LP-34-75 Equivalent & Substitute Parts

Part Overview

The LP-34-75 is a semi-toroidal power transformer manufactured by Signal Transformer, rated at 2VA 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 either 17V (parallel) or 34V (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 specified parameter tolerances.

Substiute Parts

LP-34-75

Signal TransformerIn Stock: 1149LP-34-75 Datasheet

Current PartRFQ

FP34-75

Triad MagneticsIn Stock: 1202FP34-75 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The FP34-75 manufactured by Triad Magnetics qualifies as a direct substitute based on the following critical parameters:

• Voltage specifications: Both primary (115V, 230V) and secondary (Parallel 17V, Series 34V) voltages are identical
• Current ratings: Maximum output current matches exactly (Parallel 150mA, Series 75mA)
• Winding configuration: Both parts feature dual primary and dual secondary windings
• Mounting and termination: Through-hole mounting with PC pin termination are consistent
• Compliance: Both parts maintain ROHS3 compliance and identical regulatory classifications (EAR99, HTSUS 8504.31.4035)

The primary differences are core construction type (semi-toroidal versus laminated), maximum power rating (2VA versus 2.5VA), isolation voltage (1500Vrms versus 2000Vrms), and physical dimensions within millimeter tolerances. These differences do not preclude substitution when the electrical load requirements remain within the specified parameters.

Parameter Comparison

Engineering Selection Recommendations

Both the LP-34-75 and FP34-75 maintain Active product status with full RoHS3 compliance, ensuring availability and regulatory alignment for current production. The FP34-75 provides a higher maximum power rating (2.5VA versus 2VA) and increased isolation voltage (2000Vrms versus 1500Vrms), offering additional design margin in applications where these parameters are relevant. Mechanical compatibility is confirmed through equivalent mounting type, termination style, and dimensions within tolerance. Selection between these parts should be based on specific application requirements regarding power headroom and isolation voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can the FP34-75 be used as a direct replacement for the LP-34-75 in existing designs?

A: Yes, provided the application load does not exceed the specified current ratings (Parallel 150mA, Series 75mA). The identical voltage specifications, winding configuration, and through-hole PC pin termination ensure mechanical and electrical compatibility. Physical dimensions are equivalent within manufacturing tolerances.

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

A: The LP-34-75 uses semi-toroidal core construction with 1500Vrms isolation, while the FP34-75 employs laminated core construction with 2000Vrms isolation. The FP34-75 has a higher maximum power rating of 2.5VA compared to 2VA. All primary and secondary voltage specifications, current ratings, and winding configurations are identical.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both parts are ROHS3 compliant and share identical regulatory classifications (EAR99, HTSUS 8504.31.4035). Both maintain Active product status.

Q: How do the physical dimensions compare?

A: Dimensions are nearly identical. LP-34-75: 47.50mm L x 39.60mm W x 16.50mm H (max). FP34-75: 47.63mm L x 39.67mm W x 16.51mm H (max). These differences are within standard manufacturing tolerances and do not affect PCB layout compatibility.

Q: Which transformer should I select for new designs?

A: Selection depends on application-specific requirements. If higher isolation voltage (2000Vrms) or additional power margin (2.5VA) is beneficial, the FP34-75 is appropriate. If the LP-34-75 specifications fully satisfy the design requirements, either part is suitable based on availability and lead time.