FBMOV510M Equivalent & Substitute Parts

Part Overview

The FBMOV510M is a 820 V varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in axial cylindrical screw mount configuration. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing system maintenance. The FBMOV510M provides 40 kA surge current capacity with thermally protected operation across -55°C to 85°C temperature range.

Substiute Parts

FBMOV510M

Littelfuse Inc.In Stock: 1158FBMOV510M Datasheet

Current PartRFQ

LST5105VL2NT1

Littelfuse Inc.In Stock: 717LST5105VL2NT1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FBMOV510M is determined by the following critical parameters:

• Voltage Rating: Maximum continuous operating voltage (MCOV) must accommodate the 510 V AC specification
• Surge Current Capacity: Minimum 40 kA discharge capability to maintain protection performance
• Thermal Protection: Feature requirement for safe operation under fault conditions
• RoHS Compliance: ROHS3 compliance required for regulatory alignment
• Operating Temperature: Range must encompass or exceed -55°C to 85°C
• Mounting Configuration: Physical form factor compatibility with system integration

The LST5105VL2NT1 meets these substitution criteria as an active product from Littelfuse Inc. with equivalent voltage protection rating, enhanced surge capacity, and maintained thermal protection features.

Parameter Comparison

Engineering Selection Recommendations

The LST5105VL2NT1 is the manufacturer-recommended substitute for the obsolete FBMOV510M. Both components are manufactured by Littelfuse Inc. and maintain ROHS3 compliance. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

The LST5105VL2NT1 operates within the required 510 V AC voltage specification and includes thermally protected operation. The lower temperature minimum (-40°C versus -55°C) should be evaluated against specific application requirements. The transition from screw mount axial cylinder to through-hole module form factor requires mechanical redesign consideration in the host system.

Frequently Asked Questions (FAQ)

Q: Can the LST5105VL2NT1 directly replace the FBMOV510M without circuit modification?

A: The LST5105VL2NT1 maintains electrical equivalence at the 510 V AC operating voltage with thermally protected operation. However, the mounting type differs (through-hole versus screw mount), requiring mechanical redesign of the mounting interface.

Q: What is the significance of the surge current difference between 40 kA and 20 kA?

A: The FBMOV510M specifies 40 kA surge capacity while the LST5105VL2NT1 specifies 20 kA discharge current at 8/20µS waveform. Application requirements must confirm whether the 20 kA discharge rating is sufficient for the intended transient voltage suppression duty.

Q: Are both parts RoHS compliant?

A: Yes, both the FBMOV510M and LST5105VL2NT1 are ROHS3 compliant, meeting current regulatory requirements for electronic component manufacturing.

Q: Why is the FBMOV510M obsolete?

A: The FBMOV510M is classified as obsolete by the manufacturer. The LST5105VL2NT1 represents the current active product line for equivalent voltage protection applications from Littelfuse Inc.

Q: What is the operating temperature consideration?

A: The FBMOV510M operates from -55°C to 85°C, while the LST5105VL2NT1 operates from -40°C to 85°C. Applications requiring operation below -40°C must evaluate alternative solutions or confirm that the higher minimum temperature is acceptable.