LM258AN

Overview

The LM258AN is a low-power dual operational amplifier manufactured by STMicroelectronics. It consists of two independent, high-gain, internally frequency-compensated op-amps designed for single power supply operation over a wide voltage range (3 V to 30 V). The device features a large DC voltage gain of 100 dB and a unity-gain bandwidth of 1.1 MHz. Key electrical characteristics include a low input bias current of 20 nA, an input offset voltage of 2 mV, and an input offset current of 2 nA. The input common-mode voltage range includes the negative rail, allowing ground sensing. The output can swing to ground even with a single supply. It operates within a temperature range of -40°C to +105°C and is housed in a DIP8 plastic package.

Feature Summary

• Internally frequency-compensated for stability without external components
• Low supply current essentially independent of supply voltage magnitude
• Input common-mode voltage range includes the negative supply rail
• Output voltage swings down to ground potential

Applications

• Transducer amplifiers
• DC gain blocks
• Conventional op-amp circuits in single power supply systems

Procurement Notes

Verify that the ordering code matches the specific suffix 'AN' to confirm the industrial temperature grade (-40°C to +105°C) and DIP8 package type. Ensure compatibility with the required operating voltage range of 3 V to 30 V. Confirm that the application does not require automotive-grade qualification unless specified by an 'Y' suffix variant. Check datasheet limits for short-circuit duration when supply voltage exceeds 15 V.

Selection Notes

Select this component for general-purpose analog signal processing where single-supply operation is required. It is suitable for applications directly powered by standard logic voltages like +5 V without needing additional negative rails. Consider the 1.1 MHz bandwidth and 100 dB gain for moderate-speed amplification tasks. Verify that the 2 mV input offset voltage meets the precision requirements of the circuit design.

Part Context

The LM258AN belongs to the LM158/LM258/LM358 family of low-power dual operational amplifiers from STMicroelectronics. While electrically similar to the commercial LM358 and military-grade LM158, the LM258 specifies an extended industrial temperature range. All variants share the same internal architecture and pinout, differing primarily in temperature specifications and manufacturing lot screening.

Replacement Considerations

LM358N: Commercial grade version with 0°C to +70°C range. LM158N: Military grade version with -55°C to +125°C range. LM258D: Same electrical performance but in SO-8 surface-mount package.