DST5-20B15 Equivalent & Substitute Parts

Part Overview

The DST5-20B15 is a 12VA 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 with selectable voltage configurations (115V or 230V primary input; 10V parallel or 20V series secondary output). The component is RoHS compliant, REACH unaffected, and maintains active product status with 893 units in current inventory. Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and design standardization across compatible applications.

Substiute Parts

DST5-20B15

Pulse ElectronicsIn Stock: 1000DST5-20B15 Datasheet

Current PartRFQ

3FD-520

TamuraIn Stock: 21273FD-520 Datasheet

SimilarRFQ

FS20-600

Triad MagneticsIn Stock: 2216FS20-600 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DST5-20B15 are qualified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Electrical Parameters (Must Match):

• Power rating: 12VA
• Primary voltage options: 115V, 230V
• Secondary voltage configurations: Parallel 10V, Series 20V
• Secondary current capacity: Parallel 1.2A, Series 600mA
• Primary winding configuration: Dual
• Secondary winding configuration: Dual
• Voltage isolation: 2500Vrms
• Core type: Laminated

Mechanical Parameters (Must Match):

• Mounting type: Through Hole
• Termination style: PC Pin

Compliance Parameters (Must Match):

• RoHS compliance status
• ECCN classification: EAR99
• HTSUS code: 8504.31.4035

The following parts meet all substitution criteria and are classified as direct equivalents:

1. 3FD-520 (Tamura) – Series 3FD-5xx
2. FS20-600 (Triad Magnetics) – Series Split Pack™

Parameter Comparison

Engineering Selection Recommendations

All three parts—DST5-20B15, 3FD-520, and FS20-600—are active products with equivalent electrical specifications and meet regulatory compliance requirements. Selection between these parts is based on the following factors:

Compliance Considerations:

• DST5-20B15 and 3FD-520 carry RoHS Compliant status
• FS20-600 carries ROHS3 Compliant status, representing an updated compliance standard
• All three parts are REACH unaffected and classified as EAR99 for export control purposes

Packaging and Inventory:

• DST5-20B15: 893 units available, packaged as specified
• 3FD-520: 2098 units available, packaged in Tube
• FS20-600: 2117 units available, packaged in Box

Physical Dimensions:

• DST5-20B15 and FS20-600 exhibit minimal dimensional variance (within 0.4mm length, 0.05mm width, 0.08mm height)
• 3FD-520 shows slightly larger dimensions (1.26mm longer, 1.90mm wider, 1.42mm taller)

For applications with strict PCB layout constraints, DST5-20B15 or FS20-600 are preferred. For general applications, all three parts are functionally interchangeable.

Frequently Asked Questions (FAQ)

Q: Can the 3FD-520 replace the DST5-20B15 in existing designs?

A: Yes. Both parts share identical electrical specifications (12VA, dual primary/secondary windings, 115V/230V primary, 10V parallel/20V series secondary, 1.2A parallel/600mA series output, 2500Vrms isolation). Both use through-hole PC pin termination and laminated core construction. Dimensional differences are minor (3FD-520 is approximately 1.26mm longer, 1.90mm wider, and 1.42mm taller). PCB layout verification is required for space-constrained applications.

Q: What is the difference between RoHS Compliant and ROHS3 Compliant?

A: RoHS Compliant refers to the original Restriction of Hazardous Substances directive compliance. ROHS3 Compliant indicates compliance with the updated RoHS 3 directive (2015/863/EU), which includes additional restricted substances. Both certifications meet current regulatory requirements; ROHS3 represents a more recent standard.

Q: Are there packaging differences between these parts?

A: Yes. DST5-20B15 is packaged as specified (standard packaging), 3FD-520 is supplied in Tube packaging, and FS20-600 is supplied in Box packaging. Packaging selection may affect handling, storage, and logistics considerations but does not impact electrical or mechanical performance.

Q: Do all three parts have the same moisture sensitivity level?

A: DST5-20B15 and 3FD-520 both carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. FS20-600 is listed as Not Applicable for MSL, which is consistent with transformer component classification. All three parts are suitable for standard storage and handling conditions.

Q: Which part should be selected for new designs?

A: Selection depends on availability, packaging requirements, and compliance preferences. All three parts are active products with equivalent electrical performance. FS20-600 offers the highest inventory availability (2117 units) and ROHS3 compliance. 3FD-520 provides the second-highest availability (2098 units). DST5-20B15 is the original reference part with 893 units in stock.