Second-sourcing standard analog: LM358, LM393, LM324, TL431

Jelly-bean analog — the LM358 dual op amp, LM393 comparator, LM324 quad, TL431 reference — was multi-sourced from the start. Dozens of vendors ship these under the same industry-standard part number. Chinese analog houses SGMicro and 3PEAK are among them, and their datasheets carry the standard PN directly.

Same number, still verify

"Second source under the same PN" is strong evidence, but analog parts hide their differences in the details: input offset, rail-to-rail behaviour, quiescent current, and — for the TL431 — the reference tolerance grade. For a jelly-bean logic or reference part the risk is low; for a precision path, compare the datasheet parameters that your circuit actually depends on.

How we grade it

Where the vendor ships the exact same part number (e.g. 3PEAK's own LM393), we grade it P2P and cite the second-source datasheet (evidence class E4). Where SGMicro's official cross-reference recommends an equivalent under a different PN, we grade it FUNC and cite that vendor cross-reference (E3) — functionally equivalent, verify against the datasheet. Enhanced or automotive variants (an "A" suffix, -Q100) are flagged with their differences.

See live cross-references for LM358, LM393, TL431, or browse the analog & signal chain coverage.