What is "flatpack"

alt. 1 (context uncountable English) Used attributively of self-assembly furniture 2 (context electronics English) A surface-mounted circuit board with leads attached in the plane of the board n. 1 (context uncountable English) Used attributively of self-assembly furniture 2 (context electronics English) A surface-mounted circuit board with leads attached in the plane of the board

Flatpack is a US military standardized Printed-circuit-board surface-mount-component package. The military standard MIL-STD-1835C defines: Flat package (FP). A rectangular or square package with leads parallel to base plane attached on two opposing sides of the package periphery.

The standard further defines different types with varying parameters which includes package body material, terminal location, package outline, lead form and terminal count.

The main vehicle for testing of high reliability flatpack packages has been MIL-PRF-38534 (General Specification for Hybrid Microcircuits). This document outlines the general requirements of fully assembled devices, whether they are single chip, multichip, or of hybrid technology. The test procedures of these requirements are found in MIL-STD-883 (Test Methods and Procedures for Microelectronics) as a listing of test methods. These methods cover various aspects of the minimum requirements that a microelectronics device must be able to attain before it is considered a compliant device.