LP-20-125 Equivalent & Substitute Parts

Part Overview

The LP-20-125 is a semi-toroidal power transformer manufactured by Signal Transformer, rated at 2VA with dual primary and secondary windings. This through-hole component is designed for applications requiring 115V or 230V primary input with configurable secondary output of 10V parallel or 20V series. The part maintains Active product status and is RoHS3 compliant, making it suitable for modern electronic equipment requiring regulated power conversion in compact form factors.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter range, ensuring functional interchangeability in target applications.

Substiute Parts

LP-20-125

Signal TransformerIn Stock: 1083LP-20-125 Datasheet

Current PartRFQ

FP20-125

Triad MagneticsIn Stock: 731FP20-125 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The FP20-125 (Triad Magnetics) qualifies as a direct substitute based on the following alignment of critical electrical and mechanical parameters:

Electrical Compatibility:

• Identical primary voltage configuration: 115V, 230V dual winding
• Identical secondary voltage output: Parallel 10V, Series 20V
• Identical maximum output current: Parallel 250mA, Series 125mA
• Dual primary and secondary winding architecture maintained
• Isolation voltage exceeds minimum requirement (2000Vrms vs. 1500Vrms)

Mechanical Compatibility:

• Through-hole mounting type preserved
• PC pin termination style maintained
• Physical dimensions within tolerance: 47.63mm L x 39.67mm W (vs. 47.50mm L x 39.60mm W)
• Height seated maximum: 16.51mm (vs. 16.50mm)
• Weight equivalent: 0.313 lb (141.97 g)

Regulatory Compliance:

• RoHS3 compliant status maintained
• REACH unaffected classification preserved
• ECCN and HTSUS codes identical

The primary difference is core construction type (semi-toroidal vs. laminated) and power rating (2VA vs. 2.5VA), with the substitute offering higher power capacity within the same form factor and electrical interface.

Parameter Comparison

Engineering Selection Recommendations

Both the LP-20-125 and FP20-125 maintain Active product status with full RoHS3 and REACH compliance, ensuring long-term availability and regulatory alignment for new designs. The FP20-125 provides higher isolation voltage (2000Vrms) and increased power capacity (2.5VA) within identical electrical interface and mechanical envelope specifications, offering enhanced safety margins in applications where isolation performance is critical.

Selection between these parts should be based on core construction preference, availability, and specific application isolation requirements. Both parts satisfy the electrical and mechanical constraints of through-hole transformer applications requiring dual-winding configuration with 115V/230V primary input and 10V/20V secondary output.

Frequently Asked Questions (FAQ)

Q: Can the FP20-125 directly replace the LP-20-125 in existing designs?

A: Yes. Both parts share identical electrical interfaces (primary voltage, secondary voltage, output current ratings, winding configuration) and mechanical specifications (through-hole mounting, PC pin termination, form factor). The FP20-125 operates within the same parameter space with higher isolation voltage and power capacity.

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

A: Core construction type affects electromagnetic efficiency and thermal characteristics but does not alter the electrical interface or output specifications. Both construction methods deliver the specified voltage and current ratings within the defined isolation and power parameters.

Q: Are there any packaging differences between these parts?

A: The LP-20-125 is supplied in Bulk packaging, while the FP20-125 is supplied in Box packaging. Both use identical through-hole PC pin termination and fit the same PCB footprint.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the LP-20-125 and FP20-125 are RoHS3 compliant and REACH unaffected, meeting current environmental and safety standards for electronic component manufacturing and use.

Q: What is the isolation voltage specification used for?

A: Isolation voltage (1500Vrms for LP-20-125, 2000Vrms for FP20-125) specifies the maximum voltage that can be safely applied between primary and secondary windings without electrical breakdown. The FP20-125 provides higher isolation margin for applications requiring enhanced safety separation between input and output circuits.