MCT2202W Optoisolator Equivalent & Substitute Parts

Part Overview

The MCT2202W is a 6-DIP optoisolator transistor with base output manufactured by onsemi, featuring 5300Vrms isolation voltage and a current transfer ratio of 63% to 125% at 10mA. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The MCT2202W serves applications requiring galvanic isolation with transistor output capability in through-hole mounting configurations.

Key Parameters

Parameter	Value
Manufacturer Part Number	MCT2202W
Manufacturer	onsemi
Category	Optoisolators
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
Voltage - Forward (Vf) (Typ)	1.25V
Current - DC Forward (If) (Max)	100mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 100°C
Mounting Type	Through Hole
Package / Case	6-DIP (0.400", 10.16mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MCT2202W is determined by the following critical parameters:

Isolation Voltage: Minimum 5000Vrms (MCT2202W operates at 5300Vrms)
Output Type: Transistor with Base configuration
Number of Channels: Single channel
Mounting Type: Through Hole, 6-DIP package
Operating Temperature Range: -55°C to 100°C minimum
Current Transfer Ratio: Minimum 20% @ 10mA acceptable for most applications
Output Current Capability: 50mA minimum per channel
Maximum Output Voltage: 30V minimum

Substitute parts are grouped into two categories based on isolation voltage rating:

Category A - High Isolation (5000Vrms): 4N25 (Texas Instruments), 4N25-V (Everlight Electronics), 4N25-X000 (Vishay), 4N25-X001 (Vishay). These parts maintain isolation voltage within 300Vrms of the original specification.

Category B - Lower Isolation (2500Vrms): 4N25-000E, 4N25-060E, 4N25-W00E, 4N25-W60E (Broadcom Limited). These parts provide reduced isolation voltage but maintain all other critical electrical and mechanical parameters.

Parameter Comparison

Parameter	MCT2202W (onsemi)	4N25 (TI)	4N25-V (Everlight)	4N25-X000 (Vishay)	4N25-X001 (Vishay)	4N25-000E (Broadcom)	4N25-060E (Broadcom)	4N25-W00E (Broadcom)	4N25-W60E (Broadcom)
Voltage - Isolation	5300Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	2500Vrms	2500Vrms	2500Vrms	2500Vrms
Current Transfer Ratio (Min)	63% @ 10mA	20% @ 10mA	20% @ 10mA	20% @ 10mA	20% @ 10mA	20% @ 10mA	20% @ 10mA	20% @ 10mA	20% @ 10mA
Turn On / Turn Off Time (Typ)	2µs, 2µs	—	3µs, 3µs	—	—	—	—	—	—
Rise / Fall Time (Typ)	—	2µs, 2µs	—	2µs, 2µs	2µs, 2µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs
Output Type	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base
Voltage - Output (Max)	30V	70V	80V	70V	70V	30V	30V	30V	30V
Current - Output / Channel	50mA	50mA	—	50mA	50mA	100mA	100mA	100mA	100mA
Voltage - Forward (Vf) (Typ)	1.25V	1.3V	1.2V	1.36V	1.36V	1.2V	1.2V	1.2V	1.2V
Current - DC Forward (If) (Max)	100mA	60mA	60mA	60mA	60mA	80mA	80mA	80mA	80mA
Vce Saturation (Max)	400mV	500mV	500mV	500mV	500mV	500mV	500mV	500mV	500mV
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 110°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Package / Case	6-DIP (0.400", 10.16mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.400", 10.16mm)	6-DIP (0.400", 10.16mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	—	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Equivalent Isolation Performance:

Select 4N25-X000 or 4N25-X001 (Vishay Semiconductor Opto Division) when isolation voltage specification of 5000Vrms is required. Both parts maintain active product status and ROHS3 compliance. The 4N25-X000 and 4N25-X001 are functionally identical with identical electrical specifications; selection between them depends on packaging preference (standard or tube).

Alternatively, 4N25 (Texas Instruments) provides 5000Vrms isolation but carries RoHS non-compliant status. The 4N25-V (Everlight Electronics) offers 5000Vrms isolation with ROHS3 compliance and extended operating temperature range to 110°C.

For Applications Tolerant of Reduced Isolation Voltage:

The 4N25-000E, 4N25-060E, 4N25-W00E, and 4N25-W60E (Broadcom Limited) all provide 2500Vrms isolation with ROHS3 compliance and active product status. These parts offer higher output current capability (100mA vs. 50mA) and are suitable for applications where 2500Vrms isolation meets system requirements. Package selection between 0.300" (7.62mm) and 0.400" (10.16mm) DIP width depends on PCB layout constraints.

Compliance Considerations:

All recommended active substitutes except 4N25 (Texas Instruments) meet ROHS3 compliance requirements. For new designs requiring RoHS compliance, exclude the 4N25 part number.

Frequently Asked Questions (FAQ)

Q: Can the 4N25 series directly replace the MCT2202W?

A: The 4N25 series maintains the same 6-DIP through-hole package configuration, single-channel transistor output with base, and operating temperature range. However, isolation voltage differs: MCT2202W operates at 5300Vrms while most 4N25 variants provide 5000Vrms. The 4N25-000E and related Broadcom variants provide only 2500Vrms isolation. Substitution is valid only when the application isolation voltage requirement does not exceed the substitute part's rating.

Q: What is the significance of the package width difference (0.300" vs. 0.400")?

A: The MCT2202W uses a 6-DIP package with 0.400" (10.16mm) width. Most 4N25 variants use 0.300" (7.62mm) width. This affects PCB footprint and pin spacing. The 4N25-W00E, 4N25-W60E, and MCT2202W all use 0.400" width and are mechanically interchangeable. Substitutes with 0.300" width require PCB layout modification.

Q: Why does the MCT2202W have higher current transfer ratio specifications than the 4N25 series?

A: The MCT2202W specifies 63% to 125% current transfer ratio at 10mA, while 4N25 variants specify 20% minimum. This reflects different LED drive characteristics and phototransistor design. The higher CTR of MCT2202W provides better signal transfer efficiency but does not prevent substitution with lower-CTR parts in applications designed for the 4N25 series.

Q: Is the 4N25-V suitable for high-temperature applications?

A: The 4N25-V (Everlight Electronics) extends the operating temperature range to -55°C to 110°C, compared to -55°C to 100°C for most other variants. This additional 10°C upper limit may be beneficial for applications operating near thermal limits, though the MCT2202W and most 4N25 variants are rated only to 100°C.

Q: What compliance certifications should I verify before selecting a substitute?

A: All active substitute parts carry REACH Unaffected or REACH Affected status and ECCN EAR99 classification. RoHS compliance varies: 4N25 (Texas Instruments) is RoHS non-compliant, while all Broadcom and Vishay variants are ROHS3 compliant. For new designs, select ROHS3-compliant parts. Moisture sensitivity level is 1 (Unlimited) across all parts, indicating no special storage requirements.

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