- Alps - Lots of hard to find electronics components.
- Analog Devices - Wide variety of ICs.
- Crystek - Crystals and Oscillators. Have some very high frequency VCOs. Mouser distributes them.
- Daishinku Corporation - Chineese crystal manufacturer - has a cheap NDK 5 x 3.2 crystal alternative: DSX530GA.
- Silicon Labs - Specialized ICs, telecom ICs.
- Suntsu Frequency Control, Inc. - Brady Foster Suntsu Frequency Control, Inc. 15791 Rockfield Blvd., Unit O Irvine, CA 92618 PH: 949.305.0220 X 234