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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | 74ALS |
| Packaging | Bulk | |
| Part Status | Active |
| Logic Type | Transceiver, Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Input Type | - |
| Output Type | Open Collector |
| Current - Output High, Low | -, 24mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Through Hole |
| Package / Case | 20-DIP (0.300", 7.62mm) |
| Supplier Device Package | 20-PDIP |
The SN74ALS642A-1NE4 from Texas Instruments is a single-channel inverting transceiver designed for 5V (4.5V to 5.5V) systems. It features Open Collector outputs, enabling wired-OR connections and level shifting with external pull-up resistors. With 24mA sink current, it can drive significant loads. Packaged in a 20-DIP, it is ideal for through-hole PCB designs in industrial control, legacy TTL interfacing, and test equipment.
- Open Collector Outputs: Enables wired-OR logic and flexible level shifting, simplifying multi-device communication.
- High Sink Current (24mA): Can drive relays, LEDs, and other loads directly.
- Through-Hole DIP Package: Easy to prototype and service in legacy systems.
- Proven 74ALS Technology: Reliable, well-documented logic family with wide industry support.
Wired-OR Bus Systems
The Open Collector outputs of the SN74ALS642A-1NE4 allow multiple devices to be connected in a wired-OR configuration, ideal for interrupt lines and shared status buses in 5V systems.
Legacy TTL Interfacing
In legacy industrial equipment, this transceiver interfaces between TTL logic and higher-voltage peripherals, with Open Collector outputs enabling level shifting via external pull-ups.
Motor Controller Signal Routing
For motor control circuits, it routes control signals from a PLC to power drivers, providing robust 24mA sink capability to drive optocouplers and relays.
Memory Bus Isolation
In older computer systems, it isolates the memory bus from the CPU during read/write cycles, with Open Collector outputs preventing bus contention.
Test and Measurement Equipment
In benchtop instruments, it buffers and inverts control signals, ensuring accurate data acquisition in 5V logic environments.
Automotive Diagnostic Interfaces
For automotive diagnostic tools, it translates signals between the ECU and OBD-II connector, operating reliably from 0°C to 70°C.
- Q: What logic family does the SN74ALS642A-1NE4 belong to?
- A: It is part of the 74ALS (Advanced Low-Power Schottky) family, offering a balance of speed and power.
- Q: What is the function of this IC?
- A: It is a single-channel inverting transceiver with Open Collector outputs.
- Q: How many channels does it have?
- A: It has 1 channel, typically used for 8-bit bidirectional data transfer.
- Q: What is the output type?
- A: The outputs are Open Collector, requiring external pull-up resistors for proper logic levels.
- Q: What is the operating voltage range?
- A: It operates from 4.5V to 5.5V, standard for 5V TTL systems.
- Q: What package is available?
- A: It comes in a 20-DIP (0.300", 7.62mm) package, suitable for through-hole mounting.
SN74ALS642A-1NE4.pdf
- Q: What logic family does the SN74ALS642A-1NE4 belong to?
- A: It is part of the 74ALS (Advanced Low-Power Schottky) family, offering a balance of speed and power.
- Q: What is the function of this IC?
- A: It is a single-channel inverting transceiver with Open Collector outputs.
- Q: How many channels does it have?
- A: It has 1 channel, typically used for 8-bit bidirectional data transfer.
- Q: What is the output type?
- A: The outputs are Open Collector, requiring external pull-up resistors for proper logic levels.
- Q: What is the operating voltage range?
- A: It operates from 4.5V to 5.5V, standard for 5V TTL systems.
- Q: What package is available?
- A: It comes in a 20-DIP (0.300", 7.62mm) package, suitable for through-hole mounting.