ST3-10B1 Equivalent & Substitute Parts

Part Overview

The ST3-10B1 is a laminated core power transformer manufactured by Pulse Electronics, rated at 2.4VA with a 115V primary voltage and dual secondary windings capable of 5V parallel or 10V series output configurations. This through-hole mounted component is designed for applications requiring isolated power conversion with dual output flexibility. The part is currently active in production with full RoHS compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers.

Substiute Parts

ST3-10B1

Pulse ElectronicsIn Stock: 1036ST3-10B1 Datasheet

Current PartRFQ

3FS-310

TamuraIn Stock: 21363FS-310 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ST3-10B1 are qualified based on the following critical parameters that determine functional and mechanical interchangeability:

• Electrical Specifications: Primary voltage (115V), secondary voltage configuration (5V parallel / 10V series), secondary current capacity (500mA parallel / 250mA series), and power rating (2.4VA) must be identical.
• Winding Configuration: Single primary winding and dual secondary winding structure must be maintained.
• Core Type: Laminated core construction is required.
• Mounting and Termination: Through-hole mounting with PC pin termination ensures PCB compatibility.
• Isolation Rating: 2500Vrms isolation voltage must be met or exceeded.
• Regulatory Compliance: RoHS compliance and active product status are mandatory for production applications.

The 3FS-310 manufactured by Tamura meets all these criteria and is classified as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the ST3-10B1 and 3FS-310 are active production components with full RoHS compliance and identical electrical specifications. Selection between these parts should be based on:

• Availability and Lead Time: Verify current inventory status with suppliers, as stock levels vary.
• Packaging Format: ST3-10B1 is supplied in standard packaging; 3FS-310 is supplied in tube packaging. Confirm packaging compatibility with assembly processes.
• Mechanical Fit: While dimensional tolerances are within acceptable ranges for through-hole mounting, verify PCB layout clearances for the 3FS-310, which has slightly larger width and height dimensions.
• Supply Chain Continuity: Both manufacturers maintain active product status, ensuring long-term availability for production applications.

Frequently Asked Questions (FAQ)

Q: Can the 3FS-310 be used as a direct replacement for the ST3-10B1 in existing designs?

A: Yes. Both parts share identical electrical specifications (2.4VA, 115V primary, 5V/10V secondary, 500mA/250mA output), core type (laminated), winding configuration (single primary, dual secondary), mounting method (through-hole), and termination style (PC pin). Dimensional differences are within acceptable tolerances for through-hole PCB mounting.

Q: Are there any compliance differences between these parts?

A: No. Both the ST3-10B1 and 3FS-310 are RoHS compliant, carry identical isolation ratings (2500Vrms), and maintain active product status. Both are suitable for production applications with equivalent regulatory standing.

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

A: The dual secondary winding allows flexible output voltage selection: 5V at 500mA when windings are connected in parallel, or 10V at 250mA when connected in series. Both substitute parts maintain this identical configuration.

Q: How do the physical dimensions affect substitution?

A: The 3FS-310 is slightly larger (35.56mm L × 31.00mm W × 32.10mm H) compared to the ST3-10B1 (35.05mm L × 28.70mm W × 30.23mm H). For through-hole mounting applications, these differences are typically within PCB layout tolerances. Verify clearances in your specific board design before substitution.

Q: What packaging considerations apply to these parts?

A: The ST3-10B1 uses standard packaging, while the 3FS-310 is supplied in tube packaging. Confirm that your assembly process and component handling equipment are compatible with the selected packaging format.