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FOD785B
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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)：130% @ 5mA
- Current Transfer Ratio (Max)：260% @ 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 FOD785B is a single-channel transistor output optocoupler manufactured by onsemi. It features an NPN phototransistor output and provides 5000 Vrms insulation voltage. The device operates with a maximum collector-emitter voltage of 80 V and a maximum collector current of 50 mA. Current transfer ratio ranges from 80% to 160%. Forward voltage is 1.4 V at 50 mA forward current. Rise and fall times are typically 18 µs. Power dissipation is 100 mW. Operating temperature range spans from -55°C to +110°C.
Feature Summary
- Provides electrical isolation between input and output circuits using infrared LED and NPN phototransistor technology.
- Offers high insulation voltage capability for safe signal transmission across potential differences.
- Designed for general-purpose switching applications with fast response times.
Applications
- General-purpose signal isolation in industrial control systems
- Power supply feedback loops
- Microcontroller interface circuits
Procurement Notes
Verify the specific suffix (e.g., B) matches design requirements for current transfer ratio tolerance. Confirm package type (DIP-4) and reel/cut-tape availability align with assembly processes. Check RoHS compliance status and lead times due to reported long delivery periods. Ensure operating temperature range meets system environmental specifications.
Selection Notes
Select based on required isolation voltage and current transfer ratio accuracy. Compare rise/fall times against signal speed needs. Consider thermal management for power dissipation limits. Evaluate package compatibility with PCB layout constraints.
Part Context
Part of the FOD785 series, which includes variants like FOD785A, FOD785C, and FOD785ASD. These share similar core specifications but differ in CTR bins or packaging formats. The series targets cost-effective isolation solutions for standard digital and analog signal coupling tasks.
Replacement Considerations
FOD785A and FOD785C are direct functional equivalents within the same series, differing primarily in CTR binning. Verify pinout and package dimensions match before substitution. No other public substitute part numbers are confirmed.
