What this hex buffer does on the board
The SN74LS07N is a six-channel non-inverting buffer from TI's 74LS family with open-collector outputs. Each channel sinks 40 mA. The 14-DIP package is through-hole.

TI 74LS series, Buffer Non-Inverting, SN74LS07N, 6 elements, 1-bit per element, Open Collector output, 40mA sink, 14-DIP, Through Hole, 0°C to 70°C.
| Parameter | Value |
|---|---|
| Series | 74LS |
| Logic type | Buffer, Non-Inverting |
| Output type | Open Collector |
| Mounting | Through Hole |
| Supply voltage | 4.75V ~ 5.25V |
| Current - output high, low | -, 40mA |
| Operating temperature | 0°C ~ 70°C (TA) |
| Package | Tube |
| Case | 14-DIP (0.300\", 7.62mm) |
| Number of elements | 6 |
| Number of bits per element | 1 |
The SN74LS07N is a six-channel non-inverting buffer from TI's 74LS family with open-collector outputs. Each channel sinks 40 mA. The 14-DIP package is through-hole.
Standard 14-DIP hex buffer pinout: inputs on odd pins (1,3,5,9,11,13), outputs on even pins (2,4,6,8,10,12), pin 7 ground, pin 14 VCC. Pin 1 is input A, pin 2 output A, and so on.
The 'N' suffix indicates the through-hole 14-DIP package. SN74LS07 without the suffix typically refers to the same die in a different package (often SOIC or other surface-mount). The electrical specs are identical; the difference is the footprint and mounting method.