MIC38HC45-1YM Equivalent & Substitute Parts

Part Overview

The MIC38HC45-1YM is a DC-DC controller IC manufactured by Microchip Technology, designed for multi-topology power conversion applications including buck, boost, flyback, and forward converter topologies. This device functions as a transistor driver with step-up, step-down, and step-up/step-down capability, supporting positive output configuration with isolation capability. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are necessary when the primary part experiences supply constraints, when design requirements mandate specific manufacturer certifications, or when application-specific performance characteristics necessitate alternative controller architectures.

Substiute Parts

MIC38HC45-1YM

Microchip TechnologyIn Stock: 731MIC38HC45-1YM Datasheet

Current PartRFQ

MIC38HC45-1YM

Microchip TechnologyIn Stock: 731MIC38HC45-1YM Datasheet

Parametric EquivalentRFQ

UC2845D

onsemiIn Stock: 1673UC2845D Datasheet

MFR RecommendedRFQ

UC2845DTR

Texas InstrumentsIn Stock: 3651UC2845DTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MIC38HC45-1YM is determined by the following critical parameters: package type (14-SOIC form factor), output type (transistor driver), mounting method (surface mount), operating temperature range (-40°C ~ 85°C), and functional capability (multi-topology DC-DC controller supporting step-up, step-down, and combined topologies). The UC2845D and UC2845DTR are functionally equivalent PWM controller devices that share the identical 14-SOIC package footprint and operating temperature specification. Both substitute parts maintain the same electrical interface requirements and are designed for identical application topologies. Substitution is valid when the application does not mandate specific manufacturer certifications beyond standard compliance requirements and when the controller's frequency control and duty cycle characteristics align with circuit design parameters.

Parameter Comparison

Engineering Selection Recommendations

The MIC38HC45-1YM remains the primary selection for new designs due to its active product status and ROHS3 compliance certification. The UC2845DTR manufactured by Texas Instruments is a direct functional substitute with active product status and equivalent ROHS3 compliance, making it suitable for applications where Microchip supply is constrained. The UC2845D from onsemi shares identical package and thermal specifications but carries obsolete product status and RoHS non-compliance, limiting its application to legacy system maintenance or non-regulated markets where environmental compliance is not mandated. Selection between MIC38HC45-1YM and UC2845DTR should be based on supply availability and manufacturer qualification requirements specific to the end application, as both devices meet current compliance standards and maintain active production status.

Frequently Asked Questions (FAQ)

Q: Can UC2845D be used as a direct replacement for MIC38HC45-1YM in new production designs?

A: No. While UC2845D shares the identical 14-SOIC package and operating temperature range, it carries obsolete product status and RoHS non-compliance. New production designs should use either the MIC38HC45-1YM or UC2845DTR to ensure compliance with current environmental regulations and long-term supply continuity.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the 14-SOIC package with 0.154" width and 3.90mm dimensions, ensuring identical PCB footprint compatibility and pin assignment alignment.

Q: What is the primary difference between UC2845D and UC2845DTR?

A: UC2845D is manufactured by onsemi and is obsolete with RoHS non-compliance. UC2845DTR is manufactured by Texas Instruments, maintains active product status, and is ROHS3 compliant. Both share identical package specifications and operating temperature range.

Q: Does moisture sensitivity level affect substitution eligibility?

A: Moisture sensitivity level (MSL) 1 indicates unlimited shelf life without moisture control requirements. MIC38HC45-1YM and UC2845DTR both specify MSL 1. UC2845D does not specify MSL, which may impact handling and storage procedures in moisture-sensitive environments.

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

A: Yes, provided the existing design does not mandate specific manufacturer certifications or performance characteristics unique to one manufacturer. The identical package footprint and operating temperature specifications ensure mechanical and thermal compatibility across all three parts.