ROV07-180M-S-2 Equivalent & Substitute Parts

Part Overview

The ROV07-180M-S-2 is an 18 V, 250 A Transient Voltage Suppressor (TVS) varistor in a 7mm disc form factor, designed for through-hole mounting applications. Manufactured by Littelfuse Inc., this component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. Substitute parts must maintain electrical performance within the specified voltage and current parameters while meeting modern compliance standards.

Key Parameters

Parameter	Value	Unit
Varistor Voltage (Typical)	18	V
Current - Surge	250	A
Maximum DC Volts	14	V
Maximum AC Volts	11	V
Package / Case	Disc 7mm	—
Mounting Type	Through Hole	—
Operating Temperature Range	-40°C ~ 125°C	°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Varistor Voltage (Typical): Must be 18 V to maintain circuit protection threshold
Maximum DC Volts: Must not exceed 14 V to ensure compatibility with circuit bias conditions
Maximum AC Volts: Must not exceed 11 V for AC circuit applications
Mounting Type: Must be through-hole to fit existing PCB layouts
Package / Case: Disc form factor required; minor dimensional variations (7mm vs. 8.5mm) acceptable if mechanical clearance permits
RoHS Compliance: ROHS3 compliance required for regulatory alignment

Parts meeting these criteria are classified as direct substitutes. Parts with higher surge current ratings (500 A vs. 250 A) provide enhanced transient protection without compromising circuit compatibility.

Parameter Comparison

Parameter	ROV07-180M-S-2	V18ZS1P	ERZ-V07D180
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Panasonic Electronic Components
Product Status	Obsolete	Active	Active
Varistor Voltage (Typ)	18 V	18 V	18 V
Varistor Voltage (Min)	14.4 V	16.2 V	16 V
Varistor Voltage (Max)	21.6 V	19.8 V	20 V
Current - Surge	250 A	250 A	500 A
Maximum DC Volts	14 V	14 V	14 V
Maximum AC Volts	11 V	10 V	11 V
Energy	1.2 J	0.8 J	1.1 J
Package / Case	Disc 7mm	Disc 7mm	Disc 8.5mm
Mounting Type	Through Hole	Through Hole	Through Hole
Operating Temperature Range	-40°C ~ 125°C	-55°C ~ 85°C	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

V18ZS1P (Littelfuse Inc., Active)

This part is a direct functional equivalent with identical surge current rating (250 A) and package dimensions (7mm disc). The varistor voltage tolerance is tighter (16.2–19.8 V vs. 14.4–21.6 V), providing improved voltage regulation consistency. Operating temperature range is reduced to -55°C ~ 85°C, which may limit use in high-temperature applications. This part is recommended for applications where the original operating temperature range (-40°C ~ 125°C) is not required. ROHS3 compliance and active product status ensure long-term availability.

ERZ-V07D180 (Panasonic Electronic Components, Active)

This part provides enhanced surge current capability (500 A vs. 250 A) while maintaining the same varistor voltage (18 V typical) and maximum DC/AC voltage ratings. The package is slightly larger (8.5mm disc vs. 7mm disc), requiring verification of mechanical clearance in existing designs. Operating temperature range is -40°C ~ 85°C. The higher surge current rating provides superior transient protection without introducing electrical incompatibility. This part is recommended for applications requiring enhanced transient suppression or where mechanical space permits the larger package. ROHS3 compliance and active product status ensure long-term availability.

Frequently Asked Questions (FAQ)

Q: Can V18ZS1P be used as a direct replacement for ROV07-180M-S-2?

A: Yes. Both parts share identical varistor voltage (18 V typical), maximum DC voltage (14 V), surge current (250 A), and package dimensions (7mm disc). The primary difference is operating temperature range; V18ZS1P is rated -55°C ~ 85°C versus -40°C ~ 125°C for the original part. Verify that your application does not require operation above 85°C.

Q: What is the advantage of ERZ-V07D180 over the original ROV07-180M-S-2?

A: ERZ-V07D180 provides double the surge current rating (500 A vs. 250 A) while maintaining identical varistor voltage and maximum voltage ratings. This delivers enhanced transient protection. The package is slightly larger (8.5mm vs. 7mm disc), requiring mechanical clearance verification.

Q: Are there any compliance or availability concerns with these substitutes?

A: Both substitute parts are ROHS3 compliant and carry active product status, ensuring regulatory alignment and long-term supply availability. The original ROV07-180M-S-2 is obsolete and should be phased out in favor of active alternatives.

Q: Does the difference in energy rating (1.2 J vs. 0.8 J or 1.1 J) affect substitution suitability?

A: Energy rating reflects transient energy dissipation capacity. V18ZS1P has lower energy rating (0.8 J) than the original (1.2 J), which may limit performance in high-energy transient environments. ERZ-V07D180 (1.1 J) is closer to the original specification. Verify energy requirements for your specific application.

Q: Can ERZ-V07D180 be used in existing PCB layouts designed for ROV07-180M-S-2?

A: Electrical compatibility is confirmed. However, the package is larger (8.5mm vs. 7mm disc), requiring mechanical clearance verification. Consult PCB layout documentation to confirm adequate space around the component footprint.

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