Siemens 6ES5378-0AA11 EPROM Module

Engineered for SIMATIC S5 Program Storage

This module stores user programs and operating system data securely. It provides non-volatile memory for the Siemens 6ES5378-0AA11 unit. You will find this EPROM card in legacy SIMATIC S5 systems. Unlike battery-backed RAM, this version retains data indefinitely without power. It holds up to 16 KB of program code for CPU execution.

Technical Specifications & Physical Dimensions

We designed this EPROM module for long-term reliable program storage. The table below presents all verified technical specifications.

Parameter	Specification
Memory Capacity	16 KB (128 Kbit)
Memory Type	UV-EPROM (erasable programmable)
Package Type	28-pin DIP (dual in-line)
Physical Dimensions	38mm x 14mm x 9mm
Total Weight	12 grams
Operating Voltage	5V DC (±5%)
Access Time	300 nanoseconds maximum

Functional Architecture and Data Organization

This EPROM module plugs directly into the S5 CPU memory socket. It uses a standard JEDEC pinout for universal compatibility. You cannot rewrite the module without a UV eraser. Moreover, the module features a quartz window for erasure. This window allows ultraviolet light to clear stored data. Consequently, you can reprogram the chip after 15 minutes of UV exposure.

Installation and Operational Guidelines

The Siemens 6ES5378-0AA11 retains data for over 20 years reliably. It requires 12.5V on pin 1 for programming mode. You must align the notch with the socket indicator carefully. Always cover the quartz window with an opaque label after programming. This practice prevents accidental erasure from fluorescent lights. Furthermore, the module supports checksum verification during CPU startup. This feature confirms the integrity of stored program data.

Physical Characteristics and Environmental Limits

This EPROM module features a ceramic body with glass window. Its lightweight 12 gram design allows for easy handling. The layout follows Siemens standard memory module specifications. Therefore, it fits securely into any S5 CPU socket. The module requires no external power for data retention. In addition, it maintains stable operation between 0°C and 70°C ambient temperature. You can store this module safely between -55°C and 125°C.