1458 Optocoupler Datasheet Jun 2026
Unlike legacy high-speed optocouplers that require a rigid 5V supply, the HCPL-1458 thrives between . This makes it perfectly tailored for battery-powered systems, IoT nodes, and modern low-power microcontrollers operating on a 3.3V bus. High-Speed Propagation Low Delay
The 1458 optocoupler is a reliable and versatile device that offers high isolation voltage, high current transfer ratio, and fast response time. Its wide range of applications and compatibility with various packages make it a popular choice among designers and engineers. By analyzing the datasheet, we have highlighted the key features, specifications, and applications of the 1458 optocoupler, providing valuable insights for users and designers.
The 1458 optocoupler is a dual-channel device that consists of two LEDs and two phototransistors, packaged in a 8-pin DIP (Dual In-line Package) or SOP (Small Outline Package). Its primary function is to transfer signals between two electrically isolated circuits while providing protection against high voltage spikes, noise, and other forms of electrical interference.
The 1458 optocoupler integrates an Infrared Light Emitting Diode (IR LED) optically coupled to a silicon NPN phototransistor within a single compact package.
The HCPL-1458 stands out in the optoelectronics landscape due to its ability to operate reliably at lower logic levels without compromising data speed. Specification Value Description 3.0V to 5.5V Ideal for both legacy 5V TTL and modern 3.3V CMOS systems. Propagation Delay 35 ns (Typical at 10 kHz) 1458 optocoupler datasheet
: Commonly available in a compact SOP-8 or SOIC package style. Pin Configuration (Standard SOP-8) While pinouts can vary by manufacturer, the typically follows this configuration: Input Pins : Dedicated to the LED power supply and ground.
| Parameter | Symbol | Value (Typical) | Unit | |-----------|--------|----------------|------| | Rise Time | t_r | 2 | µs | | Fall Time | t_f | 2 | µs | | Turn-on Time | t_on | 3 | µs | | Turn-off Time | t_off | 3 | µs |
The 1458 optocoupler is a robust component essential for noise reduction and safety in circuit design. By understanding the datasheet parameters—specifically Forward Voltage, CTR, and Isolation Voltage—you can safely implement it in your designs to bridge the gap between low-power logic and high-power peripherals.
R1=VCC−VFIF=5V−1.25V0.01A=375 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 1.25 V and denominator 0.01 A end-fraction equals 375 space cap omega Standard value substitution: Use a or 330 Ωcap omega resistor. 2. Protection Diode ( D1cap D sub 1 Unlike legacy high-speed optocouplers that require a rigid
Acting as an isolated line receiver for high-speed digital data transmission systems where noise immunity is critical. MC1458 data sheet, product information and support | TI.com
Because datasheets vary wildly based on the exact component you have in hand, official documentation and highly-rated repositories for both options are listed below. 1. High-Speed Optocoupler (HCPL-1458 / A1458)
The positive terminal of the internal GaAsP infrared light-emitting diode.
Protecting microcontrollers from high-voltage transients in industrial environments. Its wide range of applications and compatibility with
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Propagation delay measures how fast the optocoupler responds to a change in the input signal. For high-speed logic or communication lines, these metrics (measured in nanoseconds) are crucial to ensure your system timing is not compromised. Pinout and Circuit Configuration
What (e.g., 5V TTL, 3.3V CMOS) are you driving the input with? What is the voltage of your isolated output side? Do you need help calculating the input LED resistor value ?
is most famously associated with the classic MC1458 / LM1458 Dual Operational Amplifier