MOC8104300 Optoisolator Equivalent & Substitute Parts

Part Overview

The MOC8104300 is a transistor output optoisolator manufactured by onsemi, rated for 5300Vrms isolation voltage in a 6-DIP through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The part delivers 1-channel isolation with 160-256% current transfer ratio at 10mA input, suitable for applications requiring high-voltage galvanic isolation with DC input and transistor output configuration.

Key Parameters

Parameter	Value
Manufacturer Part Number	MOC8104300
Manufacturer	onsemi
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5300Vrms
Current Transfer Ratio (Min)	160% @ 10mA
Current Transfer Ratio (Max)	256% @ 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)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the MOC8104300 is determined by the following critical parameters:

Isolation Voltage: The 5300Vrms isolation rating is the primary electrical requirement. Substitute parts must maintain this isolation specification or higher to preserve circuit safety margins.

Package Configuration: The 6-DIP through-hole package (0.300", 7.62mm) is mandatory for mechanical compatibility with existing PCB layouts and socket designs.

Output Characteristics: Transistor output type, maximum output voltage of 30V, and 50mA per-channel current capacity define the load-driving capability.

Current Transfer Ratio: The 160-256% CTR range at 10mA input establishes the optical coupling efficiency required for reliable signal transmission.

Operating Temperature Range: The -55°C to 100°C specification defines the thermal operating envelope.

Substitute parts are grouped into two categories: direct equivalents maintaining identical isolation voltage and performance characteristics, and functional alternatives with modified electrical parameters that remain compatible within system design constraints.

Parameter Comparison

Parameter	MOC8104300 (onsemi)	MOC8104 (Fairchild)	CNY17F4VM (onsemi)
Voltage - Isolation	5300Vrms	5300Vrms	4170Vrms
Number of Channels	1	1	1
Current Transfer Ratio (Min)	160% @ 10mA	160% @ 10mA	160% @ 10mA
Current Transfer Ratio (Max)	256% @ 10mA	256% @ 10mA	320% @ 10mA
Output Type	Transistor	Transistor	Transistor
Voltage - Output (Max)	30V	30V	70V
Current - Output / Channel	50mA	50mA	50mA
Vce Saturation (Max)	400mV	400mV	400mV
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-40°C ~ 100°C
Package / Case	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
Product Status	Obsolete	Obsolete	Active

Engineering Selection Recommendations

MOC8104 (Fairchild Semiconductor): This part is a direct electrical equivalent to the MOC8104300, maintaining identical isolation voltage (5300Vrms), current transfer ratio range (160-256%), output voltage maximum (30V), and operating temperature range (-55°C to 100°C). The part is obsolete but carries ROHS3 compliance certification. Selection of this substitute is appropriate for applications where the original onsemi part is unavailable and the Fairchild variant can be sourced.

CNY17F4VM (onsemi): This part offers reduced isolation voltage (4170Vrms versus 5300Vrms) but maintains the same package, output current capacity (50mA), and saturation voltage (400mV). The CNY17F4VM provides higher maximum output voltage (70V) and superior current transfer ratio maximum (320% versus 256%). This part is active and ROHS3 compliant. Selection is appropriate for applications where the lower isolation voltage is acceptable and the enhanced output voltage capability provides design flexibility. The operating temperature minimum is -40°C, which may limit use in extreme cold environments compared to the -55°C specification of the original part.

Frequently Asked Questions (FAQ)

Q: Can MOC8104 (Fairchild) be used as a direct replacement for MOC8104300?

A: Yes. Both parts share identical isolation voltage (5300Vrms), current transfer ratio specifications (160-256% @ 10mA), output voltage maximum (30V), output current (50mA), and operating temperature range (-55°C to 100°C). The 6-DIP package is mechanically identical. Electrical performance is equivalent.

Q: What is the key difference between MOC8104300 and CNY17F4VM?

A: The primary difference is isolation voltage: MOC8104300 provides 5300Vrms while CNY17F4VM provides 4170Vrms. The CNY17F4VM compensates with higher maximum output voltage (70V versus 30V) and higher maximum current transfer ratio (320% versus 256%). Operating temperature minimum differs: -55°C for MOC8104300 versus -40°C for CNY17F4VM.

Q: Is CNY17F4VM suitable for applications requiring 5300Vrms isolation?

A: No. If the application circuit design specifies 5300Vrms isolation as a safety or regulatory requirement, the CNY17F4VM with 4170Vrms isolation does not meet this specification. Use MOC8104 (Fairchild) or source the original MOC8104300 instead.

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

A: Yes. MOC8104 (Fairchild) and CNY17F4VM are both supplied in 6-DIP (0.300", 7.62mm) through-hole packages, identical to the MOC8104300. Direct PCB socket compatibility is maintained.

Q: What compliance certifications apply to these substitute parts?

A: MOC8104 (Fairchild) carries ROHS3 compliance. CNY17F4VM carries ROHS3 compliance. Both parts are REACH unaffected. Verify compliance requirements for your specific application before selection.

Q: Can CNY17F4VM operate at -55°C?

A: No. CNY17F4VM is rated for -40°C to 100°C operating temperature. If your application requires operation at -55°C, use MOC8104 (Fairchild) or the original MOC8104300, both rated to -55°C.

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