DF3E-4P-2V(21) from Hirose Electric Co Ltd is a 4-position rectangular header in the DF3 series designed for compact board-to-board or cable interconnect applications. With a 2.00 mm pitch, surface-mount termination, shrouded housing, and push-pull fastening, it is suited for space-conscious industrial controls, consumer electronics, embedded boards, power distribution subassemblies, and general-purpose signal or low-voltage power connections. Design features such as board guide and solder retention help support assembly accuracy and mechanical stability in production environments. The connector uses brass contacts with tin finish, a UL94 V-0 polyamide housing, and supports operation from -55°C to 105°C with a 250VAC rating. Lifecycle status is listed as unknown, so designers should confirm current production status directly with Hirose or authorized channel sources before committing to long-term programs. Formal RoHS compliance information is not provided in the supplied data; engineers should verify RoHS and REACH status using the official datasheet or manufacturer compliance documentation.