Harwin 1.25mm Gecko Series SMT PCB Headers These Gecko series 1.25mm pitch wire to board PCB SMT headers have a dense 1.25mm pin spacing and a low profile miniature design offering both high performance, reliability and PCB space saving. Latches on these Gecko SMT headers provide a secure connection to the mating connector and SMT hold-downs aid PCB retention. These 1.25mm Gecko headers also feature polarization for accurate mating alignment and can withstand extreme temperatures from -65 to +150°C.