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FODM121AR4
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Product Detailed Parameters
- Description：OPTOISO 3.75KV 1CH TRANS 4-SMD
- Series：-
- Mfr：onsemi
- Package：Tape & Reel (TR)
- Number of Channels：1
- Voltage - Isolation：3750Vrms
- Current Transfer Ratio (Min)：100% @ 5mA
- Current Transfer Ratio (Max)：300% @ 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 FODM121AR4 is a single-channel transistor output optoisolator manufactured by onsemi. It provides an isolation voltage of 3750Vrms and operates within a temperature range of -40°C to 110°C. The device features a maximum collector-emitter saturation voltage of 400mV and supports a load voltage of up to 80V. With a typical rise and fall time of 3µs, it ensures reliable signal transmission. The component is supplied in a 4-SMD Mini-Flat package with tape and reel packaging for automated assembly processes.
Feature Summary
- Provides high-voltage electrical isolation between input and output circuits
- Utilizes a phototransistor output configuration for digital signal switching
- Designed for surface-mount installation in compact electronic assemblies
Applications
- Industrial control systems requiring galvanic isolation
- Power supply feedback loops for voltage regulation
- Signal interfacing between microcontrollers and high-voltage loads
Procurement Notes
Verify the specific suffix 'R4' indicates tape and reel packaging when sourcing. Confirm that the obsolete status does not impact long-term availability requirements. Ensure compatibility with existing PCB footprints designed for the 4-SMD Mini-Flat package. Check for RoHS compliance documentation if environmental regulations apply to the final product assembly.
Selection Notes
Select this component when a low-cost, general-purpose optoisolator with moderate speed is required. The 400mV saturation voltage makes it suitable for driving logic inputs directly. Consider the 3750Vrms isolation rating for safety-critical applications. Evaluate the 3µs switching speed against system timing requirements before implementation.
Part Context
This part belongs to the FODM121 family of optoisolators from onsemi. It shares core electrical characteristics with the standard FODM121A but differs in packaging format. The R4 suffix specifically denotes the tape and reel variant intended for high-volume surface-mount manufacturing lines.
Replacement Considerations
The FODM121A is listed as a parametric equivalent substitute. Verify pinout compatibility and package dimensions before substitution. Ensure the replacement meets the same isolation voltage and current transfer ratio specifications.
