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ROV07H751K Equivalent & Substitute Parts
Part Overview
The ROV07H751K is a 750V 1.75kA varistor manufactured by Littelfuse Inc., designed for transient voltage suppression applications. This component features a through-hole disc 7mm package and is rated for 58J energy dissipation. The part is currently obsolete, making identification of suitable substitute components essential for ongoing system maintenance and new design implementations where legacy compatibility is required.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Varistor Voltage (Typical) | 750 V |
| Current - Surge | 1.75 kA |
| Energy Dissipation | 58 J |
| Maximum AC Volts | 460 V |
| Maximum DC Volts | 615 V |
| Operating Temperature Range | -40°C to 125°C |
| Mounting Type | Through Hole |
| Package / Case | Disc 7mm |
| Number of Circuits | 1 |
| Capacitance @ 1 kHz | 75 pF |
Substitute Part Grouping Explanation
Substitution of the ROV07H751K is determined by the following critical parameters:
- Varistor Voltage Rating: Nominal 750V with acceptable range of 675V to 825V
- Mounting Configuration: Through-hole disc 7mm package
- Circuit Count: Single circuit design
- Maximum Voltage Ratings: 460V AC / 615V DC maximum operating conditions
- Temperature Operating Range: Minimum -40°C to 125°C capability
The B72207S0461K101 from EPCOS - TDK Electronics meets these core substitution criteria. While surge current capacity differs (1.2kA versus 1.75kA), the varistor voltage classification, package form factor, and electrical operating envelope remain compatible for applications within the specified voltage and temperature parameters.
Parameter Comparison
| Parameter | ROV07H751K (Littelfuse) | B72207S0461K101 (EPCOS - TDK) | Compatibility |
|---|---|---|---|
| Varistor Voltage (Typ) | 750 V | 750 V | Matched |
| Varistor Voltage (Min) | 675 V | 675 V | Matched |
| Varistor Voltage (Max) | 825 V | 825 V | Matched |
| Current - Surge | 1.75 kA | 1.2 kA | Substitute rated lower |
| Energy Dissipation | 58 J | 36 J | Substitute rated lower |
| Maximum AC Volts | 460 V | 460 V | Matched |
| Maximum DC Volts | 615 V | 615 V | Matched |
| Operating Temperature (Min) | -40°C | -40°C | Matched |
| Operating Temperature (Max) | 125°C | 105°C | Substitute rated lower |
| Mounting Type | Through Hole | Through Hole | Matched |
| Package / Case | Disc 7mm | Disc 7mm | Matched |
| Number of Circuits | 1 | 1 | Matched |
| Capacitance @ 1 kHz | 75 pF | 70 pF | Comparable |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | Matched |
| REACH Status | REACH Unaffected | REACH Unaffected | Matched |
Engineering Selection Recommendations
The B72207S0461K101 is an active product from EPCOS - TDK Electronics and represents a direct substitute for the obsolete ROV07H751K. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new designs and legacy system replacements.
Selection of the B72207S0461K101 is appropriate for applications where the surge current requirement does not exceed 1.2kA and the maximum operating temperature does not exceed 105°C. The varistor voltage classification, package geometry, and maximum voltage ratings are fully compatible with the original specification.
Frequently Asked Questions (FAQ)
Q: Can the B72207S0461K101 directly replace the ROV07H751K in existing designs?
A: Yes, for applications operating within 1.2kA surge current and 105°C maximum temperature limits. The varistor voltage rating, package form factor, and electrical operating envelope are compatible.
Q: What is the significance of the lower surge current rating (1.2kA vs 1.75kA)?
A: The substitute part has a reduced surge current capacity. Applications requiring the full 1.75kA surge handling capability must evaluate whether the 1.2kA rating is sufficient for the specific transient voltage suppression duty cycle.
Q: Are there temperature operating range differences?
A: Yes. The ROV07H751K operates to 125°C maximum, while the B72207S0461K101 is rated to 105°C maximum. Applications requiring operation above 105°C require evaluation of thermal conditions and potential derating.
Q: Do both parts use identical packaging?
A: Yes. Both components use through-hole disc 7mm packages with identical mechanical and electrical footprints, enabling direct PCB mounting compatibility.
Q: Are compliance certifications equivalent?
A: Yes. Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component use.
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