Meggitt (Sensorex) has its own design and production unit for thick film hybrid circuits using SMD die and bare chips transfer.
Thick film technology
- Materials: ceramic substrate (Al203), aluminum nitride (ALN), steatite…
- Thickness : 0.25mm to 6mm
- Dimensions: up to 8’’x 8’’ (4’’x4’’ standard)
- Conductors: Au / Ag / PdAg / PlAu / PlPdAg / …
- Resistors: from 0.1MΩ to 100MΩ
- Accuracy : up to 0.1%
- TCR : 50ppm/°C to 100ppm/°C (<10ppm/°C differential)
- Operating temperature : -55°C to +200°C
- Conductors to widths : 90µm in thick film technology / 50µm in screen process printing / multi layers in thick film technology (7 layers) (single or double face) with metallized holes
Hybrid and Multi-Chip-Module
- Die bonding
- Automatic wire bonding (wedge and ball bonding) (ultrasonic or thermosonic with aluminum or gold wire)
- Die protection with ceramic packaging, hermetic package (ceramic or Kovar) or automatic coating by « glob top »
- Solder lead frame in SIL, DIL, SO (1.27mm to 2.54mm pitch)
- Dynamical trimming (voltage, current and frequency)
- Operating temperature : -55°C to +200°C
- Automatic electrical tests between -55°C and +125°C
Chip on Board and SMD
- Low cost hybrid process
- Use of organical substrates
- Die bonding
- Automatic die protection by process « glob top »
- Automatic surface mounting components (up to 9000 components per hour)
- Re-melting welding
- Final electrical test
- Operating temperature : -40°C to +85°C