MCT6 Optoisolator Equivalent & Substitute Parts

Part Overview

The MCT6 is a 2-channel optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. This component provides 5300Vrms isolation voltage and is designed for DC input applications requiring galvanic isolation in 8-DIP through-hole packages. The main part is currently in Last Time Buy status, making equivalent substitutes necessary for continued design support and procurement planning.

Key Parameters

Parameter	Value
Number of Channels	2
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	20% @ 10mA
Output Type	Transistor
Voltage - Output (Max)	30V
Current - Output / Channel	30mA
Vce Saturation (Max)	400mV
Operating Temperature	-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 eligibility for the MCT6 is determined by the following critical parameters:

Package compatibility: 8-DIP (0.300", 7.62mm) through-hole mounting
Channel configuration: 2-channel transistor output
Isolation voltage: Minimum 5000Vrms (MCT6 specifies 5300Vrms)
Output specifications: Maximum 30V, 30mA per channel
Saturation voltage: Maximum 400mV Vce
Operating temperature range: -55°C to 100°C
Input type: DC
Current transfer ratio: Minimum 20% @ 10mA

All substitute parts listed maintain these core electrical and mechanical parameters within acceptable tolerances for direct replacement in existing designs.

Parameter Comparison

Parameter	MCT6 (Vishay)	MCT6 (onsemi)	MCT61 (Fairchild)	MCT62 (onsemi)
Manufacturer	Vishay Semiconductor Opto Division	onsemi	Fairchild Semiconductor	onsemi
Number of Channels	2	2	2	2
Voltage - Isolation	5300Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	20% @ 10mA	20% @ 10mA	50% @ 5mA	100% @ 5mA
Turn On / Turn Off Time (Typ)	3µs, 3µs	2.4µs, 2.4µs	2.4µs, 2.4µs	2.4µs, 2.4µs
Voltage - Output (Max)	30V	30V	30V	30V
Current - Output / Channel	30mA	30mA	30mA	30mA
Voltage - Forward (Vf) (Typ)	1.25V	1.2V	1.2V	1.2V
Vce Saturation (Max)	400mV	400mV	400mV	400mV
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
Product Status	Last Time Buy	Active	Active	Active

Engineering Selection Recommendations

MCT6 (onsemi): This part maintains identical electrical specifications to the Vishay MCT6 with the exception of isolation voltage (5000Vrms vs. 5300Vrms) and switching speed improvement (2.4µs vs. 3µs). ROHS3 compliance and active product status support long-term availability. Suitable for applications where the 300Vrms isolation margin reduction is acceptable.

MCT61 (Fairchild Semiconductor): Offers higher current transfer ratio (50% @ 5mA) compared to the original specification (20% @ 10mA), providing improved optical coupling efficiency. Active product status and identical package/electrical output specifications enable direct substitution. Compliance certifications not fully specified in available data.

MCT62 (onsemi): Provides the highest current transfer ratio (100% @ 5mA) among substitute options, delivering superior optical coupling performance. ROHS3 compliance and active product status ensure procurement continuity. Identical electrical output and package specifications support direct replacement.

Frequently Asked Questions (FAQ)

Q: Can MCT6 (onsemi) replace the Vishay MCT6 in all applications?

A: The onsemi MCT6 is electrically compatible for most applications. The isolation voltage difference (5000Vrms vs. 5300Vrms) represents a 300Vrms reduction. Applications requiring the full 5300Vrms isolation margin should evaluate system requirements before substitution.

Q: What is the advantage of MCT62 over the original MCT6?

A: The MCT62 provides a current transfer ratio of 100% @ 5mA, compared to the MCT6's 20% @ 10mA. This higher efficiency improves optical coupling performance and may reduce input current requirements in certain circuit topologies.

Q: Are all substitute parts pin-compatible with the MCT6?

A: Yes. All substitute parts use the 8-DIP (0.300", 7.62mm) through-hole package with identical pin configuration, enabling direct PCB replacement without layout modifications.

Q: Which substitute offers the fastest switching performance?

A: MCT6 (onsemi), MCT61, and MCT62 all provide 2.4µs turn-on and turn-off times, compared to the original MCT6's 3µs specification. This represents a 20% improvement in switching speed.

Q: Are all substitutes RoHS3 compliant?

A: MCT6 (onsemi) and MCT62 (onsemi) are explicitly ROHS3 compliant. MCT61 (Fairchild) compliance status is not specified in available documentation.

Q: What is the inventory status of substitute parts?

A: MCT6 (onsemi): 174,300 pcs. MCT61 (Fairchild): 2,510 pcs. MCT62 (onsemi): 5,232 pcs. All parts are available as new original stock.

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