Application Note PM_AN-4 SPM Series Power Module Qualification Testing 1. Introduction Sumida SPM series power modules are designed for use in industrial, computing and telecommunications products and are characterized for operation over the full temperature range from -40°C to +85°C ambient. To ensure that the modules meet reliability requirements under worst case operating conditions, Qualification Testing is carried out by applying extreme environmental stresses in a controlled manner and confirming that the modules continue to operate normally. Stress tests for qualifying power modules have been developed by the industry, and are defined in the IPC standard IPC9592B. 2. Qualification Tests The IPC9592B standard defines “Requirements for Power Conversion Devices for the Computer and Telecommunications Industries”. This standard provides detailed requirements for qualification testing in sections 4 and 5 of the document, with other sections covering other aspects of power module requirements such as product documentation, quality processes and manufacturing conformance testing. For the SPM series of power modules, Sumida carries out Qualification Testing according to the requirements listed in IPC9592B for Class II products. [Class I is for consumer grade with 5 year life; Class II is for high performance network equipment and industrial grade, with 5 to 15 year life.] Some of the more important tests are summarized in Table 1 below. Test Resistance to Reflow Heat Test Moisture Sensitivity MSL3 Level 3 Moisture Sensitivity MSL1 Level 1 Temperature, Humidity THB and Bias High Temperature HTOB Operating Bias Temperature Cycling TCT Test Power and Temperature Cycling PTC Test Random VibrationOperating Version 1.0 IPC9592B paragraph (IPC/JEDEC J-STD-020) Number of samples 4.7 30 4.7 30 5.2.4 30 1000 hours at 85°C, 85% humidity, max Vin 5.2.5 30 1000 hours with input voltage cycling and load cycling 5.2.6 30 700 cycles, -40°C to +125°C, unpowered 5.2.7 3 100 cycles, power on/off and temperature cycling min to max. 5.2.9 3 30 minutes in each axis, with random vibration 10Hz to 500Hz, 2.4Grms 10 February 18, 2016 Test summary 5 cycles of reflow profile Bake 125°C 24h/moisture soak 30°C, 60% humidity, 192h/245°C Peak reflow 3 times. Bake 125°C 24h/moisture soak 85°C, 85% humidity, 168h/245°C Peak reflow 3 times. Page 1 of 2 Application Note PM_AN-4 Shock-Operating 5.2.11 3 Free Fall 5.2.12 3 5.2.14.3 33 Electrostatic Discharge ESD 5.3.7 3 Acoustic Noise 5.3.10 3 SMT Attachment Reliability 3 shocks per axis, 50G peak, half sine, 11ms duration, with max Vin, no load Dropped on hard surface from 100mm height, one face, one corner 1000 cycles, -40°C to +125°C, dwell time 30 minutes, ramp <1 minute +1kV and -1kV discharges to each pin in turn Max Vin, max and min load Acoustic noise tested to ISO-7779. Table 1 – List of Qualification Tests 3. Test Reports Once the qualification testing is completed for a particular product, a test report is produced. These test reports can be made available to customers on request. Version 1.0 February 18, 2016 Page 2 of 2