1458 Optocoupler Datasheet Guide

is a high-performance, high-speed optocoupler designed to provide reliable electrical isolation for high-frequency signal transmission. It is frequently used in industrial and power electronics to protect sensitive low-voltage components, like microcontrollers, from high-voltage spikes and noise. Key Technical Specifications

If this works, your "1458 optocoupler" behaves exactly like a 4N35. 1458 optocoupler datasheet

Key specifications (typical values — verify with manufacturer datasheet)

  • Isolation voltage (VOFF): 3.75 kV RMS (minimum) for 1 minute
  • CTR (current transfer ratio): 20%–80% depending on IF and VCE; typical 50% at IF = 1 mA, VCE = 5 V
  • LED forward voltage (VF): 1.15–1.4 V at IF = 20 mA
  • LED reverse voltage (VR): 3–6 V maximum
  • Input forward current (IF, max): 50–60 mA
  • Collector-emitter saturation voltage (VCE(sat)): ≤ 0.2–0.4 V at IF = 5–20 mA, IC = 1–2 mA
  • Collector-emitter voltage (VCEO): 30–80 V depending on part
  • Collector current (IC, max): 50–80 mA
  • Input-output capacitance: ~0.5–3 pF (affects high-frequency performance)
  • CTR temperature coefficient: negative; CTR declines with increasing temperature
  • Operating temperature range: −40 °C to +100 °C (device-dependent)
  • Package: DIP-4 or SO-4 through-hole / surface-mount variants

): Features a wide supply range, allowing for flexibility in various system designs. Power Consumption: Low input current ( IFcap I sub cap F ) requirements help reduce total drive power needs. Isolation voltage (VOFF): 3

Pin 1 & 4: Usually NC (No Connection) or specific anode/cathode pins. Pin 2: Anode (Input LED). Pin 3: Cathode (Input LED). Pin 5: GND (Output side). Pin 6: Vout (Output Signal). Pin 7: NC or Enable. Pin 8: Vcc (Supply Voltage). Common Applications ) : Features a wide supply range, allowing

Typical Application Circuit

* Input side
V_IN ----|>|----+---- R_IN ---- GND
          LED   |
                |
               ( )  Pull‑up resistor R_PULL (10 kΩ) to V_CC
                |
                +----> V_OUT (collector)
                |
               ( )  Emitter to GND

Because datasheets vary wildly based on the exact component you have in hand, official documentation and highly-rated repositories for both options are listed below. 1. High-Speed Optocoupler (HCPL-1458 / A1458)

Applications of the 1458 Optocoupler