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Texas Instruments SN74LV126ANS
- Part No.:
- SN74LV126ANS
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LV126ANS.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,622
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Product details
Overview
SN74LV126ANS from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, designed for 2V–5.5V VCC operation in mixed-voltage digital interfaces. It features 6.5ns maximum propagation delay at 5V, Ioff support for live insertion and partial power-down, and 5.5V-tolerant inputs enabling level translation. It is used in server backplane buffering and network switch data path isolation.
For engineers reviewing the SN74LV126ANS datasheet, SN74LV126ANS pinout, SN74LV126ANS application, or SN74LV126ANS equivalent, key selection criteria include 3-state timing (ten/tdis), output drive capability (±16mA at 4.5V), voltage translation compatibility, and SOP-14 thermal performance (RθJA = 89.6°C/W).
Technical Context
The SN74LV126ANS implements four independent noninverting buffers, each with dedicated active-high output-enable (OE) control. Each channel transitions to high-impedance when OE is low, and passes A→Y when OE is high - per positive-logic function table. No internal logic interdependence exists between channels.
It uses advanced CMOS process technology to achieve rail-to-rail input tolerance (VI up to 5.5V regardless of VCC), low dynamic ground bounce (VOLP < 0.8V at 3.3V), and robust latch-up immunity (>250mA per JESD17). Operating temperature range is –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 5.5V - supports mixed-voltage system interfacing (e.g., 3.3V logic driving 5V bus) |
| tpd (max) | 6.5ns at VCC = 5V, CL = 15pF - ensures sub-7ns signal routing in high-speed control paths |
| Ioff Current | ±5µA at VCC = 0V - enables safe live insertion and back-drive protection during partial power-down |
| IOH/IOL | –16mA / +16mA at VCC = 4.5V - drives standard TTL loads and moderate-capacitance buses |
| Input Voltage Tolerance | 0V to 5.5V independent of VCC - allows 5V signals into 2.5V/3.3V systems without external level shifters |
| Operating Temperature | –40°C to +125°C - qualified for industrial and extended-temperature embedded networking hardware |
| ESD Rating (HBM) | ±2000V - meets JEDEC JS-001 for robust handling in automated assembly environments |
Pinout & Package
SOP-14 (NS) package: 10.2mm × 7.8mm body, 1.27mm pitch, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 4OE, 3OE, 2OE | Active-high output enable (4×) | Independent per-channel 3-state control; tie low via pulldown resistor for power-up high-Z safety |
| 1A–4A | Buffer input (4×) | 5.5V-tolerant CMOS inputs; accept logic levels above VCC for down-translation applications |
| 1Y–4Y | Buffer output (4×) | Noninverting 3-state outputs; VOL ≤ 0.55V @ 16mA ensures solid low-level signaling |
| GND (Pin 7) | Ground reference | Primary return path for all I/O and supply currents; requires low-inductance PCB connection |
| VCC (Pin 14) | Positive supply | Single supply pin supporting 2V–5.5V; requires local 0.1µF bypass capacitor per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range | 2V–5.5V operation enables single part to serve multiple voltage domains in modular systems |
| 5.5V-tolerant inputs | Allows direct interface of legacy 5V peripherals to modern 3.3V or 2.5V controllers without external translators |
| Ioff functionality | Prevents current backflow during hot-swap or partial power-down, protecting powered subsystems |
| Low ground bounce | VOLP < 0.8V at 3.3V ensures stable reference integrity in noise-sensitive mixed-signal environments |
| Latch-up immunity | Exceeds 250mA per JESD17 - eliminates risk of destructive latch-up under transient overvoltage conditions |
Applications
| Server Backplane Buffering | Network Switch Data Path Isolation |
|---|---|
Use Scenario: Isolating control signals between hot-pluggable line cards and central switching fabric in 1U rack servers. IC Role / Device Role / Timing Role: Quadruple 3-state buffer providing direction-controlled signal gating and voltage domain bridging between 3.3V management MCU and 5V backplane logic. Use Value: Ioff prevents back-driving during card insertion; 6.5ns tpd maintains timing margin in PCIe Gen2 sideband signal routing. |
Use Scenario: Enabling/disabling parallel status lines (e.g., link-up, error flags) between PHY and MAC layers in Layer-2 Ethernet switches. IC Role / Device Role / Timing Role: Independent per-channel OE control allows selective assertion of multi-bit status vectors without bus contention. Use Value: 16mA drive strength sustains signal integrity across 15cm FR4 traces; 125°C rating supports fanless switch chassis design. |
| Electronic Point-of-Sale Terminal Interface | Set-Top Box HDMI CEC Bus Conditioning |
Use Scenario: Level-shifting and buffering GPIO lines between ARM-based main processor (3.3V) and legacy 5V peripheral modules (receipt printer, cash drawer). IC Role / Device Role / Timing Role: Voltage-translating bus buffer enabling bidirectional control signal exchange across incompatible supply rails. Use Value: 5.5V-tolerant inputs eliminate discrete level shifter components; SOP-14 footprint simplifies layout in space-constrained retail enclosures. |
Use Scenario: Driving CEC (Consumer Electronics Control) bus signals from SoC GPIO to HDMI connector while suppressing ringing on long cable runs. IC Role / Device Role / Timing Role: Low-drive buffer with controlled edge rates minimizes EMI and overshoot on shared 1-wire CEC bus. Use Value: VOLP < 0.8V and VOHV > 2.3V at 3.3V ensure reliable logic thresholds despite cable-induced reflections and noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC126APW | Lower VCC min (1.65V), higher speed (4.5ns tpd at 3.3V), TSSOP-14 package | Better suited for ultra-low-voltage portable designs; not drop-in due to different package and thermal profile | Select when operating below 2V or requiring tighter timing margins; verify PCB land pattern compatibility |
| 74LVX126M | Narrower VCC range (2.7V–3.6V), lower drive (±12mA), SOIC-14 only | Optimized for 3.3V-only systems; lacks 5.5V input tolerance and Ioff support | Choose only for cost-sensitive 3.3V-only applications where live insertion is not required |
Compared with SN74LV126ANS, SN74LVC126APW offers faster timing but narrower voltage flexibility and different packaging, while 74LVX126M sacrifices input tolerance and Ioff for lower cost in fixed 3.3V systems - making SN74LV126ANS the optimal choice for mixed-rail, hot-swap-capable infrastructure equipment.
Availability
SN74LV126ANS is available at Aetrix Electronics and suitable for server backplane buffering, network switch data path isolation, and electronic point-of-sale terminal interface requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for SN74LV126ANS 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 company specializing in analog and embedded processing solutions, with leadership in logic, power management, and interface ICs for industrial, automotive, and communications markets.
The SN74LV126ANS belongs to TI's LV-A family of low-voltage, high-noise-immunity CMOS logic devices, engineered for robust signal integrity in mixed-voltage digital systems with hot-swap and partial-power-down requirements.
FAQ
What is the maximum propagation delay of the SN74LV126ANS at 5V supply?
The SN74LV126ANS has a maximum propagation delay (tpd) of 6.5ns at VCC = 5V ±0.5V with CL = 15pF and TA = 25°C, as specified in Section 5.8 of the official datasheet. This value represents worst-case delay across process, voltage, and temperature corners, ensuring timing margin for synchronous control signal routing in high-density PCB layouts.
Does the SN74LV126ANS support live insertion in powered systems?
Yes, the SN74LV126ANS supports live insertion via its Ioff feature: when VCC = 0V, Ioff is limited to ±5µA, preventing damaging current flow between powered and unpowered sections. This allows safe insertion into partially powered backplanes or hot-swappable modules without disrupting adjacent circuitry - a key requirement confirmed in Section 7.3 and Table 5.5.
Can the SN74LV126ANS translate 5V input signals to a 3.3V system?
Yes, the SN74LV126ANS accepts input voltages up to 5.5V regardless of VCC level, enabling direct 5V-to-3.3V down-translation. When VCC = 3.3V, VIH is defined as VCC × 0.7 = 2.31V and VIL as VCC × 0.3 = 0.99V - both comfortably met by standard 5V TTL logic levels, eliminating need for external level shifters per Section 5.3 and 7.3.
What is the recommended power supply decoupling for the SN74LV126ANS?
Texas Instruments recommends a 0.1µF ceramic bypass capacitor placed as close as possible to the VCC (Pin 14) and GND (Pin 7) pins of the SN74LV126ANS. For systems with multiple supply pins or high-frequency noise, paralleling with a 1µF capacitor improves broadband suppression - per Section 8.3 and Layout Guidelines in the datasheet.
Is the SN74LV126ANS pin-compatible with other 14-pin bus buffers in TI's LV family?
Yes, the SN74LV126ANS shares identical pinout (SOP-14) and functional mapping with SN74LV126ADR (SOIC-14) and SN74LV126APWR (TSSOP-14), including 1OE–4OE, 1A–4A, 1Y–4Y, GND, and VCC assignments. However, thermal resistance (RθJA = 89.6°C/W) and package dimensions differ - requiring layout verification before substitution.
SN74LV126ANS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 14-SOIC (0.209", 5.30mm 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-SO
SN74LV126ANS FAQ
1.How can I place an order for SN74LV126ANS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV126ANS 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 SN74LV126ANS reliable?
The price and inventory of SN74LV126ANS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV126ANS is usually 5 days.
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4.How is shipping managed for SN74LV126ANS?
SN74LV126ANS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV126ANS 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 SN74LV126ANS?
For technical support, including SN74LV126ANS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV126ANS requirements.
6.How does Aetrix verify that SN74LV126ANS is sourced from the original manufacturer or authorized distributors?
All SN74LV126ANS 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 SN74LV126ANS meets industry standards.
7.What is the process for return or replacement of SN74LV126ANS?
All SN74LV126ANS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV126ANS, 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 SN74LV126ANS part is unused and in its original packaging.
Return procedure for SN74LV126ANS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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