FD8-28 Equivalent & Substitute Parts Reference

Part Overview

The FD8-28 is a laminated core power transformer manufactured by Triad Magnetics, rated for 100VA maximum power with dual primary windings (115V/230V) and a single 28V secondary winding with center tap. This chassis mount transformer is designed for applications requiring isolated AC power conversion with flexible input voltage selection. The part is currently active in production with ROHS3 compliance and 2500VAC isolation rating.

Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and regulatory compliance are maintained across manufacturers. This reference enables procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Specification
Power Rating (Max)	100VA
Primary Voltage Options	115V, 230V (Dual Winding)
Secondary Voltage (Full Load)	28V
Secondary Current (Max)	3.6A
Core Type	Laminated
Secondary Configuration	Single Winding with Center Tap
Mounting Type	Chassis Mount
Termination Style	Solder, Quick Connect - 0.187" (4.7mm)
Isolation Voltage	2500VAC
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the FD8-28 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

Power rating: 100VA maximum
Primary voltage configuration: Dual winding supporting both 115V and 230V
Secondary voltage: 28V at full load
Secondary current capacity: 3.6A minimum
Center tap secondary winding: Required
Isolation voltage: 2500VAC minimum

Mechanical Compatibility Requirements:

Mounting type: Chassis mount
Termination style: Solder and Quick Connect 0.187" (4.7mm) connectors
Physical dimensions: Compatible with FD8-28 mounting footprint
Core type: Laminated

Regulatory Compliance Requirements:

RoHS3 compliance mandatory
REACH unaffected status
ECCN classification: EAR99

The DP-241-8-28 from Signal Transformer meets all substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Parameter	FD8-28 (Triad Magnetics)	DP-241-8-28 (Signal Transformer)	Match Status
Power - Max	100VA	100VA	Equivalent
Voltage - Primary	115V, 230V	115V, 230V	Equivalent
Voltage - Secondary (Full Load)	28V	28V	Equivalent
Current - Output (Max)	3.6A	3.6A	Equivalent
Primary Winding(s)	Dual	Dual	Equivalent
Secondary Winding(s)	Single	Single	Equivalent
Center Tap	Yes	Yes	Equivalent
Type	Laminated Core	Laminated Core	Equivalent
Mounting Type	Chassis Mount	Chassis Mount	Equivalent
Termination Style	Solder, Quick Connect - 0.187" (4.7mm)	Solder, Quick Connect	Equivalent
Voltage - Isolation	2500VAC	2500Vrms	Equivalent
Weight	2.8 lbs (1.3 kg)	2.8 lbs (1.3 kg)	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent
ECCN	EAR99	EAR99	Equivalent

Engineering Selection Recommendations

Both the FD8-28 and DP-241-8-28 are active production parts with identical electrical and mechanical specifications. Selection between these transformers may be based on:

Availability and Lead Time: FD8-28 inventory is 875 units; DP-241-8-28 inventory is 1041 units. Both are in stock.

Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and safety standards for industrial and commercial applications.

Series Designation: FD8-28 belongs to the Quick Pack series; DP-241-8-28 belongs to the Two-4-One™ series. Series designation does not affect electrical or mechanical compatibility.

Physical Dimensions: Minor dimensional variations exist (FD8-28: 102.39mm L × 57.15mm W × 65.07mm H; DP-241-8-28: 102.40mm L × 58.50mm W × 67.70mm H). These differences are within typical manufacturing tolerances and do not preclude direct substitution in standard chassis mount applications.

Frequently Asked Questions (FAQ)

Q: Can the DP-241-8-28 directly replace the FD8-28 in existing designs?

A: Yes. The DP-241-8-28 meets all electrical and mechanical specifications of the FD8-28. Both transformers provide identical 100VA power rating, dual 115V/230V primary windings, 28V secondary output with center tap, and 3.6A maximum secondary current. Termination connectors (Solder and Quick Connect 0.187") are compatible. Mounting type (chassis mount) is identical.

Q: Are there any dimensional compatibility concerns?

A: Physical dimensions differ slightly between the two parts. FD8-28 measures 102.39mm L × 57.15mm W × 65.07mm H; DP-241-8-28 measures 102.40mm L × 58.50mm W × 67.70mm H. These variations are within standard manufacturing tolerances. Verify mounting clearance in applications with space constraints.

Q: Do both transformers meet current regulatory requirements?

A: Yes. Both FD8-28 and DP-241-8-28 are ROHS3 compliant and REACH unaffected. Both carry EAR99 ECCN classification. Both maintain 2500VAC isolation voltage rating.

Q: What is the difference between the Quick Pack and Two-4-One™ series designations?

A: Series designations identify manufacturer product lines but do not affect electrical performance or mechanical compatibility. Both series provide equivalent transformer functionality for this specification class.

Q: Which part should be selected for new designs?

A: Either part is suitable for new designs. Selection may be based on supplier preference, inventory availability, or lead time requirements. Both parts are active production items with equivalent specifications.

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