DST4-12B6 Equivalent & Substitute Parts

Part Overview

The DST4-12B6 is a 6VA laminated core power transformer manufactured by Pulse Electronics, designed for through-hole mounting applications. This split bobbin plug-in transformer features dual primary and secondary windings, supporting both 115V and 230V primary inputs with configurable secondary outputs of 6.3V parallel or 12.6V series. The part is actively produced and RoHS compliant, making it suitable for industrial and commercial electronic equipment requiring isolated power conversion.

Substitute parts become necessary due to inventory availability, lead time constraints, manufacturing discontinuation, or regional supplier preferences while maintaining identical electrical and mechanical performance specifications.

Substiute Parts

DST4-12B6

Pulse ElectronicsIn Stock: 793DST4-12B6 Datasheet

Current PartRFQ

DST-4-12

Signal TransformerIn Stock: 4316DST-4-12 Datasheet

DirectRFQ

3FD-412

TamuraIn Stock: 19623FD-412 Datasheet

SimilarRFQ

FS12-500

Triad MagneticsIn Stock: 1025FS12-500 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DST4-12B6 are classified based on strict electrical and mechanical compatibility. All substitute candidates must match the following critical parameters:

• Power rating: 6VA
• Primary voltage inputs: 115V and 230V
• Secondary voltage configuration: Parallel 6.3V / Series 12.6V
• Output current capability: Parallel 1A / Series 500mA
• Core type: Laminated
• Winding configuration: Dual primary, dual secondary
• Mounting: Through hole with PC pin termination
• Isolation voltage: 2500Vrms
• Physical form factor: Comparable dimensions and height

All identified substitutes meet these criteria and are classified as direct equivalents. Dimensional variations within manufacturing tolerances do not affect functional interchangeability in standard through-hole PCB applications.

Parameter Comparison

Engineering Selection Recommendations

All four transformers—DST4-12B6, DST-4-12, 3FD-412, and FS12-500—are functionally equivalent and interchangeable based on electrical specifications and core parameters. Selection among these parts should be based on the following factors:

Compliance and Regulatory Status: DST-4-12 and FS12-500 carry ROHS3 certification, representing the most current RoHS standard. DST4-12B6 and 3FD-412 maintain RoHS compliance. All parts are REACH unaffected or unspecified, meeting environmental regulations for industrial applications.

Physical Dimensions: DST4-12B6, DST-4-12, and FS12-500 share nearly identical dimensions (approximately 41.3–41.4mm length, 33.3mm width and height), ensuring direct PCB footprint compatibility. The 3FD-412 exhibits slightly larger width (34.83mm) and height (38.00mm), requiring verification of available PCB space before substitution.

Availability and Packaging: DST-4-12 offers the highest inventory (4267 units), followed by 3FD-412 (1933 units), FS12-500 (937 units), and DST4-12B6 (708 units). Packaging formats vary: DST-4-12 and FS12-500 are supplied in boxes, 3FD-412 in tubes, and DST4-12B6 in standard packaging.

Product Status: All parts maintain active production status, ensuring long-term availability and consistent quality.

Frequently Asked Questions (FAQ)

Q: Can DST-4-12 directly replace DST4-12B6 in existing designs?

A: Yes. The DST-4-12 is a direct electrical and mechanical equivalent. Both transformers share identical voltage ratings, current capabilities, winding configurations, isolation voltage, and through-hole PC pin termination. Dimensional differences are negligible (41.30mm vs. 41.40mm length), presenting no functional impact in standard PCB layouts.

Q: What are the dimensional constraints when substituting with 3FD-412?

A: The 3FD-412 maintains the same length (41.50mm) and width (34.83mm) as the original, but exhibits increased height (38.00mm compared to 33.27mm). This 4.73mm height difference requires verification that the PCB layout and surrounding components provide adequate clearance. Electrical performance remains identical.

Q: Are there compliance differences between substitute options?

A: DST-4-12 and FS12-500 are certified to ROHS3, the current RoHS standard. DST4-12B6 and 3FD-412 meet RoHS compliance. All parts are REACH unaffected or unspecified. For applications requiring the latest regulatory certifications, DST-4-12 or FS12-500 are preferred. For existing designs already qualified to RoHS, all options remain compliant.

Q: Which substitute offers the best lead time and availability?

A: DST-4-12 (Signal Transformer) provides the highest inventory at 4267 units, offering the shortest lead times. FS12-500 (Triad Magnetics) and 3FD-412 (Tamura) provide secondary options with 937 and 1933 units respectively.

Q: Can FS12-500 be used as a drop-in replacement?

A: Yes. FS12-500 is dimensionally and electrically equivalent to DST4-12B6, with nearly identical length (41.28mm), width (33.32mm), and height (33.32mm). It is supplied in box packaging and carries ROHS3 certification, making it suitable for direct substitution in all applications.

Q: What packaging formats are available for each substitute?

A: DST4-12B6 uses standard packaging, DST-4-12 and FS12-500 are supplied in boxes, and 3FD-412 is packaged in tubes. Packaging selection may affect handling, storage, and integration into automated assembly processes.