Equivalent & Substitute Parts for 3FL30-400

Part Overview

The 3FL30-400 is a 12VA laminated core power transformer manufactured by Tamura, designed for through-hole mounting applications. This transformer features dual primary and secondary windings with selectable voltage configurations (115V or 230V primary input; 17V parallel or 34V series secondary output). The part is currently active in production with 835 units in stock.

Substitute parts are necessary when original inventory becomes unavailable, when alternative packaging formats are required, or when design revisions call for different core construction types while maintaining equivalent electrical performance.

Substiute Parts

3FL30-400

TamuraIn Stock: 8533FL30-400 Datasheet

Current PartRFQ

FP30-400

Triad MagneticsIn Stock: 1136FP30-400 Datasheet

DirectRFQ

LP-30-400

Signal TransformerIn Stock: 1078LP-30-400 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3FL30-400 is determined by the following criteria:

Mandatory Matching Parameters:

• Power rating: 12VA
• Primary voltage options: 115V, 230V
• Primary winding configuration: Dual
• Secondary winding configuration: Dual
• Mounting type: Through Hole
• Termination style: PC Pin
• Center tap: None

Allowable Variations:

• Secondary voltage output: Substitute parts may provide 15V parallel / 30V series (within acceptable tolerance for dual-winding transformer designs)
• Core type: Laminated or semi-toroidal construction acceptable
• Isolation voltage: Equal to or greater than 1500Vrms
• Packaging format: Bulk or box acceptable
• Compliance level: RoHS or ROHS3 acceptable

Identified Substitutes:

• FP30-400 (Triad Magnetics, Flat Pack™ series, laminated core)
• LP-30-400 (Signal Transformer, LP series, semi-toroidal core)

Parameter Comparison

Engineering Selection Recommendations

3FL30-400 (Tamura): Select this part when original design specifications require laminated core construction with 17V/34V secondary output and RoHS compliance is the primary regulatory requirement. This part maintains the original design intent and is currently in active production.

FP30-400 (Triad Magnetics): This substitute is suitable when higher isolation voltage (2000Vrms versus 1500Vrms) is beneficial for the application and when laminated core construction is required. The secondary voltage output is 15V/30V, which represents a 2V reduction in parallel mode and 4V reduction in series mode compared to the original. ROHS3 compliance provides enhanced environmental standards. Packaging is supplied in box format rather than bulk.

LP-30-400 (Signal Transformer): This substitute is suitable when semi-toroidal core construction is acceptable and when bulk packaging is preferred. The secondary voltage output is 15V/30V, matching the FP30-400. Isolation voltage remains at 1500Vrms. ROHS3 compliance is provided. Height dimension is marginally higher at 27.10mm versus 27.05mm for the original part.

All three parts share identical footprint dimensions (63.50mm L x 50.80mm W), identical through-hole mounting and PC pin termination, and identical power rating and current specifications. Selection should be based on secondary voltage tolerance requirements, core type preference, and packaging format needs.

Frequently Asked Questions (FAQ)

Q: Can FP30-400 or LP-30-400 be used as direct replacements for 3FL30-400 in existing designs?

A: Both parts are electrically compatible substitutes provided the application tolerates a 2V reduction in parallel secondary voltage (17V to 15V) and a 4V reduction in series secondary voltage (34V to 30V). The power rating, current capacity, primary voltage options, winding configuration, and mounting characteristics are identical. Verify that the secondary voltage reduction does not affect circuit performance before implementation.

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

A: Laminated cores (3FL30-400 and FP30-400) use stacked steel laminations. Semi-toroidal cores (LP-30-400) use a toroidal geometry with semi-toroidal winding. Both construction types are acceptable substitutes based on the provided parameters. Core type selection depends on application-specific requirements such as EMI characteristics, thermal performance, or mechanical constraints not specified in this reference.

Q: Are there packaging differences between these parts?

A: Yes. The 3FL30-400 and LP-30-400 are supplied in bulk packaging, while the FP30-400 is supplied in box packaging. Bulk packaging typically indicates loose components, while box packaging indicates individual component packaging. Verify procurement and handling requirements for your supply chain.

Q: Does the higher isolation voltage of FP30-400 (2000Vrms) affect compatibility?

A: No. Higher isolation voltage is a superset of the original specification (1500Vrms) and does not create compatibility issues. The FP30-400 meets or exceeds all isolation requirements of the original design.

Q: What is the significance of ROHS3 compliance versus RoHS compliance?

A: ROHS3 represents a more recent version of the RoHS directive with updated substance restrictions. Both compliance levels are acceptable for substitution purposes. ROHS3 compliance indicates the part meets current environmental standards.

Q: Are the height differences between parts significant?

A: The height variations are minimal (3FL30-400: 27.05mm, FP30-400: 26.97mm, LP-30-400: 27.10mm). These differences are within typical PCB design tolerances and should not affect board layout or clearance requirements. Verify clearance in your specific application if height-constrained mounting is a concern.

Q: Can these parts be used interchangeably in parallel or series winding configurations?

A: Yes. All three parts support both parallel (800mA output) and series (400mA output) winding configurations. The secondary voltage outputs differ between the original and substitutes, but the configuration flexibility remains identical.