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IS121 is listed in the Transistor, Photovoltaic Output Optoisolators range at ChipApex. The manufacturer field lists Isocom Components 2004 LTD. Its product description is OPTOISO 3.75KV 1CH TRANS 4-SMD. Review the specifications below when checking this part for your BOM.
The IS121 is a single-channel optocoupler featuring an infrared LED coupled to an NPN silicon phototransistor. It provides 3750Vrms isolation voltage and operates within a temperature range of -55°C to 125°C. The device supports a maximum forward current of 50mA and offers a typical current transfer ratio of 50%. Packaged in a Mini-Flat 4-pin SMD configuration, it is designed for space-efficient circuit isolation applications.
Verify the specific suffix codes against official Isocom Components documentation to ensure correct pinout and package variant compatibility. Confirm RoHS compliance status and hermetic sealing requirements if applicable to your design specifications before finalizing procurement orders.
Select this component when high isolation voltage is required in a small footprint. Ensure the input drive current does not exceed the maximum rating. Verify that the output load matches the phototransistor's collector-emitter characteristics for reliable switching performance.
Isocom Components specializes in infrared optoelectronic devices, offering alternatives to standard industry optocouplers. The IS121 belongs to their transistor output series, designed for general-purpose isolation where compact size and robust performance are critical factors in electronic system design.
Consult official substitution lists for direct equivalents. Ensure any replacement maintains the same isolation voltage, pin configuration, and thermal characteristics to guarantee circuit compatibility without redesign.
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