ROV07-751K Equivalent & Substitute Parts

Part Overview

The ROV07-751K is a 750V 1.2kA disc varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole applications. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The part operates across a temperature range of -40°C to 125°C and is housed in a 7mm disc package format.

Key Parameters

Parameter	Value
Varistor Voltage (Typical)	750 V
Current - Surge	1.2 kA
Maximum AC Volts	460 V
Maximum DC Volts	615 V
Energy	45 J
Number of Circuits	1
Mounting Type	Through Hole
Package / Case	Disc 7mm
Operating Temperature	-40°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the ROV07-751K are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Varistor Voltage (Typical): 750 V
Current - Surge: 1.2 kA
Maximum AC Volts: 460 V
Maximum DC Volts: 615 V
Number of Circuits: 1
Mounting Type: Through Hole
RoHS Status: ROHS3 Compliant

Allowable Variations:

Package / Case: Disc format (7mm or 9mm acceptable)
Energy: Within component design tolerance
Capacitance @ Frequency: Minor variations acceptable
Operating Temperature: Minimum -40°C required; upper limit may vary

Two substitute parts meet these criteria and are listed below.

Parameter Comparison

Parameter	ROV07-751K (Main)	B72207S0461K101	VDRS07H460BSE
Manufacturer	Littelfuse Inc.	EPCOS - TDK Electronics	Vishay Beyschlag/Draloric/BC Components
Product Status	Obsolete	Active	Active
Varistor Voltage (Min)	675 V	675 V	675 V
Varistor Voltage (Typ)	750 V	750 V	750 V
Varistor Voltage (Max)	825 V	825 V	825 V
Current - Surge	1.2 kA	1.2 kA	1.2 kA
Maximum AC Volts	460 V	460 V	460 V
Maximum DC Volts	615 V	615 V	615 V
Number of Circuits	1	1	1
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Disc 7mm	Disc 7mm	Disc 9mm
Capacitance @ Frequency	74 pF @ 1 kHz	70 pF @ 1 kHz	75 pF @ 1 kHz
Energy	45 J	36 J	63 J
Operating Temperature	-40°C ~ 125°C	-40°C ~ 105°C	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

B72207S0461K101 (EPCOS - TDK Electronics)

This substitute maintains identical electrical specifications and package format (Disc 7mm) to the ROV07-751K. The part is currently in active production status with 5508 units in stock. All critical parameters match: 750V typical varistor voltage, 1.2kA surge current, 460V maximum AC, and 615V maximum DC ratings. The operating temperature range extends to 105°C, which is lower than the original part's 125°C maximum but remains within acceptable limits for most applications. Energy rating of 36J is lower than the original 45J specification. RoHS3 compliance and REACH unaffected status are maintained.

VDRS07H460BSE (Vishay Beyschlag/Draloric/BC Components)

This substitute matches all critical electrical parameters but uses a larger Disc 9mm package format compared to the original 7mm. The part is in active production with 2320 units available. Electrical specifications are identical: 750V typical varistor voltage, 1.2kA surge current, 460V maximum AC, and 615V maximum DC. The energy rating of 63J exceeds the original specification. Operating temperature range is limited to 85°C maximum, which is lower than both the original part and the EPCOS alternative. RoHS3 compliance and REACH unaffected status are maintained. Package size difference requires PCB layout verification.

Frequently Asked Questions (FAQ)

Q: Can B72207S0461K101 be used as a direct replacement for ROV07-751K?

A: Yes. Both parts share identical electrical ratings (750V typical, 1.2kA surge current, 460V AC maximum, 615V DC maximum) and the same Disc 7mm package format. The lower operating temperature maximum (105°C vs. 125°C) and reduced energy rating (36J vs. 45J) must be evaluated against application requirements.

Q: What is the primary difference between the two substitute parts?

A: B72207S0461K101 maintains the original 7mm disc package, while VDRS07H460BSE uses a larger 9mm disc package. The Vishay part offers higher energy handling (63J) but operates at a lower maximum temperature (85°C). Both meet the core electrical specifications.

Q: Is the package size difference between 7mm and 9mm critical?

A: Package size affects PCB footprint and board layout. The 9mm variant (VDRS07H460BSE) requires verification that the larger disc diameter fits within available board space. Electrical performance is not affected by package size difference.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both B72207S0461K101 and VDRS07H460BSE are RoHS3 compliant and REACH unaffected, matching the compliance status of the original ROV07-751K.

Q: Which substitute part has better availability?

A: B72207S0461K101 has higher inventory (5508 units) compared to VDRS07H460BSE (2320 units).

Q: Can I use these substitutes in high-temperature applications above 105°C?

A: B72207S0461K101 is rated to 105°C maximum. VDRS07H460BSE is rated to 85°C maximum. Applications requiring operation above these limits require alternative component selection.

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