FOD817B

Overview

The FOD817B is a single-channel transistor output optocoupler manufactured by onsemi. It features an NPN phototransistor output and utilizes a through-hole PDIP-4 package. The device provides an isolation voltage of 5000 Vrms, ensuring robust electrical separation between input and output circuits. Key electrical parameters include a maximum collector-emitter voltage of 70 V and a maximum collector current of 50 mA. The typical rise and fall times are both 18 µs, supporting standard-speed digital signal transmission. The component operates within a temperature range of -55°C to +110°C.

Feature Summary

• Provides high-voltage electrical isolation via a 5000 Vrms dielectric barrier between the infrared LED input and NPN phototransistor output.
• Delivers reliable DC signal coupling with a guaranteed minimum current transfer ratio of 130% for consistent logic level interfacing.
• Features a standard four-pin through-hole configuration suitable for general-purpose circuit board mounting and prototyping.

Applications

• General-purpose digital signal isolation in industrial control systems
• Interfacing microcontrollers with high-voltage switching loads
• Power supply feedback loop isolation
• Solid-state relay driver circuits

Procurement Notes

Verify that the specific order matches the PDIP-4 through-hole package variant, as surface-mount versions exist under different suffixes. Confirm compliance requirements such as RoHS status and UL/VDE certification levels prior to finalizing procurement. Ensure the supplier provides official datasheets to validate the 130% minimum CTR specification against project requirements.

Selection Notes

Select this component when standard-speed isolation is sufficient for the application, as indicated by the 18 µs transition times. It is appropriate for designs requiring a 5000 Vrms isolation rating and NPN transistor output characteristics. Consider alternative models if higher speed or surface-mount packaging is required, as this part is optimized for through-hole assembly.

Part Context

This device belongs to the FOD817 series of transistor output optocouplers from onsemi. The series offers various current transfer ratio grades and packaging options to suit different design constraints. The FOD817B specifically represents a standard grade option within this family, balancing performance and cost for general electronic applications.

Replacement Considerations

Direct substitutes within the same series include FOD817A and FOD817C, which differ primarily in current transfer ratio specifications. Other manufacturers offer pin-compatible alternatives, but verification of isolation voltage and CTR ranges is necessary to ensure functional equivalence.