4N32SM Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N32SM is an optoisolator with Darlington output and base connection, manufactured by onsemi. This component provides 4170Vrms isolation voltage in a 6-SMD surface mount package. The part is Active status and widely used in industrial control, power management, and signal isolation applications. Equivalent and substitute parts are identified based on matching electrical characteristics, isolation ratings, output specifications, and package compatibility to ensure direct functional replacement in circuit designs.

Substiute Parts

4N32SM

onsemiIn Stock: 22754N32SM Datasheet

Current PartRFQ

4N33SR2M

onsemiIn Stock: 31544N33SR2M Datasheet

DirectRFQ

4N33SM

onsemiIn Stock: 14404N33SM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 4N32SM are identified based on the following critical parameters that determine functional equivalence:

• Isolation Voltage: 4170Vrms (all substitutes match)
• Output Configuration: Darlington with Base (all substitutes match)
• Number of Channels: 1 (all substitutes match)
• Current Transfer Ratio: 500% @ 10mA minimum (all substitutes match)
• Maximum Output Current: 150mA per channel (all substitutes match)
• Maximum Output Voltage: 30V (all substitutes match)
• Package Type: 6-SMD, Gull Wing (all substitutes match)
• Operating Temperature Range: -40°C ~ 100°C (all substitutes match)
• Compliance: ROHS3 Compliant, MSL 1 (all substitutes match)

The 4N32SM (Tube packaging) has two direct substitutes: 4N33SR2M (Tape & Reel packaging) and 4N33SM (Tube packaging). Both are manufactured by onsemi and share identical electrical and mechanical specifications. The primary difference is packaging format, which affects ordering, handling, and inventory management but does not impact circuit performance.

Parameter Comparison

Engineering Selection Recommendations

All three parts—4N32SM, 4N33SR2M, and 4N33SM—are Active status components from onsemi with identical electrical and mechanical specifications. Selection between these parts is determined by packaging and supply chain requirements:

• 4N32SM (Tube): Select for applications requiring tube packaging format, suitable for lower-volume production or manual assembly processes.
• 4N33SR2M (Tape & Reel): Select for high-volume automated assembly operations where tape and reel packaging is required for pick-and-place equipment.
• 4N33SM (Tube): Select as an alternative tube-packaged option with identical specifications to 4N32SM.

All parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing processes and long-term storage without moisture sensitivity concerns.

Frequently Asked Questions (FAQ)

Q: Can 4N33SR2M replace 4N32SM in a circuit design? A: Yes. Both parts have identical electrical specifications, isolation voltage, output current rating, and operating temperature range. The only difference is packaging format (Tape & Reel vs. Tube). Circuit performance is not affected by this substitution.

Q: What is the difference between Tube and Tape & Reel packaging? A: Tube packaging is used for manual handling and lower-volume applications. Tape & Reel packaging is designed for automated pick-and-place assembly equipment in high-volume production. Both formats contain the same component with identical specifications.

Q: Are all three parts pin-compatible? A: Yes. All three parts use the same 6-SMD, Gull Wing package configuration with identical pinout and electrical characteristics.

Q: Do these parts require different PCB layouts? A: No. The 6-SMD, Gull Wing package footprint is identical across all three parts. PCB design and layout remain unchanged when substituting between 4N32SM, 4N33SR2M, and 4N33SM.

Q: Are there any compliance or certification differences? A: No. All three parts are ROHS3 compliant with MSL 1 rating. Compliance status and certifications are identical.

Q: Which part should I select for new designs? A: Selection depends on manufacturing requirements. For automated assembly, use 4N33SR2M (Tape & Reel). For manual assembly or lower volumes, use 4N32SM or 4N33SM (Tube). All three are equally suitable from an electrical performance perspective.