SMJ4464-12JDL

Overview

The SMJ4464-12JDL is a 64K x 4 page mode dynamic random access memory (DRAM) manufactured by Texas Instruments. It features a maximum access time of 120 ns and operates within a voltage range of 4.5 V to 5.5 V. The device is housed in a 18-pin plastic DIP package with a 0.300-inch body width. It supports common I/O types and includes RAS-only, CAS-before-RAS, and hidden refresh modes. The operating temperature range extends from 0°C to +70°C.

Feature Summary

• Supports page mode operation for efficient sequential data access
• Includes multiple refresh modes: RAS-only, CAS-before-RAS, and hidden refresh
• Utilizes a common input/output interface structure
• Hermetically sealed ceramic construction available in side-brazed variants

Applications

• Military-grade embedded memory systems requiring radiation tolerance
• Avionics control units demanding high reliability
• Spacecraft data storage subsystems
• Industrial control environments with strict temperature constraints

Procurement Notes

Verify the specific suffix designation carefully, as JDL indicates a plastic DIP package while other suffixes may denote hermetic ceramic packages. Confirm that the required performance specifications align with the 120 ns access time and 4.5V to 5.5V operating voltage range. Ensure compatibility with existing system interfaces before procurement.

Selection Notes

Select this component when a radiation-hardened DRAM solution is required for space or military applications. Compare against similar SMJ series parts if different access speeds or package styles are needed. Verify that the 64Kx4 density meets the system memory requirements and that the plastic DIP package fits the board layout constraints.

Part Context

This part belongs to the SMJ series of radiation-hardened static and dynamic random access memories designed for harsh environments. It is distinct from commercial counterparts due to its enhanced reliability and specific packaging options. The series is widely used in defense and aerospace sectors where standard commercial components would fail under radiation stress.

Replacement Considerations

Direct substitutes include other SMJ4464 variants with different access times or package types, such as SMJ4464-15JDS. Cross-referencing with HM50464P-12 may be necessary for pin-compatible alternatives, though electrical characteristics must be verified.