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FOD2743BT
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Product Detailed Parameters
- Description：OPTOISOLATOR 5KV 1CH TRANS 8-DIP
- Series：-
- Mfr：Fairchild Semiconductor
- Package：Tube
- Number of Channels：1
- Voltage - Isolation：5000Vrms
- Current Transfer Ratio (Min)：50% @ 1mA
- Current Transfer Ratio (Max)：100% @ 1mA
- Turn On / Turn Off Time (Typ)：-
- Rise / Fall Time (Typ)：-
- Input Type：DC
- Output Type：Transistor
- Voltage - Output (Max)：70V
- Current - Output / Channel：50mA
- Voltage - Forward (Vf) (Typ)：1.07V
- Current - DC Forward (If) (Max)：-
- Vce Saturation (Max)：400mV
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Through Hole
- Package / Case：8-DIP (0.400", 10.16mm)
- Supplier Device Package：8-DIP
- Grade：-
- Qualification：-
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Overview
The FOD2743BT is a transistor output optocoupler featuring an integrated error amplifier. It combines a high-gain phototransistor with a precision programmable shunt reference, specifically the KA431, to provide optical isolation for feedback loops. The device operates with a single channel and utilizes a DIP-8 package. Key electrical parameters include a minimum collector-emitter breakdown voltage of 70 V, a nominal current transfer ratio of 50%, and a maximum forward voltage of 1.2 V. It supports a maximum forward current of 20 mA and offers an insulation voltage of 5000 Vrms.
Feature Summary
- Integrates a precision programmable shunt reference with a high-gain phototransistor for closed-loop control applications
- Provides galvanic isolation between input and output circuits via optical transmission
- Designed for error amplification in power supply feedback networks
Applications
- Switching power supply feedback loops
- Flyback converter regulation
- Isolated error amplifier circuits
Procurement Notes
Verify component authenticity through official manufacturer channels or authorized distributors. Confirm RoHS compliance status and lead-free markings on the package. Check for UL and VDE approvals if safety certification is required for the end application. Ensure the specific suffix matches the desired packaging format.
Selection Notes
Select this component when an integrated error amplifier is needed within an isolated feedback path. Compare the 50% current transfer ratio against requirements for loop stability. Consider the 70 V collector-emitter voltage rating relative to the output stage. Evaluate the DIP-8 package constraints against PCB layout space.
Part Context
This part belongs to the FOD2743 series of optically isolated amplifiers manufactured by Fairchild Semiconductor, now part of onsemi. The series typically includes variants with different current transfer ratios and packaging options. These devices are designed to replace discrete error amplifier and optocoupler combinations, simplifying circuit design for isolated power conversion systems.
Replacement Considerations
Check datasheets for equivalent parts from other manufacturers offering similar integrated error amplifier functionality. Verify pin compatibility and electrical parameter alignment, particularly the current transfer ratio and isolation voltage ratings.
