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Texas Instruments SN74AHC139PWRG4
- Part No.:
- SN74AHC139PWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC139PWRG4.pdf
- Description:
- IC DECODER/DEMUX 1X2:4 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,418
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Product details
Overview
SN74AHC139PWRG4 from Texas Instruments is a dual 2-to-4 line decoder/demultiplexer IC designed for high-speed memory decoding and data-routing applications. It operates from 2 V to 5.5 V, delivers propagation delays as low as 5 ns at 5 V (CL = 15 pF), features active-low enable inputs per channel, and provides CMOS-compatible balanced push-pull outputs with ±8 mA drive capability at 5 V.
For engineers reviewing the SN74AHC139PWRG4 datasheet, SN74AHC139PWRG4 pinout, SN74AHC139PWRG4 application, or SN74AHC139PWRG4 equivalent, this page delivers verified functional identity, confirmed TSSOP-16 package mapping, validated 16-pin active-low dual-decoder operation, and real-world selection guidance for memory address decoding and bus-controlled peripheral selection.
Technical Context
The SN74AHC139PWRG4 implements two independent 2-input binary decoders, each with dedicated active-low enable (1G/2G) and two address inputs (1A0/1A1, 2A0/2A1). Outputs are active-low (Y0–Y3 per channel), high-impedance when disabled, and driven by balanced CMOS totem-pole stages.
It supports cascading via enable chaining and demultiplexing by using strobe as data input. Logic behavior follows positive-logic decoding: only one output per enabled channel goes low per unique A1A0 combination; all outputs remain high when enable is inactive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - Enables direct interface with 2.5 V, 3.3 V, and 5 V logic systems without level shifting. |
| tPLH / tPHL (5 V, CL = 15 pF) | 5 ns typical - Ensures minimal added delay in high-speed memory access paths where timing budgets are tight. |
| IOH / IOL (5 V) | ±8 mA - Sufficient to directly drive multiple standard CMOS inputs or small LED loads without external buffers. |
| VIH / VIL (5 V) | 3.85 V min / 1.65 V max - Provides robust noise margin (>0.8 V) against supply ripple and crosstalk in noisy digital environments. |
| ICC (5.5 V, TA = 25°C) | 4 µA typical - Enables ultra-low static power consumption in battery-backed or always-on decode circuits. |
| ESD HBM | ±2000 V - Meets industrial-grade ESD immunity requirements for board-level handling and system integration. |
| Cpd | 13 pF - Predictable dynamic power consumption enables accurate estimation of switching losses at known frequencies. |
Pinout & Package
TSSOP-16 package (PW), 5.00 mm × 6.4 mm body size, 0.65 mm lead pitch, surface-mount, moisture-sensitive level 1 (MSL-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1G | Channel 1 active-low output enable - Drives all four Y outputs high when asserted (low); disables decoding function. |
| 2 | 1A0 | Channel 1 least-significant address input - Determines LSB of 2-bit select code for Y0–Y3 activation. |
| 3 | 1A1 | Channel 1 most-significant address input - Determines MSB of 2-bit select code; combined with 1A0 selects one output. |
| 4–7 | 1Y0–1Y3 | Channel 1 active-low decoded outputs - Only one output goes low per valid A1A0 combination when 1G is active. |
| 8 | GND | Ground reference - Must be low-impedance connection; shared return path for all internal logic and output current sinks. |
| 9–12 | 2Y3–2Y0 | Channel 2 active-low decoded outputs - Mirror Channel 1 behavior; outputs numbered in reverse order per TI pinout convention. |
| 13 | 2A1 | Channel 2 most-significant address input - Independent of Channel 1; allows simultaneous but distinct decode operations. |
| 14 | 2A0 | Channel 2 least-significant address input - Paired with 2A1 to control Channel 2 output selection. |
| 15 | 2G | Channel 2 active-low output enable - Functionally identical to 1G; enables independent gating of second decoder. |
| 16 | VCC | Positive supply - Powers both decoder channels; requires local 0.1 µF bypass capacitor for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 2-to-4 decoders | Enables two separate address spaces or parallel peripheral selection without inter-channel timing coupling. |
| Active-low enable per channel (1G, 2G) | Simplifies hierarchical decoding: upstream enable signals can directly control channel activation without inverters. |
| Propagation delay ≤ 5 ns at 5 V | Meets sub-10 ns timing budgets in SRAM, Flash, and FPGA configuration memory interfaces. |
| CMOS-compatible I/O (2–5.5 V) | Eliminates need for voltage translators when interfacing with mixed-supply SoCs, microcontrollers, and FPGAs. |
| Latch-up immunity > 250 mA | Ensures robustness against transient overcurrent events in industrial control and automotive subsystems. |
Applications
| Memory Address Decoding | Peripheral Device Selection |
|---|---|
|
Use Scenario: Selecting one of four SRAM chips on a shared 8-bit data bus controlled by an 8-bit microcontroller. IC Role / Device Role / Timing Role: SN74AHC139PWRG4 acts as address-space partitioner, translating upper address bits into individual chip-select (CS) lines with sub-10 ns latency. Use Value: Reduces GPIO usage from four dedicated CS pins to two address lines + one enable, freeing MCU resources while maintaining full memory bandwidth. |
Use Scenario: Enabling one of four I²C sensor nodes on a common bus during polling cycles in an environmental monitoring system. IC Role / Device Role / Timing Role: SN74AHC139PWRG4 functions as bus multiplexer controller, asserting only one sensor's EN pin per cycle to avoid I²C address conflicts. Use Value: Allows reuse of identical sensor firmware across all nodes and eliminates need for software-addressable enable logic in each sensor. |
| Logic State Expansion | Demultiplexed Control Signal Routing |
|
Use Scenario: Expanding two FPGA GPIO pins into four independent reset signals for analog front-end ICs in a medical data acquisition module. IC Role / Device Role / Timing Role: SN74AHC139PWRG4 serves as synchronous reset distributor, generating glitch-free, edge-aligned reset pulses to four downstream devices. Use Value: Guarantees deterministic power-up sequencing without FPGA logic resource overhead or timing closure challenges. |
Use Scenario: Routing a single PWM signal from a motor controller to one of four gate drivers based on operational mode in an HVAC blower system. IC Role / Device Role / Timing Role: SN74AHC139PWRG4 operates as PWM demultiplexer, using address inputs to steer the PWM waveform to the selected driver's IN pin. Use Value: Enables dynamic reconfiguration of motor phases without hardware changes or additional MCU PWM peripherals. |
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 |
|---|---|---|---|
| 74LVC139AD,118 | Lower VCC range (1.65–3.6 V), 3.3 V optimized; 5.7 ns tPD at 3.3 V; ±24 mA IOL. | Better suited for 3.3 V-only systems with higher drive needs; not 5 V tolerant. | Select when operating exclusively at 3.3 V and requiring stronger sink current than SN74AHC139PWRG4 provides. |
| SN74HC139N | Same logic function and pinout; PDIP-16 package; slower speed (24 ns tPD at 6 V); higher ICC (8 µA typ). | Compatible for prototyping or through-hole designs; unsuitable for >20 MHz address bus timing. | Select for breadboard evaluation or legacy through-hole PCBs where thermal and speed constraints are relaxed. |
Compared with SN74AHC139PWRG4, the 74LVC139AD offers superior drive strength at 3.3 V but lacks 5 V operation, while SN74HC139N provides identical functionality in through-hole form with significantly higher propagation delay-making SN74AHC139PWRG4 optimal for space-constrained, high-speed surface-mount memory and bus systems.
Availability
SN74AHC139PWRG4 is available at Aetrix Electronics and suitable for high-speed memory decoding, peripheral selection, logic expansion, and demultiplexed control routing requiring stable component supply, consistent parametric performance, and long-term industrial availability.
Supply support for SN74AHC139PWRG4 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 specializing in analog, embedded processing, and logic solutions, with decades of experience in high-reliability industrial and automotive-grade components.
The SN74AHC139PWRG4 belongs to TI's AHC logic family, engineered for high-speed, low-power, and wide-voltage-operation applications in memory systems, programmable logic interfaces, and real-time control subsystems.
FAQ
What is the maximum clock frequency supported by SN74AHC139PWRG4?
The SN74AHC139PWRG4 is not a clocked device-it has no internal clock and operates asynchronously. Its usable frequency limit depends on input transition rate and load capacitance. With 15 pF load and 5 V supply, propagation delay is 5 ns typical, supporting address/data toggle rates up to ~100 MHz in well-designed systems with clean edges and proper termination.
Can SN74AHC139PWRG4 operate at 2.5 V supply voltage?
Yes, SN74AHC139PWRG4 is fully specified from 2 V to 5.5 V. At 2.5 V, it maintains guaranteed VIH (1.75 V min) and VIL (0.75 V max), with tPD increasing to ~11 ns (typical, CL = 15 pF). This makes SN74AHC139PWRG4 suitable for mixed-voltage systems interfacing with 2.5 V FPGAs or ASICs.
Does SN74AHC139PWRG4 support 5 V tolerant inputs when powered from 3.3 V?
No. SN74AHC139PWRG4 is not 5 V tolerant. Input voltage must not exceed VCC + 0.5 V per absolute maximum ratings. When powered from 3.3 V, inputs must stay within 0–3.8 V. For 5 V input compatibility, use a level-shifting buffer or select a 5 V tolerant logic family like LVT or ALVC.
How should unused inputs on SN74AHC139PWRG4 be handled?
All unused inputs on SN74AHC139PWRG4 must be terminated-never left floating. Tie unused address (A0/A1) or enable (G) inputs to VCC or GND using 10 kΩ resistors or direct connection. Floating CMOS inputs cause increased power consumption, oscillation, and potential device malfunction due to undefined threshold crossing.
Is SN74AHC139PWRG4 pin-compatible with SN74HC139?
Yes, SN74AHC139PWRG4 is pin-compatible with SN74HC139 in the same package (e.g., TSSOP-16), sharing identical pin functions and layout. However, SN74AHC139PWRG4 offers faster propagation delay (5 ns vs. 24 ns at 5 V), lower ICC, and wider VCC range (2–5.5 V vs. 2–6 V), making it a direct performance upgrade where timing and power matter.
SN74AHC139PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 2:4
- Independent Circuits:
- 2
- Current - Output High, Low:
- 8mA, 8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74AHC139PWRG4 FAQ
1.How can I place an order for SN74AHC139PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC139PWRG4 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 SN74AHC139PWRG4 reliable?
The price and inventory of SN74AHC139PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC139PWRG4 is usually 5 days.
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SN74AHC139PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC139PWRG4 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 SN74AHC139PWRG4?
For technical support, including SN74AHC139PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC139PWRG4 requirements.
6.How does Aetrix verify that SN74AHC139PWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHC139PWRG4 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 SN74AHC139PWRG4 meets industry standards.
7.What is the process for return or replacement of SN74AHC139PWRG4?
All SN74AHC139PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC139PWRG4, 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 SN74AHC139PWRG4 part is unused and in its original packaging.
Return procedure for SN74AHC139PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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