Operational Amplifier Sourcing Guide

Operational amplifiers are fundamental building blocks. This guide helps you buy the right op-amp.

By Vigny (深圳市华芯购电子有限公司) · Published 2026-09-27 · Data verified 2026-09-29 · Sources: manufacturer datasheets & HuaXinGou stock verification

Op-Amp Families

General-purpose (LM358/LM324), precision (OP07, OPA2188), high-speed (OPA837, AD8055), low-power (MCP6001), rail-to-rail and instrumentation amplifiers.

Key Parameters

Supply range, input offset voltage, GBW (gain-bandwidth), slew rate, quiescent current, input bias current and package. Precision designs need low offset and drift.

Applications

Signal conditioning, filters, instrumentation, current sensing and audio. Match GBW to your signal frequency with margin.

Sourcing

General op-amps are cheap and available; precision and high-speed parts have tighter supply. HuaXinGou sources TI/ADI/ST/domestic op-amps with alternatives.

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Frequently Asked Questions

What is GBW?

Gain-bandwidth product — the frequency where open-loop gain reaches 1; choose 10x your max signal frequency.

What is rail-to-rail?

Input/output can swing close to both supply rails, useful for low-voltage single-supply designs.

How do I choose between single and dual op-amps?

Dual packages (e.g., LM358) save space when two channels are needed; singles offer layout flexibility.

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