DST-2-28 Equivalent & Substitute Parts

Part Overview

The DST-2-28 is a laminated core power transformer manufactured by Signal Transformer, 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 active in production with 948 units in stock inventory. Equivalent and substitute parts are identified when electrical specifications, mechanical mounting, and compliance requirements align with the original design parameters.

Substiute Parts

DST-2-28

Signal TransformerIn Stock: 1036DST-2-28 Datasheet

Current PartRFQ

3FD-228

TamuraIn Stock: 10363FD-228 Datasheet

DirectRFQ

FS28-040

Triad MagneticsIn Stock: 874FS28-040 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DST-2-28 are qualified based on the following critical parameters that determine functional equivalence:

• Identical power rating of 1.1VA
• Matching primary voltage inputs (115V, 230V)
• Matching secondary voltage configuration (Parallel 14V, Series 28V)
• Identical output current specifications (Parallel 80mA, Series 40mA)
• Dual primary and dual secondary winding architecture
• Laminated core construction
• Through-hole mounting with PC pin termination
• 2500Vrms isolation voltage rating

The substitute parts FS28-040 (Triad Magnetics) and 3FD-228 (Tamura) meet all electrical and mechanical requirements for direct substitution in applications designed for the DST-2-28.

Parameter Comparison

Engineering Selection Recommendations

All three parts—DST-2-28, FS28-040, and 3FD-228—are active products with current manufacturing status. Selection between these equivalents should be based on:

• Inventory availability and lead time requirements
• Packaging format preference (Box vs. Tube)
• Physical dimensions and height constraints within the application enclosure
• Compliance certifications: DST-2-28 and FS28-040 carry ROHS3 Compliant status, while 3FD-228 carries RoHS Compliant status
• REACH compliance: DST-2-28 and FS28-040 are REACH Unaffected; 3FD-228 status not specified in provided data

All parts share identical electrical specifications and isolation ratings, ensuring functional interchangeability in circuit design.

Frequently Asked Questions (FAQ)

Q: Can FS28-040 or 3FD-228 be used as direct replacements for DST-2-28?

A: Yes. Both substitute parts meet all electrical and mechanical specifications required for the DST-2-28, including power rating, voltage configurations, current ratings, winding architecture, mounting type, and isolation voltage.

Q: What are the physical dimension differences between these parts?

A: DST-2-28 measures 34.90mm L × 28.60mm W × 24.60mm H (seated). FS28-040 measures 34.93mm L × 28.56mm W × 23.80mm H (seated). 3FD-228 measures 35.56mm L × 31.00mm W × 38.00mm H (seated). Verify clearance in your application before substitution.

Q: Are there compliance differences between these parts?

A: DST-2-28 and FS28-040 are both ROHS3 Compliant and REACH Unaffected. 3FD-228 is RoHS Compliant with MSL rating of 1 (Unlimited). All three carry EAR99 ECCN classification and 8504.31.4035 HTSUS code.

Q: What packaging formats are available?

A: DST-2-28 and FS28-040 are supplied in Box packaging. 3FD-228 is supplied in Tube packaging. Select based on your procurement and assembly requirements.

Q: Do all parts have the same winding configuration?

A: Yes. All three parts feature dual primary windings and dual secondary windings with no center tap, enabling identical voltage and current configurations.