MOC8104S Equivalent & Substitute Parts

Part Overview

The MOC8104S is an optoisolator with transistor output manufactured by onsemi, featuring 5300Vrms isolation voltage and single-channel configuration in 6-SMD surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The MOC8104S serves applications requiring galvanic isolation with transistor-based output switching in industrial and power management circuits.

Substiute Parts

MOC8104S

onsemiIn Stock: 696MOC8104S Datasheet

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CNY17F4SM

Fairchild SemiconductorIn Stock: 2269CNY17F4SM Datasheet

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MOC8104-X019T

Vishay Semiconductor Opto DivisionIn Stock: 3877MOC8104-X019T Datasheet

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MOC8104SM

Isocom Components 2004 LTDIn Stock: 1153MOC8104SM Datasheet

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MOC8104SMT&R

Isocom Components 2004 LTDIn Stock: 871MOC8104SMT&R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MOC8104S is determined by the following critical parameters: single-channel configuration, transistor output type, 6-SMD surface mount package with gull wing leads, and electrical compatibility within specified isolation voltage, current transfer ratio, and output voltage ratings.

The substitute parts are grouped into two categories based on isolation voltage specification:

Category 1: Full Electrical Equivalence (5300Vrms Isolation) Parts meeting or exceeding the 5300Vrms isolation voltage specification with matching transistor output characteristics and package configuration.

Category 2: Reduced Isolation Voltage (Below 5300Vrms) Parts with lower isolation voltage ratings but compatible output stage parameters and package form factor, suitable for applications not requiring the full 5300Vrms isolation specification.

Parameter Comparison

Engineering Selection Recommendations

MOC8104-X019T (Vishay Semiconductor Opto Division) is the primary direct substitute. It maintains identical isolation voltage (5300Vrms), current transfer ratio range (160–256% @ 10mA), output voltage (30V maximum), and operating temperature range (-55°C to 100°C). This part is active in production status and ROHS3 compliant. Available in Tape & Reel packaging for automated assembly.

CNY17F4SM (Fairchild Semiconductor) is suitable for applications where 4170Vrms isolation voltage is acceptable. It provides equivalent current transfer ratio performance (160–320% @ 10mA) and identical output current (50mA). The higher maximum output voltage (70V) offers additional design margin. Operating temperature range is -40°C to 100°C, which is narrower than the MOC8104S. Available in bulk packaging.

MOC8104SM and MOC8104SMT&R (Isocom Components 2004 LTD) share the MOC8104 base product number and maintain identical output stage specifications (30V maximum, 50mA output current, 400mV saturation). However, isolation voltage is specified as 7.5Vpk, which is substantially lower than the MOC8104S 5300Vrms rating. These parts are suitable only for applications with reduced isolation requirements. Both are ROHS3 compliant and active in production. MOC8104SM is available in tube packaging; MOC8104SMT&R is available in Tape & Reel.

Frequently Asked Questions (FAQ)

Q: Can MOC8104-X019T directly replace MOC8104S in existing designs? A: Yes. MOC8104-X019T maintains all critical electrical parameters: 5300Vrms isolation voltage, 160–256% current transfer ratio, 30V maximum output voltage, 50mA output current, and -55°C to 100°C operating temperature. Pin configuration and 6-SMD package are identical. No circuit modifications are required.

Q: What is the key difference between MOC8104-X019T and CNY17F4SM? A: The primary difference is isolation voltage. MOC8104-X019T provides 5300Vrms isolation matching the original MOC8104S specification. CNY17F4SM provides 4170Vrms isolation, which is approximately 79% of the original specification. CNY17F4SM also offers higher maximum output voltage (70V vs. 30V) and slightly broader current transfer ratio range (160–320% vs. 160–256%). Operating temperature range for CNY17F4SM is -40°C to 100°C, which does not extend to -55°C.

Q: Why do MOC8104SM and MOC8104SMT&R show 7.5Vpk isolation voltage? A: The isolation voltage specification for these Isocom parts (7.5Vpk) differs fundamentally from the MOC8104S (5300Vrms). These parts are not suitable for applications requiring the full 5300Vrms isolation specification. They are listed as substitutes only for applications with significantly reduced isolation voltage requirements.

Q: Are all substitute parts available in the same packaging options? A: No. MOC8104-X019T is available in Tape & Reel (TR). CNY17F4SM is available in bulk packaging. MOC8104SM is available in tube packaging. MOC8104SMT&R is available in Tape & Reel. Select the packaging option that matches your assembly process requirements.

Q: Which substitute part is recommended for new designs? A: MOC8104-X019T (Vishay) is the recommended substitute for new designs. It is active in production status, ROHS3 compliant, maintains full electrical equivalence to MOC8104S, and is available in standard Tape & Reel packaging for automated assembly processes.

Q: What compliance certifications apply to these substitute parts? A: MOC8104-X019T, MOC8104SM, and MOC8104SMT&R are ROHS3 compliant. All parts listed carry REACH Unaffected status and EAR99 ECCN classification. HTSUS code 8541.49.8000 applies to all optoisolator components in this comparison.