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Texas Instruments 74AC11138DRG4
- Part No.:
- 74AC11138DRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74AC11138DRG4.pdf
- Description:
- IC DECODER/DEMUX 1X3:8 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,727
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Product details
Overview
74AC11138DRG4 from Texas Instruments is a 3-line to 8-line decoder/demultiplexer in SOIC-16 package, designed for high-speed memory decoding and data routing with propagation delays as low as 5.1 ns (tPLH, VCC = 5 V), 3.3–5.5 V supply operation, and three independent enable inputs (G1 active-high, G2A/G2B active-low) enabling flexible cascading. It serves in address decoding for SRAM/ROM systems where sub-8 ns delay and noise-immune layout are critical.
For engineers reviewing the 74AC11138DRG4 datasheet, 74AC11138DRG4 pinout, 74AC11138DRG4 application, or 74AC11138DRG4 equivalent, this page delivers verified functional modes, real-world switching characteristics at both 3.3 V and 5 V, thermal resistance (130°C/W), latch-up immunity (500 mA at 125°C), and precise pin-level design meaning - all confirmed from TI's SCAS042C production datasheet.
Technical Context
The 74AC11138DRG4 implements positive-logic 3-to-8 decoding with three enable inputs that support hierarchical expansion: two active-low (G2A, G2B) and one active-high (G1) enable allow direct 24-line decoding without external inverters and 32-line decoding with only one inverter. Its EPIC™ 1-µm CMOS process ensures rail-to-rail output swing and low input capacitance (3.5 pF).
Functional mode selection is determined solely by binary inputs A/B/C and the logical AND of enables: outputs Y0–Y7 go low only when G1 = HIGH and G2A = G2B = LOW, while all outputs remain HIGH otherwise. Propagation delay asymmetry (tPLH vs tPHL) is specified separately per input group (select lines A/B/C, G1, or G2A/G2B), confirming distinct internal path timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 5.5 V - supports mixed-voltage system interfacing and legacy 5 V TTL compatibility |
| Propagation Delay (tPLH, VCC = 5 V) | 5.1 ns max (G1 → Y) - enables integration into sub-10 ns memory access cycles without adding system latency |
| Output Drive (IOL, VCC = 5.5 V) | 24 mA - sufficient to drive 10 LSTTL loads or terminate short PCB traces without buffering |
| Input Capacitance (Ci) | 3.5 pF - minimizes loading on upstream logic and preserves signal integrity in high-frequency buses |
| Junction-to-Ambient Thermal Resistance (RθJA) | 130°C/W (SOIC-16) - defines maximum power dissipation (≤385 mW at ΔT = 50°C) before derating |
| Latch-Up Immunity | 500 mA typical at 125°C - exceeds JEDEC JESD78 Class II requirements, ensuring robustness in industrial environments |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial temperature range operation |
Pinout & Package
74AC11138DRG4 is packaged in 16-pin SOIC (D) with 9.9 mm × 6.0 mm body size, center-aligned VCC (pin 12) and GND (pin 4) to reduce simultaneous switching noise - a layout-critical feature for high-speed memory subsystems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 5–8, 16 | Y1–Y7, Y0 | Active-low decoded outputs - each asserts LOW only when selected; all HIGH otherwise, enabling wired-OR expansion |
| 9, 10 | G2B, G2A | Active-low enable inputs - both must be LOW for decode to activate; used for chip select stacking without inverters |
| 11 | G1 | Active-high enable input - provides polarity flexibility; combined with G2A/G2B, forms 3-input AND gate for global enable control |
| 13–15 | C, B, A | Binary address inputs (MSB to LSB) - determine which Yx output goes LOW; compatible with standard address bus routing |
| 4 | GND | Ground reference - center-pin placement reduces ground bounce during multi-output switching |
| 12 | VCC | Power supply - center-pin placement minimizes supply noise coupling into adjacent signal pins |
Key Features
| Feature | Design Value |
|---|---|
| Three enable inputs (G1, G2A, G2B) | Enables 24-line decoding without external inverters - reduces component count and board area in multi-chip memory systems |
| Center-pin VCC and GND | Reduces high-speed switching noise by symmetric current return paths - critical for maintaining signal integrity below 10 ns edges |
| EPIC™ 1-µm CMOS process | Delivers 5.1 ns propagation delay at 5 V while maintaining 500 mA latch-up immunity - balances speed, robustness, and power efficiency |
| 5.5 V absolute max rating | Allows safe operation during 5 V system power-up transients and brown-out recovery without damage |
| 3.5 pF input capacitance | Minimizes capacitive loading on microcontroller or FPGA address lines - preserves rise/fall times in dense routing |
Applications
| SRAM Address Decoding | ROM Memory Selection |
|---|---|
Use Scenario: Selecting one of eight 64 KB SRAM banks in a 512 KB memory subsystem using A16–A18 address bits. IC Role / Device Role / Timing Role: 3-to-8 decoder mapping upper address bits to individual chip-enable (CE#) signals; operates in parallel with memory access cycle. Use Value: 5.1 ns tPLH ensures CE# assertion occurs within first 10% of typical 60 ns SRAM access time - no wait states added. |
Use Scenario: Enabling specific ROM segments (e.g., boot loader, firmware, configuration tables) in an embedded controller based on mode pins. IC Role / Device Role / Timing Role: Demultiplexer converting 3-bit mode register output into eight independent ROM select lines. Use Value: Three enable inputs allow hierarchical gating - e.g., G1 tied to reset#, G2A/G2B controlled by software - enabling dynamic ROM partitioning. |
| Peripheral I/O Multiplexing | Industrial PLC Backplane Routing |
Use Scenario: Routing UART, SPI, and I²C signals from a single microcontroller port to eight isolated sensor nodes via discrete enable lines. IC Role / Device Role / Timing Role: Demultiplexer using G1 as master enable and A/B/C as node ID - converts serial command to parallel peripheral activation. Use Value: Active-low outputs directly drive optocoupler LEDs or MOSFET gates without level-shifting - simplifies isolation interface design. |
Use Scenario: Distributing diagnostic clock or test strobe signals across 8 I/O modules in a modular PLC chassis. IC Role / Device Role / Timing Role: Synchronized signal router with G2A/G2B tied to backplane arbitration lines and G1 to system sync pulse. Use Value: Center-pin VCC/GND suppresses crosstalk between routed clocks and adjacent analog I/O channels - maintains ±0.5% timing jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-to-8 decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC138PWR | Slower propagation delay (21 ns @ 5 V), lower drive (4 mA), wider operating range (2–6 V) | Better suited for battery-powered or low-power logic; insufficient for sub-10 ns memory systems | Select when power budget < 10 µA/MHz dominates over speed; not drop-in for 74AC11138DRG4 timing-critical designs |
| 74ACT138SCX | Same AC-family speed (5.5 ns), but obsolete PDIP-only packaging; no SOIC/TSSOP variants available | Limited to through-hole prototyping or legacy repair; lacks RoHS-compliant tape-and-reel supply chain | Use only for legacy board rework; 74AC11138DRG4 offers identical performance with modern SOIC packaging and active supply chain |
Compared with SN74HC138PWR and 74ACT138SCX, the 74AC11138DRG4 uniquely combines sub-6 ns propagation delay, 24 mA drive strength, and active SOIC-16 supply - making it the only viable choice for new industrial memory subsystems requiring both speed and manufacturability.
Availability
74AC11138DRG4 is available at Aetrix Electronics and suitable for high-speed memory decoding, industrial PLC backplane routing, and embedded peripheral multiplexing requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for 74AC11138DRG4 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 over 50 years of innovation in high-reliability logic families.
The 74AC logic family - including the 74AC11138DRG4 - was engineered for high-speed memory and data-routing systems demanding nanosecond-scale timing precision, low-noise layout compatibility, and industrial temperature resilience.
FAQ
What is the maximum propagation delay of the 74AC11138DRG4 at 5 V supply?
The 74AC11138DRG4 has a maximum propagation delay of 5.1 ns (tPLH) from G1 to any Y output and 5.7 ns (tPLH) from A/B/C inputs to any Y output, measured under recommended operating conditions (VCC = 5 V ± 0.5 V, TA = 25°C). These values are guaranteed in the TI SCAS042C datasheet and reflect actual silicon performance - not typical-only figures.
Does the 74AC11138DRG4 support 3.3 V operation?
Yes, the 74AC11138DRG4 is fully specified for 3.3 V operation: VCC = 3.3 V ± 0.3 V, with propagation delays up to 8.3 ns (tPLH, A/B/C → Y) and output drive of 12 mA (IOL). Its VIH/VIL thresholds scale with VCC, ensuring reliable interfacing with 3.3 V microcontrollers and FPGAs without level shifters.
How are the enable inputs configured on the 74AC11138DRG4?
The 74AC11138DRG4 uses three enable inputs: G1 (active-high, pin 11), G2A (active-low, pin 10), and G2B (active-low, pin 9). All three must be asserted simultaneously (G1 = HIGH, G2A = G2B = LOW) for decoding to occur. This configuration allows cascading - for example, connecting G2A/G2B to higher-order address bits and G1 to a global chip-select line.
What package type is used for the 74AC11138DRG4?
The 74AC11138DRG4 is supplied in a 16-pin SOIC (D) package measuring 9.9 mm × 6.0 mm with center-aligned VCC (pin 12) and GND (pin 4). This layout minimizes high-speed switching noise - a key requirement for memory subsystems - and is RoHS-compliant with NIPDAU lead finish and Level-1 MSL rating.
Can the 74AC11138DRG4 be used as a demultiplexer?
Yes, the 74AC11138DRG4 functions as a 1-to-8 demultiplexer when one enable input (e.g., G1) is used as the data input and A/B/C serve as select lines. In this mode, the selected Yx output mirrors the G1 logic state (inverted due to active-low output), enabling serial-to-parallel data distribution - confirmed in TI's functional mode table and application schematics.
74AC11138DRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- 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 3:8
- Independent Circuits:
- 1
- Current - Output High, Low:
- 24mA, 24mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
74AC11138DRG4 FAQ
1.How can I place an order for 74AC11138DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC11138DRG4 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 74AC11138DRG4 reliable?
The price and inventory of 74AC11138DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC11138DRG4 is usually 5 days.
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74AC11138DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC11138DRG4 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 74AC11138DRG4?
For technical support, including 74AC11138DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC11138DRG4 requirements.
6.How does Aetrix verify that 74AC11138DRG4 is sourced from the original manufacturer or authorized distributors?
All 74AC11138DRG4 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 74AC11138DRG4 meets industry standards.
7.What is the process for return or replacement of 74AC11138DRG4?
All 74AC11138DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with 74AC11138DRG4, 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 74AC11138DRG4 part is unused and in its original packaging.
Return procedure for 74AC11138DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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