Hammond Manufacturing 630C Pulse Transformer Equivalent & Substitute Parts

Part Overview

The Hammond Manufacturing 630C is a 4mH SCR and Triac Trigger pulse transformer with a 1:1 turns ratio, designed for through-hole mounting applications. This component features an encapsulated design with dimensions of 25.00mm L x 20.00mm W and a seated height of 13.00mm. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations.

Substiute Parts

630C

Hammond ManufacturingIn Stock: 712630C Datasheet

Current PartRFQ

77204C

Murata Power SolutionsIn Stock: 149877204C Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 630C is determined by the following critical parameters:

• Inductance Value: 4mH (exact match required)
• Turns Ratio: 1:1 (exact match required)
• Transformer Type: SCR and Triac Trigger (Encapsulated)
• Mounting Type: Through Hole
• Regulatory Compliance: ROHS3 Compliant and REACH Unaffected status

The Murata Power Solutions 77204C meets all substitution criteria. Both components share identical inductance, turns ratio, transformer type classification, and mounting methodology. Physical dimensions vary within acceptable tolerances for through-hole applications. Both parts maintain equivalent regulatory compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The Murata Power Solutions 77204C serves as the direct functional equivalent for the obsolete Hammond Manufacturing 630C. Selection of the 77204C is supported by:

• Identical inductance specification (4mH)
• Matching 1:1 turns ratio
• Equivalent transformer type classification for SCR and Triac trigger applications
• Compatible through-hole mounting interface
• Active product status with current manufacturing support
• Full ROHS3 and REACH compliance alignment

Physical dimensions between the two components are within acceptable tolerances for PCB through-hole mounting. The 77204C provides documented operating temperature range (0°C ~ 70°C) and ET specification (240VµS), offering additional technical clarity for system design validation.

Frequently Asked Questions (FAQ)

Q: What makes the Murata 77204C a valid substitute for the Hammond 630C?

A: Both components share identical core electrical specifications: 4mH inductance, 1:1 turns ratio, and SCR/Triac trigger transformer classification. Both employ through-hole mounting and maintain equivalent regulatory compliance (ROHS3, REACH Unaffected).

Q: Are there physical compatibility concerns between these components?

A: Physical dimensions differ slightly. The 77204C measures 25.40mm L x 20.30mm W x 12.30mm H (seated), compared to the 630C at 25.00mm L x 20.00mm W x 13.00mm H. These variations remain within acceptable tolerances for standard through-hole PCB applications.

Q: Why is the Hammond 630C classified as obsolete?

A: The 630C is no longer in active production. The Murata 77204C represents the current-generation equivalent, available through active manufacturing channels.

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

A: The 77204C specifies 240VµS ET, defining the volt-time product characteristic. This parameter was not documented for the 630C but is standard for pulse transformer applications in SCR and Triac trigger circuits.

Q: Can the 77204C be used in existing designs originally specified for the 630C?

A: Yes. Electrical and mechanical compatibility is established through matching inductance, turns ratio, transformer type, and mounting methodology. PCB layout accommodation for minor dimensional variations may be required.