Equivalent & Substitute Parts for V18ZC3

Part Overview

The V18ZC3 is an 18 V, 1 kA Transient Voltage Suppressor (TVS) varistor manufactured by Littelfuse Inc. in a through-hole disc package (14mm). This component is designed for transient voltage protection in electronic circuits with a nominal varistor voltage of 18 V and energy absorption capability of 4.6 J.

The V18ZC3 has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

V18ZC3

Littelfuse Inc.In Stock: 1198V18ZC3 Datasheet

Current PartRFQ

V18ZC3P

Littelfuse Inc.In Stock: 862V18ZC3P Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the V18ZC3 is determined by strict equivalence across the following critical electrical and mechanical parameters:

• Varistor voltage rating (nominal 18 V, within 16.2 V – 19.8 V range)
• Surge current capacity (1 kA minimum)
• Energy absorption (4.6 J minimum)
• Maximum DC and AC voltage ratings (14 V DC, 10 V AC)
• Mounting configuration (through-hole, disc 14mm package)
• Operating temperature range (-55°C to 85°C)
• Single-circuit configuration
• Capacitance characteristics (18870 pF @ 1 MHz)

The V18ZC3P meets all these criteria and is classified as a direct substitute. The primary distinction between the V18ZC3 and V18ZC3P is product status (obsolete versus active) and packaging format (unspecified versus bulk), with all electrical and mechanical specifications remaining identical.

Parameter Comparison

Engineering Selection Recommendations

The V18ZC3P is the direct equivalent substitute for the V18ZC3. Both components are manufactured by Littelfuse Inc. within the ZC series and maintain identical electrical specifications and mechanical form factors.

Selection of V18ZC3P over V18ZC3 is supported by the following factors:

• V18ZC3P maintains active product status, ensuring continued availability and manufacturing support
• Both components are ROHS3 compliant, meeting environmental regulatory requirements
• Moisture sensitivity level (MSL 1) is identical, indicating no additional handling or storage constraints
• Electrical performance, thermal operating range, and surge current capacity are fully equivalent
• Through-hole mounting configuration and 14mm disc package dimensions are unchanged

The V18ZC3P is suitable for direct replacement in applications originally designed for the V18ZC3 without circuit redesign or performance degradation.

Frequently Asked Questions (FAQ)

Q: Can V18ZC3P be used as a direct replacement for V18ZC3 in existing designs?

A: Yes. The V18ZC3P is electrically and mechanically equivalent to the V18ZC3. All critical parameters including varistor voltage (18 V nominal), surge current (1 kA), energy absorption (4.6 J), and package dimensions (14mm disc) are identical. Direct substitution is supported without circuit modification.

Q: What is the primary difference between V18ZC3 and V18ZC3P?

A: The V18ZC3 is classified as obsolete, while V18ZC3P maintains active product status. Packaging format differs (unspecified for V18ZC3 versus bulk for V18ZC3P), but all electrical and mechanical specifications remain identical.

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

A: No. Both V18ZC3 and V18ZC3P are ROHS3 compliant and carry identical moisture sensitivity level (MSL 1) ratings. Regulatory compliance and handling requirements are equivalent.

Q: What parameters determine substitution eligibility for this varistor?

A: Substitution is determined by equivalence in varistor voltage rating (18 V nominal, 16.2 V – 19.8 V range), surge current capacity (1 kA), energy absorption (4.6 J), maximum voltage ratings (14 V DC, 10 V AC), operating temperature range (-55°C to 85°C), mounting type (through-hole), and package form (disc 14mm). All these parameters must match for functional equivalence.

Q: Is the 14mm disc package dimension critical for mechanical fit?

A: Yes. The 14mm disc package dimension is a critical mechanical parameter for through-hole mounting. Any substitute must maintain this package specification to ensure proper PCB fit and mounting compatibility.

Q: What is the operating temperature range for both parts?

A: Both V18ZC3 and V18ZC3P operate across the temperature range of -55°C to 85°C (TA). This specification is identical for both components.