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
is optimized for speed and stability across a wide range of operating conditions Operating Voltage ( cap V sub cap C cap C end-sub
3.0V to 5.5V, offering flexibility for both 3.3V and 5V logic systems. Propagation Delay:
35 ns (typical) at 10 kHz, making it suitable for high-data-rate communication. Output Type:
TTL-compatible open-collector output, allowing for direct interfacing with various logic families. Package Type: Typically available in a hermetically sealed
or 8-pin widebody package, ensuring long-term reliability in harsh environments. Isolation:
Designed for high-voltage galvanic isolation barriers to prevent ground loops. Core Functionality Like most optocouplers, the consists of two primary internal components: Input Side:
An infrared LED that converts an electrical signal into light. Output Side:
A photosensitive integrated photodetector (often a phototransistor or logic gate) that detects the light and converts it back into an electrical signal. 1458 optocoupler datasheet
This light-based transmission path ensures that there is no direct electrical connection between the input and output, protecting the control circuitry from electromagnetic interference (EMI) and power surges. LTC1458/LTC1458L - Analog Devices
Daisy-Chained Control Outputs. The LTC®1458/LTC1458L are complete single supply, quad rail-to-rail voltage output, 12-bit digital- Analog Devices Single Channel, High Speed Optocouplers Technical Data
| Parameter | Symbol | Value (Typical) | Unit | |-----------|--------|----------------|------| | Rise Time | t_r | 2 | µs | | Fall Time | t_f | 2 | µs | | Turn-on Time | t_on | 3 | µs | | Turn-off Time | t_off | 3 | µs |
Note: Standard optocouplers like the 4N35 are slow (µs range). They cannot pass high-speed data (e.g., I²C at 400 kHz or SPI at 10 MHz). For high speed, use dedicated logic optocouplers (e.g., 6N137).
When working on electronic circuits that involve both high-voltage components and sensitive microcontrollers, safety is paramount. You need a bodyguard that allows the two sides to talk without ever letting them touch physically. Enter the optocoupler.
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.
In this post, we will decode the 1458 optocoupler datasheet, look at its specifications, pinouts, and typical applications.
This datasheet is for informational purposes only. Specifications subject to change without notice. Verify with original manufacturer before design-in. 000 V/μs at 1500 V peak
Manufacturer Contact (example):
Generic Semiconductor Corp. – www.genericsemi.com / support@genericsemi.com
⚠️ Important Note: If you have a specific 1458 optocoupler from a known brand (e.g., Siemens SFH1458 or QT-Brightek QTLP1458), please refer to that manufacturer’s official datasheet, as parameters may differ significantly from the generic version above.
The HCPL-1458 (often referred to simply as the 1458 optocoupler) is a high-speed, hermetically sealed logic gate optocoupler primarily manufactured by Broadcom (formerly Avago). It is specifically engineered for high-reliability applications, including industrial, aerospace, and medical systems where signal integrity and electrical isolation are critical. Key Specifications and Performance
The HCPL-1458 is known for its high-speed performance and robust isolation capabilities. Below are the typical parameters found in its datasheet:
Propagation Delay: Typically 8 ns to 35 ns (depending on specific testing conditions and sub-variants like the HCPL-1458#060), allowing for high-frequency signal transmission.
Isolation Voltage: Provides a high insulation voltage of 5000 Vrms (or 3750 Vrms for certain packages like the standard 8-pin DIP).
Common Mode Rejection (CMR): Minimum of 15,000 V/μs at 1500 V peak, ensuring the device remains immune to high-voltage transients. Supply Voltage ( VCCcap V sub cap C cap C end-sub
): Operates within a range of 3.0V to 5.5V, making it compatible with standard TTL and CMOS logic levels. UA1458). This paper addresses that ambiguity
Output Type: Open-collector output, which can handle voltages up to 20V. Pin Configuration (8-Pin DIP/SO-8)
The HCPL-1458 generally follows the standard high-speed optocoupler pinout: Description 1 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
Because of its hermetic sealing and high-speed operation, the 1458 is frequently used in:
Digital Logic Isolation: Protecting microcontrollers from high-voltage transients in industrial environments.
High-Speed Communication: Isolating line receivers and data transmission systems like RS-485 or CAN bus.
Power Supply Feedback: Providing isolated feedback in switching power supplies.
Medical Equipment: Ensuring patient safety through high-voltage galvanic isolation. Important Distinction: HCPL-1458 vs. MC1458 Single Channel, High Speed Optocouplers Technical Data
Note: There is no industry-standard optocoupler with the primary designation "1458." The "1458" is famously a dual operational amplifier (e.g., LM1458, UA1458). This paper addresses that ambiguity, clarifies the likely confusion, and provides a rigorous methodological framework for analyzing an optocoupler datasheet, using a real, similar device (e.g., 4N35) as a practical example.