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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments SN74LVC139APWE4

Name: SN74LVC139APWE4
Brand: Texas Instruments
SKU: SN74LVC139APWE4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVC139APWE4

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-TSSOP (0.173", 4.40mm Width)

Datasheet:: SN74LVC139APWE4.pdf

Description:: IC DECODER/DEMUX 1X2:4 16TSSOP

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Product details

Overview

SN74LVC139APWE4 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 max propagation delay of 6.2 ns at 3.3 V, input tolerance up to 5.5 V, and latch-up immunity exceeding 250 mA per JESD 17. It serves as address decoder in low-voltage microcontroller peripheral expansion and level-translating demux in mixed 3.3 V/5 V logic systems.

For engineers reviewing the SN74LVC139APWE4 datasheet, SN74LVC139APWE4 pinout, SN74LVC139APWE4 application, or SN74LVC139APWE4 equivalent, key selection criteria include its dual-decoder architecture with active-low enables, 16-pin TSSOP thermal performance (θ_JA = 108 °C/W), output drive capability (±24 mA at 3 V), and compatibility with both 3.3 V and 5 V input sources without external level shifters.

Technical Context

This device integrates two independent 2-to-4 line decoders sharing no internal logic-each has dedicated select inputs (A, B), active-low enable (G), and four active-low outputs (Y0–Y3). The fully buffered inputs present only one normalized load, minimizing fanout burden on driving circuits.

Its input voltage tolerance (–0.5 V to 5.5 V) and rail-to-rail output swing (0 V to V_CC) enable bidirectional voltage translation between 3.3 V and 5 V domains. The device exhibits low ground bounce (<0.8 V) and undershoot (>2 V) at 3.3 V, supporting noise-resilient operation in dense digital layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65 V to 3.6 V - Enables direct integration into modern low-power 1.8 V, 2.5 V, and 3.3 V logic systems without level-shifting circuitry.
Max t_pd	6.2 ns at V_CC = 3.3 V - Supports high-speed address decoding in sub-160 MHz synchronous bus applications.
Input Voltage Range	–0.5 V to 5.5 V - Allows safe interfacing with legacy 5 V TTL outputs while powered from 3.3 V supply.
I_OL/I_OH	±24 mA at V_CC = 3 V - Drives multiple LVC/LVT inputs or small LED loads directly without buffer stages.
Latch-Up Immunity	>250 mA per JESD 17 - Ensures robustness against transient current faults in industrial control I/O modules.
Power Dissipation Cap.	30.5 pF at 3.3 V - Predictable dynamic loading for accurate timing margin analysis in clocked decode paths.

Pinout & Package

TSSOP-16 package (PW), 5.0 mm × 4.4 mm × 1.2 mm body, 0.65 mm lead pitch, exposed pad not present, JEDEC MO-153 compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 15, 16	GND, V_CC, 2G	Ground reference, power supply, and second decoder enable - shared V_CC/GND reduce supply noise coupling between decoders.
2, 3, 4	1A, 1B, 1G	First decoder's select lines and active-low enable - G input doubles as data input in demux mode, enabling 1-bit-to-4-bit distribution.
5–8	1Y0–1Y3	Active-low decoded outputs - each sinks 24 mA; open-drain behavior when disabled (high-impedance state).
9, 10, 11	2A, 2B, 2G	Second independent decoder's controls - electrically isolated from first decoder; supports parallel address decoding or dual-channel routing.
12–14	2Y0–2Y3	Second decoder's active-low outputs - identical timing and drive strength to Y0–Y3; enables simultaneous dual-bank memory selection.

Key Features

Feature	Design Value
Dual independent decoders	Two functionally isolated 2-to-4 decoders share only V_CC/GND - eliminates crosstalk in multi-bank memory or peripheral select logic.
5.5 V-tolerant inputs	Accepts 5 V logic signals while powered at 1.65–3.6 V - eliminates external translators in mixed-voltage FPGA or MCU interface designs.
Low propagation delay	6.2 ns max at 3.3 V - meets setup/hold timing for 100+ MHz address buses in embedded controllers and SoC peripherals.
High noise immunity	V_OH undershoot >2 V and V_OL bounce <0.8 V at 3.3 V - maintains signal integrity in noisy motor-control or power-supply proximity layouts.
JESD 17 latch-up rating	>250 mA - withstands ESD-induced current surges during hot-plug or cable-disconnect events in industrial I/O modules.

Applications

Memory Address Decoding	Peripheral Select Logic
Use Scenario: Selecting among four SRAM or EEPROM chips in an 8-bit microcontroller system with limited address lines. IC Role / Device Role / Timing Role: Dual decoder maps A0–A1 to chip-select lines for four memory banks; enables bank switching without CPU wait states. Use Value: Reduces PCB footprint vs. discrete gates; 6.2 ns delay ensures full-speed access at 16 MHz bus clocks.	Use Scenario: Routing UART, SPI, and I²C peripherals from a single microcontroller port with shared address/data bus. IC Role / Device Role / Timing Role: Acts as peripheral selector - G inputs driven by higher-order address bits, outputs enable specific peripheral CS pins. Use Value: Eliminates need for programmable logic; 5.5 V-tolerant inputs accept legacy 5 V controller address signals.
Level-Translating Demux	LED Segment Driver Enable
Use Scenario: Distributing a single 5 V control signal from an older MCU to four 3.3 V logic subsystems. IC Role / Device Role / Timing Role: Functions as demultiplexer - 5 V data applied to G input, 3.3 V selects (A/B) route it to one of four 3.3 V outputs. Use Value: Achieves voltage translation without resistive dividers or MOSFETs; maintains fast edge rates (≤6.2 ns).	Use Scenario: Enabling individual 7-segment LED displays in a multiplexed display driver using common-anode configuration. IC Role / Device Role / Timing Role: Drives segment common-anode enable lines - active-low outputs sink current directly from LED anodes. Use Value: ±24 mA drive per output powers up to 8 mA/segment LEDs without external transistors; low V_OL minimizes dropout loss.

Memory Address Decoding

Peripheral Select Logic

Use Scenario: Selecting among four SRAM or EEPROM chips in an 8-bit microcontroller system with limited address lines.

IC Role / Device Role / Timing Role: Dual decoder maps A0–A1 to chip-select lines for four memory banks; enables bank switching without CPU wait states.

Use Value: Reduces PCB footprint vs. discrete gates; 6.2 ns delay ensures full-speed access at 16 MHz bus clocks.

Use Scenario: Routing UART, SPI, and I²C peripherals from a single microcontroller port with shared address/data bus.

IC Role / Device Role / Timing Role: Acts as peripheral selector - G inputs driven by higher-order address bits, outputs enable specific peripheral CS pins.

Use Value: Eliminates need for programmable logic; 5.5 V-tolerant inputs accept legacy 5 V controller address signals.

Level-Translating Demux

LED Segment Driver Enable

Use Scenario: Distributing a single 5 V control signal from an older MCU to four 3.3 V logic subsystems.

IC Role / Device Role / Timing Role: Functions as demultiplexer - 5 V data applied to G input, 3.3 V selects (A/B) route it to one of four 3.3 V outputs.

Use Value: Achieves voltage translation without resistive dividers or MOSFETs; maintains fast edge rates (≤6.2 ns).

Use Scenario: Enabling individual 7-segment LED displays in a multiplexed display driver using common-anode configuration.

IC Role / Device Role / Timing Role: Drives segment common-anode enable lines - active-low outputs sink current directly from LED anodes.

Use Value: ±24 mA drive per output powers up to 8 mA/segment LEDs without external transistors; low V_OL minimizes dropout loss.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LV139ADR	Wider V_CC range (2.0–5.5 V); slower max t_pd (12.5 ns at 5 V); LV family, not LVC.	Better suited for pure 5 V systems; lacks 1.65 V operation and 5.5 V input tolerance of LVC variant.	Choose if system runs exclusively at 5 V and cost sensitivity outweighs speed/voltage flexibility.
74AHC139PW	Higher V_CC range (2.0–5.5 V); faster t_pd (5.1 ns at 5 V); AHC logic, not LVC.	Requires ≥2.0 V supply; incompatible with 1.65–1.95 V operation; no 5.5 V input tolerance.	Select when 5 V operation and sub-5.5 ns delay are mandatory, and 5.5 V input tolerance is unnecessary.

Compared with SN74LV139ADR and 74AHC139PW, SN74LVC139APWE4 uniquely supports 1.65 V operation and 5.5 V-tolerant inputs - critical for battery-powered IoT nodes interfacing legacy 5 V sensors while maintaining ultra-low standby current.

Availability

SN74LVC139APWE4 is available at Aetrix Electronics and suitable for memory address decoding, peripheral select logic, level-translating demux, and LED segment driver enable applications requiring stable component supply across industrial, automotive, and embedded design cycles.

Supply support for SN74LVC139APWE4 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 logic solutions, with over 50 years of innovation in high-reliability logic interfaces and power-efficient ICs.

SN74LVC139APWE4 belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for mixed-voltage system interoperability, low dynamic power, and robust ESD/latch-up performance in space-constrained industrial and portable electronics.

FAQ

What is the maximum operating frequency supported by SN74LVC139APWE4?

The SN74LVC139APWE4 does not specify a maximum clock frequency; instead, its 6.2 ns maximum propagation delay at 3.3 V implies reliable operation in address decode paths with ≤160 MHz toggle rates. Timing margins must be verified against actual board trace lengths, load capacitance, and signal slew rates - the device itself imposes no hard frequency ceiling beyond its t_pd-based setup/hold constraints.

Can SN74LVC139APWE4 safely interface a 5 V microcontroller with a 3.3 V FPGA?

Yes. SN74LVC139APWE4 accepts input voltages up to 5.5 V while operating from a 3.3 V supply, making it ideal for translating 5 V address/control signals from legacy microcontrollers to 3.3 V FPGA I/O banks. Its outputs swing rail-to-rail (0 V to 3.3 V), ensuring compatible logic levels for the FPGA inputs without external components.

Does SN74LVC139APWE4 require pull-up resistors on its outputs?

No. SN74LVC139APWE4 features push-pull outputs - not open-drain - so pull-ups are unnecessary for standard logic-level generation. Outputs actively drive high (to V_CC) or low (to GND). Pull-ups would only be needed if intentionally overriding the output state (e.g., wired-OR bus), which contradicts the device's intended use case.

What is the thermal resistance (θ_JA) of the SN74LVC139APWE4 in its TSSOP-16 package?

The SN74LVC139APWE4 in the PW (TSSOP-16) package has a junction-to-ambient thermal resistance (θ_JA) of 108 °C/W under standard JEDEC test conditions. This value assumes a 1-inch² copper pad with two vias; actual board layout significantly impacts real-world thermal performance - adding thermal relief or extra copper improves heat dissipation.

Is SN74LVC139APWE4 pin-compatible with other variants like SN74LVC139ADR or SN74LVC139APWR?

Yes. All SN74LVC139A variants - including SN74LVC139ADR (SOIC), SN74LVC139APWR (TSSOP reel), and SN74LVC139APWE4 (TSSOP tube) - share identical 16-pin functional pinout and electrical behavior. Mechanical differences (package size, lead form, packaging) do not affect circuit design; only PCB footprint and assembly process differ.

SN74LVC139APWE4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVC

Package/Case:: 16-TSSOP (0.173", 4.40mm Width)

Packaging:: Tube

Product Status:: Discontinued at Digi-Key

Type:: Decoder/Demultiplexer

Circuit:: 1 x 2:4

Independent Circuits:: 2

Current - Output High, Low:: 24mA, 24mA

Voltage Supply Source:: Single Supply

Voltage - Supply:: 1.65V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-TSSOP

SN74LVC139APWE4 FAQ

1.How can I place an order for SN74LVC139APWE4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVC139APWE4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SN74LVC139APWE4 reliable?

The price and inventory of SN74LVC139APWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC139APWE4 is usually 5 days.

3.What payment methods are accepted for SN74LVC139APWE4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC139APWE4 transactions.

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SN74LVC139APWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVC139APWE4 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SN74LVC139APWE4?

For technical support, including SN74LVC139APWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC139APWE4 requirements.

6.How does Aetrix verify that SN74LVC139APWE4 is sourced from the original manufacturer or authorized distributors?

All SN74LVC139APWE4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74LVC139APWE4 meets industry standards.

7.What is the process for return or replacement of SN74LVC139APWE4?

All SN74LVC139APWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC139APWE4, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SN74LVC139APWE4 part is unused and in its original packaging.

Return procedure for SN74LVC139APWE4:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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