| Parameter | Symbol | Test Condition | Min | Typ | Max | Unit | |--------------------|--------|----------------------|-----|-----|-----|------| | Rise time | t_r | IF = 10 mA | - | 4 | 8 | µs | | Fall time | t_f | IF = 10 mA | - | 3 | 6 | µs | | Turn-on time | t_on | IF = 10 mA | - | 6 | 10 | µs | | Turn-off time | t_off | IF = 10 mA | - | 5 | 8 | µs |
Before diving into electrical characteristics, let us establish the pinout. The A1458 is typically housed in a 4-pin DIP (Dual Inline Package). The usually presents the following pin assignments (viewed from top):
To effectively implement the A1458 in a circuit, it is crucial to understand its internal structure and pinout layout. Pinout Diagram Description
Features a blazing-fast typical propagation delay ( a1458 optocoupler datasheet
: Contains a GaAsP LED that emits infrared light when current is applied. Output Side
The A1458 is characterized by its speed and high noise immunity. Below are the primary technical parameters found in the HCPL-1458 datasheet Maximum Data Rate , making it suitable for high-speed digital communication. Propagation Delay : Approximately (typical), ensuring fast signal response times. Isolation Voltage : Rated at (standard) or up to depending on the specific variant/package. Common Mode Rejection (CMR) : Minimum of
(Note: Always cross-reference your physical component's physical manufacturer branding—such as Avago/Broadcom, Toshiba, or Everlight—with their exact package diagram, as suffix letters can alter pinouts). How the A1458 Works | Parameter | Symbol | Test Condition |
This simple mechanism creates an electrical barrier. The input side controls the output side via light, not copper. Therefore, there is no direct electrical connection between your high-voltage side and your low-voltage logic.
Understanding the A1458 Optocoupler Datasheet: Features, Pinout, and Technical Applications
Why choose the A1458 over alternatives?
The device is widely available in surface-mount SOP-8 or SOIC-8 packages, as well as 8-pin DIP formats for through-hole mounting. Some high-reliability versions are for use in aerospace or harsh industrial environments. HCPL-1458/ A1458 - Broadcom - Price, Inventory & Datasheets
: No internal electrical connection. Leave isolated on the PCB layout.
| Parameter | Symbol | Test Condition | Min | Typ | Max | Unit | |--------------------------|--------|-------------------------|-----|-----|-----|-------| | LED forward voltage | VF | IF = 20 mA | 1.1 | 1.2 | 1.4 | V | | LED reverse current | IR | VR = 6 V | - | - | 10 | µA | | Collector dark current | ICEO | VCE = 20 V, IF = 0 | - | - | 100 | nA | | Current transfer ratio | CTR | IF = 5 mA, VCE = 5V | 50 | 300 | 600 | % | | Collector-emitter sat. | VCE(sat)| IF = 10 mA, IC = 2 mA | - | 0.2 | 0.4 | V | | Isolation resistance | RISO | VIO = 500 Vdc | 10¹¹| - | - | Ω | | Capacitance (input-output)| CIO | f = 1 MHz | - | 1.0 | - | pF | | VCE(sat)| IF = 10 mA