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1458 Optocoupler Datasheet 2021 -

The Ultimate Guide to the 1458 Optocoupler: Datasheet, Pinouts, and Application Insights

Introduction: Decoding the 1458 Optocoupler

In the world of electronics, isolation is paramount. Whether you are designing a switched-mode power supply (SMPS), a microcontroller interface for industrial machinery, or a safety circuit for a medical device, the need to separate high-voltage domains from low-voltage logic is non-negotiable. The unsung hero of this task is the optocoupler (also known as an optoisolator).

Input side: Connect microcontroller pin → 330Ω resistor → Pin 1 (Anode). Pin 2 (Cathode) → GND.
Output side: Pin 5 (Collector) → ( V_CC ) = 24V via 10kΩ pull-up → also to PLC input. Pin 4 (Emitter) → GND.
No external base connection (Pin 6 open).

Output

Example typical characteristics table (for design reference)

VF (IF = 20 mA): 1.2 V (typ)
CTR (IF = 1 mA, VCE = 5 V): 50% (typ)
VCEO: 70 V (max)
IC (max): 50 mA
VCE(sat) (IF = 20 mA, IC = 2 mA): 0.2 V

Pin 1: Anode
Pin 2: Cathode
Pin 3: No connection (NC)
Pin 4: Emitter
Pin 5: Collector
Pin 6: Base (optional; leave open for standard operation) 1458 optocoupler datasheet

1. Input Characteristics (The LED Side)

The input side of an optocoupler is essentially an Infrared (IR) LED. The Ultimate Guide to the 1458 Optocoupler: Datasheet,

Note: Always verify the CTR at your intended IF and VCE conditions, as it can vary ±20 % across units. Input side: Connect microcontroller pin → 330Ω resistor

, are designed with clock inputs that allow for a direct optocoupler interface for better isolation.

, high-speed logic gate optocouplers like the 1458 typically follow this standard 8-pin layout: Input Side: Pins for the Anode and Cathode of the internal GaAsP LED. Output Side: cap V sub cap C cap C end-sub , Ground, and the Open Collector output. 3. Essential Design Considerations

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