| Parameters | 
                                                                                                            
                                            | Mounting Type | Surface Mount | 
                                                                            
                                            | Package / Case | 16-SOIC (0.295, 7.50mm Width) | 
                                                                            
                                            | Operating Temperature | -40°C~125°C | 
                                                                            
                                            | Packaging | Tube | 
                                                                            
                                            | Series | 74HC | 
                                                                            
                                            | Part Status | Obsolete | 
                                                                            
                                            | Moisture Sensitivity Level (MSL) | 2 (1 Year) | 
                                                                            
                                            | HTS Code | 8542.39.00.01 | 
                                                                            
                                            | Voltage - Supply | 2V~6V | 
                                                                            
                                            | Base Part Number | 74HC7403 | 
                                                                            
                                            | Function | Asynchronous, Synchronous | 
                                                                            
                                            | Current - Supply (Max) | 1mA | 
                                                                            
                                            | Memory Size | 256 64 x 4 | 
                                                                            
                                            | Access Time | 49ns | 
                                                                            
                                            | Data Rate | 30MHz | 
                                                                            
                                            | Bus Directional | Uni-Directional | 
                                                                            
                                            | FWFT Support | No | 
                                                                            
                                            | Expansion Type | Depth, Width | 
                                                                            
                                            | RoHS Status | ROHS3 Compliant | 
                                                                                                    
                            
                         
                                                74HC7403D,512 Overview
You can find FIFO memory chip in the 16-SOIC (0.295, 7.50mm Width) package.The package comes in a case of Tube .Apps and data can be stored in the 256 64 x 4 memory of the FIFO chip.To ensure reliable operation, the temperature should be regulated to -40°C~125°C .Mounting type Surface Mount is assigned to the FIFO memory.It uses a supply voltage of 2V~6V  to operate.The memory logic belongs to the series 74HC .It has a maximum operating supply current of 1mA .The 74HC7403 family of objects contains it.
74HC7403D,512 Features
256 64 x 4 memory size
74HC series
Best part number of 74HC7403
74HC7403D,512 Applications
There are a lot of NXP USA Inc. 74HC7403D,512  FIFOs Memory applications. 
- PC peripheral
- Portable Information Devices
- A/D output buffers
- GPS Offender Tracking
- Consumer Systems
- IP Radio
- High-speed disk
- Signal processing
- HDD
- SPI Bus Flash Memory Device