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FODM121G
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Product Detailed Parameters
- Description：OPTOISO 3.75KV 1CH TRANS 4-SMD
- Series：-
- Mfr：onsemi
- Package：Box
- Number of Channels：1
- Voltage - Isolation：3750Vrms
- Current Transfer Ratio (Min)：50% @ 5mA
- Current Transfer Ratio (Max)：600% @ 5mA
- Turn On / Turn Off Time (Typ)：-
- Rise / Fall Time (Typ)：3µs, 3µs
- Input Type：DC
- Output Type：Transistor
- Voltage - Output (Max)：80V
- Current - Output / Channel：80mA
- Voltage - Forward (Vf) (Typ)：1.3V (Max)
- Current - DC Forward (If) (Max)：50 mA
- Vce Saturation (Max)：400mV
- Operating Temperature：-40°C ~ 110°C
- Mounting Type：Surface Mount
- Package / Case：4-SMD, Gull Wing
- Supplier Device Package：4-SMD
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Overview
The FODM121G is a single-channel transistor output optoisolator manufactured by onsemi. It features a gallium arsenide infrared LED coupled to an NPN silicon phototransistor in a compact 4-SMD gull-wing package. The device provides 3750Vrms isolation voltage and supports a maximum collector current of 80mA with a typical CTR range of 100% to 600% at 5mA forward current. Operating temperature spans -40°C to 110°C, ensuring reliability in industrial environments.
Feature Summary
- High isolation voltage capability for safe signal transmission between isolated circuits
- Compact surface-mount packaging suitable for space-constrained designs
- Wide operating temperature range for robust performance in harsh conditions
Applications
- Industrial automation control systems
- Power supply feedback loops
- Signal isolation in microcontroller interfaces
Procurement Notes
Verify component status as the FODM121G may be obsolete or discontinued. Confirm availability through authorized distributors only. Check for valid RoHS compliance documentation and ensure the supplier provides genuine parts with traceable manufacturing dates to avoid counterfeit risks during procurement.
Selection Notes
Select this component when high isolation voltage and compact SMD form factor are required. Ensure the application demands transistor output characteristics rather than logic or SCR outputs. Verify that the 80mA collector current rating meets load requirements and that the 3750Vrms isolation level satisfies safety standards for the specific circuit design.
Part Context
This part belongs to onsemi's family of transistor output optocouplers, designed for general-purpose isolation tasks. It shares functional similarities with other models like FODM121A but differs in packaging and specific electrical tolerances. The series emphasizes reliability and cost-effectiveness for standard isolation applications in consumer and industrial electronics.
Replacement Considerations
FODM121R2 is listed as a similar substitute option. Verify pin compatibility and electrical specifications before substitution. Ensure the replacement maintains equivalent isolation voltage and current transfer ratio requirements for the target application.
