Patent ID: 6922050

Claim:
A method for testing semiconductor devices, comprising: loading a customer tray comprising semiconductor devices to be tested in a loader; loading the semiconductor devices into a test tray via a buffer tray of a loader buffer; classifying the tested semiconductor devices into high and low quality semiconductor devices and unloading the classified semiconductor devices from the test tray; determining whether the customer tray is empty; if it is determined that the customer tray is not empty, testing the semiconductor devices in a tester; if it is determined that the customer tray is empty, counting the number of semiconductor devices in the buffer tray; comparing the number of semiconductor devices in the buffer tray with the capacity of the tester; if the number of semiconductor devices in the buffer tray is greater than the capacity of the tester, testing the semiconductor devices in the buffer tray; and if the number of semiconductor devices in the buffer tray is smaller than the capacity of the tester, loading the low quality semiconductor devices into the buffer tray for testing.