600VAC/DC Rating and UL94 V-0 Housing
The 10127721-021LF: The tin-plated mating finish (100.0µin thickness) is a workhorse choice for moderate mating-cycle applications — typically 50-100 cycles — and is compatible with the matching Minitek® Pwr 3.0 receptacle crimp terminals. The post finish is also tin, with the same thickness, so the solder joint is reliable through wave-solder processes.
Peer Comparison: 10127721-021GLF vs 10127721-021LF
The closest functional second-source is the 10127721-021GLF — identical in every spec (2 positions, 3.00mm row spacing, tin plating, locking ramp, UL94 V-0) except the GLF variant adds a Glow Wire Compliant feature. If your application does not require glow-wire testing, the 021LF is the direct drop-in alternative.