STMicroelectronics LM258AST

Overview

LM258AST 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 1.1 MHz unity-gain bandwidth, 100 dB large-signal voltage gain, and rail-to-rail output swing (0 V to V_CC − 1.5 V), with input common-mode range extending to the negative rail. It is widely used in transducer signal conditioning and DC gain blocks in industrial sensor interfaces.

For engineers reviewing the LM258AST datasheet, LM258AST pinout, LM258AST application, or LM258AST equivalent, key selection criteria include its −40 °C to +105 °C operating temperature range, 20 nA max input bias current, 2 mV max input offset voltage at 25 °C, and compatibility with 5 V logic-supply systems without auxiliary rails.

Technical Context

The LM258AST integrates two independent, internally frequency-compensated op amps optimized for stable unity-gain operation across temperature and supply voltage. Its PNP-input stage enables input common-mode voltage down to the negative rail, while the output stage supports sinking up to 20 mA and sourcing up to 40 mA into 2 kΩ loads.

It features temperature-compensated parameters including 7–30 µV/°C input offset voltage drift and 10–300 pA/°C input offset current drift. The device maintains 65–100 dB supply voltage rejection ratio over 5–30 V supply range and exhibits 0.3–0.6 V/µs slew rate under 15 V supply with 100 pF capacitive load.

Key Specifications

Pinout & Package

LM258AST is housed in a MiniSO8 (8-pin mini-small outline) package, measuring 3.0 mm × 4.9 mm × 1.1 mm, with 0.65 mm lead pitch and gull-wing leads. It is RoHS-compliant and ECOPACK®-qualified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-power op amp applications.

Compared with LM258AST, LM2904DT offers broader temperature coverage and automotive certification at no cost to footprint or basic performance, while TLV2372IDR trades industrial voltage range and ruggedness for ultra-low power and full rail-to-rail operation in battery-constrained designs.

Availability

LM258AST is available at Aetrix Electronics and suitable for industrial sensor interfaces, motor control feedback loops, smart thermostat signal chains, and 4–20 mA loop receivers requiring stable component supply across extended temperature ranges.

Supply support for LM258AST 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, delivering intelligent power, analog, MEMS, and microcontroller solutions for industrial, automotive, and consumer markets.

The LMx58 series belongs to ST's general-purpose analog portfolio, engineered specifically for cost-sensitive, single-supply industrial signal conditioning where reliability, wide voltage range, and temperature resilience are prioritized over ultra-low power or rail-to-rail input.

FAQ

What is the maximum recommended supply voltage for LM258AST?

The absolute maximum supply voltage is 32 V, but the recommended operating range is 3 V to 30 V per ST's datasheet. Operation above 30 V risks exceeding junction temperature limits under load, especially with output short-circuits or high ambient temperatures. For long-term reliability in industrial designs, staying within 30 V is strongly advised.

Can LM258AST drive a 10 kΩ load to within 100 mV of the rails?

Yes - at V_CC+ = 5 V, the typical low-level output voltage (V_OL) is 5 mV with 10 kΩ load to ground, and high-level output (V_OH) reaches 3.5 V. At V_CC+ = 30 V, V_OH is typically 27 V and V_OL remains below 20 mV. This meets the "within 100 mV" requirement across its full operating voltage range.

Is LM258AST pin-compatible with LM358DT?

Yes - both LM258AST (MiniSO8) and LM358DT (SO8) share identical pin numbering and functional assignment (dual op amp, same pinout). However, package dimensions differ: MiniSO8 is smaller (3.0 × 4.9 mm vs. 4.9 × 6.0 mm), requiring separate PCB footprints. Electrical specs also differ slightly in offset voltage and temperature range.

Does LM258AST support AC-coupled amplifier configurations?

Yes - its input common-mode range includes ground and its internal compensation ensures stable operation in AC-coupled inverting/non-inverting topologies. Figure 19 and Figure 21 in the ST datasheet explicitly show working AC-coupled designs using LM258-series devices with standard coupling capacitors and bias networks.