Hammond Manufacturing 631C Pulse Transformer Equivalent & Substitute Parts

Part Overview

The Hammond Manufacturing 631C is a 4mH SCR and Triac Trigger pulse transformer with a 1:1:1 turns ratio, designed for through-hole mounting applications. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

631C

Hammond ManufacturingIn Stock: 963631C Datasheet

Current PartRFQ

77205C

Murata Power Solutions Inc.In Stock: 227477205C Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Hammond Manufacturing 631C is determined by the following critical parameters:

• Transformer Type: SCR and Triac Trigger (Encapsulated)
• Inductance: 4mH
• Turns Ratio: 1:1:1
• Mounting Type: Through Hole
• Physical Dimensions: Compatible footprint within tolerance
• Regulatory Compliance: ROHS3 Compliant, REACH Unaffected

The Murata Power Solutions Inc. 77205C meets all substitution criteria, maintaining identical electrical specifications and mounting configuration while offering active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

The Murata Power Solutions Inc. 77205C is the direct equivalent for the obsolete Hammond Manufacturing 631C. Both components share identical core electrical specifications: 4mH inductance, 1:1:1 turns ratio, and SCR/Triac trigger transformer classification.

Physical dimensions are compatible within standard PCB layout tolerances. The Murata 77205C exhibits slightly reduced height (0.484" versus 0.512") and marginally increased length and width, presenting no functional impediment to board-level integration.

Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements. The Murata part offers the advantage of active product status with established supply chain availability, whereas the Hammond 631C is obsolete.

Frequently Asked Questions (FAQ)

Q: Can the Murata 77205C directly replace the Hammond 631C in existing designs?

A: Yes. Both components share identical inductance (4mH), turns ratio (1:1:1), transformer type (SCR and Triac Trigger Encapsulated), and through-hole mounting configuration. Physical dimensions are compatible within standard PCB tolerances.

Q: What is the significance of the ET (Volt-Time) specification?

A: The ET value of 240VµS provided for the Murata 77205C represents the volt-time product, a measure of transformer core saturation characteristics. This specification is not provided for the Hammond 631C in available documentation.

Q: Are there packaging differences between these components?

A: The Hammond 631C packaging specification is listed as dash (not specified). The Murata 77205C is supplied in tube packaging. Both components are through-hole mounted and compatible with standard PCB assembly processes.

Q: Do both components meet current regulatory standards?

A: Yes. Both the Hammond 631C and Murata 77205C are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8504.31.2000.

Q: Why is the Hammond 631C listed as obsolete?

A: Obsolete status indicates the component is no longer manufactured or supported by Hammond Manufacturing. The Murata 77205C maintains active product status with ongoing manufacturing and supply chain support.