MCT61W Equivalent & Substitute Parts

Part Overview

The MCT61W is a 2-channel optoisolator with transistor output manufactured by onsemi, rated for 5000Vrms isolation voltage. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The MCT61W provides DC input with transistor output configuration, suitable for applications requiring galvanic isolation in industrial and consumer electronics.

Substiute Parts

MCT61W

onsemiIn Stock: 1212MCT61W Datasheet

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MCT61

Fairchild SemiconductorIn Stock: 2553MCT61 Datasheet

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MCT61G

Isocom Components 2004 LTDIn Stock: 901MCT61G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MCT61W are qualified based on the following critical parameters that determine functional compatibility:

• Number of Channels: Must be 2
• Output Type: Must be Transistor
• Voltage - Isolation: Minimum 5000Vrms
• Current Transfer Ratio (Min): Minimum 50% @ 5mA
• Voltage - Output (Max): Minimum 30V
• Current - Output / Channel: Minimum 30mA
• Vce Saturation (Max): Maximum 400mV
• Package / Case: 8-DIP form factor
• Input Type: DC

The MCT61 (Fairchild Semiconductor) and MCT61G (Isocom Components 2004 LTD) meet these electrical and mechanical requirements and are listed as direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

The MCT61 (Fairchild Semiconductor) and MCT61G (Isocom Components 2004 LTD) are both active products suitable for replacing the obsolete MCT61W. Selection between these substitutes depends on specific application requirements:

The MCT61 (Fairchild) maintains identical electrical specifications to the MCT61W, including isolation voltage, current transfer ratio, switching times, and operating temperature range. Package dimensions differ slightly (0.300" vs 0.400"), which may affect PCB layout compatibility.

The MCT61G (Isocom) offers enhanced isolation voltage (5300Vrms vs 5000Vrms) and higher output current capability (50mA vs 30mA per channel). Operating temperature range is reduced to -25°C ~ 100°C. Rise and fall times are specified at 4µs and 3µs respectively, differing from the MCT61W's turn-on/turn-off times. The MCT61G maintains the original 0.400" package dimension and carries RoHS3 compliance certification.

Both substitutes meet the core electrical requirements for 2-channel transistor output optoisolation at 5000Vrms minimum isolation voltage.

Frequently Asked Questions (FAQ)

Q: Can MCT61 and MCT61G be used interchangeably with MCT61W?

A: Both MCT61 and MCT61G meet the minimum electrical specifications for MCT61W substitution. However, package dimensions and operating temperature ranges differ. Verify PCB layout compatibility and temperature requirements for your specific application before selection.

Q: What is the primary difference between MCT61 and MCT61G?

A: The MCT61G provides higher isolation voltage (5300Vrms vs 5000Vrms) and greater output current per channel (50mA vs 30mA). The MCT61G has a reduced operating temperature minimum of -25°C compared to -55°C for MCT61. The MCT61G maintains the original 0.400" package dimension, while MCT61 uses 0.300".

Q: Are there compliance differences between the substitute parts?

A: MCT61G carries RoHS3 compliance certification. Both MCT61 and MCT61W are subject to the same ECCN (EAR99) and HTSUS classifications. Verify compliance requirements for your end application and region.

Q: Does package dimension affect circuit performance?

A: Package dimension differences (0.300" vs 0.400" DIP width) affect PCB layout and board spacing but do not impact electrical performance. Verify that your PCB design accommodates the selected package before implementation.

Q: What switching time specifications should I consider?

A: MCT61W and MCT61 specify turn-on/turn-off times of 2.4µs. MCT61G specifies rise and fall times of 4µs and 3µs respectively. These timing parameters may affect circuit performance in high-speed switching applications. Confirm timing requirements for your circuit design.