FOD819S Optoisolator Equivalent & Substitute Parts

Part Overview

The FOD819S is a single-channel optoisolator with transistor output manufactured by onsemi, designed for high-voltage isolation applications requiring 5000Vrms isolation rating. This component integrates an LED input stage with a phototransistor output stage in a 4-SMD surface mount package. The FOD819S is classified as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is essential for design continuity, inventory management, and long-term product support when original stock becomes unavailable.

Substiute Parts

FOD819S

onsemiIn Stock: 1785FOD819S Datasheet

Current PartRFQ

FOD819SD

onsemiIn Stock: 2709FOD819SD Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FOD819S is determined by strict equivalence across electrical and mechanical parameters. The primary substitute identified is the FOD819SD, which maintains identical electrical specifications including isolation voltage, current transfer ratio range, output voltage and current ratings, and operating temperature range. Both parts share the same base product number (FOD819) and are manufactured by onsemi.

The key parameters governing substitution are:

• Voltage - Isolation: 5000Vrms (must match exactly)
• Number of Channels: 1 (must match exactly)
• Current Transfer Ratio: 100% to 600% @ 1.5mA (must match exactly)
• Output Type: Transistor (must match exactly)
• Voltage - Output (Max): 80V (must match exactly)
• Current - Output / Channel: 30mA (must match exactly)
• Operating Temperature Range: -55°C ~ 110°C (must match exactly)
• Mounting Type: Surface Mount (must match exactly)
• Package / Case: 4-SMD, Gull Wing (must match exactly)

The FOD819SD differs from the FOD819S only in packaging format: FOD819SD is supplied in Cut Tape (CT) format, while FOD819S is supplied in Tape & Reel (TR) format. This distinction affects procurement and handling but does not alter component functionality or electrical performance.

Parameter Comparison

Engineering Selection Recommendations

The FOD819SD is a direct electrical and functional equivalent to the FOD819S. Both components are manufactured by onsemi, share identical electrical specifications, and maintain the same 4-SMD surface mount package configuration. Both parts carry Last Time Buy status, indicating that neither component will receive future production runs.

Selection between FOD819S and FOD819SD should be based on packaging requirements and procurement logistics. The FOD819S is supplied in Tape & Reel (TR) format, suitable for high-volume automated assembly operations. The FOD819SD is supplied in Cut Tape (CT) format, appropriate for lower-volume applications or manual assembly processes.

Both parts maintain ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements for industrial and commercial applications. The identical MSL rating of 1 (Unlimited) indicates both components have no moisture sensitivity constraints during storage and handling.

Frequently Asked Questions (FAQ)

Q: Can FOD819SD be used as a direct replacement for FOD819S in existing designs?

A: Yes. The FOD819SD is electrically and functionally identical to the FOD819S. All electrical parameters, including isolation voltage, current transfer ratio, output voltage and current ratings, and operating temperature range are identical. The components share the same 4-SMD surface mount package and pinout. The only difference is the packaging format (Cut Tape versus Tape & Reel).

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Tape & Reel (TR) packaging supplies components on a continuous reel suitable for automated pick-and-place assembly equipment. Cut Tape (CT) packaging supplies components on tape segments cut to specific lengths, typically used for lower-volume applications or manual assembly. Both formats contain identical components with identical electrical specifications.

Q: Are both FOD819S and FOD819SD still in production?

A: No. Both parts carry Last Time Buy status, indicating that onsemi has discontinued production and will not manufacture additional units. Existing inventory should be evaluated for long-term supply planning.

Q: Do FOD819S and FOD819SD have the same pinout and footprint?

A: Yes. Both components use the 4-SMD, Gull Wing package configuration with identical pinout and PCB footprint. No design modifications are required when substituting between these parts.

Q: What compliance certifications apply to both parts?

A: Both FOD819S and FOD819SD are ROHS3 compliant and REACH Unaffected. Both carry MSL rating 1 (Unlimited), indicating no moisture sensitivity constraints.