MOC8104 Optoisolator Equivalent & Substitute Parts

Part Overview

The MOC8104 is an optoisolator with transistor output manufactured by Vishay Semiconductor Opto Division. This 6-DIP package device provides 5300Vrms isolation with a single channel and DC input type. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity level rating. Equivalent and substitute parts are identified based on matching isolation voltage, package configuration, output type, and electrical performance parameters within acceptable tolerances for optoisolator applications.

Key Parameters

Parameter	MOC8104 Value
Manufacturer	Vishay Semiconductor Opto Division
Package / Case	6-DIP (0.300", 7.62mm)
Number of Channels	1
Voltage - Isolation	5300Vrms
Output Type	Transistor
Current Transfer Ratio (Min)	160% @ 10mA
Current Transfer Ratio (Max)	256% @ 10mA
Voltage - Output (Max)	30V
Current - Output / Channel	50mA
Vce Saturation (Max)	400mV
Operating Temperature	-55°C ~ 100°C
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the MOC8104 are categorized based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Package configuration: 6-DIP (0.300", 7.62mm) through-hole mounting
Isolation voltage: 5300Vrms or higher
Output type: Transistor output
Number of channels: Single channel
Input type: DC
Operating temperature range: -55°C ~ 100°C minimum

Secondary Compatibility Parameters:

Current Transfer Ratio minimum of 50% @ 10mA or higher
Maximum output voltage of 30V or higher
Output current capability of 50mA or higher
Vce saturation maximum of 400mV or lower

Parts meeting all primary criteria and maintaining secondary parameter compatibility are classified as direct substitutes. Parts with isolation voltage below 5300Vrms or different output configurations are excluded from substitution consideration.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min @ 10mA	CTR Max @ 10mA	Output Voltage (Max)	Output Current	Vce Sat (Max)	Rise/Fall Time	Inventory
MOC8104	Vishay Semiconductor Opto Division	5300Vrms	160%	256%	30V	50mA	400mV	2µs, 2µs	4993 Pcs
MOC8104-X016	Vishay Semiconductor Opto Division	5300Vrms	160%	256%	30V	50mA	400mV	2µs, 2µs	2850 Pcs
CNY17-4-000E	Broadcom Limited	5000Vrms	160%	320%	70V	150mA	300mV	5µs, 5µs	12550 Pcs
IS205X	Isocom Components 2004 LTD	5300Vrms	100%	—	30V	50mA	400mV	2µs, 2µs	1014 Pcs
IS206X	Isocom Components 2004 LTD	5300Vrms	50%	—	30V	50mA	400mV	2µs, 2µs	1071 Pcs
MOC8101X	Isocom Components 2004 LTD	5300Vrms	50%	80%	30V	50mA	400mV	2µs, 2µs	1777 Pcs

Engineering Selection Recommendations

Direct Parametric Equivalent: MOC8104-X016 from Vishay Semiconductor Opto Division provides identical electrical specifications and package configuration. This part maintains the same isolation voltage (5300Vrms), current transfer ratio range (160-256%), and output characteristics. Both parts carry ROHS3 compliance and unlimited moisture sensitivity rating. Selection of MOC8104-X016 requires no circuit redesign.

Manufacturer-Recommended Substitute: CNY17-4-000E from Broadcom Limited meets primary substitution criteria with 5000Vrms isolation and transistor output in 6-DIP package. This part exceeds MOC8104 specifications in output voltage (70V vs 30V), output current (150mA vs 50mA), and current transfer ratio maximum (320% vs 256%). Vce saturation is superior at 300mV. Rise and fall times are longer at 5µs. ROHS3 compliance and unlimited MSL rating are maintained. Circuit compatibility must be confirmed for applications sensitive to isolation voltage differential or switching speed.

Alternative Substitutes: IS205X and IS206X from Isocom Components 2004 LTD provide 5300Vrms isolation matching the MOC8104. IS205X maintains 100% minimum current transfer ratio. IS206X operates at 50% minimum CTR. Both parts match package, output type, voltage, and current specifications. MOC8101X from Isocom also provides 5300Vrms isolation with 50-80% CTR range and identical output characteristics. All three Isocom parts carry ROHS3 compliance and unlimited MSL rating.

All substitute parts listed maintain active product status and ROHS3 compliance. Selection should be based on current transfer ratio requirements, isolation voltage margin needs, and switching speed specifications for the target application.

Frequently Asked Questions (FAQ)

Q: Can MOC8104-X016 be used as a direct replacement for MOC8104? A: Yes. MOC8104-X016 is a parametric equivalent with identical isolation voltage (5300Vrms), current transfer ratio (160-256%), output voltage (30V), output current (50mA), and package configuration (6-DIP). No circuit modifications are required.

Q: What is the key difference between MOC8104 and CNY17-4-000E? A: CNY17-4-000E has lower isolation voltage (5000Vrms vs 5300Vrms) but higher output voltage capability (70V vs 30V) and output current (150mA vs 50mA). Rise and fall times are slower (5µs vs 2µs). Applications requiring 5300Vrms isolation should not use CNY17-4-000E.

Q: Are IS205X and IS206X suitable substitutes? A: Both parts meet package and isolation voltage requirements (5300Vrms, 6-DIP). IS205X has 100% minimum CTR; IS206X has 50% minimum CTR. Both match output voltage (30V) and current (50mA) specifications. Selection depends on whether the application can tolerate lower current transfer ratios.

Q: What does Current Transfer Ratio (CTR) represent? A: CTR is the ratio of output collector current to input LED current, expressed as a percentage. Higher CTR indicates more efficient signal transfer. MOC8104 specifies 160-256% CTR at 10mA input current, meaning output current ranges from 16mA to 25.6mA for 10mA input.

Q: Can parts with different isolation voltages be interchanged? A: No. Isolation voltage is a critical safety parameter. MOC8104 at 5300Vrms provides higher isolation margin than CNY17-4-000E at 5000Vrms. Substitution with lower isolation voltage is not recommended for applications requiring 5300Vrms isolation.

Q: Are all listed parts ROHS3 compliant? A: Yes. MOC8104, MOC8104-X016, CNY17-4-000E, IS205X, IS206X, and MOC8101X all carry ROHS3 compliance status. All parts have unlimited moisture sensitivity level (MSL 1) rating.

Q: What is the significance of the 6-DIP package specification? A: The 6-DIP (0.300", 7.62mm) package defines the physical footprint and pin configuration. All listed substitutes use identical 6-DIP through-hole mounting, ensuring direct PCB compatibility without layout modifications.

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