MIC38C45BN Equivalent & Substitute Parts

Part Overview

The MIC38C45BN is a multi-topology DC-DC controller IC manufactured by Microchip Technology, designed for buck, boost, flyback, and forward converter applications. This 8-DIP through-hole component provides transistor driver output with step-up, step-down, and step-up/step-down functionality. The MIC38C45BN is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support.

Substiute Parts

MIC38C45BN

Microchip TechnologyIn Stock: 1984MIC38C45BN Datasheet

Current PartRFQ

MIC38C45YN

Microchip TechnologyIn Stock: 1256MIC38C45YN Datasheet

DirectRFQ

UC2845BN

STMicroelectronicsIn Stock: 2001UC2845BN Datasheet

MFR RecommendedRFQ

MIC38HC45YN

Microchip TechnologyIn Stock: 3066MIC38HC45YN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MIC38C45BN are classified based on electrical and mechanical compatibility within the following criteria:

Critical Parameters for Substitution:

• Package / Case: 8-DIP (0.300", 7.62mm) through-hole mounting
• Output Type: Transistor Driver
• Voltage - Supply (Vcc/Vdd): 7.6V minimum to 20V maximum
• Duty Cycle (Max): 50%
• Operating Temperature: -40°C to 85°C minimum
• Number of Outputs: 1
• Output Phases: 1

Substitution Categories:

Direct Manufacturer Equivalent: MIC38C45YN maintains identical electrical specifications and topology support while offering active product status and improved compliance.

Manufacturer Recommended Substitute: UC2845BN provides compatible package and core functionality with extended supply voltage range (7.6V ~ 30V) and higher operating temperature capability (-40°C ~ 150°C TJ), though with reduced topology support (Boost, Flyback only).

Parametric Equivalent: MIC38HC45YN delivers identical topology support and electrical parameters as the original part with active status and enhanced compliance.

Parameter Comparison

Engineering Selection Recommendations

MIC38C45YN is the primary direct equivalent for the MIC38C45BN. Both parts share identical electrical specifications, topology support, and package configuration. MIC38C45YN offers active product status and ROHS3 compliance, making it suitable for new designs and production environments requiring modern component standards.

MIC38HC45YN provides parametric equivalence with identical topology support and electrical parameters. This part is recommended when MIC38C45YN availability is constrained. Both Microchip parts maintain the same supply voltage range and duty cycle specifications.

UC2845BN is the manufacturer-recommended substitute from STMicroelectronics. This part supports extended supply voltage operation (7.6V ~ 30V) and higher junction temperature capability (-40°C ~ 150°C TJ). However, UC2845BN topology support is limited to Boost and Flyback configurations, excluding Buck and Forward Converter modes. Selection of UC2845BN requires verification that the target application operates within Boost or Flyback topology only.

All substitute parts maintain 8-DIP through-hole package compatibility and transistor driver output configuration. Product status and compliance certifications favor the active Microchip alternatives for new production.

Frequently Asked Questions (FAQ)

Q: Can MIC38C45YN directly replace MIC38C45BN in existing designs?

A: Yes. MIC38C45YN maintains identical electrical specifications, package configuration, and topology support. Pin-for-pin compatibility and functional equivalence are confirmed across all critical parameters.

Q: What is the primary difference between MIC38C45YN and MIC38HC45YN?

A: Both parts provide identical topology support and electrical parameters. The primary distinction is product availability and supply chain status. Selection between these Microchip parts depends on inventory and lead time requirements.

Q: When is UC2845BN appropriate as a substitute?

A: UC2845BN is suitable only for applications using Boost or Flyback topologies. Applications requiring Buck or Forward Converter operation must use MIC38C45YN or MIC38HC45YN. UC2845BN offers extended supply voltage range (up to 30V) and higher operating temperature capability, which may benefit specific thermal or power supply requirements.

Q: Are there package or pinout differences between these parts?

A: All substitute parts use 8-DIP (0.300", 7.62mm) through-hole packaging with identical pinout. Direct board-level substitution is supported without layout modifications.

Q: What compliance considerations apply to substitute selection?

A: MIC38C45BN is RoHS non-compliant. All substitute parts (MIC38C45YN, UC2845BN, MIC38HC45YN) are ROHS3 compliant. New designs and production environments should prioritize compliant alternatives.

Q: Does duty cycle difference affect UC2845BN substitution?

A: UC2845BN specifies 48% maximum duty cycle versus 50% for the MIC38C45BN. This 2% difference may impact converter efficiency and design margins in applications operating near maximum duty cycle limits. Verify design specifications before substitution.