V420LC20AP Equivalent & Substitute Parts

Part Overview

The V420LC20AP is a 680 V, 4.5 kA disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression applications. This through-hole component operates across a temperature range of -55°C to 85°C and is currently in active production status. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, inventory availability, or compliance considerations.

Key Parameters

Parameter	Value
Maximum AC Volts	420 V
Maximum DC Volts	560 V
Varistor Voltage (Typical)	680 V
Varistor Voltage Range	612 V – 748 V
Current - Surge	4.5 kA
Energy Absorption	90 J
Number of Circuits	1
Capacitance @ 1 MHz	300 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 14mm

Substitute Part Grouping Explanation

Substitute parts for the V420LC20AP are identified based on electrical parameter equivalence and mechanical compatibility. The following criteria determine substitutability:

Critical Parameters for Substitution:

Maximum AC Volts: 420 V
Maximum DC Volts: 560 V
Varistor Voltage (Typical): 680 V
Current - Surge: 4.5 kA
Energy Absorption: 90 J
Mounting Type: Through Hole
Package / Case: Disc 14mm

Parts meeting these electrical and mechanical specifications are classified as parametric equivalents and may be used interchangeably in circuit applications requiring these performance characteristics.

Parameter Comparison

Parameter	V420LC20AP (Littelfuse)	V420LA20AP (Littelfuse)	V420LC20A (Harris)
Maximum AC Volts	420 V	420 V	420 V
Maximum DC Volts	560 V	560 V	560 V
Varistor Voltage (Min)	612 V	612 V	612 V
Varistor Voltage (Typ)	680 V	680 V	680 V
Varistor Voltage (Max)	748 V	748 V	748 V
Current - Surge	4.5 kA	4.5 kA	4.5 kA
Energy	90 J	90 J	90 J
Number of Circuits	1	1	1
Capacitance @ 1 MHz	300 pF	300 pF	300 pF
Operating Temperature Range	-55°C to 85°C	-55°C to 85°C	-55°C to 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Disc 14mm	Disc 14mm	Disc 14mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Non-Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected	Vendor Undefined
Product Status	Active	Active	Active

Engineering Selection Recommendations

V420LA20AP (Littelfuse Inc.): This part is a parametric equivalent with identical electrical specifications and mounting characteristics. Both the main part and this substitute maintain ROHS3 compliance, MSL Level 1 rating, and REACH Unaffected status. Series designation differs (LA vs. LC), but functional performance is equivalent.

V420LC20A (Harris Corporation): This part meets all critical electrical and mechanical parameters. However, it differs in compliance profile: RoHS non-compliant status and MSL Level 3 (168 Hours) moisture sensitivity require evaluation against application requirements. REACH status is vendor-undefined. Selection of this substitute should be based on specific regulatory and environmental constraints of the end application.

Frequently Asked Questions (FAQ)

Q: Can V420LA20AP be used as a direct replacement for V420LC20AP? A: Yes. Both parts share identical electrical parameters (420 V AC, 560 V DC, 680 V typical varistor voltage, 4.5 kA surge current, 90 J energy), mounting type (through hole), and package (disc 14mm). Compliance certifications are equivalent (ROHS3, MSL 1, REACH Unaffected).

Q: What are the key differences between V420LC20A and the main part? A: Electrical and mechanical specifications are identical. Differences exist in compliance: V420LC20A is RoHS non-compliant and carries MSL Level 3 (168 Hours) moisture sensitivity versus MSL Level 1 (Unlimited) for the main part. REACH status is vendor-undefined for V420LC20A.

Q: Are all three parts mechanically interchangeable? A: Yes. All three parts use through-hole mounting with disc 14mm packaging, enabling direct PCB footprint compatibility.

Q: Which substitute should be selected for RoHS-compliant applications? A: Both V420LC20AP and V420LA20AP maintain ROHS3 compliance. V420LC20A does not meet RoHS requirements and should not be used in applications with RoHS mandates.

Q: What is the significance of MSL Level differences? A: MSL Level 1 (Unlimited) indicates no moisture sensitivity restrictions during storage and handling. MSL Level 3 (168 Hours) requires controlled humidity storage and limits shelf life. Selection depends on supply chain and storage conditions.

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