74HC147 (74147) IC Priority Encoder

74HC147 (74147) IC Priority Encoder

The 74HC147 (or 74147) is a 10-to-4 line priority encoder IC from the 74HC (High-Speed CMOS) logic family.
It converts decimal (0–9) inputs into binary-coded decimal (BCD) outputs.
Unlike a normal encoder, the 74HC147 is a priority encoder, meaning it assigns priority to the highest-numbered active input — if multiple inputs are active at the same time, the input with the highest priority (highest number) will be represented in the output.

This IC is typically used in keypad encoders, digital data input systems, and signal compression applications where multiple input lines need to be encoded into fewer output lines efficiently.

Click here to view related products

Features :-

Max Supply Voltage: 5.5V
Max Input Voltage: 7V
Storage Temperature Range: -65ºC to +150ºC

Functional Description

The 74HC147 encodes decimal inputs (0–9) into a 4-bit BCD output (A3–A0).
If multiple input lines are active (LOW), the IC outputs the binary code corresponding to the highest-numbered active input.

For example:
If I2 and I7 are LOW at the same time, I7 takes priority — the output corresponds to binary 0111 (7).

Applications

• Keypad encoding (0–9 keys into BCD format)
• Decimal to BCD conversion
• Data compression and line reduction
• Digital input interface for microcontrollers
• Priority interrupt encoding in CPU systems
• Address generation and selection