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Texas Instruments SN74LVC139AGQNR
- Part No.:
- SN74LVC139AGQNR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 20-VFBGA
- Datasheet:
-
SN74LVC139AGQNR.pdf
- Description:
- IC DECODER/DEMUX 1X2:4 20BGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LVC139AGQNR from Texas Instruments is a dual 2-line to 4-line decoder/demultiplexer in a 20-pin VFBGA (ZQN) package, operating from 1.65 V to 3.6 V, with max propagation delay of 6.2 ns at VCC = 3.3 V and inputs tolerant to 5.5 V - used for address decoding and data routing in low-voltage mixed-signal systems.
For engineers reviewing the SN74LVC139AGQNR datasheet, SN74LVC139AGQNR pinout, SN74LVC139AGQNR application, or SN74LVC139AGQNR equivalent, key selection criteria include its dual-decoder architecture, 5.5-V-tolerant inputs enabling 3.3-V/5-V level translation, VFBGA-20 footprint compatibility, and guaranteed latch-up immunity exceeding 250 mA per JESD 17.
Technical Context
This device integrates two independent 2-to-4 decoders sharing no internal logic coupling; each features active-low enable (G), two select inputs (A, B), and four active-low outputs (Y0–Y3). Inputs are fully buffered and present only one normalized CMOS load.
It supports mixed-voltage interfacing: 5-V TTL or CMOS drivers can directly drive inputs while outputs swing rail-to-rail between GND and VCC (1.65–3.6 V), making it suitable for voltage-level translation without external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables operation in modern low-power 1.8-V and 3.3-V systems, not compatible with 5-V-only supply rails. |
| Max tpd | 6.2 ns at VCC = 3.3 V - ensures sub-7-ns timing margin for high-speed address decode in microcontroller peripherals. |
| Input Voltage Tolerance | Up to 5.5 V - allows direct connection to legacy 5-V logic without level shifters, simplifying mixed-voltage board design. |
| Output Drive | ±24 mA at VCC = 3.0 V - sufficient to drive multiple LVC/LVT inputs or small capacitive loads (<30 pF) without buffering. |
| Latch-Up Immunity | >250 mA per JESD 17 - meets industrial robustness requirements and eliminates need for external current-limiting protection. |
| Power Dissipation Cap | 30.5 pF typical Cpd at 3.3 V - enables accurate dynamic power estimation in battery-powered or thermally constrained applications. |
Pinout & Package
SN74LVC139AGQNR uses a 20-ball VFBGA package (ZQN footprint, 2.5 mm × 3.0 mm, 0.5-mm pitch), optimized for space-constrained PCB layouts and automated assembly. Ball assignment follows JEDEC MO-220 standard for micro BGA devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | 1A (Decoder 1 Select A) | LSB address input for first decoder; referenced to VCC/GND; accepts 5.5-V signals safely. |
| A2 | 1B (Decoder 1 Select B) | MSB address input for first decoder; fully buffered, presents single CMOS load to driving source. |
| A3 | 1G (Decoder 1 Enable, active-low) | Active-low chip select; when high, all Y0–Y3 outputs forced high-impedance (disabled state). |
| B1 | 2A (Decoder 2 Select A) | LSB address input for second decoder; electrically identical to 1A, independent timing path. |
| B2 | 2B (Decoder 2 Select B) | MSB address input for second decoder; no crosstalk or shared propagation delay with Decoder 1. |
| B3 | 2G (Decoder 2 Enable, active-low) | Independent enable control for second decoder; supports asynchronous demux channel gating. |
| C1 | 1Y1 (Decoder 1 Output) | Active-low decoded output; sinks current when selected and enabled; VOL ≤ 0.55 V @ 24 mA. |
| C2 | 1Y0 (Decoder 1 Output) | Active-low LSB output of Decoder 1; matches timing and drive strength of all Yx outputs. |
| D1 | 2Y0 (Decoder 2 Output) | Active-low LSB output of Decoder 2; identical electrical specs to 1Y0, enabling interleaved routing. |
| D2 | 2Y1 (Decoder 2 Output) | Active-low output for Decoder 2; supports simultaneous dual-channel decode with matched skew. |
| E1 | GND | Ground reference for both decoders; dedicated ball minimizes ground bounce coupling between channels. |
| E2 | VCC | Single supply rail for entire device; decoupling required within 3 mm due to VFBGA inductance. |
| E3 | NC | No internal connection - must be left unconnected or tied to GND per TI layout guidelines; not usable as thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables parallel address decoding for two peripheral blocks (e.g., SPI flash + I²C EEPROM) without timing interaction. |
| 5.5-V-tolerant inputs | Eliminates external level translators when interfacing with 5-V microcontrollers or FPGAs in hybrid voltage systems. |
| Low dynamic power | Typical ICC = 10 µA at VCC = 3.6 V - reduces quiescent current in always-on subsystems like wake-up controllers. |
| High noise immunity | VIL = 0.35×VCC min, VIH = 0.65×VCC max - provides >0.5-V noise margin across full VCC range, critical for noisy industrial environments. |
| Robust ESD protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds IEC 61000-4-2 Level 3, reducing field failure risk during handling and operation. |
Applications
| Memory Address Decoding | Peripheral Selection Logic |
|---|---|
Use Scenario: Selecting one of four SRAM or Flash memory banks using 2-bit address lines from an MCU. IC Role / Device Role / Timing Role: Dual decoder maps A1:A0 to four independent /CS lines; each decoder handles two banks, enabling bank-swapping without software overhead. Use Value: 6.2-ns propagation delay ensures setup/hold compliance for 80-MHz bus clocks; 5.5-V-tolerant inputs accept MCU GPIOs directly. | Use Scenario: Routing UART, I²C, SPI, or GPIO signals to one of four sensor modules on a shared bus. IC Role / Device Role / Timing Role: Acts as demultiplexer: enable (G) driven by MCU GPIO, select lines (A/B) configure destination port; outputs drive /EN pins of sensor ICs. Use Value: Independent 1G/2G controls allow time-multiplexed access; ±24-mA drive ensures reliable activation of sensor enable inputs. |
| Level Translation Interface | Legacy System Integration |
Use Scenario: Interfacing a 3.3-V FPGA with 5-V industrial I/O modules requiring discrete address decoding. IC Role / Device Role / Timing Role: Translates 5-V address/control signals to 3.3-V-compatible levels while performing 2-to-4 decode; no external resistors needed. Use Value: Input tolerance eliminates level-shifter ICs; dual-decoder structure supports two independent 5-V subsystems from one 3.3-V domain. | Use Scenario: Upgrading aging 5-V control boards with modern low-power MCUs while retaining existing 5-V peripheral logic. IC Role / Device Role / Timing Role: Sits between new MCU and legacy decoder tree; accepts 5-V selects, outputs 3.3-V-compatible enables to downstream 74-series logic. Use Value: Latch-up immunity >250 mA protects against legacy bus faults; VFBGA-20 footprint fits dense retrofits without redesigning keepouts. |
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 |
|---|---|---|---|
| SN74LV139A | Wider VCC range (2.0–5.5 V); higher max tpd (10.5 ns at 5 V); no 5.5-V input tolerance - inputs limited to VCC. | Better suited for pure 5-V systems; unsuitable for 3.3-V/5-V translation due to input voltage limit. | Select when operating exclusively at 5 V and lower speed is acceptable; avoid if interfacing 5-V drivers to 3.3-V supplies. |
| 74LVC139PW | TSSOP-16 package (PW); identical electrical specs; larger footprint (5.0 × 4.4 mm vs. ZQN's 3.0 × 2.5 mm); same 1.65–3.6 V range and 5.5-V input tolerance. | Preferred for prototyping or manual assembly; incompatible with fine-pitch automated placement required for ZQN. | Choose for breadboarding or low-volume hand-soldered builds; SN74LVC139AGQNR remains optimal for high-density production PCBs. |
Compared with SN74LV139A and 74LVC139PW, SN74LVC139AGQNR uniquely combines VFBGA miniaturization, 5.5-V input tolerance, and sub-7-ns timing - making it the only option that satisfies space-constrained, mixed-voltage, high-speed decode requirements simultaneously.
Availability
SN74LVC139AGQNR is available at Aetrix Electronics and suitable for memory address decoding, peripheral selection logic, level translation interfaces, and legacy system integration requiring stable component supply and long-term manufacturability.
Supply support for SN74LVC139AGQNR 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions, with over 50 years of leadership in interface and translation ICs.
The SN74LVC139A product line delivers low-voltage, high-speed decoding and demultiplexing for mixed-signal systems - designed specifically to simplify voltage-domain bridging and reduce board-level component count in portable, industrial, and automotive electronics.
FAQ
What is the maximum operating temperature range for SN74LVC139AGQNR?
SN74LVC139AGQNR is rated for operation from –40°C to +85°C ambient temperature, matching the industrial temperature grade specified in the TI datasheet SCAS341O. This range is validated across all electrical parameters including propagation delay, output drive, and input thresholds. The ZQN package's thermal impedance (78°C/W) supports reliable operation within this range under typical PCB copper pour conditions.
Does SN74LVC139AGQNR support true bidirectional signal routing?
No, SN74LVC139AGQNR is a unidirectional decoder/demultiplexer with fixed input-to-output signal flow: select and enable inputs determine active-low output states. It does not support reverse signal paths or bus transceiver functionality. For bidirectional applications, separate direction-control logic or a dedicated transceiver IC such as SN74LVC245A would be required alongside SN74LVC139AGQNR.
Can SN74LVC139AGQNR be used without external pull-up or pull-down resistors on its inputs?
Yes - all inputs of SN74LVC139AGQNR have internal clamp diodes and defined VIH/VIL thresholds, but TI explicitly requires unused inputs to be held at VCC or GND to prevent floating nodes that cause increased ICC and potential oscillation. No external resistors are needed if driven actively; however, if left undriven, a 10-kΩ pull-up to VCC or pull-down to GND is recommended per TI application report SCBA004.
Is SN74LVC139AGQNR pin-compatible with other packages in the SN74LVC139A family?
No - SN74LVC139AGQNR uses a 20-ball ZQN VFBGA package, while other variants (e.g., D, PW, DB, RGY) use 16-pin packages with different pin counts, layouts, and ball/pad assignments. Although logic function and DC/AC specifications are identical, PCB layout, soldering process, and thermal management differ significantly. Migration requires full package redesign and revalidation.
What is the meaning of "NC" balls on the SN74LVC139AGQNR ZQN package?
"NC" (No Connection) balls on SN74LVC139AGQNR - such as ball C3 and D3 per the terminal assignment table - have no internal silicon connection and must remain unconnected in the PCB layout. TI documentation confirms these are not thermal pads or test points; connecting them to GND or VCC may cause undefined behavior or damage. They should be omitted from the footprint or tented in solder mask.
SN74LVC139AGQNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-VFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 20-BGA MICROSTAR JUNIOR (4x3)
SN74LVC139AGQNR FAQ
1.How can I place an order for SN74LVC139AGQNR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC139AGQNR 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 SN74LVC139AGQNR reliable?
The price and inventory of SN74LVC139AGQNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC139AGQNR is usually 5 days.
3.What payment methods are accepted for SN74LVC139AGQNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC139AGQNR transactions.
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4.How is shipping managed for SN74LVC139AGQNR?
SN74LVC139AGQNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC139AGQNR 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 SN74LVC139AGQNR?
For technical support, including SN74LVC139AGQNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC139AGQNR requirements.
6.How does Aetrix verify that SN74LVC139AGQNR is sourced from the original manufacturer or authorized distributors?
All SN74LVC139AGQNR 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 SN74LVC139AGQNR meets industry standards.
7.What is the process for return or replacement of SN74LVC139AGQNR?
All SN74LVC139AGQNR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC139AGQNR, 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 SN74LVC139AGQNR part is unused and in its original packaging.
Return procedure for SN74LVC139AGQNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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