VO4158D Optoisolator Equivalent & Substitute Parts

Part Overview

The VO4158D is an optoisolator with triac output manufactured by Vishay Semiconductor Opto Division. This component provides galvanic isolation up to 5300Vrms with integrated zero-crossing detection, designed for AC switching applications requiring high voltage isolation. The part is currently in active production status with 1700 units available in stock. Substitute parts are identified when equivalent electrical and mechanical parameters align within the allowed specifications for this optoisolator category, enabling component interchangeability in design implementations.

Substiute Parts

VO4158D

Vishay Semiconductor Opto DivisionIn Stock: 1791VO4158D Datasheet

Current PartRFQ

MOC3083

Lite-On Inc.In Stock: 60780MOC3083 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the VO4158D is determined by alignment of the following critical parameters:

• Isolation Voltage: Minimum 5000Vrms required for functional equivalence
• Output Configuration: Triac output with zero-crossing detection
• Channel Count: Single channel
• Package Footprint: 6-DIP (0.300", 7.62mm) for mechanical compatibility
• Mounting Method: Through-hole technology
• Temperature Operating Range: Overlap within specified limits
• Compliance Standards: RoHS3 compliance and regulatory certifications

The MOC3083 from Lite-On Inc. meets these substitution criteria with isolation voltage of 5000Vrms, triac output, zero-crossing circuit, single channel configuration, and identical 6-DIP package footprint.

Parameter Comparison

Engineering Selection Recommendations

Both the VO4158D and MOC3083 are active production components with ROHS3 compliance and unlimited moisture sensitivity rating. The VO4158D offers higher isolation voltage (5300Vrms versus 5000Vrms) and superior static dV/dt performance (5kV/µs versus 800V/µs), along with extended low-temperature operation (-55°C versus -40°C). The MOC3083 features lower LED trigger current (5mA versus 1.6mA) and higher inventory availability (60720 units versus 1700 units). Selection between these parts depends on specific application requirements for isolation voltage margin, dV/dt immunity, temperature range, and component availability.

Frequently Asked Questions (FAQ)

Q: Can MOC3083 directly replace VO4158D in existing designs?

A: Direct replacement is possible when the application does not require the VO4158D's higher isolation voltage (5300Vrms) or superior dV/dt performance (5kV/µs). Both parts share identical 6-DIP package footprint, through-hole mounting, and triac output with zero-crossing detection. Pin-to-pin compatibility exists for standard circuit implementations.

Q: What are the key differences in electrical performance?

A: The VO4158D provides 300Vrms higher isolation voltage and 5x faster dV/dt response compared to MOC3083. The MOC3083 requires higher LED trigger current (5mA versus 1.6mA). Both maintain identical off-state voltage (800V) and forward voltage (1.2V typical).

Q: Are there temperature range limitations for substitution?

A: The VO4158D operates from -55°C to 100°C, while MOC3083 operates from -40°C to 100°C. Applications requiring operation below -40°C must use the VO4158D. Both parts support the standard 0°C to 70°C industrial temperature range.

Q: Do both parts meet the same regulatory certifications?

A: Both VO4158D and MOC3083 are ROHS3 compliant with MSL rating of 1 (Unlimited). The VO4158D carries cUR, FIMKO, and UR approvals. The MOC3083 carries CSA, FIMKO, and UL approvals. Application-specific certification requirements should be verified against end-use regulatory standards.

Q: What is the impact of different dV/dt ratings on circuit design?

A: The VO4158D's 5kV/µs static dV/dt specification provides superior immunity to fast voltage transients compared to MOC3083's 800V/µs rating. Applications with high dV/dt environments (such as high-frequency switching circuits) benefit from the VO4158D's enhanced transient immunity.