Texas Instruments SN74LVC139APWRG4

Overview

SN74LVC139APWRG4 from Texas Instruments is a dual 2-line to 4-line decoder/demultiplexer in TSSOP-16 package, operating from 1.65 V to 3.6 V, with 6.2 ns max propagation delay at 3.3 V, ±24 mA output drive, and 5.5 V-tolerant inputs. It enables address decoding in low-voltage microcontroller systems and serves as a data selector in mixed-voltage I/O interfaces.

For engineers reviewing the SN74LVC139APWRG4 datasheet, SN74LVC139APWRG4 pinout, SN74LVC139APWRG4 application, or SN74LVC139APWRG4 equivalent, key selection criteria include its dual-decoder architecture, active-low enable per section, 3.3 V/5 V input compatibility, and TSSOP-16 thermal performance (θ_JA = 108 °C/W).

Technical Context

This device integrates two independent 2-to-4 line decoders sharing no internal logic coupling. Each decoder features fully buffered inputs, enabling clean signal fanout without loading upstream drivers. The active-low enable (G) input functions as a data path control in demultiplexing mode, allowing single-bit data routing across four outputs.

Input voltage tolerance up to 5.5 V permits direct interfacing with legacy 5 V logic while powered from 1.65–3.6 V supplies. Output VOH/VOL specifications are guaranteed across the full VCC range, supporting reliable level translation in heterogeneous voltage domains without external biasing.

Key Specifications

Pinout & Package

TSSOP-16 (PW) package, 5.0 mm × 4.4 mm × 1.2 mm height, lead pitch 0.65 mm, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 2-to-4 decoder applications.

Compared with SN74LV139A and 74AHC139, SN74LVC139APWRG4 uniquely balances 1.65 V operation, 5.5 V input tolerance, and 6.2 ns speed-making it optimal for battery-powered or mixed-supply embedded systems where voltage headroom and interface flexibility are critical.

Availability

SN74LVC139APWRG4 is available at Aetrix Electronics and suitable for memory address decoding, peripheral select logic, mixed-voltage interface design, and legacy system upgrades requiring stable component supply and long-term manufacturability.

Supply support for SN74LVC139APWRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity solutions, with decades of experience in logic IC design and automotive-grade reliability validation.

SN74LVC139APWRG4 belongs to the LVC (Low-Voltage CMOS) logic family, engineered for low-power, high-speed digital interfacing in portable, industrial, and communications equipment operating across 1.65–3.6 V rails.

FAQ

What is the maximum clock/data toggle rate supported by SN74LVC139APWRG4?

The SN74LVC139APWRG4 has a maximum propagation delay of 6.2 ns at VCC = 3.3 V, implying a theoretical maximum toggle frequency of ~80 MHz under ideal conditions. However, real-world timing must account for setup/hold times and board-level signal integrity; for reliable operation, keep input transitions below 50 MHz in typical PCB layouts with proper decoupling.

Can SN74LVC139APWRG4 be used with a 5 V microcontroller driving its inputs while powered from 3.3 V?

Yes. SN74LVC139APWRG4 inputs are rated for voltages up to 5.5 V regardless of VCC, making it safe to interface with 5 V microcontrollers while operating from a 3.3 V supply. This eliminates the need for external level-shifting circuitry and preserves signal timing integrity.

Is SN74LVC139APWRG4 pin-compatible with older 74LS139 devices?

SN74LVC139APWRG4 uses the same TSSOP-16 pinout as 74LS139 in functional equivalence (identical pin assignments for G, A, B, Y0–Y3 per decoder), but output polarity is inverted - both families provide active-low outputs. No PCB changes are required for drop-in replacement, though timing and drive strength differ significantly.

What thermal considerations apply to SN74LVC139APWRG4 in continuous operation?

With θ_JA = 108 °C/W in TSSOP-16, SN74LVC139APWRG4 dissipates <1.5 mW under typical 10 MHz toggling. At full 24 mA output load on all eight outputs, junction temperature rise remains <3 °C above ambient - no heatsinking is needed even in sealed enclosures up to +70 °C ambient.

Does SN74LVC139APWRG4 require external pull-up resistors on its outputs?

No. SN74LVC139APWRG4 outputs are push-pull and fully specified for both sourcing and sinking up to ±24 mA. Pull-up resistors are unnecessary unless open-drain behavior is intentionally desired - which this device does not support natively.