Equivalent & Substitute Parts for Tamura 3FD-224 Laminated Power Transformer

Part Overview

The Tamura 3FD-224 is a laminated core power transformer rated at 1.1VA with dual primary and secondary windings. The transformer supports input voltages of 115V or 230V and provides output configurations of 12V parallel (90mA) or 24V series (45mA). This through-hole mounted component is designed for PC pin termination and maintains 2500Vrms isolation voltage. The part is Active in product status and RoHS Compliant, making it suitable for modern electronic applications requiring regulated power conversion in compact form factors.

Equivalent substitute parts are necessary when the primary manufacturer part becomes unavailable, when alternative packaging formats are required, or when supply chain optimization demands component sourcing from multiple qualified manufacturers while maintaining identical electrical and mechanical performance.

Substiute Parts

3FD-224

TamuraIn Stock: 7843FD-224 Datasheet

Current PartRFQ

DST-2-24

Signal TransformerIn Stock: 1379DST-2-24 Datasheet

DirectRFQ

FS24-045

Triad MagneticsIn Stock: 1193FS24-045 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Tamura 3FD-224 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Identical power rating of 1.1VA
• Matching primary voltage inputs: 115V and 230V
• Matching secondary voltage outputs: 12V parallel and 24V series configurations
• Matching output current specifications: 90mA parallel and 45mA series
• Identical dual primary and dual secondary winding architecture
• Matching isolation voltage of 2500Vrms
• Absence of center tap (matching the original design)

Mechanical Equivalence Requirements:

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

Compliance Requirements:

• Active product status
• RoHS compliance (RoHS3 or equivalent)

The two substitute parts listed—Signal Transformer DST-2-24 and Triad Magnetics FS24-045—meet all electrical and mechanical equivalence criteria. Both parts maintain identical electrical specifications and mounting characteristics while offering alternative packaging and sourcing options.

Parameter Comparison

Engineering Selection Recommendations

All three parts—Tamura 3FD-224, Signal Transformer DST-2-24, and Triad Magnetics FS24-045—are Active products with current manufacturer support and full RoHS compliance certification. Selection between these equivalents should be based on the following factors:

Packaging Format: The Tamura 3FD-224 is supplied in tube packaging, while both substitute parts are supplied in box packaging. Box packaging may offer advantages in automated assembly environments or when component handling requires protective containment.

Physical Dimensions: The Signal Transformer DST-2-24 and Triad Magnetics FS24-045 feature reduced seated heights (24.60mm and 23.80mm respectively) compared to the Tamura 3FD-224 (38.00mm). This dimensional difference is significant for applications with height constraints on printed circuit boards. Both substitute parts also feature slightly reduced length and width dimensions.

Compliance Certifications: The Tamura part carries RoHS Compliant status, while both substitute parts carry ROHS3 Compliant status. The Signal Transformer DST-2-24 and Triad Magnetics FS24-045 additionally carry REACH Unaffected status, providing enhanced regulatory documentation for applications requiring comprehensive environmental compliance tracking.

Inventory Availability: Current stock levels are 760 units for Tamura 3FD-224, 1367 units for Signal Transformer DST-2-24, and 1104 units for Triad Magnetics FS24-045.

Frequently Asked Questions (FAQ)

Q: Can the Signal Transformer DST-2-24 be used as a direct replacement for the Tamura 3FD-224 in existing circuit designs?

A: Yes. The DST-2-24 maintains identical electrical specifications including power rating, primary and secondary voltages, output currents, winding configurations, isolation voltage, and core type. Both parts use through-hole mounting with PC pin termination. The primary difference is reduced physical dimensions and alternative packaging format.

Q: What is the significance of the height difference between the Tamura 3FD-224 (38.00mm) and the substitute parts (approximately 24mm)?

A: The reduced height of the substitute parts may allow for more compact PCB layouts or accommodation in space-constrained applications. However, circuit board layout must be verified to ensure the substitute part's footprint is compatible with existing through-hole pad spacing and clearance requirements.

Q: Are there any electrical performance differences between these three transformer models?

A: No. All three parts are electrically equivalent across all specified parameters: 1.1VA power rating, 115V/230V primary inputs, 12V/24V secondary outputs, 90mA/45mA current ratings, 2500Vrms isolation, and dual winding configurations.

Q: What does ROHS3 Compliant mean compared to RoHS Compliant?

A: ROHS3 refers to the third iteration of the Restriction of Hazardous Substances directive, representing the most current regulatory standard. Both designations indicate compliance with hazardous substance restrictions; ROHS3 represents the latest version of the standard.

Q: Does the packaging format (tube versus box) affect component performance?

A: No. Packaging format affects only handling, storage, and logistics. Electrical and mechanical performance of the transformer is independent of packaging type. Box packaging may offer advantages in automated pick-and-place assembly operations.

Q: Can these transformers be used interchangeably in applications requiring REACH compliance documentation?

A: The Signal Transformer DST-2-24 and Triad Magnetics FS24-045 carry explicit REACH Unaffected status. The Tamura 3FD-224 does not list REACH status in the provided specifications. For applications requiring comprehensive REACH documentation, the substitute parts provide explicit compliance confirmation.

Q: What is the significance of the MSL (Moisture Sensitivity Level) rating?

A: The Tamura 3FD-224 carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling. The substitute parts list MSL as Not Applicable, which is consistent with transformer components that do not require moisture-controlled storage environments.