Stiffener having an elastic portion

A stiffener, comprising:

• a plurality of upper covers configured to cover an upper surface of a base portion of a male Zero Insertion Force (ZIF);
• and
• a plurality of lateral side covers configured to cover separate, respective lateral sides of the base portion of the male ZIF,
• wherein the plurality of upper covers each include a separate plurality of upper elastic portions having a vertical elasticity.

A test apparatus, comprising:

• a main tester processing circuitry;
• a wafer prober;
• and
• a cable electrically connecting the main tester processing circuitry and the wafer prober,
• wherein the wafer prober includes
• a test head including a test board and a female Zero Insertion Force (ZIF), and
• a test stage having a wafer chuck configured to hold a wafer and a supporter configured to structurally support a probe card,
• wherein the female ZIF of the test head and a male ZIF of the probe card are configured to be engaged to each other using a stiffener interposed therebetween,
• wherein the stiffener includes a plurality of upper elastic portions having a vertical elasticity.