VHF28-08IO5 Equivalent & Substitute Parts

Part Overview

The VHF28-08IO5 is an SCR Module thyristor bridge rated for 800 V single-phase operation with 28 A on-state current capability. This component features a chassis mount FO-F-A package configuration with integrated SCRs and diodes for rectification applications. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Substiute Parts

VHF28-08IO5

IXYSIn Stock: 90450VHF28-08IO5 Datasheet

Current PartRFQ

VHFD37-08IO1

IXYSIn Stock: 7621VHFD37-08IO1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the VHF28-08IO5 is determined by the following critical parameters:

• Voltage Rating: Off-state voltage must equal or exceed 800 V
• Current Capacity: On-state current (It (AV)) must meet or exceed 28 A
• Gate Trigger Characteristics: Vgt and Igt must remain within specified limits (1 V max, 65 mA max)
• Surge Current Rating: Non-repetitive surge current must support application requirements
• Bridge Configuration: Single-phase SCR/diode bridge topology with matching layout
• Thermal Range: Operating temperature range must encompass -40°C to 125°C
• Mounting Interface: Chassis mount configuration required for mechanical compatibility

The VHFD37-08IO1 qualifies as a manufacturer-recommended substitute based on these parameters. While the package changes from FO-F-A to V1A-PAK, the electrical specifications and functional bridge topology remain compatible for equivalent circuit operation.

Parameter Comparison

Engineering Selection Recommendations

The VHFD37-08IO1 is the manufacturer-recommended substitute for the obsolete VHF28-08IO5. Selection is supported by the following factors:

• Electrical Equivalence: All critical electrical parameters match or exceed the original specification. The 36 A on-state current and enhanced surge ratings (320A/350A) provide operational margin beyond the 28 A requirement.
• Product Status: The VHFD37-08IO1 maintains active product status with current manufacturing support, ensuring long-term availability and supply chain continuity.
• Compliance Alignment: Both parts maintain ROHS3 compliance and identical thermal operating ranges, supporting regulatory and environmental requirements.
• Functional Compatibility: The single-phase bridge topology and SCR/diode configuration remain functionally identical, preserving circuit operation within existing designs.
• Package Transition: The change from FO-F-A to V1A-PAK packaging requires mechanical re-evaluation for mounting interfaces and thermal management, but does not affect electrical performance.

Frequently Asked Questions (FAQ)

Q: Can the VHFD37-08IO1 directly replace the VHF28-08IO5 in existing designs?

A: Electrical substitution is valid based on matching voltage ratings, gate trigger characteristics, and bridge topology. Mechanical compatibility must be verified due to package change from FO-F-A to V1A-PAK. Mounting interface and thermal dissipation path validation is required before implementation.

Q: Why does the VHFD37-08IO1 have higher current ratings than the VHF28-08IO5?

A: The VHFD37-08IO1 provides 36 A on-state current versus 28 A, and enhanced surge ratings (320A/350A versus 300A/330A). These specifications represent design improvements in the active product line and do not prevent substitution. The higher ratings ensure compatibility with the original 28 A requirement.

Q: Are there differences in the diode configuration between these parts?

A: The VHF28-08IO5 contains 2 SCRs and 2 diodes, while the VHFD37-08IO1 contains 2 SCRs and 4 diodes. Both maintain the single-phase bridge topology with Layout 1 configuration. The additional diodes in the substitute part support enhanced circuit performance without affecting functional equivalence.

Q: What compliance certifications apply to both parts?

A: Both the VHF28-08IO5 and VHFD37-08IO1 are ROHS3 compliant and REACH unaffected. Both carry EAR99 export classification and identical HTSUS commodity codes (8541.30.0080), supporting regulatory and trade compliance requirements.

Q: Is thermal management affected by the package change?

A: The transition from FO-F-A to V1A-PAK packaging may affect thermal dissipation characteristics and mounting interface design. Thermal analysis specific to the application and new package configuration is necessary to ensure adequate heat transfer and component reliability.