Identifying UV-erasable EPROM packages How can ultraviolet (UV) erasable PROMs (EPROMs) be visually recognized on a board or in inventory?

Introduction / Context:EPROM devices can be erased by exposing the silicon die to ultraviolet light. This requires a special package that allows UV to reach the die surface.

Given Data / Assumptions:

• EPROMs are typically in ceramic packages with a quartz or glass window.
• UV light passes through the window to erase stored charge on floating gates.
• Other programmable memories (OTP PROM) lack the window and cannot be UV-erased.

Concept / Approach:The unmistakable identifier of a UV-erasable EPROM is the transparent window. Labels are often placed over the window to prevent accidental erasure.

Step-by-Step Solution:Look for a ceramic package with a circular/rectangular window.Recognize that markings or dots are not universal indicators.Select the option describing the window.

Verification / Alternative check:Manufacturer packaging guides and component photos show the characteristic quartz window on UV EPROMs.

Why Other Options Are Wrong:Colored dots or part-number prefixes are not standardized indicators.“Not identifiable” is incorrect; the window is explicit.Colored plastic packages are not used for UV erasure.

Common Pitfalls:Confusing UV-erasable EPROM with OTP (one-time programmable) EPROM; OTP has no window.

Final Answer:There is a small window on the chip.