1458: Optocoupler Datasheet

Operating the device beyond these limits can cause permanent physical degradation or immediate component failure. All ratings are measured at an ambient temperature ( TAcap T sub cap A ) of 25°C unless otherwise specified. Input (Emitter) 60 mA Reverse Voltage ( VRcap V sub cap R ): 6.0 V Power Dissipation ( PDcap P sub cap D ): 100 mW Output (Detector) Collector-Emitter Voltage ( VCEOcap V sub cap C cap E cap O end-sub ): 50 V Emitter-Collector Voltage ( VECOcap V sub cap E cap C cap O end-sub ): 7.0 V Collector Current ( ICcap I sub cap C ): 50 mA Power Dissipation ( PCcap P sub cap C ): 150 mW Total Component Isolation Test Voltage ( VISOcap V sub cap I cap S cap O end-sub ): 5300 VRMScap V sub cap R cap M cap S end-sub (1 Minute) Operating Temperature Range ( TAMBcap T sub cap A cap M cap B end-sub ): -55°C to +100°C Storage Temperature Range ( TSTGcap T sub cap S cap T cap G end-sub ): -55°C to +150°C Soldering Temperature (10 seconds): 260°C Electrical Characteristics

3.0V to 5.5V, offering flexibility for both 3.3V and 5V logic systems. Propagation Delay:

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Because the HCPL-1458 series is from a specific manufacturer, finding a "drop-in" replacement can be challenging. However, you can find equivalent components by looking for optocouplers from other reputable brands (like , Toshiba , or ON Semiconductor ) that share the same key specifications.

Because the 1458 contains two independent channels in an 8-pin footprint, Channel 1 can be used for the Transmit (TX) line, while Channel 2 handles the Receive (RX) line. This achieves full-duplex isolated serial communication using a single IC chip, saving massive board space. 6. Layout and PCB Design Guidelines

: 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 Operating the device beyond these limits can cause

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

Since no "1458 optocoupler" exists, we analyze the widely available 4N35 from Vishay or ON Semiconductor.

Standard models offer around 1500V to 5300Vrms isolation. Propagation Delay: This public link is valid for

| Parameter | Value | |-----------|-------| | Isolation Voltage (t = 1 min) | 5000 V_RMS | | Creepage Distance (min) | 7 mm | | Clearance (min) | 7 mm | | CTI (Comparative Tracking Index) | ≥ 175 |

This report analyzes the likelihood of a misidentification, proposes the most probable intended components (such as the or specific 4-pin optocouplers like the PC817), and provides datasheet specifications for these likely candidates.