4N32 Optoisolator Equivalent & Substitute Parts

Part Overview

The 4N32 is an optoisolator with Darlington output and base connection, manufactured by Vishay Semiconductor Opto Division. This component provides 5300Vrms isolation voltage in a 6-DIP through-hole package and is classified as obsolete. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and system maintenance. Substitute parts maintain functional compatibility while offering improved availability or enhanced electrical characteristics.

Substiute Parts

4N32

Vishay Semiconductor Opto DivisionIn Stock: 1526684N32 Datasheet

Current PartRFQ

4N33

onsemiIn Stock: 47424N33 Datasheet

Parametric EquivalentRFQ

4N33-X001

Vishay Semiconductor Opto DivisionIn Stock: 8194N33-X001 Datasheet

Parametric EquivalentRFQ

4N32M

onsemiIn Stock: 224684N32M Datasheet

MFR RecommendedRFQ

MCA230

Isocom Components 2004 LTDIn Stock: 4291MCA230 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 4N32 are classified based on electrical parameter compatibility and package equivalence. The primary substitution criteria are:

Critical Parameters for Substitution:

• Isolation voltage: 5300Vrms or higher
• Package type: 6-DIP through-hole configuration
• Output type: Darlington with base connection
• Input type: DC
• Operating temperature range: -55°C to 100°C minimum
• Current transfer ratio: 500% @ 10mA minimum

Substitution Categories:

Parametric Equivalents maintain all critical electrical parameters and package specifications, enabling direct replacement without circuit modification.

Manufacturer Recommended Substitutes may have reduced isolation voltage or modified electrical characteristics but are actively supported by manufacturers for applications where the reduced specifications are acceptable.

Parameter Comparison

Engineering Selection Recommendations

4N33 (onsemi) - Parametric Equivalent

The 4N33 maintains full electrical equivalence to the 4N32 with identical isolation voltage (5300Vrms), current transfer ratio (500% @ 10mA), and operating temperature range (-55°C to 100°C). The 4N33 offers higher output current capability (150mA versus 100mA) and is classified as obsolete. This part is suitable for direct replacement in applications where the enhanced current rating does not create design conflicts. Both parts are ROHS3 compliant where specified.

4N33-X001 (Vishay Semiconductor Opto Division) - Parametric Equivalent

The 4N33-X001 is an active product offering complete electrical equivalence to the 4N32, including 5300Vrms isolation voltage, 500% current transfer ratio, and identical output current (100mA). This part is manufactured by the same supplier as the original 4N32 and maintains ROHS3 compliance. The active product status provides superior long-term availability and supply chain stability. This is the preferred substitute for applications requiring exact electrical specifications and ongoing manufacturer support.

4N32M (onsemi) - Manufacturer Recommended Substitute

The 4N32M is an active product with reduced isolation voltage (4170Vrms versus 5300Vrms) and a narrower operating temperature range (-40°C to 100°C versus -55°C to 100°C). The 4N32M provides higher output current (150mA) and maintains the 500% current transfer ratio. This substitute is appropriate for applications where the lower isolation voltage and reduced low-temperature performance are acceptable. The active status and high inventory availability support production continuity.

MCA230 (Isocom Components 2004 LTD) - Parametric Equivalent

The MCA230 maintains 5300Vrms isolation voltage and the 6-DIP package configuration. However, the current transfer ratio is reduced to 100% @ 10mA (versus 500% @ 10mA for the 4N32), and output current is not specified. The turn-on time is increased to 10µs (versus 5µs). The MCA230 is an active product with ROHS3 compliance. This substitute is suitable only for applications where the reduced current transfer ratio and extended switching time do not impact circuit performance.

Frequently Asked Questions (FAQ)

Q: Can the 4N33 directly replace the 4N32 in all applications?

A: The 4N33 maintains electrical equivalence across all critical parameters including isolation voltage (5300Vrms), current transfer ratio (500% @ 10mA), and package configuration (6-DIP). The 4N33 provides higher output current capability (150mA versus 100mA), which does not create compatibility issues. Direct replacement is supported without circuit modification.

Q: What is the primary difference between the 4N33-X001 and the 4N32?

A: The 4N33-X001 is electrically identical to the 4N32 but is manufactured by Vishay and maintains active product status. Both parts share the same isolation voltage (5300Vrms), current transfer ratio (500% @ 10mA), output current (100mA), and operating temperature range (-55°C to 100°C). The key advantage of the 4N33-X001 is ongoing manufacturer support and availability.

Q: When should the 4N32M be used instead of the 4N33-X001?

A: The 4N32M should be selected when isolation voltage requirements are 4170Vrms or lower and operating temperature does not extend below -40°C. The 4N32M offers higher output current (150mA) and active product status with superior inventory availability. Applications requiring the full 5300Vrms isolation voltage or -55°C operation must use the 4N33-X001 or 4N33.

Q: Is the MCA230 suitable as a general replacement for the 4N32?

A: The MCA230 is not a general replacement due to significantly reduced current transfer ratio (100% @ 10mA versus 500% @ 10mA) and unspecified output current. The MCA230 is suitable only for applications where the reduced current transfer ratio and extended turn-on time (10µs versus 5µs) are acceptable. Circuit validation is required before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: The 4N33-X001, 4N32M, and MCA230 are confirmed ROHS3 compliant. The 4N33 (onsemi) does not specify RoHS status in the provided data. Compliance verification with the specific supplier is recommended for the 4N33 if RoHS certification is a design requirement.

Q: What is the impact of the 4N32M's reduced operating temperature range?

A: The 4N32M operates from -40°C to 100°C, compared to the 4N32's -55°C to 100°C range. Applications requiring operation below -40°C must use the 4N32, 4N33, 4N33-X001, or MCA230. The 4N32M is suitable for applications with minimum operating temperatures of -40°C or higher.

Q: Can the 4N32 be replaced with any of these substitutes in high-isolation-voltage applications?

A: Applications requiring 5300Vrms isolation voltage must use the 4N32, 4N33, 4N33-X001, or MCA230. The 4N32M provides only 4170Vrms isolation and is not suitable for high-isolation-voltage applications. Verify isolation voltage requirements before selecting the 4N32M.

Q: What is the significance of the current transfer ratio difference between the 4N32 and MCA230?

A: The 4N32 and 4N33-X001 provide 500% current transfer ratio @ 10mA, while the MCA230 provides 100% @ 10mA. This five-fold difference affects input current requirements and circuit design. Applications designed for 500% transfer ratio may require redesign if the MCA230 is substituted. The MCA230 is suitable only for applications where the lower transfer ratio is acceptable.

Q: Are all substitute parts available in tube packaging?

A: The 4N33-X001, 4N32M, and MCA230 are specified as tube packaging. The 4N33 (onsemi) does not specify packaging format in the provided data. Packaging confirmation with the supplier is recommended for the 4N33 if tube packaging is a procurement requirement.