The opening of any datasheet introduces the device's key selling points. For the HCPL-1458 series, these features set the stage for its performance. The is a high-speed, dual-channel optocoupler , meaning it houses two independent isolators in a single chip, which is great for saving space on a printed circuit board (PCB) and reducing overall component count. Similarly, the HCPL-1458 is designed for high-speed digital communication and provides electrical isolation to protect circuitry from electrical noise, ground loops, and interference.
Because the 1458 contains two independent channels in an 8-pin footprint, Channel 1 can be used for the Transmit (TX) line, while Channel 2 handles the Receive (RX) line. This achieves full-duplex isolated serial communication using a single IC chip, saving massive board space. 6. Layout and PCB Design Guidelines
These values define how the device performs under standard, safe operating conditions. Input Characteristics Typical 1.2 V to 1.4 V ( Reverse Current ( IRcap I sub cap R ): Maximum 10 Capacitance ( CJcap C sub cap J ): Typical 30 pF ( Output Characteristics Collector Dark Current ( ICEOcap I sub cap C cap E cap O end-sub ): Maximum 50 nA ( Collector-Emitter Breakdown Voltage (
By default, Pin 6 (the base) is left disconnected. However, standard phototransistors suffer from storage time delays because charges get trapped in the base region. To achieve faster turn-off times ( tofft sub o f f end-sub Connect a between Pin 6 (Base) and Pin 4 (Emitter). 1458 optocoupler datasheet
: CTR is the ratio of the output collector current (IC) to the input forward current (IF), expressed as a percentage.
A higher CTR ensures that a low-power control signal can effectively drive the output transistor into saturation. Switching Speeds 0.2 Propagation Delay Time to Low Output ( tPHLt sub cap P cap H cap L end-sub ): 0.2
The HCPL-1458 is widely available in a standard and Dual Inline Package (DIP-8). Correct pin matching is essential to prevent internal component stress or latch-up. Single Channel, High Speed Optocouplers Technical Data The opening of any datasheet introduces the device's
Maintain a minimum distance of 5mm to 8mm between the copper traces on the input side (Pins 1–4) and the output side (Pins 5–8).
The 1458 optocoupler is a high‑speed, transistor‑output device widely used for signal isolation in digital and low‑power analog circuits. Below is a concise yet comprehensive datasheet‑style summary.
Engineers turn to the HCPL-1458 technical specifications when standard phototransistor couplers lack the speed or low-voltage efficiency required for modern microcontrollers. Specification Value Key Benefit 3.0 V to 5.5 V Direct compatibility with 3.3V and 5V logic. Propagation Delay 35 ns (typical at 10 kHz) Enables high-bit-rate data transmission. Isolation Rating VRMScap V sub cap R cap M cap S end-sub (1 Minute) Heavy-duty protection against spikes. Package Type SOP-8 (Small Outline) Ideal for high-density, space-constrained PCBs. Output Type Open Collector / Logic Gate Flexible level shifting with external pull-ups. Pinout Configuration and Package Details Similarly, the HCPL-1458 is designed for high-speed digital
Commonly found in DIP-8, DIP-16, or SOP-8 packages, sometimes with hermetic sealing for military or aerospace use.
Protecting sensitive measurement systems from noisy ground loops. Motor Control:
If you have a component mislabeled as a "1458 optocoupler" in your BOM, here is what it is actually used for:
However, for the purpose of this article, we will treat "1458 Optocoupler" as a request for a .
Translating the datasheet into a real-world circuit is the final step. Here's a simple procedure based on the information you've gathered.