Equivalent & Substitute Parts for Tamura 3FD-424 Laminated Power Transformer

Part Overview

The Tamura 3FD-424 is a 6VA laminated core power transformer designed for through-hole mounting applications. This transformer features dual primary windings (115V, 230V) and dual secondary windings (parallel 12V/500mA or series 24V/250mA), with 2500Vrms isolation voltage. The part is currently in active production status with RoHS compliance certification. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required for design flexibility, supply chain alternatives, or inventory optimization.

Substiute Parts

3FD-424

TamuraIn Stock: 9993FD-424 Datasheet

Current PartRFQ

DST-4-24

Signal TransformerIn Stock: 2243DST-4-24 Datasheet

DirectRFQ

FS24-250

Triad MagneticsIn Stock: 1615FS24-250 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Tamura 3FD-424 are qualified based on the following electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Identical power rating: 6VA
• Matching primary voltage configuration: 115V, 230V dual winding
• Matching secondary voltage configuration: Parallel 12V / Series 24V dual winding
• Identical maximum output current: Parallel 500mA / Series 250mA
• Identical isolation voltage: 2500Vrms
• Identical core type: Laminated

Mechanical Compatibility Criteria:

• Through-hole mounting type
• PC pin termination style
• Physical dimensions within acceptable tolerance for PCB footprint compatibility

Compliance Criteria:

• Active product status
• RoHS or ROHS3 compliance

The following parts meet all substitution criteria: DST-4-24 (Signal Transformer) and FS24-250 (Triad Magnetics).

Parameter Comparison

Engineering Selection Recommendations

All three transformers—Tamura 3FD-424, Signal Transformer DST-4-24, and Triad Magnetics FS24-250—are electrically equivalent and mechanically compatible for through-hole PCB applications. Selection between these parts is based on the following factors:

Product Availability: Inventory levels vary by manufacturer. Tamura 3FD-424 has 973 units in stock, Signal Transformer DST-4-24 has 2146 units, and Triad Magnetics FS24-250 has 1532 units available.

Compliance Status: All parts meet RoHS requirements. Tamura 3FD-424 carries RoHS Compliant certification, while Signal Transformer DST-4-24 and Triad Magnetics FS24-250 carry ROHS3 Compliant certification. Signal Transformer DST-4-24 and Triad Magnetics FS24-250 are also REACH Unaffected.

Physical Dimensions: The Tamura 3FD-424 has a seated height of 38.00mm, while both substitute parts have a seated height of approximately 33.30mm. This dimensional difference must be evaluated against PCB layout constraints and available vertical clearance in the application.

Packaging Consideration: Tamura 3FD-424 is supplied in tube packaging, while Signal Transformer DST-4-24 and Triad Magnetics FS24-250 are supplied in box packaging. This affects handling, storage, and assembly line integration.

Frequently Asked Questions (FAQ)

Q: Can DST-4-24 and FS24-250 be used interchangeably with the Tamura 3FD-424?

A: Yes. All three transformers have identical electrical specifications: 6VA power rating, dual 115V/230V primary windings, dual 12V/24V secondary windings, 500mA/250mA output current capability, and 2500Vrms isolation voltage. All feature laminated cores, through-hole mounting, and PC pin termination.

Q: What is the primary difference between these substitute parts?

A: The main differences are physical dimensions and packaging format. The Tamura 3FD-424 has a maximum seated height of 38.00mm and is packaged in tubes. The Signal Transformer DST-4-24 and Triad Magnetics FS24-250 both have seated heights of approximately 33.30mm and are packaged in boxes. Length and width dimensions are also slightly different across all three parts.

Q: Does the height difference affect PCB compatibility?

A: The Tamura 3FD-424 is approximately 4.7mm taller than the substitute parts. PCB layout must accommodate the maximum seated height of the selected transformer. If vertical clearance is limited, the Signal Transformer DST-4-24 or Triad Magnetics FS24-250 may be preferred.

Q: Are there compliance differences between these parts?

A: All parts are RoHS compliant. The Tamura 3FD-424 carries RoHS Compliant certification. The Signal Transformer DST-4-24 and Triad Magnetics FS24-250 carry ROHS3 Compliant certification and are REACH Unaffected, providing additional regulatory coverage for certain applications.

Q: Which part should be selected for new designs?

A: For new designs, any of the three parts is electrically and mechanically suitable. Selection should be based on: (1) available inventory for production volume requirements, (2) physical height constraints in the PCB layout, (3) packaging format compatibility with assembly processes, and (4) regulatory compliance requirements specific to the end application.

Q: Can these transformers be mixed in the same production batch?

A: Electrical interchangeability is confirmed. However, physical dimension differences (particularly height) must be evaluated to ensure all units fit within the same PCB footprint and clearance envelope. Mixing should only occur if dimensional compatibility is verified for the specific application.