MCT2202SD Equivalent & Substitute Parts

Part Overview

The MCT2202SD is an optoisolator transistor with base output manufactured by onsemi, featuring 5300Vrms isolation voltage and single-channel configuration in 6-SMD surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The MCT2202SD provides DC input with transistor output including base connection, suitable for applications requiring galvanic isolation with moderate current switching capability.

Substiute Parts

MCT2202SD

onsemiIn Stock: 970MCT2202SD Datasheet

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CNY172SR2M

Fairchild SemiconductorIn Stock: 4658CNY172SR2M Datasheet

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MCT2202SM

Isocom Components 2004 LTDIn Stock: 1062MCT2202SM Datasheet

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MCT2202SMT&R

Isocom Components 2004 LTDIn Stock: 932MCT2202SMT&R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MCT2202SD is determined by the following critical parameters:

• Isolation Voltage: Minimum 4170Vrms (CNY172SR2M meets 4170Vrms; MCT2202SM and MCT2202SMT&R operate at 7.5Vpk, which is significantly lower)
• Current Transfer Ratio: 63% minimum and 125% maximum @ 10mA (all substitutes match this specification)
• Output Configuration: Transistor with Base output required (all substitutes provide this)
• Switching Speed: Turn-on/turn-off time specifications (CNY172SR2M: 2µs/3µs; MCT2202SM and MCT2202SMT&R: 10µs/10µs maximum)
• Package: 6-SMD, Gull Wing surface mount (all substitutes match)
• Operating Temperature Range: -55°C to 100°C (MCT2202SD and MCT2202SM/MCT2202SMT&R match; CNY172SR2M operates -40°C to 100°C)

The CNY172SR2M from Fairchild Semiconductor is the closest functional equivalent with active product status and comparable isolation voltage. The MCT2202SM and MCT2202SMT&R variants from Isocom Components are mechanical and functional equivalents but feature significantly reduced isolation voltage specification (7.5Vpk versus 5300Vrms).

Parameter Comparison

Engineering Selection Recommendations

CNY172SR2M (Fairchild Semiconductor) is the primary substitute for the MCT2202SD. This part maintains active product status, ensuring long-term availability and supply chain stability. The isolation voltage of 4170Vrms is lower than the original 5300Vrms specification but remains suitable for applications not requiring the full isolation rating. Switching speed is comparable (2µs turn-on versus 2µs original; 3µs turn-off versus 2µs original). The higher maximum output voltage (70V versus 30V) provides additional design margin. The operating temperature range is narrower (-40°C to 100°C versus -55°C to 100°C), which may be a constraint for low-temperature applications.

MCT2202SM and MCT2202SMT&R (Isocom Components 2004 LTD) are mechanical and functional equivalents with active product status and ROHS3 compliance. These parts share the same base product number (MCT220 series) and identical current transfer ratio specifications. However, the isolation voltage specification of 7.5Vpk is substantially lower than the MCT2202SD and CNY172SR2M, making these substitutes suitable only for applications with reduced isolation requirements. The extended switching time (10µs maximum versus 2µs typical) may impact circuit performance in time-critical applications. The MCT2202SMT&R variant is supplied in Tape & Reel packaging, while MCT2202SM is supplied in Tube packaging.

Selection should prioritize isolation voltage requirements and switching speed constraints specific to the application circuit.

Frequently Asked Questions (FAQ)

Q: Can the CNY172SR2M directly replace the MCT2202SD?

A: The CNY172SR2M is functionally compatible as a substitute. Both parts feature single-channel transistor output with base connection, identical current transfer ratio specifications, and matching 6-SMD gull wing packaging. The primary difference is isolation voltage: CNY172SR2M provides 4170Vrms versus MCT2202SD's 5300Vrms. Applications requiring the full 5300Vrms isolation rating cannot use CNY172SR2M. Switching speed is comparable (CNY172SR2M: 2µs/3µs turn-on/turn-off versus MCT2202SD: 2µs/2µs).

Q: What is the difference between MCT2202SM and MCT2202SMT&R?

A: Both parts are functionally identical with matching electrical specifications. The difference is packaging format: MCT2202SM is supplied in Tube packaging, while MCT2202SMT&R is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements and volume handling procedures.

Q: Why is the isolation voltage lower on the Isocom parts?

A: The MCT2202SM and MCT2202SMT&R specify isolation voltage as 7.5Vpk, which represents a different measurement standard or specification methodology compared to the 5300Vrms and 4170Vrms ratings of the onsemi and Fairchild parts. These Isocom variants are suitable only for applications with reduced isolation voltage requirements.

Q: Are all substitutes compatible with the original PCB layout?

A: Yes. All substitute parts use identical 6-SMD gull wing surface mount packaging, ensuring mechanical compatibility with existing PCB layouts and assembly processes without modification.

Q: Which substitute has the best long-term availability?

A: CNY172SR2M from Fairchild Semiconductor carries active product status, indicating ongoing manufacturing and distribution support. MCT2202SM and MCT2202SMT&R from Isocom also carry active status. The MCT2202SD is obsolete and should be replaced in new designs.

Q: What are the temperature range differences?

A: MCT2202SD and MCT2202SM/MCT2202SMT&R operate across -55°C to 100°C. CNY172SR2M operates across -40°C to 100°C, which is narrower at the low end. Applications requiring operation below -40°C must use MCT2202SD, MCT2202SM, or MCT2202SMT&R.

Q: Can I use these parts interchangeably in my circuit?

A: Interchangeability depends on specific application requirements. All parts share identical current transfer ratio specifications and output configuration. Critical differences are isolation voltage, switching speed, and operating temperature range. Circuit validation is necessary when substituting, particularly if the application relies on the full 5300Vrms isolation rating or extended low-temperature operation.