VHO55-14IO7 Equivalent & Substitute Parts

Part Overview

The VHO55-14IO7 is a single-phase SCR bridge rectifier module rated for 1.4 kV off-state voltage with integrated SCRs and diodes in a chassis-mount FO-T-A package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. Substitute parts must maintain compatibility across voltage ratings, current handling capacity, thermal characteristics, and mounting requirements.

Key Parameters

Parameter	VHO55-14IO7
Voltage - Off State	1.4 kV
Current - On State (It (AV)) (Max)	53 A
Voltage - Gate Trigger (Vgt) (Max)	1.5 V
Current - Gate Trigger (Igt) (Max)	100 mA
Current - Non Rep. Surge (50/60Hz)	550A / 600A
Current - Hold (Ih) (Max)	200 mA
Operating Temperature Range	-40°C to 125°C (TJ)
Mounting Type	Chassis Mount
Package / Case	FO-T-A
Structure	Bridge, Single Phase - SCRs/Diodes (Layout 1)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the VHO55-14IO7 is determined by the following critical parameters:

Voltage Rating: Off-state voltage must equal or exceed 1.4 kV
Current Capacity: On-state average current must support the application's maximum current demand
Gate Trigger Characteristics: Vgt and Igt parameters must remain within specified limits for gate drive compatibility
Thermal Operating Range: Must accommodate the application's temperature environment
Mounting Configuration: Chassis mount requirement must be maintained
Regulatory Compliance: RoHS3 and REACH compliance status must be verified

The identified substitute parts operate under different structural configurations (series connection vs. bridge configuration) and packaging formats, requiring careful parameter alignment during selection.

Parameter Comparison

Parameter	VHO55-14IO7	MCD26-14IO1B	MCD40-16IO6
Manufacturer	IXYS	IXYS	IXYS
Category	Thyristors	Thyristors	Thyristors
Voltage - Off State	1.4 kV	1.4 kV	1.6 kV
Current - On State (It (AV)) (Max)	53 A	32 A	38 A
Current - On State (It (RMS)) (Max)	—	50 A	60 A
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V	1.5 V
Current - Gate Trigger (Igt) (Max)	100 mA	100 mA	100 mA
Current - Non Rep. Surge (50Hz)	550 A	520 A	500 A
Current - Non Rep. Surge (60Hz)	600 A	560 A	440 A
Current - Hold (Ih) (Max)	200 mA	200 mA	200 mA
Operating Temperature Range	-40°C to 125°C	-40°C to 125°C	-40°C to 150°C
Mounting Type	Chassis Mount	Chassis Mount	Chassis Mount
Package / Case	FO-T-A	TO-240AA	SOT-227-4, miniBLOC
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

MCD26-14IO1B: This substitute maintains identical off-state voltage (1.4 kV) and gate trigger specifications. However, the on-state average current rating of 32 A is lower than the VHO55-14IO7's 53 A specification. This part is suitable only for applications where the actual current demand does not exceed 32 A average or 50 A RMS. The part is currently active in production with full RoHS3 and REACH compliance. Package transition from FO-T-A to TO-240AA requires mechanical redesign of the mounting interface.

MCD40-16IO6: This substitute provides higher off-state voltage (1.6 kV) and extended operating temperature range (-40°C to 150°C). The on-state average current rating of 38 A remains below the original 53 A specification. This part is suitable for applications requiring higher voltage margin or elevated temperature operation, provided current demand does not exceed 38 A average or 60 A RMS. The part is currently active in production with full RoHS3 and REACH compliance. Package transition from FO-T-A to SOT-227-4 miniBLOC requires mechanical redesign of the mounting interface.

Both substitute parts are active products with established supply chains, addressing the obsolescence status of the VHO55-14IO7.

Frequently Asked Questions (FAQ)

Q: Can MCD26-14IO1B directly replace VHO55-14IO7 in existing designs?

A: Direct replacement requires verification that the application's maximum on-state current does not exceed 32 A average or 50 A RMS. The package change from FO-T-A to TO-240AA necessitates mechanical redesign of the mounting assembly. Gate trigger specifications are compatible.

Q: What is the primary difference between the bridge configuration of VHO55-14IO7 and the series connection structure of MCD26-14IO1B and MCD40-16IO6?

A: The VHO55-14IO7 integrates two SCRs and two diodes in a bridge configuration suitable for single-phase rectification. The MCD26-14IO1B and MCD40-16IO6 employ series connection topology with one SCR and one diode each, requiring different circuit integration approaches. Substitution is valid only when the application circuit topology can accommodate the series connection structure.

Q: Is MCD40-16IO6 a higher-performance alternative to VHO55-14IO7?

A: MCD40-16IO6 offers higher voltage rating (1.6 kV vs. 1.4 kV) and extended temperature range (-40°C to 150°C vs. -40°C to 125°C). However, on-state current capacity is lower (38 A average vs. 53 A). Selection depends on whether the application prioritizes voltage margin and thermal headroom over current capacity.

Q: Are all three parts RoHS3 and REACH compliant?

A: Yes. VHO55-14IO7, MCD26-14IO1B, and MCD40-16IO6 are all ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements for electronic component procurement.

Q: What packaging considerations apply when transitioning from VHO55-14IO7?

A: The original FO-T-A package differs mechanically from TO-240AA (MCD26-14IO1B) and SOT-227-4 miniBLOC (MCD40-16IO6). Substitution requires redesign of the mounting interface, thermal management solution, and PCB layout to accommodate the new package footprint and pin configuration.

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