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Texas Instruments SN74LS139ANE4
- Part No.:
- SN74LS139ANE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74LS139ANE4.pdf
- Description:
- DUAL 2-LINE TO 4-LINE DECODERS /
- Quantity:
- Payment:
- Shipping:
Inventory:3,605
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Product details
Overview
SN74LS139ANE4 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 TTL-compatible inputs and outputs, 15 mA output drive capability, and propagation delay of 25 ns typical at VCC = 5 V. It enables address decoding in microprocessor-based systems and memory selection in embedded controllers.
For engineers reviewing the SN74LS139ANE4 datasheet, SN74LS139ANE4 pinout, SN74LS139ANE4 application, or SN74LS139ANE4 equivalent, this page delivers verified functional identity, confirmed pin mapping, validated timing parameters, real-world use cases, and two technically documented alternative parts for industrial control and legacy logic design.
Technical Context
The SN74LS139ANE4 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 bipolar TTL technology with Schottky-clamped transistors, ensuring compatibility with standard LS-TTL families. Input thresholds are VIL = 0.8 V max and VIH = 2.0 V min; output voltage levels meet VOL = 0.5 V max at IOL = 8 mA and VOH = 2.7 V min at IOH = –0.4 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures interoperability with 74LS-series components and predictable noise margins in mixed-logic systems. |
| Propagation Delay | 25 ns typical - supports reliable operation up to ~20 MHz clock rates in synchronous decode paths. |
| Output Drive | 15 mA sink per output - sufficient to directly drive multiple LS-TTL inputs or small LEDs without external buffers. |
| Supply Voltage | 4.75 V to 5.25 V - tight tolerance required for stable TTL switching thresholds and fanout integrity. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade applications including industrial HMIs and instrumentation front-ends. |
| Input Compatibility | TTL-level - accepts standard LS, S, and ALS logic outputs without level-shifting circuitry. |
Pinout & Package
SN74LS139ANE4 is housed in a 16-pin plastic dual in-line package (PDIP-N), 0.300-inch wide body, with 0.100-inch lead pitch and through-hole mounting. Pin 1 is marked by a notch or dot at the left end of the top edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | G̅₁ (Enable 1) | Active-low enable for first decoder; when high, all Y₀–Y₃ outputs remain high regardless of A₁/B₁. |
| 2 | A₁ | MSB input for first decoder; combined with B₁ determines which of Y₀–Y₃ goes low when G̅₁ is asserted. |
| 3 | B₁ | LSB input for first decoder; forms 2-bit address with A₁ to select one of four decoded outputs. |
| 4–7 | Y₀₁–Y₃₁ | Active-low outputs of first decoder; only one is low at a time when G̅₁ is low and A₁/B₁ are valid. |
| 8 | GND | Power ground reference for both decoders and internal bias networks. |
| 9–12 | Y₀₂–Y₃₂ | Active-low outputs of second decoder; functionally identical to Y₀₁–Y₃₁ but driven by A₂/B₂/G̅₂. |
| 13 | B₂ | LSB input for second decoder; independent of first decoder's inputs for parallel address decoding. |
| 14 | A₂ | MSB input for second decoder; allows simultaneous decoding of two separate 2-bit addresses. |
| 15 | G̅₂ | Active-low enable for second decoder; isolated control enables selective activation of either decoder block. |
| 16 | VCC | +5 V supply rail; powers both decoder sections and defines logic threshold references. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables concurrent decoding of two 2-bit addresses-e.g., memory bank + peripheral select-without external gating. |
| Active-low outputs and enables | Simplifies interface with common cathode LED displays and open-collector bus drivers requiring low-active signaling. |
| Standard LS-TTL compatibility | Guarantees direct interconnection with 74LS00, 74LS04, 74LS373, and other LS-family devices without interface logic. |
| High noise immunity | Input hysteresis and defined VIL/VIH thresholds reject transient coupling in noisy industrial PCB environments. |
| Through-hole PDIP packaging | Supports prototyping, repairability, and long-term availability in legacy industrial control systems where surface-mount is impractical. |
Applications
| Memory Address Decoding | Peripheral Selection Logic |
|---|---|
|
Use Scenario: Selecting one of four RAM/ROM chips in an 8-bit microcontroller system using upper address bits A1–A2. IC Role / Device Role / Timing Role: Dual decoder maps A1/A2 to chip-select lines CS0–CS3, enabling single-cycle memory access without wait states. Use Value: Eliminates need for discrete NAND gates or PLD programming, reducing BOM count and layout complexity in cost-sensitive designs. |
Use Scenario: Routing data between CPU and four UARTs, ADCs, or DACs based on I/O port address. IC Role / Device Role / Timing Role: Provides synchronized, glitch-free peripheral enable signals synchronized to address latch timing. Use Value: Ensures deterministic peripheral activation timing with <25 ns decode latency, critical for real-time serial communication handshaking. |
| LED Segment Driver Interface | Legacy Bus Expansion Control |
|
Use Scenario: Driving common-cathode 7-segment display digits via multiplexed anode control. IC Role / Device Role / Timing Role: Generates digit-select signals (D0–D3) that gate segment data to individual display positions. Use Value: Leverages active-low outputs to directly sink current from segment drivers, avoiding external inverters or PNP transistors. |
Use Scenario: Expanding ISA or PC/104 bus slots by decoding expansion address space into slot-enable signals. IC Role / Device Role / Timing Role: Acts as address-space partitioner, asserting EN lines for up to four add-in cards simultaneously. Use Value: Maintains strict timing alignment with bus control signals (IOR, IOW), preventing bus contention during slot arbitration. |
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 electrical specs and pinout; differs only in RoHS-compliant NiPdAu lead finish vs. SN74LS139ANE4's NIPDAU finish. | No functional difference; both rated for 0°C to 70°C and PDIP-16 packaging. | Select SN74LS139AN if RoHS compliance is mandatory and legacy NIPDAU finish is not required. |
| SN74HC139N | CMOS family (74HC), wider VCC range (2–6 V), lower ICC, higher noise immunity, but slower propagation (24–34 ns typ), and non-TTL input thresholds. | Requires level-shifting or redesign if interfacing with legacy TTL buses; unsuitable for direct replacement in LS-only systems. | Choose SN74HC139N only when upgrading to CMOS power efficiency and supply flexibility, with full signal integrity validation. |
Compared with SN74LS139ANE4, SN74LS139AN offers identical functionality with updated finish compliance, while SN74HC139N trades TTL compatibility for broader voltage operation and lower static power-making it suitable only after verifying input threshold compatibility and timing margins in the target system.
Availability
SN74LS139ANE4 is available at Aetrix Electronics and suitable for industrial control panels, legacy test equipment, and embedded instrumentation requiring stable component supply, long-lifecycle support, and through-hole assembly compatibility.
Supply support for SN74LS139ANE4 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 aerospace qualification.
The SN74LS139ANE4 belongs to TI's legacy 74LS logic family, designed specifically for robust, pin-compatible replacements in aging TTL-based systems where reliability and backward compatibility outweigh power or speed optimization.
FAQ
What is the primary function of the SN74LS139ANE4?
The SN74LS139ANE4 is a dual 2-line-to-4-line decoder/demultiplexer that converts two binary inputs into one of four active-low outputs per section, controlled by independent active-low enables. Its core function is address decoding and signal routing in TTL-based digital systems, and the SN74LS139ANE4 maintains strict LS-TTL electrical compatibility for seamless integration into legacy designs.
Does the SN74LS139ANE4 support 3.3 V operation?
No, the SN74LS139ANE4 is specified only for 4.75 V to 5.25 V operation and does not guarantee correct logic thresholds or output drive at 3.3 V. Attempting 3.3 V supply may result in undefined outputs or excessive input current; for 3.3 V systems, consider SN74LVC139A instead. The SN74LS139ANE4 requires a stable 5 V rail to meet its published timing and voltage specifications.
Can the SN74LS139ANE4 replace the SN74LS139AN in a PCB design?
Yes-the SN74LS139ANE4 is a direct drop-in replacement for SN74LS139AN, sharing identical PDIP-16 packaging, pinout, electrical specifications, and temperature rating (0°C to 70°C). The only distinction is the lead finish: SN74LS139ANE4 uses NIPDAU, while SN74LS139AN uses NiPdAu. Both are RoHS-compliant and require no PCB changes. The SN74LS139ANE4 retains full functional equivalence with the SN74LS139AN across all operating conditions.
What is the maximum fanout of the SN74LS139ANE4?
The SN74LS139ANE4 provides a standard LS-TTL fanout of 20 for inputs driving other LS devices, based on its IOH = –0.4 mA and IOL = 8 mA ratings. When driving multiple loads, total capacitive load should remain ≤ 15 pF per output to maintain 25 ns propagation delay. The SN74LS139ANE4's output drive strength is optimized for direct connection to LS, S, and ALS families without buffering.
Is the SN74LS139ANE4 suitable for new designs?
The SN74LS139ANE4 remains actively produced and supported by Texas Instruments for legacy system maintenance, repair, and industrial upgrades where TTL compatibility and through-hole assembly are required. While newer CMOS alternatives offer lower power, the SN74LS139ANE4 is appropriate for new designs targeting long-term availability, mechanical serviceability, or integration into existing LS-TTL infrastructure. TI continues to ship the SN74LS139ANE4 with full datasheet and application support.
SN74LS139ANE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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
SN74LS139ANE4 FAQ
1.How can I place an order for SN74LS139ANE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS139ANE4 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 SN74LS139ANE4 reliable?
The price and inventory of SN74LS139ANE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS139ANE4 is usually 5 days.
3.What payment methods are accepted for SN74LS139ANE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS139ANE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS139ANE4?
SN74LS139ANE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS139ANE4 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 SN74LS139ANE4?
For technical support, including SN74LS139ANE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS139ANE4 requirements.
6.How does Aetrix verify that SN74LS139ANE4 is sourced from the original manufacturer or authorized distributors?
All SN74LS139ANE4 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 SN74LS139ANE4 meets industry standards.
7.What is the process for return or replacement of SN74LS139ANE4?
All SN74LS139ANE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS139ANE4, 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 SN74LS139ANE4 part is unused and in its original packaging.
Return procedure for SN74LS139ANE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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