ST-6-20 Equivalent & Substitute Parts

Part Overview

The ST-6-20 is a laminated core power transformer manufactured by Signal Transformer, rated at 20VA with dual secondary windings. The primary winding operates at 115V, while the secondary windings provide configurable output: 10V at 2A in parallel configuration or 20V at 1A in series configuration. This transformer is designed for through-hole mounting with PC pin termination and maintains 2500Vrms isolation between primary and secondary circuits. The part is currently active in production with ROHS3 compliance and REACH unaffected status. Identifying equivalent substitute parts is necessary to ensure supply chain continuity and provide design flexibility when the primary part becomes unavailable.

Substiute Parts

ST-6-20

Signal TransformerIn Stock: 818ST-6-20 Datasheet

Current PartRFQ

F20-1000

Triad MagneticsIn Stock: 790F20-1000 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ST-6-20 is determined by strict equivalence across the following critical parameters:

• Power Rating: 20VA maximum
• Primary Voltage: 115V input
• Secondary Voltage Configuration: Dual windings capable of 10V parallel / 20V series output
• Output Current Capacity: 2A parallel / 1A series
• Core Construction: Laminated core type
• Winding Configuration: Single primary, dual secondary, no center tap
• Mounting and Termination: Through-hole mounting with PC pin termination
• Isolation Specification: 2500Vrms minimum
• Compliance: ROHS3 compliant, REACH unaffected

Substitute parts must match all parameters listed above. Deviations in any electrical specification, mechanical dimension tolerance, or compliance certification disqualify a part from direct substitution.

Parameter Comparison

Engineering Selection Recommendations

The F20-1000 manufactured by Triad Magnetics is a direct equivalent substitute for the ST-6-20. Both parts are active products with identical electrical specifications, core construction, winding configuration, and mounting characteristics. Mechanical dimensions are within acceptable tolerance ranges, with maximum height variation of 0.40mm. Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment in applications requiring these certifications. Selection between the two parts may be based on availability, lead time, or procurement requirements, as electrical and mechanical performance are equivalent.

Frequently Asked Questions (FAQ)

Q: Can the F20-1000 be used as a direct replacement for the ST-6-20 in existing designs?

A: Yes. The F20-1000 meets all electrical and mechanical specifications of the ST-6-20, including power rating, voltage configuration, current capacity, isolation voltage, mounting type, and termination style. No circuit modifications are required.

Q: Are there dimensional differences between these parts?

A: Dimensional variations are minimal. Length differs by 0.05mm, width by 0.03mm, and height by 0.40mm. These tolerances are within standard PCB layout and mechanical assembly margins for through-hole mounted components.

Q: Do both parts support the same secondary voltage configurations?

A: Yes. Both the ST-6-20 and F20-1000 provide dual secondary windings capable of 10V at 2A in parallel configuration or 20V at 1A in series configuration.

Q: Are compliance certifications identical?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS code 8504.31.4035.

Q: What is the isolation voltage rating for both transformers?

A: Both parts maintain 2500Vrms isolation between primary and secondary circuits.

Q: Are there any differences in termination or mounting?

A: No. Both parts use PC pin termination and through-hole mounting, ensuring identical PCB integration.