VHO55-12IO7 Equivalent & Substitute Parts

Part Overview

The VHO55-12IO7 is a single-phase SCR bridge rectifier module rated for 1.2 kV operation, manufactured by IXYS in the FO-T-A chassis mount package. This module integrates 2 SCRs and 2 diodes in a bridge configuration, designed for high-current switching applications with a maximum on-state current of 53 A (average). The product is currently obsolete, making identification of compatible substitute components essential for system maintenance and redesign applications.

Substiute Parts

VHO55-12IO7

IXYSIn Stock: 731VHO55-12IO7 Datasheet

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MCD26-12IO1B

IXYSIn Stock: 1067MCD26-12IO1B Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the VHO55-12IO7 is determined by the following critical parameters:

• Voltage Rating: Off-state voltage must equal or exceed 1.2 kV
• Current Capacity: On-state current rating must support the application requirements
• Gate Trigger Characteristics: Vgt and Igt parameters must remain compatible with existing gate drive circuits
• Hold Current: Must not exceed 200 mA maximum
• Temperature Range: Operating range must encompass -40°C to 125°C
• Mounting Configuration: Chassis mount requirement must be maintained
• Regulatory Compliance: ROHS3 compliance and REACH unaffected status required

The MCD26-12IO1B meets the core voltage, gate trigger, hold current, temperature, mounting, and compliance requirements. However, its on-state current rating (32 A average, 50 A RMS) is lower than the VHO55-12IO7 (53 A average), reflecting a different internal structure (series connection versus bridge configuration).

Parameter Comparison

Engineering Selection Recommendations

The MCD26-12IO1B is an active product from IXYS with full ROHS3 compliance and REACH unaffected status, making it suitable for applications where the VHO55-12IO7 is no longer available. Both components share identical voltage ratings, gate trigger specifications, hold current limits, and operating temperature ranges.

Selection of the MCD26-12IO1B requires verification that the reduced on-state current capacity (32 A average versus 53 A average) is acceptable for the intended application. The different internal structure (series connection versus bridge configuration) and package format (TO-240AA versus FO-T-A) necessitate mechanical and thermal design review.

Frequently Asked Questions (FAQ)

Q: Can the MCD26-12IO1B directly replace the VHO55-12IO7 in all applications?

A: Direct replacement is not guaranteed. While both components share the same 1.2 kV voltage rating and gate trigger characteristics, the MCD26-12IO1B has a lower on-state current rating (32 A average versus 53 A average). Applications requiring the full 53 A capacity must be re-evaluated. Additionally, the different package format (TO-240AA versus FO-T-A) requires mechanical redesign.

Q: What are the key electrical parameters that must match for substitution?

A: The critical parameters are off-state voltage (1.2 kV), gate trigger voltage (1.5 V maximum), gate trigger current (100 mA maximum), hold current (200 mA maximum), and operating temperature range (-40°C to 125°C). Both components meet these specifications.

Q: Are there compliance or regulatory differences between these parts?

A: Both the VHO55-12IO7 and MCD26-12IO1B are ROHS3 compliant and REACH unaffected. No regulatory barriers exist to substitution from a compliance perspective.

Q: What is the significance of the different package formats?

A: The VHO55-12IO7 uses the FO-T-A package while the MCD26-12IO1B uses TO-240AA. These are different mechanical and thermal interfaces. Thermal performance, mounting hole patterns, and lead configurations differ, requiring PCB and mechanical redesign.

Q: How do the surge current ratings compare?

A: The VHO55-12IO7 is rated for 550A (50Hz) and 600A (60Hz) non-repetitive surge current. The MCD26-12IO1B is rated for 520A (50Hz) and 560A (60Hz). Both provide adequate surge protection for typical applications, with the VHO55-12IO7 offering slightly higher surge capacity.