SN74ACT139BQBR

Signal Switches, Multiplexers, Decoders Overview

The SN74ACT139BQBR is a dual 2-to-4 decoder/demultiplexer from the Texas Instruments ACT logic family. It operates within a supply voltage range of 4.5V to 5.5V and features TTL-compatible inputs. The device provides balanced CMOS push-pull outputs capable of continuous ±24mA drive at 5V, with short burst support up to ±75mA. Maximum propagation delays are 10.2ns for address-to-output transitions and 10.4ns for strobe-to-output transitions. It functions in an ambient temperature range of -40°C to +125°C and is housed in a 16-pin WQFN package.

Signal Switches, Multiplexers, Decoders Feature Summary

• Contains two independent 2-to-4 decoders or demultiplexers with active-low output strobes.
• Features TTL-compatible CMOS inputs designed for direct interfacing with standard logic devices.
• Includes balanced CMOS push-pull outputs for efficient sourcing and sinking of current.
• Capable of driving 50Ω transmission lines and supporting high-speed data routing applications.

Signal Switches, Multiplexers, Decoders Applications

• Memory device selection with shared data bus
• Reducing required number of outputs for chip select applications
• Routing data

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify that the specific BQB package variant matches the design footprint requirements. Confirm the operating temperature range aligns with system thermal constraints. Ensure input signals transition rapidly to prevent oscillation due to the TTL-compatible nature of the inputs. Validate power supply decoupling near the VCC pin as recommended for this logic family.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when dual independent decoding channels are required within a single package. The ACT series offers faster switching speeds compared to standard AC logic while maintaining CMOS low power characteristics. Verify that the 16-pin WQFN package fits the available PCB area and thermal dissipation capabilities of the target application environment.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SN74ACT139 family of dual decoders. It shares functional compatibility with other variants like the SN74ACT139PWR but differs in physical packaging. The BQB designation indicates a 16-pin WQFN form factor, suitable for space-constrained surface-mount designs requiring robust thermal performance.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74ACT139PWR