STMicroelectronics LM358AST

Overview

LM358AST from STMicroelectronics is a low-power dual operational amplifier in MiniSO8 package, designed for single-supply operation from 3 V to 30 V. It delivers 100 dB DC voltage gain, 1.1 MHz unity-gain bandwidth, 2 mV input offset voltage, 20 nA input bias current, and rail-to-rail output swing down to 0 V - enabling precision signal conditioning in cost-sensitive industrial and consumer sensor interfaces.

For engineers reviewing the LM358AST datasheet, LM358AST pinout, LM358AST application, or LM358AST equivalent, this device is selected for transducer amplification, DC gain blocks, and single-supply active filters where input common-mode range includes ground and output must drive near-ground loads without negative supply.

Technical Context

This dual op-amp integrates two independent, internally frequency-compensated high-gain amplifiers with PNP input stages enabling input common-mode voltage down to the negative rail (GND). Its architecture supports stable unity-gain operation across temperature and supply voltage variations, with thermal shutdown protection and infinite output short-circuit duration under specified conditions.

Each channel features matched input offset drift (7–15 µV/°C), low noise (55 nV/√Hz at 1 kHz), and 120 dB channel separation at audio frequencies - critical for dual-channel instrumentation and differential signal paths where crosstalk and thermal drift directly impact measurement accuracy.

Key Specifications

Pinout & Package

LM358AST uses the MiniSO8 (8-pin micro-small-outline) package, measuring 3.0 mm × 3.0 mm × 0.95 mm (max height), with 0.65 mm lead pitch and exposed pad option (not electrically connected by default). This compact footprint supports high-density PCB layouts while maintaining thermal resistance of 190 °C/W (junction-to-ambient).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual operational amplifier applications.

Compared with LM358DT and LM2904DT, LM358AST offers the smallest footprint (MiniSO8) for space-constrained consumer and portable designs, while LM2904DT adds automotive qualification and extended temperature operation - making it the only choice for under-hood or factory-floor deployments.

Availability

LM358AST is available at Aetrix Electronics and suitable for temperature sensor interfaces, current-sense amplification, and active filter design requiring stable component supply across industrial, consumer, and automotive-adjacent programs.

Supply support for LM358AST includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

LM358AST belongs to ST's legacy precision op-amp product line, engineered specifically for cost-effective, single-supply signal conditioning in high-volume industrial controls and sensor front-ends.

FAQ

Is LM358AST pin-compatible with standard SO8 dual op-amps like LM358DT?

No - LM358AST uses MiniSO8 (3.0 mm × 3.0 mm) with 0.65 mm pitch, while LM358DT uses SO8 (4.9 mm × 6.0 mm) with 1.27 mm pitch. The pin numbering and functions match (1–8), but physical layout and solder footprint are incompatible without PCB redesign.

Can LM358AST operate from a 3.3 V supply in modern low-voltage systems?

Yes - its 3 V minimum supply rating and rail-to-rail input (including GND) enable direct use with 3.3 V microcontrollers. Output swing reaches 0 V to ~1.8 V (VCC − 1.5 V), sufficient for driving 12-bit ADC references or logic-level comparators.

What is the maximum capacitive load LM358AST can drive without oscillation?

Stable operation is confirmed up to 290 pF (per Figure 18), with phase margin >10° at 25°C. For loads >100 pF, add a 10–100 Ω series resistor at the output to isolate capacitance and maintain stability in active filter or cable-driving applications.

Does LM358AST include ESD protection on all pins?

Yes - it meets HBM 300 V, MM 200 V, and CDM 1.5 kV standards per datasheet Table 1. This protects against typical handling and board-level ESD events but does not replace system-level TVS diodes for I/O lines exposed to connectors or cables.