MCT6H Optoisolator - Equivalent & Substitute Parts

Part Overview

The MCT6H is a 2-channel optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. It provides 5300Vrms isolation voltage and is designed for applications requiring high-voltage galvanic isolation with DC input control. The MCT6H is currently in Last Time Buy status, making identification of suitable substitute components necessary for long-term design continuity and procurement planning.

Key Parameters

Parameter	MCT6H Specification
Number of Channels	2
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	50% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	70V
Current - Output / Channel	50mA
Vce Saturation (Max)	300mV
Operating Temperature Range	-55°C ~ 100°C
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the MCT6H is evaluated based on the following critical parameters that define functional compatibility:

Channel Configuration: Both parts must provide 2-channel operation
Isolation Voltage: Minimum 5000Vrms required; higher ratings are acceptable
Current Transfer Ratio: Minimum 50% @ 5mA; higher ratios acceptable
Output Type: Transistor output required
Maximum Output Voltage: Minimum 35V required; higher ratings acceptable
Output Current per Channel: Minimum 50mA required
Package Compatibility: 8-DIP (0.300", 7.62mm) form factor required for PCB compatibility
Mounting Type: Through Hole required
Compliance: ROHS3 compliance required

The LTV-829 from LITEON meets these substitution criteria with equivalent or superior electrical characteristics in the specified parameters.

Parameter Comparison

Parameter	MCT6H (Vishay)	LTV-829 (LITEON)	Compatibility Notes
Number of Channels	2	2	Equivalent
Voltage - Isolation	5300Vrms	5000Vrms	LTV-829 rated 300Vrms lower; acceptable for applications not requiring maximum isolation margin
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	Equivalent minimum; LTV-829 specifies maximum of 400% @ 5mA
Output Type	Transistor	Transistor	Equivalent
Voltage - Output (Max)	70V	35V	MCT6H rated 35V higher; verify application does not exceed 35V collector voltage
Current - Output / Channel	50mA	50mA	Equivalent
Vce Saturation (Max)	300mV	200mV	LTV-829 superior; lower saturation voltage
Operating Temperature Range	-55°C ~ 100°C	-25°C ~ 100°C	MCT6H supports 30°C lower minimum temperature; verify application temperature requirements
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	Equivalent; direct PCB footprint compatibility
Mounting Type	Through Hole	Through Hole	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent

Engineering Selection Recommendations

MCT6H (Vishay) - Primary Selection

Use the MCT6H when:

Applications require maximum isolation voltage margin (5300Vrms)
Operating temperature extends below -25°C
Collector voltage requirements exceed 35V
Last Time Buy inventory is available and procurement timeline permits

LTV-829 (LITEON) - Substitute Selection

The LTV-829 is a qualified substitute when:

Application isolation voltage requirement is 5000Vrms or lower
Operating temperature range is -25°C to 100°C
Collector voltage does not exceed 35V
Lower Vce saturation voltage (200mV vs 300mV) provides performance advantage
Active product status ensures long-term availability and supply continuity
ROHS3 compliance meets regulatory requirements

Both parts carry equivalent compliance certifications (ROHS3, EAR99, HTSUS 8541.49.8000).

Frequently Asked Questions (FAQ)

Q: Can the LTV-829 directly replace the MCT6H in existing designs?

A: Direct replacement is possible if the application meets three conditions: (1) isolation voltage requirement does not exceed 5000Vrms, (2) collector voltage does not exceed 35V, and (3) minimum operating temperature is -25°C or higher. The 8-DIP package footprint is identical, enabling direct PCB substitution without layout modification.

Q: What is the isolation voltage difference between MCT6H and LTV-829?

A: The MCT6H provides 5300Vrms isolation while the LTV-829 provides 5000Vrms. The 300Vrms difference represents a 5.7% reduction. Applications with isolation voltage margins above 5000Vrms can accommodate this difference without functional impact.

Q: Are there temperature range limitations with the LTV-829?

A: Yes. The LTV-829 operates from -25°C to 100°C, while the MCT6H operates from -55°C to 100°C. If the application requires operation below -25°C, the MCT6H is required. Verify the actual minimum operating temperature of your application before selecting the LTV-829.

Q: What is the significance of the maximum collector voltage difference?

A: The MCT6H supports 70V maximum collector voltage while the LTV-829 supports 35V. If your circuit applies collector voltages exceeding 35V, the MCT6H must be used. Verify the actual collector voltage in your application circuit before substitution.

Q: Does the lower Vce saturation voltage of the LTV-829 provide any advantage?

A: Yes. The LTV-829 has a maximum Vce saturation of 200mV compared to 300mV for the MCT6H. This 100mV difference reduces power dissipation in the output transistor, which can improve thermal performance in applications with high output current or frequent switching.

Q: Are both parts RoHS compliant?

A: Yes. Both the MCT6H and LTV-829 are ROHS3 compliant and carry identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications.

Q: What is the current transfer ratio specification for each part?

A: Both parts specify a minimum current transfer ratio of 50% @ 5mA. The LTV-829 additionally specifies a maximum of 400% @ 5mA, providing a defined upper limit. This specification ensures predictable gain characteristics across the operating range.

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