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Texas Instruments SN74AHCT139PWR
- Part No.:
- SN74AHCT139PWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT139PWR.pdf
- Description:
- IC DECODER/DEMUX 1X2:4 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,896
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Product details
Overview
SN74AHCT139PWR from Texas Instruments is a dual 2-line-to-4-line decoder/demultiplexer in TSSOP-16 package, operating at 4.5–5.5 V, with propagation delays as low as 1 ns (tPLH/tPHL at 15 pF), TTL-compatible inputs, and ±8 mA output drive-designed for high-speed memory decoding and data-routing applications in industrial control and embedded systems.
For engineers reviewing the SN74AHCT139PWR datasheet, SN74AHCT139PWR pinout, SN74AHCT139PWR application, or SN74AHCT139PWR equivalent, key selection criteria include its dual-decoder architecture with independent active-low enables, 5.5-V absolute maximum supply rating, latch-up immunity >250 mA, and compatibility with fast-enable memory subsystems where system delay must remain negligible relative to memory access time.
Technical Context
The SN74AHCT139PWR integrates two independent 2-to-4 decoders, each with separate active-low enable (1G/2G) and dual address inputs (A/B), supporting cascading via enable chaining and demultiplexing by routing the enable input as a data line. Its fully buffered TTL-compatible inputs present only one normalized load per input.
Each decoder drives four active-low outputs (Y0–Y3) with totem-pole structure, delivering VOH ≥ 3.8 V at IOH = –8 mA and VOL ≤ 0.44 V at IOL = 8 mA under VCC = 4.5 V, while maintaining ESD protection exceeding 2000-V HBM and 200-V MM per JESD22.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation across standard 5-V logic rails with margin for ripple and drop. |
| Propagation Delay (tPLH/tPHL) | 1 ns (min) / 8.5 ns (max) at CL = 15 pF - enables sub-10 ns decoding critical for high-speed memory address selection. |
| Output Drive | ±8 mA - sufficient to directly drive multiple CMOS/TTL loads without external buffering in bus interface applications. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - allows seamless interfacing with legacy 5-V TTL logic families. |
| Latch-Up Immunity | >250 mA per JESD17 - guarantees robustness against transient current faults in noisy industrial environments. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets stringent reliability requirements for automated PCB assembly and field operation. |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial temperature range deployment. |
Pinout & Package
TSSOP-16 (PW) package: 4.4 mm × 5.0 mm body, 1.2 mm max height, 0.65 mm lead pitch, exposed pad not present, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-low enable inputs | Enable/disable respective decoder independently; can serve as data input in demux mode. |
| 1A, 1B / 2A, 2B | Address select inputs | Binary-select lines determining which of four outputs (Y0–Y3) goes low per decoder. |
| 1Y0–1Y3 / 2Y0–2Y3 | Active-low decoded outputs | Four mutually exclusive low-active outputs per decoder; no bus contention when used singly. |
| VCC (Pin 16) | Positive supply | 5-V nominal rail; supports up to 7-V absolute max for transient tolerance. |
| GND (Pin 8) | Ground reference | Common return for all logic and output currents; requires low-impedance PCB connection. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables compact implementation of two parallel 2-to-4 decode paths without inter-stage delay or shared control overhead. |
| Active-low enable with data capability | Permits use of G inputs as demultiplexer data lines-eliminates need for external gating in 1-to-4 signal distribution. |
| High-speed propagation | Typical 7.2 ns delay at 15 pF allows integration into sub-100 MHz address decode timing budgets. |
| Full input/output buffering | Each input presents only one normalized load-reduces fanout constraints and stabilizes driving gate timing. |
| Robust process reliability | Latch-up immunity >250 mA and full JESD22 ESD ratings ensure long-term operation in electrically harsh environments. |
Applications
| Memory Address Decoding | Peripheral Select Logic |
|---|---|
|
Use Scenario: Selecting one of four SRAM or Flash memory banks in a microcontroller-based industrial PLC. IC Role / Device Role / Timing Role: Dual decoder routes A1–A2 address bits to activate individual chip-select lines (CS0–CS3), synchronized with memory enable timing. Use Value: Propagation delay <8.5 ns ensures CS assertion occurs well before memory access window closes, eliminating wait states. |
Use Scenario: Enabling one of four UART, SPI, or GPIO expansion ICs on a modular I/O carrier board. IC Role / Device Role / Timing Role: Acts as peripheral selector-address inputs driven by MCU GPIO, enables routed to dedicated peripheral EN pins. Use Value: Independent 1G/2G controls allow staggered activation or power-gating of peripherals without software overhead. |
| Bus Signal Demultiplexing | Test Mode Selection |
|
Use Scenario: Routing a single diagnostic data line from a BIST controller to four test points on a multi-function ASIC. IC Role / Device Role / Timing Role: Configured as 1-to-4 demux using 1G as data input and 1A/1B as select lines. Use Value: Active-low outputs interface directly with test point pull-up networks-no level-shifting or inversion logic required. |
Use Scenario: Generating four discrete test-mode enable signals (e.g., analog calibration, digital loopback, thermal stress, boundary scan) from two configuration pins. IC Role / Device Role / Timing Role: Decoder outputs drive enable inputs of dedicated test circuitry; G inputs tied to mode-control register bits. Use Value: Eliminates need for discrete NAND gates or CPLD resources-reduces BOM count and layout area in test infrastructure. |
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 |
|---|---|---|---|
| SN74HCT139PWR | Same pinout and function but HCT family: wider VCC range (2–6 V), higher input thresholds (VIH = 3.5 V), slower typical delay (~15 ns). | Better suited for mixed-voltage systems (e.g., 3.3-V control + 5-V peripherals); less ideal for tight-timing 5-V memory decode. | Select SN74HCT139PWR only if operating below 4.5 V or requiring higher noise immunity at VIH. |
| 74LCX139MTCX | Lower VCC range (2–3.6 V), 3.3-V optimized, 5-V tolerant inputs, faster max delay (6.5 ns), smaller TSSOP-16 footprint (4.4 × 3.5 mm). | Designed for modern low-voltage embedded systems; not suitable for pure 5-V designs due to 3.6-V VCC max. | Choose 74LCX139MTCX only in 3.3-V domains with 5-V tolerant I/O requirements and space-constrained layouts. |
Compared with SN74HCT139PWR and 74LCX139MTCX, the SN74AHCT139PWR uniquely balances 5-V speed (sub-10 ns), TTL compatibility, and industrial temperature support-making it the optimal choice for legacy and new 5-V memory and peripheral decode where timing margin is critical.
Availability
SN74AHCT139PWR is available at Aetrix Electronics and suitable for industrial control systems, memory subsystems, and peripheral interface modules requiring stable component supply, long-lifecycle support, and guaranteed RoHS compliance.
Supply support for SN74AHCT139PWR 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 heritage in high-reliability logic families and industrial-grade qualification.
The SN74AHCT139PWR belongs to TI's AHCT logic series-engineered specifically for high-speed, 5-V memory decoding and data-routing applications where minimal propagation delay and TTL compatibility are essential design requirements.
FAQ
What is the maximum clock frequency supported by SN74AHCT139PWR?
The SN74AHCT139PWR is not a clocked device-it is a combinational decoder with no internal clock. Its usable switching frequency depends on system-level timing: with 8.5 ns max propagation delay and 15 pF load, it supports reliable operation in address decode paths up to ~100 MHz. The SN74AHCT139PWR does not impose a hard clock limit but must be timed within the setup/hold window of downstream devices like memories or peripherals.
Can SN74AHCT139PWR operate at 3.3 V?
No-SN74AHCT139PWR is specified only for 4.5 V to 5.5 V VCC operation per its recommended conditions. At 3.3 V, VIH (2 V) and VIL (0.8 V) thresholds may not be reliably met, and output drive (VOH/VOL) falls outside specification. For 3.3-V systems, consider SN74LVC139APWR or 74LCX139MTCX instead of SN74AHCT139PWR.
Does SN74AHCT139PWR have 5-V tolerant inputs when powered from 5 V?
Yes-SN74AHCT139PWR inputs are rated for VI up to 5.5 V (absolute max 7 V), making them fully 5-V tolerant when VCC = 5 V. This allows safe interfacing with higher-voltage control signals or legacy 5-V logic families without level shifters-consistent with the SN74AHCT139PWR's design purpose in mixed-signal industrial systems.
How are the enable inputs used in demultiplexing mode for SN74AHCT139PWR?
In demultiplexing mode, one enable input (e.g., 1G) serves as the data input, while 1A and 1B act as select lines. When 1G is low, the selected Y output goes low; when 1G is high, all Y outputs stay high. This 1-to-4 demux function requires no additional logic and is explicitly supported in the SN74AHCT139PWR functional table and datasheet description.
Is SN74AHCT139PWR pin-compatible with SN74HC139N?
No-SN74AHCT139PWR (TSSOP-16) and SN74HC139N (PDIP-16) share identical logic function and pin assignment (per top-view diagrams), but differ in package type, dimensions, thermal characteristics, and soldering requirements. They are functionally and electrically compatible across VCC ranges, but not mechanically interchangeable without PCB redesign. Always verify land patterns and reflow profiles for SN74AHCT139PWR separately.
SN74AHCT139PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 2:4
- Independent Circuits:
- 2
- Current - Output High, Low:
- 8mA, 8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74AHCT139PWR FAQ
1.How can I place an order for SN74AHCT139PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT139PWR 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 SN74AHCT139PWR reliable?
The price and inventory of SN74AHCT139PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT139PWR is usually 5 days.
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Once your SN74AHCT139PWR 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 SN74AHCT139PWR?
For technical support, including SN74AHCT139PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT139PWR requirements.
6.How does Aetrix verify that SN74AHCT139PWR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT139PWR 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 SN74AHCT139PWR meets industry standards.
7.What is the process for return or replacement of SN74AHCT139PWR?
All SN74AHCT139PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT139PWR, 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 SN74AHCT139PWR part is unused and in its original packaging.
Return procedure for SN74AHCT139PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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