FD8-56 Equivalent & Substitute Parts Reference

Part Overview

The FD8-56 is a laminated core power transformer manufactured by Triad Magnetics, rated at 100VA with dual primary windings (115V/230V) and a single 56V secondary winding with center tap. This chassis mount transformer is designed for applications requiring isolated AC power conversion with a maximum output current of 1.8A. The part is currently active in production with ROHS3 compliance and 2500VAC isolation rating.

Equivalent and substitute parts are identified when component availability changes, supply chain disruptions occur, or design flexibility permits functional alternatives. The FD8-56 has one direct substitute available that maintains electrical and mechanical compatibility within specified tolerances.

Substiute Parts

FD8-56

Triad MagneticsIn Stock: 1037FD8-56 Datasheet

Current PartRFQ

DP-241-8-56

Signal TransformerIn Stock: 1297DP-241-8-56 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FD8-56 is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match Exactly):

• Primary voltage configuration: 115V/230V dual winding
• Secondary voltage: 56V
• Maximum output current: 1.8A
• Power rating: 100VA
• Center tap presence: Required
• Isolation voltage: 2500VAC minimum

Mechanical Parameters (Must Match or Be Within Tolerance):

• Mounting type: Chassis mount
• Termination style: Solder and Quick Connect compatible
• Physical dimensions: Length, width, and height within manufacturing tolerances
• Weight: Consistent with core and winding materials

Compliance Parameters (Must Match):

• RoHS3 compliance status
• REACH status
• Core type: Laminated

The DP-241-8-56 from Signal Transformer satisfies all substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection: FD8-56 (Triad Magnetics)

The FD8-56 is the original specified component and remains the preferred selection when available. Current inventory status shows 959 units in stock. This part carries active product status with full ROHS3 compliance and REACH unaffected designation, confirming ongoing manufacturer support and regulatory compliance.

Substitute Selection: DP-241-8-56 (Signal Transformer)

The DP-241-8-56 is a direct functional equivalent suitable for substitution when FD8-56 availability is constrained. This part demonstrates:

• Identical electrical specifications across all critical parameters
• Physical dimensions within standard manufacturing tolerances
• Equivalent compliance certifications (ROHS3, REACH, EAR99)
• Active product status with higher current inventory (1199 units)
• Compatible termination methods for direct circuit board integration

Both parts are classified as active products with current manufacturer support. Selection between these parts should be based on availability, lead time, and supply chain considerations rather than technical performance differences.

Frequently Asked Questions (FAQ)

Q: Can the DP-241-8-56 be used as a direct replacement for the FD8-56 in existing designs?

A: Yes. The DP-241-8-56 meets all electrical and mechanical specifications required for direct substitution. Identical primary and secondary voltages, current ratings, winding configurations, and isolation voltage ensure functional compatibility. Physical dimensions are within standard manufacturing tolerances for chassis mount applications.

Q: Are there any differences in termination compatibility between these parts?

A: Both parts support Solder and Quick Connect termination methods. The FD8-56 specifies 0.187" (4.7mm) quick connect terminals, while the DP-241-8-56 lists Quick Connect without specific dimension notation. Verify connector compatibility with your specific PCB or wiring harness design before substitution.

Q: Do both parts meet the same regulatory and compliance requirements?

A: Yes. Both the FD8-56 and DP-241-8-56 carry ROHS3 compliance certification, REACH unaffected status, and EAR99 export classification. Both are assigned the same HTSUS code (8504.31.4065), confirming equivalent regulatory treatment.

Q: What is the significance of the center tap in these transformers?

A: The center tap on the secondary winding enables center-tapped rectifier circuits and provides a reference point for split-rail power supplies. Both parts include this feature, making them suitable for applications requiring center-tapped secondary configurations. Omitting the center tap connection does not affect standard full-wave bridge rectifier operation.

Q: Are there any physical installation considerations when substituting the DP-241-8-56 for the FD8-56?

A: Physical dimensions differ slightly within acceptable tolerances. The DP-241-8-56 is 1.35mm wider and 2.63mm taller than the FD8-56. Verify that your chassis or mounting bracket accommodates these dimensional variations. Both parts are chassis mount type with identical weight, so structural support requirements remain unchanged.

Q: What packaging differences exist between these parts?

A: The FD8-56 is supplied in Box packaging, while the DP-241-8-56 is supplied in Bulk packaging. This affects receiving, storage, and handling procedures but does not impact electrical or mechanical performance. Confirm packaging requirements with your procurement and inventory management processes.

Q: Can these transformers be used interchangeably in 115V and 230V primary applications?

A: Yes. Both parts feature dual primary windings supporting 115V and 230V operation. The transformer configuration allows selection of either primary voltage through appropriate winding connection. Secondary voltage output (56V) and current capacity (1.8A) remain constant regardless of primary voltage selection.