Texas Instruments SN7440 NAND Buffer Integrated Circuit

Description:

The Texas Instruments SN7440 Gold Flat Pack Integrated Circuit is used in TTL digital logic systems to perform dual 4-input positive NAND buffer functions for industrial, military, and electronic computing applications. Commonly installed in vintage computers, industrial control equipment, telecommunications systems, laboratory instruments, aerospace electronics, and early digital logic circuits manufactured during the 1960s and 1970s. Maintenance teams, electronics restoration specialists, and collectors use this integrated circuit for equipment repair, PCB restoration, legacy system maintenance, and replacement of obsolete TTL logic devices.

Applications:

The Texas Instruments SN7440 is designed for digital logic processing using two independent 4-input positive NAND buffer gates. It is widely used in vintage computing systems, industrial automation controllers, military electronic equipment, telecommunications hardware, digital test equipment, educational laboratories, and OEM electronic assemblies requiring standard TTL logic functions and reliable signal processing.

Technical Specifications:

• Brand: Texas Instruments (TI)
• Part Number: SN7440
• Product Type: Dual 4-Input Positive NAND Buffer Integrated Circuit (IC)
• Logic Family: TTL (Transistor-Transistor Logic)
• Logic Function: Dual 4-Input Positive NAND Buffers
• Number of Gates: 2
• Inputs per Gate: 4
• Output Type: TTL Logic Output
• Operating Voltage: 5 VDC Nominal
• Operating Temperature: 0°C to +70°C
• Package Style: Gold Ceramic Flat Pack (Vintage Military-Style Package)
• Mounting Type: Through-Hole / Flat Pack PCB Mount
• Technology: Bipolar TTL
• Application: Digital Logic Processing and Signal Buffering
• Typical Industries: Industrial Electronics, Aerospace, Telecommunications, Computing, Instrumentation, and Electronic Test Equipment
• Lifecycle Status: Obsolete / Discontinued Component

Common Replacements:

• Texas Instruments SN74LS40
• Texas Instruments SN74S40
• Texas Instruments SN5440