Designed for high-speed switching, providing efficient signal transfer in digital applications.
When integrating the 1458 into your circuit, pay close attention to these parameters found in the Vishay datasheet guidelines Current Transfer Ratio (CTR): Even for high-speed logic gates, ensure the input current ( cap I sub cap F ) is sufficient to drive the output stage. Open Collector Output: This device often requires an external pull-up resistor
Ensuring patient safety through high-voltage galvanic isolation. Important Distinction: HCPL-1458 vs. MC1458 Single Channel, High Speed Optocouplers Technical Data
Standard models offer around 1500V to 5300Vrms isolation.
, allowing for seamless integration into both 3.3V and 5V logic systems. Low Drive Power : Requires low forward current ( cap I sub cap F 1458 optocoupler datasheet
| 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 |
In the electronics industry, the number is most famously associated with a Dual Operational Amplifier (like the MC1458 or LM1458). These are analog chips, not optocouplers. They have 8 pins and look identical to an optocoupler IC, but they function completely differently.
The component is primarily housed in a standard package or a hermetic DIP-8 variant for high-reliability systems. The layout minimizes cross-talk while separating the input (emitter) and output (detector) pins: Pin Number Description Pin 1 Input LED Positive Terminal Pin 2 Input LED Negative Terminal Pin 3 No Connection (internal isolation space) Pin 4 No Connection or optional photodetector base Pin 5 Ground connection for the output stage detector Pin 6 VOUTcap V sub cap O cap U cap T end-sub
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 Important Distinction: HCPL-1458 vs
A direct search for a component explicitly named "" yields a significant discrepancy in electronic component databases. The part number "1458" is predominantly associated with a Dual Operational Amplifier (analog IC), not an optocoupler.
: Optimizes propagation delays to a maximum threshold of
The HCPL-1458 relies on an insulating layer placed securely between a high-efficiency AlGaAs infrared emitting LED and an integrated high-speed photodetector. By isolating circuits optically rather than electrically, it effectively eliminates ground loops, blocks electrical surges, and diminishes electromagnetic interference (EMI). Key highlights specified in the datasheet include:
Often recognized by regulatory bodies like UL 1577 for high-voltage insulation. Low Drive Power : Requires low forward current
Modern, automotive-qualified Broadcom alternative offering high CMTI performance and modern energy efficiency profiles.
How do you actually use this? Here is a classic example of interfacing a 5V microcontroller with a 12V load.
Designed with an integrated shield that delivers superior common-mode rejection, protecting signal integrity in electrically noisy environments.