MOC3083M Equivalent & Substitute Parts

Part Overview

The MOC3083M is an optoisolator with triac output manufactured by Lite-On Inc., designed for applications requiring galvanic isolation up to 5000Vrms. This component features a zero-crossing circuit, single channel configuration, and 6-DIP through-hole packaging. The part is currently in active production status with substantial inventory availability (105,300 pcs). Substitute parts are identified when equivalent functional performance can be achieved within the allowed electrical and mechanical parameter ranges for optoisolator triac output devices.

Substiute Parts

MOC3083M

Lite-On Inc.In Stock: 105374MOC3083M Datasheet

Current PartRFQ

VO4158H

Vishay Semiconductor Opto DivisionIn Stock: 1941VO4158H Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The VO4158H from Vishay Semiconductor Opto Division qualifies as a substitute for the MOC3083M based on the following critical parameters:

• Output Type: Both devices feature triac output configuration
• Zero Crossing Circuit: Both incorporate zero-crossing detection
• Number of Channels: Both provide single channel isolation
• Mounting Type: Both are through-hole mounted
• Package Category: Both use 6-DIP packaging format
• Isolation Voltage: VO4158H provides 5300Vrms, exceeding the 5000Vrms requirement
• Off State Voltage: Both rated at 800V
• Operating Temperature Range: VO4158H range (-55°C ~ 100°C) encompasses MOC3083M range (-40°C ~ 100°C)
• RoHS Compliance: Both meet ROHS3 requirements

Substitution is valid when the substitute part meets or exceeds the electrical performance requirements of the original part within the specified parameter tolerances.

Parameter Comparison

Engineering Selection Recommendations

Both MOC3083M and VO4158H are active production components with ROHS3 compliance. Selection between these parts should be based on:

• Isolation Voltage Requirement: VO4158H provides higher isolation voltage (5300Vrms vs 5000Vrms), suitable for applications requiring enhanced voltage margin
• LED Trigger Current: VO4158H requires lower trigger current (2mA vs 5mA), reducing input circuit power consumption
• Static dV/dt Performance: VO4158H offers superior dV/dt rating (5kV/µs vs 800V/µs), beneficial for high-speed switching applications
• Temperature Range: VO4158H supports extended lower temperature operation (-55°C vs -40°C)
• Package Dimensions: Physical footprint differs (0.300" vs 0.400" body width); PCB layout compatibility must be verified
• Regulatory Approvals: MOC3083M holds CSA, FIMKO, UL certifications; VO4158H holds cUR, FIMKO, UR certifications

Frequently Asked Questions (FAQ)

Q: Can VO4158H directly replace MOC3083M on existing PCBs?

A: Both parts use 6-DIP through-hole packaging with identical pin configuration. However, the physical body width differs (0.300" vs 0.400"), which may affect PCB layout compatibility depending on component spacing and board design. Pin-to-pin electrical compatibility is confirmed.

Q: What are the key electrical differences between these parts?

A: VO4158H provides higher isolation voltage (5300Vrms), lower LED trigger current (2mA), superior dV/dt performance (5kV/µs), and extended temperature range (-55°C to 100°C). MOC3083M operates within -40°C to 100°C. Both maintain identical forward voltage (1.2V) and off-state voltage (800V).

Q: Are both parts RoHS compliant?

A: Yes, both MOC3083M and VO4158H meet ROHS3 compliance requirements.

Q: Which part should be selected for high-speed switching applications?

A: VO4158H is suitable for high-speed switching due to its superior static dV/dt rating of 5kV/µs compared to MOC3083M's 800V/µs.

Q: Do these parts have different regulatory certifications?

A: Yes. MOC3083M holds CSA, FIMKO, and UL approvals. VO4158H holds cUR, FIMKO, and UR approvals. Application-specific regulatory requirements must be verified before selection.

Q: What is the inventory status of these parts?

A: MOC3083M has 105,300 pcs in stock. VO4158H has 1,914 pcs in stock.