Reliability Handbook
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1 Contents Integrity and Reliability Package Integrity Tests Device Reliability Tests Appendix 1 Calculations Appendix 2 Example of Failure Rate Calculation INTEGRITY AND RELIABILITY ZETEX Semiconductors Reliability department routinely performs a variety of industry standard tests on batches of both discrete components and linear IC s. Each test comprises three parts: A pre-test verifies that only good devices are used. The devices are then subjected to the specified conditions for a defined duration. Electrical tests decide if each device still meets specification requirements. The tests divide into two groups: those that show the integrity of the packaging, and those that predict the overall reliability of a particular device family. PACKAGE INTEGRITY TESTS <top> These tests relate only to the package, and therefore represent a broad range of device types. TEMPERATURE HUMIDITY WITH BIAS (THB) For up to 2000 hours the devices are stored in an environment at 85 C and 85%RH, (hence the commonly recognised name for this test: "85/85"), under reverse bias. The objective of the test is to check the ability of the package to protect the device from a damp environment. TEMPERATURE CYCLING (TC) The objective is to determine the ability of the package to withstand rapid changes of temperature within an air environment. The temperature range involved is usually in the order of -55 C to +150 C although this varies from device to device. Each cycle lasts 60 minutes unless otherwise specified. This test is designed to accelerate the effects of thermal mismatch amongst the die/assembly components RESISTANCE TO SOLDER HEAT (RSHD, RSHF, RSHH & RSHR) These single cycle tests simulate the various conditions that will be seen by the devices during PCB board assembly processes. The use of these tests will check for the integrity of the assembled package. Conditions are: RSHD: RSHF: RSHH: RSHR: 260 C, 10 seconds, Dip 260 C, 30 seconds, Float 350 C / 400 C, 3 seconds, Hand solder 260 C max, reflow cycle, 3 times Zetex Semiconductors Plc Page 1 of 8
2 MOISTURE SENSITIVITY LEVEL (MSL) MSL relates to the packaging and handling precautions for semiconductors. The MSL indicates the time period to which a moisture sensitive device can be exposed to ambient room conditions (approximately 30 C/60%RH). During the solder reflow process; the sudden expansion of any trapped moisture inside the component can result in internal separation (delamination) of the plastic encapsulation from the die or lead-frame, wire bond damage, die damage, and internal cracks. Most of this damage is not visible on the component surface. In extreme cases, cracks will extend to the component surface. In the most severe cases, the component will bulge and pop, this is known as the "popcorn" effect. Testing involves submitting the device to standard assembly conditions including repeated reflow cycles, followed by testing to datasheet parameters. C-mode Scanning Acoustic Microscopy (C- SAM) testing can be performed to validate internal integrity. Zetex products comply with IPC/JEDEC J-STD-020C at MSL 1 unlimited storage. HOT STORAGE (HS) The devices are stored without bias in an environment at the maximum storage temperature (from the device data sheets) for up to 2000 hours. This tests the resistance of the plastic package to degradation and the resistance of the wire bonds to wire bond type failure mechanisms. COLD STORAGE (CS) The devices are stored without bias in an environment at the minimum storage temperature (from the device data sheets) for up to 2000 hours. This tests the resistance of the plastic package to degradation and the resistance of the wire bonds to wire bond type failure mechanisms. AUTOCLAVE (CLV) Autoclave, also known as Pressure Cooker Test (PCT) is an environmental test which measures device resistance to moisture penetration and the resultant effects of galvanic corrosion. Conditions employed during the test include 121 C, 100% relative humidity and 2 atmospheres pressure. This test is highly accelerated and is generally carried out for 96 hours. Zetex Semiconductors Plc Page 2 of 8
3 SOLDERABILITY / SOLDERABILITY (UNLEADED) This test verifies the package s ability to solder onto PCBs successfully using SnPb or lead-free solder. SOLDERABILITY POST HOT STORE Solderability testing is performed after storage for 16 hours at 150 C has been performed. SOLDERABILITY POST TEMPERATURE & HUMIDITY Solderability testing is performed after storage for 168 hours at 85 C/85%RH has been performed. SOLDER WETTABILITY This test, which is related to solderability, measures the time taken for the solder to wet the device s legs/pins using a wetting balance. This must occur within 3 seconds. ESD TESTING These tests determine the device/package s ability to withstand damage or degradation by exposure to electrostatic discharge. There are three types of testing: CDM - Charged Device Model this simulates the discharge that occurs as a charged component discharges to another object at a different electrostatic potential. The results are classified as follows: <125V, 125 to <250V, 250 to <500V, 500V to <1000V, 1000 to <1500, 1500 to <2000, 2000V HBM - Human Body Model this simulates the discharge from a human being. The results are in the ranges as follows: <250V, 250 to <500V, 500V to <1000V, 1000 to <2000, 2000 to <4000, 4000 to <8000, 8000V MM - Machine Model this simulates the discharge from a machine. The results are in the ranges as follows: <100V, 100 to <200V, 200V to <400V, 400V All these tests use a defined electrical charge which is applied to the device across all the pin combinations, testing is usually performed from the lowest voltage upwards to determine the maximum withstand voltage. Zetex Semiconductors Plc Page 3 of 8
4 DEVICE RELIABILITY TESTS <top> The results from these tests are used to predict the reliability of the devices in terms of FIT (1 FIT = 1 failure per billion (1E9 -One thousand million) device hours and mean time to failure (MTTF). As the tests depend to some extent on the design of a particular die, the results are grouped together into families of similar devices. HIGH TEMPERATURE OPERATING LIFE (HTRB, HTGB AND HTOL) High Temperature Operating Life (HTOL), High Temperature Gate Bias (HTGB) and High Temperature Reverse Bias (HTRB) tests are performed to accelerate failure mechanisms that are thermally activated through the use of biased operating conditions. The temperature and voltage used in the stress will vary with the product being stressed, but will generally be from 125 to 200 C with a bias of between 80% and 100% of maximum rating. Duration of the test will be between 168 and 2000 hours. The tests carried out on the product stresses the die and may cause junction leakage. Parametric changes may also occur due to ionic impurities that can be released onto the die surface, either from the package or the die itself. The high temperature of this test accelerates failure mechanisms according to the Arrhenius equations and so simulates a test conducted at a lower temperature for a very much greater length of time. LOW TEMPERATURE OPERATING LIFE (LTOL) This test biases the operating nodes. Typically, several input parameters may be adjusted to control internal power dissipation. These include: supply voltages, clock frequencies, input signals, etc., which may be operated even outside their specified values, but resulting in predictable and nondestructive behaviour of the devices under stress. The particular bias conditions should be determined to bias the maximum number of potential operating nodes in the device. The test is intended to look for failures caused by hot carriers. Zetex Semiconductors Plc Page 4 of 8
5 Appendix 1 RELIABILITY CALCULATION DEFINITIONS A1.1 CALCULATIONS <top> The cumulative hours are calculated using the formula: Cumulative Hours = Number of devices tested x Test hours Percentage fails are calculated by: % Failures = Number of failures Number of devices tested X 100% The mean time before failure is the average time it takes for a failure to occur. It is calculated using the formula: Total device hours MTBF = Total number of failures Failure Rate is the reciprocal of the MTBF. FR = 1 MTBF ELECTRICAL TRIALS A1.2 FAILURE RATE CALCULATION ACCELERATION FACTORS Increasing the temperature of the test environment to which the devices are subjected can accelerate most failure mechanisms. It is therefore possible to perform relatively short tests (typically from 1 week to 2 months) which simulate many years of device stressing under more normal conditions. Clearly it is necessary to have some measure of how greatly the failure mechanisms are accelerated. Suppose a device is stressed at a high temperature, T2 for time t2. It is required to find the equivalent, t1, which would cause the device the same level of stress at a lower temperature T1. It is noted that if T2>T1 then t2>t1. The acceleration factor is then defined as: A= t1 t2 that is, the ratio of the time at the lower temperature to that at the higher. Since the acceleration factor is a dimensionless ratio, it will be equal to the ratio of any other parameters proportional to the stress times. The most useful ratio is that of failure rates, which are inversely proportional to stress times; if f1 is the failure rate at T1, and f2 the failure at T2 then... T2>T1 implies that f2>f1 and A= t1 t2 So if f2 is known f1 is found simply as f1 = A.f2 All that is now required is to find the value of the acceleration factor. Acceleration factor = e E A 1 1 k T1 T2 Zetex Semiconductors Plc Page 5 of 8
6 A1.3 TEMPERATURE ACCELERATION The High Temperature Reverse Bias (HTRB) test is an example of a temperature-accelerated test. It is usually found that the rates of the reactions causing device failure are accelerated with temperature according to the Arrhenius equation. Where E A. = activation energy of the failure mechanism k = Boltzman constant = 8.6E-5 ev/k A, T1, T2 are as defined above The activation energy, E A, is found experimentally and is usually of the order of 1.0eV, depending on the predominant failure mechanism. For the failure mechanisms in Zetex products, a value of 0.9eV has been determined. A1.4 CHI-SQUARED DISTRIBUTION The failure rate predictions quoted in this report are based on a statistical tool known as the "chi-squared" distribution. This is simply a mathematical model that describes the relationship between the actual failure rate of a given device and the observed failure rate of a limited sample of that device. It is generally accepted that the chi-squared distribution is the most accurate model for calculating failure rates from the relatively small numbers of failures observed when testing electronic components. A1.5 THE CHI SQUARED MULTIPLIER, χ 2 The value of the chi squared multiplier, χ 2, depends on the Upper Confidence Level (UCL or α ) to which the failure rate is to be quoted, (see section A1.6 about confidence levels), and the degrees of freedom (ν), calculated from the number of failures, n. The actual values are derived directly from the chi-squared distribution and are usually summarised in tables. The first five values, to a UCL of 60%, are tabulated below: Degrees of freedom ν Chi-Squared value χ A1.6 UPPER CONFIDENCE LEVEL (UCL) The reliability predictions in this report are expressed with a UCL of 60%. This means that for any given device, there is a 60% chance that its failure rate will be less than or equal to the value given. A UCL of 60% is deemed adequate for most applications, however where greater confidence is required the reliability figures should be multiplied by the factor given in the table below: TOTAL NUMBER OF FAILURE RATE MULTIPLYING FACTORS FAILURES 60% UCL 90% UCL 95% UCL 99% UCL Zetex Semiconductors Plc Page 6 of 8
7 A1.7 CALCULATING THE DEGREES OF FREEDOM Since we require the maximum potential failure rate, the value of n used is taken to be 1 greater than the actual number of failures observed during the test period. In order to take the "worst case" it is assumed that the next failure would have occurred at the same time as the test was terminated. If the actual number of failures observed is n, then... Degrees of freedom = ν = 2(n+1) A1.8 DETERMINING FIT VALUE Now that the degrees of freedom has been calculated and the correct χ 2 value has been determined from the Chi squared distribution table the failure rate is calculated from: χ 2 FR = 2 EDH Where: EDH = Equivalent device hours To convert the failure rate to a fit value this formula must be used: A1.9 REFERENCES FIT value = FR 10 9 Further discussion on accelerated testing can be found in the following documents: (1) "VLSI Technology" Edited by Sze Mc-Graw-Hill International Book Company (2) "A Review of the Status of Plastic Encapsulated Semiconductor Component Reliability" RE Lawson British Telecom Journal Vol 2 No 2 April 1984 Further discussion on the application of the chi-squared distribution to failure rate calculations can be found in: "Electronic Equipment Reliability" JC Cluley MacMillan The derivation of the chi-squared distribution and tables is discussed in most advance statistics textbooks. Zetex Semiconductors Plc Page 7 of 8
8 Appendix 2 Example of a Failure Rate Calculation <top> PNP High performance SOT23 Test performed: HTRB for 1008 hours Number tested: 400 Number of failures: 0 Cumulative Device Hours = number of devices tested x Test time = 400 x 1008 = 403,200 The acceleration factor is calculated from the Arrhenius equation (see section A1.3) Test temperature: Service temperature: Activation energy: 150 C = 423 Kelvin 55 C = 328 Kelvin 0.9eV x AF = e = Equivalent device hours = Cumulative Device Hours x Acceleration Factor 403,200 x = 508,966,617.6 Hours It is now possible to calculate the failure rate Degrees of freedom = 2 x (Number of failures + 1) = 2 x (0 + 1) = 2 From the Chi-square table in Appendix 1, χ 2 = 1.83 The failure rate is found using the formula χ FR = = 2 EDH = 1.80 x 10-9 It is then converted to a FIT value using the formula: FIT Value = = FR = = 1.80 FIT The Company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service. Europe Americas Asia Pacific Corporate Headquarters Zetex GmbH Zetex Inc Zetex (Asia) Ltd Zetex Semiconductors plc Kustermann-Park 700 Veterans Memorial Highway Metroplaza Tower 1 Zetex Technology Park, Balanstrasse 59, 8th Floor Hauppauge, NY Hing Fong Road, Kwai Fong Chadderton, Oldham, OL9 9LL D München, Germany USA Hong Kong United Kingdom Tel: (49) Tel: (1) Tel: (852) Tel: (44) Fax: (49) Fax: (1) Fax: (852) Fax: (44) europe.sales@zetex.com usa.sales@zetex.com asia.sales@zetex.com hq@zetex.com Zetex products are distributed worldwide. For details, see Zetex Semiconductors Plc Page 8 of 8
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