SN74LS47NSR

Overview

The SN74LS47NSR is a BCD-to-seven-segment decoder and driver manufactured by Texas Instruments. It belongs to the SN74LS series, utilizing Low-Power Schottky TTL technology. The device features an open-collector output configuration designed for direct driving of seven-segment displays. It operates within a supply voltage range of 4.75 V to 5.25 V and supports a standard operating temperature range from 0°C to +70°C. The component is housed in a 16-pin SOIC package, suitable for surface-mount applications.

Feature Summary

• Performs conversion of Binary-Coded Decimal inputs to active-low signals for seven-segment display illumination
• Features open-collector outputs capable of sinking current directly to drive display segments
• Includes internal blanking input functionality to suppress display output during invalid code states

Applications

• Driving common-cathode seven-segment LED numeric displays
• BCD decoding circuits in digital instrumentation panels
• Seven-segment display interfaces in embedded control systems

Procurement Notes

Verify that the specific ordering suffix corresponds to the SOIC-16 surface-mount package variant rather than through-hole options. Confirm that the target application utilizes common-cathode displays, as this device provides active-low outputs. Ensure the design accounts for the open-collector nature of the outputs when calculating necessary external pull-up resistor values for proper logic levels.

Selection Notes

Select this component when a dedicated BCD-to-seven-segment decoder with open-collector outputs is required for surface-mount assembly. It is appropriate for designs needing low-power TTL compatibility and direct segment driving without additional buffer stages. Consider alternative packages if through-hole mounting is mandated or if different output drive characteristics are necessary for the specific display load.

Part Context

This part is a surface-mount version of the SN74LS47 family, which includes BCD-to-seven-segment decoders and drivers. The 'N' designation typically indicates the PDIP package, while the 'SR' suffix denotes the SOIC tape-and-reel packaging. This specific model integrates the decoding logic and output drivers into a single integrated circuit to simplify display interface designs.

Replacement Considerations

• SN74LS47DR
• SN74LS47NE4

FAQ

What type of seven-segment display does this component support?

The SN74LS47NSR features open-collector outputs, which are designed to drive common-cathode seven-segment displays.

How does the blanking input function operate?

The blanking input allows the user to force all outputs low, effectively turning off the display segments regardless of the BCD input state.