Note: Access to the phototransistor's base (Pin 6) allows engineers to fine-tune the transistor's switching characteristics, adjust sensitivity, or add a leakage resistor to ground to improve turn-off times. 3. Absolute Maximum Ratings
This datasheet is for informational purposes only. Specifications subject to change without notice. Verify with original manufacturer before design-in.
: Certified to work reliably from -40∘Cnegative 40 raised to the composed with power C +100∘Cpositive 100 raised to the composed with power C across harsh industrial environments. Core Applications
The photons strike the base area of the internal phototransistor. This generates electron-hole pairs in the semiconductor material, producing a base current. 1458 optocoupler datasheet
Due to its combination of fast response times and low power dissipation, the 1458 optocoupler series serves as a critical bridge in several topologies: Single Channel, High Speed Optocouplers Technical Data
Complete Technical Guide and Datasheet Analysis for the "1458 Optocoupler"
Over years of continuous operation, the light output of the internal LED will gradually decrease. Designers typically factor in a 20% to 50% safety margin for high-reliability systems. 6. Primary Applications Note: Access to the phototransistor's base (Pin 6)
The 1458 series is typically housed in standard Dual In-line Packages (DIP) or Surface Mount Devices (SMD) packaging. In dual-channel configurations (such as the ILD1458), the pinout is structured to maximize PCB routing efficiency and maintain creepage distances.
, which protects internal components from moisture and contaminants in harsh environments. TTL Compatibility
When the phototransistor turns off, the inductive coil inside the relay will collapse, producing a high-voltage back-EMF spike. Always place a flyback diode (such as a standard ) in parallel with the relay coil to protect Pin 5 ( VCEOcap V sub cap C cap E cap O end-sub ) from exceeding its 30V limit. Specifications subject to change without notice
The family of optocouplers associated with the keyword "1458 optocoupler datasheet" represents a high-performance range of digital isolators. They are characterized by their high-speed data rates, superior noise immunity (high CMTI), strong isolation voltage ratings, and TTL-compatible outputs, making them an excellent choice for engineers who require robust signal isolation. If you have a more specific part in mind, such as the , HCPL-A1458 , or HCNW1458 , I can help you refine the search to find even more precise technical details.
If the phototransistor (Pins 4 and 5) is switching an inductive load like a mechanical relay, solenoid, or DC motor, always place a flyback diode (e.g., 1N4007) in parallel with the load to prevent high-voltage inductive spikes from destroying the transistor. De-coupling Capacitors: Place a 0.1
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit | |-----------|--------|------------|-----|-----|-----|------| | Forward voltage | ( V_F ) | ( I_F = 20 mA ) | 1.0 | 1.2 | 1.4 | V | | Reverse current | ( I_R ) | ( V_R = 6 V ) | - | 0.01 | 10 | µA | | Capacitance | ( C_t ) | ( V_R = 0, f = 1 MHz ) | - | 30 | - | pF |