Texas Instruments SN74LVC139APWR

Overview

SN74LVC139APWR 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, fully buffered inputs, and 5.5 V-tolerant inputs-used for address decoding in low-voltage microcontroller peripheral expansion and mixed-voltage I/O interfacing.

For engineers reviewing the SN74LVC139APWR datasheet, SN74LVC139APWR pinout, SN74LVC139APWR application, or SN74LVC139APWR equivalent, key selection criteria include its dual-decoder architecture with active-low enable, 3.6 V absolute max supply rating, latch-up immunity (>250 mA), and compatibility with both 3.3 V and 5 V input logic levels in translation applications.

Technical Context

This device integrates two independent 2-to-4 line decoders sharing no internal logic coupling. Each decoder features an active-low enable (G) that doubles as a data input in demultiplexing mode, supporting 1-of-4 output selection per channel. Inputs are CMOS-compatible with TTL-level thresholds and 5.5 V tolerance, enabling direct connection to legacy 5 V drivers without level shifters.

Output drive capability is ±24 mA at 3 V, with VOH ≥ 2.2 V and VOL ≤ 0.55 V under full load. The design includes robust ESD protection (2000-V HBM, 200-V MM, 1000-V CDM) and ground bounce (VOLP < 0.8 V) and undershoot (VOHV > 2 V) specifications verified at 3.3 V/25°C.

Key Specifications

Pinout & Package

TSSOP-16 (PW) package: 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height, lead-free NiPdAu (NIPDAU) or Sn (SN) 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 SN74LV139APWR and 74AHC139PW, the SN74LVC139APWR uniquely balances 1.65 V minimum operation, 5.5 V input tolerance, and 6.2 ns speed-making it optimal for modern low-voltage, mixed-signal embedded systems where supply headroom and interface flexibility are constrained.

Availability

SN74LVC139APWR is available at Aetrix Electronics and suitable for microcontroller peripheral expansion, memory address decoding, mixed-voltage logic translation, industrial I/O multiplexing, and FPGA glue logic applications requiring stable component supply and long-term manufacturability.

Supply support for SN74LVC139APWR 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 technologies, with decades of experience in logic IC design and high-volume manufacturing.

The SN74LVC139APWR belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for low-power, high-speed, mixed-voltage interoperability in space-constrained industrial, computing, and communications equipment.

FAQ

What is the maximum supply voltage for SN74LVC139APWR?

The absolute maximum supply voltage for SN74LVC139APWR is 6.5 V, but the recommended operating range is 1.65 V to 3.6 V. Operation above 3.6 V may cause parametric degradation or reliability issues. The device is rated for 5.5 V-tolerant inputs regardless of VCC, allowing safe interfacing with higher-voltage drivers while powered at 3.3 V or lower.

Does SN74LVC139APWR support demultiplexing functionality?

Yes, SN74LVC139APWR supports demultiplexing: each decoder's active-low enable (1G or 2G) serves as a data input, while A/B select lines route that signal to one of four active-low outputs (Y0–Y3). When used this way, SN74LVC139APWR converts a single data line into four time-multiplexed outputs under address control-ideal for serial-to-parallel conversion in control logic.

Can SN74LVC139APWR be used with 5 V microcontrollers?

Yes, SN74LVC139APWR accepts input voltages up to 5.5 V while operating from 1.65–3.6 V, making it compatible with 5 V microcontrollers driving its A, B, or G inputs directly. Its outputs swing from GND to VCC, so for 5 V system interfacing, ensure downstream devices tolerate 3.3 V logic levels-or add pull-up resistors if open-drain compatibility is needed.

What is the thermal resistance (θJA) of SN74LVC139APWR in its TSSOP package?

The junction-to-ambient thermal resistance (θJA) of SN74LVC139APWR in the PW (TSSOP-16) package is 108 °C/W, measured per JESD 51-7 on a standard 4-layer JEDEC test board. This value assumes no copper pour or thermal vias; actual board-level θJA can improve significantly with proper thermal land design and internal plane connections.

Is SN74LVC139APWR pin-compatible with other 74-series dual decoders?

SN74LVC139APWR is functionally and pin-compatible with SN74LV139APWR and SN74AHC139PW in the same TSSOP-16 (PW) package-same pinout, same 16-pin layout, and identical power/ground placement. However, electrical differences (VCC range, speed, drive strength) require validation in-circuit; substitution should follow schematic and timing analysis.