The plastic SMD crystal oscillator that became a de facto standard

April 1987


Oscillator with built-in AT-cut crystal unit sealed in heat-resistant cylinder
Reference output frequency range: 1.0250 MHz - 26.00000 MHz
Output enable function included
Operating voltage: 5.0 V +/- 0.5 V
Operating temperature: -40 degrees centigrade to +85 degrees centigrade
Soldering conditions: 260 degrees centigrade x 10 sec. Max. x 2 times or less; or 230 degrees centigrade x 3 min. or less
Dimensions: (W) 14.00 x (D) 8.65 x (H) 4.7 mm
Current consumption: 25 mA MAX.

The SG-615, released in April 1987, was the quartz device industry's first crystal oscillator to come in a plastic SMD (surface mount device) package. This groundbreaking product opened the door for other SMD-type crystal devices, which up to that time were usually encased in metal packages. The migration to a plastic package was enabled by technology from Epson's semiconductor manufacturing operations. Before an SMD package could be used, researchers needed a crystal unit that would be able to withstand the harsh conditions present in a reflow-soldering system. The breakthrough came with the development of an AT-cut crystal unit sealed in a heat-resistant cylinder. The reference output frequency range was approximately 1 MHz to 26 MHz, and overtone oscillator enabled even higher order frequency. An Epson CMOS IC was used for the oscillation circuit, thus achieving low current consumption.

The SG-615 became a de facto standard product after the dominant personal computer manufacturer of the day started using it as a control clock in its PCs; other PC manufacturers soon followed suit. Epson thus established its position as a leader in SMD products for the quartz device industry. The product lineup has done nothing but grow ever since.