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  • TMUX405x-Q1 Functional Safety FIT Rate, FMD and Pin FMA

    • SFFS816 March   2024 TMUX4051-Q1 , TMUX4052-Q1

       

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  • TMUX405x-Q1 Functional Safety FIT Rate, FMD and Pin FMA
  1.   1
  2.   Trademarks
  3. 1Overview
  4. 2Functional Safety Failure In Time (FIT) Rates
    1. 2.1 TSSOP Package
    2. 2.2 SOT-23-THIN Package
    3. 2.3 WQFN Package
  5. 3Failure Mode Distribution (FMD)
  6. 4Pin Failure Mode Analysis (Pin FMA)
    1. 4.1 TMUX4051-Q1: TSSOP and SOT-23-THIN Packages
    2. 4.2 TMUX4051-Q1: WQFN Package
    3. 4.3 TMUX4052-Q1: TSSOP and SOT-23-THIN Packages
    4. 4.4 TMUX4052-Q1: WQFN Package
  7. IMPORTANT NOTICE
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Functional Safety Information

TMUX405x-Q1 Functional Safety FIT Rate, FMD and Pin FMA

Trademarks

All trademarks are the property of their respective owners.

1 Overview

This document contains information for the TMUX405x-Q1 (TSSOP, SOT-23-THIN, and WQFN 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 (pin FMA)

Figure 1-1 shows the device functional block diagram for reference.

GUID-20220602-SS0I-DRMR-578C-KK80Q95KRNBF-low.svgFigure 1-1 Functional Block Diagram

The TMUX405x-Q1 was developed using a quality-managed development process, but was not developed in accordance with the IEC 61508 or ISO 26262 standards.

2 Functional Safety Failure In Time (FIT) Rates

2.1 TSSOP Package

This section provides functional safety failure in time (FIT) rates for the TSSOP package of the TMUX405x-Q1 based on two different industry-wide used reliability standards:

  • Table 2-5 provides FIT rates based on IEC TR 62380 / ISO 26262 part 11
  • Table 2-6 provides FIT rates based on the Siemens Norm SN 29500-2
Table 2-1 Component Failure Rates per IEC TR 62380 / ISO 26262 Part 11
FIT IEC TR 62380 / ISO 26262 FIT (Failures Per 109 Hours)
Total component FIT rate 15
Die FIT rate 5
Package FIT rate 10

The failure rate and mission profile information in Table 2-5 comes from the reliability data handbook IEC TR 62380 / ISO 26262 part 11:

  • Mission profile: motor control from table 11
  • Power dissipation: 130 mW
  • Climate type: world-wide table 8
  • Package factor (lambda 3): table 17b
  • Substrate material: FR4
  • EOS FIT rate assumed: 0 FIT
Table 2-2 Component Failure Rates per Siemens Norm SN 29500-2
Table Category Reference FIT Rate Reference Virtual TJ
5 BICMOS ASICs Analog and Mixed =< 50V supply 20 FIT 55°C

The reference FIT rate and reference virtual TJ (junction temperature) in Table 2-6 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.

 

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