MOV-20D820K Equivalent & Substitute Parts

Part Overview

The MOV-20D820K is a 82 V, 6.5 kA transient voltage suppressor varistor manufactured by Bourns Inc. in a 20mm disc through-hole package. This component is designed for transient overvoltage protection in electronic circuits 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.

Key Parameters

Parameter	Value
Manufacturer Part Number	MOV-20D820K
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Varistor Voltage (Typ)	82 V
Current - Surge	6.5 kA
Maximum DC Volts	65 V
Maximum AC Volts	50 V
Energy	38 J
Package / Case	Disc 20mm
Mounting Type	Through Hole
Operating Temperature	-40°C ~ 105°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the MOV-20D820K are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Varistor voltage nominal rating: 82 V (minimum 73.8 V, maximum 90.2 V tolerance band)
Maximum DC voltage rating: 65 V
Maximum AC voltage rating: 50 V
Package form factor: Disc configuration, through-hole mounting
Number of circuits: 1
RoHS3 compliance and REACH unaffected status

Allowable Variations:

Surge current capacity: 6.5 kA or higher
Energy dissipation: 38 J or higher
Operating temperature range: -40°C minimum and 85°C or higher maximum
Physical package dimensions: Disc 20mm to 21.5mm
Capacitance at 1 kHz: Variation permitted within manufacturer specifications

Parts meeting these criteria are electrically and mechanically compatible for direct substitution in circuit applications designed for the MOV-20D820K.

Parameter Comparison

Parameter	MOV-20D820K (Bourns)	B72220S0500K101 (EPCOS - TDK)	ERZ-V20D820 (Panasonic)
Varistor Voltage (Min)	74 V	73.8 V	74 V
Varistor Voltage (Typ)	82 V	82 V	82 V
Varistor Voltage (Max)	90 V	90.2 V	90 V
Maximum DC Volts	65 V	65 V	65 V
Maximum AC Volts	50 V	50 V	50 V
Current - Surge	6.5 kA	6.5 kA	10 kA
Energy	38 J	27 J	56 J
Number of Circuits	1	1	1
Operating Temperature	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Disc 20mm	Disc 20mm	Disc 21.5mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three parts listed—MOV-20D820K, B72220S0500K101, and ERZ-V20D820—are active production components with ROHS3 compliance and REACH unaffected status, qualifying them for use in regulated applications.

MOV-20D820K (Bourns Inc.): Primary specification reference. Supports operating temperatures to 105°C with 38 J energy rating and 6.5 kA surge capacity.

B72220S0500K101 (EPCOS - TDK Electronics): Direct electrical equivalent with identical varistor voltage range and surge current rating. Operating temperature range matches the primary part to 105°C. Energy dissipation is 27 J, which is lower than the primary specification. Physical package is identical at 20mm disc. Suitable for applications where energy dissipation margin is not a limiting factor.

ERZ-V20D820 (Panasonic Electronic Components): Meets varistor voltage and DC/AC voltage specifications. Provides higher surge current capacity at 10 kA and higher energy dissipation at 56 J. Operating temperature maximum is 85°C, which is lower than the primary part. Physical package is 21.5mm disc, requiring verification of mechanical fit in the circuit board layout. Suitable for applications requiring enhanced surge protection margin.

Frequently Asked Questions (FAQ)

Q: Can B72220S0500K101 be used as a direct replacement for MOV-20D820K?

A: Yes. Both parts share identical varistor voltage specifications (82 V nominal), maximum DC voltage (65 V), maximum AC voltage (50 V), surge current rating (6.5 kA), and operating temperature range (-40°C to 105°C). The 20mm disc package is identical. The primary difference is energy dissipation: B72220S0500K101 is rated at 27 J versus 38 J for MOV-20D820K. Selection depends on whether the circuit design requires the full 38 J energy margin.

Q: Can ERZ-V20D820 be used as a direct replacement for MOV-20D820K?

A: Electrical substitution is possible with mechanical verification. Both parts meet the 82 V varistor voltage and 65 V DC / 50 V AC voltage requirements. ERZ-V20D820 provides superior surge protection at 10 kA and higher energy dissipation at 56 J. However, the package is 21.5mm disc versus 20mm disc for MOV-20D820K. Circuit board layout and mounting hole spacing must be verified for compatibility. Additionally, the maximum operating temperature is 85°C, which is 20°C lower than MOV-20D820K.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: (1) varistor voltage nominal rating within the 82 V specification band; (2) maximum DC voltage rating of 65 V or higher; (3) maximum AC voltage rating of 50 V or higher; (4) through-hole mounting type; (5) single-circuit configuration; (6) disc package form factor; (7) RoHS3 compliance; and (8) operating temperature range supporting the application requirements.

Q: Are there differences in capacitance between these parts?

A: Yes. Capacitance at 1 kHz varies: MOV-20D820K is 6000 pF, B72220S0500K101 is 3800 pF, and ERZ-V20D820 is 7500 pF. These differences reflect manufacturer design variations and do not affect substitution eligibility for transient voltage suppression applications unless the circuit design specifically depends on varistor capacitance characteristics.

Q: What inventory status should be considered for part selection?

A: Current inventory levels are: MOV-20D820K (1181 pcs), B72220S0500K101 (3635 pcs), and ERZ-V20D820 (1519 pcs). All parts are available as new original stock. Selection may be influenced by supply chain requirements and lead time considerations.

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