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FOD785C
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Product Detailed Parameters
- Description：OPTOISOLTR 5KV 1CH TRANS 4-PDIP
- Series：-
- Mfr：onsemi
- Package：Tube
- Number of Channels：1
- Voltage - Isolation：5000Vrms
- Current Transfer Ratio (Min)：200% @ 5mA
- Current Transfer Ratio (Max)：400% @ 5mA
- Turn On / Turn Off Time (Typ)：-
- Rise / Fall Time (Typ)：18µs, 18µs (Max)
- Input Type：DC
- Output Type：Transistor
- Voltage - Output (Max)：80V
- Current - Output / Channel：50mA
- Voltage - Forward (Vf) (Typ)：1.2V
- Current - DC Forward (If) (Max)：50 mA
- Vce Saturation (Max)：200mV
- Operating Temperature：-55°C ~ 110°C
- Mounting Type：Through Hole
- Package / Case：4-DIP (0.300", 7.62mm)
- Supplier Device Package：4-PDIP
- Grade：-
- Qualification：-
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Overview
The FOD785C is a single-channel transistor output optocoupler manufactured by onsemi. It features an NPN phototransistor output with a maximum collector-emitter voltage of 80 V and a continuous collector current of 50 mA. The device provides high isolation capability with a rated insulation voltage of 5000 Vrms. It operates within a temperature range of -55°C to +110°C and utilizes a 4-pin DIP package.
Feature Summary
- Provides galvanic isolation between input and output circuits using an infrared LED and NPN phototransistor pair.
- Offers high dielectric strength with a 5000 Vrms insulation voltage rating for robust noise immunity.
- Designed for reliable operation across a wide industrial temperature range from -55°C to +110°C.
Applications
- General-purpose signal isolation in industrial control systems
- Power supply feedback loops for voltage regulation
- Microcontroller interface circuits requiring electrical isolation
Procurement Notes
Verify the specific suffix 'C' corresponds to the required Current Transfer Ratio (CTR) bin, as variants like 'A' or 'ASD' may differ in performance specifications. Confirm that the 4-pin DIP package aligns with the target PCB footprint and assembly method. Ensure the 5000 Vrms isolation rating meets the safety standards applicable to the end equipment design.
Selection Notes
Select this component when a standard NPN phototransistor output is sufficient for digital signal transmission. Consider alternative packages such as SMD if space constraints exist, noting that surface mount variants may have different thermal characteristics. Verify that the 80 V collector-emitter voltage is adequate for the load circuit requirements.
Part Context
The FOD785C belongs to the FOD785 series of transistor output optocouplers from onsemi. This family is designed for general-purpose isolation applications where moderate speed and high reliability are required. The part shares functional similarities with other industry-standard optocouplers but offers specific CTR bins defined by the suffix.
Replacement Considerations
Direct pin-compatible replacements include other single-channel NPN phototransistor optocouplers with similar isolation ratings. Verify that substitute parts meet the same 5000 Vrms insulation requirement and operate within the specified -55°C to +110°C temperature range.
