ST4-36B26 Equivalent & Substitute Parts

Part Overview

The ST4-36B26 is a 6VA laminated core power transformer manufactured by Pulse Electronics, designed for through-hole mounting applications. This transformer features a single primary winding (115V) and dual secondary windings capable of parallel (18V, 340mA) or series (36V, 170mA) configurations. The component is actively produced and maintains RoHS compliance with 2500Vrms isolation rating, making it suitable for industrial and commercial power supply applications where equivalent alternatives may be required due to inventory constraints, lead time considerations, or design flexibility.

Substiute Parts

ST4-36B26

Pulse ElectronicsIn Stock: 1095ST4-36B26 Datasheet

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3FS-436

TamuraIn Stock: 12763FS-436 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The 3FS-436 manufactured by Tamura qualifies as a direct substitute for the ST4-36B26 based on strict electrical and mechanical parameter equivalence. Substitution eligibility is determined by the following critical parameters:

• Primary voltage: 115V (identical)
• Secondary voltage configuration: Parallel 18V / Series 36V (identical)
• Secondary current capacity: Parallel 340mA / Series 170mA (identical)
• Power rating: 6VA (identical)
• Core type: Laminated (identical)
• Mounting type: Through Hole (identical)
• Termination style: PC Pin (identical)
• Isolation voltage: 2500Vrms (identical)
• RoHS compliance: Yes (identical)
• Product status: Active (identical)

Physical dimensions show minor variations within acceptable tolerances for through-hole mounting applications. Both components maintain equivalent electrical performance and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

Both the ST4-36B26 and 3FS-436 are active production components with full RoHS compliance and equivalent electrical specifications. Selection between these parts should be based on:

• Availability and lead time requirements
• PCB layout constraints, considering the minor dimensional variations (maximum 1.56mm width difference, 1.28mm height difference)
• Preferred supplier relationship or inventory management strategy
• Packaging format preference (ST4-36B26 standard packaging vs. 3FS-436 tube packaging)

Both transformers satisfy identical electrical performance requirements and regulatory compliance standards for 6VA, 115V primary, dual secondary winding applications.

Frequently Asked Questions (FAQ)

Q: Can the 3FS-436 be used as a direct replacement for the ST4-36B26 on existing PCBs?

A: Yes. Both components share identical electrical specifications, mounting type (through hole), and termination style (PC pin). Minor dimensional variations (approximately 1.5mm width and 1.3mm height differences) are within acceptable tolerances for through-hole mounting. PCB layout verification is recommended to confirm clearance around the component footprint.

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

A: No. Both the ST4-36B26 and 3FS-436 maintain identical RoHS compliance status, 2500Vrms isolation rating, and active product status. Both are classified under the same HTSUS code (8504.31.4035) and ECCN (EAR99).

Q: What are the key electrical parameters that define substitution eligibility?

A: Substitution is determined by matching: primary voltage (115V), secondary voltage configuration (parallel 18V / series 36V), secondary current capacity (parallel 340mA / series 170mA), power rating (6VA), core type (laminated), mounting type (through hole), termination style (PC pin), and isolation voltage (2500Vrms).

Q: Does packaging format affect component performance?

A: No. The ST4-36B26 uses standard packaging while the 3FS-436 is supplied in tube packaging. Packaging format does not affect electrical performance or functional characteristics; it impacts only handling, storage, and logistics considerations.

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

A: Yes. Both transformers deliver identical output specifications: 18V at 340mA (parallel configuration) or 36V at 170mA (series configuration) from a 115V primary input, with 6VA maximum power rating.