When you locate the official datasheet, pay special attention to:
Since we are treating "1458" as a placeholder, let us dissect the datasheet of the , one of the most common, general-purpose optocouplers available. If you find a component labeled "1458" in an isolation slot, its electrical characteristics will likely mirror this family.
A higher CTR ensures that a low-power control signal can effectively drive the output transistor into saturation. Switching Speeds 0.2 Propagation Delay Time to Low Output ( tPHLt sub cap P cap H cap L end-sub ): 0.2
Engineers turn to the HCPL-1458 technical specifications when standard phototransistor couplers lack the speed or low-voltage efficiency required for modern microcontrollers. Specification Value Key Benefit 3.0 V to 5.5 V Direct compatibility with 3.3V and 5V logic. Propagation Delay 35 ns (typical at 10 kHz) Enables high-bit-rate data transmission. Isolation Rating VRMScap V sub cap R cap M cap S end-sub (1 Minute) Heavy-duty protection against spikes. Package Type SOP-8 (Small Outline) Ideal for high-density, space-constrained PCBs. Output Type Open Collector / Logic Gate Flexible level shifting with external pull-ups. Pinout Configuration and Package Details 1458 optocoupler datasheet
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Positive terminal of the input Gallium Arsenide Phosphide (GaAsP) LED. Pin 2 (Cathode): Negative terminal of the input LED.
Standard Dual-Channel (DIP-8) Pinout +---_---+ Anode 1 | 1 8 | Collector 2 Cathode 1 | 2 7 | Emitter 2 Anode 2 | 3 6 | Collector 1 Cathode 2 | 4 5 | Emitter 1 +-------+ Pin Descriptions When you locate the official datasheet, pay special
A photosensitive integrated photodetector (often a phototransistor or logic gate) that detects the light and converts it back into an electrical signal.
The HCPL-1458 is typically housed in an or DIP-8 package. While specific internal diagrams vary by variant, a standard high-speed 8-pin optocoupler often follows this general layout:
CTR is not linear across all current ranges. It typically peaks between 10 mA and 20 mA of forward current and drops off significantly below 1 mA. Application Circuit Design 1. Digital Logic Isolation (Microcontroller Interface) Switching Speeds 0
According to the , the component boasts several standout characteristics:
(Voltage Output High): The minimum voltage measured at the output when the component is in a logic "HIGH" state. 4. Isolation Voltage ( VISOcap V sub cap I cap S cap O end-sub