The part is going away. Keep the line running.
An EOL notice, an allocation letter or a last-time-buy doesn't have to mean a redesign. For long-production-life and hard-to-find Western parts, a verified Chinese second source often keeps the same footprint and function — and we tell you exactly what is not identical before you commit. Sourcing route, provenance and commercial terms are confirmed for each request.
STM32F1 mainstream MCUs
Cortex-M3 workhorses still designed into meters, motor and industrial boards. GigaDevice GD32F103 is a documented pin-for-pin second source.
STM8 8-bit & supervisors
8-bit and reset/supervisor ICs on long-life consumer and industrial designs. HK's 8-to-32 line and same-name analog second sources keep them buildable.
Jelly-bean analog (LM358 / LM393 / LM324 / TL431)
Industry-standard op amps, comparators and references — SGMicro and 3PEAK ship them under the same part number as second sources.