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Texas Instruments SN74HC126DRE4
- Part No.:
- SN74HC126DRE4
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74HC126DRE4.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,039
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Product details
Overview
SN74HC126DRE4 from Texas Instruments is a quadruple 3-state buffer IC used for digital signal enabling and bus isolation in logic-level translation and data routing applications. It features four independent non-inverting buffers (Y = A), operates from 2 V to 6 V, supports –40°C to +85°C ambient temperature, delivers ≤31 ns propagation delay at 6 V, and drives up to 10 LSTTL loads.
For engineers reviewing the SN74HC126DRE4 datasheet, SN74HC126DRE4 pinout, SN74HC126DRE4 application, or SN74HC126DRE4 equivalent, key selection criteria include its 14-pin SOIC (D) package, 3-state output control per channel, CMOS input compatibility, low ICC (≤80 µA), and verified performance across industrial voltage and temperature ranges.
Technical Context
This device implements four identical, electrically isolated buffer gates with individual 3-state enable inputs (1OE–4OE), each performing Y = A in positive logic. All inputs are standard CMOS with high impedance and ≤10 pF input capacitance, while outputs feature balanced sourcing/sinking capability and defined three-state leakage (IOZ ≤ ±5 µA at 6 V).
Functional operation is governed by a truth table where OE = L forces Y = Z (high-impedance), and OE = H passes A to Y. Timing behavior is load-dependent: propagation delay (tpd) ranges from 11 ns (6 V, CL = 50 pF) to 39 ns (6 V, CL = 150 pF), with enable/disable delays tightly matched to tpd.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - enables direct interface with 3.3 V and 5 V logic families without level shifters. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation systems. |
| Propagation Delay | 11 ns max at 6 V, CL = 50 pF - ensures timing-critical bus gating with predictable setup/hold margins. |
| Output Drive | ±7.8 mA at 6 V - sufficient to drive 10 LSTTL loads or light capacitive buses (<70 pF recommended). |
| Three-State Leakage | ±5 µA max at 6 V - guarantees minimal bus contention during high-Z state in shared-data-path designs. |
| Input Capacitance | 10 pF max - limits loading on upstream drivers and preserves signal integrity in high-speed routing. |
| Quiescent Current | 80 µA max at 6 V - supports low-power standby modes in battery-backed or energy-conscious systems. |
Pinout & Package
SN74HC126DRE4 is housed in a 14-pin SOIC (D) package measuring 8.70 mm × 3.90 mm, with standard JEDEC MS-012AC footprint and gull-wing leads compatible with automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Output Enable (1OE, 2OE, 3OE, 4OE) | Active-low control per buffer channel; pulls corresponding Y into high-impedance when logic LOW. |
| 2, 5, 9, 12 | Input (1A, 2A, 3A, 4A) | CMOS-compatible buffered input; accepts 2–6 V logic levels with ≤10 pF loading. |
| 3, 6, 8, 11 | Output (1Y, 2Y, 3Y, 4Y) | Non-inverting 3-state output; sources/sinks up to ±7.8 mA and enters high-Z when OE = L. |
| 7 | GND | Logic ground reference; must be low-impedance and decoupled locally with 0.1 µF capacitor. |
| 14 | VCC | Positive supply rail; requires dedicated 0.1 µF bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Individual 3-state enables | Four separate OE pins allow independent gating of each buffer-enabling flexible bus arbitration and partial-bus isolation. |
| Wide supply range | 2 V–6 V operation permits interoperability across legacy 5 V, modern 3.3 V, and mixed-voltage system designs. |
| Low power consumption | ICC ≤ 80 µA at 6 V reduces static power in always-on logic interfaces and extends battery life in portable systems. |
| CMOS input compatibility | Standard CMOS inputs eliminate need for external pull-ups/pull-downs and reduce board-level component count. |
| Controlled output transition | Transition time (tt) as low as 6 ns at 6 V ensures clean edge rates without excessive EMI or ringing on properly terminated traces. |
Applications
| Industrial Bus Isolation | Microcontroller GPIO Expansion |
|---|---|
|
Use Scenario: Isolating multiple sensor modules from a central PLC backplane during firmware updates or fault recovery. IC Role / Device Role / Timing Role: SN74HC126DRE4 acts as a bidirectional bus gate, enabling/disabling data flow per module using discrete OE signals synchronized to system reset sequences. Use Value: Prevents bus contention and spurious writes during hot-swap events, leveraging its guaranteed high-impedance state (IOZ ≤ ±5 µA) and fast disable delay (≤31 ns). |
Use Scenario: Expanding limited GPIO count on an ARM Cortex-M4 MCU to drive eight external LEDs and two 7-segment displays. IC Role / Device Role / Timing Role: SN74HC126DRE4 provides four buffered, 3-state outputs per package-used in parallel with OE tied to MCU GPIOs to time-multiplex display segments and LED banks. Use Value: Delivers consistent 6 V output swing and ±7.8 mA drive per channel, eliminating external transistor buffers and reducing BOM cost and PCB area. |
| Legacy System Interface Adapter | Test Equipment Signal Routing |
|
Use Scenario: Interfacing a 5 V TTL-based test fixture controller with a 3.3 V FPGA development board via shared JTAG and UART lines. IC Role / Device Role / Timing Role: SN74HC126DRE4 serves as a unidirectional level translator and enable-controlled signal pass-through, with VCC = 3.3 V and inputs driven from 5 V via current-limiting resistors. Use Value: Tolerates 5 V inputs safely (VIH = 4.2 V at VCC = 6 V; VIH = 3.15 V at VCC = 4.5 V), avoids latch-up risk, and maintains <36 ns propagation delay for real-time debug signaling. |
Use Scenario: Routing calibrated analog trigger signals and digital pattern generator outputs through a modular ATE rack with selectable path switching. IC Role / Device Role / Timing Role: SN74HC126DRE4 functions as a digitally controlled signal gate-OE lines driven by FPGA configuration registers to activate/deactivate specific test paths without mechanical relays. Use Value: Provides sub-40 ns enable/disable timing and <10 pF input capacitance, preserving signal fidelity for ≤10 MHz trigger edges and minimizing path skew across 16-channel test fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT126DR | TTL-compatible input thresholds (VIH = 2 V min at VCC = 4.5 V); otherwise identical pinout, timing, and drive. | Better suited for direct connection to legacy 5 V TTL outputs without pull-up resistors. | Select SN74HCT126DR when interfacing with older 5 V TTL logic; use SN74HC126DRE4 for pure CMOS or mixed 3.3/5 V systems requiring higher noise immunity. |
| 74LVC126APW | Lower VCC range (1.65–5.5 V), smaller TSSOP-14 package (5.0 × 4.4 mm), and faster tpd (≤2.8 ns at 3.3 V). | Optimized for space-constrained, high-speed 3.3 V applications; not rated for 6 V operation. | Choose 74LVC126APW for compact, low-voltage designs needing <3 ns delay; retain SN74HC126DRE4 for 6 V tolerance, industrial temp, and SOIC layout compatibility. |
Compared with SN74HCT126DR and 74LVC126APW, SN74HC126DRE4 uniquely balances 2–6 V flexibility, industrial temperature rating, SOIC manufacturability, and proven reliability in long-lifecycle industrial controllers-making it the preferred choice where voltage headroom and qualification stability outweigh ultra-low delay or footprint minimization.
Availability
SN74HC126DRE4 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for SN74HC126DRE4 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 ICs.
SN74HC126DRE4 belongs to the SN74HC high-speed CMOS logic family, designed specifically for robust, low-power digital interfacing in industrial, automotive, and communications systems where voltage flexibility and timing predictability are critical.
FAQ
What is the maximum supply voltage rating for SN74HC126DRE4?
The absolute maximum supply voltage for SN74HC126DRE4 is 7 V, but the recommended operating range is 2 V to 6 V. Operation above 6 V risks exceeding absolute maximum ratings and may cause permanent damage. All electrical characteristics-including VOH, VOL, and tpd-are specified and guaranteed only within the 2–6 V range per the official Texas Instruments datasheet revision F (April 2021).
Does SN74HC126DRE4 support 3.3 V logic levels?
Yes, SN74HC126DRE4 fully supports 3.3 V operation: VIH is guaranteed ≥2.31 V (70% of 3.3 V) and VIL ≤0.99 V (30% of 3.3 V) at VCC = 3.3 V, meeting standard CMOS input thresholds. Its 2–6 V supply range and 3.3 V-compatible timing (tpd ≤20 ns at CL = 50 pF) make SN74HC126DRE4 ideal for mixed-voltage 3.3 V/5 V system interfaces.
How many independent channels does SN74HC126DRE4 contain?
SN74HC126DRE4 contains four completely independent buffer channels, each with its own input (A), output (Y), and active-low output enable (OE). Channels operate electrically isolated-no internal coupling-and can be enabled or disabled individually, enabling selective bus segmentation or multi-path signal routing in a single 14-pin SOIC package.
What is the thermal resistance (RθJA) of SN74HC126DRE4 in its SOIC package?
The junction-to-ambient thermal resistance (RθJA) for SN74HC126DRE4 in the SOIC (D) package is 133.6°C/W, as specified in Section 6.3 of the TI datasheet. This value assumes standard JEDEC 2-layer board conditions and confirms suitability for natural-convection cooling in industrial enclosures without forced airflow or heatsinking under typical load conditions.
Can unused inputs on SN74HC126DRE4 be left floating?
No, unused inputs on SN74HC126DRE4 must never be left floating. Standard CMOS inputs exhibit undefined states when unterminated, risking oscillation, increased ICC, and potential device damage. Per TI's layout guidelines, all unused inputs must be tied directly to VCC or GND-or via a 10-kΩ pull-up/down resistor-to maintain stable logic levels and ensure reliable operation of SN74HC126DRE4 in production systems.
SN74HC126DRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 1
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74HC126DRE4 FAQ
1.How can I place an order for SN74HC126DRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC126DRE4 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 SN74HC126DRE4 reliable?
The price and inventory of SN74HC126DRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC126DRE4 is usually 5 days.
3.What payment methods are accepted for SN74HC126DRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC126DRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC126DRE4?
SN74HC126DRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC126DRE4 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 SN74HC126DRE4?
For technical support, including SN74HC126DRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC126DRE4 requirements.
6.How does Aetrix verify that SN74HC126DRE4 is sourced from the original manufacturer or authorized distributors?
All SN74HC126DRE4 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 SN74HC126DRE4 meets industry standards.
7.What is the process for return or replacement of SN74HC126DRE4?
All SN74HC126DRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC126DRE4, 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 SN74HC126DRE4 part is unused and in its original packaging.
Return procedure for SN74HC126DRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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