3FL10-250 Equivalent & Substitute Parts

Part Overview

The 3FL10-250 is a laminated core power transformer manufactured by Tamura, rated at 2.5VA with through-hole mounting. This transformer features dual primary windings (115V, 230V) and dual secondary windings (Parallel 5V/500mA, Series 10V/250mA), providing flexible voltage and current configurations for industrial and commercial applications. The part is currently active in production with RoHS compliance and 1500Vrms isolation rating. Equivalent substitute parts are identified based on matching electrical specifications, mechanical dimensions, mounting characteristics, and compliance certifications to ensure direct functional replacement in circuit designs.

Substiute Parts

3FL10-250

TamuraIn Stock: 7653FL10-250 Datasheet

Current PartRFQ

FP10-250

Triad MagneticsIn Stock: 1097FP10-250 Datasheet

DirectRFQ

LP-10-250

Signal TransformerIn Stock: 241337LP-10-250 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3FL10-250 are qualified based on the following critical parameters that determine functional equivalence:

Electrical Compatibility Criteria:

• Primary voltage configuration: 115V, 230V dual winding
• Secondary voltage output: Parallel 5V and Series 10V capability
• Output current ratings: Parallel 500mA and Series 250mA
• Power rating: 2.5VA nominal
• Isolation voltage: Minimum 1500Vrms

Mechanical Compatibility Criteria:

• Mounting type: Through Hole
• Termination style: PC Pin
• Physical dimensions: Approximately 47.60mm L x 39.60mm W x 16.80mm H (seated)
• Core construction: Laminated or Semi-Toroidal

Compliance Criteria:

• RoHS compliance status
• ECCN and HTSUS classification alignment
• Product status: Active

The identified substitutes (FP10-250 and LP-10-250) meet all electrical output specifications and mechanical mounting requirements, with minor dimensional variations within acceptable tolerances for through-hole PCB applications.

Parameter Comparison

Engineering Selection Recommendations

FP10-250 (Triad Magnetics): This substitute provides identical electrical specifications to the 3FL10-250 with enhanced isolation voltage (2000Vrms versus 1500Vrms), offering additional safety margin in high-voltage isolation applications. Physical dimensions are within 0.03mm tolerance on length and width, with 0.29mm reduction in seated height. ROHS3 compliance exceeds the base RoHS requirement. This part is suitable for direct replacement where enhanced isolation performance is beneficial or required.

LP-10-250 (Signal Transformer): This substitute meets all electrical output requirements with a semi-toroidal core construction instead of laminated. Power rating is specified as 2VA (versus 2.5VA), representing a 0.5VA reduction in rated capacity. Physical dimensions are within acceptable tolerance (0.10mm length variation, identical width, 0.30mm height reduction). ROHS3 compliance and identical ECCN/HTSUS classification confirm regulatory alignment. This part is suitable for applications where the 2VA rating is sufficient and semi-toroidal construction is acceptable.

Both substitutes are active products with current manufacturing status and full compliance certifications, ensuring long-term availability and supply chain reliability.

Frequently Asked Questions (FAQ)

Q: Can FP10-250 and LP-10-250 be used interchangeably with 3FL10-250?

A: Both parts provide equivalent secondary voltage and current outputs (Parallel 5V/500mA, Series 10V/250mA) with matching primary voltage configuration (115V, 230V dual winding). Physical dimensions are within tolerance for through-hole PCB mounting. FP10-250 is a direct electrical equivalent with enhanced isolation. LP-10-250 meets output specifications but has a lower power rating (2VA versus 2.5VA) and different core construction (semi-toroidal versus laminated).

Q: What is the significance of the power rating difference between 3FL10-250 (2.5VA) and LP-10-250 (2VA)?

A: The power rating indicates the maximum apparent power the transformer can handle. The 3FL10-250 is rated for 2.5VA, while LP-10-250 is rated for 2VA. Both deliver identical secondary voltage and current specifications. The LP-10-250 should be selected only when the application load does not exceed 2VA continuous operation.

Q: Are there dimensional differences that affect PCB layout?

A: All three parts have through-hole mounting with PC pin termination and similar footprints. Length variations are within 0.10mm (47.50-47.63mm range), width variations are within 0.07mm (39.60-39.67mm range), and height variations are within 0.30mm (16.50-16.80mm range). These tolerances are standard for through-hole component placement and do not require PCB redesign.

Q: What is the difference between laminated and semi-toroidal core construction?

A: Laminated cores (3FL10-250, FP10-250) use stacked steel laminations, while semi-toroidal cores (LP-10-250) use a partially wound toroidal design. Both constructions provide adequate magnetic coupling for the specified electrical performance. Core type selection depends on application-specific requirements for EMI characteristics, efficiency, and thermal performance.

Q: Does the higher isolation voltage of FP10-250 (2000Vrms) provide additional benefits?

A: FP10-250 provides 2000Vrms isolation compared to 1500Vrms for 3FL10-250 and LP-10-250. This higher isolation rating offers increased safety margin in applications requiring high-voltage isolation or operating in harsh electrical environments. It does not affect the secondary output specifications but provides enhanced dielectric protection.

Q: Are all three parts RoHS compliant?

A: Yes. 3FL10-250 is RoHS Compliant. FP10-250 and LP-10-250 are ROHS3 Compliant, which represents an updated compliance standard. All three parts meet RoHS requirements and are suitable for applications with RoHS mandates.

Q: What packaging differences exist between these parts?

A: 3FL10-250 and LP-10-250 are supplied in Bulk packaging. FP10-250 is supplied in Box packaging. Packaging type does not affect electrical or mechanical performance and is determined by supplier inventory and distribution requirements.