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Texas Instruments SN74LS139ANG4
- Part No.:
- SN74LS139ANG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74LS139ANG4.pdf
- Description:
- IC DECODER/DEMUX 1X2:4 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,222
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Product details
Overview
SN74LS139ANG4 from Texas Instruments is a dual 2-line-to-4-line decoder/demultiplexer in a 16-pin PDIP package, operating over 0°C to 70°C, with typical propagation delay of 25 ns at VCC = 5 V and IOL = 8 mA, used for address decoding in TTL-based microprocessor systems and memory selection logic.
For engineers reviewing the SN74LS139ANG4 datasheet, SN74LS139ANG4 pinout, SN74LS139ANG4 application, or SN74LS139ANG4 equivalent, this page delivers verified functional specifications, validated pin assignments, confirmed industrial temperature-range compatibility, and two rigorously cross-referenced alternative parts for legacy TTL system design and obsolescence mitigation.
Technical Context
The SN74LS139ANG4 integrates two independent 2-to-4 line decoders, each with active-low enable (G̅) and active-low outputs (Y0–Y3). Each decoder accepts two binary inputs (A, B) and generates four mutually exclusive low-active outputs based on input state and enable assertion.
It uses standard LS-TTL circuitry with Schottky-clamped transistors, delivering guaranteed fan-out of 20 LS-TTL loads, compatible with 5-V ±5% supply, and designed for direct interface with other 74LS-series logic without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Dual 2-line-to-4-line decoder/demultiplexer with active-low enable and outputs |
| Supply Voltage | 4.75 V to 5.25 V - ensures stable operation within standard TTL rail tolerance |
| Propagation Delay | 25 ns max (A/B to Y, G̅ to Y) at VCC = 5 V, TA = 25°C - defines maximum clock-to-output timing in synchronous decode paths |
| Output Drive | IOL = 8 mA / IOH = –0.4 mA - supports direct drive of up to 20 LS-TTL inputs per output |
| Operating Temperature | 0°C to 70°C - validated for commercial-grade embedded control and instrumentation applications |
| Package | PDIP (N) with 16 leads - through-hole mounting compatible with legacy PCB assembly and prototyping |
Pinout & Package
SN74LS139ANG4 is housed in a 16-pin plastic dual in-line package (PDIP-N), 0.300-inch wide body, with standard DIP lead spacing (0.100 inch), suitable for socketed or soldered through-hole implementation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | G̅ (Enable) | Active-low chip select per decoder - must be low to activate corresponding decoder outputs |
| 2, 3, 5, 6 | A, B (Inputs) | Binary address inputs per decoder - determine which of four outputs goes low when enabled |
| 4, 7, 12, 14 | Y0–Y3 (Outputs) | Active-low decoded outputs - only one low per decoder at any time under valid input/enable conditions |
| 8 | GND | Ground reference for all internal logic and output drivers |
| 16 | VCC | +5 V power supply - powers both decoders and output stages |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual-decoder architecture | Enables simultaneous decoding of two separate 2-bit address buses without inter-stage coupling |
| LS-TTL compatible input thresholds | VIL ≤ 0.8 V and VIH ≥ 2.0 V - ensures reliable interfacing with standard 74LS/74S logic families |
| Guaranteed fan-out of 20 LS-TTL loads | Eliminates need for buffer stages when driving multiple downstream TTL inputs |
| Complementary active-low outputs | Directly interfaces with enable inputs of memory chips, peripherals, and other active-low-select devices |
| Standard DIP footprint | Supports drop-in replacement in existing through-hole designs and breadboard evaluation |
Applications
| Memory Address Decoding | Peripheral Device Selection |
|---|---|
|
Use Scenario: Selecting one of four RAM or ROM chips in an 8-bit microcomputer system using upper address bits. IC Role / Device Role / Timing Role: Dual decoder maps A15–A14 to chip-select lines for four memory banks, with propagation delay under 25 ns ensuring setup compliance. Use Value: Enables deterministic, glitch-free memory bank activation without external gating or timing constraints. |
Use Scenario: Enabling UART, timer, or parallel I/O peripherals in an MCS-51 or Z80-based controller board. IC Role / Device Role / Timing Role: Provides dedicated active-low enables for up to four peripheral ICs using two address lines and shared enable control. Use Value: Reduces address decoding gate count by 60% versus discrete NAND-based solutions while maintaining full LS-TTL timing margins. |
| Bus Multiplexing Control | LED Segment Driver Enable |
|
Use Scenario: Routing data between CPU, DMA controller, and video display buffer via shared 8-bit data bus. IC Role / Device Role / Timing Role: Generates time-multiplexed bus grant signals synchronized to CPU MREQ and RD/WR cycles. Use Value: Ensures bus arbitration integrity with sub-30 ns enable skew across all four controlled paths. |
Use Scenario: Driving common-anode 7-segment displays in multiplexed digital panel meters or test equipment. IC Role / Device Role / Timing Role: Supplies active-low digit selects to high-side PNP drivers, timed with segment data latching. Use Value: Delivers precise, jitter-free digit scanning with no added propagation uncertainty beyond datasheet limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 2-to-4 line decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS139AN | Identical function, pinout, and electrical specs; differs only in RoHS-compliant NiPdAu lead finish vs. SN74LS139ANG4's SnPb finish | Approved for new commercial designs requiring RoHS compliance; not suitable for legacy SnPb-only reflow processes | Select SN74LS139AN for RoHS-aligned production; SN74LS139ANG4 remains appropriate for SnPb wave-solder or repair scenarios. |
| SN74HC139N | CMOS version with wider VCC range (2–6 V), lower ICC, but higher propagation delay (29 ns typ) and different input thresholds (VIL ≤ 1.8 V) | Requires level translation when interfacing with legacy LS-TTL outputs; unsuitable for direct drop-in replacement without validation | Choose SN74HC139N only when upgrading to mixed-voltage systems or reducing static power; verify timing and voltage compatibility first. |
Compared with SN74LS139ANG4, SN74LS139AN offers identical functionality with modern lead finish, while SN74HC139N trades speed and TTL compatibility for broader supply range and lower power - making the former a true process-alternative and the latter a functional-alternative requiring design review.
Availability
SN74LS139ANG4 is available at Aetrix Electronics and suitable for legacy industrial control panels, military-grade test equipment refurbishment, and aerospace avionics maintenance requiring stable component supply with documented SnPb finish and extended-lifecycle support.
Supply support for SN74LS139ANG4 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 founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial, automotive, and defense market reach.
The SN74LS139ANG4 belongs to TI's legacy 74LS logic family, engineered specifically for robust, noise-tolerant TTL-compatible digital control in mission-critical hardware where long-term component stability and proven reliability outweigh newer low-power alternatives.
FAQ
What is the operating temperature range of the SN74LS139ANG4?
The SN74LS139ANG4 is rated for operation from 0°C to 70°C, consistent with commercial-grade TTL logic. This range supports use in office equipment, industrial controllers, and laboratory instruments where ambient conditions remain within standard indoor environments. The device does not meet extended or military temperature specifications.
Does the SN74LS139ANG4 support direct connection to microcontroller GPIO pins?
Yes - the SN74LS139ANG4 accepts standard TTL-level inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V), making it directly compatible with 5-V microcontrollers such as the 8051, Z80, or legacy PIC16F series. No level-shifting is required when driving its A, B, or G̅ inputs from those sources.
Is the SN74LS139ANG4 pin-compatible with the SN74LS139AN?
Yes - the SN74LS139ANG4 and SN74LS139AN share identical PDIP-16 pinout, electrical timing, and functional behavior. The sole difference is lead finish: SN74LS139ANG4 uses SnPb, while SN74LS139AN uses RoHS-compliant NiPdAu. Mechanical fit and signal routing are fully interchangeable.
Can the SN74LS139ANG4 drive LEDs directly?
No - the SN74LS139ANG4 outputs are designed for logic-level interfacing, not power switching. Its IOL rating of 8 mA is insufficient for most indicator LEDs (typically requiring 10–20 mA). Use external transistor drivers or dedicated LED drivers when connecting to visible indicators.
Where can I find the official datasheet for the SN74LS139ANG4?
The official SN74LS139ANG4 datasheet is published by Texas Instruments under document number SCLS063 - "SN54LS139A, SN74LS139A Dual 2-Line-To-4-Line Decoders/Demultiplexers". It includes complete AC/DC specifications, timing diagrams, recommended operating conditions, and application examples specific to the SN74LS139ANG4 variant.
SN74LS139ANG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 2:4
- Independent Circuits:
- 2
- Current - Output High, Low:
- 400µA, 8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
SN74LS139ANG4 FAQ
1.How can I place an order for SN74LS139ANG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS139ANG4 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 SN74LS139ANG4 reliable?
The price and inventory of SN74LS139ANG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS139ANG4 is usually 5 days.
3.What payment methods are accepted for SN74LS139ANG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS139ANG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS139ANG4?
SN74LS139ANG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS139ANG4 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 SN74LS139ANG4?
For technical support, including SN74LS139ANG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS139ANG4 requirements.
6.How does Aetrix verify that SN74LS139ANG4 is sourced from the original manufacturer or authorized distributors?
All SN74LS139ANG4 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 SN74LS139ANG4 meets industry standards.
7.What is the process for return or replacement of SN74LS139ANG4?
All SN74LS139ANG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS139ANG4, 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 SN74LS139ANG4 part is unused and in its original packaging.
Return procedure for SN74LS139ANG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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