IL4108-X016 Equivalent & Substitute Parts

Part Overview

The IL4108-X016 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 features zero-crossing detection and is designed for AC switching applications requiring high voltage isolation. As an active product with established market availability, equivalent alternatives exist from other manufacturers that meet comparable electrical and mechanical specifications for applications where component sourcing flexibility is required.

Substiute Parts

IL4108-X016

Vishay Semiconductor Opto DivisionIn Stock: 892IL4108-X016 Datasheet

Current PartRFQ

FOD4108TV

onsemiIn Stock: 1887FOD4108TV Datasheet

MFR RecommendedRFQ

FOD4118TV

onsemiIn Stock: 2381FOD4118TV Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the IL4108-X016 are qualified based on the following critical parameters that determine functional equivalence:

Core Electrical Criteria:

• Output Type: Triac (mandatory match)
• Zero Crossing Circuit: Yes (mandatory match)
• Number of Channels: 1 (mandatory match)
• Voltage - Isolation: Minimum 5000Vrms (IL4108-X016 specifies 5300Vrms; substitutes at 5000Vrms remain within acceptable isolation range for equivalent applications)
• Voltage - Off State: 800V (common across all parts)
• Static dV/dt (Min): 10kV/µs (common across all parts)
• Operating Temperature Range: -55°C ~ 100°C (common across all parts)

Mechanical Criteria:

• Package / Case: 6-DIP (all substitutes use 6-DIP format)
• Mounting Type: Through Hole (all substitutes are through-hole mounted)

Compliance Criteria:

• RoHS Status: ROHS3 Compliant (all parts meet this requirement)
• Approval Agencies: CSA, VDE (common certifications across all parts)

The FOD4108TV and FOD4118TV from onsemi meet these core substitution criteria. Differences in LED trigger current (Ift), turn-on time, and forward voltage represent acceptable parameter variations within the triac optoisolator category and do not prevent functional substitution in standard AC switching applications.

Parameter Comparison

Engineering Selection Recommendations

Both FOD4108TV and FOD4118TV are active products with ROHS3 compliance and CSA/VDE certifications, meeting the regulatory requirements of the IL4108-X016. The FOD4108TV maintains electrical parameters closest to the IL4108-X016, with matching LED trigger current (2mA) and hold current (500µA). The FOD4118TV offers lower LED trigger current (1.3mA), which may reduce input drive requirements in certain circuit designs.

All three parts are through-hole mounted 6-DIP optoisolators with triac output and zero-crossing detection. The primary physical difference is DIP body width: IL4108-X016 uses 0.300" (7.62mm) spacing, while both onsemi substitutes use 0.400" (10.16mm) spacing. This difference requires PCB layout verification to confirm footprint compatibility before component selection.

The IL4108-X016 specifies higher maximum DC forward current (60mA vs. 30mA) and faster turn-on time (35µs vs. 60µs). Applications requiring these specific performance characteristics should retain the original part number. For general AC switching applications where these parameters are not critical design constraints, either onsemi substitute provides functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can FOD4108TV or FOD4118TV be used as direct pin-for-pin replacements for IL4108-X016?

A: Both onsemi parts are functionally equivalent in 6-DIP triac optoisolator topology and pin configuration. However, the DIP body width differs: IL4108-X016 is 0.300" (7.62mm) while FOD4108TV and FOD4118TV are 0.400" (10.16mm). PCB footprint compatibility must be verified before substitution. If the PCB is designed for the narrower 0.300" spacing, the wider 0.400" parts will not fit without layout modification.

Q: What is the significance of the 5300Vrms isolation voltage on IL4108-X016 compared to 5000Vrms on the onsemi substitutes?

A: The IL4108-X016 provides 300Vrms higher isolation rating. For applications operating at or near maximum isolation voltage limits, the IL4108-X016 offers additional safety margin. For standard industrial AC switching applications operating well below maximum isolation ratings, the 5000Vrms specification of FOD4108TV and FOD4118TV is sufficient.

Q: What is the difference between FOD4108TV and FOD4118TV?

A: Both are onsemi triac optoisolators with identical isolation voltage (5000Vrms), package (6-DIP 0.400"), and operating temperature range. The primary difference is LED trigger current: FOD4108TV specifies 2mA maximum (matching IL4108-X016), while FOD4118TV specifies 1.3mA maximum. FOD4118TV requires lower input drive current, which may reduce power consumption in the control circuit.

Q: Are there any compliance or certification differences between these parts?

A: All three parts are ROHS3 compliant. IL4108-X016 lists CSA, UR, and VDE approvals. FOD4108TV and FOD4118TV list CSA, UL, and VDE approvals. Both certification sets meet standard industrial requirements. The substitution of UR with UL represents equivalent regulatory coverage for most applications.

Q: What parameters must remain constant for substitution to be valid?

A: Output type (triac), zero-crossing circuit (yes), number of channels (1), package type (6-DIP), mounting type (through-hole), and operating temperature range (-55°C to 100°C) must match. Isolation voltage must be at least 5000Vrms. These parameters define functional equivalence for AC switching applications.