SN74LS145NG4

Overview

The SN74LS145NG4 is a BCD-to-decimal decoder/driver from Texas Instruments' LS logic family. It accepts four binary-coded decimal inputs to activate one of ten open-collector outputs. The device operates on a single 5V supply (4.75V to 5.25V) with a propagation delay of 50 ns. It features inverted outputs and can sink up to 80 mA per output, making it suitable for driving high-current loads like relays or incandescent displays.

Feature Summary

• Accepts binary-coded decimal inputs to select one active low output
• Open-collector outputs capable of sinking high current for direct load driving
• Outputs remain inactive during invalid binary input conditions

Applications

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

Procurement Notes

Verify the package type matches your PCB footprint, as the NG4 suffix typically indicates a specific plastic leaded frame variant. Confirm RoHS compliance status for the specific manufacturing lot if required by your assembly standards. Ensure input voltage levels are compatible with standard TTL logic families for reliable operation.

Selection Notes

Select this component when a dedicated BCD-to-decimal translation is needed with high-current output capability. It serves as a low-power alternative to older standard TTL decoders. Consider the open-collector nature for level shifting or wired-OR configurations in your circuit design.

Part Context

This part belongs to the Texas Instruments SN74LS series, representing low-power Schottky TTL technology. It is functionally equivalent to the industry-standard 74145 but offers improved speed and lower power consumption characteristics typical of the LS family generation.

Replacement Considerations

Compatible substitutes include the SN74LS145D and generic 74LS145 variants from other manufacturers such as ON Semiconductor or Motorola, provided they maintain the same 16-pin DIP/SOP package and electrical specifications.