Equivalent & Substitute Parts for 3FS-336

Part Overview

The 3FS-336 is a laminated core power transformer manufactured by Tamura, rated at 2.4VA with through-hole mounting and PC pin termination. This transformer features a single primary winding (115V) and dual secondary windings capable of parallel (18V, 130mA) or series (36V, 65mA) configuration. The part is Active in product status and RoHS Compliant, making it suitable for industrial and commercial power supply applications requiring galvanic isolation at 2500Vrms.

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

Substiute Parts

3FS-336

TamuraIn Stock: 11913FS-336 Datasheet

Current PartRFQ

ST-3-36

Signal TransformerIn Stock: 2071ST-3-36 Datasheet

DirectRFQ

F36-65

Triad MagneticsIn Stock: 1248F36-65 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3FS-336 are classified into two categories based on electrical and mechanical parameter alignment:

Direct Manufacturer Substitute (ST-3-36): This Signal Transformer part maintains identical electrical specifications across all critical parameters: primary voltage (115V), secondary voltages (parallel 18V, series 36V), output currents (parallel 130mA, series 65mA), power rating (2.4VA), isolation voltage (2500Vrms), winding configuration (single primary, dual secondary, no center tap), mounting type (through hole), and termination style (PC pin). Physical dimensions vary slightly (34.90mm L × 28.60mm W × 30.80mm H seated versus 35.56mm L × 31.00mm W × 32.10mm H seated), remaining within acceptable mechanical tolerances for through-hole PCB mounting. Both parts are laminated core transformers with Active product status and RoHS compliance.

Similar Manufacturer Substitute (F36-65): This Triad Magnetics part matches all electrical specifications identically with one exception: the power rating is 2.5VA versus 2.4VA for the 3FS-336. This represents a 4.2% increase in power capacity, which is acceptable for substitution purposes as the part exceeds the minimum requirement. All other parameters—primary voltage (115V), secondary voltages (parallel 18V, series 36V), output currents (parallel 130mA, series 65mA), isolation voltage (2500Vrms), winding configuration, mounting type, and termination style—are identical. Physical dimensions are comparable (34.93mm L × 28.58mm W × 30.15mm H seated). Both parts are laminated core transformers with Active product status and ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

ST-3-36 (Signal Transformer): This part is the primary direct substitute for the 3FS-336. All electrical parameters match exactly, and physical dimensions are within acceptable mechanical tolerances for through-hole PCB applications. Both parts maintain Active product status and meet RoHS compliance requirements. The ST-3-36 is suitable for direct replacement in existing designs without circuit modification. Current inventory (2031 pcs) provides adequate supply availability.

F36-65 (Triad Magnetics): This part is a secondary substitute option with identical electrical specifications except for a 2.5VA power rating, which exceeds the 3FS-336 requirement of 2.4VA. The additional 0.1VA capacity does not introduce incompatibility and provides operational margin. Physical dimensions are comparable to the ST-3-36. Both parts maintain Active product status and ROHS3 compliance. The F36-65 is suitable for replacement in applications where the increased power capacity is acceptable. Current inventory (1202 pcs) supports component availability.

Both substitute parts are classified as laminated core transformers with identical winding configurations (single primary, dual secondary, no center tap), isolation voltage (2500Vrms), and mounting specifications (through hole, PC pin termination). Selection between ST-3-36 and F36-65 may be based on inventory availability, lead time, or design margin requirements.

Frequently Asked Questions (FAQ)

Q: Can the ST-3-36 be used as a direct replacement for the 3FS-336 without PCB layout modifications?

A: Yes. The ST-3-36 maintains identical electrical specifications and through-hole PC pin termination. Physical dimensions (34.90mm L × 28.60mm W × 30.80mm H seated) are slightly smaller than the 3FS-336 (35.56mm L × 31.00mm W × 32.10mm H seated), which is compatible with existing through-hole footprints. No circuit modifications are required.

Q: What is the difference between the 3FS-336 and F36-65 in terms of power capacity?

A: The 3FS-336 is rated at 2.4VA, while the F36-65 is rated at 2.5VA. This represents a 4.2% increase in maximum power capacity. All other electrical parameters—primary voltage (115V), secondary voltages (parallel 18V, series 36V), output currents (parallel 130mA, series 65mA), and isolation voltage (2500Vrms)—are identical. The higher power rating of the F36-65 does not create incompatibility and may provide additional operational margin.

Q: Are there any compliance differences between the three parts?

A: The 3FS-336 is RoHS Compliant. Both substitute parts (ST-3-36 and F36-65) are ROHS3 Compliant, which represents a more recent compliance standard. All three parts are classified as Active products. The ECCN and HTSUS codes are identical across all parts (EAR99 and 8504.31.4035, respectively).

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

A: The following parameters must match exactly: primary voltage (115V), secondary voltages (parallel 18V, series 36V), output currents (parallel 130mA, series 65mA), isolation voltage (2500Vrms), transformer type (laminated core), winding configuration (single primary, dual secondary, no center tap), mounting type (through hole), and termination style (PC pin). The power rating must meet or exceed 2.4VA.

Q: Can the F36-65 be used in applications requiring the exact 2.4VA specification?

A: Yes. The F36-65 is rated at 2.5VA, which exceeds the 2.4VA requirement of the 3FS-336. In engineering applications, a component rated above the specified requirement is acceptable and does not introduce incompatibility. The additional 0.1VA capacity provides operational margin without adverse effects.

Q: Are the physical dimensions of the substitute parts compatible with existing PCB layouts designed for the 3FS-336?

A: The ST-3-36 and F36-65 have slightly smaller physical dimensions than the 3FS-336. The 3FS-336 measures 35.56mm L × 31.00mm W × 32.10mm H (seated), while the ST-3-36 measures 34.90mm L × 28.60mm W × 30.80mm H (seated), and the F36-65 measures 34.93mm L × 28.58mm W × 30.15mm H (seated). These dimensional differences are within acceptable tolerances for through-hole mounting and do not require PCB layout modifications.

Q: What is the packaging difference between the main part and substitute parts?

A: The 3FS-336 is supplied in Tube packaging, while both ST-3-36 and F36-65 are supplied in Box packaging. This difference affects logistics and storage but does not impact electrical or mechanical compatibility. Component selection should account for packaging requirements in procurement and assembly workflows.

Q: Are all three parts suitable for Class 2/3 applications?

A: The F36-65 is explicitly designated as Class 2/3 compliant. The 3FS-336 and ST-3-36 specifications do not explicitly reference Class 2/3 designation in the provided data. For applications requiring Class 2/3 certification, the F36-65 is the confirmed option. Verification of Class 2/3 compliance for the 3FS-336 and ST-3-36 should be obtained from manufacturer datasheets if this certification is required.