LF-320 Line Filter Equivalent & Substitute Parts

Part Overview

The KEMET LF-320 is a three-phase delta EMC/EMI line filter rated for 250VDC/VAC at 20A with chassis mount configuration and threaded post (M4) termination. This component is designated as Last Time Buy, indicating discontinued production status. Identification of equivalent and substitute parts is necessary to support ongoing system maintenance, design updates, and procurement continuity for applications requiring three-phase line filtering in general-purpose installations.

Substiute Parts

LF-320

KEMETIn Stock: 1232LF-320 Datasheet

Current PartRFQ

GTX-3300-Y103

KEMETIn Stock: 1179GTX-3300-Y103 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LF-320 is determined by the following critical parameters:

Filter Architecture: Both the main part and substitute maintain three-phase delta configuration with two-stage topology, ensuring equivalent EMC/EMI filtering performance characteristics.

Voltage and Current Ratings: The substitute part GTX-3300-Y103 operates at higher voltage (500VDC) and current (30A) specifications, establishing an uprated substitution path suitable for applications where the LF-320 operates below maximum ratings.

Mounting and Termination: Both components feature chassis mount configuration. The LF-320 uses threaded post (M4) termination while the GTX-3300-Y103 uses terminal block termination, requiring mechanical interface adaptation during substitution.

Compliance and Status: The substitute part maintains ROHS3 compliance and carries active product status with established certifications (cUL, UL), providing long-term availability and regulatory continuity.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: The GTX-3300-Y103 serves as the manufacturer-recommended substitute for the LF-320. Both components share identical filter topology (three-phase delta, two-stage configuration) and chassis mount architecture. The GTX-3300-Y103 provides higher voltage and current ratings, establishing compatibility for applications operating within the LF-320 specifications.

Compliance Considerations: The GTX-3300-Y103 carries active product status with established cUL and UL certifications, ensuring regulatory compliance and long-term supply availability. The LF-320 Last Time Buy status necessitates transition planning to the GTX-3300-Y103 for new designs and ongoing procurement.

Termination Interface: Mechanical adaptation is required due to termination style differences. The LF-320 threaded post (M4) termination differs from the GTX-3300-Y103 terminal block configuration. System integration must account for this interface change during component substitution.

Environmental Specifications: The GTX-3300-Y103 extends the lower operating temperature limit to -25°C compared to the LF-320 at -20°C, providing enhanced thermal performance across the specified operating range.

Frequently Asked Questions (FAQ)

Q: Can the GTX-3300-Y103 directly replace the LF-320 without circuit modification?

A: The GTX-3300-Y103 maintains electrical compatibility within the LF-320 operating envelope due to higher voltage and current ratings. Mechanical interface adaptation is required due to termination style differences (threaded post M4 versus terminal block).

Q: What is the significance of the LF-320 Last Time Buy status?

A: Last Time Buy designation indicates discontinued production. The GTX-3300-Y103 is the manufacturer-recommended active substitute, ensuring continued availability and regulatory compliance for future procurement and system maintenance.

Q: Are both parts RoHS3 compliant?

A: Yes, both the LF-320 and GTX-3300-Y103 are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing.

Q: What are the key electrical differences between these parts?

A: The GTX-3300-Y103 is rated for 500VDC and 30A compared to the LF-320 at 250VDC/VAC and 20A. Both maintain three-phase delta, two-stage filter configuration. The higher ratings of the GTX-3300-Y103 establish uprated substitution capability.

Q: Does the operating frequency specification affect substitution?

A: The GTX-3300-Y103 specifies 50/60Hz operating frequency. The LF-320 operating frequency is not specified in the provided parameters. Both components are suitable for standard industrial power distribution applications within their respective voltage and current ratings.

Q: What certifications does the GTX-3300-Y103 carry?

A: The GTX-3300-Y103 holds cUL and UL certifications, providing recognized safety and performance validation for industrial applications. The LF-320 approval agency information is not specified in the provided parameters.