Part of the Day · LM358 — SOIC-8 dual op amp

Part of the Day · 2026-10-23

The most common general-purpose amplifier, with two op amps in one package. It runs from a single supply and its input range extends down to GND, so it is widely used to amplify sensor signals.

Actual size

↓ Actual size, left edge aligned to 0 on the ruler

One ruler tick = 1mm. On PC this is actual size on a 24-inch FHD monitor at 100% zoom; on iPhone it adjusts automatically. For other screens, use “Calibrate ruler” below.

Enlarged (SOIC-8 · top view · approx. 15×)

Pins 1 OUT1 (output 1) · 2 IN1− (inverting input 1) · 3 IN1+ (non-inverting input 1) · 4 V− (GND) · 5 IN2+ (non-inverting input 2) · 6 IN2− (inverting input 2) · 7 OUT2 (output 2) · 8 V+ (supply)

Package SOIC-8

Key specifications

Values are from the Texas Instruments datasheet.

Marking and pins

Typical uses

• Sensor / current-sense signal amplification (single supply)
• Substitute comparator, voltage monitoring
• Feedback amplifier in power supply, charger and motor control circuits

Companion & similar parts

• LM358B — Newer version from the same datasheet — 3 ~ 36V, GBW 1.2MHz, 300µA per amplifier
• LM2904 — Same pinout, -40 ~ 125℃ temperature range (supply 3 ~ 26V)
• LM258 — Wide-temperature family from the same datasheet, same pinout

LM358 and LM358B have similar part numbers but differ in maximum supply voltage and bandwidth. When substituting, check the suffix too (A, B, BA). The output does not swing all the way to V+ (not rail-to-rail).