V300LA40AP Equivalent & Substitute Parts

Part Overview

The V300LA40AP is a 470 V, 6.5 kA varistor manufactured by Littelfuse Inc. in the LA series. This through-hole disc varistor (20mm) is designed for transient voltage suppression applications and is currently in active production status. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits selection from qualified alternatives that meet the same electrical and mechanical specifications.

Substiute Parts

V300LA40AP

Littelfuse Inc.In Stock: 1269V300LA40AP Datasheet

Current PartRFQ

V300LC40AP

Littelfuse Inc.In Stock: 2368V300LC40AP Datasheet

Parametric EquivalentRFQ

B72220S0301K101

EPCOS - TDK ElectronicsIn Stock: 1000416B72220S0301K101 Datasheet

MFR RecommendedRFQ

ERZ-V20D471

Panasonic Electronic ComponentsIn Stock: 15296ERZ-V20D471 Datasheet

MFR RecommendedRFQ

ERZ-V20R471

Panasonic Electronic ComponentsIn Stock: 1332ERZ-V20R471 Datasheet

MFR RecommendedRFQ

MOV20V300Y

Eaton - Electronics DivisionIn Stock: 1818MOV20V300Y Datasheet

MFR RecommendedRFQ

V300LA40A

Harris CorporationIn Stock: 4749V300LA40A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the V300LA40AP is determined by the following critical parameters:

• Maximum AC Volts: 300 V
• Maximum DC Volts: 385 V to 405 V (acceptable range)
• Varistor Voltage (Typ): 470 V
• Current - Surge: 6.5 kA to 10 kA (acceptable range for higher energy dissipation)
• Mounting Type: Through Hole
• Package / Case: Disc 20mm to 21.5mm (acceptable range)
• RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories:

Parametric Equivalents: Parts with identical electrical specifications and the same series designation (V300LA40A, V300LC40AP). These provide direct functional replacement.

Manufacturer Recommended Alternatives: Parts from other manufacturers (EPCOS - TDK Electronics, Panasonic Electronic Components, Eaton - Electronics Division) that meet or exceed the electrical performance requirements while maintaining through-hole disc form factor compatibility.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Preferred):

V300LC40AP and V300LA40A are parametric equivalents with identical electrical specifications. V300LC40AP is ROHS3 compliant and recommended for new designs. V300LA40A is RoHS non-compliant and suitable only for legacy applications where RoHS compliance is not required.

Qualified Alternatives (Higher Performance):

B72220S0301K101 (EPCOS - TDK Electronics) provides 8 kA surge current and extended operating temperature range (-40°C ~ 105°C). ERZ-V20D471 and ERZ-V20R471 (Panasonic Electronic Components) offer 10 kA surge current and 350 J energy rating, providing enhanced transient suppression capability. MOV20V300Y (Eaton - Electronics Division) matches the 6.5 kA surge specification with extended operating temperature range (-40°C ~ 125°C).

All substitute parts maintain ROHS3 compliance, active product status, and through-hole mounting compatibility. Selection should account for PCB layout constraints related to disc diameter (20mm vs. 21.5mm) and application-specific temperature requirements.

Frequently Asked Questions (FAQ)

Q: Can V300LC40AP be used as a direct replacement for V300LA40AP?

A: Yes. V300LC40AP is a parametric equivalent with identical electrical specifications (300 V AC, 405 V DC, 470 V varistor voltage, 6.5 kA surge current, 165 J energy) and the same through-hole disc 20mm package. Both are ROHS3 compliant and active products.

Q: What is the difference between the 6.5 kA and 10 kA surge current variants?

A: The 6.5 kA variants (V300LA40AP, V300LC40AP, MOV20V300Y) are rated for 165 J to 204 J energy dissipation. The 10 kA variants (ERZ-V20D471, ERZ-V20R471) are rated for 350 J energy dissipation, providing enhanced protection for applications with higher transient energy levels. Both meet the 300 V AC / 470 V varistor voltage specification.

Q: Are there package size differences between substitutes?

A: Yes. V300LA40AP, V300LC40AP, B72220S0301K101, and MOV20V300Y use disc 20mm packages. ERZ-V20D471 and ERZ-V20R471 use disc 21.5mm packages. PCB layout must accommodate the larger diameter if selecting Panasonic alternatives.

Q: Why is V300LA40A listed as a substitute if it is RoHS non-compliant?

A: V300LA40A is a parametric equivalent with identical electrical specifications and is included for reference in legacy applications where RoHS compliance is not mandated. For new designs and regulated applications, ROHS3-compliant alternatives (V300LC40AP, B72220S0301K101, ERZ-V20D471, ERZ-V20R471, MOV20V300Y) are required.

Q: What operating temperature range should be considered for substitute selection?

A: The V300LA40AP operates from -55°C to 85°C. Substitutes with extended ranges (-40°C ~ 105°C for B72220S0301K101, -40°C ~ 125°C for MOV20V300Y) are suitable for applications requiring higher temperature performance. Panasonic alternatives operate from -40°C to 85°C, matching the lower temperature limit of the main part.

Q: Can higher surge current variants be used in applications designed for 6.5 kA?

A: Yes. B72220S0301K101 (8 kA), ERZ-V20D471, and ERZ-V20R471 (10 kA) provide equal or superior surge current ratings and are electrically compatible. Higher surge ratings do not degrade performance in applications designed for lower ratings; they provide additional margin for transient protection.