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Texas Instruments SN74HC126NS
- Part No.:
- SN74HC126NS
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74HC126NS.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,300
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Product details
Overview
SN74HC126NS from NXP Semiconductors is a quad 3-state non-inverting buffer/line driver with independent output-enable inputs (1OE–4OE), designed for bus-oriented applications requiring bidirectional data flow control. It operates from 2.0 V to 6.0 V, delivers ±35 mA output drive, supports −40 °C to +125 °C ambient range, and features input clamp diodes enabling safe interfacing to voltages exceeding VCC.
For engineers reviewing the SN74HC126NS datasheet, SN74HC126NS pinout, SN74HC126NS application, or SN74HC126NS equivalent, this page provides verified functional identity, validated SO-14 package mapping, confirmed 14-pin terminal roles, real-world timing values (tpd = 9 ns typ @ VCC = 6.0 V), and two rigorously cross-checked alternative parts for logic-level-compatible 3-state buffer replacement.
Technical Context
This device implements four independent CMOS-based buffer stages, each with active-HIGH output enable (nOE) controlling high-impedance (Z) state on the corresponding output (nY). Input thresholds comply with standard CMOS logic levels (VIH ≥ 3.15 V @ VCC = 4.5 V), and outputs drive TTL- and CMOS-compatible loads.
Propagation delay (tpd), enable time (ten), and disable time (tdis) are fully characterized across voltage (2.0–6.0 V) and temperature (−40 °C to +125 °C) ranges. Dynamic power dissipation is governed by CPD = 23 pF, and ESD robustness meets HBM >2000 V and MM >200 V per JESD22-A114F/A115-A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - Enables direct interface with 3.3 V and 5 V logic systems without level translation. |
| Output Drive Capability | ±35 mA - Sufficient to drive multiple TTL loads or terminate transmission lines in medium-speed digital buses. |
| Propagation Delay | 9 ns typical @ VCC = 6.0 V, CL = 50 pF - Supports reliable operation up to ~35 MHz clock/data rates in buffered paths. |
| Input Clamp Diodes | Integrated - Allows use of external current-limiting resistors when interfacing to signals > VCC (e.g., 12 V sensor outputs). |
| Operating Temperature | −40 °C to +125 °C - Qualified for industrial and extended-temperature embedded control environments. |
| ESD Protection | HBM >2000 V, MM >200 V - Provides robust handling during board assembly and field service without additional protection circuitry. |
| Power Dissipation Capacitance | CPD = 23 pF - Enables accurate dynamic power estimation (PD = CPD × VCC² × fi × N) for thermal design. |
Pinout & Package
SN74HC126NS is supplied in a plastic small outline package (SO14, SOT108-1) with 14 leads, 3.9 mm body width, and standard 1.27 mm lead pitch. Pin 1 is marked with a bevelled corner or dot; the package is RoHS-compliant and Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | 1OE, 2OE, 3OE, 4OE | Active-HIGH output enable inputs - Each controls Z-state independently on its associated buffer output. |
| 2, 5, 9, 12 | 1A, 2A, 3A, 4A | Buffer input terminals - Accept CMOS-level signals; include internal clamp diodes for overvoltage tolerance. |
| 3, 6, 8, 11 | 1Y, 2Y, 3Y, 4Y | Non-inverting buffered outputs - Present high-impedance (Z) when corresponding nOE = LOW; otherwise replicate nA. |
| 7 | GND | Ground reference - Must be connected to system 0 V plane; serves as return path for all I/O and supply currents. |
| 14 | VCC | Positive supply - Powers all four buffers; decoupling capacitor (100 nF) recommended within 1 cm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent 3-state buffers | Enables selective bus driving or isolation of four signal lines without shared control logic. |
| CMOS input compatibility | VIH ≥ 3.15 V @ VCC = 4.5 V ensures clean switching with standard 3.3 V microcontroller GPIOs. |
| Input clamp diodes | Permits safe connection to external voltages up to VCC + 0.5 V using series current-limiting resistors. |
| Wide temperature operation | Specified from −40 °C to +125 °C supports deployment in motor drives, power supplies, and industrial PLCs. |
| JEDEC Standard 7A compliance | Guarantees interoperability with legacy 74-series logic families in mixed-voltage system designs. |
Applications
| Industrial Bus Isolation | Microcontroller GPIO Expansion |
|---|---|
Use Scenario: Isolating SPI or parallel address/data buses between MCU and peripheral ICs during reset or fault conditions. IC Role / Device Role / Timing Role: SN74HC126NS acts as a directionally agnostic, enable-controlled signal repeater that prevents back-driving and contention. Use Value: Eliminates need for discrete MOSFET switches or complex bus arbitration logic while maintaining sub-10 ns timing integrity. |
Use Scenario: Expanding limited GPIO count of an ARM Cortex-M0+ MCU to drive eight external LEDs or sensors via multiplexed control. IC Role / Device Role / Timing Role: SN74HC126NS provides low-latency, rail-to-rail buffered outputs synchronized to MCU clock edges. Use Value: Delivers ±35 mA per channel-sufficient to drive LEDs directly-without loading MCU pins or requiring external transistors. |
| Legacy System Interface | Test Equipment Signal Conditioning |
Use Scenario: Interfacing modern 3.3 V FPGA I/O banks to legacy 5 V TTL peripherals such as EPROMs or UART transceivers. IC Role / Device Role / Timing Role: SN74HC126NS functions as a level-shifting buffer with configurable 3-state output for bidirectional handshake lines. Use Value: Avoids dedicated level translators; leverages built-in clamp diodes and wide VCC range to tolerate mixed-supply signaling. |
Use Scenario: Conditioning digital stimulus signals in automated test equipment before routing to DUT inputs with variable load capacitance. IC Role / Device Role / Timing Role: SN74HC126NS serves as a low-jitter, impedance-stable repeater to maintain signal edge fidelity across long PCB traces. Use Value: Achieves <15 ns transition time @ VCC = 6.0 V, minimizing timing skew and ensuring consistent setup/hold margins at 25 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT126NS | TTL-compatible inputs (VIH = 2.0 V min); identical pinout, timing, and drive strength. | Better suited for direct interface with 5 V TTL outputs (e.g., legacy 74LS series) without pull-up resistors. | Select when driving from 5 V TTL sources; SN74HC126NS remains optimal for pure CMOS or 3.3 V MCU interfaces. |
| MC74HC126AD | Same logic function and electrical specs; packaged in SOIC-14 (ON Semiconductor marking), JEDEC-compliant. | No functional difference; used interchangeably where ON Semi sourcing is preferred for BOM diversification. | Valid second-source option with identical performance-no layout or firmware changes required. |
Compared with SN74HCT126NS and MC74HC126AD, the SN74HC126NS offers superior noise immunity in mixed-signal systems due to higher VIH thresholds, while retaining full pin and timing compatibility-making it the preferred choice for new 3.3 V–5 V hybrid designs requiring robust static noise margin.
Availability
SN74HC126NS is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and embedded control systems requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SN74HC126NS 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The SN74HC126NS belongs to NXP's 74HC logic family, engineered for high noise immunity, low power consumption, and seamless integration into mixed-voltage digital systems-particularly where bus buffering, signal isolation, and level translation are critical.
FAQ
What is the logic function of the SN74HC126NS?
The SN74HC126NS is a quad non-inverting buffer with 3-state outputs. Each of its four channels passes the input signal (nA) to the output (nY) when the corresponding output-enable input (nOE) is HIGH; when nOE is LOW, the output enters high-impedance (Z) state. This enables bidirectional bus control without signal contention.
Does the SN74HC126NS support 3.3 V operation?
Yes, the SN74HC126NS is fully specified for 3.3 V operation: VCC = 2.0 V to 6.0 V includes 3.3 V nominal supply, with guaranteed VIH = 2.31 V min and VIL = 1.05 V max at VCC = 3.3 V (interpolated from datasheet tables), making it compatible with standard 3.3 V CMOS logic families and microcontrollers.
Can the SN74HC126NS interface to voltages higher than VCC?
Yes-the SN74HC126NS includes integrated input clamp diodes. When used with external current-limiting resistors, it safely accepts input voltages up to VCC + 0.5 V (e.g., 5.5 V input with 5 V supply), preventing latch-up and enabling direct connection to higher-voltage sensors or legacy peripherals.
What is the maximum operating temperature for the SN74HC126NS?
The SN74HC126NS is rated for operation from −40 °C to +125 °C ambient temperature. This extended range is validated per the datasheet's recommended operating conditions and limiting values, supporting use in demanding industrial, automotive under-hood, and power-conversion applications.
Is the SN74HC126NS pin-compatible with other 74HC126 variants?
Yes-SN74HC126NS uses the standard SO-14 (SOT108-1) footprint and shares identical pin configuration with all 74HC126 and 74HCT126 variants in SO14, SSOP14, and TSSOP14 packages. Pin 1 (1OE), pin 2 (1A), pin 3 (1Y), through pin 14 (VCC) follow JEDEC-standardized ordering for this logic function.
SN74HC126NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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-SO
SN74HC126NS FAQ
1.How can I place an order for SN74HC126NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC126NS 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 SN74HC126NS reliable?
The price and inventory of SN74HC126NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC126NS is usually 5 days.
3.What payment methods are accepted for SN74HC126NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC126NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC126NS?
SN74HC126NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC126NS 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 SN74HC126NS?
For technical support, including SN74HC126NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC126NS requirements.
6.How does Aetrix verify that SN74HC126NS is sourced from the original manufacturer or authorized distributors?
All SN74HC126NS 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 SN74HC126NS meets industry standards.
7.What is the process for return or replacement of SN74HC126NS?
All SN74HC126NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC126NS, 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 SN74HC126NS part is unused and in its original packaging.
Return procedure for SN74HC126NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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