FD8-20 Equivalent & Substitute Parts Reference

Part Overview

The FD8-20 is a laminated core power transformer manufactured by Triad Magnetics, rated for 100VA maximum power with dual primary windings (115V/230V) and a single secondary winding (20V, 5A maximum output). This chassis mount transformer features a center tap on the secondary winding and is designed for solder and quick connect termination. The part is currently active in production with ROHS3 compliance and 2500VAC isolation rating.

Substitute parts are identified when equivalent electrical specifications, mechanical dimensions, mounting characteristics, and regulatory compliance are maintained within acceptable engineering tolerances for direct component replacement in existing designs.

Substiute Parts

FD8-20

Triad MagneticsIn Stock: 1162FD8-20 Datasheet

Current PartRFQ

DP-241-8-20

Signal TransformerIn Stock: 793DP-241-8-20 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The DP-241-8-20 manufactured by Signal Transformer qualifies as a direct substitute for the FD8-20 based on the following critical parameters:

Electrical Equivalence: Both transformers maintain identical power ratings (100VA), primary voltage configurations (115V/230V dual), secondary voltage output (20V), and maximum secondary current (5A). Both feature center-tapped secondary windings and laminated core construction.

Mechanical Compatibility: Chassis mount orientation and termination style (Solder, Quick Connect) are identical. Physical dimensions are within acceptable manufacturing tolerances (length 102.39mm vs 102.40mm, width 57.15mm vs 58.50mm, height 65.07mm vs 67.70mm). Weight specifications are equivalent (2.8 lbs / 1.3 kg).

Regulatory Compliance: Both parts maintain ROHS3 compliance, identical isolation voltage ratings (2500VAC/2500Vrms), and equivalent ECCN and HTSUS classifications.

Product Status: Both parts are active in production with current inventory availability.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: The FD8-20 (Triad Magnetics) is the specified component for original designs and should be used when available. Current inventory status shows 1112 pieces in stock.

Substitute Selection: The DP-241-8-20 (Signal Transformer) is an acceptable direct substitute when FD8-20 availability is constrained. This part maintains full electrical and mechanical equivalence with current inventory of 724 pieces available.

Compliance Basis: Both parts satisfy ROHS3 compliance requirements and maintain identical regulatory classifications (ECCN EAR99, HTSUS 8504.31.4065). Both are REACH Unaffected and carry equivalent isolation voltage ratings suitable for industrial and commercial power supply applications.

Dimensional Tolerance: The DP-241-8-20 exhibits minor dimensional variations in width (1.35mm greater) and height (2.63mm greater) compared to the FD8-20. These variations remain within standard chassis mount transformer manufacturing tolerances and do not affect functional performance or mechanical fit in standard mounting configurations.

Frequently Asked Questions (FAQ)

Q: Can the DP-241-8-20 be used as a direct replacement for the FD8-20 in existing circuit designs?

A: Yes. The DP-241-8-20 maintains identical electrical specifications (100VA, 115V/230V primary, 20V secondary, 5A output, center-tapped secondary) and equivalent mechanical mounting characteristics. Both transformers use identical termination styles and are rated for the same isolation voltage (2500VAC/Vrms).

Q: Are there any dimensional differences that would affect mounting?

A: The DP-241-8-20 is slightly larger in width (1.35mm) and height (2.63mm) compared to the FD8-20. Both are chassis mount transformers with equivalent footprints. Verify available mounting space in your specific application, though these variations typically fall within standard tolerance ranges for transformer mounting brackets.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the FD8-20 and DP-241-8-20 are ROHS3 compliant, REACH Unaffected, and classified under identical ECCN (EAR99) and HTSUS (8504.31.4065) codes. Both maintain 2500VAC isolation ratings.

Q: What is the difference between the primary winding configurations?

A: Both transformers feature dual primary windings, allowing operation at either 115V or 230V input voltage. This configuration is identical in both the FD8-20 and DP-241-8-20.

Q: Are the termination connectors compatible?

A: Both transformers use Solder and Quick Connect - 0.187" (4.7mm) termination styles. Connector compatibility is maintained between the two parts.

Q: Which part should I specify for new designs?

A: Specify the FD8-20 (Triad Magnetics) for new designs. Use the DP-241-8-20 (Signal Transformer) as an alternative only when the primary part is unavailable or when supply chain considerations require dual-source qualification.