1458 Optocoupler Datasheet ❲VERIFIED 2025❳

| Parameter | Symbol | Conditions | Min | Typ | Max | Unit | |-----------|--------|------------|-----|-----|-----|------| | Current Transfer Ratio (CTR) | CTR | ( I_F = 5 mA, V_CE = 5 V ) | 50 | 300 | 600 | % | | Collector-emitter saturation | ( V_CE(sat) ) | ( I_F = 10 mA, I_C = 2 mA ) | - | 0.2 | 0.4 | V | | Isolation resistance | ( R_ISO ) | ( V_IO = 500 V ) | ( 10^11 ) | - | - | Ω | | Isolation capacitance | ( C_ISO ) | ( V_IO = 0, f = 1 MHz ) | - | 1 | - | pF |

A competent datasheet analysis must cover six mandatory sections:

Optocouplers (also known as optoisolators) are fundamental components in mixed-signal systems, providing electrical isolation between low-voltage control circuits and high-voltage power stages. A datasheet for any optocoupler contains critical information for safe and effective circuit design. However, a search for a "1458 optocoupler datasheet" yields no matching results from major manufacturers (Vishay, Sharp, Toshiba, Renesas, Everlight).

Clarification: The number "1458" almost certainly refers to the LM1458 or UA1458 – a general-purpose dual operational amplifier. This paper addresses the probable user error and redirects focus toward actual optocoupler families (e.g., 4N××, PC×××, HCPL-××××, CNY××). For the purpose of this technical discussion, we will analyze a representative optocoupler, the 4N35, whose datasheet structure typifies the industry standard. 1458 optocoupler datasheet

Assuming your "1458" component is a standard 4-pin DIP package (the most common form factor for simple switching), the pinout is as follows:

Looking from the top (with the notch/dot facing up):

Note: If your chip has 6 pins (like a 4N35), Pins 3, 4, 5, and 6 correspond to the Base, Collector, and Emitter. Always check the physical datasheet if possible.

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).

Among the sea of component numbers, "1458" appears frequently in search queries and parts lists. However, there is a critical distinction to make immediately: The "1458" is most famously a dual operational amplifier (specifically the MC1458 or LM1458), not a standard optocoupler. This confusion is common. Therefore, this article serves two purposes: In the world of electronics, isolation is paramount

By the end of this guide, you will know exactly how to find, read, and apply the correct datasheet for your isolation needs.

This section provides the "map" for your circuit design.