DST3-20B13 Equivalent & Substitute Parts

Part Overview

The DST3-20B13 is a laminated core power transformer manufactured by Pulse Electronics, rated at 2.4VA 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 10V (parallel) or 20V (series). The part is currently active in production with RoHS compliance and unlimited moisture sensitivity rating, making it suitable for industrial and commercial electronic equipment.

Equivalent and substitute parts become necessary when the primary manufacturer experiences supply constraints, when design flexibility across multiple suppliers is required, or when procurement optimization is needed while maintaining identical electrical and mechanical performance specifications.

Substiute Parts

DST3-20B13

Pulse ElectronicsIn Stock: 914DST3-20B13 Datasheet

Current PartRFQ

DST-3-20

Signal TransformerIn Stock: 1565DST-3-20 Datasheet

DirectRFQ

FS20-120

Triad MagneticsIn Stock: 1154FS20-120 Datasheet

DirectRFQ

3FD-320

TamuraIn Stock: 56693FD-320 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DST3-20B13 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Identical power rating: 2.4VA
• Matching primary voltage options: 115V and 230V
• Matching secondary voltage configuration: Parallel 10V and Series 20V
• Matching output current specifications: Parallel 240mA and Series 120mA
• Identical isolation voltage: 2500Vrms
• Matching winding configuration: Dual primary and dual secondary

Mechanical Equivalence Requirements:

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

Compliance Requirements:

• RoHS compliance status
• Active product status

All substitute parts listed meet these criteria without exception. Dimensional variations within manufacturing tolerances do not affect functional substitutability.

Parameter Comparison

Engineering Selection Recommendations

All four parts listed—DST3-20B13, DST-3-20, FS20-120, and 3FD-320—are electrically and mechanically equivalent and maintain active product status with current RoHS compliance certifications. Selection among these parts should be based on:

Availability and Lead Time: Inventory levels vary across manufacturers. DST3-20B13 (Pulse Electronics) has 866 units in stock, DST-3-20 (Signal Transformer) has 1520 units, FS20-120 (Triad Magnetics) has 1123 units, and 3FD-320 (Tamura) has 5613 units available.

Packaging Format: DST3-20B13 and DST-3-20 are supplied in box packaging, FS20-120 in box packaging, and 3FD-320 in tube packaging. Packaging selection depends on assembly line requirements and handling procedures.

Dimensional Fit: While all parts are mechanically compatible, dimensional variations exist within manufacturing tolerances. The 3FD-320 has the largest footprint (35.56mm L × 31.00mm W × 32.10mm H seated), while FS20-120 has the smallest (34.93mm L × 28.58mm W × 30.15mm H seated). PCB layout constraints may influence selection.

Compliance Certifications: All parts maintain REACH Unaffected status and EAR99 export classification. RoHS compliance is confirmed across all variants.

Frequently Asked Questions (FAQ)

Q: Can DST-3-20 replace DST3-20B13 in existing designs?

A: Yes. DST-3-20 is electrically and mechanically equivalent, with identical power rating, voltage specifications, current ratings, winding configuration, isolation voltage, and mounting characteristics. Dimensional variations are within manufacturing tolerances and do not affect functional performance.

Q: What are the key differences between these substitute parts?

A: All parts are electrically identical. Differences are limited to manufacturer, packaging format, and dimensional tolerances. DST3-20B13 and DST-3-20 use box packaging; FS20-120 uses box packaging; 3FD-320 uses tube packaging. Dimensional variations range from 34.90mm to 35.56mm in length and 28.58mm to 31.00mm in width.

Q: Are there any compliance or certification differences?

A: All parts maintain RoHS compliance, REACH Unaffected status, and EAR99 export classification. DST3-20B13 and 3FD-320 carry RoHS Compliant designation, while DST-3-20 and FS20-120 carry ROHS3 Compliant designation. Both designations meet current regulatory requirements.

Q: Which part should be selected for space-constrained applications?

A: FS20-120 offers the smallest footprint at 34.93mm L × 28.58mm W × 30.15mm H seated. For applications with less stringent space requirements, all parts are interchangeable.

Q: What is the moisture sensitivity level for these parts?

A: DST3-20B13 and 3FD-320 have MSL 1 (Unlimited). DST-3-20 and FS20-120 have MSL Not Applicable, indicating no moisture sensitivity restrictions.

Q: Can these parts be used interchangeably in production?

A: Yes, provided PCB layout accommodates dimensional tolerances and packaging format is compatible with assembly procedures. All parts deliver identical electrical performance and meet the same compliance standards.