LP-56-45 Equivalent & Substitute Parts

Part Overview

The LP-56-45 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 28V parallel or 56V series. The part maintains Active product status and is RoHS3 compliant, making it suitable for current production environments. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the allowed parameter tolerances for this transformer category.

Substiute Parts

LP-56-45

Signal TransformerIn Stock: 1008LP-56-45 Datasheet

Current PartRFQ

FP56-45

Triad MagneticsIn Stock: 756FP56-45 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP-56-45 is determined by the following critical parameters:

• Voltage - Primary: 115V, 230V (dual input capability required)
• Voltage - Secondary (Full Load): Parallel 28V, Series 56V (exact output voltage configuration)
• Current - Output (Max): Parallel 90mA, Series 45mA (current capacity match)
• Primary Winding(s): Dual (winding configuration)
• Secondary Winding(s): Dual (winding configuration)
• Mounting Type: Through Hole (PCB integration method)
• Termination Style: PC Pin (connection method)

The FP56-45 from Triad Magnetics qualifies as a direct substitute based on matching all critical electrical parameters and mechanical compatibility. While the FP56-45 features a laminated core design versus the semi-toroidal construction of the LP-56-45, and provides higher power capacity (2.5VA versus 2VA) and isolation voltage (2000Vrms versus 1500Vrms), these represent performance enhancements that maintain full compatibility with applications designed for the LP-56-45.

Parameter Comparison

Engineering Selection Recommendations

Both the LP-56-45 and FP56-45 maintain Active product status and ROHS3 compliance, qualifying them for current production use. The FP56-45 provides enhanced specifications in power capacity and isolation voltage while maintaining dimensional compatibility and identical electrical output characteristics. Selection between these parts should be based on application-specific requirements for power headroom and isolation performance, with both parts suitable for through-hole PCB assembly with PC pin termination.

Frequently Asked Questions (FAQ)

Q: Can the FP56-45 be used as a direct replacement for the LP-56-45?

A: Yes. The FP56-45 matches all critical electrical parameters including primary voltage (115V, 230V), secondary voltage configuration (Parallel 28V, Series 56V), and output current ratings (Parallel 90mA, Series 45mA). Mechanical compatibility is maintained through identical mounting type (Through Hole) and termination style (PC Pin), with dimensions within 0.13mm variation.

Q: What are the key differences between these two transformers?

A: The LP-56-45 uses semi-toroidal core construction with 2VA power rating and 1500Vrms isolation. The FP56-45 uses laminated core construction with 2.5VA power rating and 2000Vrms isolation. Both deliver identical secondary voltage and current outputs.

Q: Are there packaging differences between these parts?

A: The LP-56-45 is supplied in Bulk packaging, while the FP56-45 is supplied in Box packaging. Both are through-hole components with PC pin termination suitable for standard PCB assembly processes.

Q: Do both parts meet current compliance requirements?

A: Yes. Both the LP-56-45 and FP56-45 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for production applications.