VO4158H Optoisolator Equivalent & Substitute Parts

Part Overview

The VO4158H is an optoisolator with triac output manufactured by Vishay Semiconductor Opto Division. This component provides galvanic isolation up to 5300Vrms with a single triac channel in a 6-DIP package. The device is actively produced and widely used in AC switching applications requiring high voltage isolation. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges for this product category.

Substiute Parts

VO4158H

Vishay Semiconductor Opto DivisionIn Stock: 1941VO4158H Datasheet

Current PartRFQ

MOC3083

Lite-On Inc.In Stock: 60780MOC3083 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the VO4158H is determined by the following critical parameters:

• Isolation Voltage: Substitute parts must maintain minimum 5000Vrms isolation to ensure adequate safety margin in high voltage applications
• Output Configuration: Triac output with zero crossing detection is required for AC switching functionality
• Package Compatibility: 6-DIP through-hole package ensures mechanical and electrical pin compatibility
• Current Ratings: LED trigger current (Ift), on-state current (It), and hold current (Ih) must be within acceptable ranges for circuit operation
• Operating Temperature Range: Substitute parts must support the required thermal operating window
• Electrical Characteristics: Forward voltage, DC forward current, and dV/dt performance must be compatible with existing circuit design

The MOC3083 from Lite-On Inc. meets these substitution criteria within the allowed parameter tolerances for this optoisolator category.

Parameter Comparison

Engineering Selection Recommendations

Both the VO4158H and MOC3083 are active products with current manufacturing status. The VO4158H carries approvals from cUR, FIMKO, and UR. The MOC3083 carries approvals from CSA, FIMKO, and UL. Both components are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.49.8000.

Selection between these parts should be based on:

• Availability and lead time requirements
• Specific regulatory certifications required by the end application
• Circuit design margins for LED trigger current and operating temperature range
• Supplier inventory and cost considerations

Frequently Asked Questions (FAQ)

Q: Can MOC3083 directly replace VO4158H in existing designs?

A: Yes, within the specified electrical and mechanical parameters. Both components feature identical 6-DIP packaging, triac output configuration, and zero crossing detection. Verify that your circuit design accommodates the MOC3083's LED trigger current specification of 5mA maximum and operating temperature range of -40°C to 100°C.

Q: What are the key differences between these parts?

A: The VO4158H provides 5300Vrms isolation versus 5000Vrms for the MOC3083. The VO4158H specifies 5kV/µs static dV/dt minimum compared to 800V/µs for the MOC3083. The VO4158H operates from -55°C while the MOC3083 operates from -40°C. LED trigger current maximum is 2mA for VO4158H versus 5mA for MOC3083.

Q: Are the regulatory certifications equivalent?

A: Both parts carry different but overlapping certification bodies. VO4158H is certified by cUR, FIMKO, and UR. MOC3083 is certified by CSA, FIMKO, and UL. Verify that the required certifications for your application are present on the selected part.

Q: Is the 6-DIP package identical between both parts?

A: Yes. Both components use 6-DIP (0.300", 7.62mm) through-hole packaging with identical pin spacing and mechanical dimensions, ensuring direct PCB compatibility.

Q: What should be verified before substitution?

A: Confirm that your circuit design operates within the MOC3083 parameter ranges, particularly LED trigger current (5mA max), on-state current (300mA max), and operating temperature (-40°C to 100°C). Verify that required regulatory certifications are met for your application.