V250LA40C Equivalent & Substitute Parts

Part Overview

The V250LA40C is a 390 V varistor manufactured by Littelfuse Inc., designed for transient voltage suppression applications. This through-hole disc component (20mm) provides 10 kA surge current protection with 300 J energy rating across a single circuit. The V250LA40C is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement.

Substiute Parts

V250LA40C

Littelfuse Inc.In Stock: 1236V250LA40C Datasheet

Current PartRFQ

V250LA40CP

Littelfuse Inc.In Stock: 5346V250LA40CP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the V250LA40C is determined by strict equivalence across the following critical parameters:

• Varistor Voltage (Typical): 390 V nominal specification
• Varistor Voltage Tolerance: 351 V minimum to 429 V maximum
• Current - Surge Rating: 10 kA
• Energy Dissipation: 300 J
• Mounting Configuration: Through Hole
• Package Geometry: Disc 20mm
• Circuit Count: Single circuit (1)
• Electrical Characteristics: Capacitance at 1 MHz (7000 pF), Maximum AC Volts (250 V)
• Environmental Specifications: Operating temperature range -55°C to 85°C

The substitute part V250LA40CP maintains identical electrical and mechanical specifications to the obsolete V250LA40C, with the primary distinction being product status (Active vs. Obsolete) and packaging format (Bulk vs. standard).

Parameter Comparison

Engineering Selection Recommendations

The V250LA40CP is the direct substitute for the obsolete V250LA40C. Both components are manufactured by Littelfuse Inc. within the C-III varistor series and maintain identical electrical performance specifications, mechanical dimensions, and environmental ratings.

Selection of V250LA40CP over V250LA40C is justified by:

• Product Status: V250LA40CP carries Active status, ensuring continued availability and manufacturing support
• Regulatory Compliance: Both parts maintain ROHS3 compliance and EAR99 export classification
• Electrical Equivalence: All critical parameters—varistor voltage (390 V typical), surge current (10 kA), energy rating (300 J), and capacitance (7000 pF @ 1 MHz)—are identical
• Mechanical Compatibility: Through-hole mounting and 20mm disc package geometry remain unchanged
• Environmental Specifications: Operating temperature range (-55°C to 85°C) and moisture sensitivity level (MSL 1) are preserved

Frequently Asked Questions (FAQ)

Q: Can V250LA40CP be used as a direct replacement for V250LA40C in existing designs?

A: Yes. The V250LA40CP is electrically and mechanically equivalent to V250LA40C. All critical parameters including varistor voltage (390 V), surge current rating (10 kA), energy dissipation (300 J), and package geometry (Disc 20mm through-hole) are identical. No circuit redesign is required.

Q: What is the primary difference between V250LA40C and V250LA40CP?

A: The V250LA40C is classified as obsolete, while V250LA40CP maintains active product status. Both components are from the Littelfuse C-III series and share identical electrical and mechanical specifications. The packaging format differs (standard vs. bulk), but electrical performance is equivalent.

Q: Are there any compliance or certification differences between these parts?

A: No. Both V250LA40C and V250LA40CP maintain ROHS3 compliance, MSL 1 rating, and EAR99 export classification. Regulatory and environmental certifications are identical.

Q: What parameters must remain constant when selecting a substitute varistor?

A: For the V250LA40C/V250LA40CP family, the following parameters must match: varistor voltage (390 V typical, 351–429 V range), surge current (10 kA), energy rating (300 J), mounting type (through-hole), package geometry (Disc 20mm), circuit count (1), and operating temperature range (-55°C to 85°C).

Q: Is the through-hole mounting configuration identical between both parts?

A: Yes. Both V250LA40C and V250LA40CP use through-hole mounting with a 20mm disc package. PCB footprint and lead configuration are identical.