Datasheet | 1458 Optocoupler

An infrared LED that converts an electrical signal into light. Output Side:

| Pin | Function | Description | |-----|----------|-------------| | 1 | Anode | LED anode; forward‑biased when input signal is present | | 2 | Cathode | LED cathode; completes input circuit | | 3 | Collector| Phototransistor collector; output pulled up to VCC | | 4 | Emitter | Phototransistor emitter; grounded or tied to a reference |

Ground connection for the output photodetector circuit. Pin 6 ( VOUTcap V sub cap O cap U cap T end-sub

Optocouplers (also known as opto-isolators) are fundamental to modern power electronics and industrial automation. The 1458 device is housed in a standard , though surface-mount (SMD) variants are available for high-density circuit boards. Internal Functional Blocks

The HCPL-1458 follows a standard 8-pin optocoupler layout, although it is a single-channel device, often utilizing specialized pins for low-voltage efficiency. Pin Configuration (SOP-8/DIP) VCcap V sub cap C (Case/No Connection) IFcap I sub cap F (Anode): Input LED Anode IFcap I sub cap F (Cathode): Input LED Cathode GND (Ground): Detector Ground VOcap V sub cap O (Output): Output Logic Signal NC (No Connection) VCCcap V sub cap C cap C end-sub : Detector Power Supply 1458 optocoupler datasheet

When a forward current flows through the input LED, it emits infrared light. This light spans the internal isolation gap and strikes the base-collector junction of the adjacent phototransistor. The photons generate electron-hole pairs, inducing a base current that switches the transistor into a conductive state. Because the connection is purely optical, there is no electrical path between the input and output terminals. Pin Configuration and Package Styles

If the phototransistor (Pins 4 and 5) is switching an inductive load like a mechanical relay, solenoid, or DC motor, always place a flyback diode (e.g., 1N4007) in parallel with the load to prevent high-voltage inductive spikes from destroying the transistor. De-coupling Capacitors: Place a 0.1

The "1458" optocoupler (assumed common through-hole transistor-output optocoupler family; e.g., generic PC817-like single-channel phototransistor optocoupler) provides electrical isolation between input (LED) and output (phototransistor). Typical use cases: microcontroller isolation, signal level shifting, noise suppression, and protecting low-voltage logic from high-voltage circuits.

Exceeding I_F = 60mA degrades the LED. The isolation voltage (5 kV_RMS) is the primary advantage over non-isolated solutions. An infrared LED that converts an electrical signal

The 1458 optocoupler datasheet highlights several key features that make this device suitable for a wide range of applications. Some of the key features include:

The negative terminal of the input LED, typically driven via a current-limiting resistor.

The 1458 optocoupler provides an efficient, space-saving solution for dual-channel electrical isolation challenges. Offering high common-mode transient immunity, predictable current transfer ratios, and a compact 8-pin footprint, it bridges the gap between basic slow-speed optocouplers and expensive high-speed digital isolators.

For use in commercial and industrial products, these optocouplers are certified by major safety organizations. They are typically under UL1577, CSA Approved , and many comply with the IEC/EN/DIN EN 60747-5-2 standard for reinforced insulation. The 1458 device is housed in a standard

This article provides a comprehensive overview of the , highlighting its key features, electrical specifications, pinout configurations, and common applications. 1. Product Overview and Key Features

Here is the technical content for a . Since "1458" is not a standard industry part number for an optocoupler (it is typically associated with the dual operational amplifier), this datasheet assumes the 1458 refers to a general-purpose phototransistor optocoupler (similar to a 4N35 or PC817 but with a unique in-house marking). For actual use, please verify the manufacturer (e.g., Siemens, Vishay, or a Chinese brand).

In this post, we will decode the , look at its specifications, pinouts, and typical applications.