FP40-300 Equivalent & Substitute Parts Reference

Part Overview

The FP40-300 is a 12VA laminated core power transformer manufactured by Triad Magnetics, designed for through-hole mounting applications. This transformer features dual primary and secondary windings with selectable voltage configurations (115V/230V primary input; 20V parallel or 40V series secondary output). The part is currently active in production with 690 units in stock inventory.

Equivalent and substitute parts are identified when they maintain identical electrical performance specifications and mechanical compatibility within the through-hole mounting category. Substitution becomes necessary due to inventory availability, lead time considerations, or procurement source optimization while maintaining functional equivalence.

Substiute Parts

FP40-300

Triad MagneticsIn Stock: 742FP40-300 Datasheet

Current PartRFQ

229B40

Hammond ManufacturingIn Stock: 1011229B40 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FP40-300 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Identical power rating: 12VA
• Matching primary voltage inputs: 115V and 230V dual configuration
• Matching secondary voltage outputs: 20V parallel and 40V series
• Matching maximum output current specifications: 600mA parallel, 300mA series
• Dual primary and dual secondary winding architecture

Mechanical Compatibility Requirements:

• Through-hole mounting type
• PC pin termination style
• Physical dimensions compatible with standard PCB hole spacing

Regulatory Compliance Requirements:

• ROHS3 compliance
• REACH unaffected status
• EAR99 export classification

The Hammond Manufacturing 229B40 qualifies as a direct substitute based on complete electrical parameter equivalence and mechanical compatibility. The primary distinction is core construction type (semi-toroidal versus laminated) and minor dimensional variations, which do not affect functional substitutability in through-hole applications.

Parameter Comparison

Engineering Selection Recommendations

Both the FP40-300 and 229B40 are active production components with full ROHS3 compliance and REACH unaffected status, qualifying them for use in regulated applications.

FP40-300 Selection Criteria:

• Primary choice when 2000Vrms isolation voltage is specified
• Laminated core construction preferred for specific EMI/RFI performance requirements
• Triad Magnetics supply chain preferred

229B40 Selection Criteria:

• Acceptable substitute when isolation voltage requirement is 1750Vrms or lower
• Semi-toroidal core construction suitable for space-constrained applications
• Hammond Manufacturing supply chain preferred
• Higher inventory availability (941 units versus 690 units)

Both parts satisfy identical electrical load requirements and mounting specifications. Selection between them depends on isolation voltage requirements and supply chain considerations.

Frequently Asked Questions (FAQ)

Q: Can the 229B40 replace the FP40-300 in all applications?

A: The 229B40 is electrically equivalent for all power delivery specifications (12VA, dual 115V/230V primary, dual 20V/40V secondary outputs). However, the isolation voltage differs: FP40-300 provides 2000Vrms while 229B40 provides 1750Vrms. Substitution is valid only when the application isolation requirement is 1750Vrms or lower.

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

A: Core type is a manufacturing distinction that does not affect electrical equivalence for these specifications. Both constructions deliver identical voltage and current outputs. Core type selection depends on specific application requirements such as EMI performance or physical space constraints, which are not specified in the substitution parameters.

Q: Are the physical dimensions compatible with existing PCB layouts?

A: Both parts use through-hole PC pin termination. The FP40-300 dimensions are 63.50mm L × 50.80mm W × 26.97mm H (seated). The 229B40 dimensions are 50.80mm L × 63.50mm W × 27.18mm H (seated). Dimensions are transposed but heights are equivalent. PCB hole spacing compatibility must be verified against specific board layout requirements.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both FP40-300 and 229B40 are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export purposes. Both are active production parts with current regulatory status.

Q: What is the weight difference between these parts?

A: FP40-300 weighs 0.688 lb (312.07 g). 229B40 weighs 0.6 lb (272.16 g). The weight difference reflects core construction differences and does not affect electrical performance.