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FODM121F
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Product Detailed Parameters
- Description：OPTOISO 3.75KV 1CH TRANS 4-SMD
- Series：-
- Mfr：Fairchild Semiconductor
- 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
- Grade：-
- Qualification：-
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Overview
The FODM121F is a single-channel transistor output optocoupler housed in a 4-pin Mini-Flat surface-mount package. It features a collector-emitter breakdown voltage of 80V and an isolation voltage of 3750 Vrms. The device supports a maximum forward current of 50mA and offers a typical current transfer ratio of 150%. Operating temperatures range from -40°C to 100°C, with compliance to UL and VDE standards.
Feature Summary
- Compact 4-pin full pitch Mini-Flat surface mount package design
- High insulation voltage capability of 3750 Vrms for signal isolation
- Creepage and clearance distances exceeding 5mm for enhanced safety
- UL recognized and VDE approved for international regulatory compliance
Applications
- Digital logic input interfacing
- Microprocessor system inputs
- Power supply monitoring circuits
- Twisted pair line receivers
- Telephone line receiver applications
Procurement Notes
Verify the specific suffix 'F' indicates the tape-and-reel packaging variant distinct from bulk units. Confirm RoHS compliance status and lead-free terminal finish specifications against the latest manufacturer datasheet revision. Ensure the ordering part number matches the required package style and reel quantity for production integration.
Selection Notes
Select this component when high isolation voltage is required in a compact surface-mount footprint. The transistor output type suits digital switching applications rather than linear analog transmission. Verify that the 80V collector-emitter voltage rating exceeds the load requirements of the receiving circuitry within the specified temperature range.
Part Context
This device belongs to the FODM121 Series, which includes variants like the FODM124. These components are designed as general-purpose optocouplers utilizing a phototransistor output stage. The series emphasizes small form factor integration while maintaining robust electrical isolation characteristics suitable for industrial and consumer electronics environments.
Replacement Considerations
Direct substitutes include other Fairchild/ON Semiconductor parts within the same Mini-Flat family, such as the FODM124, provided pinout and electrical ratings align. Cross-manufacturer replacements require verification of isolation voltage, CTR ranges, and package dimensions to ensure mechanical and functional compatibility.
