: Protecting low-voltage control systems from the high voltages used in AC or DC motor drives.
The HCPL-1458 is an integrated opto-isolator that utilizes a short optical transmission path to transfer signals between two electrically isolated circuits. This isolation is critical for protecting sensitive low-voltage components, such as microcontrollers, from high-voltage spikes and reducing ground loop interference. Key Technical Specifications
| 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 | 1458 optocoupler datasheet
R1=VCC1−VFIFcap R sub 1 equals the fraction with numerator cap V sub cap C cap C 1 end-sub minus cap V sub cap F and denominator cap I sub cap F end-fraction (typical diode forward drop), and target
[ CTR = \fracI_CI_F \times 100% ]
The HCPL-1458 generally follows the standard high-speed optocoupler pinout: Description No internal connection 2 Input LED anode 3 Input LED cathode 4 No internal connection 5 6 VOcap V sub cap O Output voltage (Open collector) 7 No internal connection (or sometimes VEcap V sub cap E 8 VCCcap V sub cap C cap C end-sub Positive supply voltage Typical Applications
VF (from datasheet)=1.25 Vcap V sub cap F space open paren from datasheet close paren equals 1.25 V IF=10 mA=0.01 Acap I sub cap F equals 10 mA equals 0.01 A Using Ohm’s Law: : Protecting low-voltage control systems from the high
If you’ve landed here, you likely have a component marked "1458" in hand and are looking for its datasheet. However, before you wire it up, there is a crucial identification step you need to take. In the world of electronics, part numbers can be tricky, and "1458" is often a source of confusion.
Acts as a safe interface between logic circuits and high-voltage TRIAC or Solid-State Relay (SSR) driver networks. Key Technical Specifications | Parameter | Symbol |
The —often listed in datasheets as the NTE1458 or referenced alongside similar industrial optoisolators—is a specialized electronic component designed to provide electrical isolation between two separate circuits. By transferring electrical signals using light waves, it prevents high voltages from damaging sensitive receiving components.
Open-collector output, which can handle voltages up to 20V . Pin Configuration (8-Pin DIP/SO-8)