CR70U-080 Equivalent & Substitute Parts Reference

Part Overview

The CR70U-080 is a general-purpose rectifier diode manufactured by Central Semiconductor Corp, rated for 800 V DC reverse voltage and 70 A average rectified current in a DO-203AB (DO-5) stud mount package. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing system support and procurement planning. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating available packaging and mounting configurations.

Substiute Parts

CR70U-080

Central Semiconductor CorpIn Stock: 1087CR70U-080 Datasheet

Current PartRFQ

S70K

GeneSiC SemiconductorIn Stock: 1030S70K Datasheet

MFR RecommendedRFQ

VS-80PF80W

Vishay General Semiconductor - Diodes DivisionIn Stock: 861VS-80PF80W Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CR70U-080 are selected based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Critical Parameters for Substitution:

• Voltage - DC Reverse (Vr) (Max): Must equal 800 V
• Current - Average Rectified (Io): Must equal or exceed 70 A
• Mounting Type: Must support Stud Mount configuration
• Package / Case: Must be compatible with DO-203AB, DO-5, or Stud mount form factors

Secondary Compatibility Factors:

• Operating Temperature Range: Must encompass or exceed the original -65°C to 175°C range
• Technology Classification: Standard rectifier diode technology
• Reverse Recovery Characteristics: Speed classification (Fast Recovery vs. Standard Recovery)

Two substitute parts meet these criteria: the S70K from GeneSiC Semiconductor and the VS-80PF80W from Vishay General Semiconductor - Diodes Division. Both maintain the 800 V reverse voltage rating and stud mount configuration. The S70K matches the 70 A current rating exactly, while the VS-80PF80W provides 80 A capability, offering additional current margin.

Parameter Comparison

Engineering Selection Recommendations

S70K (GeneSiC Semiconductor): The S70K provides an exact current rating match at 70 A with identical 800 V reverse voltage specification. This part is currently active in production and carries RoHS Compliant certification. The S70K exhibits lower forward voltage (1.1 V @ 70 A compared to 1.35 V), resulting in reduced power dissipation. However, the S70K is classified as Standard Recovery (>500 ns), whereas the original CR70U-080 is Fast Recovery (≤500 ns, 100 ns trr). This recovery speed difference must be evaluated against application switching frequency requirements. The operating temperature range extends to 180 °C, providing 5 °C additional margin above the original specification.

VS-80PF80W (Vishay General Semiconductor - Diodes Division): The VS-80PF80W provides 80 A average rectified current, exceeding the original 70 A requirement by 14 percent. This part maintains the 800 V reverse voltage rating and stud mount configuration. The VS-80PF80W is active in production with ROHS3 Compliant certification and REACH Unaffected status. The forward voltage specification (1.4 V @ 220 A) is provided at a different current level than the original part, limiting direct thermal comparison. Like the S70K, this part is classified as Standard Recovery (>500 ns). The operating temperature range is -55 °C to 180 °C, providing 5 °C upper margin but reducing lower temperature capability by 10 °C relative to the original specification.

Selection Basis: Both substitute parts satisfy the mandatory electrical parameters (800 V, ≥70 A, stud mount, DO-203AB package). Selection between S70K and VS-80PF80W depends on application-specific requirements: the S70K maintains exact current rating and lower forward voltage, while the VS-80PF80W provides current margin and represents a higher-current platform. Both parts are active products with current compliance certifications, addressing the obsolescence status of the CR70U-080.

Frequently Asked Questions (FAQ)

Q: Can the S70K directly replace the CR70U-080 in all applications?

A: The S70K matches the CR70U-080 in voltage (800 V), current (70 A), and stud mount packaging. However, the S70K is classified as Standard Recovery (>500 ns) while the CR70U-080 is Fast Recovery (≤500 ns, 100 ns trr). Applications operating at high switching frequencies may experience increased switching losses or EMI with the S70K. Thermal and EMI performance must be evaluated for the specific application.

Q: Why does the VS-80PF80W have a higher current rating (80 A vs. 70 A)?

A: The VS-80PF80W is a higher-current variant within the 800 V stud mount diode family. The 80 A rating provides design margin and allows use in applications requiring higher current capacity. The part remains compatible with CR70U-080 applications operating at or below 70 A, as the 80 A rating is a maximum specification.

Q: Are there temperature range differences between the substitute parts and the original CR70U-080?

A: Yes. The CR70U-080 operates from -65 °C to 175 °C. The S70K extends the upper limit to 180 °C (+5 °C margin). The VS-80PF80W operates from -55 °C to 180 °C, providing +5 °C upper margin but reducing lower temperature capability by 10 °C. Applications requiring operation below -55 °C must use the S70K or verify CR70U-080 availability.

Q: What is the significance of the forward voltage differences shown in the parameter table?

A: Forward voltage directly affects power dissipation and thermal performance. The S70K exhibits 1.1 V @ 70 A (lower than the original 1.35 V), reducing dissipation. The VS-80PF80W specification (1.4 V @ 220 A) is provided at a different current level and cannot be directly compared to the original part's 1.35 V @ 70 A specification. Thermal design calculations must use the forward voltage at the actual operating current.

Q: Do the substitute parts require different mounting hardware or thermal management?

A: Both substitute parts maintain the DO-203AB (DO-5) stud mount package, compatible with standard stud mount hardware. However, the S70K's lower forward voltage may reduce thermal dissipation, potentially allowing smaller heat sinks. The VS-80PF80W's higher current capability may require thermal management evaluation if used in applications previously operating at the 70 A limit. Mounting hardware compatibility is maintained across all three parts.

Q: What compliance certifications should be considered for new designs?

A: The CR70U-080 (obsolete) has no specified RoHS status. The S70K carries RoHS Compliant certification, and the VS-80PF80W carries ROHS3 Compliant certification. For new designs or systems requiring RoHS compliance, either substitute part is acceptable. The VS-80PF80W additionally carries REACH Unaffected status, providing additional regulatory clarity for European applications.

Q: Can both substitute parts be used interchangeably in the same design?

A: Both parts meet the core electrical requirements (800 V, ≥70 A, stud mount) and can function in CR70U-080 applications. However, they differ in recovery speed classification and forward voltage characteristics. Designs should standardize on a single substitute part to maintain consistent thermal and switching performance across production units. Mixing S70K and VS-80PF80W in the same system is not recommended without thermal and EMI re-evaluation.