FN258P-75-34 Equivalent & Substitute Parts

Part Overview

The FN258P-75-34 is a three-phase delta EMC/EMI line filter rated for 75 A with a two-stage configuration and chassis mount termination. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. For new applications or replacement inventory, equivalent substitute parts with compatible electrical and mechanical specifications are necessary to maintain system performance and regulatory compliance.

Substiute Parts

FN258P-75-34

Schaffner EMC Inc.In Stock: 1125FN258P-75-34 Datasheet

Current PartRFQ

FN3288-80-34-C35-R65

Schaffner EMC Inc.In Stock: 1070FN3288-80-34-C35-R65 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FN258P-75-34 is based on the following critical parameters:

• Filter Type & Configuration: Three-phase delta, two-stage topology must be maintained for EMC/EMI performance equivalence
• Current Rating: Substitute must meet or exceed 75 A rating
• Voltage Specifications: Phase-to-ground and phase-to-phase voltage ratings must be compatible with the original 277 V / 480 V specification
• Mounting & Termination: Chassis mount with terminal block connection must be preserved for mechanical compatibility
• Operating Frequency: DC ~ 60Hz operating range must be supported
• Regulatory Compliance: RoHS3 compliance and approval agency certifications (CSA, ENEC, UR) ensure continued regulatory acceptance

The FN3288-80-34-C35-R65 qualifies as a substitute based on these parameters: it maintains three-phase delta configuration, two-stage design, chassis mount with terminal block, and operates within the required frequency range. The higher current rating (80 A) and extended voltage specification (305 V / 530 V) provide operational margin while remaining compatible with the original application requirements.

Parameter Comparison

Engineering Selection Recommendations

The FN3288-80-34-C35-R65 is the designated substitute for the FN258P-75-34 based on the following engineering criteria:

• Regulatory Compliance: Both parts maintain ROHS3 compliance and are manufactured by Schaffner EMC Inc., ensuring consistent quality and certification standards
• Product Status: The FN258P-75-34 is classified as "Not For New Designs." The FN3288-80-34-C35-R65 carries Active status, making it the appropriate choice for new applications and ongoing production
• Electrical Equivalence: The substitute provides higher current (80 A vs. 75 A) and voltage ratings (305 V / 530 V vs. 277 V / 480 V), ensuring compatibility with the original application while providing operational margin
• Mechanical Compatibility: Identical mounting type (chassis mount) and termination style (terminal block) ensure direct physical compatibility without redesign
• Thermal Performance: Extended operating temperature range (-40°C to 100°C vs. -25°C to 100°C) provides enhanced reliability in demanding environments

Frequently Asked Questions (FAQ)

Q: Can the FN3288-80-34-C35-R65 be used as a direct replacement for the FN258P-75-34?

A: Yes. Both parts share identical filter topology (three-phase delta, two-stage), mounting configuration (chassis mount), and termination style (terminal block). The substitute's higher current and voltage ratings are compatible with applications designed for the original part.

Q: What is the significance of the higher current rating (80 A vs. 75 A)?

A: The substitute's 80 A rating exceeds the original 75 A specification, providing operational margin and enhanced reliability. This does not create incompatibility; it ensures the substitute can handle the original application's current demands with additional capacity.

Q: Are the voltage specifications compatible?

A: Yes. The substitute's phase-to-ground voltage (305 V) and phase-to-phase voltage (530 V) are higher than the original (277 V / 480 V). This higher rating ensures compatibility with the original application while providing voltage margin for system stability.

Q: Why is the FN258P-75-34 marked "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status. For new applications, the FN3288-80-34-C35-R65 (Active status) is the recommended choice to ensure long-term availability and continued manufacturer support.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the FN258P-75-34 and FN3288-80-34-C35-R65 are ROHS3 compliant, meeting environmental and regulatory requirements for electronic components.

Q: What is the difference in operating temperature range?

A: The substitute operates from -40°C to 100°C, compared to the original's -25°C to 100°C. This extended low-temperature range provides enhanced performance in cold environments without affecting compatibility with the original application.

Q: Are there any packaging differences?

A: Both parts are supplied in Tray packaging, maintaining consistency in handling, storage, and integration into production workflows.