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HM1-6561B/883 from HAR

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HM1-6561B/883

Manufacturer: HAR

256 x 4 CMOS RAM

Partnumber Manufacturer Quantity Availability
HM1-6561B/883,HM16561B883 HAR 46 In Stock

Description and Introduction

256 x 4 CMOS RAM The part **HM1-6561B/883** is manufactured by **HAR (Harris Corporation)**. It is a **Radiation Hardened 4K x 1 High Speed CMOS Static RAM** designed for military and aerospace applications.  

### Key Specifications:  
- **Technology**: Radiation-hardened CMOS  
- **Organization**: 4K x 1 (4096 x 1)  
- **Speed**: High-speed access (specific timing details depend on datasheet)  
- **Voltage Supply**: Typically operates at **5V**  
- **Temperature Range**: Qualified for **military temperature ranges** (-55°C to +125°C)  
- **Radiation Tolerance**: Designed to withstand **total ionizing dose (TID) and single-event effects (SEE)**  
- **Package**: Ceramic (likely hermetic for high-reliability applications)  
- **Qualification**: **MIL-PRF-38535 Class K** (or equivalent)  

For exact performance parameters (access time, power consumption, etc.), refer to the official **HAR datasheet** or **MIL-SPEC documentation**.

Application Scenarios & Design Considerations

256 x 4 CMOS RAM

Alternative Part Number

  • IDT6116SA55TDB --: 2K x 8 static RAM with similar access time and pinout, widely available as a functional replacement for the HM1-6561B.
  • CY7C128A-55PC --: 2K x 8 CMOS SRAM offering comparable speed and organization, suitable as a drop-in alternative in most legacy designs.
  • MCM6164P55 --: 2K x 8 SRAM with similar timing characteristics and DIP package, a viable second-source option for the original part.

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