In long-distance data communication lines, ground potential differences between nodes can create massive ground loop currents.
The component arrives across multiple surface-mount and through-hole packaging form-factors:
The A1458 is a popular part, and sometimes, a direct replacement or a functionally equivalent part is needed. The following models are often mentioned as equivalents or alternatives. with your specific circuit before substitution.
The output collector current ( ICcap I sub cap C ) depends on the CTR. Assuming a conservative CTR of 100%:
—which reduces the drive power needed from the control circuit. TTL Compatibility a1458 optocoupler datasheet
: No internal electrical connection. Leave isolated on the PCB layout.
As one engineering analysis notes, "HCPL-1458 is stronger, with higher CTR and shorter response time, suitable for switching power supply feedback, digital signal isolation, and other scenarios with certain speed requirements. HCNW1458 is a ‘low-key powerhouse’! High withstand voltage, fast response, and good temperature stability, especially suitable for industrial control in high-temperature environments".
: Compact 8-pin surface-mount footprints optimized for high-density automated PCB pick-and-place lines.
Optimized for data processing speeds up to 10 MBd (MegaBaud) . with your specific circuit before substitution
Top-Down View (DIP-8 / SOP-8) +--- ---+ Anode | 1 8 | VCC (Supply Voltage) Cathode | 2 7 | No Connection (NC) NC | 3 6 | VO (Signal Output) NC | 4 5 | GND (Ground Connection) +-------+
Ground loop breaking for RS-232, RS-485, and CAN bus lines. Medical Equipment: High voltage isolation. 6. Summary
| Pin Number | Name | Function | | :--- | :--- | :--- | | 1 | NC | No Connect | | 2 | ANODE | Anode (+) of the input LED | | 3 | CATHODE | Cathode (-) of the input LED | | 4 | NC | No Connect | | 5 | GND | Ground connection for the output side | | 6 | VO | Output Voltage (open-collector output) | | 7 | VCC | Positive supply voltage for the output side | | 8 | GND | Ground connection for the output side |
) is a high-speed, single-channel optocoupler designed for isolation in high-performance switching applications. It is typically manufactured by Broadcom (formerly Avago Technologies). TTL Compatibility : No internal electrical connection
TOP VIEW (SOP-8 / DIP-8) +---------\_/---------+ Pin 1 | [•] Anode VCC | Pin 8 Pin 2 | Cathode VO | Pin 7 (Output Signal) Pin 3 | NC NC | Pin 6 Pin 4 | NC GND | Pin 5 +---------------------+ Pin Description Table Single Channel, High Speed Optocouplers Technical Data
The separates high-voltage input lines from low-voltage outputs using an internal short optical path. An AlGaAs infrared light-emitting diode (LED) converts electrical inputs to optical signals, which cross an internal insulating layer to strike an integrated, high-gain photodetector gate. Pin Number Description / Functional Role Pin 1 No Internal Connection (Maintains Creepage Distance) Pin 2 Positive Input for the Transmitting LED Pin 3 Negative Input for the Transmitting LED Pin 4 No Internal Connection Pin 5 Ground Reference for the Output Stage Pin 6 VOUTcap V sub cap O cap U cap T end-sub Open-Collector/Logic Gate Signal Output Pin 7 No Connection or Enable (Package Variant Dependent) Pin 8 VCCcap V sub cap C cap C end-sub
: Typically 20 ns, with a maximum of 35 ns at specific frequencies. Common Mode Rejection (CMR) : Minimum 15,000 V/μs. Electrical Characteristics Supply Voltage ( cap V sub cap C cap C end-sub