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Product Detailed Parameters
- Description：IC OFFLINE SWITCH FLYBACK 8DIP
- Series：-
- Mfr：Fremont Micro Devices Ltd
- Package：Tube
- Output Isolation：Isolated
- Internal Switch(s)：Yes
- Voltage - Breakdown：650V
- Topology：Flyback
- Voltage - Start Up：15.5 V
- Voltage - Supply (Vcc/Vdd)：6V ~ 30V
- Duty Cycle：-
- Frequency - Switching：-
- Fault Protection：Current Limiting, Open Loop, Over Temperature, Over Voltage
- Control Features：-
- Operating Temperature：-40°C ~ 150°C (TJ)
- Package / Case：8-DIP (0.300", 7.62mm)
- Supplier Device Package：8-DIP
- Mounting Type：Through Hole
- Grade：-
- Qualification：-
- Power (Watts)：-
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Overview
The FT838MBD-RB is an offline flyback switch from Fremont Micro Devices Ltd, packaged in an 8-DIP (0.300 inch) through-hole configuration. It features a built-in power NPN switch with a 650V breakdown voltage and operates within a Vcc range of 6V to 30V. The device initiates at a startup voltage of 15.5V and supports a junction temperature range of -40°C to 150°C. It incorporates comprehensive fault protection mechanisms including current limiting, open-loop detection, over-temperature shutdown, and over-voltage protection.
Feature Summary
- Primary-side control architecture eliminates the need for opto-couplers and TL431 components
- Built-in cable compensation and line compensation for improved regulation
- Proprietary technology enables high efficiency and fast dynamic response
- Operates without audible noise across the entire operating range
Applications
- Adapters and chargers for cell 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 RB against the manufacturer datasheet to confirm package dimensions and pinout compatibility. Ensure the design accommodates the specified 650V breakdown rating and 150°C maximum junction temperature. Confirm that the 8-DIP footprint matches the target PCB layout requirements before finalizing procurement.
Selection Notes
Select this component for designs requiring primary-side regulation to reduce bill of materials cost by removing isolation feedback elements. The wide operating temperature range suits industrial or automotive environments. Verify that the internal switch current handling meets the peak load requirements of the specific flyback transformer design.
Part Context
This part belongs to the FT838 family of low-power off-line CC/CV switches. The MB variant specifically denotes the 8-DIP package option, distinguishing it from surface-mount alternatives like the SOT23-5 or SOIC packages found in other family members such as the FT838D1-BL-RT or FT838RNA-RT.
Replacement Considerations
Cross-reference with FT838NB or FT838RNA if surface mount packaging is acceptable, noting the package change requires PCB redesign. Direct pin-to-pin replacements within the DIP format are not explicitly listed in public documentation; verify electrical equivalence with generic flyback controllers only after detailed parameter matching.
