LP20-300B7 Equivalent & Substitute Parts

Part Overview

The LP20-300B7 is a 6VA semi-toroidal power transformer manufactured by Pulse Electronics, designed for through-hole mounting applications. This component features dual primary and secondary windings with configurable output options (parallel 10V/600mA or series 20V/300mA). The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

LP20-300B7

Pulse ElectronicsIn Stock: 785LP20-300B7 Datasheet

Current PartRFQ

3FL20-300

TamuraIn Stock: 12273FL20-300 Datasheet

DirectRFQ

LP-20-300

Signal TransformerIn Stock: 1004LP-20-300 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP20-300B7 are qualified based on strict electrical and mechanical parameter alignment. The following criteria determine substitutability:

Critical Matching Parameters:

• Power rating: 6VA
• Secondary voltage configuration: Parallel 10V, Series 20V
• Secondary current capacity: Parallel 600mA, Series 300mA
• Primary winding configuration: Dual
• Secondary winding configuration: Dual
• Isolation voltage: 1500Vrms
• Mounting type: Through Hole
• Termination style: PC Pin
• Physical dimensions: Within tolerance of 47.63mm L x 39.67mm W x 21.59mm H (max seated height)

Two substitute parts meet these criteria: the 3FL20-300 (Tamura, laminated core type) and the LP-20-300 (Signal Transformer, semi-toroidal type). Both maintain identical electrical specifications and mechanical compatibility with the original LP20-300B7 footprint and performance envelope.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts maintain full electrical and mechanical compatibility with the LP20-300B7. Selection between alternatives should be based on product status and compliance requirements:

The LP-20-300 (Signal Transformer) is a direct form-fit-function replacement with identical semi-toroidal core construction and ROHS3 compliance certification. This part is currently in active production status with 906 units available in inventory.

The 3FL20-300 (Tamura) provides equivalent electrical performance with laminated core construction and RoHS compliance. This part is also in active production status with 1215 units available in inventory. The laminated core design represents a different core technology while maintaining all specified electrical parameters and physical dimensions.

Both parts are RoHS compliant and carry identical isolation voltage ratings, primary/secondary winding configurations, and output current specifications. Dimensional tolerances across all three parts remain within acceptable PCB mounting clearances.

Frequently Asked Questions (FAQ)

Q: Can the 3FL20-300 replace the LP20-300B7 despite different core types?

A: Yes. The 3FL20-300 laminated core transformer meets all electrical specifications of the LP20-300B7, including 6VA power rating, 1500Vrms isolation voltage, and identical secondary voltage/current configurations. Core type difference does not affect substitutability when all electrical and mechanical parameters align.

Q: Are dimensional differences between substitute parts significant?

A: No. The LP-20-300 measures 47.50mm L x 39.60mm W, the 3FL20-300 measures 47.60mm L x 39.60mm W, and the original LP20-300B7 measures 47.63mm L x 39.67mm W. All three parts maintain 21.59-21.60mm maximum seated height. These variations are within standard PCB mounting tolerances and do not affect board layout compatibility.

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

A: ROHS3 represents the current RoHS Directive 2011/65/EU implementation with updated substance restrictions. Both RoHS and ROHS3 compliant parts meet environmental compliance requirements. The LP-20-300 carries ROHS3 certification, representing the most current compliance standard.

Q: Are both substitute parts available in the same packaging as the original?

A: The LP20-300B7 was supplied in standard packaging. The LP-20-300 is available in bulk packaging with 906 units in stock. The 3FL20-300 is available in tube packaging with 1215 units in stock. Packaging format does not affect component functionality or electrical performance.

Q: Can I use either substitute part interchangeably in new designs?

A: Yes. Both the LP-20-300 and 3FL20-300 meet all electrical and mechanical specifications required for applications previously served by the LP20-300B7. Both parts are in active production status, ensuring long-term availability for new design implementations.