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FODM121GR4
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Product Detailed Parameters
- Description：OPTOISO 3.75KV 1CH TRANS 4-SMD
- Series：-
- Mfr：onsemi
- Package：Tape & Reel (TR),Cut Tape (CT)
- 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 FODM121GR4 is a single-channel transistor output optocoupler from onsemi, designed for general-purpose isolation applications. It features a 3750Vrms isolation voltage and operates within a temperature range of -40°C to +110°C. The device utilizes an NPN phototransistor output with a maximum collector-emitter voltage of 80V and a collector current of 80mA. Key electrical parameters include a typical rise/fall time of 3µs, a forward voltage of 1.3V, and a saturation voltage of 400mV. The Current Transfer Ratio (CTR) ranges from 50% to 600% at a forward current of 5mA. It is supplied in a 4-SMD Miniflat-4 package.
Feature Summary
- Provides high-voltage electrical isolation between input and output circuits
- Features fast switching performance with typical 3µs rise and fall times
- Designed for wide operating temperature environments up to 110°C
Applications
- General-purpose signal isolation in industrial control systems
- Power supply feedback loops for voltage regulation
- Microcontroller interface circuits requiring galvanic isolation
Procurement Notes
Verify the specific suffix GR4 indicates the reel packaging format when sourcing components. Confirm RoHS compliance status through official manufacturer declarations or datasheets prior to integration. Ensure the selected variant matches the required CTR specifications for the target application circuit design.
Selection Notes
Select this component when a compact surface-mount solution with moderate speed and high isolation voltage is required. Consider the 4-SMD footprint constraints and the NPN output configuration compatibility with downstream logic levels. Evaluate the CTR range against the driving capability of the input LED source.
Part Context
This part belongs to onsemi’s family of transistor output optocouplers, which are widely used for basic signal transmission across isolated boundaries. The FODM121 series offers a balance of performance and cost-effectiveness for standard isolation needs compared to higher-speed digital isolators.
Replacement Considerations
Check for direct pin-compatible substitutes such as the FODM121A or other single-channel transistor output optocouplers with matching 3750Vrms isolation and similar CTR ranges. Verify package dimensions and thermal characteristics before substitution.
