IL205AT Optoisolator Transistor with Base Output - Equivalent & Substitute Parts

Part Overview

The IL205AT is an active optoisolator manufactured by Vishay Semiconductor Opto Division, designed for high-voltage isolation applications requiring galvanic separation between input and output circuits. This component integrates a photodiode input stage with a transistor output stage including base connection, providing 4000Vrms isolation in a compact 8-SOIC surface mount package. The IL205AT maintains active product status with substantial inventory availability, making it suitable for new designs and production applications requiring reliable isolation in industrial and consumer electronics.

Substitute parts are identified when equivalent electrical performance, isolation rating, package compatibility, and compliance certifications align with the original specification, enabling component interchangeability without circuit redesign.

Substiute Parts

IL205AT

Vishay Semiconductor Opto DivisionIn Stock: 80208IL205AT Datasheet

Current PartRFQ

VO205AT

Vishay Semiconductor Opto DivisionIn Stock: 1919VO205AT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the IL205AT is determined by strict alignment across the following critical parameters:

• Voltage isolation rating: 4000Vrms minimum
• Output configuration: Transistor with base connection
• Current transfer ratio range: 40% to 80% @ 10mA
• Maximum output voltage: 70V or greater
• Package type: 8-SOIC form factor with identical pin pitch (0.154", 3.90mm width)
• Surface mount compatibility: Identical mounting technology
• Compliance: ROHS3 certification and EAR99 export classification
• Moisture sensitivity: MSL 1 rating

The VO205AT meets all substitution criteria, maintaining identical isolation voltage, output stage configuration, current transfer ratio specifications, and package geometry. Both components are manufactured by Vishay Semiconductor Opto Division and share the same base product lineage, ensuring design compatibility and functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

Both IL205AT and VO205AT are active products with ROHS3 compliance and EAR99 export classification. Selection between these components depends on operating temperature requirements:

The IL205AT supports the extended temperature range of -55°C to 100°C, making it suitable for applications requiring operation at temperatures below -40°C or in environments with extreme cold exposure.

The VO205AT operates within -40°C to 100°C, covering standard industrial and commercial temperature ranges. This component is appropriate for applications where the lower temperature limit does not fall below -40°C.

All other electrical, mechanical, and compliance parameters are identical between both parts. Pin-for-pin compatibility and identical package geometry ensure direct substitution within the specified temperature operating range of the target application.

Frequently Asked Questions (FAQ)

Q: Can VO205AT replace IL205AT in all applications?

A: VO205AT is a direct substitute for IL205AT in applications where the operating temperature remains within -40°C to 100°C. If your circuit requires operation below -40°C, the IL205AT is required due to its extended lower temperature specification of -55°C.

Q: Are the pin configurations identical between IL205AT and VO205AT?

A: Yes. Both components use the 8-SOIC package with identical pin pitch (0.154", 3.90mm width) and pin assignments. No PCB layout modifications are required for substitution.

Q: Do both parts have the same isolation voltage rating?

A: Yes. Both IL205AT and VO205AT provide 4000Vrms isolation voltage, meeting identical galvanic separation requirements.

Q: What is the difference in current transfer ratio between these parts?

A: There is no difference. Both components specify a current transfer ratio of 40% to 80% @ 10mA, ensuring equivalent optical coupling efficiency and output drive capability.

Q: Are both parts RoHS compliant?

A: Yes. Both IL205AT and VO205AT are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, meeting environmental and reliability standards for commercial and industrial applications.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes, provided the application's operating temperature range does not exceed the VO205AT specification of -40°C to 100°C. Both parts are surface mount compatible with identical footprints and require no circuit modifications.