| Rank | CTR (at IF=5mA, VCE=5V) | | :--- | :--- | | A1458-A | 50% - 150% | | A1458-B | 100% - 300% | | A1458-C | 200% - 600% | The CTR degrades with temperature and age. A typical rule of thumb is to derate the CTR by 50% after 10 years of continuous operation at 50°C. 3. Switching Characteristics (Typical at VCE = 5V, IC = 2mA) | Parameter | Symbol | Typical Value | Unit | | :--- | :--- | :--- | :--- | | Rise Time | tr | 4 | µs | | Fall Time | tf | 3 | µs | | Turn-on Time | ton | 5 | µs | | Turn-off Time | toff | 4 | µs |
Introduction In the world of electronics, galvanic isolation is a critical requirement for safety, noise immunity, and signal integrity. Optocouplers (also known as opto-isolators) are the backbone of this technology. Among the myriad of components available, the A1458 optocoupler stands out for its specific balance of speed, current transfer ratio, and isolation voltage. a1458 optocoupler datasheet