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FODM121B
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Product Detailed Parameters
- Description：OPTOISO 3.75KV 1CH TRANS 4-SMD
- Series：-
- Mfr：onsemi
- Package：Tube
- Number of Channels：1
- Voltage - Isolation：3750Vrms
- Current Transfer Ratio (Min)：50% @ 5mA
- Current Transfer Ratio (Max)：150% @ 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
- Grade：-
- Qualification：-
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Overview
The onsemi FODM121B is a single-channel transistor output optocoupler featuring an aluminum gallium arsenide infrared LED coupled to an NPN phototransistor. It utilizes a compact 4-pin Mini Flat Package (MFP) surface-mount design. The device provides a high isolation voltage of 3750Vrms and supports a maximum DC forward current of 50mA. Typical rise and fall times are 3µs, with a collector-emitter saturation voltage of 400mV max. It operates within a temperature range of -40°C to 110°C.
Feature Summary
- Compact 4-pin Mini Flat Package (MFP) for space-constrained surface-mount applications
- High isolation voltage capability of 3750Vrms for robust circuit protection
- Fast switching performance with typical 3µs rise and fall times
- Wide operating temperature range suitable for industrial environments
Applications
- General-purpose signal isolation in industrial control systems
- Interface between microcontrollers and power circuits
- Signal transmission in noisy electrical environments
Procurement Notes
Verify the specific suffix variant, as the FODM121B designation may correspond to discontinued or legacy stock depending on the distributor. Confirm package type and lead times carefully, as availability varies significantly across suppliers. Cross-reference datasheets to ensure compatibility with current design requirements before procurement.
Selection Notes
Select this component when a small footprint and high isolation are required for low-speed digital signal transmission. Ensure the application does not exceed the 50mA forward current limit. Verify that the 3µs switching speed meets the system timing requirements. Consider alternative active parts if long-term supply stability is critical.
Part Context
The FODM121B belongs to onsemi's family of transistor output optocouplers, which includes models like the FODM121AR2V and FODM2705. These devices share similar core technologies but differ in packaging and specific electrical characteristics. This series is designed for general-purpose isolation tasks requiring reliable performance in compact form factors.
Replacement Considerations
Publicly confirmed substitute part numbers are not available in the provided documentation. Users should consult official manufacturer resources for qualified replacements.
