: A similar high-speed optocoupler designed for digital logic grounding. A common 10 MBd high-speed optocoupler. The
(Voltage Output Low): The maximum voltage measured at the output pin when the optocoupler is in a logic "LOW" state. VOHcap V sub cap O cap H end-sub
The datasheet will list typical applications, but understanding why the HCPL-1458 is a good fit is key.
Disclaimer: Always compare the side-by-side with the datasheet of any potential replacement to ensure it fits your specific voltage, speed, and current requirements. Summary of Best Practices
How do you actually use this? Here is a classic example of interfacing a 5V microcontroller with a 12V load. 1458 optocoupler datasheet
| Parameter | Min | Typ | Max | Unit | |-----------|-----|-----|-----|------| | Input forward current | 1 | 10 | 20 | mA | | Supply voltage (output) | - | 5 | 24 | V | | Collector load resistance | 1 | 10 | 100 | kΩ | | Ambient temperature | -25 | 25 | 85 | °C |
Typically ranges from 20% to 100% or higher, depending on the specific manufacturing bin and test current ( Collector-Emitter Saturation Voltage [
A common use case for the 1458 optocoupler is isolating a 3.3V or 5V MCU from a noisy industrial subsystem (like a 12V or 24V relay control matrix).
): -0.5 V to 15 V or 30 V (Check specific manufacturer suffix) -0.5 V to VCCcap V sub cap C cap C end-sub 4. Electrical Characteristics : A similar high-speed optocoupler designed for digital
The "1458" optocoupler (assumed common through-hole transistor-output optocoupler family; e.g., generic PC817-like single-channel phototransistor optocoupler) provides electrical isolation between input (LED) and output (phototransistor). Typical use cases: microcontroller isolation, signal level shifting, noise suppression, and protecting low-voltage logic from high-voltage circuits.
If the HCPL-1458 is unavailable, designers can consider the following similar products: Go to product viewer dialog for this item.
): Operates within a range of , making it compatible with standard TTL and CMOS logic levels.
R1=5−1.40.010=360Ωcap R sub 1 equals the fraction with numerator 5 minus 1.4 and denominator 0.010 end-fraction equals 360 space cap omega Circuit 2: Dual-Channel Isolated RS-232/TTL Communication VOHcap V sub cap O cap H end-sub
: High-speed digital signal switching and line receivers.
– Connects to the positive side of the input signal via a current-limiting resistor to drive the internal IR LED.
ceramic bypass capacitor as close as possible between Pin 5 (GND) and Pin 8 ( VCCcap V sub cap C cap C end-sub ) to stabilize the high-speed output stage. Technical Specifications & Absolute Maximum Ratings