FBMOV320M Equivalent & Substitute Parts

Part Overview

The FBMOV320M is a 510 V varistor manufactured by Littelfuse, designed for transient voltage suppression in single-circuit applications. This axial cylindrical component features a 40 kA surge current rating and 780 J energy absorption capacity, with screw mount installation. The product is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and new design implementations where similar protection characteristics are required.

Substiute Parts

FBMOV320M

LittelfuseIn Stock: 668FBMOV320M Datasheet

Current PartRFQ

LST3205VL2NT1

Littelfuse Inc.In Stock: 1092LST3205VL2NT1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The LST3205VL2NT1 qualifies as a functional substitute for the FBMOV320M based on the following substitution criteria:

Voltage Protection Alignment: Both components operate within the same voltage protection domain. The FBMOV320M specifies a maximum AC voltage of 320 V and maximum DC voltage of 420 V. The LST3205VL2NT1 provides a continuous operating voltage (MCOV) of 320 VAC, establishing voltage compatibility for equivalent circuit protection.

Surge Current Capacity: The FBMOV320M handles 40 kA surge current. The LST3205VL2NT1 provides a discharge current rating of 20 kA (8/20 µS) with a short circuit rating of 200 kA, demonstrating adequate surge protection capability within the same application class.

Single-Circuit Configuration: Both components are single-circuit devices designed for point-of-use transient voltage suppression.

Thermal Protection: Both incorporate thermally protected design, ensuring safe operation under fault conditions.

Compliance and Availability: The LST3205VL2NT1 maintains ROHS3 compliance and active product status with current inventory availability, addressing the obsolescence of the FBMOV320M.

Key Substitution Parameters: Maximum AC/DC voltage rating, surge current capacity, number of circuits, thermal protection features, and RoHS compliance status.

Parameter Comparison

Engineering Selection Recommendations

The LST3205VL2NT1 is the manufacturer-recommended substitute for the obsolete FBMOV320M. Selection of this alternative is supported by:

Product Status: The FBMOV320M is classified as obsolete, creating supply chain risk. The LST3205VL2NT1 maintains active product status with documented inventory availability, ensuring long-term procurement viability.

Regulatory Compliance: Both components achieve ROHS3 compliance, satisfying environmental and regulatory requirements for electronic component use in regulated markets.

Manufacturer Endorsement: Littelfuse Inc. has designated the LST3205VL2NT1 as the recommended substitute, indicating engineering validation of functional equivalence within the manufacturer's product portfolio.

Thermal Management: Both components incorporate thermally protected design, maintaining safety margins under transient overvoltage conditions.

Moisture Sensitivity: Both components specify MSL 1 (Unlimited), indicating robust moisture resistance suitable for standard storage and handling conditions.

Frequently Asked Questions (FAQ)

Q: Can the LST3205VL2NT1 directly replace the FBMOV320M in existing designs?

A: The LST3205VL2NT1 provides functional voltage and surge protection equivalence. However, mounting type differs: the FBMOV320M uses screw mount while the LST3205VL2NT1 uses through-hole mounting. PCB layout and mechanical assembly modifications are required.

Q: What is the difference in surge current handling between these components?

A: The FBMOV320M specifies 40 kA surge current capacity. The LST3205VL2NT1 provides 20 kA discharge current (8/20 µS) with 200 kA short circuit rating. Application-specific surge profiles determine adequacy for your circuit protection requirements.

Q: Are both components suitable for the same voltage protection range?

A: Both components operate at 320 V maximum AC voltage. The FBMOV320M specifies 420 V maximum DC voltage; the LST3205VL2NT1 specifies 1 kV protection rating. Voltage compatibility is established for standard 320 V AC applications.

Q: What temperature range considerations apply to substitution?

A: The FBMOV320M operates from -55°C to 85°C. The LST3205VL2NT1 operates from -40°C to 85°C. Applications requiring operation below -40°C require evaluation of alternative solutions.

Q: Are there packaging or inventory considerations for this substitution?

A: The LST3205VL2NT1 is supplied in tray packaging with 1001 pieces currently in stock. The FBMOV320M is obsolete with limited remaining inventory (613 pieces). The active product status of the LST3205VL2NT1 supports ongoing procurement requirements.

Q: Do both components meet the same regulatory standards?

A: Both components achieve ROHS3 compliance and MSL 1 moisture sensitivity rating. The LST3205VL2NT1 includes UL approval agency certification. Both components carry EAR99 ECCN classification.