A1458 Optocoupler Datasheet Best Jun 2026

: Ground return connection for the isolated secondary receiver circuit. Pin 6 ( VOcap V sub cap O

, it is frequently used to bridge low-voltage control signals and high-voltage power stages, such as driving IGBTs or Power MOSFETs in motor control systems. Ovaga Technologies Key Specifications According to technical data from , the primary electrical characteristics include: : Supports high-speed communication up to Isolation Voltage : High safety rating of (standard) to (enhanced). Supply Voltage ( cap V sub cap C cap C end-sub : Wide operating range of 3.0 V to 5.5 V , making it compatible with both 3.3V and 5V logic. Propagation Delay : Highly responsive with typical delays around 35 ns to 45 ns Common Mode Transient Immunity (CMR) : Exceptional noise rejection, typically 15,000 V/µs 50,000 V/µs

Integrating the A1458 requires strict attention to the 8-pin mapping layout to prevent reverse polarity failures or unbuffered floating logic gates.

Anode (Input LED 2 / NC depending on single/dual channel variant) Pin 5: GND (Ground reference for the output detector stage) Pin 6: VOUT1cap V sub cap O cap U cap T 1 end-sub (Output Signal 1) Pin 7: VOUT2cap V sub cap O cap U cap T 2 end-sub VBcap V sub cap B (Output Signal 2 or Base connection for transistor tuning) Pin 8: VCCcap V sub cap C cap C end-sub (Positive Power Supply for the detector stage) Functional Mechanism When a forward current ( IFcap I sub cap F

In micro-controller units (MCUs) or programmable logic controllers (PLCs), high external voltages from motors or relays can leak back into delicate logic systems. The A1458 acts as a barrier, allowing the MCU to transmit commands safely via infrared light. II. Switching Power Supplies (SMPS) a1458 optocoupler datasheet

What (3.3V, 5V) are you driving the input with?

If the A1458 datasheet shows a 6-pin DIP or SMD-4 package, verify pin 6 (base connection). A base pin allows external speed adjustment but is absent in cheaper 4-pin variants.

Understanding the pinout is crucial for proper circuit integration. While the pinout can vary slightly based on the specific variant (PDIP-8 vs. SOIC-8), the A1458 family generally follows a standard configuration.

Digital logic transitions power an internal infrared LED. This emitted light crosses a physically isolated air gap or glass barrier inside the chip, completely preventing raw current from crossing between the input and output networks. : Ground return connection for the isolated secondary

Typically ranges from 50% to 300%. The CTR defines the ratio of output collector current to input forward current ( Switching Time: Rise time ( ) and fall time (

Standard optocouplers reduce switching speeds due to the internal base-collector parasitic capacitance found inside basic phototransistors. The A1458 mitigates this limitation by physically separating the photodiode bias network from the output-transistor collector. This specialized diode-transistor configuration drops internal parasitic capacitance, accelerating signal transmission times.

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Optocouplers are essential components in modern electronics, providing electrical isolation between low-power control circuits and high-voltage power systems. Among the various options available to engineers, the (often associated with high-performance optoelectronic devices from manufacturers like Broadcom/Avago) stands out for its reliability and speed. Supply Voltage ( cap V sub cap C

The A1458 optocoupler is a fundamental component for creating safe, reliable, and efficient electronic systems. With variants like the robust HCPL-1458 and the high-performance HCNW1458, the A1458 family provides a scalable solution for a wide array of isolation needs, from basic DIY projects to demanding industrial and automotive applications. By leveraging the detailed specifications, pin configuration, and circuit design insights provided in this guide, you are well-equipped to integrate the A1458 into your next project successfully.

| Pin Number | Name | Description | |------------|-------------|------------------------------------| | 1 | Anode (A) | Positive terminal of the IR LED | | 2 | Cathode (C) | Negative terminal of the IR LED | | 3 | Emitter (E) | Output phototransistor emitter | | 4 | Collector (C)| Output phototransistor collector |

The isolation barrier is the primary reason to use the A1458. The datasheet provides the following isolation parameters: