FOD814A3S

Overview

The FOD814A3S is a transistor output optocoupler from onsemi. It consists of two gallium arsenide infrared emitting diodes connected in inverse parallel, driving a silicon phototransistor. This configuration enables AC or DC input signal isolation. The device provides high-speed switching capabilities with typical rise and fall times of 4µs and 3µs respectively. It features a 5000Vrms isolation voltage and operates within a temperature range of -55°C to 105°C. The component is designed for applications requiring reliable electrical isolation between input and output circuits.

Feature Summary

• Dual infrared LED input configuration supports both AC and DC signal inputs
• High isolation voltage rating ensures safe separation of circuit grounds
• Fast switching speed suitable for data transmission applications

Applications

• Data communication equipment
• Industrial control systems
• AC/DC input signal isolation

Procurement Notes

Verify the exact suffix designation when sourcing, as variations such as FOD814A3SD exist with similar specifications but potentially different packaging or minor parameter tolerances. Confirm availability status as this specific part number may be obsolete or superseded by updated series members. Ensure compliance with RoHS directives if required for your manufacturing process. Cross-reference datasheets for precise thermal and electrical limits before finalizing procurement decisions.

Selection Notes

Select this component when AC or DC input isolation is required without the need for logic-level outputs. The dual-LED input structure simplifies circuit design for bidirectional or alternating current signals. Consider the 70V collector-emitter voltage rating for low-voltage switching applications. Evaluate the 50mA maximum collector current against load requirements. Ensure the operating temperature range meets environmental conditions.

Part Context

The FOD814A3S belongs to the FOD814 series of 4-pin DIP phototransistor optocouplers manufactured by onsemi. This series is characterized by its ability to handle AC inputs directly due to the back-to-back LED arrangement. It serves as a standard solution for general-purpose isolation in industrial and consumer electronics where moderate speed and high reliability are prioritized over ultra-high bandwidth.

Replacement Considerations

Public sources indicate that FOD814A3S is obsolete. Substitutes include FOD814A3SD and other variants within the FOD814 family. Verify pinout compatibility and electrical parameters such as CTR and isolation voltage when selecting an alternative.