MOC3083 Equivalent & Substitute Parts

Part Overview

The MOC3083 is an optoisolator with triac output designed for applications requiring galvanic isolation and AC load switching. Manufactured by Isocom Components 2004 LTD, this component features zero-crossing detection, 5300Vrms isolation voltage, and a 6-DIP through-hole package. The device is active in production with full RoHS3 compliance and VDE approval. Substitute parts may be required due to packaging constraints, thermal operating range requirements, or supply chain considerations while maintaining functional equivalence within specified electrical parameters.

Substiute Parts

MOC3083

Isocom Components 2004 LTDIn Stock: 60731MOC3083 Datasheet

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MOC3083SR2M

onsemiIn Stock: 15286MOC3083SR2M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MOC3083 is permissible when the following core electrical and mechanical parameters are maintained or exceeded:

• Single-channel triac output optoisolator with zero-crossing detection
• Isolation voltage of 4170Vrms or higher (MOC3083 specifies 5300Vrms)
• Off-state voltage of 800V or higher
• Static dV/dt rating of 600V/µs or higher
• LED trigger current (Ift) of 5mA or lower
• Hold current (Ih) within typical range of 400–500µA
• Forward voltage (Vf) between 1.2V and 1.3V
• DC forward current (If) of 50mA or higher
• RoHS3 compliance and appropriate regulatory approval

The MOC3083SR2M qualifies as a functional substitute based on these criteria, with the primary difference being packaging format (surface mount versus through-hole) and a reduced isolation voltage specification (4170Vrms versus 5300Vrms).

Parameter Comparison

Engineering Selection Recommendations

Selection between MOC3083 and MOC3083SR2M depends on application-specific requirements:

MOC3083 (Through-Hole, 6-DIP) is appropriate for:

• PCB designs utilizing through-hole assembly methods
• Applications requiring 5300Vrms isolation voltage specification
• Designs operating within the -30°C to 100°C temperature range
• Systems requiring VDE regulatory approval

MOC3083SR2M (Surface Mount, 6-SMD) is appropriate for:

• PCB designs utilizing surface-mount assembly methods
• Applications where 4170Vrms isolation voltage is sufficient
• Designs operating within the -40°C to 85°C temperature range
• Systems requiring UL regulatory approval
• High-volume manufacturing with automated assembly processes

Both devices maintain active production status, full RoHS3 compliance, and equivalent core electrical functionality for triac-output optoisolator applications with zero-crossing detection.

Frequently Asked Questions (FAQ)

Q: Can MOC3083SR2M replace MOC3083 in existing through-hole PCB designs?

A: No. MOC3083SR2M uses a 6-SMD surface-mount package, while MOC3083 uses a 6-DIP through-hole package. PCB layout and assembly methods are incompatible. Through-hole designs require MOC3083 or equivalent through-hole triac optoisolators.

Q: Is the lower isolation voltage of MOC3083SR2M (4170Vrms vs. 5300Vrms) a limitation?

A: Substitution feasibility depends on application isolation requirements. If the design specifies 5300Vrms isolation, MOC3083SR2M does not meet this requirement. If the application requires only 4170Vrms or lower, MOC3083SR2M is acceptable.

Q: What is the impact of the different operating temperature ranges?

A: MOC3083 operates from -30°C to 100°C, while MOC3083SR2M operates from -40°C to 85°C. Applications requiring operation above 85°C must use MOC3083. Applications requiring operation below -30°C cannot use MOC3083.

Q: Are the regulatory approvals interchangeable?

A: No. MOC3083 carries VDE approval, while MOC3083SR2M carries UL approval. System-level regulatory requirements determine which approval is necessary. Both devices are RoHS3 compliant.

Q: What are the differences in LED trigger current and hold current?

A: Both devices specify 5mA maximum LED trigger current (Ift). Hold current (Ih) differs slightly: MOC3083 is 400µA typical, while MOC3083SR2M is 500µA typical. This difference is within normal component tolerance and does not affect functional substitution for standard applications.

Q: Can these devices be used interchangeably in new designs?

A: Only if the design requirements explicitly allow for either through-hole or surface-mount packaging, and if the application isolation voltage requirement does not exceed 4170Vrms. New designs should specify the appropriate package type and isolation voltage based on system requirements.