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No Connect. (Leave unconnected or trace per manufacturer specifications). Pin 4 (GND): Ground for the output IC. Pin 5 (Output): The logic output pin. Pin 6 ( VCCcap V sub cap C cap C end-sub ): Output side power supply. Pin 7 (NC): No Connect.
– The emitter terminal of the output phototransistor. Typically connected to the output ground in common-emitter configurations.
| If you need... | Buy this part number... | Key Datasheet spec | | :--- | :--- | :--- | | General purpose, cheap, DC switching | (DIP-4, smaller) | CTR 50-600%, VISO 5kV | | Robust, high isolation, classic | 4N35 (DIP-6) | CTR 100%, VISO 2.5kV | | High voltage (up to 70V) output | 4N36 | VCEO 70V | | AC input detection | H11AA1 | Contains two back-to-back LEDs | | Fast digital communication (1Mbps) | 6N137 | Logic output, 10ns propagation delay | | TRIAC driver for AC mains | MOC3021 | Zero-cross or random phase | 1458 optocoupler datasheet
The (often referred to simply as the 1458 optocoupler ) is a high-speed, hermetically sealed logic gate optocoupler primarily manufactured by Broadcom (formerly Avago) . It is specifically engineered for high-reliability applications, including industrial, aerospace, and medical systems where signal integrity and electrical isolation are critical. Key Specifications and Performance
range of 3.0V to 5.5V, making it ideal for battery-powered or low-voltage systems. No Connect
Ensure sufficient physical distance on your PCB between the input and output traces. This preserves the high-voltage isolation rating of the component.
Protecting sensitive digital controllers from high-voltage noise in industrial machinery. Pin 5 (Output): The logic output pin
Used to isolate sensitive computer circuits from peripheral equipment. Summary Table: Key Specifications Value (Typical) Operating Voltage VCCcap V sub cap C cap C end-sub 3.0 V - 5.5 V Propagation Delay 35 ns (10 kHz) Common Mode Immunity Input Logic TTL/CMOS Compatible Output Type Open Collector Package Conclusion
Optocouplers are the watchdogs of mixed-voltage electronics. Treat them with respect, read their datasheets religiously, and your circuits will remain safe, stable, and silent. Happy isolating.
