MOC8050SD Equivalent & Substitute Parts

Part Overview

The MOC8050SD is a 5300Vrms isolation optoisolator with Darlington output configuration, manufactured by onsemi in a 6-SMD surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The MOC8050SD provides single-channel isolation suitable for applications requiring high voltage isolation with Darlington output switching capability.

Substiute Parts

MOC8050SD

onsemiIn Stock: 722MOC8050SD 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 for the MOC8050SD is determined by the following critical parameters:

• Isolation Voltage: Minimum 5000Vrms (MOC8050SD specifies 5300Vrms)
• Output Type: Darlington configuration required
• Number of Channels: Single channel
• Package / Case: 6-SMD, Gull Wing surface mount
• Current - Output / Channel: Minimum 80mA (MOC8050SD provides 150mA)
• Operating Temperature Range: Must encompass or exceed -55°C to 100°C
• Input Type: DC
• Voltage - Output (Max): 80V

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

Category A - Full Isolation Voltage Match (5000Vrms and above):

• MOC8050SMT&R (5000Vrms)
• MOC8050SM (5000Vrms)
• 4N32FSM (5300Vrms)

Category B - Reduced Isolation Voltage (4170Vrms):

• MOC8050SR2M (4170Vrms) - suitable only where lower isolation voltage is acceptable

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

MOC8050SMT&R and MOC8050SM are the preferred substitutes. Both are active products with ROHS3 compliance and maintain 5000Vrms isolation voltage, which meets the isolation requirement for applications designed around the MOC8050SD. These parts provide identical package configuration and output voltage specifications. The MOC8050SMT&R is supplied in Tape & Reel format, while MOC8050SM is supplied in Tube format.

Alternative Substitute (Full Isolation Voltage Match):

4N32FSM maintains the full 5300Vrms isolation voltage specification of the original MOC8050SD and is an active product with ROHS3 compliance. This part is suitable where the original isolation voltage specification is a critical design requirement. Note that output current is reduced to 80mA compared to the MOC8050SD's 150mA rating.

Conditional Substitute (Reduced Isolation Voltage):

MOC8050SR2M is an active product with ROHS3 compliance but specifies 4170Vrms isolation voltage, which is lower than the MOC8050SD. This part is suitable only for applications where the reduced isolation voltage is acceptable within the design margin.

Compliance Considerations:

All substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The MOC8050SD lacks specified RoHS status due to its obsolete classification.

Frequently Asked Questions (FAQ)

Q: Can MOC8050SR2M be used as a direct replacement for MOC8050SD?

A: MOC8050SR2M is mechanically and functionally compatible but specifies 4170Vrms isolation voltage compared to MOC8050SD's 5300Vrms. It is suitable only if your application design margin accommodates the lower isolation voltage specification.

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

A: Both parts are electrically identical with 5000Vrms isolation voltage and identical electrical performance. The difference is packaging format: MOC8050SMT&R is supplied in Tape & Reel format for automated assembly, while MOC8050SM is supplied in Tube format for manual handling.

Q: Does the reduced output current of 4N32FSM (80mA vs. 150mA) affect compatibility?

A: The 4N32FSM output current rating of 80mA is lower than the MOC8050SD's 150mA. Compatibility depends on your circuit's actual current requirements. If your design draws less than 80mA, the 4N32FSM is suitable. If your design requires the full 150mA capability, use MOC8050SMT&R or MOC8050SM instead.

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

A: Yes, all substitute parts use the 6-SMD, Gull Wing surface mount package, ensuring PCB layout compatibility with the original MOC8050SD design.

Q: What is the operating temperature difference between MOC8050SD and the substitutes?

A: MOC8050SD operates from -55°C to 100°C. MOC8050SMT&R and MOC8050SM extend the upper limit to 110°C. MOC8050SR2M operates from -40°C to 100°C, and 4N32FSM operates from -25°C to 100°C. Verify that the substitute's temperature range meets your application requirements.

Q: Are all substitutes RoHS compliant?

A: Yes, all substitute parts are ROHS3 compliant. The original MOC8050SD does not specify RoHS status due to its obsolete classification.