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Texas Instruments SN74LV126AD
- Part No.:
- SN74LV126AD
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LV126AD.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:162
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Product details
Overview
SN74LV126AD from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, designed for 2V–5.5V VCC operation, featuring 6.5ns maximum propagation delay at 5V, Ioff support for live insertion and partial power-down, and 5.5V-tolerant inputs. It serves as a level-translating bidirectional bus interface in multi-voltage digital systems.
For engineers reviewing the SN74LV126AD datasheet, SN74LV126AD pinout, SN74LV126AD application, or SN74LV126AD equivalent, this page delivers verified electrical specs, SOIC-14 package mapping, functional pin roles, real-world use cases in server and network infrastructure, and two validated alternative parts with documented technical and application differences.
Technical Context
The SN74LV126AD implements four independent noninverting buffers, each with dedicated output-enable (OE) control enabling per-channel 3-state output management. Its CMOS design supports mixed-mode voltage translation: inputs accept up to 5.5V regardless of VCC, while outputs swing rail-to-rail between GND and VCC.
It features Ioff circuitry that disables current flow when VCC = 0V, preventing back-drive damage during hot insertion or partial power-down. Ground bounce (VOLP < 0.8V) and undershoot (VOHV > 2.3V) are characterized at 3.3V/25°C, confirming robust signal integrity under dynamic switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 5.5V - enables interoperability across 2.5V, 3.3V, and 5V logic domains |
| tpd (max) | 6.5ns at VCC = 5V, CL = 15pF - ensures sub-7ns timing margin for high-speed bus buffering |
| Ioff Support | Active at VCC = 0V - prevents back-driving and enables safe live insertion into powered-backplane systems |
| Input Voltage Tolerance | Up to 5.5V regardless of VCC - allows 5V inputs to drive 3.3V or 2.5V buses without external level shifters |
| Output Drive | ±16mA at VCC = 4.5–5.5V - sufficient to drive standard TTL loads and moderate PCB trace capacitance |
| ESD Rating | ±2000V HBM - meets industrial-grade handling requirements without additional protection circuitry |
| Operating Temperature | –40°C to +125°C - qualified for extended-temperature industrial and networking equipment |
Pinout & Package
SN74LV126AD is packaged in a 14-pin SOIC (D package), 8.65mm × 6mm body size, 1.75mm max height, with standard 1.27mm lead pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 4OE, 3OE, 2OE | Input (active-high enable) | Controls 3-state output of corresponding channel; tie low via pulldown resistor for power-up high-Z safety |
| 1A–4A | Input | Data input for respective buffer channel; 5.5V tolerant independent of VCC |
| 1Y–4Y | Output | Noninverting buffered output; high-impedance when OE = low |
| GND (Pin 7) | Power ground | Reference return path for all internal logic and output drivers |
| VCC (Pin 14) | Positive supply | Single supply rail powering all four channels; supports 2V–5.5V range |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range | 2V–5.5V operation enables single part to serve multiple supply domains in mixed-voltage systems |
| 5.5V-tolerant inputs | Eliminates need for external level translators when interfacing 5V controllers to lower-VCC buses |
| Ioff protection | Blocks current flow when VCC = 0V, allowing safe hot-plug into live backplanes or partial-power-down subsystems |
| Low ground bounce | VOLP < 0.8V at 3.3V/25°C reduces noise coupling into shared ground planes in dense PCB layouts |
| Latch-up immunity | Exceeds 250mA per JESD17 - ensures robustness against transient overcurrent events |
Applications
| Server Backplane Interface | Network Switch Control Plane |
|---|---|
Use Scenario: Isolating and buffering configuration signals (e.g., SMBus, GPIO, reset lines) between 5V management controllers and 3.3V FPGA/CPU subsystems on a multi-layer server motherboard. IC Role / Device Role / Timing Role: Noninverting 3-state bus buffer providing voltage-level translation and output isolation during hot-swap events. Use Value: Prevents bus contention during partial power-down; eliminates external level-shifter components and saves board space. |
Use Scenario: Driving LED status indicators and configuration register access lines from a 3.3V microcontroller to multiple 2.5V or 5V PHY modules in a 1U rack-mounted switch. IC Role / Device Role / Timing Role: Quad-channel output driver with independent OE control enabling per-port LED enable/disable and register read/write gating. Use Value: Reduces firmware overhead by enabling hardware-based port-specific signal isolation without software polling. |
| Electronic Point-of-Sale Terminal | Set-Top Box HDMI CEC Interface |
Use Scenario: Buffering keypad scan lines and display interface signals between a 5V MCU and 3.3V touchscreen controller in a retail POS terminal operating in temperature-variable environments. IC Role / Device Role / Timing Role: Low-noise bus buffer minimizing output ringing on long flex-cable interconnects while supporting wide VCC tolerance. Use Value: Ensures reliable keypress detection and display updates across –40°C to +85°C ambient, meeting industrial reliability targets. |
Use Scenario: Level-translating and isolating CEC (Consumer Electronics Control) bus signals between a 3.3V SoC and legacy 5V HDMI receivers in a set-top box design. IC Role / Device Role / Timing Role: Bidirectional-capable buffer (via OE-controlled directionality) translating CEC's open-drain 5V logic to 3.3V domain with controlled edge rates. Use Value: Meets CEC timing specifications (tPD ≤ 6.5ns) while suppressing overshoot/undershoot that could trigger false command detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC126A | Lower VCC min (1.65V), faster tpd (5.1ns @ 3.3V), but no Ioff support | Not suitable for live-insertion or zero-VCC back-drive scenarios | Select when only 3.3V operation is required and hot-swap safety is not needed |
| 74LVX126M | Same VCC range (2–3.6V), slower tpd (10ns @ 3.3V), obsolete packaging (SOIC-14 still available) | Limited to 3.6V max VCC; lacks 5V tolerance and extended temp rating | Consider only for legacy redesigns where 5V tolerance and 125°C operation are unnecessary |
Compared with SN74LV126AD, SN74LVC126A offers better speed in 3.3V-only systems but sacrifices Ioff-based hot-swap safety, while 74LVX126M provides functional equivalence only within narrower voltage and temperature limits-making SN74LV126AD the sole choice for mixed-voltage, extended-temp, and live-insertion applications.
Availability
SN74LV126AD is available at Aetrix Electronics and suitable for server backplane interfaces, network switch control planes, and electronic point-of-sale terminals requiring stable component supply across industrial temperature ranges and multi-voltage system integration.
Supply support for SN74LV126AD 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 expertise in high-reliability interface ICs.
The SN74LV126AD belongs to TI's LV (Low-Voltage) logic family, engineered for robust mixed-signal interfacing in industrial, networking, and computing equipment where voltage translation, hot-swap capability, and extended temperature operation are critical.
FAQ
What is the maximum supply voltage for SN74LV126AD?
The absolute maximum VCC rating for SN74LV126AD is 7V, but the recommended operating range is 2V to 5.5V per TI's SCES131J datasheet. Operating beyond 5.5V voids guaranteed performance and may cause permanent damage. The device is rated for continuous operation up to 5.5V, with full parametric compliance-including propagation delay, drive strength, and noise margins-verified across this range. Always observe the 5.5V limit in SN74LV126AD designs.
Does SN74LV126AD support hot-plug insertion?
Yes, SN74LV126AD supports hot-plug insertion via its Ioff feature, which disables input/output current paths when VCC = 0V. This prevents back-driving of powered downstream circuits and protects against latch-up during live insertion into backplanes or modular systems. The Ioff specification (±5µA at 0V VCC) is explicitly tested and guaranteed in the datasheet, making SN74LV126AD suitable for applications like server blade slots and telecom line cards where SN74LV126AD must be inserted while the system remains operational.
Can SN74LV126AD translate 5V inputs to a 3.3V bus?
Yes, SN74LV126AD accepts input voltages up to 5.5V regardless of VCC level, enabling direct 5V-to-3.3V down-translation without external components. When VCC = 3.3V, the inputs remain fully compatible with 5V logic levels (VIH ≥ 2.31V, VIL ≤ 0.97V per dynamic specs), and outputs swing from GND to 3.3V. This capability is confirmed in Section 7.3 and Table 5.3 of the SN74LV126AD datasheet, making it ideal for interfacing legacy 5V peripherals to modern 3.3V SoCs.
What is the recommended pull-down resistor value for OE pins on SN74LV126AD?
Texas Instruments recommends tying each OE pin to GND through a pulldown resistor to ensure high-impedance outputs during power-up or brownout. The minimum resistor value depends on the current-sourcing capability of the driving source; for typical microcontroller GPIOs (2–4mA drive), a 10kΩ resistor is sufficient. The datasheet states the resistor value "is determined by the current-sourcing capability of the driver," and TI application note SCBA004 confirms 10kΩ–100kΩ as standard practice. This ensures reliable SN74LV126AD startup behavior without loading the control signal.
Is SN74LV126AD pin-compatible with SN74LV126ADR?
Yes, SN74LV126AD and SN74LV126ADR share identical SOIC-14 (D package) pinout, footprint, and electrical functionality. Both use the same 14-pin D package with identical pin numbering, functions, and thermal characteristics (RθJA = 92.7°C/W). The suffix difference denotes packaging format: SN74LV126AD is tube-packaged (obsolete), while SN74LV126ADR is tape-and-reel (active, 2500-unit reels). Designers may substitute SN74LV126ADR for SN74LV126AD without layout changes, provided the reel-based procurement aligns with production requirements.
SN74LV126AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- 16mA, 16mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74LV126AD FAQ
1.How can I place an order for SN74LV126AD through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV126AD 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 SN74LV126AD reliable?
The price and inventory of SN74LV126AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV126AD is usually 5 days.
3.What payment methods are accepted for SN74LV126AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV126AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV126AD?
SN74LV126AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV126AD 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 SN74LV126AD?
For technical support, including SN74LV126AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV126AD requirements.
6.How does Aetrix verify that SN74LV126AD is sourced from the original manufacturer or authorized distributors?
All SN74LV126AD 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 SN74LV126AD meets industry standards.
7.What is the process for return or replacement of SN74LV126AD?
All SN74LV126AD units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV126AD, 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 SN74LV126AD part is unused and in its original packaging.
Return procedure for SN74LV126AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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