F28-040 Equivalent & Substitute Parts Reference

Part Overview

The F28-040 is a laminated core power transformer manufactured by Triad Magnetics, rated at 1.1VA with dual secondary windings. This through-hole mounted component is designed for Class 2/3 applications and is part of the Split Pack™ series. The transformer features a single primary winding (115V) and dual secondary windings capable of parallel (14V, 80mA) or series (28V, 40mA) configurations. The part maintains Active product status with full RoHS3 compliance and 2500Vrms isolation rating. Equivalent substitute parts are identified when identical electrical specifications and mechanical compatibility are maintained across alternative manufacturers.

Substiute Parts

F28-040

Triad MagneticsIn Stock: 783F28-040 Datasheet

Current PartRFQ

164D28

Hammond ManufacturingIn Stock: 1129164D28 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the F28-040 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Primary voltage: 115V
• Secondary voltage configuration: Parallel 14V and Series 28V
• Maximum output current: Parallel 80mA and Series 40mA
• Power rating: 1.1VA
• Winding configuration: Single primary, dual secondary
• Isolation voltage: 2500Vrms

Mechanical Equivalence Requirements:

• Core type: Laminated
• Mounting: Through Hole
• Termination: PC Pin
• Compliance: RoHS3 Compliant

The Hammond Manufacturing 164D28 meets all electrical and mechanical equivalence criteria, establishing it as a direct substitute for the F28-040 in applications requiring identical performance specifications.

Parameter Comparison

Engineering Selection Recommendations

The Hammond Manufacturing 164D28 is electrically and functionally equivalent to the F28-040 across all critical performance parameters. Both components maintain Active product status and full RoHS3 compliance with identical isolation voltage ratings and winding configurations.

Physical Consideration: The 164D28 has a maximum seated height of 33.32mm compared to the F28-040 at 23.80mm. This 9.52mm height difference must be evaluated against available PCB clearance in the target application. Horizontal dimensions (length and width) are equivalent within manufacturing tolerance.

Compliance Equivalence: Both parts carry RoHS3 Compliant status, REACH Unaffected designation, and EAR99 ECCN classification, supporting equivalent use in regulated applications.

Inventory Consideration: The 164D28 is available in higher stock quantity (1055 pcs) compared to the F28-040 (687 pcs), which may influence supply chain decisions.

Frequently Asked Questions (FAQ)

Q: Can the 164D28 replace the F28-040 in all applications?

A: The 164D28 is electrically equivalent to the F28-040 across all specified parameters. However, the increased seated height (33.32mm vs. 23.80mm) requires verification of available vertical clearance on the target PCB. If vertical space is constrained, physical fit must be confirmed before substitution.

Q: Are the secondary winding configurations identical?

A: Yes. Both transformers feature dual secondary windings with identical voltage and current ratings in both parallel (14V, 80mA) and series (28V, 40mA) configurations. Winding polarity and connection methods are equivalent.

Q: Do both parts meet the same isolation and safety standards?

A: Both the F28-040 and 164D28 maintain 2500Vrms isolation voltage and are RoHS3 Compliant. Both carry identical REACH and ECCN classifications, supporting equivalent use in Class 2/3 applications.

Q: What is the significance of the packaging difference (Box vs. Bulk)?

A: The F28-040 is supplied in Box packaging while the 164D28 is supplied in Bulk packaging. This affects handling and storage procedures but does not impact electrical or mechanical performance. Component specifications remain identical regardless of packaging format.

Q: Are the physical dimensions truly equivalent?

A: Length and width dimensions are equivalent (34.93mm x 28.56mm vs. 34.93mm x 28.58mm, within manufacturing tolerance). The seated height differs significantly (33.32mm vs. 23.80mm). PCB layout and clearance requirements must accommodate the taller profile of the 164D28.

Q: Can these transformers be used interchangeably in existing designs?

A: Electrical interchangeability is confirmed. Mechanical interchangeability depends on available vertical clearance. Designs with tight height constraints may require layout modification to accommodate the 164D28's increased seated height.