This document contains information for the TCAN340x-Q1, which are 3.3V controller area network (CAN) transceivers. The TCAN340x-Q1 comes in the SOIC (D), VSON (DRB), and SOT (DDF) packages to aid in a functional safety system design. Information provided are:

• Functional safety failure in time (FIT) rates of the semiconductor component estimated by the application of industry reliability standards
• Component failure modes and their distribution (FMD) based on the primary function of the device
• Pin failure mode analysis (FMA) for the device pins of TCAN340x-Q1

Figure 1-1 shows the device functional block diagram for reference. TCAN3403-Q1 has the low voltage I/O support at pin 5, while TCAN3404-Q1 has the ultra-low power shutdown mode at pin 5.

Figure 1-1 TCAN3403-Q1 and TCAN3404-Q1 Functional Block Diagram

The TCAN340x-Q1 were developed using a quality-managed development process, but were not developed in accordance with the IEC 61508 or ISO 26262 standards.

This section provides functional safety failure in time (FIT) rates for the TCAN340x-Q1 based on two different industry-wide used reliability standards:

• Table 2-1 provides FIT rates based on IEC TR 62380 / ISO 26262 part 11
• Table 2-2 provides FIT rates based on the Siemens Norm SN 29500-2

The failure rate and mission profile information in Table 2-1 comes from the reliability data handbook IEC TR 62380 / ISO 26262 part 11:

• Mission profile: Motor control from Table 11
• Power dissipation: 57 mW
• Climate type: World-wide Table 8
• Package factor (lambda 3): Table 17b
• Substrate material: FR4
• EOS FIT rate assumed: 0 FIT

The reference FIT rate and reference virtual T_J (junction temperature) in Table 2-2 come from the Siemens Norm SN 29500-2 tables 1 through 5. Failure rates under operating conditions are calculated from the reference failure rate and virtual junction temperature using conversion information in SN 29500-2 section 4.