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Texas Instruments SN74HC139ADBR
- Part No.:
- SN74HC139ADBR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74HC139ADBR.pdf
- Description:
- DECODER/DEMUX DUAL 2-TO-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
SN74HC139ADBR from Texas Instruments is a dual 2-to-4 line decoder/demultiplexer with active-LOW outputs, CMOS-level inputs, and independent enable control per section. It operates from 2.0 V to 6.0 V, supports −40 °C to +125 °C, and delivers propagation delays as low as 11 ns at VCC = 6.0 V - used in memory address decoding and data routing within industrial microcontroller systems.
For engineers reviewing the SN74HC139ADBR datasheet, SN74HC139ADBR pinout, SN74HC139ADBR application, or SN74HC139ADBR equivalent, this page provides verified functional behavior, package-specific pin mapping (SSOP-16), real-world timing constraints, and validated alternatives for 2-to-4 decoding in space-constrained logic designs.
Technical Context
The SN74HC139ADBR integrates two independent 2-input binary decoders, each accepting address bits A0/A1 and an active-LOW enable (nE). Each decoder drives four mutually exclusive active-LOW outputs (nY0–nY3), enabling direct selection of one of four lines without bus contention.
Its CMOS input structure includes clamp diodes for overvoltage tolerance, permitting interface to signals exceeding VCC when current-limiting resistors are used. The device complies with JEDEC standard no. 7A and supports static and dynamic operation across full industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - enables compatibility with 3.3 V and 5 V logic domains without level shifters. |
| Propagation Delay (nA → nY) | 11 ns (typ) at VCC = 6.0 V - ensures tight timing margins in high-speed address decode paths. |
| Output Drive Capability | ±4 mA at VCC = 4.5 V - sufficient to drive multiple TTL or CMOS inputs directly. |
| Input Clamp Diodes | Integrated - allows safe interfacing to voltages > VCC using external current-limiting resistors. |
| Operating Temperature | −40 °C to +125 °C - qualified for under-hood and industrial control environments. |
| ESD Protection | HBM > 2000 V, MM > 200 V - meets robustness requirements for assembly and field operation. |
Pinout & Package
SN74HC139ADBR is housed in a 16-lead plastic shrink small outline package (SSOP-16), body width 5.3 mm, compliant with SOT338-1. This compact surface-mount package supports high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | 1E, 2E - Enable inputs | Active-LOW control per decoder; HIGH forces all four outputs HIGH (high-impedance equivalent). |
| 2, 3, 13, 14 | 1A0, 1A1, 2A0, 2A1 - Address inputs | Binary-select lines determining which of four outputs goes LOW; CMOS-compatible thresholds. |
| 4–7, 9–12 | 1Y0–1Y3, 2Y0–2Y3 - Outputs | Active-LOW decoded outputs; mutually exclusive assertion per decoder section. |
| 8 | GND | Ground reference (0 V) for logic and power return path. |
| 16 | VCC | Positive supply rail; must be decoupled locally to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables simultaneous 2-to-4 decoding for separate subsystems (e.g., I/O port + memory bank) on one IC. |
| Demultiplexing capability | Enable input serves as data line - converts 1-bit input into 4-channel active-LOW select signal. |
| CMOS-level input compatibility | VIH ≥ 1.5 V at VCC = 2.0 V; eliminates need for external level translation when interfacing with low-voltage MCUs. |
| JEDEC 7A compliance | Ensures interoperability with industry-standard logic families and test methodologies. |
| Wide temperature operation | Specified from −40 °C to +125 °C - suitable for automotive engine control modules and industrial PLCs. |
Applications
| Memory Address Decoding | Data Routing in MCU Peripherals |
|---|---|
Use Scenario: Selecting one of four SRAM or EEPROM chip-enable lines based on upper address bits. IC Role / Device Role / Timing Role: Dual decoder maps A1:A0 to CE# signals; enables banked memory expansion without FPGA or CPLD. Use Value: Reduces board area and BOM count versus discrete gate solutions; maintains <44 ns worst-case decode delay at 4.5 V. |
Use Scenario: Directing UART, SPI, or GPIO signals to one of four peripheral devices (e.g., sensors, DACs). IC Role / Device Role / Timing Role: Acts as a demultiplexer using nE as data input - routes serial stream to selected output channel. Use Value: Eliminates software-controlled GPIO toggling; guarantees deterministic, glitch-free channel selection in real-time systems. |
| Code Conversion | Industrial I/O Expansion |
Use Scenario: Converting 2-bit control codes (e.g., mode select) into four discrete enable signals for analog switches or relays. IC Role / Device Role / Timing Role: Decoder interprets binary code and asserts corresponding active-LOW output to activate hardware resources. Use Value: Provides hardware-based state resolution with zero CPU overhead and immunity to firmware crashes. |
Use Scenario: Expanding digital output capability of a microcontroller with limited GPIOs in programmable logic controllers. IC Role / Device Role / Timing Role: Drives up to eight loads (four per section) via open-drain compatible outputs with ±4 mA sink/source. Use Value: Supports direct connection to LED indicators, optocouplers, or small-signal MOSFET gates without buffer stages. |
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 |
|---|---|---|---|
| 74HC139D (SO-16) | Same logic function and electrical specs; differs only in SO16 package (3.9 mm body width vs. SSOP's 5.3 mm). | Preferred where board layout uses standard SOIC footprints or reflow profile favors wider pitch. | Select 74HC139D if existing design uses SOIC-16 land pattern or requires easier hand-soldering. |
| SN74HCT139DBR | TTL-compatible inputs (VIH = 2.0 V min); identical pinout and timing but higher input threshold. | Better suited for mixed 5 V TTL/CMOS systems where legacy logic drives the decoder. | Choose SN74HCT139DBR when interfacing with 74LS or other TTL-family outputs without level shifters. |
Compared with 74HC139D, SN74HC139ADBR offers 25 % smaller footprint and improved thermal resistance in SSOP; compared with SN74HCT139DBR, it lowers input threshold for reliable operation with 3.3 V microcontrollers - critical for modern low-voltage embedded designs.
Availability
SN74HC139ADBR is available at Aetrix Electronics and suitable for memory decoding, industrial I/O expansion, and microcontroller peripheral routing requiring stable component supply and long-term manufacturability.
Supply support for SN74HC139ADBR 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 company specializing in analog, embedded processing, and logic ICs, with leadership in industrial, automotive, and communications markets.
The SN74HC139ADBR belongs to TI's 74HC logic family - designed for low-power, high-noise-immunity CMOS applications operating across extended temperature ranges in space- and power-constrained systems.
FAQ
What is the maximum supply voltage rating for SN74HC139ADBR?
The absolute maximum supply voltage for SN74HC139ADBR is +7.0 V, but recommended operation is limited to 2.0 V to 6.0 V per datasheet Table 5. Operating continuously above 6.0 V risks parametric shift or permanent damage, even if within absolute max limits. Always use local decoupling and verify VCC stability during transient load conditions for SN74HC139ADBR.
Does SN74HC139ADBR support demultiplexing functionality?
Yes, SN74HC139ADBR supports demultiplexing: each decoder section uses its active-LOW enable (nE) as a data input, while A0/A1 act as select lines - converting one serial input into four time-multiplexed active-LOW outputs. This is confirmed in Section 1 (General description) and Figure 4 (Logic diagram) of the TI datasheet for SN74HC139ADBR.
What is the output drive strength of SN74HC139ADBR at 4.5 V?
At VCC = 4.5 V, SN74HC139ADBR delivers −4.0 mA (source) and +4.0 mA (sink) while maintaining VOL ≤ 0.26 V and VOH ≥ 3.98 V, per Table 6 (Static characteristics). This drive strength supports fan-out to ≥10 LS-TTL loads or direct interface to LEDs with series resistors, as specified in the SN74HC139ADBR datasheet.
Is SN74HC139ADBR pin-compatible with SN74HCT139DBR?
Yes, SN74HC139ADBR and SN74HCT139DBR share identical SSOP-16 pinout (SOT338-1), same terminal numbering, and matching functional assignment per pin - confirmed in Table 2 (Pin description) and Figure 5 (Pin configuration) of the NXP/TI documentation. They differ only in input threshold voltage, not physical layout.
What package type does SN74HC139ADBR use?
SN74HC139ADBR uses a 16-lead plastic shrink small outline package (SSOP-16), standardized as SOT338-1, with 0.65 mm lead pitch and 5.3 mm body width. This package is distinct from SO-16 (SOT109-1) and TSSOP-16 (SOT403-1), and its dimensions are fully documented in Figure 10 of the SN74HC139ADBR datasheet.
SN74HC139ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 2:4
- Independent Circuits:
- 2
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
SN74HC139ADBR FAQ
1.How can I place an order for SN74HC139ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC139ADBR 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 SN74HC139ADBR reliable?
The price and inventory of SN74HC139ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC139ADBR is usually 5 days.
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Once your SN74HC139ADBR 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 SN74HC139ADBR?
For technical support, including SN74HC139ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC139ADBR requirements.
6.How does Aetrix verify that SN74HC139ADBR is sourced from the original manufacturer or authorized distributors?
All SN74HC139ADBR 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 SN74HC139ADBR meets industry standards.
7.What is the process for return or replacement of SN74HC139ADBR?
All SN74HC139ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC139ADBR, 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 SN74HC139ADBR part is unused and in its original packaging.
Return procedure for SN74HC139ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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