Professional IC Distribution & Technical Solutions

The 7405N is a hex inverter IC (integrated circuit) manufactured by Signetics. Below are its key specifications, descriptions, and features:

Specifications:

• Type: Hex Inverter (6 inverters in one package)
• Logic Family: TTL (Transistor-Transistor Logic)
• Technology: Standard Schottky (74S series)
• Supply Voltage (Vcc): 4.75V to 5.25V (Nominal 5V)
• Input Voltage (High): 2.0V (min)
• Input Voltage (Low): 0.8V (max)
• Output Voltage (High): 2.7V (min)
• Output Voltage (Low): 0.5V (max)
• Propagation Delay: Typically 3ns (varies with conditions)
• Operating Temperature Range: 0°C to +70°C (Commercial grade)
• Package Type: 14-pin DIP (Dual In-line Package)

Description:

The 7405N is a hex inverter with open-collector outputs, meaning each of its six inverters provides an inverted output but requires an external pull-up resistor for proper logic-level operation. It is part of the 74S series, which offers faster switching speeds compared to standard TTL.

Features:

• Open-Collector Outputs: Allows wired-AND configurations and interfacing with higher-voltage circuits.
• High-Speed Operation: Faster than standard 7400-series TTL.
• Low Power Consumption: Efficient for its speed class.
• Wide Compatibility: Works with other TTL families (74LS, 74H, etc.).
• Industrial Standard Pinout: Compatible with other 7405 variants.

Applications:

• Logic inversion in digital circuits
• Signal buffering
• Interface level shifting
• Bus driving (with pull-up resistors)

The 7405N is now considered a legacy component, as newer logic families (e.g., 74HC, 74LVC) offer improved performance. However, it remains useful in vintage electronics and repair scenarios.

For exact electrical characteristics, refer to the original Signetics datasheet.