute parts meet these criteria: the MIC39100-3.3WS (direct Microchip equivalent) and the SPX3940AM3-L-3-3/TR (MaxLinear alternative).

Parameter Comparison

Engineering Selection Recommendations

The MIC39100-3.3WS is the direct equivalent from Microchip Technology, maintaining identical electrical specifications while offering active product status and ROHS3 compliance. This part is suitable for designs requiring continuity with the original MIC39100-3.3BS specification.

The SPX3940AM3-L-3-3/TR from MaxLinear provides an alternative with improved dropout voltage performance (0.55V versus 0.63V at 1A), RoHS compliance, and superior moisture sensitivity rating (MSL 1 versus MSL 3). This part is recommended for new designs and applications where lower dropout voltage or enhanced environmental protection is beneficial.

Both substitute parts maintain electrical and mechanical compatibility with the original MIC39100-3.3BS within the specified parameter ranges.

Frequently Asked Questions (FAQ)

Q: Can the MIC39100-3.3WS be used as a direct replacement for the MIC39100-3.3BS?

A: Yes. The MIC39100-3.3WS shares identical electrical specifications and SOT-223-3 package configuration. The primary differences are product status (active versus obsolete) and RoHS compliance level.

Q: What is the advantage of the SPX3940AM3-L-3-3/TR over the MIC39100-3.3WS?

A: The SPX3940AM3-L-3-3/TR offers lower dropout voltage (0.55V versus 0.63V at 1A) and an improved moisture sensitivity rating (MSL 1 unlimited versus MSL 3 at 168 hours), making it suitable for applications with stricter environmental or thermal requirements.

Q: Are all three parts pin-compatible?

A: All three parts use the SOT-223-3 package and maintain compatible pinout for the specified application. Verify PCB layout compatibility with your design before implementation.

Q: What is the difference between the packaging formats listed?

A: MIC39100-3.3BS is supplied in bulk format, MIC39100-3.3WS in tube packaging, and SPX3940AM3-L-3-3/TR in tape and reel format. Packaging selection depends on production volume and assembly requirements.

Q: Are there compliance differences between the substitute parts?

A: The MIC39100-3.3BS is RoHS non-compliant. Both MIC39100-3.3WS (ROHS3 compliant) and SPX3940AM3-L-3-3/TR (RoHS compliant) meet current RoHS standards. Select based on your application's regulatory requirements.