Delivers clean, squared-off digital signals directly, requiring fewer external components.
High immunity to noise transients (often >50 kV/µs). Supply Voltage: Wide range, often 3.0V to 5.5V.
When you locate the official datasheet, pay special attention to:
: Available in an 8-pin hermetically sealed package (SOP-8 or similar), protecting internal components from environmental factors. Electrical Specifications Typical/Max Value Forward Current ( IFcap I sub cap F ) 20 mA (Max) Output Current ( ICcap I sub cap C ) Operating Temperature -55°C to +100°C Propagation Delay 35 ns at 10 kHz Common Applications 1458 optocoupler datasheet
* Input side V_IN ----|>|----+---- R_IN ---- GND LED | | ( ) Pull‑up resistor R_PULL (10 kΩ) to V_CC | +----> V_OUT (collector) | ( ) Emitter to GND
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:
The internal LED efficiency degrades at elevated temperatures, which lowers the CTR. Designers must over-engineer the input current to ensure full saturation of the phototransistor at peak operating temperatures. When you locate the official datasheet, pay special
The following appendix provides additional information on the 1458 optocoupler datasheet:
Rin=Vin−VFIF=24 V−1.25 V0.01 A=2275 Ω≈2.2 kΩcap R sub i n end-sub equals the fraction with numerator cap V sub i n end-sub minus cap V sub cap F and denominator cap I sub cap F end-fraction equals the fraction with numerator 24 V minus 1.25 V and denominator 0.01 A end-fraction equals 2275 cap omega is approximately equal to 2.2 k cap omega Assuming a minimum CTR of 50%, an IFcap I sub cap F of 10 mA guarantees a available collector current ( ICcap I sub cap C ) of 5 mA. To guarantee logic low separation on a 5V MCU:
VCE(sat)cap V sub cap C cap E open paren s a t close paren end-sub ]: Maximum 0.4 V ( Switching Speed (Typical) 2.0 to 5.0 Turn-Off Time ( tofft sub o f f end-sub ): 2.0 to 5.0 Key highlights specified in the datasheet include: The
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R1=5−1.40.010=360Ωcap R sub 1 equals the fraction with numerator 5 minus 1.4 and denominator 0.010 end-fraction equals 360 space cap omega Circuit 2: Dual-Channel Isolated RS-232/TTL Communication