FOD817W Equivalent & Substitute Parts

Part Overview

The FOD817W is a 5000Vrms optoisolator with transistor output manufactured by onsemi in a 4-DIP package. This component provides galvanic isolation for low-speed digital signal transmission in industrial and consumer applications. The FOD817W is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain identical electrical performance and mechanical compatibility to ensure direct replacement capability.

Substiute Parts

FOD817W

onsemiIn Stock: 814FOD817W Datasheet

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FOD817300W

Fairchild SemiconductorIn Stock: 1131FOD817300W Datasheet

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LTV-817M

Lite-On Inc.In Stock: 7991LTV-817M Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FOD817W are qualified based on the following critical parameters that define functional equivalence:

• Isolation voltage of 5000Vrms minimum
• Single channel transistor output configuration
• Current transfer ratio range of 50% to 600% @ 5mA
• Maximum output voltage of 70V or greater
• Maximum output current of 50mA
• Rise and fall times of 4µs and 3µs respectively
• 4-DIP through-hole package with 0.400" (10.16mm) pitch
• Operating temperature range of -55°C to 110°C

Parts meeting all these criteria are electrically and mechanically interchangeable with the FOD817W in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

FOD817300W (Fairchild Semiconductor) is a direct equivalent to the FOD817W with identical electrical specifications and active product status, ensuring long-term availability and supply chain continuity. This part is the preferred substitute for new designs and production replacement.

LTV-817M (Lite-On Inc.) meets all critical substitution criteria with one exception: maximum output voltage is rated at 35V compared to 70V for the FOD817W. This part is suitable for applications where output voltage does not exceed 35V. The LTV-817M carries RoHS3 compliance certification and is available in higher inventory quantities. Both substitute parts are classified as active products with established manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can FOD817300W directly replace FOD817W in existing designs? A: Yes. FOD817300W matches all electrical and mechanical specifications of FOD817W, including isolation voltage, current transfer ratio, output voltage, output current, timing characteristics, and package configuration. Direct substitution is supported without circuit modification.

Q: What is the key difference between LTV-817M and FOD817W? A: LTV-817M has a maximum output voltage rating of 35V versus 70V for FOD817W. If your circuit operates the output transistor above 35V, LTV-817M is not suitable. For applications with output voltage ≤35V, LTV-817M is fully compatible.

Q: Are all three parts pin-compatible? A: Yes. All three parts use the 4-DIP package with identical 0.400" (10.16mm) pitch and through-hole mounting, ensuring mechanical and electrical pin compatibility on standard PCBs.

Q: Which substitute part should I select for new production? A: FOD817300W is recommended for new designs due to identical specifications and active product status. LTV-817M is an alternative if output voltage requirements are ≤35V and RoHS3 compliance is required.

Q: Are there any compliance differences between these parts? A: FOD817300W and LTV-817M both carry ECCN EAR99 classification. LTV-817M includes RoHS3 compliance certification. All three parts share the same HTSUS code 8541.49.8000.