FD7-28 Equivalent & Substitute Parts Reference

Part Overview

The FD7-28 is a laminated core power transformer manufactured by Triad Magnetics, rated at 56VA with dual primary windings (115V/230V) and a single 28V secondary winding with center tap. This chassis mount transformer is designed for applications requiring isolated AC power conversion with flexible input voltage selection. The part is currently active in production with 892 units in stock. Equivalent and substitute parts are identified when they meet identical electrical specifications, mechanical compatibility, and regulatory compliance requirements.

Key Parameters

Parameter	Specification
Power Rating	56VA
Primary Voltage	115V, 230V (Dual)
Secondary Voltage	28V
Secondary Current (Max)	2A
Core Type	Laminated
Center Tap	Yes
Mounting Type	Chassis Mount
Termination Style	Solder, Quick Connect - 0.187" (4.7mm)
Isolation Voltage	2500VAC
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the FD7-28 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Power rating: 56VA
Primary winding configuration: Dual 115V/230V
Secondary voltage: 28V
Secondary current capacity: 2A minimum
Center tap presence: Required
Isolation voltage: 2500VAC minimum

Mechanical Equivalence Criteria:

Mounting type: Chassis mount
Termination style: Solder and Quick Connect compatible
Physical dimensions: Within tolerance for board layout compatibility
Weight: Approximately 1.7 lbs (771.1 g)

Regulatory Equivalence Criteria:

RoHS3 compliance
REACH unaffected status
ECCN classification: EAR99
HTSUS code: 8504.31.4065

The substitute part DP-241-7-28 meets all electrical, mechanical, and regulatory requirements for direct substitution.

Parameter Comparison

Parameter	FD7-28 (Triad Magnetics)	DP-241-7-28 (Signal Transformer)	Match Status
Power Rating	56VA	56VA	Equivalent
Primary Voltage	115V, 230V	115V, 230V	Equivalent
Secondary Voltage	28V	28V	Equivalent
Secondary Current (Max)	2A	2A	Equivalent
Primary Winding(s)	Dual	Dual	Equivalent
Secondary Winding(s)	Single	Single	Equivalent
Center Tap	Yes	Yes	Equivalent
Core Type	Laminated	Laminated	Equivalent
Mounting Type	Chassis Mount	Chassis Mount	Equivalent
Termination Style	Solder, Quick Connect - 0.187" (4.7mm)	Solder, Quick Connect	Equivalent
Isolation Voltage	2500VAC	2500Vrms	Equivalent
Length	93.65mm	93.70mm	Compatible
Width	46.02mm	49.20mm	Compatible
Height (Seated Max)	57.15mm	57.80mm	Compatible
Weight	1.7 lbs (771.1 g)	1.7 lbs (771.1 g)	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent
ECCN	EAR99	EAR99	Equivalent
HTSUS Code	8504.31.4065	8504.31.4065	Equivalent

Engineering Selection Recommendations

FD7-28 (Triad Magnetics):

Active product status with established supply chain
892 units currently in stock
ROHS3 compliant and REACH unaffected
Suitable for applications requiring immediate availability from primary manufacturer

DP-241-7-28 (Signal Transformer):

Active product status with higher inventory availability
1977 units currently in stock
ROHS3 compliant and REACH unaffected
Suitable for applications requiring extended supply assurance
Dimensions within acceptable tolerance for chassis mount applications
Identical electrical performance and isolation specifications

Both parts satisfy identical regulatory requirements (ECCN EAR99, HTSUS 8504.31.4065) and are suitable for direct substitution in applications requiring 56VA laminated core transformers with dual primary and center-tapped secondary configurations.

Frequently Asked Questions (FAQ)

Q: Can DP-241-7-28 be used as a direct replacement for FD7-28?

A: Yes. The DP-241-7-28 meets all electrical specifications (56VA, dual 115V/230V primary, 28V secondary with center tap, 2A output, 2500VAC isolation), mechanical requirements (chassis mount, solder and quick connect termination), and regulatory compliance (ROHS3, REACH unaffected, EAR99) required for direct substitution.

Q: Are there dimensional differences between these parts?

A: Minor dimensional variations exist. The DP-241-7-28 measures 93.70mm L × 49.20mm W × 57.80mm H (seated), compared to the FD7-28 at 93.65mm L × 46.02mm W × 57.15mm H (seated). These differences are within acceptable tolerance for standard chassis mount applications and do not affect electrical performance or mounting compatibility.

Q: Do both transformers support the same input voltage options?

A: Yes. Both the FD7-28 and DP-241-7-28 feature dual primary windings supporting 115V and 230V input selection, providing identical flexibility for international or dual-voltage applications.

Q: Is the center tap configuration identical on both parts?

A: Yes. Both transformers include a center-tapped secondary winding on the 28V output, enabling applications requiring split-rail or balanced voltage configurations.

Q: What is the maximum secondary current for both transformers?

A: Both the FD7-28 and DP-241-7-28 are rated for a maximum secondary output current of 2A at 28V, providing identical load capacity.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the FD7-28 and DP-241-7-28 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.

Q: What termination options are available?

A: Both transformers provide solder and quick connect termination (0.187" / 4.7mm), enabling flexible integration into various circuit board and chassis configurations.

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