ST-4-16 Equivalent & Substitute Parts

Part Overview

The ST-4-16 is a laminated core power transformer manufactured by Signal Transformer, rated at 6VA with a 115V primary voltage and dual secondary windings capable of 8V parallel or 16V series output. This through-hole mounted component is designed for applications requiring isolated AC power conversion with dual voltage flexibility. The part is currently active in production with ROHS3 compliance and 2500Vrms isolation rating. Substitute parts are identified when equivalent electrical specifications, mechanical dimensions, mounting characteristics, and regulatory compliance are maintained across alternative manufacturers.

Substiute Parts

ST-4-16

Signal TransformerIn Stock: 732ST-4-16 Datasheet

Current PartRFQ

F16-400

Triad MagneticsIn Stock: 962F16-400 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ST-4-16 is determined by strict equivalence across the following critical parameters:

• Electrical specifications: Primary voltage (115V), secondary voltage configuration (8V parallel / 16V series), output current ratings (800mA parallel / 400mA series), and power rating (6VA)
• Core construction: Laminated core type
• Mounting and termination: Through-hole mounting with PC pin termination
• Isolation and safety: 2500Vrms isolation voltage rating
• Mechanical compatibility: Physical dimensions and height within acceptable tolerance
• Regulatory compliance: ROHS3 compliance and equivalent certifications

The F16-400 manufactured by Triad Magnetics meets all specified criteria and is classified as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the ST-4-16 and F16-400 are active production components with identical electrical and mechanical specifications. Selection between these parts may be based on availability, lead time, or supply chain requirements. Both parts maintain ROHS3 compliance and equivalent regulatory certifications (EAR99, HTSUS codes). Dimensional tolerances between the two units are negligible (±0.02mm variance), ensuring interchangeability in through-hole PCB applications. No performance degradation or functional compromise occurs when substituting between these parts in equivalent circuit applications.

Frequently Asked Questions (FAQ)

Q: Can the F16-400 be used as a direct replacement for the ST-4-16 in existing designs?

A: Yes. Both transformers share identical electrical ratings (6VA, 115V primary, 8V/16V secondary), core construction (laminated), mounting type (through-hole), and termination style (PC pin). Dimensional differences are within 0.02mm, presenting no compatibility issues for PCB layouts.

Q: Are there any differences in isolation voltage or safety ratings between these parts?

A: No. Both the ST-4-16 and F16-400 are rated at 2500Vrms isolation voltage and maintain equivalent ROHS3 compliance and regulatory certifications.

Q: What determines whether a transformer can substitute for the ST-4-16?

A: Substitution requires matching specifications across power rating (6VA), primary voltage (115V), secondary voltage configuration (8V parallel / 16V series), output current ratings (800mA parallel / 400mA series), core type (laminated), mounting method (through-hole), termination style (PC pin), isolation voltage (2500Vrms), and physical dimensions within acceptable tolerance.

Q: Are there any packaging or series differences between these transformers?

A: The F16-400 is part of Triad Magnetics' Split Pack™ series, while the ST-4-16 belongs to Signal Transformer's ST series. These designations reflect manufacturer product lines but do not affect electrical or mechanical compatibility.

Q: What should be verified when substituting between these parts in production?

A: Verify PCB footprint compatibility (through-hole spacing and pin configuration), confirm secondary winding configuration requirements (parallel 8V or series 16V operation), and validate that both parts are sourced from authorized distributors to ensure authenticity and compliance documentation.