FOD814ASD

Overview

The FOD814ASD is a single-channel transistor output optocoupler from onsemi, featuring a surface-mount 4-SMD package. It integrates two inverse-parallel gallium arsenide infrared LEDs driving a silicon phototransistor for AC/DC input compatibility. Key electrical parameters include a 5000Vrms isolation voltage, 70V collector-emitter voltage, and 50mA maximum collector current. The device exhibits a current transfer ratio of 50% to 150%, with typical rise/fall times of 4µs/3µs. Operating temperature ranges from -55°C to 105°C.

Feature Summary

• Dual LED Input Architecture: Incorporates two gallium arsenide infrared emitting diodes connected in inverse parallel to enable reliable operation with both AC and DC input signals without external rectification.
• High Voltage Isolation: Provides robust electrical isolation between input and output circuits with a rated insulation voltage of 5000Vrms, ensuring safety in high-voltage environments.
• Wide Operating Temperature Range: Designed for stable performance across an extended industrial temperature range from -55°C to 105°C, suitable for demanding thermal conditions.

Applications

• Industrial control systems requiring galvanic isolation
• AC/DC signal interface circuits
• Solid-state relay driver applications
• Power supply feedback loops

Procurement Notes

Verify the specific suffix 'ASD' corresponds to the 4-SMD鸥翼 (gull-wing) surface mount package configuration. Confirm that the required isolation voltage rating of 5000Vrms meets the safety standards of the target application. Ensure the operating temperature range up to 105°C aligns with the thermal design of the final assembly. Check RoHS compliance status if restricted substances are a constraint.

Selection Notes

Select this component when AC input detection is required without external diodes, leveraging the dual-LED structure. Choose the SMD package for automated assembly processes. Consider the 5000Vrms isolation for high-noise or high-voltage separation needs. Evaluate the 50mA collector current capability against load requirements. Verify that the 4-SMD footprint fits the PCB layout constraints compared to DIP alternatives.

Part Context

The FOD814ASD belongs to the FOD814 series of transistor output optocouplers manufactured by onsemi. This series is characterized by its ability to handle AC inputs directly due to the internal dual-LED configuration. It serves as a compact alternative to through-hole packages like the FOD814, offering similar electrical performance in a surface-mount form factor suitable for modern electronics manufacturing.

Replacement Considerations

Direct substitutes may include other FOD814 series variants with different packaging, such as DIP versions, provided the pinout and electrical specifications match. Cross-reference with generic transistor output optocouplers having dual-LED inputs and comparable isolation ratings, ensuring package dimensions and thermal characteristics are compatible.