Equivalent & Substitute Parts for 3FS-548

Part Overview

The 3FS-548 is a laminated core power transformer manufactured by Tamura, rated at 12VA with a single primary winding (115V) and dual secondary windings (24V parallel or 48V series configuration). This through-hole mounted component is designed for Class 2/3 power supply applications requiring galvanic isolation at 2500Vrms. The part is currently active in production with RoHS compliance and MSL Level 1 rating, indicating suitability for standard storage and handling conditions. Equivalent parts are identified when identical electrical specifications, mechanical mounting compatibility, and isolation ratings are maintained across alternative manufacturers.

Substiute Parts

3FS-548

TamuraIn Stock: 6973FS-548 Datasheet

Current PartRFQ

F48-250

Triad MagneticsIn Stock: 880F48-250 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3FS-548 is limited to components that maintain identical electrical performance across all primary and secondary winding specifications. The substitution logic is based strictly on the following parameters:

Electrical Equivalence Requirements:

• Power rating of 12VA
• Primary voltage of 115V
• Dual secondary windings with parallel 24V/500mA and series 48V/250mA configurations
• Isolation voltage of 2500Vrms
• No center tap configuration

Mechanical Equivalence Requirements:

• Through-hole mounting type
• PC pin termination style
• Laminated core construction

Compliance Requirements:

• RoHS compliance status (RoHS Compliant or ROHS3 Compliant acceptable)
• Active product status

The F48-250 manufactured by Triad Magnetics meets all electrical and mechanical equivalence criteria and is therefore classified as a direct substitute for the 3FS-548.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (3FS-548): The 3FS-548 is the original specified component and remains the preferred choice when available. It is actively manufactured by Tamura, carries RoHS compliance certification, and is stocked in quantity (640 pcs). The through-hole mounting and PC pin termination provide direct PCB integration without adapter requirements.

Equivalent Substitute (F48-250): The F48-250 from Triad Magnetics is electrically and mechanically equivalent to the 3FS-548. All critical electrical parameters match exactly: 12VA power rating, 115V primary, dual secondary windings with 24V/500mA parallel and 48V/250mA series configurations, and 2500Vrms isolation voltage. The component maintains through-hole mounting with PC pin termination, ensuring direct PCB compatibility. Physical dimensions are within acceptable tolerance ranges for standard through-hole applications. The F48-250 carries ROHS3 compliance, which is compatible with RoHS Compliant requirements. Current inventory availability is 851 pcs. The packaging format differs (box versus tube), which does not affect electrical or mechanical performance.

Selection Criteria:

• Use 3FS-548 when Tamura sourcing is preferred or contractually specified
• Use F48-250 when Triad Magnetics sourcing is preferred or when 3FS-548 availability is constrained
• Both parts are suitable for direct substitution in Class 2/3 power supply applications
• No circuit redesign or PCB layout modification is required when switching between these parts

Frequently Asked Questions (FAQ)

Q: Can the F48-250 be used as a direct replacement for the 3FS-548 without PCB modifications?

A: Yes. The F48-250 is electrically and mechanically equivalent. Both components feature identical through-hole mounting, PC pin termination, and physical dimensions within acceptable tolerance ranges. No PCB layout changes are required.

Q: What are the critical parameters that determine substitution eligibility?

A: Substitution eligibility is determined by exact matching of: power rating (12VA), primary voltage (115V), secondary voltage configurations (24V parallel and 48V series), output current ratings (500mA parallel and 250mA series), core type (laminated), mounting type (through-hole), termination style (PC pin), isolation voltage (2500Vrms), and winding configurations (single primary, dual secondary, no center tap).

Q: Are there differences in physical dimensions between the 3FS-548 and F48-250?

A: Minor dimensional differences exist. The 3FS-548 measures 48.50mm L × 41.52mm W × 38.00mm H (seated), while the F48-250 measures 47.63mm L × 39.67mm W × 36.50mm H (seated). These differences are within acceptable tolerance ranges for standard through-hole PCB applications and do not affect functional compatibility.

Q: What is the difference in packaging between these parts?

A: The 3FS-548 is supplied in tube packaging, while the F48-250 is supplied in box packaging. Packaging format does not affect electrical performance or mechanical compatibility. Selection between packaging types depends on inventory management and handling requirements.

Q: Are both parts RoHS compliant?

A: Yes. The 3FS-548 carries RoHS Compliant certification, and the F48-250 carries ROHS3 Compliant certification. Both certifications satisfy RoHS compliance requirements for Class 2/3 power supply applications.

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

A: Both the 3FS-548 and F48-250 are rated for 2500Vrms isolation voltage. This rating specifies the maximum voltage that can be safely applied between primary and secondary windings without risk of electrical breakdown. This parameter is critical for safety-critical applications and must match exactly for substitution.

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

A: Yes. Both transformers feature dual secondary windings that support two operational configurations: parallel connection (24V output at 500mA maximum) or series connection (48V output at 250mA maximum). The configuration is determined by secondary winding connection topology on the PCB.