ST3-48B29 Equivalent & Substitute Parts

Part Overview

The ST3-48B29 is a laminated core power transformer manufactured by Pulse Electronics, designed for through-hole mounting applications. This split bobbin plug-in transformer delivers 2.4VA of power with dual secondary windings capable of parallel (24V, 100mA) or series (48V, 50mA) output configurations from a 115V primary input. The component is actively produced and maintains RoHS compliance with unlimited moisture sensitivity rating. Substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for equivalent electrical and mechanical requirements.

Substiute Parts

ST3-48B29

Pulse ElectronicsIn Stock: 719ST3-48B29 Datasheet

Current PartRFQ

3FS-348

TamuraIn Stock: 11023FS-348 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ST3-48B29 is determined by strict equivalence across the following critical parameters:

• Primary voltage: 115V
• Secondary voltage configuration: Parallel 24V / Series 48V
• Secondary current capacity: Parallel 100mA / Series 50mA
• Power rating: 2.4VA
• Winding configuration: Single primary, dual secondary, no center tap
• Isolation voltage: 2500Vrms
• Mounting type: Through hole with PC pin termination
• Core type: Laminated
• Compliance: RoHS compliant, MSL 1

The 3FS-348 manufactured by Tamura meets all electrical and mechanical substitution criteria. Dimensional variations (length, width, height) fall within acceptable tolerances for through-hole mounting applications and do not affect functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the ST3-48B29 and 3FS-348 are active production components with full RoHS compliance and unlimited moisture sensitivity ratings. Selection between these parts should be based on:

• Availability and lead time requirements
• Packaging format preference (ST3-48B29 supplied in standard packaging; 3FS-348 supplied in tube)
• Procurement source and cost considerations
• PCB layout accommodation for dimensional tolerances

No electrical performance degradation occurs with either selection. Both transformers satisfy identical isolation voltage, power delivery, and winding configuration requirements.

Frequently Asked Questions (FAQ)

Q: Can the 3FS-348 be used as a direct replacement for the ST3-48B29 in existing designs?

A: Yes. Both transformers deliver identical electrical specifications: 2.4VA power, 115V primary input, dual secondary windings with 24V/100mA parallel or 48V/50mA series output, and 2500Vrms isolation. Dimensional differences (approximately 0.5mm length, 2.3mm width, 1.87mm height) are within acceptable tolerances for through-hole mounting on standard PCB layouts.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the ST3-48B29 and 3FS-348 are RoHS compliant, carry MSL 1 (unlimited) moisture sensitivity ratings, and maintain active production status.

Q: What is the significance of the dual secondary winding configuration?

A: The dual secondary windings allow flexible output voltage selection. When connected in parallel, the transformer delivers 24V at 100mA. When connected in series, it delivers 48V at 50mA. Both configurations maintain the 2.4VA power rating. Circuit design determines which configuration is appropriate for the application.

Q: Does packaging format affect electrical performance?

A: No. The ST3-48B29 standard packaging and 3FS-348 tube packaging contain identical electrical components. Packaging format affects only handling, storage, and procurement logistics.

Q: Are there any thermal or environmental performance differences?

A: Both transformers are rated for MSL 1 (unlimited moisture sensitivity), indicating equivalent environmental performance. No thermal performance data is provided in the specifications; both are suitable for standard industrial operating environments.