Signal Transformer 241-4-28 Equivalent & Substitute Parts

Part Overview

The Signal Transformer 241-4-28 is a laminated core power transformer rated at 6VA with a 115V primary and 28V secondary output. This chassis-mounted transformer is designed for applications requiring isolated 28V power delivery at up to 200mA output current. The part is currently active in production with full RoHS3 compliance and 2500Vrms isolation rating. Substitute parts may be required due to inventory constraints, application-specific mounting requirements, or performance envelope adjustments within compatible electrical specifications.

Substiute Parts

241-4-28

Signal TransformerIn Stock: 1118241-4-28 Datasheet

Current PartRFQ

186C28

Hammond ManufacturingIn Stock: 892186C28 Datasheet

DirectRFQ

F4-28

Triad MagneticsIn Stock: 839F4-28 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 241-4-28 is determined by the following critical parameters:

• Secondary Voltage Output: Must be 28V at full load
• Primary Input Voltage: Must support 115V operation
• Output Current Capacity: Minimum 200mA at rated secondary voltage
• Power Rating: Minimum 6VA
• Mounting Configuration: Chassis mount with compatible termination
• Core Type: Laminated core construction
• Center Tap: Required on secondary winding
• Isolation Voltage: Minimum 2000Vrms
• Compliance: RoHS3 compliant, REACH unaffected

Two substitute parts meet these criteria with allowable parameter variations within the electrical and mechanical envelope.

Parameter Comparison

Engineering Selection Recommendations

241-4-28 (Signal Transformer): Primary selection for applications requiring exact 6VA power envelope with 115V single primary input and 200mA maximum output current. Maintains 2500Vrms isolation specification. Active production status with full inventory availability.

F4-28 (Triad Magnetics): Direct electrical equivalent with identical power rating, primary voltage, secondary voltage, and output current specifications. Maintains 2500VAC isolation voltage. Packaging differs (Bulk vs. Bulk). Termination connector size specified at 0.187" (4.7mm). Active production status with confirmed inventory.

186C28 (Hammond Manufacturing): Acceptable substitute for applications where increased power capacity (12VA) and higher output current (420mA) provide design margin. Dual primary winding enables 115V/230V operation, expanding application flexibility. Isolation voltage reduced to 2000Vrms. Larger physical footprint. Active production status with inventory availability.

All three parts maintain RoHS3 compliance and REACH unaffected status, meeting current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the 186C28 replace the 241-4-28 in all applications?

A: The 186C28 is electrically compatible for applications requiring 28V secondary output at up to 200mA. The higher power rating (12VA vs. 6VA) and increased output current capacity (420mA vs. 200mA) do not create incompatibility. However, the reduced isolation voltage (2000Vrms vs. 2500Vrms) and larger physical dimensions must be verified against specific application requirements. The dual primary winding provides additional flexibility for 230V operation if needed.

Q: Is the F4-28 a direct replacement for the 241-4-28?

A: Yes. The F4-28 matches all critical electrical parameters: 115V primary, 28V secondary, 200mA output current, and 6VA power rating. Both maintain 2500V isolation voltage. The primary difference is termination connector specification (0.187" quick connect on F4-28). Verify connector compatibility with existing harnesses before substitution.

Q: What are the physical dimension differences between these parts?

A: The 241-4-28 measures 60.30mm L × 33.30mm W × 36.20mm H (seated). The F4-28 is nearly identical at 60.33mm L × 31.75mm W × 34.93mm H. The 186C28 is larger at 71.37mm L × 43.82mm W × 41.15mm H due to its higher power rating and dual primary winding. Verify chassis mounting clearance before selecting the 186C28.

Q: Are all three parts RoHS3 compliant?

A: Yes. The 241-4-28, F4-28, and 186C28 are all RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: What is the significance of the center tap on the secondary winding?

A: All three parts include a center-tapped secondary winding, enabling 14V output from center tap to either end, or 28V across the full secondary. This configuration supports applications requiring dual-polarity or reduced voltage operation.

Q: Which substitute should be selected for new designs?

A: For new designs matching the 241-4-28 electrical envelope, the F4-28 provides direct equivalence with identical specifications. The 186C28 is appropriate when design margins for power capacity and output current are beneficial, provided isolation voltage and physical dimensions are acceptable.