The E1SJAS-4.000M TR is a surface mount quartz crystal resonator designed for precision frequency control applications. It operates at a nominal frequency of 4.000 MHz with AT-Cut fundamental mode operation and features a frequency tolerance of ±15 ppm at 25°C and ±30 ppm over the -40°C to +85°C temperature range. The device is housed in an HC49/UP short package with 3.2 mm height and includes a metal resistance weld seal for enhanced reliability. Key electrical characteristics include a maximum equivalent series resistance of 200 Ohms, shunt capacitance of 7 pF maximum, and a maximum drive level of 1 mWatt. This crystal is ideal for timing and frequency control in consumer electronics, telecommunications, and industrial applications requiring stable oscillation with minimal aging (±5 ppm/year maximum).