SN74LS145NSR

Overview

The SN74LS145NSR is a BCD-to-decimal decoder/driver from the Texas Instruments LS series. It accepts four binary-coded decimal inputs and activates one of ten open-collector outputs corresponding to the input value. The device operates with a supply voltage range of 4.75 V to 5.25 V. Key electrical parameters include a propagation delay of 50 ns, a high-level output current of -250 μA, and a low-level output current capability of 80 mA. It functions within a commercial temperature range of 0°C to 70°C.

Feature Summary

• Accepts binary-coded decimal inputs to activate specific decimal outputs
• Features open-collector outputs capable of sinking up to 80 mA
• Designed for driving incandescent displays or relay loads
• Maintains inactive state for all invalid binary input conditions

Applications

• Driving 10-digit incandescent display panels
• Relay driver circuits requiring high sink current
• Open-collector logic interface applications

Procurement Notes

Verify the package designation matches the SOIC-16 form factor indicated by the NSR suffix. Confirm the LS logic family specification aligns with system requirements. Ensure the operating temperature range meets environmental constraints. Validate that the open-collector output configuration suits the load interface. Check compliance documentation for lead-free status if required.

Selection Notes

Select this component when a BCD-to-decimal translation with high-current sinking capability is required. The open-collector design allows interfacing with voltages higher than the logic supply. Consider the 50 ns propagation delay for timing-sensitive paths. Verify that the 80 mA sink capacity exceeds the connected load requirements. Ensure compatibility with standard TTL logic families.

Part Context

This part belongs to the SN74LS145 family of BCD-to-decimal decoders. It serves as a low-power variant of the standard 74145 device. The LS series offers improved power dissipation characteristics compared to earlier transistor-transistor logic families while maintaining compatible pinouts and functionality.