FP20-125 Equivalent & Substitute Parts Reference

Part Overview

The FP20-125 is a laminated core power transformer manufactured by Triad Magnetics, rated at 2.5VA with dual primary and secondary windings. This through-hole mounted component is designed for applications requiring isolated AC power conversion with selectable output configurations (parallel or series connection). The part maintains Active product status with full RoHS3 compliance and is currently in stock with 632 units available.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter range. Alternative sources become necessary for supply chain continuity, extended lead time mitigation, or inventory optimization in production environments.

Substiute Parts

FP20-125

Triad MagneticsIn Stock: 731FP20-125 Datasheet

Current PartRFQ

3FL20-125

TamuraIn Stock: 15683FL20-125 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The FP20-125 and 3FL20-125 are classified as direct substitutes based on the following electrical and mechanical equivalence criteria:

Matching Parameters (Substitution Basis):

• Identical power rating: 2.5VA
• Identical primary voltage options: 115V, 230V
• Identical secondary voltage configuration: Parallel 10V / Series 20V
• Identical output current ratings: Parallel 250mA / Series 125mA
• Identical winding configuration: Dual primary, dual secondary
• Identical core type: Laminated
• Identical mounting type: Through Hole
• Identical termination style: PC Pin
• Identical regulatory compliance: ROHS3 Compliant

Allowable Variations:

• Physical dimensions within tolerance (length, width, height)
• Isolation voltage rating (2000Vrms vs. 1500Vrms) — substitute meets minimum isolation requirement
• Packaging format (Box vs. Bulk)
• Manufacturer series designation (Flat Pack™ vs. 3FL)

These substitutes maintain functional equivalence for circuit-level applications where the specified electrical parameters define component selection criteria.

Parameter Comparison

Engineering Selection Recommendations

FP20-125 (Triad Magnetics) is the primary specification. Selection of this part is appropriate when:

• Original design validation has been completed with this manufacturer
• Triad Magnetics supply chain availability is confirmed
• Higher isolation voltage rating (2000Vrms) is required for specific application safety margins

3FL20-125 (Tamura) is an acceptable substitute when:

• Supply continuity from primary manufacturer is interrupted
• Inventory requirements exceed primary manufacturer availability (1534 units in stock vs. 632 units)
• Application isolation voltage requirement is satisfied by 1500Vrms rating
• PCB layout accommodates dimensional tolerance variations (maximum 0.3mm variance in length/width, 0.29mm in height)
• Both parts maintain identical electrical performance and RoHS3 compliance

No additional testing or design modification is required for substitution, provided the application circuit operates within the specified electrical parameters of both transformers.

Frequently Asked Questions (FAQ)

Q: Can the 3FL20-125 be used as a direct replacement for the FP20-125 in existing designs?

A: Yes. Both transformers provide identical electrical performance across all specified parameters: 2.5VA power rating, dual 115V/230V primary inputs, dual 10V/20V secondary outputs, and 250mA/125mA current ratings. Physical dimensions are within manufacturing tolerance. No circuit redesign is required.

Q: What is the difference in isolation voltage between these parts?

A: The FP20-125 provides 2000Vrms isolation, while the 3FL20-125 provides 1500Vrms isolation. Both ratings exceed standard safety isolation requirements for low-voltage applications. Selection depends on application-specific isolation specifications. If your design requires 2000Vrms isolation, the FP20-125 is the appropriate choice.

Q: Are there packaging differences between these substitutes?

A: Yes. The FP20-125 is supplied in Box packaging, while the 3FL20-125 is supplied in Bulk packaging. This affects handling and storage procedures but does not impact electrical or mechanical performance. Verify packaging requirements for your procurement and assembly processes.

Q: Do both parts have the same physical footprint?

A: Dimensions are nearly identical with minor tolerance variations. FP20-125: 47.63mm L × 39.67mm W × 16.51mm H (seated). 3FL20-125: 47.60mm L × 39.60mm W × 16.80mm H (seated). Maximum variance is 0.3mm in length/width and 0.29mm in height. Verify PCB layout clearances accommodate the 3FL20-125 height specification if substituting.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the FP20-125 and 3FL20-125 are ROHS3 Compliant, meeting current environmental and hazardous substance restrictions for electronic components.

Q: Which part should I specify for new designs?

A: Specify the FP20-125 (Triad Magnetics) as the primary component for new designs. Use the 3FL20-125 (Tamura) as an approved substitute only when supply constraints or inventory requirements necessitate alternative sourcing.