The Rohm Semiconductor LM358DT is a widely used low-power dual operational amplifier (op-amp) designed for single-supply or split-supply operation, typically packaged in a standard SOIC-8 surface-mount format. This component is ideal for general-purpose analog signal processing applications such as signal conditioning, active filtering, sensor interface, and buffering, particularly in automotive, industrial, and consumer electronic systems. The LM358DT delivers good performance in terms of power consumption, voltage range, and frequency characteristics, while being compatible with a wide range of analog circuit designs.

## General Description

The LM358DT consists of two independent, high-gain, internally frequency-compensated operational amplifiers designed to operate from a single power supply over a wide range of voltages. It is also capable of dual-supply operation. The device features low power consumption, a wide gain bandwidth, and an input common-mode range that includes ground, which makes it particularly well-suited for single-supply applications.

## Key Features

* Two independent op-amps per package
* Internally frequency-compensated for unity gain
* Wide supply voltage range:

* Single supply: 3 V to 32 V
* Dual supply: ±1.5 V to ±16 V
* Input common-mode range includes ground (single-supply operation)
* Output voltage swing to ground
* Low input offset voltage: typically 2 mV
* Low supply current: typically 0.5 mA per amplifier
* Unity-gain stable
* Short-circuit protection on output
* Compatible with industry-standard LM358 devices

## Electrical Characteristics (at Ta = 25°C, VCC = 5 V unless stated otherwise)

| Parameter | Typical | Maximum | Unit |
| ----------------------------------- | -------------- | ----------- | -------- |
| Supply Voltage (Single) | — | 32 | V |
| Supply Voltage (Dual) | — | ±16 | V |
| Supply Current per Channel | 0.5 | 1 | mA |
| Input Offset Voltage | 2 | 7 | mV |
| Input Bias Current | 20 | 100 | nA |
| Input Offset Current | 2 | 30 | nA |
| Input Common-Mode Voltage Range | 0 | VCC – 1.5 | V |
| Output Voltage Swing (RL = 2kΩ) | 0 to VCC – 1.5 | — | V |
| Large Signal Voltage Gain | 100 | — | V/mV |
| Common-Mode Rejection Ratio (CMRR) | 65 | 85 | dB |
| Power Supply Rejection Ratio (PSRR) | 65 | 85 | dB |
| Slew Rate | 0.3 | — | V/μs |
| Unity Gain Bandwidth | 1 | — | MHz |
| Operating Temperature Range | –40 to +85 | — | °C |

## Functional Characteristics

* Gain Bandwidth Product: With a typical unity-gain bandwidth of 1 MHz, the LM358DT is suitable for low-to-mid frequency applications like audio and sensor signal processing.
* Slew Rate: A typical slew rate of 0.3 V/μs makes it appropriate for slowly changing or low-frequency signals rather than high-speed applications.
* Low Power Operation: With a typical supply current of 0.5 mA per amplifier, it fits well in battery-operated and low-power designs.
* Output Stage: The op-amp can drive resistive or capacitive loads directly and has an output that swings from ground to VCC – 1.5 V under normal loads.

## Package and Mechanical Information

* Package Type: SOIC-8 (Small Outline Integrated Circuit)
* Package Code: LM358DT (standard reel/tape for surface-mount assembly)
* Mounting Type: Surface-mount (SMT)
* Number of Pins: 8
* Lead Pitch: 1.27 mm
* Body Dimensions: Approximately 5.0 mm × 4.0 mm × 1.5 mm (L × W × H)
* Thermal Resistance (Junction to Ambient): ~125°C/W
* Moisture Sensitivity Level (MSL): Level 1

## Pin Configuration (SOIC-8)

```
LM358DT (Top View)
+-------------------+
1 | OUT A | 8 VCC (positive supply)
2 | –IN A | 7 OUT B
3 | +IN A | 6 –IN B
4 | GND (negative) | 5 +IN B
+-------------------+
```

## Application Examples

* Sensor Signal Conditioning: Amplifying low-level sensor outputs such as thermistors, photodiodes, or strain gauges.
* Active Filters: Low-pass, high-pass, band-pass filters in analog front ends.
* Integrator and Comparator Circuits: Due to its input range and ground-referenced input capability.
* Voltage Followers (Buffers): Isolation between circuit stages.
* Low-Frequency Oscillators: Used in waveform generators or tone circuits.
* Battery Management Systems: Voltage monitoring and level shifting.

## Advantages

* Cost-effective solution for general-purpose op-amp needs
* Low power operation suitable for portable and battery-powered devices
* Input includes ground, which is not available on older op-amp families like the LM741
* Compatible with dual-supply or single-supply operation, providing flexibility in system design
* Drop-in replacement for standard LM358 devices in similar configurations

## Summary of Key Specifications

| Specification | Value |
| ---------------------- | ------------------------------------------ |
| Channels per package | 2 |
| Supply voltage | 3 V to 32 V (single), ±1.5 to ±16 V (dual) |
| Typical supply current | 0.5 mA per amplifier |
| Input offset voltage | 2 mV typ |
| Slew rate | 0.3 V/μs |
| Unity-gain bandwidth | 1 MHz |
| Output swing | Ground to VCC – 1.5 V |
| Package | SOIC-8 |
| Temperature range | –40°C to +85°C |

## Conclusion

The Rohm Semiconductor LM358DT is a reliable, low-power, dual general-purpose operational amplifier designed to meet a wide range of analog signal processing requirements. Its ability to operate with a single power supply, inclusion of ground in the input range, and low power consumption make it ideal for cost-sensitive designs in industrial, automotive, and consumer applications. With proven compatibility and a wide operating voltage range, the LM358DT is a versatile and essential building block in analog circuit design.