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FOD2743B
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Product Detailed Parameters
- Description：OPTOISOLATOR 5KV 1CH TRANS 8-DIP
- 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：Through Hole
- Package / Case：8-DIP (0.300", 7.62mm)
- Supplier Device Package：8-DIP
- Grade：-
- Qualification：-
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Overview
The FOD2743B is an optically isolated error amplifier comprising a precision programmable shunt reference and a transistor output optocoupler. It features a single channel with NPN phototransistor output in an 8-pin DIP package. Key electrical parameters include a minimum collector-emitter breakdown voltage of 70 V, a nominal current transfer ratio of 50%, and a maximum dark supply current of 50 nA. The device supports a maximum forward current of 20 mA with a forward voltage of 1.2 V. It provides 5000 Vrms isolation voltage and operates within a temperature range of -40°C to +85°C.
Feature Summary
- Integrates a KA431 precision programmable shunt reference with an optocoupler for closed-loop control applications
- Provides high-voltage electrical isolation between input and output circuits
- Offers stable error amplification characteristics suitable for feedback loops
Applications
- Switch-mode power supply (SMPS) primary-side regulation
- Flyback converter feedback circuits
- Battery charger control systems
Procurement Notes
Verify the manufacturer origin, as Fairchild Semiconductor's semiconductor division is now part of onsemi. Confirm the specific suffix indicates the correct package type (DIP-8) and lead spacing. Ensure compliance with RoHS standards and check for UL or VDE approvals if required by your design specifications. Validate that the component matches the exact pinout and electrical ratings needed for your circuit.
Selection Notes
Select this component when a combined error amplifier and optocoupler solution is required to reduce component count and board space. It is suitable for designs needing precise voltage referencing with galvanic isolation. Consider the 50% CTR and 70V breakdown voltage limits to ensure adequate noise margin and reliability in your specific operating conditions compared to other variants in the series.
Part Context
The FOD2743B belongs to the FOD274x family of optically isolated error amplifiers manufactured by Fairchild Semiconductor. This family integrates a shunt reference with an optocoupler to simplify feedback loop design in isolated power converters. The B variant specifically denotes the standard current transfer ratio configuration within this product line.
Replacement Considerations
Check for equivalents from onsemi, which acquired Fairchild's semiconductor business. Verify pin compatibility and electrical parameter alignment before substitution.
