MCA231 Equivalent & Substitute Parts

Part Overview

The MCA231 is a transistor optoisolator manufactured by onsemi, designed for galvanic isolation applications requiring high voltage isolation. This component features Darlington output configuration with 4400Vrms isolation rating in a 6-DIP through-hole package. The MCA231 is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

MCA231

onsemiIn Stock: 1811MCA231 Datasheet

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4N46

Broadcom LimitedIn Stock: 48704N46 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The 4N46 manufactured by Broadcom Limited qualifies as a functional substitute for the MCA231 based on the following alignment of critical parameters:

Matching Parameters:

• Single-channel optoisolator configuration
• Darlington output topology (4N46 includes base output, providing enhanced flexibility)
• Identical 6-DIP through-hole package format (0.300", 7.62mm)
• DC input type
• Identical MSL rating (1 - Unlimited)
• Identical REACH and ECCN classifications

Parameter Variations: The 4N46 operates at 3750Vrms isolation voltage, which is lower than the MCA231's 4400Vrms rating. The 4N46 provides maximum output current of 60mA compared to the MCA231's 150mA, and maximum output voltage of 20V versus 30V. These differences require circuit-level evaluation to confirm suitability for specific applications.

Parameter Comparison

Engineering Selection Recommendations

The 4N46 is an active product from Broadcom Limited, providing supply continuity for applications currently using the obsolete MCA231. The identical package footprint (6-DIP) and through-hole mounting enable direct mechanical replacement without PCB redesign.

Substitution feasibility depends on application-specific requirements regarding isolation voltage, output current, and output voltage ratings. Applications requiring the full 4400Vrms isolation specification of the MCA231 must evaluate whether the 4N46's 3750Vrms rating meets system safety and regulatory requirements. Similarly, circuits designed for 150mA output current must confirm compatibility with the 4N46's 60mA maximum output current specification.

Both components maintain identical REACH and ECCN compliance classifications, supporting regulatory continuity in regulated applications.

Frequently Asked Questions (FAQ)

Q: Can the 4N46 directly replace the MCA231 in all applications?

A: Direct replacement requires verification that the 4N46's lower isolation voltage (3750Vrms versus 4400Vrms), reduced output current (60mA versus 150mA), and lower maximum output voltage (20V versus 30V) meet the specific circuit requirements. Package compatibility is confirmed, but electrical performance must be validated.

Q: What is the primary reason for seeking MCA231 substitutes?

A: The MCA231 is classified as obsolete, making new inventory procurement difficult. The 4N46 is an active product with established supply channels, providing long-term availability for replacement and new designs.

Q: Are there package compatibility concerns between MCA231 and 4N46?

A: Both components use identical 6-DIP through-hole packaging (0.300", 7.62mm), eliminating package-related compatibility issues. Direct PCB footprint compatibility is confirmed.

Q: How do the isolation voltage ratings affect substitution decisions?

A: The MCA231 provides 4400Vrms isolation while the 4N46 provides 3750Vrms. Applications with isolation voltage requirements exceeding 3750Vrms cannot use the 4N46 as a substitute. Applications operating below 3750Vrms isolation requirements can proceed with substitution after confirming other electrical parameters.

Q: What output current limitations should be considered?

A: The MCA231 supports 150mA maximum output current per channel, while the 4N46 supports 60mA. Circuits designed for output currents exceeding 60mA require redesign or alternative component selection.

Q: Do compliance certifications differ between these components?

A: Both components share identical REACH and ECCN classifications (REACH Unaffected, EAR99), maintaining regulatory compliance continuity. The 4N46 is RoHS non-compliant, which may affect applications with RoHS requirements.