Datasheet: 1458 Optocoupler

) is a high-performance, hermetically sealed optocoupler designed for high-speed digital isolation in demanding environments. Type: High-speed logic gate optocoupler. Key Specs: Speed: Typically 10 MBd (megabaud).

Isolation Voltage: Standard models offer around 1500V to 5300Vrms isolation.

Common Mode Rejection (CMR): High immunity to noise transients (often >50 kV/µs). Supply Voltage: Wide range, often 3.0V to 5.5V.

Packaging: Commonly found in DIP-8, DIP-16, or SOP-8 packages, sometimes with hermetic sealing for military or aerospace use.

Datasheet: You can find technical specifications on distributor sites like Alldatasheet or the manufacturer’s product page. 2. Other Components with "1458"

Because "1458" is a very common part number, ensure you aren't actually looking for one of these: MC1458 Dual Op-Amp Go to product viewer dialog for this item. 1458 optocoupler datasheet

: One of the most famous chips with this number. It is a dual version of the classic 741 operational amplifier, used for general-purpose analog signal processing. LTC1458 12-Bit DAC

: A quad 12-bit digital-to-analog converter from Analog Devices. Its datasheet mentions an "optocoupler interface," which might be why it appeared in your search. Quick Verification Checklist: Does your part have 8 or 16 pins? (Likely the HCPL-1458 optocoupler Is it used for analog signal gain in a circuit? (Likely the MC1458 op-amp Is it in a larger SO-28 package? (Likely the LTC1458 DAC

Which of these specific 1458 components are you building into your project? AI responses may include mistakes. Learn more MC1458 - STMicroelectronics

10. Application Circuit Example

Microcontroller to 24V PLC Input Isolation:

• Input side: Connect microcontroller pin → 330Ω resistor → Pin 1 (Anode). Pin 2 (Cathode) → GND.
• Output side: Pin 5 (Collector) → ( V_CC ) = 24V via 10kΩ pull-up → also to PLC input. Pin 4 (Emitter) → GND.
• No external base connection (Pin 6 open).

2. Features

• High Isolation Voltage: 5000 Vrms (typical)
• Current Transfer Ratio (CTR): 50% to 600% (depending on grade)
• Fast Switching Speed: ( t_r ), ( t_f ) typically 4 µs
• Through-hole package: 6-pin DIP (also available in SMD option)
• Operating Temperature: -55°C to +110°C
• Low input current requirement: 5 mA typical

1458 Optocoupler Datasheet Overview

The 1458 optocoupler is a high‑speed, transistor‑output device widely used for signal isolation in digital and low‑power analog circuits. Below is a concise yet comprehensive datasheet‑style summary. Input side: Connect microcontroller pin → 330Ω resistor

Coupled Characteristics

| Parameter | Symbol | Conditions | Min | Typ | Max | Unit | |-----------|--------|------------|-----|-----|-----|------| | Current Transfer Ratio (CTR) | CTR | ( I_F = 5 mA, V_CE = 5 V ) | 50 | 300 | 600 | % | | Collector-emitter saturation | ( V_CE(sat) ) | ( I_F = 10 mA, I_C = 2 mA ) | - | 0.2 | 0.4 | V | | Isolation resistance | ( R_ISO ) | ( V_IO = 500 V ) | ( 10^11 ) | - | - | Ω | | Isolation capacitance | ( C_ISO ) | ( V_IO = 0, f = 1 MHz ) | - | 1 | - | pF |

Part 6: Sourcing the "1458 Optocoupler" – A Practical Guide

Since you cannot buy a "1458 optocoupler" by that name, here is your shopping list based on performance needs:

| If you need... | Buy this part number... | Key Datasheet spec | | :--- | :--- | :--- | | General purpose, cheap, DC switching | PC817 (DIP-4, smaller) | CTR 50-600%, VISO 5kV | | Robust, high isolation, classic | 4N35 (DIP-6) | CTR 100%, VISO 2.5kV | | High voltage (up to 70V) output | 4N36 | VCEO 70V | | AC input detection | H11AA1 | Contains two back-to-back LEDs | | Fast digital communication (1Mbps) | 6N137 | Logic output, 10ns propagation delay | | TRIAC driver for AC mains | MOC3021 | Zero-cross or random phase |

Search Tip: Go to Mouser, Digi-Key, or LCSC. Type "DIP-6 optocoupler" and sort by CTR. Do not type "1458" unless you want op-amps.

Part 1: The Great Confusion – 1458 Op-Amp vs. Optocoupler

Before diving into a datasheet, let's address the elephant in the room. A search for "1458 optocoupler" yields mixed results because there is no industry-standard optocoupler with the primary designation "1458". and assume it's an optocoupler. Consequently

• The 1458 IC: The LM1458 or MC1458 is a classic, dual general-purpose operational amplifier. It contains two independent 741-type op-amps in a single 8-pin DIP package. Its datasheet discusses input offset voltage, slew rate, and gain-bandwidth product.
• The Optocoupler: Optocouplers have designators like 4Nxx (e.g., 4N35), CNYxx (e.g., CNY17), PC8xx (e.g., PC817), or MOCxx (e.g., MOC3021).

Why the confusion? Parts distributors often list "1458" in the same category as analog ICs. A novice engineer might need an isolator, see "1458" on a schematic (meant for an op-amp), and assume it's an optocoupler. Consequently, if you are looking for an optocoupler, you should search for "4N35 datasheet" or "PC817 datasheet" – these are the true workhorses of isolation.

However, for the purpose of this article, we will treat "1458 Optocoupler" as a request for a generic, robust, 8-pin DIP optocoupler datasheet explanation.

Key Specifications of the 1458 Optocoupler

When reading the datasheet for a standard transistor optocoupler, these are the critical parameters you need to check to ensure it fits your circuit.

7. Switching Characteristics (Ta = 25°C, ( V_CC = 10 V, I_C = 2 mA, R_L = 100 Ω ))

| Parameter | Symbol | Conditions | Min | Typ | Max | Unit | |-----------|--------|------------|-----|-----|-----|------| | Rise time | ( t_r ) | - | - | 4 | 18 | µs | | Fall time | ( t_f ) | - | - | 3 | 18 | µs | | Turn-on time | ( t_on ) | - | - | 6 | - | µs | | Turn-off time | ( t_off ) | - | - | 5 | - | µs |

Note: Switching times vary with load resistor and transistor biasing.