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Texas Instruments SN74LV139ANS
- Part No.:
- SN74LV139ANS
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SN74LV139ANS.pdf
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- DECODER/DRIVER
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Product details
Overview
SN74LV139ANS from Texas Instruments is a dual 2-line-to-4-line decoder/demultiplexer in SO package (NS), operating from 2 V to 5.5 V, with max propagation delay of 7.5 ns at 5 V, fully buffered inputs, and Ioff support for partial-power-down mode. It serves in high-speed memory decoding and data-routing systems where low-latency address selection is critical.
For engineers reviewing the SN74LV139ANS datasheet, SN74LV139ANS pinout, SN74LV139ANS application, or SN74LV139ANS equivalent, this page delivers verified functional identity, confirmed NS-package pin mapping, real-world timing behavior across VCC, Ioff-enabled power sequencing capability, and validated alternative options for memory interface and logic routing designs.
Technical Context
The SN74LV139ANS integrates two independent decoders, each with active-low enable (G) and dual address inputs (A, B), producing four active-low decoded outputs (Y0–Y3). Its fully buffered inputs present only one normalized load, minimizing fanout burden on upstream drivers.
It supports mixed-mode voltage operation: inputs tolerate voltages up to 5.5 V regardless of VCC, enabling interfacing with higher-voltage logic while powered from 2.3–3.6 V supplies. The Ioff circuit actively disables outputs during power-down, preventing backflow current when VCC = 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - enables direct interface with 2.5 V, 3.3 V, and 5 V logic domains without level shifters |
| Max tpd @ 5 V | 7.5 ns - ensures sub-8 ns address decode latency in fast SRAM/ROM systems |
| Ioff Support | Yes - blocks output current flow during partial power-down, protecting powered-down sections |
| Input Clamp Current | −20 mA - limits damage from transient overvoltage on address/control lines |
| Output Drive @ 3.3 V | ±6 mA - sufficient to drive 10–15 pF loads typical in PCB traces and CMOS inputs |
| ESD Protection | HBM 2000 V, MM 200 V, CDM 1000 V - meets industrial-grade robustness requirements |
Pinout & Package
SN74LV139ANS uses a 16-pin SO (Small Outline) package per NS drawing, with 1.27 mm pitch, 10.2 mm × 5.3 mm body, and gull-wing leads. Pin 1 is marked by notch or bevel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-low enable input | Disables all outputs (Y0–Y3) when high; used as data line in demux mode |
| 1A, 1B / 2A, 2B | Address inputs | Binary-selects one of four active-low outputs per decoder section |
| 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs | Each Yx asserts low when corresponding G=low and AB matches index x |
| VCC (Pin 16) | Positive supply | Supplies both decoder sections; must be decoupled locally with 0.1 μF ceramic |
| GND (Pin 8) | Ground reference | Common return path for all internal logic and output currents |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables simultaneous address decoding for two memory banks or peripheral groups |
| Mixed-mode voltage operation | Accepts 5.5 V inputs while VCC = 2.5 V - eliminates external level translators in hybrid-voltage systems |
| Ioff partial-power-down | Prevents damaging back-current when VCC is off but bus lines remain active - essential for hot-swap and power-gated designs |
| Low propagation delay | 7.5 ns max at 5 V ensures decoder delay contributes negligibly to memory access time in high-performance systems |
| High latch-up immunity | >250 mA per JESD17 - withstands transient faults in industrial control and instrumentation environments |
Applications
| Memory Address Decoding | Peripheral Select Logic |
|---|---|
Use Scenario: Selecting one of four SRAM chips in a 16-bit microcontroller system using A1–A0 address bits. IC Role / Device Role / Timing Role: Dual decoder maps two address lines to four chip-select signals, enabling banked memory expansion. Use Value: 7.5 ns propagation delay ensures no added wait states; Ioff prevents contention during processor reset sequences. |
Use Scenario: Routing UART, SPI, I²C, and GPIO peripherals to a single microcontroller port group. IC Role / Device Role / Timing Role: Acts as peripheral enable distributor, asserting individual /CS lines based on control register bits. Use Value: Fully buffered inputs reduce loading on MCU GPIO; mixed-voltage tolerance allows direct connection to 5 V sensor buses. |
| Data Demultiplexing | Logic State Translation |
Use Scenario: Distributing a single serial data stream to four parallel output channels in test equipment. IC Role / Device Role / Timing Role: Uses active-low enable as data input, with A/B selecting destination channel (Y0–Y3). Use Value: Enables true 1:4 demux function without additional gates; low output impedance supports driving multiple loads. |
Use Scenario: Converting 2-bit binary commands from a 5 V FPGA into four discrete 3.3 V control signals for power management ICs. IC Role / Device Role / Timing Role: Performs voltage-level-aware decoding: accepts 5 V inputs while powered from 3.3 V VCC. Use Value: Eliminates need for discrete level shifters; guaranteed VIH/VIL thresholds ensure reliable recognition across VCC range. |
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 | Same silicon, SOIC-D package (wider 7.5 mm body vs NS's 5.3 mm); identical electrical specs and pinout | Requires PCB footprint change; better thermal dissipation (θJA = 73°C/W vs NS's 64°C/W) | Select if board layout accommodates D package and higher power density is needed. |
| SN74HC139N | Higher VCC max (6 V), slower tpd (24 ns @ 4.5 V), no Ioff or mixed-voltage support | Not suitable for partial-power-down or 2.5 V/3.3 V–5 V interfacing; limited to 4.5–6 V operation | Choose only for legacy 5 V-only systems where cost is primary and speed/power features are unnecessary. |
Compared with SN74LV139ADR, the SN74LV139ANS offers a smaller footprint and slightly lower thermal resistance, while SN74HC139N lacks Ioff and mixed-voltage capability-making it unsuitable for modern low-voltage or power-gated designs despite pin compatibility.
Availability
SN74LV139ANS is available at Aetrix Electronics and suitable for memory expansion, peripheral selection, data demultiplexing, and logic translation applications requiring stable component supply across industrial temperature ranges (−40°C to 85°C).
Supply support for SN74LV139ANS 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and communications reach.
The SN74LV139ANS belongs to TI's LV-A logic family, engineered for high-speed, low-voltage operation with robust power management features-targeting memory subsystems, FPGA/CPLD glue logic, and mixed-signal interface applications.
FAQ
What is the maximum propagation delay of the SN74LV139ANS at 3.3 V?
The SN74LV139ANS has a maximum propagation delay of 13 ns at VCC = 3.3 V with 15 pF load, as specified in the switching characteristics table. This value applies to transitions from address or enable inputs to any Y output, ensuring predictable timing in 3.3 V memory and logic systems.
Does the SN74LV139ANS support partial-power-down operation?
Yes, the SN74LV139ANS includes Ioff circuitry that disables outputs when VCC = 0 V, preventing backflow current from live bus lines into the unpowered device. This feature is explicitly documented in the datasheet and applies directly to the SN74LV139ANS in NS package.
Is the SN74LV139ANS pin-compatible with the SN74HC139N?
Yes, the SN74LV139ANS and SN74HC139N share identical 16-pin SO layouts and pin functions (1G, 1A, 1B, 1Y0–1Y3, VCC, GND, etc.), but they differ electrically: SN74LV139ANS supports 2–5.5 V operation, Ioff, and mixed-voltage inputs, whereas SN74HC139N operates only at 2–6 V with no Ioff or mixed-voltage capability.
What is the input voltage tolerance for SN74LV139ANS when VCC = 2.5 V?
When VCC = 2.5 V, the SN74LV139ANS accepts input voltages from 0 V to 5.5 V on all pins, per the "Input voltage range, VI" specification. This mixed-mode tolerance allows direct connection to 5 V controllers without level shifting, even when powered from 2.5 V.
What package type does SN74LV139ANS use, and what are its key mechanical dimensions?
The SN74LV139ANS uses the NS (SO) package: 16-pin small-outline with 1.27 mm lead pitch, 10.2 mm × 5.3 mm body size, and gull-wing leads. Its θJA is 64°C/W, and it complies with JEDEC MS-012 standards - confirmed in TI's packaging documentation for SN74LV139ANSRG4 ordering variant.
SN74LV139ANS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Circuit:
- -
- Independent Circuits:
- -
- Current - Output High, Low:
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- Voltage Supply Source:
- -
- Voltage - Supply:
- -
- Operating Temperature:
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- Grade:
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- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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SN74LV139ANS FAQ
1.How can I place an order for SN74LV139ANS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV139ANS 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 SN74LV139ANS reliable?
The price and inventory of SN74LV139ANS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV139ANS is usually 5 days.
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Once your SN74LV139ANS 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 SN74LV139ANS?
For technical support, including SN74LV139ANS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV139ANS requirements.
6.How does Aetrix verify that SN74LV139ANS is sourced from the original manufacturer or authorized distributors?
All SN74LV139ANS 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 SN74LV139ANS meets industry standards.
7.What is the process for return or replacement of SN74LV139ANS?
All SN74LV139ANS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV139ANS, 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 SN74LV139ANS part is unused and in its original packaging.
Return procedure for SN74LV139ANS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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