ST3-24B17 Equivalent & Substitute Parts

Part Overview

The ST3-24B17 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 (12V, 200mA) or series (24V, 100mA) output configurations from a 115V primary input. The component is RoHS compliant, REACH unaffected, and maintains active product status with 991 units in current inventory. Substitute parts are identified to support procurement flexibility, extended lead time mitigation, and supply chain continuity for equivalent electrical and mechanical applications.

Substiute Parts

ST3-24B17

Pulse ElectronicsIn Stock: 1051ST3-24B17 Datasheet

Current PartRFQ

3FS-324

TamuraIn Stock: 70023FS-324 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ST3-24B17 are qualified based on electrical equivalence across the following critical parameters:

• Primary voltage: 115V single winding
• Secondary voltage configuration: Dual winding with parallel 12V/200mA and series 24V/100mA capability
• Power rating: 2.4VA maximum
• Isolation voltage: 2500Vrms
• Mounting and termination: Through hole with PC pin termination
• Regulatory compliance: RoHS compliant, REACH unaffected status

The 3FS-324 manufactured by Tamura meets all electrical specifications and regulatory requirements, establishing direct substitution eligibility. Dimensional variations (length, width, height) are within acceptable tolerances for through-hole PCB mounting applications and do not preclude functional interchangeability.

Parameter Comparison

Engineering Selection Recommendations

Both the ST3-24B17 and 3FS-324 maintain active product status and satisfy identical regulatory compliance requirements (RoHS compliant, REACH unaffected, EAR99 classification). Selection between these parts should be based on:

• Procurement availability and lead time requirements
• Packaging format preference (ST3-24B17 standard packaging versus 3FS-324 tube packaging)
• Inventory levels and supply chain positioning
• PCB layout accommodation for dimensional variations (maximum 0.51mm length difference, 2.30mm width difference, 1.87mm height difference)

Both transformers are electrically and mechanically interchangeable for applications requiring 2.4VA laminated core power transformation with dual secondary winding configuration.

Frequently Asked Questions (FAQ)

Q: Can the 3FS-324 directly replace the ST3-24B17 on existing PCBs?

A: Yes. Both transformers share identical electrical specifications (115V primary, dual secondary with 12V/24V configuration, 2.4VA rating, 2500Vrms isolation) and through-hole PC pin termination. Dimensional differences are minor and do not prevent PCB mounting compatibility.

Q: Are there any compliance differences between these parts?

A: No. Both parts are RoHS compliant, REACH unaffected, and classified as EAR99. Moisture sensitivity level (MSL 1) and isolation voltage ratings are identical.

Q: What is the primary reason to consider the 3FS-324 as a substitute?

A: The 3FS-324 provides supply chain flexibility with higher inventory availability (6900 units versus 991 units for the ST3-24B17) and alternative packaging in tube format, supporting procurement continuity and lead time optimization.

Q: Do the dimensional differences affect circuit performance?

A: No. The dimensional variations between ST3-24B17 (35.05mm L × 28.70mm W × 30.23mm H) and 3FS-324 (35.56mm L × 31.00mm W × 32.10mm H) are within acceptable tolerances for through-hole mounting and do not impact electrical performance or isolation characteristics.

Q: Are both parts suitable for the same voltage and current applications?

A: Yes. Both transformers deliver identical output specifications: parallel configuration (12V, 200mA) or series configuration (24V, 100mA) from a 115V primary input, with 2.4VA maximum power rating.