Low Profile 2.54mm Square Post Header Terminals - TLW Series TLW series single and double row PCB through hole low profile board-to-board square post header terminals with a 2.54mm pitch, a 4.32mm tail length, a 2.67mm terminal length and a black liquid crystal polymer insulator. The contacts of these TLW series low profile square post header terminals are made from phosphor bronze with 0.25μm gold plating on the contacts and gold flash on the tail. The operating temperature range for these TLW series board to board 2.54mm low profile square post headers is -55 to 125°C.