4N32S Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N32S is an optoisolator with Darlington output and base connection, manufactured by onsemi. This component provides 5300Vrms isolation voltage in a 6-SMD surface mount package. The 4N32S is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across isolation voltage, output configuration, channel count, and thermal operating range.

Substiute Parts

4N32S

onsemiIn Stock: 36644N32S Datasheet

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4N32SM

onsemiIn Stock: 22754N32SM Datasheet

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4N33SR2M

onsemiIn Stock: 31544N33SR2M Datasheet

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4N32SM

onsemiIn Stock: 22754N32SM Datasheet

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4N32SMT&R

Isocom Components 2004 LTDIn Stock: 8844N32SMT&R Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 4N32S is determined by the following critical parameters:

• Number of Channels: Must be 1 channel
• Output Type: Must be Darlington with Base configuration
• Voltage - Isolation: Minimum 5300Vrms required for direct substitution
• Current - Output / Channel: Minimum 150mA required
• Voltage - Output (Max): Must support 30V
• Operating Temperature Range: Must encompass -55°C to 100°C or be compatible with application requirements
• Mounting Type: Surface Mount preferred for form factor compatibility
• Package / Case: 6-SMD, Gull Wing preferred for PCB layout compatibility

Based on these criteria, the following parts are identified as substitutes:

• 4N32SM (onsemi): Active status, 4170Vrms isolation, 6-SMD surface mount, reduced temperature range (-40°C ~ 100°C)
• 4N33SR2M (onsemi): Active status, 4170Vrms isolation, 6-SMD surface mount, reduced temperature range (-40°C ~ 100°C)
• 4N32SMT&R (Isocom Components 2004 LTD): Active status, different isolation specification (7.5Vpk), through-hole package, reduced output current (50mA)

Parameter Comparison

Engineering Selection Recommendations

4N32SM and 4N33SR2M (onsemi): These parts are direct functional equivalents with active product status and ROHS3 compliance. Both maintain the 6-SMD surface mount package and Darlington output configuration. The isolation voltage is reduced to 4170Vrms, and the operating temperature range is limited to -40°C ~ 100°C. Selection between these two depends on packaging requirements: 4N32SM is supplied in Tube packaging, while 4N33SR2M is supplied in Tape & Reel (TR) format for automated assembly.

4N32SMT&R (Isocom Components 2004 LTD): This part maintains the full operating temperature range (-55°C ~ 100°C) and active product status with ROHS3 compliance. However, it uses a through-hole 6-DIP package instead of surface mount, and the output current is limited to 50mA versus the 150mA of the 4N32S. The isolation voltage specification (7.5Vpk) differs in measurement units from the main part. This option is suitable only for applications where through-hole mounting is acceptable and output current requirements do not exceed 50mA.

Frequently Asked Questions (FAQ)

Q: Can 4N32SM or 4N33SR2M be used as direct replacements for 4N32S?

A: Both parts are functionally compatible for applications where the isolation voltage requirement is 4170Vrms or lower. The reduced isolation voltage and narrower operating temperature range (-40°C ~ 100°C versus -55°C ~ 100°C) must be evaluated against application specifications. Both maintain identical output current (150mA), output voltage (30V), and switching characteristics.

Q: What is the difference between 4N32SM and 4N33SR2M?

A: Both parts are electrically identical with 4170Vrms isolation and identical electrical characteristics. The primary difference is packaging: 4N32SM is supplied in Tube format, while 4N33SR2M is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements and volume considerations.

Q: Is 4N32SMT&R suitable as a substitute?

A: 4N32SMT&R is not a direct substitute due to package type (through-hole 6-DIP versus surface mount 6-SMD) and reduced output current (50mA versus 150mA). It is suitable only for applications using through-hole assembly and requiring output current of 50mA or less. The isolation voltage specification also differs in measurement methodology.

Q: What compliance certifications are relevant for substitution?

A: The 4N32SM and 4N33SR2M are ROHS3 compliant with REACH Unaffected status. The 4N32SMT&R also carries ROHS3 compliance and REACH Unaffected status. All parts have MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions.

Q: How does the operating temperature range affect substitution?

A: The 4N32S operates from -55°C to 100°C. The 4N32SM and 4N33SR2M operate from -40°C to 100°C, which is acceptable for applications not requiring operation below -40°C. The 4N32SMT&R maintains the full -55°C to 100°C range. Application temperature requirements must be verified before selection.