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EIA-540AAAA 90th Edition, August 1, 1990
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Detail Specification for Chip Carrier Sockets for Leadless Type A (1.27 mm (.050") Spacing) Chip Carriers for Use in Electronic Equipment
Includes all amendments and changes through Stabilization Notice (No longer revised / updated) , January 2015
Additional Comments: ANSI APPROVED
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The Chip Carrier Sockets of assessed quality covered by this detail specification shall have:

a) Maximum enclosure dimensions that include cover and latching hardware as illustrated in Figure 1.

b) A rated voltage not exceeding 250 volts (rms).

c) A rated current not exceeding 1 ampere.


The object of this detail specification is to provide all information required for the identification and quality assessment of the Chip Carrier Sockets for Leadless Type A Packages (CCS/LLA) described herein by the EIA. The information, contained herein or by reference, is complete and sufficient for inspection purposes.