LP-20-300 Equivalent & Substitute Parts

Part Overview

The LP-20-300 is a 6VA semi-toroidal power transformer manufactured by Signal Transformer, designed for through-hole mounting applications. It features dual primary and secondary windings with selectable voltage configurations (115V or 230V primary input; 10V parallel or 20V series secondary output). The part is currently active in production with 906 units in stock. Equivalent substitute parts are identified when identical electrical specifications and mechanical compatibility are maintained across alternative core technologies and manufacturers.

Substiute Parts

LP-20-300

Signal TransformerIn Stock: 1004LP-20-300 Datasheet

Current PartRFQ

3FL20-300

TamuraIn Stock: 12273FL20-300 Datasheet

DirectRFQ

FP20-300

Triad MagneticsIn Stock: 915FP20-300 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP-20-300 are qualified based on the following criteria:

Electrical Parameters (Must Match):

• Power rating: 6VA
• Primary voltage options: 115V, 230V
• Secondary voltage configurations: 10V parallel, 20V series
• Output current ratings: 600mA parallel, 300mA series
• Dual primary and dual secondary windings
• No center tap requirement

Mechanical Parameters (Must Match):

• Mounting type: Through hole
• Termination style: PC pin
• Physical dimensions: Length 47.50–47.63mm, Width 39.60–39.67mm, Height 21.60–22.22mm (within tolerance)

Compliance Parameters (Must Match or Exceed):

• Isolation voltage: 1500Vrms minimum
• RoHS compliance: ROHS3 or equivalent
• ECCN/HTSUS classification alignment

Core technology (semi-toroidal vs. laminated) does not restrict substitution when all electrical and mechanical parameters are met.

Parameter Comparison

Engineering Selection Recommendations

All three parts meet the core electrical and mechanical substitution criteria. Selection between LP-20-300, 3FL20-300, and FP20-300 is determined by the following factors:

LP-20-300 (Signal Transformer): Semi-toroidal core design. ROHS3 compliant. 1500Vrms isolation. Suitable for applications where semi-toroidal construction is specified or preferred for EMI characteristics.

3FL20-300 (Tamura): Laminated core design. RoHS compliant. 1500Vrms isolation. Moisture sensitivity level 1 (unlimited). Suitable for general-purpose applications with no moisture sensitivity constraints.

FP20-300 (Triad Magnetics): Laminated core design. ROHS3 compliant. 2000Vrms isolation (exceeds minimum requirement). Flat Pack™ series designation. Suitable for applications requiring higher isolation voltage margin or where Triad Magnetics supply chain is preferred.

All parts carry identical ECCN (EAR99) and HTSUS (8504.31.4035) classifications, confirming regulatory equivalence.

Frequently Asked Questions (FAQ)

Q: Can 3FL20-300 and FP20-300 be used interchangeably with LP-20-300?

A: Yes. All three parts deliver identical electrical performance (6VA, dual primary/secondary windings, 115V/230V primary, 10V/20V secondary, 600mA/300mA output). Physical dimensions are within tolerance for through-hole mounting. All meet RoHS compliance and ECCN/HTSUS requirements.

Q: What is the difference between semi-toroidal and laminated core designs?

A: Core technology differs, but electrical specifications remain identical. Semi-toroidal (LP-20-300) and laminated core (3FL20-300, FP20-300) designs achieve the same voltage transformation, current capacity, and isolation performance. Core selection is based on application-specific requirements such as EMI performance or thermal characteristics, which are not specified in the substitution parameters.

Q: Does the higher isolation voltage of FP20-300 (2000Vrms vs. 1500Vrms) affect compatibility?

A: No. FP20-300 exceeds the minimum isolation requirement of 1500Vrms. Higher isolation voltage is a performance advantage and does not create incompatibility. Applications designed for 1500Vrms isolation operate safely with 2000Vrms isolation.

Q: Are there packaging differences between these parts?

A: Yes. LP-20-300 is supplied in bulk packaging, 3FL20-300 in tube packaging, and FP20-300 in box packaging. Packaging does not affect electrical or mechanical compatibility; it reflects supplier logistics and inventory management practices.

Q: Can these parts be used in applications requiring moisture sensitivity control?

A: 3FL20-300 carries MSL 1 (unlimited moisture sensitivity level), indicating no moisture sensitivity constraints. LP-20-300 and FP20-300 are marked "Not Applicable" for MSL, indicating they are not moisture-sensitive components. All three are suitable for standard storage and handling conditions.

Q: What is the weight difference, and does it matter?

A: LP-20-300 and FP20-300 both weigh 0.438 lb (198.67 g). 3FL20-300 weight is not specified. Weight differences of this magnitude do not affect electrical performance or mechanical mounting compatibility in through-hole applications.