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Murata Power Solutions 78604/8MC Pulse Transformer - Equivalent & Substitute Parts
Part Overview
The Murata Power Solutions 78604/8MC is a 1mH general purpose pulse transformer with a 2:1 turns ratio, designed for surface mount applications. This component features a compact footprint of 0.375" L x 0.354" W (9.52mm x 9.00mm) and operates across the 0°C to 70°C temperature range. The part carries a "Not For New Designs" status, indicating it has been superseded in Murata's product portfolio. Organizations currently using this component in active designs require qualified substitute parts to ensure continuity of supply and maintain design compatibility.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Inductance | 1mH |
| Turns Ratio (Primary:Secondary) | 2:1 |
| ET (Volt-Time Product) | 15VµS |
| Mounting Type | Surface Mount |
| Physical Dimensions | 0.375" L x 0.354" W x 0.250" H max (9.52mm x 9.00mm x 6.35mm) |
| Operating Temperature Range | 0°C to 70°C |
| Transformer Type | General Purpose |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | MSL 1 (Unlimited) |
Substitute Part Grouping Explanation
The 78604/8MC has one qualified substitute: the 78604/8JC. Substitution eligibility is determined by the following critical parameters that must remain constant or compatible:
- Turns Ratio (Primary:Secondary): Must remain 2:1
- ET (Volt-Time Product): Must remain 15VµS
- Mounting Type: Must remain Surface Mount
- Physical Dimensions: Must match 0.375" L x 0.354" W footprint
- Operating Temperature Range: Must cover 0°C to 70°C minimum
- Transformer Type: Must remain General Purpose
The 78604/8JC meets all substitution criteria. The primary difference is inductance specification: the substitute operates at 850µH compared to the main part's 1mH. This inductance variance falls within the acceptable tolerance band for general purpose pulse transformer applications while maintaining identical electrical performance characteristics (ET product, turns ratio) and physical compatibility (footprint, height, mounting).
Parameter Comparison
| Parameter | 78604/8MC (Main Part) | 78604/8JC (Substitute) |
|---|---|---|
| Manufacturer | Murata Power Solutions Inc. | Murata Power Solutions Inc. |
| Inductance | 1mH | 850µH |
| Turns Ratio | 2:1 | 2:1 |
| ET (Volt-Time) | 15VµS | 15VµS |
| Transformer Type | General Purpose | General Purpose |
| Mounting Type | Surface Mount | Surface Mount |
| Dimensions (L x W) | 0.375" x 0.354" (9.52mm x 9.00mm) | 0.375" x 0.354" (9.52mm x 9.00mm) |
| Height - Seated (Max) | 0.250" (6.35mm) | 0.250" (6.35mm) |
| Operating Temperature | 0°C to 70°C | 0°C to 70°C |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level | MSL 1 (Unlimited) | MSL 1 (Unlimited) |
| Product Status | Not For New Designs | Active |
Engineering Selection Recommendations
The 78604/8JC is the designated substitute for the 78604/8MC. Selection between these parts should be based on product lifecycle status and supply availability:
The 78604/8MC carries "Not For New Designs" status, indicating Murata has transitioned this component out of active production. The 78604/8JC maintains "Active" product status, ensuring ongoing availability and manufacturing support. Both parts maintain identical RoHS3 compliance and MSL 1 moisture sensitivity ratings, confirming equivalent environmental and regulatory qualification.
For designs currently using the 78604/8MC, transition to the 78604/8JC is supported by matching physical footprint, identical turns ratio, and equivalent ET product specification. The inductance difference (850µH vs. 1mH) reflects the component's classification as a general purpose pulse transformer where this variance remains within functional tolerance for the application category.
Frequently Asked Questions (FAQ)
Q: Can the 78604/8JC directly replace the 78604/8MC in existing PCB layouts?
A: Yes. Both parts share identical surface mount footprint dimensions (0.375" L x 0.354" W) and maximum seated height (0.250"), ensuring direct PCB compatibility without layout modification.
Q: What is the significance of the inductance difference between these parts?
A: The 78604/8MC specifies 1mH inductance while the 78604/8JC specifies 850µH. Both maintain the same ET (Volt-Time) product of 15VµS and identical 2:1 turns ratio. For general purpose pulse transformer applications, this inductance variance is within acceptable operating tolerance.
Q: Are there compliance or certification differences between these parts?
A: Both parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating. The 78604/8MC is REACH Affected while the 78604/8JC is REACH Unaffected. Both carry EAR99 ECCN classification.
Q: Why is the 78604/8MC marked "Not For New Designs"?
A: This designation indicates Murata has concluded the active production phase for this component. The 78604/8JC, marked as "Active," represents the current production equivalent and is recommended for new design implementations.
Q: What packaging format is used for both parts?
A: Both the 78604/8MC and 78604/8JC are supplied in Tube packaging, suitable for automated assembly processes.
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