With a maximum input current consumption ( ICCcap I sub cap C cap C end-sub
: Typically supports data rates up to 10–15 MBd .
: The output of the HCPL-1458 is an open-collector transistor, meaning it can only sink current to ground. It cannot source current. Therefore, you must always connect a pull-up resistor from the output pin (Vo) to your positive logic supply voltage (VCC). The value of this resistor determines the rise time of the output signal (lower resistor = faster speed but higher power consumption).
One of the standout features of the A1458 is its high noise immunity, boasting a CMR of 50 kV/μs minimum. This makes it highly resistant to transient noise in industrial environments. a1458 optocoupler datasheet
Ensures that TTL/CMOS logic signals are not disrupted by ground loops or noise.
Provides high immunity to transient voltage spikes and electrical noise.
The high-speed and high-isolation capabilities of the A1458 optocoupler make it a perfect fit for a wide range of circuits. Its datasheet will often include example application schematics. Here are several common uses: With a maximum input current consumption ( ICCcap
This component is highly regarded for its ability to bridge the gap between low-voltage control logic and high-voltage power stages while maintaining signal integrity.
In a standard 8-pin DIP or SOIC-8 package, the A1458 optocoupler typically follows this pin configuration:
When a forward current (IF) is applied to the input LED (Anode to Cathode), it emits infrared light. This light crosses the isolation barrier and strikes the photodetector, which activates the output transistor, pulling the output voltage (VO) low. When the input current stops, the output transistor turns off, and the output is pulled high via an external pull-up resistor. Therefore, you must always connect a pull-up resistor
| Rank | CTR (at IF=5mA, VCE=5V) | | :--- | :--- | | A1458-A | 50% - 150% | | A1458-B | 100% - 300% | | A1458-C | 200% - 600% |
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The is a high-performance, high-speed optically coupled isolator used extensively in industrial and consumer electronics. In the electronics industry, the part number "A1458" is shorthand for a family of components, primarily referencing the Avago (now Broadcom) HCPL-A1458 and HCPL-1458 series.