Decoders

Explore our complete collection of decoders with detailed technical information, datasheet and practical applications.

Available Decoders

BCD to 7-segment decoder (SN7447A)

The SN7447A is a BCD to 7-segment decoder with open collector active-low outputs, designed for common-anode displays. It includes digit on/off control and lamp test functionality. It is TTL logic equivalent to the LS47 and widely used in classic projects.

Configuration

4 BCD inputs, 7 display outputs

Type

BCD-7seg Decoder

Applications

7-segment displays, Digital counters...

Truth Table

BCD (DCBA)	Display	Segments
0000	0	abcdef
0001	1	bc
0010	2	abged
0011	3	abgcd

Datasheet and Diagram

Datasheet BCD to 7-segment decoder (SN7447A) - SN7447A

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BCD to 7-segment decoder (SN7448)

The SN7448 is similar to the SN7447 but with active-high outputs for common-cathode displays. It includes internal pull-up resistors and can directly drive LEDs without external resistors.

Configuration

4 BCD inputs, 7 display outputs

Type

BCD-7seg Decoder

Applications

Common-cathode displays, Digital instruments...

Datasheet and Diagram

Datasheet BCD to 7-segment decoder (SN7448) - SN7448

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3-to-8 line decoder (SN74LS138)

The SN74LS138 is a 3-to-8 line decoder/demultiplexer. It takes 3 selection bits and activates one of 8 outputs. It has 3 enable inputs, ideal for addressing chips or expanding control lines. Popular in digital electronics for TTL compatibility and low cost.

Configuration

3 selection inputs, 8 outputs

Type

3-to-8 Decoder

Applications

Memory addressing, Data demultiplexing...

Truth Table

G1	G2A	G2B	C	B	A	Y0	Y1-Y7
H	L	L	L	L	L	L	H
H	L	L	L	L	H	L	H
H	L	L	L	H	L	L	H

Datasheet and Diagram

Datasheet 3-to-8 line decoder (SN74LS138) - SN74LS138

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