4N33SM Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N33SM is an optoisolator with Darlington output manufactured by onsemi, designed for high-voltage isolation applications. This component features a 4170Vrms isolation rating and single-channel configuration in a 6-SMD surface mount package. The part is currently active in production with full ROHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified to support design flexibility, inventory management, and supply chain continuity for applications requiring compatible optoisolation functionality.

Substiute Parts

4N33SM

onsemiIn Stock: 14404N33SM Datasheet

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4N33SM

onsemiIn Stock: 14404N33SM Datasheet

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4N33SMT&R

Isocom Components 2004 LTDIn Stock: 20324N33SMT&R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 4N33SM are identified based on the following critical parameters that determine functional compatibility:

• Output Configuration: Darlington with Base output type
• Package Type: 6-SMD, Gull Wing surface mount package
• Number of Channels: Single channel
• Input Type: DC
• Voltage - Output (Max): 30V maximum
• Vce Saturation (Max): 1V maximum
• Turn On / Turn Off Time: 5µs on, 100µs maximum off
• Mounting Type: Surface Mount

The 4N33SM and 4N33SMT&R share identical package geometry, output configuration, and core electrical characteristics. Both components are manufactured to the same base product specification (4N33 series) and maintain compatibility across the critical parameters listed above. The primary differences relate to isolation voltage rating and current output capacity, which are application-dependent considerations rather than substitution barriers.

Parameter Comparison

Engineering Selection Recommendations

Both the 4N33SM and 4N33SMT&R are active production components with ROHS3 compliance and unlimited moisture sensitivity rating. Selection between these parts is determined by application-specific isolation voltage and output current requirements:

• 4N33SM (onsemi): Select for applications requiring 4170Vrms isolation voltage and 150mA output current per channel. Suitable for high-voltage isolation scenarios.

• 4N33SMT&R (Isocom Components 2004 LTD): Select for applications with lower isolation voltage requirements (7.5Vpk) and reduced output current capacity (50mA). Offers extended operating temperature range (-55°C to 100°C) compared to the 4N33SM (-40°C to 100°C).

Both parts maintain identical package geometry, output configuration, and core switching characteristics. Substitution is valid when application isolation voltage and output current specifications align with the selected part's rated parameters.

Frequently Asked Questions (FAQ)

Q: Can the 4N33SMT&R replace the 4N33SM in all applications?

A: Substitution is valid only when the application isolation voltage requirement does not exceed 7.5Vpk and the output current requirement does not exceed 50mA. The 4N33SM provides higher isolation voltage (4170Vrms) and output current (150mA) capacity. If your application requires these higher ratings, the 4N33SM is the appropriate selection.

Q: Are the package dimensions identical between 4N33SM and 4N33SMT&R?

A: Yes. Both parts use the 6-SMD, Gull Wing surface mount package with identical footprint and pin configuration. PCB layout and assembly processes are compatible between the two parts.

Q: What is the difference between Tube and Tape & Reel packaging?

A: The 4N33SM is supplied in Tube packaging, while the 4N33SMT&R is supplied in Tape & Reel (TR) format. Both are surface mount packages suitable for automated assembly. Tape & Reel packaging is optimized for high-volume production runs, while Tube packaging is suitable for lower-volume applications and manual handling.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the 4N33SM and 4N33SMT&R are ROHS3 compliant, REACH unaffected, and carry unlimited moisture sensitivity rating (MSL 1). Both are classified under ECCN EAR99 and HTSUS 8541.49.8000.

Q: What is the operating temperature difference between these parts?

A: The 4N33SM operates from -40°C to 100°C, while the 4N33SMT&R operates from -55°C to 100°C. The 4N33SMT&R provides a 15°C lower temperature minimum, suitable for applications requiring extended low-temperature performance.