IL208AT Optoisolator Equivalent & Substitute Parts

Part Overview

The IL208AT is an active optoisolator transistor with base output manufactured by Vishay Semiconductor Opto Division. This component provides 4000Vrms isolation with a single channel configuration in an 8-SOIC surface mount package. The IL208AT is classified as an active product with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance, isolation voltage, package compatibility, and operational temperature ranges align with application requirements.

Substiute Parts

IL208AT

Vishay Semiconductor Opto DivisionIn Stock: 17143IL208AT Datasheet

Current PartRFQ

VO208AT

Vishay Semiconductor Opto DivisionIn Stock: 3170VO208AT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the IL208AT is determined by strict alignment across the following critical parameters:

• Voltage - Isolation: 4000Vrms minimum
• Package / Case: 8-SOIC form factor with identical pin configuration
• Output Type: Transistor with Base configuration
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• Product Status: Active

The VO208AT qualifies as a manufacturer-recommended substitute based on matching isolation voltage, identical package geometry, equivalent output stage configuration, and active product status. Both components share the same base product lineage and are manufactured by the same supplier division.

Parameter Comparison

Engineering Selection Recommendations

The VO208AT is the manufacturer-recommended substitute for the IL208AT. Both components maintain active product status and full RoHS3 compliance. Selection between these parts depends on specific application constraints:

The IL208AT provides an extended operating temperature range of -55°C to 100°C, making it suitable for applications requiring operation at lower ambient temperatures. The VO208AT operates within -40°C to 100°C and features a higher minimum current transfer ratio of 160% compared to the IL208AT's 100%, providing improved optical coupling efficiency at the lower specification limit. Both parts are electrically and mechanically compatible within their respective temperature operating windows.

Frequently Asked Questions (FAQ)

Q: Can VO208AT replace IL208AT in all applications?

A: Substitution is valid when the application operating temperature does not fall below -40°C. If the circuit requires operation at temperatures between -55°C and -40°C, the IL208AT is the required choice. For applications within the -40°C to 100°C range, both parts are functionally equivalent.

Q: Are the package dimensions identical?

A: Yes. Both IL208AT and VO208AT use the 8-SOIC package with 0.154" width and 3.90mm body dimension. PCB footprints and land patterns are identical.

Q: What is the difference in current transfer ratio specifications?

A: The IL208AT specifies a minimum current transfer ratio of 100% at 10mA input current, while the VO208AT specifies 160% minimum at the same input level. Both reach a maximum of 320%. The VO208AT provides tighter lower-bound performance, resulting in more consistent optical coupling characteristics across production lots.

Q: Do both parts meet the same compliance standards?

A: Yes. Both IL208AT and VO208AT are ROHS3 compliant with MSL rating of 1 (Unlimited). Both carry identical ECCN and HTSUS classifications.

Q: What is the isolation voltage rating?

A: Both parts provide 4000Vrms isolation voltage, suitable for high-voltage signal isolation applications.