MCT2202S Equivalent & Substitute Parts

Part Overview

The MCT2202S 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 MCT2202S provides DC input with transistor output including base connection, suitable for applications requiring galvanic isolation with moderate current handling.

Key Parameters

Parameter	MCT2202S
Manufacturer	onsemi
Product Status	Obsolete
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	63% @ 10mA
Current Transfer Ratio (Max)	125% @ 10mA
Turn On / Turn Off Time (Typ)	2µs, 2µs
Output Type	Transistor with Base
Voltage - Output (Max)	30V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	6-SMD, Gull Wing

Substitute Part Grouping Explanation

Substitution eligibility for the MCT2202S is determined by the following critical parameters:

Number of Channels: Must be 1 (single channel)
Output Type: Must be Transistor with Base
Mounting Type: Must be Surface Mount
Package / Case: Must be 6-SMD, Gull Wing
Current Transfer Ratio: Must maintain 63% (Min) and 125% (Max) @ 10mA
Vce Saturation (Max): Must not exceed 400mV
Input Type: Must be DC

The substitute parts identified below meet these core electrical and mechanical requirements. Variations in isolation voltage, output voltage rating, and operating temperature range are permissible within the scope of component substitution, provided the application requirements accommodate these differences.

Parameter Comparison

Parameter	MCT2202S (onsemi)	CNY172SM (Fairchild)	MCT2202SM (Isocom)	MCT2202SMT&R (Isocom)
Number of Channels	1	1	1	1
Voltage - Isolation	5300Vrms	4170Vrms	7.5Vpk	7.5Vpk
Current Transfer Ratio (Min)	63% @ 10mA	63% @ 10mA	63% @ 10mA	63% @ 10mA
Current Transfer Ratio (Max)	125% @ 10mA	125% @ 10mA	125% @ 10mA	125% @ 10mA
Turn On / Turn Off Time (Typ)	2µs, 2µs	2µs, 3µs	10µs, 10µs (Max)	10µs, 10µs (Max)
Output Type	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base
Voltage - Output (Max)	30V	70V	30V	30V
Current - Output / Channel	50mA	50mA	—	—
Vce Saturation (Max)	400mV	400mV	400mV	400mV
Operating Temperature	-55°C ~ 100°C	-40°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

CNY172SM (Fairchild Semiconductor): Active product status with full availability. Meets all core electrical parameters. Lower isolation voltage (4170Vrms vs. 5300Vrms) requires application verification if isolation rating is critical. Higher output voltage rating (70V vs. 30V) provides additional design margin. Operating temperature range reduced to -40°C ~ 100°C; verify compatibility with application requirements.

MCT2202SM (Isocom Components 2004 LTD): Active product status with RoHS3 compliance. Identical operating temperature range and output voltage rating to MCT2202S. Significantly lower isolation voltage specification (7.5Vpk) represents a substantial reduction from the original 5300Vrms; substitution requires explicit application-level validation. Slower switching response (10µs vs. 2µs) may impact timing-sensitive circuits.

MCT2202SMT&R (Isocom Components 2004 LTD): Active product status with RoHS3 compliance and tape & reel packaging. Electrically identical to MCT2202SM. Packaging format (Tape & Reel) differs from the original; confirm compatibility with assembly processes.

Frequently Asked Questions (FAQ)

Q: Can CNY172SM replace MCT2202S in all applications? A: CNY172SM meets the core electrical and mechanical substitution criteria. However, the isolation voltage is reduced from 5300Vrms to 4170Vrms. Applications requiring the full 5300Vrms isolation rating must be re-evaluated. The higher output voltage rating (70V) is generally compatible with designs expecting 30V maximum.

Q: What is the primary limitation of the Isocom MCT2202SM and MCT2202SMT&R substitutes? A: The isolation voltage specification is significantly lower (7.5Vpk) compared to the original MCT2202S (5300Vrms). This represents a critical parameter change and requires application-level validation before substitution. Additionally, switching response is slower (10µs vs. 2µs), which may affect timing-dependent circuits.

Q: Are the Isocom parts (MCT2202SM and MCT2202SMT&R) functionally identical? A: Yes, electrically and mechanically identical. The difference is packaging format: MCT2202SM is supplied in Tube packaging, while MCT2202SMT&R is supplied in Tape & Reel format. Select based on assembly process requirements.

Q: What compliance certifications apply to these substitute parts? A: CNY172SM carries EAR99 classification. MCT2202SM and MCT2202SMT&R are RoHS3 compliant with EAR99 classification and REACH Unaffected status. Verify compliance requirements for your specific application and region.

Q: Is the 6-SMD, Gull Wing package identical across all parts? A: All four parts use 6-SMD, Gull Wing surface mount packaging, ensuring mechanical compatibility with existing PCB layouts and assembly equipment.

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