ROV14-471K Equivalent & Substitute Parts

Part Overview

The ROV14-471K is a 470V 4.5kA disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression applications. This component features a 14mm disc form factor and is rated for through-hole mounting. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement continuity. Substitute parts must maintain electrical performance within the specified voltage and surge current parameters while accommodating available packaging and inventory options.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	470 V
Varistor Voltage Range	423 V – 517 V
Maximum AC Voltage	300 V
Maximum DC Voltage	385 V
Surge Current Rating	4.5 kA
Energy Absorption	140 J
Number of Circuits	1
Mounting Type	Through Hole
Package Form	Disc 14mm
Operating Temperature Range	-40°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ROV14-471K is determined by the following critical parameters:

Varistor voltage range (423 V – 517 V nominal 470 V)
Maximum AC and DC voltage ratings (300 V AC / 385 V DC minimum)
Surge current capability (4.5 kA minimum)
Through-hole mounting configuration
Single-circuit topology
RoHS3 compliance

The identified substitutes meet these core electrical and mechanical requirements. Variations in energy absorption, capacitance, operating temperature range, and package dimensions are secondary considerations that do not prevent functional equivalence within the specified parameter envelope.

Parameter Comparison

Parameter	ROV14-471K (Littelfuse)	B72214S0301K551 (EPCOS/TDK)	ERZ-V14D471 (Panasonic)
Manufacturer	Littelfuse Inc.	EPCOS – TDK Electronics	Panasonic Electronic Components
Product Status	Obsolete	Active	Active
Varistor Voltage (Typ)	470 V	470 V	470 V
Varistor Voltage Range	423 – 517 V	423 – 517 V	423 – 517 V
Maximum AC Voltage	300 V	300 V	300 V
Maximum DC Voltage	385 V	385 V	385 V
Surge Current Rating	4.5 kA	4.5 kA	6 kA
Energy Absorption	140 J	76 J	175 J
Number of Circuits	1	1	1
Capacitance @ 1 kHz	413 pF	400 pF	400 pF
Operating Temperature Range	-40°C to 125°C	-40°C to 105°C	-40°C to 85°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package Form	Disc 14mm	Disc 14mm	Disc 15.5mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Both B72214S0301K551 and ERZ-V14D471 are active production alternatives to the obsolete ROV14-471K. Selection between these substitutes depends on application-specific requirements:

B72214S0301K551 (EPCOS/TDK) maintains the closest electrical profile to the original part, with matching 4.5 kA surge current and 14mm disc package geometry. This substitute is supplied in cut tape packaging and supports operating temperatures to 105°C. The lower energy absorption rating (76 J) requires verification against transient energy profiles in the target application.

ERZ-V14D471 (Panasonic) provides enhanced surge current capability (6 kA) and higher energy absorption (175 J), offering increased margin for high-energy transient events. The package form is 15.5mm disc, requiring PCB layout verification for mechanical fit. Operating temperature range is limited to -40°C to 85°C. This part is supplied in bulk packaging.

Both substitutes maintain full compliance with RoHS3 and REACH requirements. Selection should be based on PCB space constraints, thermal environment, transient energy requirements, and packaging format availability.

Frequently Asked Questions (FAQ)

Q: Can B72214S0301K551 be used as a direct replacement for ROV14-471K?

A: Yes. Both parts share identical varistor voltage (470 V nominal), maximum AC/DC ratings (300 V AC / 385 V DC), surge current (4.5 kA), and package form (14mm disc). The primary difference is energy absorption capacity (76 J vs. 140 J) and maximum operating temperature (105°C vs. 125°C). Verify that the application transient energy does not exceed 76 J.

Q: What are the mechanical differences between the substitutes?

A: ROV14-471K and B72214S0301K551 both use 14mm disc packages and are mechanically interchangeable on standard through-hole PCB layouts. ERZ-V14D471 uses a 15.5mm disc package, requiring PCB footprint verification before substitution.

Q: Does ERZ-V14D471 provide better performance than the original part?

A: ERZ-V14D471 offers higher surge current (6 kA vs. 4.5 kA) and greater energy absorption (175 J vs. 140 J), providing increased transient suppression margin. However, the operating temperature range is narrower (-40°C to 85°C vs. -40°C to 125°C), which may be a constraint in high-temperature applications.

Q: Are all three parts RoHS3 compliant?

A: Yes. ROV14-471K, B72214S0301K551, and ERZ-V14D471 are all ROHS3 compliant and REACH unaffected.

Q: What packaging formats are available for these substitutes?

A: B72214S0301K551 is supplied in cut tape (CT) packaging. ERZ-V14D471 is supplied in bulk packaging. ROV14-471K packaging format is not specified in available data.

Q: Can capacitance differences affect circuit performance?

A: Capacitance values are similar across all three parts (400–413 pF @ 1 kHz), representing a 3% maximum variance. This difference is negligible for most transient voltage suppression applications and does not affect substitution eligibility.

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