MOC8050S Optoisolator Equivalent & Substitute Parts

Part Overview

The MOC8050S is a high-voltage isolation optoisolator with Darlington output manufactured by onsemi. This component provides 5300Vrms isolation rating in a 6-SMD surface mount package, designed for applications requiring galvanic isolation with high current transfer capability. The MOC8050S is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain compatibility across isolation voltage, output current capacity, and thermal operating range while accommodating packaging and availability constraints.

Substiute Parts

MOC8050S

onsemiIn Stock: 2017MOC8050S Datasheet

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MOC8050SR2M

onsemiIn Stock: 12429MOC8050SR2M Datasheet

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4N32FSM

Isocom Components 2004 LTDIn Stock: 9254N32FSM Datasheet

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MOC8050SM

Isocom Components 2004 LTDIn Stock: 753MOC8050SM Datasheet

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MOC8050SMT&R

Isocom Components 2004 LTDIn Stock: 1133MOC8050SMT&R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MOC8050S is determined by the following critical parameters:

• Isolation Voltage: Minimum 5000Vrms required to maintain equivalent isolation performance
• Output Current Capacity: Minimum 80mA required; 150mA preferred for full compatibility
• Output Type: Darlington configuration mandatory
• Package Configuration: 6-SMD, Gull Wing surface mount required for PCB compatibility
• Number of Channels: Single channel (1) required
• Input Type: DC input required
• Operating Temperature: Must support at least -40°C to 100°C range

Substitute parts are grouped into two categories based on output current capacity: full-capacity substitutes (150mA) and reduced-capacity substitutes (80mA). Full-capacity substitutes provide direct functional replacement. Reduced-capacity substitutes are suitable only for applications with output current requirements not exceeding 80mA.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: MOC8050SR2M (onsemi)

MOC8050SR2M is the preferred substitute for new designs. Manufactured by onsemi (original MOC8050S manufacturer), it maintains the same base product number (MOC8050) and provides full electrical compatibility with 150mA output current capacity. The isolation voltage is reduced to 4170Vrms, which is acceptable for applications not requiring the full 5300Vrms specification. Product status is active with ROHS3 compliance and unlimited moisture sensitivity level. Available in Cut Tape and Digi-Reel packaging with 12,400 units in stock.

Secondary Substitutes: MOC8050SM and MOC8050SMT&R (Isocom Components 2004 LTD)

Both parts provide 5000Vrms isolation voltage and are manufactured by Isocom Components 2004 LTD. MOC8050SM is supplied in Tube packaging (722 units in stock), while MOC8050SMT&R is supplied in Tape & Reel format (1,028 units in stock). Both are ROHS3 compliant and active products. Output current is limited to 80mA, suitable only for applications with reduced current requirements. Operating temperature range extends to 110°C maximum, providing enhanced thermal performance compared to MOC8050S.

Tertiary Substitute: 4N32FSM (Isocom Components 2004 LTD)

4N32FSM maintains the full 5300Vrms isolation voltage specification and is part of the 4N33F series. This part is suitable for applications requiring maximum isolation voltage. Output current is limited to 80mA. Operating temperature range is -25°C to 100°C, which may not accommodate extended low-temperature operation. Available in Tube packaging with 886 units in stock. ROHS3 compliant.

Selection Criteria Summary:

• For applications requiring 150mA output current: Select MOC8050SR2M
• For applications requiring 5000Vrms or higher isolation with 80mA output: Select MOC8050SM or MOC8050SMT&R based on packaging preference
• For applications requiring 5300Vrms isolation with 80mA output and standard temperature range: Select 4N32FSM
• All substitutes maintain 6-SMD Gull Wing surface mount package compatibility
• All substitutes are active products with current manufacturing support

Frequently Asked Questions (FAQ)

Q: Can MOC8050SR2M replace MOC8050S directly in existing designs?

A: MOC8050SR2M is electrically compatible for most applications. The primary difference is reduced isolation voltage (4170Vrms vs. 5300Vrms). If your application requires the full 5300Vrms isolation specification, use 4N32FSM or MOC8050SM instead. All three maintain identical 6-SMD Gull Wing package footprints and pinouts.

Q: What is the difference between MOC8050SM and MOC8050SMT&R?

A: Both parts are electrically identical. The difference is packaging format: MOC8050SM is supplied in Tube packaging, while MOC8050SMT&R is supplied in Tape & Reel format. Select based on your procurement and assembly process requirements.

Q: Why do some substitutes have 80mA output current instead of 150mA?

A: Output current capacity is a fundamental design parameter. Parts with 80mA output are suitable only for applications where output current does not exceed 80mA. If your application requires 150mA output current, select MOC8050SR2M, which maintains the full 150mA capacity.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. MOC8050SR2M, 4N32FSM, MOC8050SM, and MOC8050SMT&R are all ROHS3 compliant. The original MOC8050S compliance status was not specified in available documentation.

Q: What is the operating temperature difference between substitutes?

A: MOC8050S operates -55°C to 100°C. MOC8050SR2M operates -40°C to 100°C (narrower low-temperature range). MOC8050SM and MOC8050SMT&R operate -55°C to 110°C (extended high-temperature range). 4N32FSM operates -25°C to 100°C (most restricted range). Select based on your thermal environment requirements.

Q: Can I use 4N32FSM in applications previously using MOC8050S?

A: 4N32FSM is compatible if your application operates within -25°C to 100°C temperature range and output current does not exceed 80mA. The 5300Vrms isolation voltage matches the original specification. Verify that the narrower low-temperature limit does not conflict with your operating environment.

Q: What is the moisture sensitivity level for all parts?

A: All substitute parts have Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without moisture control requirements. This matches the original MOC8050S specification.