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Texas Instruments SN74LS139ADRE4
- Part No.:
- SN74LS139ADRE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LS139ADRE4.pdf
- Description:
- IC DECODER/DEMUX 1X2:4 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,608
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Product details
Overview
SN74LS139ADRE4 from Texas Instruments is a dual 2-line-to-4-line decoder/demultiplexer in a 16-pin SOIC package, operating at 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 SN74LS139ADRE4 datasheet, SN74LS139ADRE4 pinout, SN74LS139ADRE4 application, or SN74LS139ADRE4 equivalent, this page delivers verified functional specifications, validated pin assignments, confirmed industrial temperature-range compatibility, and real-world substitution guidance for legacy TTL system design and obsolescence mitigation.
Technical Context
The SN74LS139ADRE4 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 operates strictly within the LS-TTL logic family: compatible with standard TTL input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), drives ±8 mA output current, and features open-collector-compatible outputs capable of wired-AND operation when externally pulled up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures interoperability with legacy 74LS/74S series without level-shifting. |
| Propagation Delay | 25 ns max (tpd) - enables reliable operation in 20-MHz address decode paths. |
| Supply Voltage | 4.75 V to 5.25 V - supports stable decoding under nominal 5-V rail with ±5% tolerance. |
| Output Drive | 8 mA sink per output - sufficient to drive multiple TTL inputs or small LED indicators directly. |
| Operating Temp | 0°C to 70°C - certified for commercial-grade embedded control and instrumentation applications. |
| Package | SOIC (D) – 16-pin, 1.27 mm pitch - industry-standard surface-mount footprint for automated assembly. |
| RoHS Compliance | Yes - lead-free NiPdAu finish, MSL Level-1 - suitable for modern reflow processes without moisture sensitivity concerns. |
Pinout & Package
SOIC-16 (Package Drawing D), 10.3 mm × 5.3 mm body, 1.75 mm max height, gull-wing leads, pin 1 marked by beveled corner or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15, 16 | G̅A, G̅B, VCC | Active-low enable for Decoder A / Decoder B / +5 V supply - both decoders disabled unless respective G̅ is low. |
| 2, 3, 4, 5 | AA, BA, Y0A, Y1A | Binary inputs A/B for Decoder A / active-low decoded outputs - Y0A–Y3A assert low only when G̅A = 0 and corresponding AB code matches. |
| 6, 7, 13, 14 | Y2A, Y3A, Y0B, Y1B | Remaining active-low outputs - full 4-output set per decoder, enabling independent 2:4 expansion. |
| 10, 11, 12 | AB, BB, Y2B | Inputs and outputs for Decoder B - identical timing and drive to Decoder A; Y3B is on pin 9. |
| 8, 9 | GND, Y3B | Ground reference / final active-low output - all outputs are open-collector, requiring external pull-up resistors for high-level assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables simultaneous decoding of two separate 2-bit address buses without interdependence or shared control. |
| Active-low enable & outputs | Supports direct interface with active-low chip select lines and simplifies wired-OR bus arbitration in memory-mapped systems. |
| LS-TTL compatible thresholds | Guarantees noise margin >400 mV with standard TTL outputs and eliminates need for input conditioning in mixed-logic designs. |
| Open-collector outputs | Permits flexible voltage translation via external pull-ups (e.g., 3.3 V or 5 V) and enables multi-drop bus sharing. |
| Commercial temperature range | Validated performance across 0°C–70°C ensures reliability in office equipment, test instruments, and non-automotive industrial controllers. |
Applications
| Memory Address Decoding | Peripheral Select Logic |
|---|---|
Use Scenario: Selecting one of four RAM/ROM chips in an 8-bit microcontroller system using upper address bits A1–A0. IC Role / Device Role / Timing Role: Dual decoder maps A1A0 to four chip-select lines (CS0–CS3), with G̅ driven by address enable signal. Use Value: Eliminates discrete gate logic, reduces board space, and maintains sub-30 ns decode latency critical for 1–2 MHz bus timing. | Use Scenario: Enabling UART, timer, or ADC peripherals in a Z80 or 8085-based single-board computer. IC Role / Device Role / Timing Role: SN74LS139ADRE4 provides four dedicated peripheral enables derived from I/O address lines and control strobes. Use Value: Ensures glitch-free peripheral activation with deterministic setup/hold margins due to matched internal path delays. |
| LED Segment Driver Control | Legacy Bus Arbitration |
Use Scenario: Driving common-anode 7-segment displays via ULN2003A where each digit requires unique segment enable. IC Role / Device Role / Timing Role: SN74LS139ADRE4 selects one of four digit positions by asserting individual digit-enable lines (active-low). Use Value: Provides precise, low-glitch digit multiplexing with TTL-compatible drive strength and no external inverters needed. | Use Scenario: Managing access priority among four DMA request sources in a vintage minicomputer backplane. IC Role / Device Role / Timing Role: SN74LS139ADRE4 decodes bus grant codes to assert dedicated channel-ready signals to each requester. Use Value: Delivers deterministic, race-free arbitration response with propagation delay variation <2 ns between outputs - critical for synchronous bus protocols. |
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 |
|---|---|---|---|
| SN74LS139ADR | Same die, identical electrical specs, RoHS-compliant NiPdAu finish, same SOIC-16 package, but shipped in tape-and-reel (2500 pcs) without E4 suffix marking. | No functional difference; E4 denotes TI's legacy RoHS-compliance marking convention - both meet same JEDEC standards. | Select SN74LS139ADR if sourcing volume reels without legacy marking requirements; otherwise SN74LS139ADRE4 is drop-in for existing BOMs referencing E4. |
| SN74HC139DR | CMOS version: wider VCC (2–6 V), lower ICC (<8 µA), faster tpd (17 ns typ), but TTL-input thresholds not guaranteed - requires 3.3 V or 5 V clean supply. | Not pin-compatible for direct TTL-system replacement: HC inputs lack TTL noise immunity; outputs cannot sink 8 mA without derating. | Choose SN74HC139DR only in new 3.3 V designs with controlled noise environment; avoid in legacy 5 V TTL systems unless level-shifting and load validation performed. |
Compared with SN74LS139ADR, SN74LS139ADRE4 offers identical functionality with legacy-compliant marking for traceability in aerospace or defense sustainment programs; versus SN74HC139DR, it guarantees robust TTL interfacing and full 8-mA drive but consumes more static power and lacks wide-voltage flexibility.
Availability
SN74LS139ADRE4 is available at Aetrix Electronics and suitable for memory decoding, peripheral selection, LED multiplexing, and legacy bus arbitration requiring stable component supply across long-lifecycle industrial and instrumentation programs.
Supply support for SN74LS139ADRE4 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, delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74LS139ADRE4 belongs to TI's legacy 74LS logic family, designed specifically for reliable, low-cost address decoding and signal routing in 5-V TTL systems deployed from the 1970s through early 2000s.
FAQ
What is the maximum clock frequency supported by SN74LS139ADRE4?
The SN74LS139ADRE4 is not a clocked device - it is a combinational decoder with no internal clock. Its usable switching rate depends on propagation delay (25 ns max) and system setup/hold timing. In practice, it reliably supports address decode operations up to ~20 MHz in well-terminated 5-V TTL buses, provided input transitions meet LS-TTL slew-rate requirements.
Does SN74LS139ADRE4 require external pull-up resistors on its outputs?
Yes, SN74LS139ADRE4 features open-collector outputs (Y0A–Y3B), so external pull-up resistors are mandatory to establish valid HIGH logic levels. Typical values range from 1.8 kΩ (for 8-mA sink at 5 V) to 10 kΩ (for low-power applications); resistor choice must balance speed, power, and fan-out requirements.
Can SN74LS139ADRE4 operate at 3.3 V supply voltage?
No - SN74LS139ADRE4 is specified only for 4.75 V to 5.25 V operation. At 3.3 V, input thresholds become unreliable (VIH minimum drops below spec), propagation delay increases significantly, and output drive falls below TTL-compatible levels. For 3.3 V systems, consider SN74HC139 or level-shifting solutions.
Is SN74LS139ADRE4 pin-compatible with SN74LS138?
No - SN74LS139ADRE4 is a dual 2-to-4 decoder in 16-pin SOIC, while SN74LS138 is a single 3-to-8 decoder in 16-pin package with different pinout, enable structure (three enables vs. two independent G̅), and truth table. They serve distinct decoding scales and are not interchangeable without PCB redesign.
What does the "E4" suffix in SN74LS139ADRE4 signify?
The "E4" suffix on SN74LS139ADRE4 indicates Texas Instruments' legacy RoHS-compliant marking designation, specifying NiPdAu lead finish and compliance with exemption 7a (lead in high-melting-temperature type solders). It carries identical electrical and thermal specs as SN74LS139ADR but retains this specific marking for traceability in regulated programs.
SN74LS139ADRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74LS139ADRE4 FAQ
1.How can I place an order for SN74LS139ADRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS139ADRE4 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 SN74LS139ADRE4 reliable?
The price and inventory of SN74LS139ADRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS139ADRE4 is usually 5 days.
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SN74LS139ADRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS139ADRE4 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 SN74LS139ADRE4?
For technical support, including SN74LS139ADRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS139ADRE4 requirements.
6.How does Aetrix verify that SN74LS139ADRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LS139ADRE4 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 SN74LS139ADRE4 meets industry standards.
7.What is the process for return or replacement of SN74LS139ADRE4?
All SN74LS139ADRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS139ADRE4, 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 SN74LS139ADRE4 part is unused and in its original packaging.
Return procedure for SN74LS139ADRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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