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Product Detailed Parameters
- Description：IC OFFLINE SW FLYBACK SOT23-5
- Series：-
- Mfr：Fremont Micro Devices Ltd
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Isolation：Isolated
- Internal Switch(s)：No
- Voltage - Breakdown：-
- 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：SC-74A, SOT-753
- Supplier Device Package：SOT-23-5
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
- Power (Watts)：18 W
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Overview
The FT838R-BL-RT is an offline flyback converter IC from Fremont Micro Devices Ltd, packaged in a SOT-23-5 surface-mount format. It operates with a startup voltage of 17.6 V and a supply voltage range of 6.6V to 30V. The device features an internal switch with a breakdown voltage of 700V. Protection mechanisms include cycle-by-cycle current limiting, over-temperature protection, open-circuit detection, and over-voltage protection. It supports isolated output configurations and functions within a junction temperature range of -40°C to 125°C.
Feature Summary
- Primary-side control architecture eliminates the need for opto-couplers and TL431 components.
- Built-in cable compensation and line compensation ensure stable performance.
- Optimized for high efficiency and fast dynamic response in constant-current and constant-voltage applications.
- Operates without audible noise across the entire operating range.
Applications
- Adapters and chargers for cell phones, cordless phones, PDAs, and MP3 players
- Standby and auxiliary power supplies
- Set-top boxes (STB)
- AC/DC LED driver applications
Procurement Notes
Verify the specific suffix BL-RT against the official datasheet to confirm package type and tape-and-reel specifications. Ensure compatibility with the required thermal management for the SOT-23-5 package. Confirm RoHS3 compliance status for your region. Check lead times due to potential supply constraints mentioned by distributors. Validate that the 700V breakdown rating meets your circuit requirements.
Selection Notes
Select this component for low-power offline AC/DC conversion where primary-side regulation is preferred. It is suitable for designs requiring compact SOT-23-5 footprints. Consider the 6.6V to 30V Vcc range for biasing circuit design. Ensure the application does not require secondary-side feedback isolation beyond the transformer. Evaluate thermal dissipation capabilities for the target environment.
Part Context
This part belongs to the FT838 family of low-power off-line CC/CV switches. It shares core controller technology with variants like the FT838NB and FT838RNA but differs in packaging. The R-BL-RT designation indicates the SOT-23-5 surface-mount configuration. It is designed for cost-sensitive applications eliminating secondary feedback components.
Replacement Considerations
Direct substitutes include other FT838 family members such as FT838NB or FT838RNA, provided the package difference is acceptable. Verify pinout compatibility when switching between DIP and SOT-23 packages. Cross-reference electrical parameters like startup voltage and breakdown voltage to ensure circuit integrity.
