The AB from Abracon LLC is a RF Quartz Crystal with Frequency 1.84 to 160 MHz, Frequency Stability ±10 ppm, ±15 ppm, ±20 ppm, ±25 ppm, ±30 ppm, ±35 ppm, ±50 ppm, Frequency Tolerance ±10 ppm, ±15 ppm, ±20 ppm, ±25 ppm, ±30 ppm, Drive Power Level 100 to 1000 uW, Load Capacitance 18 pF. Tags: Thru Hole. More details for AB can be seen below.