Equivalent & Substitute Parts for Tamura 3FD-220 Laminated Power Transformer

Part Overview

The Tamura 3FD-220 is an active laminated core power transformer rated at 1.1VA with dual primary and secondary windings. This through-hole mounted component is designed for applications requiring 115V or 230V primary input with configurable secondary output of 10V (parallel) or 20V (series). The transformer features 2500Vrms isolation and is RoHS compliant with MSL 1 rating, indicating unlimited moisture sensitivity tolerance.

Equivalent substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits alternative sourcing while maintaining electrical and mechanical compatibility within specified parameters.

Substiute Parts

3FD-220

TamuraIn Stock: 11953FD-220 Datasheet

Current PartRFQ

FS20-055

Triad MagneticsIn Stock: 945FS20-055 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Tamura 3FD-220 is determined by strict equivalence across all electrical parameters and core mechanical specifications. The following criteria establish valid substitution:

Electrical Equivalence Requirements:

• Power rating of 1.1VA
• Primary voltage options of 115V and 230V
• Secondary voltage configuration of 10V (parallel) and 20V (series)
• Output current capacity of 110mA (parallel) and 55mA (series)
• Laminated core construction
• Dual primary and dual secondary winding topology
• 2500Vrms isolation voltage rating
• No center tap configuration

Mechanical Equivalence Requirements:

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

Compliance Considerations:

• RoHS compliance status (RoHS 2 or RoHS 3)
• ECCN and HTSUS classification alignment
• Product active status

The Triad Magnetics FS20-055 meets all electrical equivalence criteria and maintains mechanical compatibility through identical mounting and termination specifications. Minor dimensional variations (34.93mm L x 28.56mm W x 23.80mm H versus 35.56mm L x 31.00mm W x 25.40mm H) remain within acceptable tolerance for through-hole PCB applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (Tamura 3FD-220): The Tamura 3FD-220 is the specified component with active product status and confirmed inventory of 1177 pieces. This part maintains RoHS compliance and MSL 1 rating, suitable for applications with no moisture sensitivity constraints. Selection of this part is appropriate when supply availability is confirmed and no design flexibility exists.

Substitute Part Selection (Triad Magnetics FS20-055): The Triad Magnetics FS20-055 is a direct electrical equivalent with identical power rating, voltage configuration, current capacity, and isolation specifications. This part maintains active product status with 892 pieces in inventory and ROHS3 compliance. The FS20-055 is suitable for substitution when:

• Tamura 3FD-220 availability is constrained
• Design permits alternative manufacturer sourcing
• PCB layout accommodates dimensional variations within 2.44mm width and 1.60mm height tolerance
• Packaging format (box versus tube) is acceptable for assembly operations

Both parts share identical ECCN and HTSUS classifications, ensuring regulatory equivalence for export and tariff purposes.

Frequently Asked Questions (FAQ)

Q: Can the Triad Magnetics FS20-055 be used as a direct replacement for the Tamura 3FD-220 in existing designs?

A: Yes, the FS20-055 is electrically equivalent across all critical parameters: 1.1VA power rating, 115V/230V primary input, 10V/20V secondary output, 110mA/55mA current capacity, and 2500Vrms isolation. Both parts use identical through-hole PC pin termination. Physical dimensions differ by less than 2.5mm in any direction, which is typically acceptable for through-hole PCB layouts. Verify PCB footprint clearance before implementation.

Q: What are the key electrical parameters that must match for transformer substitution?

A: Substitution requires exact equivalence in: power rating (1.1VA), primary voltage options (115V and 230V), secondary voltage configuration (10V parallel and 20V series), output current ratings (110mA parallel and 55mA series), core type (laminated), winding configuration (dual primary and dual secondary), and isolation voltage (2500Vrms). Any deviation in these parameters disqualifies a part from substitution.

Q: Are there compliance differences between the Tamura and Triad Magnetics parts?

A: Both parts are RoHS compliant; Tamura carries RoHS 2 compliance while Triad Magnetics carries ROHS3 compliance. ROHS3 represents a more recent standard iteration. Both parts share identical ECCN (EAR99) and HTSUS (8504.31.4035) classifications. The Tamura part specifies MSL 1 (unlimited moisture sensitivity), while the Triad Magnetics part lists MSL as not applicable. For moisture-sensitive applications, the Tamura specification is more conservative.

Q: What packaging differences exist between these parts?

A: The Tamura 3FD-220 is supplied in tube packaging, while the Triad Magnetics FS20-055 is supplied in box packaging. This difference affects only receiving, storage, and assembly handling procedures and does not impact electrical or mechanical performance.

Q: Are dimensional differences significant for PCB integration?

A: The FS20-055 is slightly smaller: 34.93mm L (versus 35.56mm), 28.56mm W (versus 31.00mm), and 23.80mm H (versus 25.40mm). Maximum differences are 0.63mm in length, 2.44mm in width, and 1.60mm in height. These variations are within typical through-hole PCB tolerance and do not require design modification for standard applications. Verify specific PCB layout constraints for space-critical designs.

Q: Can these transformers be used interchangeably in series or parallel winding configurations?

A: Yes. Both the Tamura 3FD-220 and Triad Magnetics FS20-055 feature dual primary and dual secondary windings with identical voltage and current ratings in both series and parallel configurations. The 10V/110mA parallel output and 20V/55mA series output are equivalent across both parts.

Q: What is the isolation voltage rating and why is it important?

A: Both parts provide 2500Vrms isolation voltage between primary and secondary windings. This rating defines the maximum voltage differential that can be safely applied across the isolation barrier without risk of breakdown. This specification is critical for safety-critical applications and must not be compromised during substitution.