Texas Instruments SN74LVC139APWT

Overview

SN74LVC139APWT from Texas Instruments is a dual 2-line to 4-line decoder/demultiplexer in a 16-pin TSSOP (PW) package, operating from 1.65 V to 3.6 V, with max propagation delay of 6.2 ns at 3.3 V and inputs tolerant to 5.5 V. It supports mixed-voltage translation between 3.3-V and 5-V logic domains and features fully buffered inputs for low capacitive loading.

For engineers reviewing the SN74LVC139APWT datasheet, SN74LVC139APWT pinout, SN74LVC139APWT application, or SN74LVC139APWT equivalent, key selection criteria include voltage-level translation capability, low-power 1.65–3.6 V operation, fast 6.2 ns tpd, latch-up immunity (>250 mA), and compatibility with industrial temperature range (–40°C to 85°C).

Technical Context

This device integrates two independent 2-to-4 line decoders, each with active-low enable (G) that doubles as a data input in demultiplexing mode. Inputs accept voltages up to 5.5 V while powered from 1.65–3.6 V, enabling seamless interfacing across mixed-supply systems.

Each decoder implements standard binary decoding logic with four active-high outputs (Y0–Y3); all outputs are high when enable is inactive (G = H). Fully buffered inputs present only one normalized load, minimizing drive burden on upstream logic.

Key Specifications

Pinout & Package

The SN74LVC139APWT is housed in a 16-pin Thin Shrink Small Outline Package (TSSOP, PW), 4.4 mm × 5.0 mm body, 1.2 mm max height, 0.65 mm lead pitch, with gull-wing leads and exposed pad not present. Pin 1 marked by index area in top-left corner.

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, the SN74LVC139APWT uniquely supports 1.65-V operation and 5.5-V tolerant inputs - making it the only choice for mixed-supply, ultra-low-voltage, or legacy-interface applications where pin count and footprint are constrained.

Availability

SN74LVC139APWT is available at Aetrix Electronics and suitable for memory address decoding, peripheral select logic, logic level translation, and industrial I/O expansion requiring stable component supply, consistent TSSOP-PW packaging, and guaranteed industrial temperature compliance.

Supply support for SN74LVC139APWT 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 delivering analog and embedded processing solutions, with over 90 years of innovation in logic, power management, and signal chain technologies.

The SN74LVC139APWT belongs to TI's LVC (Low-Voltage CMOS) logic family, designed specifically for high-speed, low-power, mixed-voltage interface applications in industrial, communications, and computing systems.

FAQ

What is the absolute maximum supply voltage for SN74LVC139APWT?

The absolute maximum VCC rating for SN74LVC139APWT is 6.5 V, but recommended operation is strictly limited to 1.65 V to 3.6 V per datasheet specifications. Exceeding 3.6 V may cause parametric degradation or accelerated wear-out, even if below the absolute limit. Always operate SN74LVC139APWT within its recommended VCC range to ensure timing compliance and long-term reliability.

Can SN74LVC139APWT safely interface with 5-V microcontroller outputs?

Yes - SN74LVC139APWT inputs tolerate up to 5.5 V regardless of VCC level, allowing direct connection to 5-V GPIOs without external resistors or level shifters. This feature is explicitly validated in the datasheet under "Inputs Accept Voltages to 5.5 V". The SN74LVC139APWT maintains correct logic interpretation and does not draw excessive current when driven by 5-V sources.

Does SN74LVC139APWT have built-in ESD protection?

Yes - SN74LVC139APWT exceeds JESD22-A114 (2000-V HBM), JESD22-A115 (200-V MM), and JESD22-C101 (1000-V CDM) ESD standards. These ratings are measured and guaranteed per TI's production test flow, ensuring robust handling during assembly and operation in electrostatic-prone industrial environments. No external ESD diodes are required for typical board-level protection when using SN74LVC139APWT.

What is the thermal resistance θJA for SN74LVC139APWT in its TSSOP package?

The junction-to-ambient thermal resistance (θJA) for SN74LVC139APWT in the PW (TSSOP) package is 108°C/W, measured per JESD51-7 on a standard 4-layer JEDEC test board. This value assumes natural convection and defines the worst-case temperature rise under full-output switching. For sustained high-current operation, thermal relief pads or local copper pours are recommended to improve heat dissipation beyond the baseline θJA of SN74LVC139APWT.

Is SN74LVC139APWT pin-compatible with other packages of the same part number?

No - SN74LVC139APWT (TSSOP-PW) shares identical logic function and pin numbering with SN74LVC139ADR (SOIC-D) and SN74LVC139ADBR (SSOP-DB), but mechanical dimensions, lead pitch, and solder footprint differ significantly. While electrical pinout matches across packages, PCB layout must be redesigned for each package type. SN74LVC139APWT requires a 0.65 mm pitch land pattern distinct from SOIC's 1.27 mm pitch - direct substitution without board revision is not possible.