A1458 | Optocoupler Datasheet
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, ensuring signal integrity in electrically noisy environments. Output Type Open Collector , allowing for flexible logic level shifting. Core Features & Design Hermetic Sealing
The A1458 is a high-speed, optically coupled isolator that combines a light-emitting diode (LED) and an integrated photon detector. The primary purpose of this device is to provide galvanic isolation, preventing high voltages or ground loops from damaging sensitive microcontrollers (MCUs), digital signal processors (DSPs), or logic circuits. Key Features
Based on recommendations in the and industry best practices: a1458 optocoupler datasheet
+---*---+ Anode 1 | 1 8 | Emitter 2 Cathode 1 | 2 7 | Collector 2 Cathode 2 | 3 6 | Collector 1 Anode 2 | 4 5 | Emitter 1 +-------+ Pin Description Table Pin Number Description Anode input for Channel 1 LED 2 Cathode input for Channel 1 LED 3 Cathode input for Channel 2 LED 4 Anode input for Channel 2 LED 5 Emitter output for Channel 1 Phototransistor 6 Collector 1 Collector output for Channel 1 Phototransistor 7 Collector 2 Collector output for Channel 2 Phototransistor 8 Emitter output for Channel 2 Phototransistor 3. Absolute Maximum Ratings
Inside the package, pin 1 connects to the LED’s anode, pin 2 to its cathode. The phototransistor sits with its collector on pin 4 and emitter on pin 3. There is no base pin exposed; base current is generated solely by illumination. The primary purpose of this device is to
The A1458 competes directly with the PC817 but often offers a higher V_CEO (80V vs 35V), making it superior for 48V industrial systems or relay drivers.
, which is a dual operational amplifier (op-amp) and entirely different in function. STMicroelectronics schematic example of how to connect the A1458 to a microcontroller like an HCPL-A1458 | In Stock | Utsource The phototransistor sits with its collector on pin
CTR is the gain of an optocoupler: (I_C / I_F) * 100%. The A1458 offers multiple rank options:
The A1458 is not an ultra-high-speed device (like a logic gate optocoupler, e.g., 6N137), but it is adequate for most power supply feedback and low-speed data isolation (< 50 kHz).
What (3.3V, 5V) are you driving the input with?
| 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 |
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