FS28-040 Equivalent & Substitute Parts Reference

Part Overview

The FS28-040 is a laminated core power transformer manufactured by Triad Magnetics, rated at 1.1VA with dual primary and secondary windings. This through-hole mounted component is designed for applications requiring 115V or 230V primary input with configurable secondary output of 14V parallel or 28V series. The part is currently in active production status with 794 units in stock.

Equivalent parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits alternative sourcing from qualified manufacturers meeting identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Power Rating (Max)	1.1VA
Primary Voltage	115V, 230V
Secondary Voltage (Full Load)	Parallel 14V, Series 28V
Output Current (Max)	Parallel 80mA, Series 40mA
Core Type	Laminated
Primary Windings	Dual
Secondary Windings	Dual
Center Tap	No
Mounting Type	Through Hole
Termination Style	PC Pin
Isolation Voltage	2500Vrms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the FS28-040 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

Identical power rating: 1.1VA maximum
Matching primary voltage inputs: 115V and 230V dual configuration
Matching secondary voltage outputs: 14V parallel and 28V series configurations
Matching output current specifications: 80mA parallel, 40mA series
Identical isolation voltage: 2500Vrms
Dual primary and dual secondary winding configuration
No center tap requirement

Mechanical Equivalence Requirements:

Through-hole mounting type
PC pin termination style
Laminated core construction

Compliance Requirements:

RoHS compliance (ROHS3 or equivalent)
ECCN classification: EAR99
HTSUS code: 8504.31.4035

The substitute part 3FD-228 manufactured by Tamura meets all electrical and mechanical equivalence criteria, enabling direct functional replacement in circuit designs.

Parameter Comparison

Parameter	FS28-040 (Triad Magnetics)	3FD-228 (Tamura)	Match Status
Power - Max	1.1VA	1.1VA	Equivalent
Voltage - Primary	115V, 230V	115V, 230V	Equivalent
Voltage - Secondary (Full Load)	Parallel 14V, Series 28V	Parallel 14V, Series 28V	Equivalent
Current - Output (Max)	Parallel 80mA, Series 40mA	Parallel 80mA, Series 40mA	Equivalent
Type	Laminated Core	Laminated Core	Equivalent
Primary Winding(s)	Dual	Dual	Equivalent
Secondary Winding(s)	Dual	Dual	Equivalent
Center Tap	No	No	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Termination Style	PC Pin	PC Pin	Equivalent
Voltage - Isolation	2500Vrms	2500Vrms	Equivalent
RoHS Status	ROHS3 Compliant	RoHS Compliant	Equivalent
Size / Dimension (L x W)	34.93mm x 28.56mm	35.56mm x 31.00mm	Minor Variation
Height - Seated (Max)	23.80mm	38.00mm	Variation
Packaging	Box	Tube	Different

Engineering Selection Recommendations

FS28-040 (Triad Magnetics) Selection Criteria:

Primary choice when Split Pack™ series configuration is specified
Preferred for applications with space constraints requiring maximum height of 23.80mm
Optimal when box packaging is required for inventory management
ROHS3 compliance certification required

3FD-228 (Tamura) Selection Criteria:

Direct electrical and mechanical substitute when FS28-040 is unavailable
Suitable for applications where increased height (38.00mm maximum) is acceptable
Applicable when tube packaging meets procurement requirements
RoHS compliance certification meets regulatory requirements
3FD-2xx series provides alternative sourcing from established manufacturer

Both parts carry active product status and maintain equivalent electrical performance across all specified parameters. Selection between these parts should be based on physical space availability, packaging requirements, and supply chain considerations rather than electrical performance differences.

Frequently Asked Questions (FAQ)

Q: Can the 3FD-228 be used as a direct replacement for FS28-040 in existing circuit designs?

A: Yes. The 3FD-228 provides electrical equivalence across all power, voltage, current, and isolation specifications. However, the increased height (38.00mm versus 23.80mm) requires verification of available PCB mounting space before implementation.

Q: What are the dimensional differences between these parts?

A: The FS28-040 measures 34.93mm L × 28.56mm W × 23.80mm H (seated). The 3FD-228 measures 35.56mm L × 31.00mm W × 38.00mm H (seated). Length and width differences are minimal; height difference is significant and must be evaluated for specific applications.

Q: Are both parts RoHS compliant?

A: Yes. The FS28-040 carries ROHS3 compliance certification. The 3FD-228 carries RoHS compliance certification. Both meet regulatory requirements for restricted substance elimination.

Q: What is the difference between Box and Tube packaging?

A: Box packaging (FS28-040) typically provides individual component protection and is preferred for inventory organization. Tube packaging (3FD-228) provides compact storage and is standard for high-volume distribution. Packaging choice does not affect component performance.

Q: Do both parts support dual primary and secondary winding configurations?

A: Yes. Both the FS28-040 and 3FD-228 feature dual primary windings and dual secondary windings, enabling 115V/230V primary input selection and 14V parallel/28V series secondary output configuration.

Q: What isolation voltage rating do these transformers provide?

A: Both parts provide 2500Vrms isolation voltage, meeting high-voltage isolation requirements for safety-critical applications.

Q: Are there any moisture sensitivity considerations?

A: The FS28-040 lists MSL as Not Applicable. The 3FD-228 carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

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