Murata Power Solutions 78604/1MC Pulse Transformer - Equivalent & Substitute Parts

Part Overview

The Murata Power Solutions 78604/1MC is a 2mH general purpose pulse transformer with a 2:1 turns ratio, designed for surface mount applications. This component features a compact form factor (9.52mm × 9.00mm × 6.35mm) and operates across the 0°C to 70°C temperature range. The 78604/1MC is classified as "Not For New Designs," indicating it has reached end-of-life status. Organizations currently using this component in active production or maintenance applications require qualified substitute parts to ensure design continuity and supply chain reliability.

Substiute Parts

78604/1MC

Murata Power Solutions Inc.In Stock: 66978604/1MC Datasheet

Current PartRFQ

78604/1JC

Murata Power SolutionsIn Stock: 123278604/1JC Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 78604/1MC is determined by the following critical parameters:

• Turns Ratio: Must remain 2:1 (primary to secondary)
• Mounting Type: Must be surface mount to maintain PCB compatibility
• Physical Footprint: Dimensions must be 0.375" L × 0.354" W (9.52mm × 9.00mm) to fit existing board layouts
• Height Constraint: Maximum seated height of 0.250" (6.35mm) required for clearance
• Operating Temperature: Must support 0°C to 70°C range
• Transformer Classification: General purpose pulse transformer application
• ET Product: 20VµS specification for pulse handling capability

The 78604/1JC qualifies as a direct substitute based on these parameters. While the inductance differs slightly (1.84mH versus 2mH), the ET product remains constant at 20VµS, and all mechanical, thermal, and electrical interface requirements are maintained.

Parameter Comparison

Engineering Selection Recommendations

The 78604/1JC is the qualified substitute for the 78604/1MC based on the following factors:

Product Status: The 78604/1MC is designated "Not For New Designs," making the active-status 78604/1JC the appropriate long-term solution for ongoing production and maintenance requirements.

Compliance Profile: Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings. The 78604/1JC offers improved regulatory standing with REACH Unaffected status, compared to the 78604/1MC's REACH Affected classification.

Electrical and Mechanical Compatibility: The substitute maintains identical turns ratio (2:1), ET product (20VµS), mounting type, physical footprint, height constraint, and operating temperature range. The inductance variance (1.84mH versus 2mH) occurs within the tolerance envelope defined by the constant ET specification.

Supply Continuity: The 78604/1JC demonstrates active inventory availability (1191 pieces in stock) and active product status, ensuring reliable procurement for current and future applications.

Frequently Asked Questions (FAQ)

Q: Can the 78604/1JC directly replace the 78604/1MC in existing designs?

A: Yes. The 78604/1JC maintains identical mechanical fit (footprint and height), electrical interface (2:1 turns ratio, 20VµS ET product), mounting type (surface mount), and operating temperature range (0°C to 70°C). The inductance difference (1.84mH versus 2mH) is within the tolerance defined by the constant ET specification.

Q: Why does the inductance differ between the original and substitute?

A: The ET (volt-time product) specification of 20VµS is the controlling parameter for pulse transformer performance in this application category. The inductance variance reflects design optimization within this constraint while maintaining functional equivalence.

Q: Are there any compliance differences between these parts?

A: Both parts are ROHS3 compliant with MSL 1 (Unlimited) ratings. The 78604/1JC offers improved regulatory status as REACH Unaffected, whereas the 78604/1MC is REACH Affected. Both carry EAR99 ECCN classification.

Q: What is the physical compatibility of the 78604/1JC with existing PCB layouts?

A: The 78604/1JC maintains identical dimensions (0.375" L × 0.354" W / 9.52mm × 9.00mm) and maximum seated height (0.250" / 6.35mm), ensuring direct PCB footprint compatibility without layout modifications.

Q: Is the 78604/1JC available in the same packaging format?

A: Yes. Both the original 78604/1MC and substitute 78604/1JC are supplied in tube packaging, maintaining consistency with existing procurement and assembly processes.