| Parameter | Symbol | Value | Unit | Condition/Note | | :--- | :--- | :--- | :--- | :--- | | | IF | 20 (Max) | mA | DC Input current | | Forward Voltage | VF | 1.3 (Typ) / 1.7 (Max) | V | IF = 10 mA | | Peak Transient Current | IF(trans) | 1 | A | Pulse width ≤ 1 µs | | Supply Voltage (Output) | VCC | 4.5 - 5.5 (Recommended) | V | -- | | Output Supply Voltage Range | VCC | 0 - 20 | V | Absolute Maximum rating | | Output Current | IO | 8 (Max) | mA | -- | | High Level Output Current | IOH | -0.4 to -8 | mA | -- | | Low Level Output Current | IOL | 8 | mA | -- | | Data Rate | -- | 50 (Max) | MBd | -- | | Propagation Delay (tPLH) | -- | 45 (Max) | ns | -- | | Propagation Delay (tPHL) | -- | 45 (Max) | ns | -- | | Current Transfer Ratio (CTR) | -- | 15% to 30% | % | -- | | Isolation Voltage (Withstand) | VISO | 5000 (Min) | Vrms | -- | | Common Mode Rejection (CMR) | | 15,000 (Min) | V/μs | For HCPL-1458 | | Operating Temperature | TA | -40 to +100 | °C | -- | | Storage Temperature | TSTG | -55 to +125 | °C | -- | | Lead Solder Temperature | -- | 260 | °C | For 10 sec (DIP package) |
: Compact 8-pin surface-mount footprints optimized for high-density automated PCB pick-and-place lines.
Top View (SOP-8 / DIP-8) +-------U-------+ Anode | 1 8 | VCC (Supply Voltage) Cathode | 2 7 | VO (Output Signal) NC | 3 6 | VO2 / Enable / NC* GND1 | 4 5 | GND2 (Output Ground) +---------------+ *Note: Internal pin configurations vary slightly by model suffix (e.g., Gate Driver vs. Open Collector). Key Technical Explanations & Parameter Analysis 1. High Speed via Decoupled Photodiode-Transistor Design
The "Absolute Maximum Ratings" table for the A1458 is non-negotiable: a1458 optocoupler datasheet
Dark current doubles approximately every 10°C. At high temperatures, it can become significant, so ensure your pull-up resistor and logic threshold account for this.
When a 5V microcontroller needs to control a 12V or 24V industrial relay, direct connection risks blowing out the MCU if the relay coils kick back high inductive voltages.
The A1458 series optocouplers are typically offered in two compact 8-pin packages: | Parameter | Symbol | Value | Unit
While the A1458 excels in high-speed and high-CMR, designers may consider alternatives based on specific needs: Part Number Key Strength HCPL-A1458 1 Ch High Speed Highest CMR (50 kV/μs) & Fast Speed (8 ns) Go to product viewer dialog for this item. 1 Ch High Speed Common alternative in TSR output designs Go to product viewer dialog for this item. 1 Ch High Speed Similar, but widely used in motor drive feedback
It is essential to distinguish this device from the , which is a PNP bipolar junction transistor. The A1458 optocoupler is specifically an isolation device. When sourcing or referencing the datasheet, ensure you are looking at an "Optocoupler" or "High Speed Logic Gate Optocoupler" to avoid confusion.
The isolation barrier is the primary reason to use the A1458. The datasheet provides the following isolation parameters: Key Technical Explanations & Parameter Analysis 1
) passes from the anode to the cathode, the LED emits infrared light.
The is one of the most important specifications in any optocoupler datasheet. It is defined as the ratio of the output transistor's collector current to the input LED's forward current, expressed as a percentage. A CTR of 15% to 30% means that for a given input current, the output will sink a current that is 15% to 30% of that value. This is a key parameter for ensuring the optocoupler can properly drive the input of the following logic gate or microcontroller.
