1、JEDEC STANDARD Power and Temperature Cycling JESD22-A105C (Revision of JESD22-A105-B) JANUARY 2004, Reaffirmed January 2011 JEDEC SOLID STATE TECHNOLOGY ASSOCIATION NOTICE JEDEC standards and publications contain material that has been prepared, reviewed, and approved through the JEDEC Board of Dire
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9、ber of copies through entering into a license agreement. For information, contact: JEDEC Solid State Technology Association 3103 North 10th Street Suite 240 South Arlington, VA 22201-2107 or refer to www.jedec.org under Standards and Documents for alternative contact information. JEDEC Standard No.
10、22-A105C Page 1 Test Method A105C (Revision of A105B) TEST METHOD A105C POWER AND TEMPERATURE CYCLING (From JEDEC Board Ballot JCB-03-70, formulated under the cognizance of the JC-14.1 Subcommittee on Reliability Test Methods for Packaged Devices.) 1 Scope This test method applies to semiconductor d
11、evices that are subjected to temperature excursions and required to power on and off during all temperatures. The power and temperature cycling test is performed to determine the ability of a device to withstand alternate exposures at high and low temperature extremes with operating biases periodica
12、lly applied and removed. It is intended to simulate worst case conditions encountered in typical applications. The power and temperature cycling test is considered destructive. It is intended for device qualification. 2 Terms and definitions 2.1 Temperature cycle time Time between one high temperatu
13、re extreme to the next, or from one low temperature extreme to the next, for a given sample; see Figure 1. 2.2 Ramp rate The rate of temperature increase or decrease per unit of time for the sample(s). Ramp rate should be measured for the linear portion of the profile curve, which is generally the r
14、ange between 10% and 90% of the test condition temperature range; see Figure 1. Note: Ramp rate can be load dependent and should be verified for the load being tested. 2.3 Dwell time The amount of time the sample temperature has exceeded the specified temperature, either the high or the low temperat
15、ure; see Figure 1. 2.4 Power cycle time Time between one power on to the next, or from one power off to the next, for a given sample; see Figure 1. JEDEC Standard No. 22-A105C Page 2 Test Method A105C (Revision of A105B) 2 Terms and definitions (contd) 2.5 Duty cycle, power The ratio of the power-on
16、 time duration per cycle to the total cycle time. NOTE Power duty cycle is usually expressed as a percentage. 3 Apparatus The apparatus required for this test shall consist of a controlled temperature chamber capable of producing the specified temperatures within the specified transition times. Sock
17、ets or other mounting means shall be provided within the chamber so that reliable electrical contact can be made to the device terminals in the specified circuit configuration. Power supplies and biasing networks shall be capable of maintaining the specified operating conditions throughout the testi
18、ng period despite normal variations in line voltages or ambient temperatures. The test circuitry should also be designed so that existence of abnormal or failed devices does not alter the specified conditions for other units on test. Care should be taken to avoid possible damage from transient volta
19、ge spikes or other conditions that might result in electrical, thermal, or mechanical overstress. 4 Procedure When special mounting or heat sinking is required, the details shall be specified in the applicable specification. The power should then be applied and suitable checks made to assure that al
20、l devices are properly biased. During the test, the power applied to the devices shall be alternately cycled 5 minutes on 5 minutes off unless otherwise specified in the applicable specification. The devices shall concurrently be cycled between temperature extremes for the specified number of cycles
21、. The time at the high and low temperature extremes shall be sufficient to allow the total mass of each device under test to reach the specified temperature extremes with no power applied. The low temperature to high temperature transition or reverse sequence is acceptable. The power and temperature
22、 cycling test shall be continuous except when parts are removed from the chamber for interim electrical measurements. If the test is interrupted as a result of power or equipment failure, the test may restart from the point of stoppage. JEDEC Standard No. 22-A105C Page 3 Test Method A105C (Revision
23、of A105B) 4 Procedure (contd) 4.1 Test conditions The electrical bias circuit shall be specified in the applicable specification. The device shall be subjected to the test conditions derived from Table 1 as illustrated in Figure 1. 4.2 Precautions Since case and junction temperatures of some devices
24、 can be significantly greater than ambient temperature, the circuit should be structured so that the maximum rated case or junction temperature shall not be exceeded. Precautions should be taken to avoid electrical damage and thermal runaway. Direct heat conduction to sample(s) shall be minimized. I
25、f liquid nitrogen (LN2) is used, care must be taken to avoid direct exposure of the parts and boards to the LN2. The test setup should be monitored initially and at the conclusion of a test interval to establish that all devices are being stressed to the specified requirements. Deviations must be co
26、rrected prior to further cycling to assure the validity of the qualification data. 4.3 Solder interconnect considerations Devices with solder interconnects have cycle rates that are in the range of 1 to 2 cph. These include flip chip, ball grid array and stacked packages with solder interconnections
27、. Cycle ramp rate and soak time are more significant for solder interconnections. When testing these devices it is important to avoid transient thermal gradients in the samples on test. Samples with large thermal mass and low heat transfer efficiency require ramp rates slow enough to compensate for
28、the thermal mass. The temperature of the sample should be within a few degrees of the ambient temperature during the temperature ramps. Typical ramp rate for this situation is 15 C/minute or less for any portion of the cycle. For samples without a thermal mass constraint, the ramp rate can be faster
29、. JEDEC Standard No. 22-A105C Page 4 Test Method A105C (Revision of A105B) 4 Procedure (contd) 4.3 Solder interconnect considerations (contd) Table 1 Typical Test Conditions Test Condition Temperature Extremes Degrees C.Transition Time Between Temp Extreme, Max. Dwell Time at Each Temp Extreme, Min.
30、 A -40(+0, -10) to +85(+10,-0) 20 minutes 10 minutes B -40(+0, -10) to + 125(+10, -0) 30 minutes 10 minutes 020406080-20-40POWER ON*POWER OFF5101520 25 30 35 404550 55 60 65ONE POWERCYCLETEMP(oC)TIME (MINUTES)ONETEMPERATURECYCLEDWELL TIME10 MINUTES, MINIMUMTRANSITION TIME20 or 30 MINUTES, MAXIMUMRAM
31、P RATE10%90%* Power cycle need not be synchronized with temperature cycle. Figure 1 Typical power and temperature cycle test condition JEDEC Standard No. 22-A105C Page 5 Test Method A105C (Revision of A105B) 4 Procedure (contd) 4.4 Measurements The electrical measurements shall be made at intervals
32、per the applicable specification. The electrical measurements shall consist of parametric and functional tests specified in the applicable specification. 5 Failure criteria A device is defined as a failure if parametric limits are exceeded or if functionality cannot be demonstrated under nominal and
33、 worst case conditions specified in the applicable specification. Mechanical damage shall not include damage induced by fixturing or handling or the damage is not critical to the package performance in the specific application. 6 Summary The following details shall be specified in the applicable spe
34、cification: a) Special mounting, if applicable. b) Test conditions from Table 1. c) Biasing conditions. d) Power duty cycle, if other than specified in clause 4. e) Test intervals. f) Electrical measurements. g) Sample size. h) The number of temperature cycles. JEDEC Standard No. 22-A105C Page 6 Tes
35、t Method A105C (Revision of A105B) Standard Improvement Form JEDEC JESD22A105C The purpose of this form is to provide the Technical Committees of JEDEC with input from the industry regarding usage of the subject standard. Individuals or companies are invited to submit comments to JEDEC. All comments
36、 will be collected and dispersed to the appropriate committee(s). If you can provide input, please complete this form and return to: JEDEC Attn: Publications Department 3103 North 10th Street Suite 240 South Arlington, VA 22201-2107 Fax: 703.907.7583 1. I recommend changes to the following: Requirement, clause number Test method number Clause number The referenced clause number has proven to be: Unclear Too Rigid In Error Other 2. Recommendations for correction: 3. Other suggestions for document improvement: Submitted by Name: Phone: Company: E-mail: Address: City/State/Zip: Date:
