Guidebolt Electrical Design Standard
All circuit parts should be automotive-grade (AEC-Q).
All parts must be RoHS compliant.
All parts should be halogen free.
Note that "X-Free" generally allows trace amounts below a standard threshold. For example, "halogen-free" and "zero halogen" are typically used interchangeably under the max 1500ppm of total halogens (IEC 61249-2-21).
All circuit parts must be capable of operation and storage in -40C to 105C (or better).
All PCBs must be fabricated to IPC Class 2 (or better).
All PCBs must have rounded corners.
All PCBs must use ENIG surface finish (or better).
All PCBs must have silkscreen text.
Sensitive-signal PCBs must be fabricated with impedance control.
All PCB soldermask should be green.
All PCBs should have thermal conductivity of 0.4W/mK (or better).
All PCBs must have the following text:
- reference designator (one per circuit part)
- functional pin name (one per external pin)
- company name
- design ID (with revision number)
- date of manufacture (YYYY-MM-DD format)
- batch number
- serial number
All PCBs should have 4 or more mounting holes.
All PCB mounting holes must support metric screws.
All PCB mounting holes should be patterned as a rectangle.
Moisture-expected PCBs must have conformal-coating or encapsulation.
All power-connectors and power-ICs must be UL94-V0.
All power-connectors should be glow-wire-capable.
All external pins must have transient voltage protection.
All electrical modules must have at least 50K hours MTBF.
All electrical modules should have at least 150K hours MTBF.
All low-value capacitors should be MLCC.
General-use low-value capacitors should have soft-terminated ends.
All medium-value capacitors should be aluminum-polymer.