SN74LS145DG4

Overview

The SN74LS145DG4 is a Low-power Schottky (LS) BCD-to-decimal decoder/driver manufactured by Texas Instruments. It accepts four binary-coded decimal inputs and activates one of ten active-low outputs corresponding to the input value. The device features open-collector outputs capable of sinking up to 80 mA, allowing direct drive for indicators or relays. It operates on a single 5 V supply within a voltage range of 4.75 V to 5.25 V. Key electrical parameters include a propagation delay of 50 ns and a bandwidth of 35 MHz. It is housed in a 16-pin SOIC package with an operating temperature range of 0°C to 70°C.

Feature Summary

• Accepts binary-coded decimal inputs to activate specific decimal outputs
• Features open-collector outputs for high current sinking capability
• Designed for compatibility with standard TTL logic families

Applications

• Driving 10-digit incandescent display panels
• Indicator and relay driver circuits
• Open-collector logic circuit interfacing

Procurement Notes

Verify the exact suffix 'DG4' against the manufacturer's official documentation to confirm RoHS compliance status and specific package dimensions. Ensure the selected variant matches the required surface-mount configuration and thermal characteristics for your specific application environment.

Selection Notes

Select this component when a BCD-to-decimal translation with high-current sinking capability is required. The open-collector design allows flexibility in output voltage levels. Verify that the load current does not exceed the 80 mA limit per output and that the system operates within the specified 0°C to 70°C temperature range.

Part Context

This part belongs to the Texas Instruments SN74LS series, known for low power consumption compared to standard TTL. The SN74LS145 specifically addresses applications requiring decoding of 4-bit binary data into one-of-ten active signals. It serves as a bridge between digital control logic and higher-current analog loads like lamps or mechanical relays.

Replacement Considerations

SN74LS145N: Pin-compatible through-hole alternative from Texas Instruments.