Equivalent & Substitute Parts for 3FL34-340 Laminated Power Transformer

Part Overview

The 3FL34-340 is a 12VA laminated core power transformer manufactured by Tamura, designed for through-hole mounting applications. It features dual primary windings (115V, 230V) and dual secondary windings with parallel (17V, 680mA) and series (34V, 340mA) output configurations. The part is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications requiring compatible electrical and mechanical specifications.

Key Parameters

Parameter	Value
Power Rating	12VA
Primary Voltage	115V, 230V (Dual)
Secondary Voltage (Parallel)	17V
Secondary Voltage (Series)	34V
Output Current - Parallel	680mA
Output Current - Series	340mA
Primary Windings	Dual
Secondary Windings	Dual
Center Tap	No
Mounting Type	Through Hole
Termination Style	PC Pin
Dimensions (L x W)	63.50mm x 50.80mm
Height - Seated (Max)	27.05mm
Isolation Voltage	1500Vrms
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 3FL34-340 are qualified based on strict electrical and mechanical compatibility criteria. All substitute parts must meet the following requirements:

Electrical Compatibility:

Power rating: 12VA
Primary voltage options: 115V, 230V (dual configuration)
Secondary voltage outputs: Parallel 17V and Series 34V
Output current capacity: Parallel 680mA, Series 340mA
Primary and secondary winding configuration: Dual windings
No center tap requirement
Isolation voltage: minimum 1500Vrms

Mechanical Compatibility:

Mounting type: Through Hole
Termination style: PC Pin
Footprint dimensions: 63.50mm L x 50.80mm W
Height seated (max): within acceptable tolerance of 27.05mm

The two qualified substitutes (FP34-340 and LP-34-340) satisfy all electrical parameters and maintain mechanical compatibility with the original 3FL34-340 design.

Parameter Comparison

Parameter	3FL34-340 (Tamura)	FP34-340 (Triad Magnetics)	LP-34-340 (Signal Transformer)
Power Rating	12VA	12VA	12VA
Primary Voltage	115V, 230V	115V, 230V	115V, 230V
Secondary Voltage (Parallel)	17V	17V	17V
Secondary Voltage (Series)	34V	34V	34V
Output Current - Parallel	680mA	680mA	680mA
Output Current - Series	340mA	340mA	340mA
Primary Windings	Dual	Dual	Dual
Secondary Windings	Dual	Dual	Dual
Center Tap	No	No	No
Mounting Type	Through Hole	Through Hole	Through Hole
Termination Style	PC Pin	PC Pin	PC Pin
Dimensions (L x W)	63.50mm x 50.80mm	63.50mm x 50.80mm	63.50mm x 50.80mm
Height - Seated (Max)	27.05mm	26.97mm	27.10mm
Isolation Voltage	1500Vrms	2000Vrms	1500Vrms
Product Status	Obsolete	Active	Active
Core Type	Laminated	Laminated	Semi-Toroidal

Engineering Selection Recommendations

FP34-340 (Triad Magnetics - Flat Pack™ Series)

The FP34-340 is an active product offering enhanced isolation voltage (2000Vrms versus 1500Vrms) and RoHS3 compliance. Height dimension (26.97mm) is within acceptable tolerance of the original specification. This substitute provides superior electrical isolation characteristics and current compliance certifications, making it suitable for applications requiring modern regulatory adherence.

LP-34-340 (Signal Transformer - LP Series)

The LP-34-340 is an active product with semi-toroidal core construction, maintaining the original 1500Vrms isolation voltage specification. Height dimension (27.10mm) is within acceptable tolerance. This substitute provides RoHS3 compliance and REACH unaffected status. The semi-toroidal core design offers alternative magnetic characteristics while preserving all electrical output specifications.

Both substitutes are active products with current manufacturing support, addressing the obsolescence of the original 3FL34-340.

Frequently Asked Questions (FAQ)

Q: Can FP34-340 and LP-34-340 be used interchangeably with 3FL34-340?

A: Both substitutes meet all electrical specifications (12VA, dual primary/secondary windings, 17V parallel and 34V series outputs, 680mA and 340mA current ratings). Mechanical compatibility is confirmed through matching footprint dimensions and through-hole PC pin termination. Core type differs (laminated versus semi-toroidal), which may affect electromagnetic performance characteristics in specific applications.

Q: What is the difference between the laminated core (3FL34-340, FP34-340) and semi-toroidal core (LP-34-340)?

A: Core type is provided in the specifications. Laminated and semi-toroidal cores represent different magnetic core geometries. Selection between these types depends on application-specific requirements not specified in the electrical parameters provided.

Q: Are there compliance differences between the substitutes?

A: FP34-340 and LP-34-340 both carry RoHS3 compliance and REACH unaffected status. The original 3FL34-340 (obsolete) does not list these certifications. FP34-340 provides higher isolation voltage (2000Vrms) compared to both the original part and LP-34-340 (1500Vrms).

Q: Do the height differences affect PCB layout?

A: Height dimensions are 27.05mm (3FL34-340), 26.97mm (FP34-340), and 27.10mm (LP-34-340). Variations are within 0.13mm, which typically falls within standard PCB design tolerances for through-hole components.

Q: What packaging options are available?

A: FP34-340 is supplied in Box packaging. LP-34-340 is supplied in Bulk packaging. Original 3FL34-340 packaging is not specified in available data.

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