FD4-12 Equivalent & Substitute Parts Reference

Part Overview

The FD4-12 is a laminated core power transformer manufactured by Triad Magnetics, rated at 6VA with dual primary windings (115V/230V) and a single secondary winding (12.6V, 500mA 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 is suitable for applications requiring isolated AC power conversion in compact form factors.

Equivalent substitute parts are identified when component availability, supply chain considerations, or design flexibility require alternative sourcing while maintaining full electrical and mechanical compatibility within the specified parameter tolerances.

Substiute Parts

FD4-12

Triad MagneticsIn Stock: 1172FD4-12 Datasheet

Current PartRFQ

DP-241-4-12

Signal TransformerIn Stock: 1153DP-241-4-12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FD4-12 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Identical power rating (6VA)
• Matching primary voltage configuration (115V/230V dual winding)
• Matching secondary voltage output (12.6V)
• Equal or greater secondary current capacity (500mA minimum)
• Identical isolation voltage rating (2500VAC)
• Center tap secondary winding configuration

Mechanical Equivalence Requirements:

• Chassis mount mounting type
• Compatible termination style (Solder and Quick Connect)
• Laminated core construction

Compliance Requirements:

• ROHS3 compliance
• REACH unaffected status
• EAR99 ECCN classification

The DP-241-4-12 manufactured by Signal Transformer meets all electrical, mechanical, and compliance criteria for direct substitution with the FD4-12.

Parameter Comparison

Engineering Selection Recommendations

Both the FD4-12 and DP-241-4-12 are active production components with identical electrical specifications and full regulatory compliance. Selection between these parts should be based on:

Supply Chain Availability: The DP-241-4-12 currently maintains higher inventory levels (1122 pcs vs. 1080 pcs), which may provide supply chain advantages for high-volume applications.

Mechanical Fit Considerations: Dimensional variations exist within acceptable tolerances. The DP-241-4-12 is slightly shorter (60.30mm vs. 65.07mm) and taller (36.20mm vs. 34.93mm) than the FD4-12. Verify mechanical clearance in the target application before final selection.

Regulatory Compliance: Both parts maintain identical ROHS3, REACH, and EAR99 classifications, ensuring equivalent compliance for all regulated markets.

Series Designation: The FD4-12 belongs to the Quick Pack series, while the DP-241-4-12 is part of the Two-4-One™ series. Series designation does not affect electrical or mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the DP-241-4-12 be used as a direct replacement for the FD4-12 in existing designs?

A: Yes. The DP-241-4-12 meets all electrical specifications (6VA, 115V/230V primary, 12.6V secondary, 500mA output, 2500VAC isolation) and mechanical requirements (chassis mount, solder/quick connect termination). Verify dimensional clearance in your specific PCB or chassis layout, as minor dimensional variations exist within acceptable tolerances.

Q: Are there any differences in termination compatibility?

A: Both parts feature solder and quick connect termination styles. The FD4-12 specifies 0.187" (4.7mm) quick connect terminals. The DP-241-4-12 termination is compatible with this standard. Confirm terminal gauge and spacing match your application's connector specifications.

Q: Do both parts support dual primary voltage selection?

A: Yes. Both the FD4-12 and DP-241-4-12 feature dual primary windings supporting 115V and 230V operation. Primary voltage selection is determined by winding configuration in your circuit design.

Q: What is the significance of the center tap on the secondary winding?

A: The center tap on the 12.6V secondary winding allows the transformer to provide either 12.6V (full secondary voltage) or 6.3V (half secondary voltage) depending on circuit configuration. Both parts include this center tap feature.

Q: Are compliance certifications identical between these parts?

A: Yes. Both the FD4-12 and DP-241-4-12 carry ROHS3 compliance, REACH unaffected status, and EAR99 ECCN classification. No compliance differences exist between these parts.

Q: What are the dimensional tolerances for mechanical fit?

A: The DP-241-4-12 dimensions are: 60.30mm L × 33.30mm W × 36.20mm H (seated). The FD4-12 dimensions are: 65.07mm L × 31.75mm W × 34.93mm H (seated). Dimensional variations are within standard manufacturing tolerances for this transformer category. Verify clearance in your specific mechanical design.

Q: Can I use these transformers interchangeably in production?

A: Yes, provided your design accommodates the minor dimensional variations. Both parts are active production components with stable supply. Implement design verification to confirm mechanical fit and electrical performance in your specific application before full production transition.