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+5V (MCU Side) +24V (Load Side) | | [R1] (330 Ohm) [R_Load] | | (Pin 1) Anode (Pin 5) Collector +--------+ +--------+ | \ / | | /| | | \/ | >>> Optical Barrier >>> | / | | | ---- | | \| | +--------+ +--------+ (Pin 2) Cathode (Pin 4) Emitter | | [MCU GPIO Pin] GND (24V Side)
Traditional general-purpose optocouplers encounter a bottleneck: the large base-collector capacitance of standard phototransistors slows down signal transitions, resulting in prolonged propagation delays.
| Pin | Name | Function | | :--- | :--- | :--- | | | V⁺ (Anode) | Anode of the internal infrared LED (Input). | | 2 | V⁻ (Cathode) | Cathode of the internal infrared LED (Input). | | 3 | NC | Not Connected. | | 4 | GND | Ground connection for the output side. | | 5 | V₀ (Output) | Open-collector output of the photodetector. | | 6 | VCC (Cathode) | Power supply for the output side. | | 7 | NC | Not Connected. | | 8 | VE (Enable) | Output enable pin. | 1458 optocoupler datasheet
A standard optocoupler datasheet is divided into eight critical sections. Here is what you need to look for.
This family of optocouplers boasts several features that make them a preferred choice for designers: +5V (MCU Side) +24V (Load Side) | |
R1=VCC1−VFIFcap R sub 1 equals the fraction with numerator cap V sub cap C cap C 1 end-sub minus cap V sub cap F and denominator cap I sub cap F end-fraction (typical diode forward drop), and target
– Connects to the positive side of the input signal via a current-limiting resistor to drive the internal IR LED. | | 3 | NC | Not Connected
This comprehensive technical guide serves as an expanded datasheet overview, covering pin configurations, electrical specifications, operational mechanics, and practical circuit designs. 1. Device Overview and Core Architecture
R1=VCC−VFIF=5V−1.2V0.010A=380 Ωcap R sub 1 equals the fraction with numerator cap V sub cap C cap C end-sub minus cap V sub cap F and denominator cap I sub cap F end-fraction equals the fraction with numerator 5 V minus 1.2 V and denominator 0.010 A end-fraction equals 380 space cap omega Using a standard, readily available resistor value, a is ideal. Circuit 2: Modifying Switching Speed using Pin 6 (Base)