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213849-1 Datasheet(PDF) 8 Page - Tyco Electronics |
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213849-1 Datasheet(HTML) 8 Page - Tyco Electronics |
8 / 51 page AMP Circular Connectors for Commercial Signal and Power Applications 8 Catalog 82021 Dimensions are in inches and Dimensions are shown for USA: 1-800-522-6752 South America: 55-11-2103-6000 Revised 7-07 millimeters unless otherwise reference purposes only. Canada: 1-905-470-4425 Hong Kong: 852-2735-1628 specified. Values in brackets Specifications subject Mexico: 52-55-1106-0800 Japan: 81-44-844-8013 www.tycoelectronics.com are metric equivalents. to change. C. America: 57-1-254-4444 UK: 44-208-420-8341 Current Carrying Capabilities Note: All part numbers are RoHS Compliant. The total current capacity of each contact in a given connector is dependent upon the heat rise resulting from the combination of electrical loads of the contacts in the connector arrangement and the maximum ambient temperature in which the connector will be operating. Caution must be taken so that this combination of conditions does not cause the internal temperature of the connector to exceed the maximum operating temperature of the housing material. Several variables which must be considered when determining this maximum current capability for your application are: I Wire Size—Larger wire will carry more current since it has less internal resistance to current flow and generates less heat. The wire also conducts heat away from the connector. I Connector Size—In general, with more circuits in a connector, less current per contact can be carried. I Current Load Distribution— Spreading those lines with greater current loads through- out the connector, particularly around the outer perimeter, will enhance heat dissipation. I Ambient Temperature—With higher ambient temperatures, less current can be carried. Current Rating Verification Can a contact rated at 10 amps carry 10 amps? Maybe yes, but probably not. The reason lies in the test conditions used to rate the contact. If these conditions do not adequately reflect the appli- cation conditions, the actual allowable current levels may be lower than specified levels. For example, many manufacturers, including Tyco Electronics, test a single contact in air. This gives an accurate measure of the basic current-carrying capacity of the contact. Use the contact alone in air and it can certainly carry 10 ampere. Use it in a multi-position connector surrounded by other current- carrying contacts or in high ambient temperatures, and the contact should carry less current. Similarly, as the contact ages and stress relaxation, environ- mental cycling, and other degradation factors take their toll, the contact’s current- carrying capacity decreases. A prudent design must set current levels for such end-of- design-life (EODL) conditions. Practical current-carrying capac- ity is not an absolute, but an application-dependent condition. New Method Simplifies Ratings To help the designer set the appropriate current level, Tyco Electronics has developed a method of specifying current- carrying capacity. This method takes into account the various application factors that influ- ence current rating. The method can be summarized as follows: I The contact is aged to EODL conditions by durability cycling, thermal cycling, and environmental exposure. I The contact’s resistance stability is verified. I The current necessary to produce the specified tempera- ture rise is measured. This T-rise is usually 30°C. I A rating factor is determined to allow derating of multiple contacts in the same housing and for different conductor sizes. Temperature One other factor influencing current levels is the maximum operating temperature, for example, 105°C. If the appli- cation has a high ambient temperature (over 75°C) the contact’s T-rise is limited by the maximum operating temperature. For example, an application temperature of 90°C limits the contact T-rise to 15°C. Since current produces heat (the I2R law), the current must be lowered to limit the T-rise. A contact’s T-rise depends not only on its I2R Joule heating, but also on its ability to dissipate the heat. Consider a contact in a multi-contact housing. Joule heating in multiple contacts will raise the local ambient temper- ature. Since the contact will not be able to dissipate its own heat as well by convection, the maximum T-rise will be realized at a lower current level. Conse- quently, the allowable current level must be lower to maintain an acceptable T-rise. For a given connector, the current level will be set by the loading density. A connector containing 50% current-carrying contacts will permit higher currents (per contact) than a connector will at 75% loading. The loading percentage assumes an even distribution of contacts within the housing. If all 10 contacts are grouped together in one section of a 20-position connector, the loading density may approach 100%. The Importance of EODL As stated, T-rise in a contact depends on both resistance and current. As it ages, a contact’s resistance will increase. The contact designer will specify a maximum resistance for the contact, this level is the end-of- design-life resistance. Before the contact is tested for current, Tyco Electronics subjects it to a sequence of tests that exercises the major failure mechanisms and thereby simulates EODL conditions. Conditioning includes mating cycling, indus- trial mixed-flowing gases, humidity and temperature cycling, and vibration to sequentially introduce wear, corrosion, stress relaxation, and mechanical disturbance. 75 60 56 50 45 35 23 7.5 60 45 30 15 0 Type XII Upgrade Size 8 Upgrade .125 POWERBAND Contact Size 8 Type XII Type I, Type II/III+ Upgrade Type III+, Type II, Type III+ Posted Size 20 Upgrade 20 DF CONTACT CURRENT GUIDE Maximum Current (Amperes) for Largest Wire Size 13 11.85 |
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