FP120-100 Equivalent & Substitute Parts Reference

Part Overview

The FP120-100 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, 60V/120V secondary), supporting parallel and series output modes. The part is currently active in production with 1084 units in stock inventory.

Equivalent and substitute parts are identified to provide design flexibility for procurement, inventory management, and supply chain continuity. Substitutes must maintain electrical compatibility across voltage ratings, power capacity, winding configurations, and mechanical mounting specifications.

Substiute Parts

FP120-100

Triad MagneticsIn Stock: 1143FP120-100 Datasheet

Current PartRFQ

229B120

Hammond ManufacturingIn Stock: 1044229B120 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FP120-100 are qualified based on the following electrical and mechanical compatibility criteria:

Electrical Compatibility Requirements:

• Identical power rating: 12VA
• Matching primary voltage options: 115V, 230V
• Matching secondary voltage outputs: Parallel 60V, Series 120V
• Matching output current specifications: Parallel 200mA, Series 100mA
• Dual primary and dual secondary winding configuration
• No center tap requirement
• Isolation voltage rating of 1750Vrms or higher

Mechanical Compatibility Requirements:

• Through-hole mounting type
• PC pin termination style
• Physical dimensions compatible with standard PCB layouts
• Height-seated specifications within acceptable tolerance ranges

Regulatory Compliance:

• ROHS3 compliance required
• REACH unaffected status
• EAR99 export classification

The Hammond Manufacturing 229B120 qualifies as a direct substitute based on these criteria. While the core type differs (semi-toroidal versus laminated), all electrical parameters, winding configurations, voltage ratings, current ratings, and mounting specifications are identical to the FP120-100.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (FP120-100): The FP120-100 is the specified component for applications requiring laminated core transformer construction. This part is active in production with substantial inventory availability (1084 units). ROHS3 compliance and EAR99 classification support standard procurement channels.

Substitute Part Selection (229B120): The Hammond Manufacturing 229B120 provides electrical equivalence with semi-toroidal core construction. This substitute is appropriate when:

• Laminated core availability is constrained
• Semi-toroidal construction meets application requirements
• PCB layout accommodates the rotated footprint (50.80mm L x 63.50mm W versus 63.50mm L x 50.80mm W)
• The 1750Vrms isolation voltage meets application isolation requirements

Both parts maintain ROHS3 compliance and REACH unaffected status, supporting equivalent regulatory qualification.

Frequently Asked Questions (FAQ)

Q: Can the 229B120 be used as a direct replacement for the FP120-100 in existing designs?

A: The 229B120 provides electrical equivalence across all voltage, current, and winding specifications. However, the footprint dimensions are rotated (length and width are transposed). PCB layout verification is required to confirm mechanical compatibility before substitution.

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

A: Laminated cores use stacked steel laminations, while semi-toroidal cores use a partially wound toroidal configuration. Both constructions deliver identical electrical performance for this 12VA transformer specification. Core type selection depends on application-specific requirements such as EMI characteristics, thermal performance, or mechanical constraints.

Q: Are the isolation voltage ratings equivalent?

A: The FP120-100 provides 2000Vrms isolation, while the 229B120 provides 1750Vrms isolation. Both exceed standard isolation requirements for 12VA transformers. The 229B120 is suitable for applications requiring 1750Vrms or lower isolation specifications.

Q: What inventory considerations apply to these parts?

A: The FP120-100 has 1084 units in stock (new original). The 229B120 has 954 units in stock (new original). Both parts are active in production. Packaging differs: FP120-100 is supplied in boxes, while 229B120 is supplied in bulk.

Q: Are both parts compliant with current regulatory standards?

A: Both the FP120-100 and 229B120 are ROHS3 compliant and REACH unaffected. Both carry EAR99 export classification, supporting standard procurement and distribution channels.

Q: What is the weight difference between these transformers?

A: The FP120-100 weighs 0.688 lb (312.07 g), while the 229B120 weighs 0.61 lb (276.69 g). The semi-toroidal construction results in approximately 11% weight reduction. This difference is negligible for most applications but may be relevant for weight-sensitive designs.