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FODM121E
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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 FODM121E is a single-channel transistor output optocoupler manufactured by Fairchild Semiconductor. It integrates a gallium arsenide infrared emitting diode with a phototransistor in a compact 4-pin Mini-Flat surface mount package. Key electrical specifications include a maximum collector-emitter breakdown voltage of 80 V, a typical current transfer ratio of 150%, and a maximum forward current of 50 mA. The device supports an operating temperature range from -40 °C to 100 °C and offers high isolation with a maximum insulation voltage of 3750 Vrms.
Feature Summary
- Compact 4-pin full pitch Mini-Flat surface mount package design
- High isolation capability exceeding 5mm creepage and clearance distances
- UL recognized and VDE approved for safety 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 against official Fairchild documentation to confirm exact binning or packaging variations. Ensure the component meets RoHS compliance requirements as indicated in the datasheet. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components. Confirm that the Mini-Flat package dimensions align with your PCB footprint specifications before finalizing procurement orders.
Selection Notes
Select this component when a compact surface mount solution is required for digital signal isolation. The 4-pin Mini-Flat package is suitable for space-constrained designs. Consider the 150% typical current transfer ratio for standard logic interface applications. Verify that the 80V collector-emitter voltage rating meets the load requirements of the receiving circuit side.
Part Context
This device belongs to the FODM121 Series, which includes related models such as the FODM124, FODM2701, and FODM2705. These components share the same 4-pin Mini-Flat package form factor but may differ in current transfer ratio groups or specific electrical characteristics. The series is designed for general-purpose isolation tasks requiring small footprint and high reliability.
Replacement Considerations
Check for direct equivalents within the FODM121 Series family, such as the FODM124, ensuring pinout compatibility. Verify that any substitute maintains the same 4-pin Mini-Flat package and isolation voltage ratings. Consult official substitution guides from Fairchild Semiconductor for validated replacements.
