VTO70-08IO7 Equivalent & Substitute Parts

Part Overview

The VTO70-08IO7 is an 800V three-phase rectifier bridge SCR module manufactured by IXYS in FO-T-A chassis mount packaging. This component integrates six SCRs in a bridge configuration for three-phase power conversion applications. The part is currently obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs requiring similar electrical performance characteristics.

Key Parameters

Parameter	Value
Voltage - Off State	800 V
Current - On State (It (AV)) (Max)	70 A
Voltage - Gate Trigger (Vgt) (Max)	1.5 V
Current - Gate Trigger (Igt) (Max)	100 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	550A, 600A
Current - Hold (Ih) (Max)	200 mA
Operating Temperature Range	-40°C ~ 125°C (TJ)
Mounting Type	Chassis Mount
Package / Case	FO-T-A
Structure	Bridge, 3-Phase - All SCRs
Number of SCRs	6 SCRs

Substitute Part Grouping Explanation

Substitution eligibility for the VTO70-08IO7 is determined by the following critical parameters:

Voltage Rating Compatibility: The off-state voltage must equal or exceed 800V to maintain system protection margins. Substitutes with higher voltage ratings (1.6kV) provide enhanced voltage headroom but remain functionally compatible.

Current Handling Capacity: The on-state average current (It (AV)) must support the application's maximum current demand. The VTO70-08IO7 specifies 70A average current; substitutes with lower ratings (30A, 50A) are suitable only for reduced-current applications.

Gate Trigger Parameters: Voltage and current trigger thresholds (Vgt, Igt) must remain within compatible ranges to ensure reliable gate drive circuit operation. All listed substitutes maintain Vgt ≤ 1.5V and Igt ≤ 100mA.

Surge Current Rating: Non-repetitive surge current (Itsm) values must accommodate transient overcurrent conditions. Substitutes with equal or higher surge ratings ensure equivalent transient protection.

Thermal Operating Range: The -40°C to 125°C range of the VTO70-08IO7 is met or exceeded by all substitutes, with some offering extended upper limits to 150°C.

Mounting and Packaging: Chassis mount configuration is maintained in the MCC26-08IO1B substitute. The CMA series substitutes employ through-hole mounting with i4-Pac™-5 packaging, requiring mechanical redesign.

Parameter Comparison

Parameter	VTO70-08IO7	MCC26-08IO1B	CMA30P1600FC	CMA50P1600FC
Voltage - Off State	800 V	800 V	1.6 kV	1.6 kV
Current - On State (It (AV)) (Max)	70 A	32 A	30 A	50 A
Voltage - Gate Trigger (Vgt) (Max)	1.5 V	1.5 V	1 V	1.4 V
Current - Gate Trigger (Igt) (Max)	100 mA	100 mA	55 mA	80 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	550A, 600A	520A, 560A	400A, 430A	720A, 780A
Current - Hold (Ih) (Max)	200 mA	200 mA	100 mA	100 mA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 150°C	-40°C ~ 150°C
Mounting Type	Chassis Mount	Chassis Mount	Through Hole	Through Hole
Package / Case	FO-T-A	TO-240AA	i4-Pac™-5	i4-Pac™-5
Structure	Bridge, 3-Phase - All SCRs	Series Connection - All SCRs	Series Connection - All SCRs	Series Connection - All SCRs
Number of SCRs	6 SCRs	2 SCRs	2 SCRs	2 SCRs
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

MCC26-08IO1B: This substitute maintains identical voltage rating (800V) and gate trigger parameters (Vgt 1.5V, Igt 100mA) with the VTO70-08IO7. The chassis mount configuration and TO-240AA package enable direct mechanical compatibility. On-state current capacity reduces to 32A average, suitable for applications operating below this threshold. Surge current rating (520A, 560A) remains comparable. RoHS3 compliance and active product status ensure long-term availability. This substitute is optimal for direct replacement in existing designs with current requirements ≤32A.

CMA50P1600FC: This substitute provides the highest on-state current capacity (50A average) among alternatives while maintaining gate trigger compatibility (Vgt 1.4V, Igt 80mA). The 1.6kV voltage rating exceeds the original specification, providing enhanced voltage margin. Surge current rating (720A, 780A) surpasses the original part. Extended operating temperature range (-40°C to 150°C) offers thermal flexibility. Through-hole mounting and i4-Pac™-5 packaging require mechanical redesign. RoHS3 compliance and active status support long-term supply. This substitute addresses applications requiring current capacity between 32A and 50A with higher voltage headroom.

CMA30P1600FC: This substitute provides the lowest on-state current capacity (30A average) and is suitable only for reduced-current applications. The 1.6kV voltage rating and gate trigger parameters (Vgt 1V, Igt 55mA) remain compatible. Through-hole mounting and i4-Pac™-5 packaging require mechanical redesign. RoHS3 compliance and active status ensure availability. This substitute is applicable only when current requirements do not exceed 30A average.

Frequently Asked Questions (FAQ)

Q: Can the CMA series substitutes directly replace the VTO70-08IO7 without circuit modification?

A: No. The CMA series employs series connection topology with two SCRs versus the original bridge configuration with six SCRs. Additionally, through-hole i4-Pac™-5 packaging differs from FO-T-A chassis mount. Circuit redesign is required to accommodate the different topology and mounting method.

Q: What is the primary limitation when selecting CMA30P1600FC or CMA50P1600FC?

A: The on-state current capacity is reduced compared to the VTO70-08IO7 (70A). CMA30P1600FC supports maximum 30A average current, and CMA50P1600FC supports 50A average current. Applications requiring the full 70A capacity cannot use these substitutes.

Q: Why does MCC26-08IO1B offer better mechanical compatibility?

A: MCC26-08IO1B maintains chassis mount configuration and TO-240AA packaging, enabling direct mechanical installation in existing designs. The CMA series requires through-hole mounting with i4-Pac™-5 packaging, necessitating PCB redesign and mechanical rework.

Q: Are all substitutes RoHS compliant?

A: MCC26-08IO1B, CMA30P1600FC, and CMA50P1600FC are all RoHS3 compliant. The original VTO70-08IO7 does not specify RoHS status. All substitutes carry REACH Unaffected designation.

Q: What is the voltage rating advantage of the CMA series?

A: The CMA series operates at 1.6kV off-state voltage versus 800V for the VTO70-08IO7 and MCC26-08IO1B. This higher rating provides additional voltage margin in applications with transient overvoltage conditions, though it does not affect compatibility with 800V system designs.

Q: How do gate trigger parameters affect circuit design?

A: Gate trigger voltage (Vgt) and current (Igt) determine gate drive circuit requirements. All substitutes maintain Vgt ≤ 1.5V and Igt ≤ 100mA, ensuring compatibility with existing gate drive circuits designed for the VTO70-08IO7. The CMA series offers lower trigger thresholds (Vgt 1V, Igt 55-80mA), potentially reducing gate drive power consumption.

Q: What inventory status should influence substitution decisions?

A: All three substitutes are active products with substantial inventory availability (729-973 pieces). The VTO70-08IO7 is obsolete with limited remaining stock (748 pieces). For new designs or long-term production, active substitutes ensure supply continuity.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message