1458 Optocoupler Datasheet 'link'

The HCPL-1458 is an integrated opto-isolator that utilizes a short optical transmission path to transfer signals between two electrically isolated circuits. This isolation is critical for protecting sensitive low-voltage components, such as microcontrollers, from high-voltage spikes and reducing ground loop interference. Key Technical Specifications

  • Forward Voltage (VF): Usually 1.2V to 1.5V (typical for an IR LED). Your driving circuit must supply this.
  • Collector Dark Current (ICEO): Leakage current when the LED is off. This should be < 50nA at 25°C. High dark current ruins logic low levels.

If you try to send a 1 MHz signal through a standard 4N35, it will turn into a triangle wave. For fast communication, you need a high-speed optocoupler (like the 6N137), not a 1458 equivalent. 1458 optocoupler datasheet

Important Note

⚠️ : If you have a specific 1458 optocoupler from a known brand (e.g., Siemens SFH1458 or QT-Brightek QTLP1458), please refer to that manufacturer’s official datasheet, as parameters may differ significantly from the generic version above. The HCPL-1458 is an integrated opto-isolator that utilizes

1. General Description

For the 4N35 at I_F = 10mA, V_CE = 10V:

Part 6: Sourcing the "1458 Optocoupler" – A Practical Guide

2. Ground Loop Breaking

CTR grades usually include rank markings (e.g., Rank K: 80-160%, Rank D: 200-400%). Forward Voltage (VF): Usually 1

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