MIC37100-3.3BS Equivalent & Substitute Parts

Part Overview

The MIC37100-3.3BS is a linear voltage regulator IC from Microchip Technology designed to deliver a fixed 3.3V output at 1A in a SOT-223-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The regulator provides over-current and over-temperature protection across an operating range of -40°C to 125°C with a maximum input voltage of 6V and dropout voltage of 0.5V at full load.

Substiute Parts

MIC37100-3.3BS

Microchip TechnologyIn Stock: 3384MIC37100-3.3BS Datasheet

Current PartRFQ

MIC37100-3.3WS

Microchip TechnologyIn Stock: 18880MIC37100-3.3WS Datasheet

DirectRFQ

AP2114HA-3.3TRG1

Diodes IncorporatedIn Stock: 48176AP2114HA-3.3TRG1 Datasheet

MFR RecommendedRFQ

AP7361-33E-13

Diodes IncorporatedIn Stock: 30425AP7361-33E-13 Datasheet

MFR RecommendedRFQ

AP7361-33ER-13

Diodes IncorporatedIn Stock: 2414AP7361-33ER-13 Datasheet

MFR RecommendedRFQ

LT1963AEST-3.3#PBF

Analog Devices Inc.In Stock: 5942LT1963AEST-3.3#PBF Datasheet

MFR RecommendedRFQ

LT1963AEST-3.3#TRPBF

Analog Devices Inc.In Stock: 46519LT1963AEST-3.3#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MIC37100-3.3BS is determined by the following critical parameters:

• Fixed output voltage of 3.3V
• Output current capability of 1A or greater
• Maximum input voltage of 6V or greater
• Dropout voltage performance at rated load
• Operating temperature range compatibility (-40°C to 125°C minimum)
• Surface mount package (SOT-223-3 or equivalent footprint)
• Protection against over-current and over-temperature conditions

Substitute parts are grouped into two categories: direct equivalents from the same manufacturer and cross-manufacturer alternatives that meet or exceed the electrical specifications of the original part.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Recommended for Immediate Replacement): MIC37100-3.3WS is the primary substitute for MIC37100-3.3BS. Both parts are from Microchip Technology with identical electrical specifications and package type. The key advantage is that MIC37100-3.3WS is active in production and ROHS3 compliant, addressing the obsolescence and compliance issues of the original part.

Cross-Manufacturer Alternatives: The Diodes Incorporated parts (AP2114HA-3.3TRG1, AP7361-33E-13, AP7361-33ER-13) meet the core electrical requirements with comparable dropout voltages and output current ratings. These parts are active and ROHS3 compliant. The AP7361 series includes short-circuit protection in addition to over-current and over-temperature protection. Operating temperature range is limited to -40°C to 85°C, which is narrower than the original part.

The Analog Devices LT1963AEST series (both #PBF and #TRPBF variants) offers enhanced specifications including higher output current (1.5A), higher maximum input voltage (20V), and full operating temperature range matching the original (-40°C to 125°C). These parts include enable control and reverse polarity protection. Both variants are active and ROHS3 compliant, with the primary difference being packaging format (tube versus cut tape).

Compliance Considerations: All substitute parts listed are ROHS3 compliant, addressing the non-compliance status of the obsolete MIC37100-3.3BS. Selection should prioritize active production status parts to ensure long-term availability.

Frequently Asked Questions (FAQ)

Q: Can MIC37100-3.3WS be used as a direct drop-in replacement for MIC37100-3.3BS? A: Yes. MIC37100-3.3WS is electrically and mechanically identical to MIC37100-3.3BS with the same output voltage, current rating, dropout voltage, and SOT-223-3 package. The primary differences are active production status and ROHS3 compliance.

Q: What are the key differences between the Diodes Incorporated and Analog Devices substitutes? A: Diodes Incorporated parts (AP2114HA, AP7361 series) maintain the 1A output current and 6V maximum input voltage of the original part with slightly higher dropout voltages (0.7V to 0.75V). Operating temperature range is reduced to -40°C to 85°C. Analog Devices LT1963AEST parts offer higher output current (1.5A), higher input voltage tolerance (20V), and full temperature range (-40°C to 125°C) matching the original, with lower dropout voltage (0.55V).

Q: Are there package compatibility concerns with AP7361-33ER-13? A: AP7361-33ER-13 uses SOT-223R package instead of standard SOT-223-3. While both are surface mount packages with similar footprints, PCB layout verification is required to confirm mechanical compatibility before implementation.

Q: Which substitute part is best for applications requiring the full -40°C to 125°C temperature range? A: MIC37100-3.3WS (same manufacturer) or LT1963AEST series (Analog Devices) both support the full -40°C to 125°C operating range. MIC37100-3.3WS provides identical specifications, while LT1963AEST offers enhanced current and input voltage capabilities.

Q: Do all substitute parts include the same protection features as the original? A: All listed substitutes include over-current and over-temperature protection. The AP7361 series and LT1963AEST series add short-circuit protection. LT1963AEST additionally includes reverse polarity protection and enable control functionality not present in the original part.

Q: What is the difference between LT1963AEST-3.3#PBF and LT1963AEST-3.3#TRPBF? A: Both parts are electrically identical with the same specifications. The difference is packaging format: #PBF is supplied in tube packaging, while #TRPBF is supplied in cut tape with digi-reel format. Selection depends on assembly process requirements and inventory management preferences.