Browse Prior Art Database

SMT Component Sockets

IP.com Disclosure Number: IPCOM000241879D
Publication Date: 2015-Jun-05
Document File: 7 page(s) / 216K

Publishing Venue

The IP.com Prior Art Database

Related People

Lance LeRoy Sundstrom: INVENTOR

Abstract

Size, weight & cost constraints typically drive the use of the smallest surface mount technology (SMT) components that meet the worst case (WC) end of life (EOL) requirements. The SMT components are placed as tightly as possible on the printed board assembly (PBA). A prototype PBA is built & tested to verify the final PBA design. Ideally, the prototype & final PBA designs are identical so that all test results are valid. During prototype PBA testing, the SMT components may be replaced several times to select the SMT component which optimizes performance. However, the direct attach SMT components can be replaced only a limited number of times without printed board (PB) damage risk. Current SMT component sockets are typically designed for high-durability, high-speed, and high-volume component testing. These test sockets are much too large, for use on a prototype PBA without impacting relative component placements &, thereby invalidating prototype PBA testing as a means of verifying the final PBA design. This paper introduces example SMT component socket designs that are similar in size to the SMT components, such that the prototype PBA is the same as or similar to the final PBA design. The proposed SMT component socket designs allow the SMT components to be easily installed, removed & replaced several times without PB damage risk.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 29% of the total text.

Page 01 of 7

SMT Component Sockets

Lance LeRoy Sundstrom

ABSTRACT

Size, weight & cost constraints typically drive the use of the smallest surface mount technology (SMT) components that meet the worst case (WC) end of life (EOL) requirements. The SMT components are placed as tightly as possible on the printed board assembly (PBA). A prototype PBA is built & tested to verify the final PBA design. Ideally, the prototype & final PBA designs are identical so that all test results are valid. During prototype PBA testing, the SMT components may be replaced several times to select the SMT component which optimizes performance. However, the direct attach SMT components can be replaced only a limited number of times without printed board (PB) damage risk. Current SMT component sockets are typically designed for high-durability, high-speed, and high-volume component testing. These test sockets are much too large, for use on a prototype PBA without impacting relative component placements &, thereby invalidating prototype PBA testing as a means of verifying the final PBA design. This paper introduces example SMT component socket designs that are similar in size to the SMT components, such that the prototype PBA is the same as or similar to the final PBA design. The proposed SMT component socket designs allow the SMT components to be easily installed, removed & replaced several times without PB damage risk.


1. INTRODUCTION & BACKGROUND

The PBA designs used in markets like commercial, industrial, military & space use the smallest available SMT components that meet the WC EOL requirements and meet stringent design requirements & constraints, including size, weight & cost (SW&C).

In many situations, the optimum values for certain SMT components are determined via prototype PBA testing. As the current SMT component sockets are much larger than their components, the SMT components are directly attached to the PB to ensure that

1


Page 02 of 7

the prototype PBA is similar in size to the final PBA design. However, the replacement of the direct attached SMT components may result in PB damage. To avoid PB damage, the SMT components may be connected using fly wires. The fly wires are used at the risk of introducing parasitic inductance & resistance, which lead to invalid test results.

Hence, SMT sockets that can be attached to SMT component direct attach PB footprints are needed to facilitate prototype PBA testing. Further, the SMT sockets must be similar in size to the SMT component to ensure that the prototype PBA is the same as or as close to the final PBA design.


2. PROPOSED SOLUTION OF THE PROBLEM

Specially designed SMT sockets that can be attached to SMT component direct attach PB footprints are proposed. The size of the proposed SMT socket is comparable to the size of the SMT component resulting in the prototype PBA being the same as or similar to the final PBA design. The proposed SMT socket allows for easy installation, removal & replacement of the SMT compo...