PF24-12 Semi-Toroidal Power Transformer Equivalent & Substitute Parts

Part Overview

The PF24-12 is a semi-toroidal power transformer manufactured by Tamura, rated at 24VA with dual primary and secondary windings. This transformer supports input voltages of 115V or 230V and delivers output configurations of 6.3V parallel (3.8A maximum) or 12.6V series (1.9A maximum). The device is classified as obsolete, making identification of functionally equivalent substitute components essential for ongoing system maintenance and new design implementations where legacy specifications must be maintained.

Substiute Parts

PF24-12

TamuraIn Stock: 1116PF24-12 Datasheet

Current PartRFQ

LP-12-1900

Signal TransformerIn Stock: 836LP-12-1900 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PF24-12 is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

• Power rating of 24VA
• Primary voltage support for both 115V and 230V
• Secondary voltage outputs matching 6.3V (parallel) and 12.6V (series) configurations
• Output current capacity of 3.8A (parallel) and 1.9A (series)
• Dual primary and dual secondary winding architecture
• Isolation voltage of 1500Vrms
• Absence of center tap

Mechanical Specifications:

• Semi-toroidal transformer type
• Through-hole mounting capability
• PC pin termination style
• Physical dimensions compatible with 72mm length and 58mm width envelope
• Maximum seated height of 31.80mm

Regulatory Compliance:

• ECCN classification: EAR99
• HTSUS code: 8504.31.4035

The LP-12-1900 manufactured by Signal Transformer meets all specified electrical and mechanical parameters, confirming direct substitution capability.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The PF24-12 is classified as obsolete. The LP-12-1900 substitute is classified as active, ensuring continued availability and manufacturing support. Selection of the LP-12-1900 provides access to an actively produced component with equivalent electrical and mechanical specifications.

Compliance and Certifications: Both components share identical ECCN (EAR99) and HTSUS (8504.31.4035) classifications, confirming regulatory equivalence. The LP-12-1900 carries RoHS3 compliance and REACH unaffected status, providing additional environmental and regulatory documentation for applications requiring such certifications.

Physical Compatibility: Dimensional variations between the two components are minimal. The LP-12-1900 measures 72.90mm length by 57.20mm width, compared to the PF24-12 at 72.00mm by 58.00mm. Both share identical maximum seated height of 31.80mm. These dimensional tolerances fall within standard PCB layout accommodation ranges for through-hole mounted transformers.

Electrical Performance: All electrical parameters are identical across both components, including power rating, voltage configurations, current capacity, winding architecture, and isolation voltage. Direct functional substitution is supported without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the LP-12-1900 be used as a direct replacement for the PF24-12 in existing designs?

A: Yes. The LP-12-1900 meets all electrical and mechanical specifications of the PF24-12. Identical power rating (24VA), voltage configurations (115V/230V primary, 6.3V parallel/12.6V series secondary), output current capacity (3.8A parallel/1.9A series), winding architecture (dual primary and secondary), and isolation voltage (1500Vrms) confirm direct substitution capability. Through-hole mounting and PC pin termination are identical.

Q: What are the dimensional differences between these components?

A: The LP-12-1900 measures 72.90mm length by 57.20mm width, while the PF24-12 measures 72.00mm by 58.00mm. Both components have identical maximum seated height of 31.80mm. These dimensional variations are within standard tolerance ranges for through-hole transformer mounting and do not require PCB layout modification.

Q: Why is the PF24-12 listed as obsolete?

A: The PF24-12 is no longer in active production by Tamura. The LP-12-1900 provides equivalent functionality from an active manufacturer, ensuring continued component availability for maintenance and new implementations.

Q: Are there compliance differences between the PF24-12 and LP-12-1900?

A: Both components share identical ECCN (EAR99) and HTSUS (8504.31.4035) classifications. The LP-12-1900 carries RoHS3 compliance and REACH unaffected status, providing additional environmental documentation. The PF24-12 specifies Moisture Sensitivity Level 1 (Unlimited), while the LP-12-1900 lists MSL as Not Applicable.

Q: What is the primary reason to select the LP-12-1900 over the PF24-12?

A: Active production status and ongoing manufacturer support. The LP-12-1900 is actively manufactured by Signal Transformer, ensuring long-term availability and supply chain reliability. All electrical and mechanical specifications remain equivalent.

Q: Are the winding configurations identical?

A: Yes. Both components feature dual primary windings and dual secondary windings with no center tap. This architecture enables the same voltage configuration options: 6.3V parallel output or 12.6V series output.

Q: Can these transformers be used interchangeably in parallel or series configurations?

A: Yes. Both components support identical output configurations: parallel connection delivering 6.3V at 3.8A maximum, or series connection delivering 12.6V at 1.9A maximum. Winding configuration and isolation voltage are identical across both components.