MOC3083FR2M Optoisolator Equivalent & Substitute Parts

Part Overview

The MOC3083FR2M is a 7.5kV isolation optoisolator with triac output manufactured by onsemi in a 6-SMD surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part features a single channel with zero-crossing detection, suitable for AC switching applications requiring galvanic isolation.

Substiute Parts

MOC3083FR2M

onsemiIn Stock: 790MOC3083FR2M Datasheet

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MOC3083SR2M

onsemiIn Stock: 15286MOC3083SR2M Datasheet

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EL3081

Everlight Electronics Co LtdIn Stock: 24397EL3081 Datasheet

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EL3082

Everlight Electronics Co LtdIn Stock: 1642EL3082 Datasheet

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EL3083

Everlight Electronics Co LtdIn Stock: 94310EL3083 Datasheet

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Q3082

QT Brightek (QTB)In Stock: 921Q3082 Datasheet

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Q3083

QT Brightek (QTB)In Stock: 835Q3083 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the MOC3083FR2M is determined by the following critical parameters:

• Output Type: Triac output required
• Number of Channels: Single channel
• Zero Crossing Circuit: Must be present
• Voltage - Isolation: Minimum 5000Vrms acceptable (MOC3083FR2M operates at 7500Vpk)
• Voltage - Off State: 800 V standard across all candidates
• Current - LED Trigger (Ift): Maximum 5mA to 15mA range
• Current - Hold (Ih): 280µA to 500µA typical
• Current - DC Forward (If): 60 mA maximum
• Mounting Type: Surface mount or through-hole acceptable depending on application redesign tolerance
• Package Compatibility: 6-SMD surface mount or 6-DIP through-hole

The MOC3083SR2M (onsemi) provides the closest direct substitute with surface mount packaging. Everlight Electronics (EL3081, EL3082, EL3083) and QT Brightek (Q3082, Q3083) alternatives require package transition from surface mount to through-hole, but maintain electrical compatibility within specified parameters.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute (Recommended for Direct Replacement): MOC3083SR2M maintains identical surface mount packaging (6-SMD, Gull Wing) and is manufactured by onsemi. This part is active in production with UL approval and ROHS3 compliance. The isolation voltage of 4170Vrms is lower than the original 7500Vpk specification; applications requiring the full 7500Vpk isolation must evaluate circuit requirements before substitution.

Secondary Substitutes (Package Redesign Required): EL3083 (Everlight Electronics) and Q3083 (QT Brightek) both feature 5mA LED trigger current matching the original specification and are available in high inventory quantities. Both require transition from surface mount to 6-DIP through-hole packaging. EL3083 offers broader approval agency certifications (CSA, DEMKO, FIMKO, NEMKO, SEMKO, UL) and extended operating temperature range (-55°C to 100°C). Q3083 provides VDE and UR certifications with ROHS3 compliance.

Alternative Options: EL3081, EL3082, and Q3082 are functionally compatible but feature higher LED trigger current specifications (15mA, 10mA, and 10mA respectively), requiring driver circuit evaluation for compatibility.

Frequently Asked Questions (FAQ)

Q: Can MOC3083SR2M directly replace MOC3083FR2M without PCB modification? A: Yes. Both parts use identical 6-SMD, Gull Wing surface mount packaging and pinout. The primary difference is isolation voltage rating (4170Vrms vs. 7500Vpk). Verify that your application isolation requirements do not mandate the higher voltage specification.

Q: What is the key difference between surface mount (MOC3083SR2M) and through-hole (EL3083, Q3083) alternatives? A: Surface mount parts (6-SMD) are soldered directly to PCB pads and require SMD assembly equipment. Through-hole parts (6-DIP) use lead-based connections inserted into PCB holes. Switching between these package types requires PCB redesign and different assembly processes.

Q: Are all substitute parts RoHS3 compliant? A: MOC3083SR2M, EL3081, EL3082, EL3083, Q3082, and Q3083 are all ROHS3 compliant. The original MOC3083FR2M compliance status is not specified in available documentation.

Q: Which substitute offers the broadest regulatory approvals? A: EL3083 (Everlight Electronics) carries approvals from CSA, DEMKO, FIMKO, NEMKO, SEMKO, and UL. This makes it suitable for applications requiring multi-regional compliance.

Q: Does lower LED trigger current (5mA) in EL3083 and Q3083 affect circuit design? A: No. Lower LED trigger current indicates more sensitive input triggering. Designs using 5mA trigger specifications (MOC3083FR2M, MOC3083SR2M, EL3083, Q3083) are directly compatible. Parts with 10mA or 15mA specifications require higher input drive current.

Q: What is the inventory status of these substitutes? A: MOC3083SR2M has 15,227 units in stock. EL3083 has the highest availability at 94,200 units. Q3083 and Q3082 have lower inventory (804 and 908 units respectively). EL3081 and EL3082 have 24,320 and 1,548 units available.

Q: Can I use EL3081 or EL3082 as substitutes despite higher LED trigger current? A: Electrical substitution is possible if your input driver circuit can supply 15mA (EL3081) or 10mA (EL3082) trigger current. Verify driver output capability before selection.