MOC8111 Equivalent & Substitute Parts

Part Overview

The MOC8111 is a 5300Vrms optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division in a 6-DIP package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The MOC8111 provides single-channel isolation suitable for applications requiring high voltage isolation with DC input and transistor output configuration.

Key Parameters

Parameter	MOC8111 Specification
Voltage - Isolation	5300Vrms
Number of Channels	1
Current Transfer Ratio (Min)	20% @ 10mA
Turn On / Turn Off Time (Typ)	3µs, 18µs
Rise / Fall Time (Typ)	2µs, 11µs
Output Type	Transistor
Voltage - Output (Max)	70V
Voltage - Forward (Vf) (Typ)	1.3V
Current - DC Forward (If) (Max)	90 mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 100°C
Package / Case	6-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the MOC8111 is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Isolation: 5300Vrms (exact match required for high-voltage isolation applications)
Package / Case: 6-DIP (0.300", 7.62mm) (mechanical and pin compatibility)
Output Type: Transistor (functional output configuration)
Number of Channels: 1 (single-channel isolation)
Operating Temperature: -55°C ~ 100°C (thermal operating range)

Secondary Compatibility Parameters:

Current Transfer Ratio (Min): 20% or higher @ 10mA
Voltage - Output (Max): 70V or higher
Vce Saturation (Max): 400mV or lower
Current - DC Forward (If) (Max): 60mA or higher

Substitute parts meeting these criteria maintain functional and mechanical compatibility with the MOC8111 in existing circuit designs.

Parameter Comparison

Parameter	MOC8111	CNY17F-3	4N25-000E	IS205	IS205X	IS206	IS206X	MOC8101	MOC8101X	MOC8102	MOC8102X
Manufacturer	Vishay	Lite-On	Broadcom	Isocom	Isocom	Isocom	Isocom	Vishay	Isocom	onsemi	Isocom
Voltage - Isolation	5300Vrms	5000Vrms	2500Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms
Number of Channels	1	1	1	1	1	1	1	1	1	1	1
Current Transfer Ratio (Min)	20% @ 10mA	100% @ 10mA	20% @ 10mA	100% @ 10mA	100% @ 10mA	50% @ 10mA	50% @ 10mA	50% @ 10mA	50% @ 10mA	73% @ 10mA	73% @ 10mA
Output Type	Transistor	Transistor	Transistor with Base	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	70V	70V	30V	30V	30V	30V	30V	30V	30V	30V	30V
Voltage - Forward (Vf) (Typ)	1.3V	1.45V	1.2V	1.2V	1.2V	1.2V	1.2V	1.25V	1.15V	1.15V	1.15V
Current - DC Forward (If) (Max)	90 mA	60 mA	80 mA	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA	100 mA	60 mA
Vce Saturation (Max)	400mV	300mV	500mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV
Operating Temperature	-55°C ~ 100°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	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Package / Case	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 (0.300", 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)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Obsolete	Active

Engineering Selection Recommendations

Tier 1 - Full Compatibility (5300Vrms Isolation, 70V Output):

CNY17F-3 and MOC8101 series parts provide the closest functional match to MOC8111. CNY17F-3 (Lite-On) maintains 5300Vrms isolation capability with higher current transfer ratio (100% @ 10mA) and improved Vce saturation (300mV). MOC8101 (Vishay) offers 5300Vrms isolation with 50% current transfer ratio and active product status. MOC8101X (Isocom) provides equivalent specifications with active status and ROHS3 compliance.

Tier 2 - Reduced Output Voltage (5300Vrms Isolation, 30V Output):

IS205, IS205X, IS206, IS206X, MOC8102, and MOC8102X all provide 5300Vrms isolation but with reduced maximum output voltage (30V versus 70V). These parts are suitable for applications not requiring the full 70V output capability. IS205 and IS205X maintain 100% current transfer ratio. IS206 and IS206X provide 50% current transfer ratio. MOC8102 (onsemi, obsolete) and MOC8102X (Isocom, active) offer 73% current transfer ratio with higher forward current capability.

Tier 3 - Reduced Isolation Voltage (5000Vrms Isolation):

CNY17F-3 provides 5000Vrms isolation, which is acceptable for applications where 5300Vrms isolation is not a strict requirement. This part offers superior current transfer ratio (100% @ 10mA) and improved switching characteristics.

Tier 4 - Not Recommended (2500Vrms Isolation):

4N25-000E (Broadcom) provides only 2500Vrms isolation and is not suitable as a direct substitute for MOC8111 applications requiring 5300Vrms isolation capability.

Product Status Consideration:

For new designs, select from active product status parts: CNY17F-3, IS205, IS205X, IS206, IS206X, MOC8101, MOC8101X, and MOC8102X. These ensure long-term availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can CNY17F-3 replace MOC8111 directly?

A: CNY17F-3 is compatible for most applications. It maintains 5000Vrms isolation (versus 5300Vrms), identical 6-DIP package, and transistor output. The primary difference is reduced isolation voltage. If your application requires exactly 5300Vrms isolation, use IS205, IS205X, IS206, IS206X, MOC8101, MOC8101X, or MOC8102X instead.

Q: What is the difference between IS205 and IS206?

A: Both parts provide 5300Vrms isolation in 6-DIP package with identical electrical characteristics except for current transfer ratio. IS205 specifies 100% @ 10mA, while IS206 specifies 50% @ 10mA. Both are functionally compatible with MOC8111 for applications not requiring 70V output voltage.

Q: Why does 4N25-000E have lower isolation voltage?

A: 4N25-000E is designed for lower isolation voltage applications (2500Vrms) and includes a base lead on the transistor output, making it a different functional class. It is not recommended as a substitute for MOC8111 in high-voltage isolation circuits.

Q: Are all substitute parts ROHS3 compliant?

A: Most substitute parts listed are ROHS3 compliant. MOC8102 (onsemi, obsolete) does not specify RoHS status. For new designs requiring RoHS compliance, select from CNY17F-3, IS205, IS205X, IS206, IS206X, MOC8101, MOC8101X, or MOC8102X.

Q: What is the impact of different current transfer ratios?

A: Current transfer ratio determines the output current relative to input current. MOC8111 specifies 20% minimum, while most substitutes offer 50% or higher. Higher current transfer ratio improves output drive capability and reduces input current requirements. This is generally beneficial and does not prevent substitution.

Q: Can I use MOC8102X instead of MOC8101?

A: Yes. MOC8102X (Isocom) and MOC8101 (Vishay) both provide 5300Vrms isolation with 50-80% current transfer ratio range. MOC8102X is active status with ROHS3 compliance, making it suitable for new designs. The primary difference is manufacturer and slightly different electrical specifications within acceptable ranges.

Q: Is the 6-DIP package identical across all substitutes?

A: Yes. All substitute parts use 6-DIP (0.300", 7.62mm) package with through-hole mounting, ensuring mechanical and pin compatibility with MOC8111 in existing PCB layouts.

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