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FOD2743BS
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Product Detailed Parameters
- Description：OPTOISOLATOR 5KV 1CH TRANS 8-SMD
- Series：-
- Mfr：Fairchild Semiconductor
- Package：Bulk
- 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：Surface Mount
- Package / Case：8-SMD, Gull Wing
- Supplier Device Package：8-SMD
- Grade：-
- Qualification：-
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Overview
The FOD2743BS is a transistor output optocoupler featuring an integrated error amplifier coupler. It provides high isolation with a maximum insulation voltage of 5000 Vrms. The device operates within a temperature range of -40°C to +85°C and utilizes an SMD-DIP-8 package. Key electrical parameters include a minimum current transfer ratio of 50% at 1mA, a maximum forward current of 20 mA, and a typical forward voltage of 1.07V. The collector-emitter breakdown voltage is rated at a minimum of 70V, ensuring reliable performance in isolated feedback applications.
Feature Summary
- Integrates a precision programmable shunt reference with an optocoupler for error amplification
- Provides robust galvanic isolation between input and output circuits
- Designed for surface mount assembly in compact electronic systems
Applications
- Switching power supply feedback loops
- Isolated error amplifier circuits
- Flyback converter control systems
Procurement Notes
Verify the manufacturer designation as Fairchild Semiconductor or onsemi, noting that Fairchild's semiconductor division was acquired by onsemi. Confirm the specific suffix 'BS' corresponds to the SMD-DIP-8 package variant. Ensure compliance with RoHS standards and check for any obsolescence notices from the current manufacturer, as component availability may vary based on production lifecycle status.
Selection Notes
Select this component when a combined error amplifier and isolation stage is required in a single package. The 5000 Vrms isolation rating suits high-voltage primary-to-secondary feedback paths. Consider the SMD-DIP-8 footprint for PCB layout compatibility. Verify that the 50% minimum CTR meets the drive requirements of the downstream controller circuit under all operating temperature conditions.
Part Context
This part belongs to the FOD2743 series of optically isolated amplifiers. The series typically combines a reference element with a phototransistor output to simplify isolated feedback designs. Variants such as FOD2743A, B, and C differ primarily in packaging and specific electrical tolerances. The FOD2743BS specifically denotes the surface-mount DIP configuration offered by the manufacturer.
Replacement Considerations
- FOD2743CS
FAQ
What is the function of the internal reference in the FOD2743BS?
The device integrates a precision programmable shunt reference (similar to KA431) that works with the optocoupler to form an error amplifier, allowing for accurate voltage regulation across the isolation barrier.
What is the maximum isolation voltage rating?
The FOD2743BS supports a maximum insulation voltage of 5000 Vrms, providing significant separation between the primary and secondary sides of the circuit.
