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Texas Instruments SN74HC139ADB
- Part No.:
- SN74HC139ADB
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74HC139ADB.pdf
- Description:
- DECODER/DEMUX DUAL 2-TO-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,360
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Product details
Overview
SN74HC139ADB from NXP Semiconductors is a dual 2-to-4 line decoder/demultiplexer in SSOP16 package, operating from −40 °C to +125 °C with CMOS-level inputs, active-LOW mutually exclusive outputs, and enable-controlled demultiplexing. It supports memory decoding and data routing in industrial control logic and address selection circuits.
For engineers reviewing the SN74HC139ADB datasheet, SN74HC139ADB pinout, SN74HC139ADB application, or SN74HC139ADB equivalent, key selection criteria include its dual independent decoder architecture, TTL-compatible input thresholds (via HCT variant), propagation delay down to 12 ns at 4.5 V, ESD robustness (>2000 V HBM), and support for 1-to-4 demultiplexing via the active-LOW enable input.
Technical Context
The SN74HC139ADB integrates two fully independent 2-input binary decoders, each with dedicated address inputs (A0, A1), active-LOW enable (nE), and four active-LOW outputs (nY0–nY3). Outputs are mutually exclusive: only one output per decoder is LOW for any valid input combination when enabled.
Its enable input functions as a data path selector in demultiplexer mode, while internal clamp diodes allow interface to voltages exceeding VCC using current-limiting resistors. The device complies with JEDEC standard no. 7A and supports operation across extended temperature ranges without derating up to +125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2.0 V to 6.0 V - supports mixed-voltage system interfacing and battery-powered logic |
| Propagation delay (nA→nY) | 12 ns typical at VCC = 4.5 V - enables high-speed address decoding in microcontroller peripheral selection |
| Output drive | ±4.0 mA at VCC = 4.5 V - sufficient to directly drive LED indicators or TTL inputs without buffering |
| Input threshold (VIH/VIL) | 3.15 V/1.35 V at VCC = 4.5 V - CMOS-compatible switching levels ensure noise margin >1.3 V |
| ESD protection | HBM >2000 V - meets IEC 61000-4-2 Level 3 for robust handling in automated assembly |
| Operating temperature | −40 °C to +125 °C - qualified for under-hood automotive modules and industrial motor drives |
| Power dissipation capacitance | 42 pF - enables accurate dynamic power estimation in clocked bus applications |
Pinout & Package
SN74HC139ADB uses the SSOP16 (SOT338-1) package: plastic shrink small outline, 16 leads, body width 5.3 mm, 0.65 mm lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | 1E, 2E | Active-LOW enable inputs - assert LOW to activate respective decoder; HIGH forces all outputs HIGH |
| 2, 3 | 1A0, 1A1 | Binary address inputs for Decoder 1 - select one of four active-LOW outputs (1Y0–1Y3) |
| 4–7 | 1Y0–1Y3 | Decoder 1 outputs - mutually exclusive active-LOW signals; used for chip select or signal routing |
| 8 | GND | Ground reference - must be low-impedance connection to minimize ground bounce in multi-output switching |
| 9–12 | 2Y0–2Y3 | Decoder 2 outputs - electrically isolated from Decoder 1; enables parallel address decoding paths |
| 13, 14 | 2A0, 2A1 | Binary address inputs for Decoder 2 - identical timing and loading behavior as Decoder 1 inputs |
| 16 | VCC | Positive supply - decoupling capacitor (100 nF) required within 5 mm for stable high-speed operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Two separate 2-to-4 decode paths on one die - eliminates inter-decoder timing skew and reduces PCB footprint vs discrete solutions |
| Demultiplexing capability | Enable input doubles as data input - allows 1-to-4 signal distribution without external gating logic |
| Clamp diode protection | Integrated input diodes - permit safe interface to 5 V or 12 V control signals using series current-limiting resistors |
| Wide temperature range | −40 °C to +125 °C operation - validated for use in engine control units and industrial PLC backplanes |
| JEDEC 7A compliance | Standardized pinout and AC/DC characteristics - ensures interoperability with legacy 74-series logic designs |
Applications
| Memory Address Decoding | Data Routing in Industrial PLCs |
|---|---|
|
Use Scenario: Selecting one of four SRAM or EEPROM chips in a microcontroller-based data logger. IC Role / Device Role / Timing Role: Dual decoder maps 2-bit address bus to individual chip-select lines; enables concurrent access to multiple memory banks. Use Value: Reduces address decoding latency to ≤12 ns and eliminates need for discrete AND gates or additional logic ICs. |
Use Scenario: Distributing sensor data streams from a central controller to four analog input modules in an industrial automation rack. IC Role / Device Role / Timing Role: Acts as a 1-to-4 demultiplexer using nE as data input and A0/A1 as channel select - routes single serial stream to parallel destinations. Use Value: Enables deterministic time-division multiplexing with sub-15 ns channel switching and no external latch requirements. |
| Code Conversion in Motor Drives | Peripheral Selection in Embedded Systems |
|
Use Scenario: Converting 2-bit PWM phase commands into four discrete gate-drive enable signals for an H-bridge inverter stage. IC Role / Device Role / Timing Role: Decoder outputs directly drive optocoupler inputs; active-LOW outputs match common-cathode driver topology. Use Value: Guarantees mutually exclusive output states - prevents shoot-through by ensuring only one gate driver is active at any time. |
Use Scenario: Selecting between UART, SPI, I²C, and GPIO peripherals connected to a Cortex-M0+ MCU's shared address/data bus. IC Role / Device Role / Timing Role: Provides chip-select signals for peripheral ICs; dual decoder allows simultaneous management of two peripheral groups. Use Value: Supports hot-plug detection via enable pin monitoring and maintains <100 µA quiescent current during standby. |
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 |
|---|---|---|---|
| SN74HCT139DB | TTL-compatible input thresholds (VIH = 2.0 V min); otherwise identical pinout, timing, and DC specs | Better interoperability with legacy 5 V TTL systems; higher input current during transitions | Select when interfacing with 74LS or older microcontrollers lacking CMOS-level output swing |
| 74AC139PC | Faster propagation delay (≤8 ns at 5 V); higher ICC (max 40 µA); PDIP package only | Higher speed suitable for 25 MHz bus arbitration; incompatible pinout and thermal profile | Choose only if SSOP16 footprint is not required and sub-10 ns timing is critical for system-level setup/hold margins |
Compared with SN74HC139ADB, SN74HCT139DB offers seamless integration into mixed-logic systems but increases dynamic power slightly, while 74AC139PC delivers superior speed at the cost of package flexibility and higher supply current - making SN74HC139ADB optimal for space-constrained, thermally sensitive industrial designs requiring balanced performance and compatibility.
Availability
SN74HC139ADB is available at Aetrix Electronics and suitable for industrial control logic, embedded peripheral selection, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HC139ADB 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The SN74HC139ADB belongs to NXP's 74HC logic family, designed for high-noise-immunity, low-power digital interfacing in resource-constrained embedded systems where reliability across wide temperature ranges is essential.
FAQ
What is the maximum supply voltage rating for SN74HC139ADB?
The absolute maximum supply voltage for SN74HC139ADB is +7.0 V, but recommended operation is limited to 2.0 V to 6.0 V per the datasheet. Exceeding 6.0 V risks violating static characteristics and may degrade long-term reliability, especially at elevated temperatures. SN74HC139ADB must never be operated continuously above 6.0 V in production designs.
Does SN74HC139ADB support demultiplexing functionality?
Yes, SN74HC139ADB supports 1-to-4 demultiplexing by using the active-LOW enable input (nE) as the data input and the address inputs (A0, A1) as the channel select lines. When nE is LOW, the selected output goes LOW; when nE is HIGH, all outputs remain HIGH - enabling direct signal distribution without additional logic gates.
What is the propagation delay of SN74HC139ADB at 5.0 V supply?
At VCC = 5.0 V and CL = 15 pF, the typical propagation delay of SN74HC139ADB is 11 ns for address-to-output (nAn → nYn) and 10 ns for enable-to-output (nE → nYn). These values are measured under standard test conditions and represent the dominant timing path for address decoding and demux control in real-world implementations of SN74HC139ADB.
Can SN74HC139ADB operate reliably at 125 °C ambient temperature?
Yes, SN74HC139ADB is fully specified and tested for continuous operation from −40 °C to +125 °C ambient temperature. Its DC and AC parameters - including VIH/VIL thresholds, VOL/VOH levels, and propagation delay - are guaranteed across this full range, making SN74HC139ADB suitable for under-hood automotive modules and high-temperature industrial environments.
How does the clamp diode feature benefit SN74HC139ADB system design?
The integrated input clamp diodes in SN74HC139ADB allow safe interfacing to voltage sources exceeding VCC (e.g., 12 V sensors or 5 V microcontrollers) when used with external current-limiting resistors. This eliminates the need for discrete protection diodes or level-shifters, simplifying board layout and reducing BOM count while maintaining signal integrity in mixed-voltage systems using SN74HC139ADB.
SN74HC139ADB 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
SN74HC139ADB FAQ
1.How can I place an order for SN74HC139ADB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC139ADB 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 SN74HC139ADB reliable?
The price and inventory of SN74HC139ADB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC139ADB is usually 5 days.
3.What payment methods are accepted for SN74HC139ADB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC139ADB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC139ADB?
SN74HC139ADB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC139ADB 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 SN74HC139ADB?
For technical support, including SN74HC139ADB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC139ADB requirements.
6.How does Aetrix verify that SN74HC139ADB is sourced from the original manufacturer or authorized distributors?
All SN74HC139ADB 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 SN74HC139ADB meets industry standards.
7.What is the process for return or replacement of SN74HC139ADB?
All SN74HC139ADB units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC139ADB, 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 SN74HC139ADB part is unused and in its original packaging.
Return procedure for SN74HC139ADB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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