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74LS05 Hex Inverters with Open Collector IC (7405) DIP 14 Package
The 74LS05 is a Hex Inverter IC—it contains six independent NOT gates (inverters) in one package.
Each gate inverts the logic state of its input, meaning:
- If the input is HIGH (1), the output is LOW (0)
- If the input is LOW (0), the output is HIGH (1)
However, unlike the standard 7404 inverter, the 74LS05 features open-collector outputs, allowing the outputs to sink current but not source it. This means external pull-up resistors are required to produce proper logic HIGH levels.
This open-collector configuration makes the IC ideal for driving LEDs, relays, lamps, or interfacing with higher voltage circuits.
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Features :-
- Six Independent INVERT Gates.
- Open Collector Outputs Require Pull-Up Resistors.
- Operating Temperature to 70°C.
- Standard TTL Switching Voltages.
Specifications :-
| Symbol | Parameter | Min | Max | Unit |
| VCC | Supply Voltage | 4.75 | 5.25 | V |
| VIH | HIGH Level Input Voltage | 2 | – | V |
| VIL | LOW Level Input Voltage | – | 0.8 | V |
| VOH | HIGH Level Output Voltage | – | 5.5 | V |
| IOL | LOW Level Output Current | – | 8 | mA |
| TA | Free Air Operating Temperature | 0 | 70 | °C |
Applications
- LED, relay, and lamp drivers
- TTL to higher-voltage interfacing
- Logic signal inversion
- Level shifting circuits
- Switching and control logic
- Buffering with open-collector outputs
- Wired-AND logic configurations
- Pulse shaping and digital control circuits
* Product image for illustration purposes only, actual product may vary.
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