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Product Detailed Parameters
- Description：IC OFFLINE SWITCH FLYBACK 8SOIC
- Series：-
- Mfr：Fremont Micro Devices Ltd
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Isolation：Isolated
- Internal Switch(s)：Yes
- Voltage - Breakdown：700V
- Topology：Flyback
- Voltage - Start Up：17.6 V
- Voltage - Supply (Vcc/Vdd)：6.6V ~ 30V
- Duty Cycle：-
- Frequency - Switching：-
- Fault Protection：Current Limiting, Open Circuit, Over Temperature, Over Voltage
- Control Features：-
- Operating Temperature：-40°C ~ 125°C (TA)
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：8-SOIC
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
- Power (Watts)：-
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Overview
The FT838RNA-RT is an offline flyback switch manufactured by Fremont Micro Devices Ltd, housed in an 8-SOIC package. It operates with a startup voltage of 17.6 V and a supply voltage range of 6.6V to 30V. The device features a 700V breakdown voltage and supports primary-side control for constant-current and constant-voltage regulation without optocouplers. It includes built-in cable and line compensation, cycle-by-cycle current limiting, over-temperature protection, open circuit protection, and VCC overvoltage protection. Operating temperatures range from -40°C to 125°C.
Feature Summary
- Primary-side control architecture eliminates the need for optocouplers and TL431 components.
- Integrated power NPN transistor and proprietary technology for high efficiency.
- Built-in cable and line compensation for accurate output regulation.
- Comprehensive protection mechanisms including over-temperature and open circuit detection.
Applications
- Adapters and chargers for portable devices such as cell phones and PDAs
- Standby and auxiliary power supplies
- Set-top boxes (STB)
- AC/DC LED driver applications
Procurement Notes
Verify the specific suffix RT indicates tape and reel packaging when ordering. Confirm RoHS3 compliance status for environmental requirements. Ensure the 8-SOIC footprint matches the target PCB design. Cross-reference the manufacturer part number FT838RNA-RT with official datasheets to confirm pinout and electrical characteristics before finalizing procurement specifications.
Selection Notes
Select this component for low-power offline AC/DC converters requiring primary-side regulation. The FT838RNA variant is suitable for LED drivers where slightly higher standby current is acceptable compared to the FT838NB version. Consider the integrated NPN switch and protection features to simplify external circuit design. Verify that the 700V breakdown voltage meets the peak drain stress requirements of the specific transformer design.
Part Context
This part belongs to the FT838 family of low-power off-line CC/CV switches. The FT838RNA specifically targets LED driver applications, while the FT838NB is optimized for general-purpose adapters. Both variants share the same SOP8 package and core control logic but differ in standby current performance. The family utilizes proprietary primary-side control technology to achieve high efficiency.
Replacement Considerations
The FT838NB is a related variant within the same family, offering similar functionality with different standby current characteristics. Verify compatibility regarding standby current requirements if substituting between RNA and NB versions. No other direct substitute part numbers are confirmed in public documentation.
