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

Texas Instruments SN74AHCT139DGVR

Name: SN74AHCT139DGVR
Brand: Texas Instruments
SKU: SN74AHCT139DGVR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74AHCT139DGVR

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

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

Datasheet:: SN74AHCT139DGVR.pdf

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

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Product details

Overview

SN74AHCT139DGVR from Texas Instruments is a dual 2-line-to-4-line decoder/demultiplexer in TVSOP-16 package, operating at 4.5–5.5 V, with propagation delays as low as 1 ns (t_PLH/t_PHL at 15 pF), TTL-compatible inputs, and ±8 mA output drive. It enables high-speed memory decoding and data routing in compact board designs.

For engineers reviewing the SN74AHCT139DGVR datasheet, SN74AHCT139DGVR pinout, SN74AHCT139DGVR application, or SN74AHCT139DGVR equivalent, key selection criteria include its 16-pin TVSOP footprint, dual independent enable-controlled decoding paths, guaranteed 1 ns minimum propagation delay at 5 V/15 pF, and 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 (1G, 2G) and complementary select inputs (A/B). Each decoder drives four active-low outputs (Y0–Y3), supporting both decoding and demultiplexing modes via G input as data line.

It uses AHCT logic family architecture-TTL-input compatible with CMOS output characteristics-ensuring interoperability with legacy TTL systems while delivering rail-to-rail switching, low static current (<20 µA), and latch-up immunity exceeding 250 mA per JESD 17.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.5 V to 5.5 V - Ensures compatibility with standard 5-V logic rails and tolerates supply variation without functional degradation.
t_PLH/t_PHL (15 pF)	1 ns (min) / 8.5 ns (max) - Enables sub-10 ns system-level address decoding critical for fast SRAM and EPROM interfaces.
I_OH/I_OL	–8 mA / +8 mA - Sufficient to directly drive multiple 74-series inputs or small LED loads without external buffers.
V_IH/V_IL	2.0 V / 0.8 V - Matches TTL voltage thresholds, allowing direct connection to 74LS/74F outputs without level shifters.
Operating Temperature	–40°C to +85°C - Qualified for industrial-grade embedded control, instrumentation, and communications equipment.
Power Dissipation Cap.	13 pF - Low dynamic power consumption supports dense PCB layouts with minimal thermal impact.

Pinout & Package

SN74AHCT139DGVR is housed in a 16-pin Thin Very Small Outline Package (TVSOP, DGV), 4.4 mm × 3.6 mm, 1.2 mm max height, with 0.65 mm pitch, lead-free (NIPDAU), MSL Level-1, and exposed pad not present.

Pin/Terminal	Circuit Role	Design Meaning
1G, 2G	Active-low enable inputs	Gate each decoder independently; tied together or controlled separately for cascaded decoding or time-multiplexed data routing.
1A, 1B / 2A, 2B	Binary address inputs	Select one of four outputs per decoder (Y0–Y3); fully buffered to minimize loading on upstream drivers.
1Y0–1Y3 / 2Y0–2Y3	Active-low decoded outputs	Assert low on selected output only; all others remain high - ideal for enabling memory chips or peripheral select lines.
V_CC, GND	Power supply terminals	Single 5-V supply; requires local 0.1 µF ceramic decoupling adjacent to Pin 16 (V_CC) and Pin 8 (GND).
NC	No internal connection	Pins 3, 7, 11, and 15 are unconnected - must be left floating or tied to GND for mechanical stability (not electrically required).

Key Features

Feature	Design Value
Dual independent decoders	Two fully isolated 2-to-4 decoding blocks share only V_CC/GND - eliminates inter-channel timing skew in multi-bank memory systems.
TTL-compatible inputs	VIH = 2.0 V, VIL = 0.8 V - Interoperates with legacy 74LS, 74F, and microcontroller GPIOs without level translation.
Low propagation delay	1 ns min t_PLH/t_PHL at 5 V/15 pF - Reduces worst-case address decode latency below typical fast SRAM access times (e.g., <10 ns).
Latch-up immunity	Exceeds 250 mA per JESD 17 - Ensures robustness against transient overcurrent events in noisy industrial environments.
ESD protection	2000-V HBM, 200-V MM, 1000-V CDM - Meets IEC 61000-4-2 pre-compliance requirements for handling and board assembly.

Applications

Memory Address Decoding	Peripheral Select Logic
Use Scenario: Selecting one of four SRAM or Flash memory banks in a microcontroller-based data logger. IC Role / Device Role / Timing Role: Dual decoder routes A0–A1 address bits to assert individual /CS lines for up to four memory devices, synchronized with /OE timing. Use Value: Eliminates need for discrete logic or larger CPLDs; 1 ns min delay ensures no added wait states in 50-MHz bus cycles.	Use Scenario: Enabling specific UART, ADC, or DAC peripherals in an industrial PLC backplane. IC Role / Device Role / Timing Role: Acts as address-select matrix translating two-bit slot ID into dedicated /EN signal per peripheral module. Use Value: Supports hot-swap-safe enable sequencing via independent 1G/2G controls; ±8 mA drive handles optocoupler LED bias directly.
Data Demultiplexing	Logic State Translation
Use Scenario: Distributing a single serial control bit to four independent reset lines in a sensor fusion subsystem. IC Role / Device Role / Timing Role: Uses active-low G input as data line while A/B select destination channel - true 1-to-4 demux operation. Use Value: Achieves glitch-free channel selection with no external inverters; propagation delay matched across all Y outputs.	Use Scenario: Converting TTL-level status signals from legacy sensors into CMOS-compatible enable inputs for modern ASICs. IC Role / Device Role / Timing Role: Provides level-shifting and fanout amplification: one TTL input drives four CMOS loads with rail-to-rail swing. Use Value: Replaces discrete transistor translators; VIH/VIL thresholds guarantee noise margin >0.4 V in mixed-voltage systems.

Memory Address Decoding

Peripheral Select Logic

Use Scenario: Selecting one of four SRAM or Flash memory banks in a microcontroller-based data logger.

IC Role / Device Role / Timing Role: Dual decoder routes A0–A1 address bits to assert individual /CS lines for up to four memory devices, synchronized with /OE timing.

Use Value: Eliminates need for discrete logic or larger CPLDs; 1 ns min delay ensures no added wait states in 50-MHz bus cycles.

Use Scenario: Enabling specific UART, ADC, or DAC peripherals in an industrial PLC backplane.

IC Role / Device Role / Timing Role: Acts as address-select matrix translating two-bit slot ID into dedicated /EN signal per peripheral module.

Use Value: Supports hot-swap-safe enable sequencing via independent 1G/2G controls; ±8 mA drive handles optocoupler LED bias directly.

Data Demultiplexing

Logic State Translation

Use Scenario: Distributing a single serial control bit to four independent reset lines in a sensor fusion subsystem.

IC Role / Device Role / Timing Role: Uses active-low G input as data line while A/B select destination channel - true 1-to-4 demux operation.

Use Value: Achieves glitch-free channel selection with no external inverters; propagation delay matched across all Y outputs.

Use Scenario: Converting TTL-level status signals from legacy sensors into CMOS-compatible enable inputs for modern ASICs.

IC Role / Device Role / Timing Role: Provides level-shifting and fanout amplification: one TTL input drives four CMOS loads with rail-to-rail swing.

Use Value: Replaces discrete transistor translators; VIH/VIL thresholds guarantee noise margin >0.4 V in mixed-voltage systems.

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
SN74HC139DR	CMOS input thresholds (VIH = 3.15 V), slower t_PHL (19 ns max @ 5 V/15 pF), lower I_OL (±4 mA)	Not suitable for direct TTL interface; requires pull-ups or buffer for 74LS sources; higher delay limits use in >25-MHz systems.	Choose when cost sensitivity outweighs speed/TTL compatibility and system operates exclusively with CMOS drivers.
SN74LV139ADR	Lower V_CC range (2–5.5 V), LV logic family, VIH = 1.7 V, t_PHL = 11 ns max @ 3.3 V/15 pF	Optimized for 3.3-V domains; incompatible with 5-V TTL inputs without clamping; better for mixed-voltage FPGA I/O banks.	Prefer for new 3.3-V designs where supply headroom is constrained and legacy TTL interfacing is absent.

Compared with SN74HC139DR and SN74LV139ADR, SN74AHCT139DGVR uniquely delivers TTL input compatibility, sub-10 ns propagation, and industrial temperature support in a space-saving TVSOP package - making it the only choice for retrofitting 5-V legacy systems requiring zero-layout change and guaranteed timing margins.

Availability

SN74AHCT139DGVR is available at Aetrix Electronics and suitable for industrial control panels, test equipment front-ends, and communication interface modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for SN74AHCT139DGVR 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 decades of heritage in industry-standard logic families.

The SN74AHCT139DGVR belongs to TI's AHCT advanced high-speed CMOS logic series, engineered specifically for seamless integration between TTL-based legacy systems and modern 5-V digital architectures.

FAQ

What is the maximum clock/data frequency supported by SN74AHCT139DGVR?

The SN74AHCT139DGVR is not a clocked device but a combinational decoder; its usable frequency depends on propagation delay and load capacitance. With 15 pF load, t_PHL ≤ 8.5 ns allows reliable operation up to ~60 MHz toggle rate on enable or address inputs - sufficient for most 5-V memory and peripheral bus applications. The SN74AHCT139DGVR does not specify a maximum clock frequency because it has no internal clock.

Can SN74AHCT139DGVR drive LEDs directly?

Yes - the SN74AHCT139DGVR provides ±8 mA output drive per Y pin, enough to illuminate standard 2-mA indicator LEDs with appropriate current-limiting resistors (e.g., 330 Ω at 5 V). Its active-low outputs sink current when asserted, simplifying LED anode-to-V_CC connections. Ensure total I_CC remains below 75 mA and derate for ambient temperature per datasheet thermal limits.

Is SN74AHCT139DGVR pin-compatible with SN74HC139 in TVSOP package?

No - SN74HC139 is not offered in TVSOP (DGV) package; its common variants are SOIC (D) and TSSOP (PW). While the logic function and pinout match across SN74x139 family members in same package type, SN74AHCT139DGVR's TVSOP-16 footprint has different dimensions and pitch than SOIC/TSSOP. Direct replacement requires PCB redesign unless using SN74AHCT139PWR (TSSOP) instead.

Does SN74AHCT139DGVR require external pull-up resistors on outputs?

No - SN74AHCT139DGVR features totem-pole (push-pull) outputs, not open-drain. Outputs actively drive both HIGH and LOW states. Pull-ups are unnecessary and may cause contention or excessive current if connected to V_CC while output is LOW. Only unused inputs (A, B, G) must be terminated to V_CC or GND per TI application note SCBA004.

What is the thermal resistance (θ_JA) of SN74AHCT139DGVR in its TVSOP package?

The junction-to-ambient thermal resistance (θ_JA) for SN74AHCT139DGVR in TVSOP (DGV) package is 120°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC 2-layer board conditions (1-inch² copper pad). For sustained operation near I_OL = 8 mA on multiple outputs, keep ambient temperature ≤70°C or add local copper pour to reduce effective θ_JA.

SN74AHCT139DGVR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74AHCT

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Decoder/Demultiplexer

Circuit:: 1 x 2:4

Independent Circuits:: 2

Current - Output High, Low:: 8mA, 8mA

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-TVSOP

SN74AHCT139DGVR FAQ

1.How can I place an order for SN74AHCT139DGVR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74AHCT139DGVR 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 SN74AHCT139DGVR reliable?

The price and inventory of SN74AHCT139DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT139DGVR is usually 5 days.

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SN74AHCT139DGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74AHCT139DGVR 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 SN74AHCT139DGVR?

For technical support, including SN74AHCT139DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT139DGVR requirements.

6.How does Aetrix verify that SN74AHCT139DGVR is sourced from the original manufacturer or authorized distributors?

All SN74AHCT139DGVR 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 SN74AHCT139DGVR meets industry standards.

7.What is the process for return or replacement of SN74AHCT139DGVR?

All SN74AHCT139DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT139DGVR, 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 SN74AHCT139DGVR part is unused and in its original packaging.

Return procedure for SN74AHCT139DGVR:

1.Submit a request within 90 days.

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

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