NDK introduces the NX3215SE series 3.2 mm x 1.5 mm tuning fork crystals which exhibit low equivalent series resistance (ESR) (typical 20 kΩ, maximum 40 kΩ). They offer excellent electric current performance which is optimum for mobile communications, office automation (OA), and audiovisual (AV) applications. A lead-free surface-mount crystal oscillator, reflow soldering is possible using lead-free solder.