Patent ID: 7940064

Claim:
A wafer level burn-in apparatus for performing screening of defective products by collectively applying an electric load and a temperature load to all devices formed on a semiconductor wafer divided into a plurality of areas, the wafer level burn-in apparatus comprising: a plurality of temperature sensors that measure temperatures of such areas, respectively; a plurality of temperature deviation calculating devices that calculate a value of a temperature deviation by subtracting a predetermined temperature value from each temperature measured by each temperature sensor in each area, respectively; a plurality of heaters that heat such areas, respectively; a plurality of temperature regulators that control the heaters in response to the temperatures measured by the temperature sensors so that the temperature of each such area becomes a predetermined temperature; a cooling source that cools the entire semiconductor wafer; a switching controller that selects the temperatures measured by the temperature sensors to control the cooling source; a cooling temperature regulator that controls the cooling source in response to a temperature selected by the switching controller; and a tester that inspects such devices, wherein the cooling temperature regulator is controlled by selecting the largest value among the values obtained by the temperature deviation calculating devices and performing the cooling operation so that the temperature deviation becomes 0° C., and heating control is performed for each such area, thereby controlling a temperature of the semiconductor wafer to such predetermined temperature to perform wafer level burn-in.