Burn-in Oven
Burn-in is an electrical stress test that employs voltage and temperature to accelerate the electrical failure of a device. Burn-in essentially simulates the operating life of the device, since the electrical excitation applied during burn-in may mirror the worst-case bias that the device will be subjected to in the course of its useable life. Depending on the burn-in duration used, the reliability information obtained may pertain to the device's early life or its wear-out. Burn-in may be used as a reliability monitor or as a production screen to weed out potential infant mortalities from the lot.
Burn-in is usually done at 125 deg C, with electrical excitation applied to the samples. The burn-in process is facilitated by using burn-in boards (see Fig. 1) where the samples are loaded. These burn-in boards are then inserted into the burn-in oven (see Fig. 2), which supplies the necessary voltages to the samples while maintaining the oven temperature at 125 deg C. The electrical bias applied may either be static or dynamic, depending on the failure mechanism being accelerated.
Figure 1. Photo of Bare and Socket-populated Burn-in Boards
The operating life cycle distribution of a population of devices may be modeled as a bath tub curve, if the failures are plotted on the y-axis against the operating life in the x-axis. The bath tub curve shows that the highest failure rates experienced by a population of devices occur during the early stage of the life cycle, or early life, and during the wear-out period of the life cycle. Between the early life and wear-out stages is a long period wherein the devices fail very sparingly.
Figure 2. Burn-in ovens
Early life failure (ELF) monitor burn-in, as the name implies, is performed to screen out potential early life failures. It is conducted for a duration of 168 hours or less, and normally for only 48 hours. Electrical failures after ELF monitor burn-in are known as early life failures or infant mortality, which means that these units will fail prematurely if they were used in their normal operation.
High Temperature Operating Life (HTOL) Test is the opposite of ELF monitor burn-in, testing the reliability of the samples in their wear-out phase. HTOL is conducted for a duration of 1000 hours, with intermediate read points at 168 H and 500 H.
Although the electrical excitation applied to the samples are often defined in terms of voltages, failure mechanisms accelerated by current (such as electromigration) and electric fields (such as dielectric rupture) are understandably accelerated by burn-in as well.
Hornos de laboratorio y hornos de laboratorioDiseño con protección de muestras como objetivo principal.hornos de laboratorio son una utilidad indispensable para su flujo de trabajo diario, desde el simple secado de cristalería hasta aplicaciones de calentamiento con temperatura controlada muy complejas. Nuestra cartera de hornos de calentamiento y secado proporciona estabilidad de temperatura y reproducibilidad para todas sus necesidades de aplicación. Los hornos de calentamiento y secado de LABCOMPANION están diseñados con la protección de las muestras como objetivo principal, lo que contribuye a una eficiencia, seguridad y facilidad de uso superiores.Comprender la convección natural y mecánica.Principio de convección natural:En un horno de convección natural, el aire caliente fluye de abajo hacia abajo, de modo que la temperatura se distribuye uniformemente (ver figura arriba). Ningún ventilador sopla activamente el aire dentro de la caja. La ventaja de esta tecnología es la turbulencia de aire ultrabaja, que permite un secado y calentamiento suaves.Principio de convección mecánica:En un horno de convección mecánica (impulsión de aire forzado), un ventilador integrado impulsa activamente el aire dentro del horno para lograr una distribución uniforme de la temperatura en toda la cámara (consulte la figura anterior). Una ventaja importante es la excelente uniformidad de la temperatura, que permite resultados reproducibles en aplicaciones como pruebas de materiales, así como para el secado de soluciones con requisitos de temperatura muy exigentes. Otra ventaja es que la velocidad de secado es mucho más rápida que la convección natural. Después de abrir la puerta, la temperatura en el horno de convección mecánica se restablecerá más rápidamente al nivel de temperatura establecido.
Consigue una cotización
Red IPv6 compatible
