FP120-50 Equivalent & Substitute Parts Reference

Part Overview

The FP120-50 is a 6VA laminated core power transformer manufactured by Triad Magnetics, designed for through-hole mounting applications. This Active product features dual primary and secondary windings with selectable voltage configurations (115V/230V primary input; 60V parallel or 120V series secondary output). The transformer is specified for maximum output current of 100mA (parallel) or 50mA (series) and provides 2000Vrms isolation voltage. As an Active product with full RoHS3 compliance and REACH Unaffected status, equivalent substitute parts may be required due to inventory constraints, application-specific dimensional requirements, or procurement lead time considerations.

Substiute Parts

FP120-50

Triad MagneticsIn Stock: 838FP120-50 Datasheet

Current PartRFQ

229A120

Hammond ManufacturingIn Stock: 931229A120 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FP120-50 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Power rating: 6VA (exact match required)
• Primary voltage options: 115V and 230V (both must be supported)
• Secondary voltage configurations: 60V parallel and 120V series (both must be supported)
• Output current capacity: 100mA parallel and 50mA series (exact match required)
• Winding configuration: Dual primary and dual secondary (exact match required)
• Isolation voltage: Minimum 1750Vrms (FP120-50 specifies 2000Vrms; substitutes must meet or exceed this requirement)

Mechanical Equivalence Requirements:

• Mounting type: Through hole (exact match required)
• Termination style: PC pin (exact match required)
• Form factor: Dimensions and height must accommodate the same PCB footprint and clearance envelope

Compliance Requirements:

• RoHS3 compliance (mandatory)
• REACH Unaffected status (mandatory)

The Hammond Manufacturing 229A120 qualifies as an equivalent substitute based on matching all electrical parameters, mounting configuration, and compliance certifications. The primary distinction is core type (semi-toroidal versus laminated) and dimensional footprint, which do not affect electrical substitutability when mechanical constraints are satisfied.

Parameter Comparison

Engineering Selection Recommendations

FP120-50 (Triad Magnetics, Laminated Core): Select this part when the original design specifies laminated core construction and the PCB layout accommodates dimensions of 47.63mm L × 39.67mm W. This part is Active with full inventory availability (776 pcs). The 2000Vrms isolation voltage provides maximum margin for high-voltage isolation applications.

229A120 (Hammond Manufacturing, Semi-Toroidal Core): Select this substitute when PCB space constraints require a more compact length dimension (39.62mm L) or when semi-toroidal core characteristics are acceptable for the application. This part is Active with strong inventory availability (870 pcs). The 1750Vrms isolation voltage meets standard industrial isolation requirements and is suitable for applications not requiring the extended 2000Vrms margin. Dimensional footprint differs in length and width; verify PCB layout compatibility before substitution.

Both parts carry identical electrical specifications, dual primary/secondary winding configurations, and full compliance certifications. Selection between them depends on mechanical fit within the PCB assembly and core type preference.

Frequently Asked Questions (FAQ)

Q: Can the 229A120 be used as a direct replacement for the FP120-50?

A: The 229A120 is electrically equivalent to the FP120-50 across all voltage, current, and power specifications. However, it is not a direct mechanical replacement due to different footprint dimensions (39.62mm L × 47.75mm W versus 47.63mm L × 39.67mm W). PCB layout and mounting hole positions must be verified for compatibility before substitution.

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

A: The FP120-50 uses laminated core construction; the 229A120 uses semi-toroidal construction. Both are transformer core types that differ in physical geometry and manufacturing process. For this 6VA application, both constructions deliver equivalent electrical performance at the specified voltage and current ratings.

Q: Does the 1750Vrms isolation voltage of the 229A120 meet the requirements of the FP120-50?

A: The FP120-50 specifies 2000Vrms isolation voltage. The 229A120 provides 1750Vrms isolation voltage. The substitute meets the minimum isolation requirement for standard industrial applications. Applications requiring the full 2000Vrms margin must use the FP120-50.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the FP120-50 and 229A120 are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

Q: What is the weight difference between these parts?

A: The FP120-50 weighs 0.438 lb (198.67 g); the 229A120 weighs 0.6 lb (272.16 g). The semi-toroidal design of the 229A120 results in approximately 37% greater weight.

Q: Can I use the 229A120 if my PCB is designed for the FP120-50 footprint?

A: No. The footprint dimensions differ significantly. The 229A120 has a length of 39.62mm (versus 47.63mm) and width of 47.75mm (versus 39.67mm). PCB mounting holes and clearance envelopes must be re-evaluated and potentially redesigned to accommodate the 229A120.

Q: Are the primary and secondary winding configurations identical?

A: Yes. Both parts feature dual primary windings and dual secondary windings with identical voltage and current specifications, enabling equivalent circuit operation.