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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | 74ALS |
| Packaging | Bulk | |
| Part Status | Active |
| Logic Type | Transceiver, Non-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 | Surface Mount |
| Package / Case | 20-SOIC (0.209", 5.30mm Width) |
| Supplier Device Package | 20-SO |
| ROHS |  |
The SN74ALS641ANS is a non-inverting transceiver from the 74ALS family, designed for 5V operation. It features open collector outputs with 24mA sink capability, making it ideal for wired-OR logic and level shifting. Available in a 20-SOIC package, it is a practical choice for industrial control, LED driving, and legacy bus interfacing.
- Open Collector Outputs: Enables wired-OR connections and simple level shifting.
- High 24mA Sink: Drives LEDs, relays, and multiple logic inputs directly.
- Bidirectional Operation: Handles data flow in both directions, reducing parts count.
- Wide 5V Supply: Compatible with standard TTL logic levels.
5V Wired-OR Bus
Use the SN74ALS641ANS to create a wired-OR bus for interrupt lines or status signals in 5V systems.
Level Shifting to Lower Voltages
With pull-ups to a lower voltage rail, the open collector output can shift 5V logic down to 3.3V or 2.5V.
LED and Relay Driving
The 24mA sink capability allows direct driving of LEDs or small relays without additional transistors.
Bidirectional Data Transfer
Interface two 5V buses bidirectionally, with direction controlled by the DIR pin.
Industrial Sensor Readout
Read digital sensors in industrial environments, using open collector outputs to wire multiple sensors to one input.
Legacy System Interfacing
Connect legacy 5V peripherals to a modern system, using the transceiver for signal conditioning.
- Q: What is the logic family of the SN74ALS641ANS?
- A: It is part of the 74ALS family, offering a balance of speed and power.
- Q: What is the function of this device?
- A: It is a non-inverting transceiver with 1 channel (8-bit), enabling bidirectional data flow.
- Q: What is the output type?
- A: It has Open Collector outputs, requiring external pull-up resistors.
- Q: What is the voltage range?
- A: It operates from 4.5V to 5.5V, suitable for 5V systems.
- Q: What is the output current?
- A: It can sink up to 24mA; sourcing current is not specified (listed as '-').
- Q: What package is it in?
- A: It comes in a 20-SOIC package with a 5.30mm width.
SN74ALS641ANS.pdf
- Q: What is the logic family of the SN74ALS641ANS?
- A: It is part of the 74ALS family, offering a balance of speed and power.
- Q: What is the function of this device?
- A: It is a non-inverting transceiver with 1 channel (8-bit), enabling bidirectional data flow.
- Q: What is the output type?
- A: It has Open Collector outputs, requiring external pull-up resistors.
- Q: What is the voltage range?
- A: It operates from 4.5V to 5.5V, suitable for 5V systems.
- Q: What is the output current?
- A: It can sink up to 24mA; sourcing current is not specified (listed as '-').
- Q: What package is it in?
- A: It comes in a 20-SOIC package with a 5.30mm width.