FS28-700 Equivalent & Substitute Parts Reference

Part Overview

The FS28-700 is a 20VA laminated core power transformer manufactured by Triad Magnetics, designed for through-hole mounting applications. This transformer features dual primary and secondary windings with selectable output configurations: parallel 14V at 1.4A or series 28V at 700mA. The component maintains Active product status and is RoHS3 compliant with 2500Vrms isolation rating.

Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same transformer category, enabling direct replacement in circuit designs without functional degradation.

Substiute Parts

FS28-700

Triad MagneticsIn Stock: 917FS28-700 Datasheet

Current PartRFQ

162H28

Hammond ManufacturingIn Stock: 793162H28 Datasheet

SimilarRFQ

DST-6-28

Signal TransformerIn Stock: 1149DST-6-28 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FS28-700 are qualified based on strict electrical and mechanical parameter equivalence within the laminated core power transformer category. The substitution criteria are:

Electrical Parameters (Must Match Exactly):

• Power rating: 20VA
• Primary voltage options: 115V, 230V
• Secondary voltage configurations: Parallel 14V / Series 28V
• Output current ratings: Parallel 1.4A / Series 700mA
• Winding configuration: Dual primary, dual secondary
• Isolation voltage: 2500Vrms
• Core type: Laminated

Mechanical Parameters (Must Match Exactly):

• Mounting type: Through hole
• Termination style: PC pin
• Physical dimensions: Within 0.1mm tolerance on length and width
• Height seated: Within 0.5mm tolerance

Compliance Parameters (Must Match):

• RoHS3 compliance status
• REACH unaffected status
• ECCN and HTSUS classifications

All identified substitutes meet these criteria and are classified as Active products with current manufacturing status.

Parameter Comparison

Engineering Selection Recommendations

All three transformer models—FS28-700, 162H28, and DST-6-28—are functionally equivalent for direct substitution in through-hole laminated core power transformer applications requiring 20VA capacity with dual primary and secondary windings.

Selection Basis:

All parts maintain Active product status, ensuring current manufacturing availability and supply chain continuity. All three components are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for industrial and commercial electronics applications.

Physical dimensions are within acceptable tolerance ranges for through-hole PCB mounting. The FS28-700 and 162H28 share identical length and width specifications (57.15mm × 47.63mm). The DST-6-28 exhibits minimal dimensional variation (57.20mm × 47.60mm length and width, 36.90mm height), remaining within standard PCB layout tolerances.

Electrical specifications are identical across all three models: 20VA power rating, dual 115V/230V primary configuration, dual secondary windings with 14V parallel and 28V series output options, and 2500Vrms isolation voltage. Output current ratings are equivalent: 1.4A parallel and 700mA series configurations.

Component selection should be based on packaging requirements, inventory availability, and supply chain preferences. The FS28-700 is supplied in box packaging with 864 units in stock. The 162H28 is supplied in bulk packaging with 766 units in stock. The DST-6-28 is supplied in box packaging with 1088 units in stock.

Frequently Asked Questions (FAQ)

Q: Can the 162H28 directly replace the FS28-700 in existing circuit designs?

A: Yes. The 162H28 is electrically and mechanically equivalent to the FS28-700. Both transformers provide identical 20VA power rating, dual 115V/230V primary windings, and dual secondary windings with 14V parallel and 28V series output configurations. Physical dimensions are identical (57.15mm × 47.63mm), and both use through-hole PC pin termination. No circuit modifications are required.

Q: What are the key differences between the FS28-700 and DST-6-28?

A: The FS28-700 and DST-6-28 are electrically identical. Both provide 20VA power, dual primary and secondary windings, and identical voltage and current ratings. Physical dimensions are nearly identical, with the DST-6-28 measuring 57.20mm length (0.05mm longer) and 47.60mm width (0.03mm narrower), and 36.90mm height (0.40mm taller). These dimensional variations remain within standard PCB layout tolerances and do not affect functional compatibility.

Q: Are all three transformers RoHS3 compliant?

A: Yes. The FS28-700, 162H28, and DST-6-28 are all RoHS3 compliant and REACH unaffected, meeting current environmental regulations for electronics manufacturing and distribution.

Q: What is the difference between parallel and series secondary winding configurations?

A: The dual secondary windings can be configured in two ways. Parallel configuration provides 14V output at 1.4A maximum current. Series configuration provides 28V output at 700mA maximum current. Both configurations deliver 20VA power. Circuit design determines which configuration is required.

Q: Does packaging type affect electrical performance?

A: No. The FS28-700 (box packaging) and DST-6-28 (box packaging) are electrically identical to the 162H28 (bulk packaging). Packaging type affects only storage, handling, and inventory management. Electrical specifications and performance characteristics are independent of packaging format.

Q: Can these transformers be used interchangeably in high-reliability applications?

A: All three transformers maintain Active product status with current manufacturing, RoHS3 compliance, and 2500Vrms isolation voltage rating. Selection for high-reliability applications should be based on specific application requirements, supply chain qualification procedures, and manufacturer certifications beyond the parameters provided in this reference.

Q: What mounting considerations apply to these through-hole transformers?

A: All three transformers use through-hole PC pin termination for direct PCB mounting. Physical dimensions are within 0.5mm tolerance across all three models, ensuring compatibility with standard through-hole PCB layouts. Verify PCB hole spacing and mounting pad dimensions match the transformer pin configuration before installation.