Is there a pin-compatible replacement for MOC3083M?

No direct pin-to-pin replacement with identical key parameters was identified. The MOC3052M shares the same 6-DIP package but has a lower 600V rating and lacks the zero-crossing feature, making it a high-risk downgrade.

What risks should I check before replacing MOC3083M?

Key risks include: 1) Package mismatch (DIP vs. SMD) requiring board redesign. 2) Functional mismatch (zero-cross vs. random-phase) which can affect load control and EMI. 3) Electrical stress from using a part with a lower off-state voltage (e.g., 600V or 400V instead of 800V).

MOC3083M Alternatives, Datasheet & Cross Reference | onsemi

MOC3083M is a 6-pin DIP zero-cross optocoupler with an 800V triac driver. Key considerations for finding a replacement include matching the zero-crossing function, 800V off-state voltage, and 5mA trigger current.

AI replacement insight

Package riskhigh

Alternates are often in different packages (SMD vs. DIP), requiring board redesign.

Electrical riskhigh

Using parts with lower voltage ratings (e.g., 600V) or different functions (random-phase) is a major risk.

Sourcing risklow

The MOC3083 series is widely available from multiple vendors.

Can it be replaced directly?

No direct drop-in replacement for MOC3083M was found. Candidates in the same package have critical electrical or functional differences.

Best replacement path

Use MOC3083SR2M for new PCB layouts; no direct drop-in replacement was found in this review.

Main risk

The primary risk is functional mismatch (zero-cross vs. random-phase) and electrical overstress from using a part with a lower voltage rating.

Recommended alternatives

Shares the same DIP-6 package but is a random-phase driver with a lower 600V rating.

View details

Alternative comparison matrix

Feature / factor	MOC3083M	MOC3083SR2M	MOC3052M	Compatibility / risk
Package	6-DIP (0.300", 7.62mm)	6-SMD, Gull Wing	6-DIP (0.300", 7.62mm)	6-SMD, Gull Wing / 6-DIP (0.300", 7.62mm) — Candidate is Surface Mount (SMD), target is Through-Hole (DIP).; MOC3052M: Package is form-fit compatible.
Zero Crossing	Yes	Yes	No (Random Phase)	Yes / No (Random Phase) — Both parts have zero-crossing circuits.; MOC3052M: Candidate is random-phase, target is zero-cross. Functional mismatch.
Voltage	7500 Vac(pk)	4170Vrms	600 V	4170Vrms / 600 V — Isolation voltage is lower than target's 7500Vpk rating.; MOC3052M: Off-state voltage is lower, increasing risk in 240VAC circuits.
Current	5 mA	5 mA	10 mA	5 mA / 10 mA — LED trigger current matches.; MOC3052M: Higher LED trigger current required.

Application & sourcing insights

Questions & answers

The MOC3083SR2M offers identical electrical performance but in a surface-mount (SMD) package, making it a strong functional alternative for new designs. For a drop-in replacement, no exact pin-compatible part was found in this review; careful parameter matching is required.