SN74AHC138PWR

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SN74AHC138PWR

IC DECODER/DEMUX 1X3:8 16TSSOP

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Specifications

Supplier Texas Instruments,Rochester Electronics, LLC
Package Tape & Reel (TR),Cut Tape (CT),Bulk
Series 74AHC
ProductStatus Active
Type Decoder/Demultiplexer
Circuit 1 x 3:8
IndependentCircuits 1
Current-OutputHighLow 8mA, 8mA
VoltageSupplySource Single Supply
Voltage-Supply 2V ~ 5.5V
OperatingTemperature -40°C ~ 85°C
MountingType Surface Mount
Package/Case 16-TSSOP (0.173, 4.40mm Width)

Overview

Description

SN74AHC138PWR is a high-speed CMOS 3-to-8 decoder/demultiplexer. It decodes three binary inputs (A, B, C) into eight active-low outputs (Y0–Y7). It has three enables: G1 (active HIGH), G2A and G2B (both active LOW). The device is enabled only if G1 = 1 and G2A = G2B = 0; then Yn is driven low for the code n = ABC and all other outputs stay high. If not enabled, all outputs are high.
Key points:
- 3-to-8 decoder with active-low outputs
- Enables: G1 (HIGH), G2A/G2B (LOW)
- Vcc typically 2.0–5.5 V; low-power CMOS
- Used for address decoding, demultiplexing, and data routing
- Package variants in 16-pin packages (e.g., SOIC/TSSOP) with PWR RoHS-compliant options
Typical timing is in the nanoseconds range and depends on Vcc.

Features

Here are the key features of SN74AHC138PWR:
- 3-to-8 line decoder/demultiplexer
- Eight active-low outputs (Y0–Y7)
- Enable inputs: G1 (active HIGH), G2A and G2B (active LOW)
- When enabled (G1=1, G2A=0, G2B=0): one output is LOW (selected by A,B,C); all others HIGH
- When disabled: all outputs HIGH
- Supply voltage range: 2.0 V to 5.5 V (AHC family)
- High-speed CMOS with low static power consumption
- PowerPAD/PowerPad package for improved thermal performance
- CMOS/TTL-compatible input thresholds; suitable for wide logic interfacing
- Commonly used for decoding and demultiplexing in memory/addressing applications
Optional: Industrial temperature range and exact package type vary by specific device variant; refer to the datasheet for packaging details.

Package

16-pin surface-mount package, PowerPAD version (PWR suffix) – TI’s exposed-pad type, typically a TSSOP-16 (or similar 16-pin SM package) for SN74AHC138PWR.

Pinout

- Pin count: 16 pins (16-pin package).
- Function: 3-to-8 line decoder/demultiplexer. Decodes inputs A, B, C to one of eight mutually exclusive outputs Y0–Y7. Features three enables: G1 (active-high) and G2A, G2B (active-low). When enabled, the selected output is driven low (active-low), others high; when not enabled, all outputs are high.

Manufacturer

Texas Instruments (TI). TI is an American multinational semiconductor company that designs and manufactures a broad range of integrated circuits, including analog, digital, and mixed-signal devices, serving many industries worldwide.

Application

- Address decoding for RAM/ROM and I/O in microprocessor/microcontroller systems
- Peripheral selection and eight-way chip-select generation on a shared bus
- Demultiplexing a 3-bit input to eight enable lines for memory/expansion devices
- Memory-mapped I/O expansion and bank switching
- Driving row/column enables in simple LED or keypad/matrix displays

Equivalent

Equivalents (3-to-8 decoder/demultiplexer): 74HC138, 74HCT138, 74ALS138, 74ACT138. Vendors include NXP (74HC138), On Semi, Renesas, etc.; these have the same function and similar pinouts in comparable TI-like packages.

Shipping

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