VHFD29-08IO1 Equivalent & Substitute Parts

Part Overview

The VHFD29-08IO1 is an SCR Module thyristor bridge rated for 800 V single-phase operation with chassis mount packaging in V1A-PAK configuration. This component integrates 2 SCRs and 4 diodes for rectification and switching applications. The part is currently obsolete, making identification of suitable alternatives essential for ongoing system support and new design implementations.

Substiute Parts

VHFD29-08IO1

IXYSIn Stock: 5910VHFD29-08IO1 Datasheet

Current PartRFQ

VHFD37-08IO1

IXYSIn Stock: 7621VHFD37-08IO1 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the VHFD29-08IO1 is determined by strict equivalence in the following parameters:

• Voltage rating: 800 V off-state voltage (primary electrical constraint)
• Package type: V1A-PAK chassis mount configuration (mechanical and thermal interface requirement)
• Structure: Bridge, Single Phase - SCRs/Diodes (Layout 1) (functional topology)
• Gate trigger characteristics: Vgt (Max) 1 V and Igt (Max) 65 mA (control circuit compatibility)
• Operating temperature range: -40°C ~ 125°C (environmental specification)

The VHFD37-08IO1 meets all these criteria. While it provides higher on-state current capability (36 A vs. 28 A) and improved surge current ratings, these represent enhanced performance within the same electrical and mechanical framework, making it a direct substitute for the obsolete VHFD29-08IO1.

Parameter Comparison

Engineering Selection Recommendations

The VHFD37-08IO1 is the direct substitute for the obsolete VHFD29-08IO1. Both components maintain identical electrical specifications for voltage rating, gate trigger characteristics, and operating temperature range. The VHFD37-08IO1 is currently in active production status, ensuring supply chain availability and long-term support.

The VHFD37-08IO1 provides enhanced current handling with a maximum on-state current of 36 A compared to 28 A, and improved non-repetitive surge current ratings (320A/350A vs. 300A/330A). These improvements are backward-compatible with applications designed for the VHFD29-08IO1, as the substitute operates within the same voltage and control parameter envelope.

Both parts maintain ROHS3 compliance and REACH unaffected status, supporting regulatory requirements for modern manufacturing and deployment environments.

Frequently Asked Questions (FAQ)

Q: Can the VHFD37-08IO1 directly replace the VHFD29-08IO1 in existing designs?

A: Yes. The VHFD37-08IO1 maintains identical voltage rating (800 V), gate trigger specifications (Vgt 1 V max, Igt 65 mA max), operating temperature range (-40°C to 125°C), and V1A-PAK chassis mount packaging. The higher on-state current rating (36 A vs. 28 A) is a performance enhancement that does not affect compatibility.

Q: What is the significance of the V1A-PAK package type?

A: V1A-PAK is a standardized chassis mount package for SCR bridge modules. Both the VHFD29-08IO1 and VHFD37-08IO1 use this package, ensuring mechanical fit, thermal interface compatibility, and electrical connection consistency in existing mounting configurations.

Q: Are there compliance differences between the two parts?

A: No. Both the VHFD29-08IO1 and VHFD37-08IO1 are ROHS3 compliant and REACH unaffected, with identical moisture sensitivity levels (MSL 1 - Unlimited). Regulatory and environmental compliance requirements are equivalent.

Q: Why is the VHFD29-08IO1 listed as obsolete?

A: The VHFD29-08IO1 has been discontinued by IXYS. The VHFD37-08IO1 represents the current production equivalent, offering the same functional performance with enhanced current capabilities and active manufacturing support.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution is determined by matching voltage rating (800 V), package type (V1A-PAK), structure (Bridge, Single Phase - SCRs/Diodes Layout 1), gate trigger specifications (Vgt 1 V max, Igt 65 mA max), and operating temperature range (-40°C to 125°C). The VHFD37-08IO1 meets all these criteria.