MOC8105 Equivalent & Substitute Parts

Part Overview

The MOC8105 is a transistor output optoisolator manufactured by Vishay Semiconductor Opto Division, rated for 5300Vrms isolation voltage in a 6-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MOC8105 provides single-channel isolation with DC input and transistor output configuration, suitable for applications requiring high-voltage galvanic isolation with moderate current switching capability.

Key Parameters

Parameter	Value
Manufacturer Part Number	MOC8105
Manufacturer	Vishay Semiconductor Opto Division
Product Status	Obsolete
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	65% @ 10mA
Current Transfer Ratio (Max)	133% @ 10mA
Output Type	Transistor
Voltage - Output (Max)	30V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 100°C
Package / Case	6-DIP (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the MOC8105 is determined by the following critical parameters:

Isolation Voltage: The MOC8105 operates at 5300Vrms isolation. Substitute parts must maintain this isolation rating or higher to preserve circuit safety margins.

Output Configuration: The MOC8105 features transistor output without base lead access. Substitute parts must match this output type to ensure pin compatibility and circuit functionality.

Package Type: All substitutes must use 6-DIP (0.300", 7.62mm) through-hole packaging for mechanical and electrical compatibility.

Current Transfer Ratio Range: The MOC8105 specifies 65% to 133% CTR @ 10mA. Substitute parts must fall within or overlap this range to maintain consistent switching behavior.

Maximum Output Current: The MOC8105 supports 50mA output current per channel. Substitute parts with equal or higher current ratings are acceptable.

Vce Saturation: The MOC8105 specifies 400mV maximum saturation voltage. Substitute parts with equal or lower saturation voltage maintain or improve performance.

Substitute parts are grouped into two categories:

Direct Equivalents (5300Vrms Isolation): IS205, IS205X, IS206, IS206X, MOC8101X, MOC8102X, and MOC8105 (Fairchild variant) maintain the same isolation voltage and output configuration.

Alternative with Higher Output Capability (5000Vrms Isolation): CNY17-2-000E provides transistor output with base lead access and higher maximum output current (150mA), with slightly lower isolation voltage (5000Vrms).

Parameter Comparison

Parameter	MOC8105 (Vishay)	IS205	IS205X	IS206	IS206X	MOC8101X	MOC8102X	CNY17-2-000E
Manufacturer	Vishay	Isocom	Isocom	Isocom	Isocom	Isocom	Isocom	Broadcom
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
Voltage - Isolation	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5300Vrms	5000Vrms
Number of Channels	1	1	1	1	1	1	1	1
Current Transfer Ratio (Min)	65% @ 10mA	100% @ 10mA	100% @ 10mA	50% @ 10mA	50% @ 10mA	50% @ 10mA	73% @ 10mA	63% @ 10mA
Current Transfer Ratio (Max)	133% @ 10mA	—	—	—	—	80% @ 10mA	117% @ 10mA	125% @ 10mA
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor with Base
Voltage - Output (Max)	30V	30V	30V	30V	30V	30V	30V	70V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA	50mA	150mA
Vce Saturation (Max)	400mV	400mV	400mV	400mV	400mV	400mV	400mV	300mV
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
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)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Identical Isolation Voltage - 5300Vrms):

IS205 and IS205X are direct functional equivalents with 5300Vrms isolation, transistor output, and 6-DIP packaging. Both are active products with ROHS3 compliance. IS205X offers identical specifications to IS205 with confirmed active status and current inventory availability.

MOC8102X provides 5300Vrms isolation with CTR range of 73% to 117% @ 10mA, overlapping the MOC8105 specification. This part is active and ROHS3 compliant.

MOC8101X operates at 5300Vrms with CTR range of 50% to 80% @ 10mA, providing lower CTR tolerance but maintaining isolation and output specifications.

IS206 and IS206X are functionally equivalent at 5300Vrms isolation with CTR minimum of 50% @ 10mA, suitable for applications with lower CTR requirements.

Alternative Substitute (5000Vrms Isolation):

CNY17-2-000E from Broadcom provides 5000Vrms isolation with transistor output including base lead access. This part offers higher maximum output current (150mA) and higher maximum output voltage (70V), with lower Vce saturation (300mV). The isolation voltage is 300Vrms lower than the MOC8105, requiring circuit-level evaluation for applications with strict isolation requirements.

Compliance and Availability:

All substitute parts are ROHS3 compliant with MSL rating of 1 (Unlimited). Active product status ensures ongoing availability and manufacturing support compared to the obsolete MOC8105.

Frequently Asked Questions (FAQ)

Q: Can IS205 or IS205X directly replace MOC8105 in existing designs?

A: Yes. IS205 and IS205X maintain identical isolation voltage (5300Vrms), output type (transistor), package (6-DIP), and operating temperature range. Pin configuration and electrical characteristics are compatible for direct substitution.

Q: What is the difference between IS205 and IS205X?

A: Both parts are functionally identical with 5300Vrms isolation and transistor output. IS205X is the extended temperature or performance-qualified variant. Both are active products with current inventory.

Q: Why does MOC8102X have a different CTR range than MOC8105?

A: MOC8102X specifies 73% to 117% CTR @ 10mA, while MOC8105 specifies 65% to 133% @ 10mA. MOC8102X provides a narrower tolerance band. Both ranges overlap, making MOC8102X suitable for applications within the 73% to 117% window.

Q: Can CNY17-2-000E replace MOC8105 if isolation voltage is critical?

A: CNY17-2-000E operates at 5000Vrms isolation, which is 300Vrms lower than MOC8105. Direct substitution requires circuit-level analysis to confirm that 5000Vrms isolation meets application safety and regulatory requirements. The part offers higher output current (150mA vs 50mA) and higher output voltage (70V vs 30V) as compensating advantages.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (IS205, IS205X, IS206, IS206X, MOC8101X, MOC8102X, and CNY17-2-000E) are ROHS3 compliant with MSL rating of 1 (Unlimited).

Q: What is the significance of transistor output with base versus without base?

A: MOC8105 and most substitutes feature transistor output without base lead access. CNY17-2-000E includes base lead access, providing additional circuit design flexibility for applications requiring base current control. Pin configuration differs; circuit board layout must accommodate the different pinout.

Q: Which substitute offers the best CTR match to MOC8105?

A: MOC8102X (73% to 117% @ 10mA) and CNY17-2-000E (63% to 125% @ 10mA) provide CTR ranges that closely overlap the MOC8105 specification (65% to 133% @ 10mA). IS205 and IS205X specify minimum 100% CTR, which falls within the MOC8105 range.

Q: Are all substitutes available in the same 6-DIP package?

A: Yes. All substitute parts use 6-DIP (0.300", 7.62mm) through-hole packaging, ensuring mechanical compatibility with existing PCB designs.

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