F28-420 Equivalent & Substitute Parts Reference

Part Overview

The F28-420 is a laminated core power transformer manufactured by Triad Magnetics, rated at 12VA with dual secondary windings. This through-hole mounted component is designed for Class 2/3 applications and features configurable output voltage in parallel (14V) or series (28V) modes. The part is currently active in production with ROHS3 compliance and remains in stock inventory. Equivalent substitute parts are identified when identical electrical specifications and mechanical compatibility are maintained across alternative manufacturers.

Substiute Parts

F28-420

Triad MagneticsIn Stock: 896F28-420 Datasheet

Current PartRFQ

164G28

Hammond ManufacturingIn Stock: 1037164G28 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the F28-420 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters (Must Match Exactly):

• Power rating: 12VA
• Primary voltage: 115V
• Secondary voltage configuration: Parallel 14V, Series 28V
• Output current capacity: Parallel 840mA, Series 420mA
• Winding configuration: Single primary, dual secondary
• Isolation voltage: 2500Vrms
• Core type: Laminated

Mechanical Parameters (Must Match Exactly):

• Mounting type: Through Hole
• Termination style: PC Pin
• Footprint dimensions: 47.63mm L x 39.67mm W
• Height compatibility: Maximum seated height tolerance

Compliance Parameters:

• RoHS3 compliance required
• REACH unaffected status required
• Product status: Active

The Hammond Manufacturing 164G28 meets all electrical specifications and mechanical mounting requirements, with minor height variation within acceptable tolerance for through-hole applications.

Parameter Comparison

Engineering Selection Recommendations

Both the F28-420 and 164G28 are active production components with identical electrical specifications and mechanical compatibility. Selection between these parts is based on availability, packaging format, and supply chain requirements rather than technical performance differences.

F28-420 (Triad Magnetics):

• Packaged in Box format
• Current inventory: 794 pieces
• Series designation: Split Pack™, Class 2/3, F
• Seated height: 36.50mm

164G28 (Hammond Manufacturing):

• Packaged in Bulk format
• Current inventory: 948 pieces
• Series designation: 164
• Seated height: 38.10mm (1.60mm taller)

The 1.60mm height difference between parts does not affect electrical performance or standard through-hole PCB mounting applications. Both components maintain ROHS3 compliance and REACH unaffected status. Selection should be based on procurement lead time, packaging requirements, and inventory availability at the time of component sourcing.

Frequently Asked Questions (FAQ)

Q: Can the 164G28 be used as a direct replacement for the F28-420 in existing designs?

A: Yes. The 164G28 provides identical electrical performance and mechanical compatibility. All voltage ratings, current capacities, winding configurations, and isolation specifications match exactly. The through-hole footprint and PC pin termination are identical. The 1.60mm height difference is within acceptable tolerance for standard PCB applications.

Q: What are the key parameters that determine substitution eligibility for this transformer?

A: Substitution eligibility is determined by: 12VA power rating, 115V primary voltage, dual secondary windings with 14V parallel and 28V series output, 840mA parallel and 420mA series current capacity, 2500Vrms isolation voltage, laminated core type, through-hole mounting, PC pin termination, and identical footprint dimensions of 47.63mm x 39.67mm.

Q: Are there compliance differences between the F28-420 and 164G28?

A: No. Both parts are ROHS3 compliant and REACH unaffected. Both maintain active product status with equivalent regulatory standing.

Q: What is the difference between Box and Bulk packaging for these transformers?

A: Packaging format affects order quantities and handling but does not impact component performance or specifications. Box packaging (F28-420) typically accommodates smaller order quantities, while Bulk packaging (164G28) is suited for higher-volume procurement.

Q: Can these transformers be configured for both 14V and 28V output?

A: Yes. Both the F28-420 and 164G28 feature dual secondary windings that allow configuration in parallel mode (14V at 840mA) or series mode (28V at 420mA) depending on circuit design requirements.

Q: What is the isolation voltage specification and why is it important?

A: Both transformers provide 2500Vrms isolation voltage between primary and secondary windings. This specification ensures safe electrical isolation for Class 2/3 applications and defines the maximum voltage differential that can be safely applied across the transformer windings.