is a high-speed, logic-gate output optocoupler designed for digital signal isolation. It is primarily used in industrial and electronic applications to protect low-voltage microcontrollers from high-voltage spikes. Ovaga Technologies Key Technical Specifications Based on typical datasheet parameters for the Isolation Voltage: Typically rated at to ensure safe electrical separation. Propagation Delay: Very fast response, with delays as low as maximum for some logic gate variants, or roughly in high-speed switching configurations. Supply Voltage ( cap V sub cap C cap C end-sub Flexible range from 3.0V to 5.5V , making it compatible with both 3.3V and 5V logic systems. Package Type: Available in a hermetically sealed
package, which provides superior protection in harsh or high-moisture environments. Current Transfer Ratio (CTR): Minimum of Ovaga Technologies Common Applications Microcontroller Interfacing: Isolating MCUs from high-power loads. Digital Signal Switching: High-speed data transmission and computer peripherals. Industrial Control:
Ground isolation in telecommunications and automotive systems. Power Supplies: Switching power supply feedback loops. Potentially Related Components
If you were looking for a different "1458" part, it might be one of these: LM1458/LM1558 Dual Operational Amplifier datasheet (Rev. D)
In audio systems or sensor networks, two circuits might have different ground potentials. Connecting them directly burns traces. Placing an optocoupler between the sensor's ground and the microcontroller's ground breaks the loop while passing data.
Because "1458" is not a standard JEDEC part number for an optocoupler, finding the exact PDF can be difficult. It may be a house-branded part (generic) or a misread laser marking. 1458 optocoupler datasheet
Steps to find your datasheet:
Imagine you found a scrap optocoupler labeled "1458" (maybe a counterfeit or house number). How do you test it?
You need: A multimeter, a 5V power supply, a 330-ohm resistor, a 10k resistor, and an LED.
Procedure:
If this works, your "1458 optocoupler" behaves exactly like a 4N35. is a high-speed, logic-gate output optocoupler designed for
CTR is the ratio of output collector current to input forward current, expressed as a percentage:
[ CTR = \fracI_CI_F \times 100% ]
For the 4N35 at I_F = 10mA, V_CE = 10V:
Practical implication: A CTR < 100% means the optocoupler cannot drive an output current larger than the input current. For a microcontroller with I_F = 5mA, the maximum available I_C is at least 5mA (100% CTR).
Author: Technical Analysis Division Date: October 2023 If this works, your "1458 optocoupler" behaves exactly
Before diving into specs, we need to address the elephant in the room.
In the electronics industry, the number "1458" is most famously associated with a Dual Operational Amplifier (like the MC1458 or LM1458). These are analog chips, not optocouplers. They have 8 pins and look identical to an optocoupler IC, but they function completely differently.
However, many manufacturers (especially in the relay and industrial control sectors) produce optocouplers housed in "1458" style packages, or use markings similar to date codes (like "Week 14 of 1958") that can be mistaken for part numbers.
If you are certain your component is an optocoupler (often marked as a photocoupler or isolation IC), it is likely a standard 4-pin or 6-pin DIP optocoupler similar to the industry-standard PC817 or 4N35 series.
For the purpose of this guide, we will analyze the specifications typical of a standard transistor-output optocoupler that carries a 1458-style marking.
Drawing not to scale. Typical dimensions:
Pin 1: Anode
Pin 2: Cathode
Pin 3: No connection (NC)
Pin 4: Emitter
Pin 5: Collector
Pin 6: Base (optional; leave open for standard operation)