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The very well-known Wi-Fi SoC.

Package

(Logo)
ESP8266EX
152019
UB00PN9R50

Die

ESP8089

siliconpr0n.org_map_espressif_esp8266ex_single_espressif_esp8266ex_infosecdj_mz_nikpa40x.thumb.jpg

Top metal imaged under Nikon PlanApo 40x/1.0 oil