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Texas Instruments SN74LVC126ADR
- Part No.:
- SN74LVC126ADR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LVC126ADR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,323
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Product details
Overview
SN74LVC126ADR from Texas Instruments is a quadruple 3-state bus buffer gate operating from 1.65 V to 3.6 V, featuring 5.5 V-tolerant inputs, 4.7 ns maximum propagation delay at 3.3 V, and –40°C to +125°C temperature range. It serves as a level-translating driver in mixed-voltage digital interfaces such as MCU-to-peripheral data buses in consumer audio and display systems.
For engineers reviewing the SN74LVC126ADR datasheet, SN74LVC126ADR pinout, SN74LVC126ADR application, or SN74LVC126ADR equivalent, key selection criteria include 3-state output control timing (ten/tdis), input overvoltage tolerance, drive strength (24 mA at 3 V), and SOIC-14 package compatibility with legacy board layouts.
Technical Context
The SN74LVC126ADR implements four independent non-inverting buffers, each with dedicated active-low output-enable (OE) control. Its CMOS design supports bidirectional voltage translation: inputs accept up to 5.5 V regardless of VCC (1.65–3.6 V), enabling reliable interfacing between 5 V legacy logic and 3.3 V or lower subsystems.
Each buffer operates in one of two functional states: enabled (Y = A) when OE is low, or high-impedance when OE is high. Power-up/down robustness requires OE to be pulled low via an external resistor; thermal performance is optimized for SOIC-14 with RθJA = 127.8°C/W and junction-to-board resistance of 84.4°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables direct integration into 1.8 V, 2.5 V, and 3.3 V logic domains without level shifters. |
| Input Voltage Tolerance | Up to 5.5 V - Allows safe connection to 5 V outputs without clamping diodes or external protection. |
| tpd (Max) | 4.7 ns at VCC = 3.3 V - Supports clean signal integrity up to ~100 MHz clock/data rates in buffered bus applications. |
| IOL / IOH (Max) | 24 mA sink/source at VCC = 3 V - Drives ≥10 LVC loads or multiple capacitive traces without signal degradation. |
| Operating Temperature | –40°C to +125°C - Qualified for automotive infotainment, industrial SSD controllers, and telecom power management. |
| ESD Rating (HBM) | ±2000 V - Meets JEDEC JS-001 for robust handling in automated assembly and field-replaceable modules. |
Pinout & Package
SN74LVC126ADR uses the SOIC-14 (D) package: 8.65 mm × 6.00 mm body, 14-pin gull-wing lead frame, RoHS-compliant NiPdAu finish, MSL Level-1, and exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | 1OE, 2OE, 3OE, 4OE | Active-low enable inputs - Each controls one buffer's output state independently; must be pulled low externally during power sequencing. |
| 2, 5, 9, 12 | 1A, 2A, 3A, 4A | Buffer input terminals - Accept 5.5 V logic signals regardless of VCC; no external clamping required. |
| 3, 6, 8, 11 | 1Y, 2Y, 3Y, 4Y | Non-inverting 3-state outputs - High-impedance when corresponding OE is high; drive strength configurable per load. |
| 7 | GND | Ground reference - Must be connected to system ground plane; decoupling capacitor (0.1 µF) placed adjacent to Pin 14. |
| 14 | VCC | Power supply - Supplies all four buffers; requires local bypassing; tolerates 1.65–3.6 V with monotonic operation. |
Key Features
| Feature | Design Value |
|---|---|
| 5.5 V-tolerant inputs | Enables direct interface with 5 V microcontrollers or legacy peripherals without external level-shifting circuitry. |
| Independent 3-state control | Four separate OE pins allow selective bus isolation-critical for multi-master arbitration and hot-swap I/O expansion. |
| Low dynamic power | Cpd = 4 pF (outputs enabled, VCC = 3.3 V) minimizes switching current and reduces EMI in high-density PCB layouts. |
| High noise immunity | VIL = 0.35×VCC (min) and VIH = 0.65×VCC (min) ensure reliable logic detection across full VCC and temperature range. |
| Robust latch-up immunity | >250 mA per JESD17 - Prevents destructive latch-up during transient overvoltage or ground bounce events. |
Applications
| Audio Interface Buffering | SSD Controller Data Bus |
|---|---|
|
Use Scenario: Isolating and driving I²S or SPDIF data lines between a 3.3 V SoC and 5 V DAC or amplifier IC in AV receivers and Blu-ray players. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing voltage translation, fan-out amplification, and bus contention prevention. Use Value: Eliminates need for discrete level shifters while maintaining <4.7 ns propagation delay for jitter-sensitive audio clocks. |
Use Scenario: Buffering command/address lines between a 1.8 V NVMe controller and 3.3 V NAND flash packages in client SSDs. IC Role / Device Role / Timing Role: Quad-channel bus driver with independent OE control enabling precise timing-aligned command gating. Use Value: Delivers 24 mA drive strength at 1.8 V VCC to meet setup/hold timing across 10+ cm PCB traces with minimal skew. |
| Industrial HMI Display Interface | Telecom Power Management Bus |
|
Use Scenario: Driving parallel RGB or LVDS control signals from a 2.5 V FPGA to a 3.3 V display timing controller in ruggedized tablets and video analytics servers. IC Role / Device Role / Timing Role: Voltage-tolerant buffer ensuring signal integrity across mixed-supply domains with –40°C to +125°C operation. Use Value: Maintains 5.5 V input tolerance and 4.7 ns tpd across full temperature range-no derating required for outdoor deployment. |
Use Scenario: Enabling/disabling PMBus or SMBus communication lines between a 3.3 V baseboard management controller (BMC) and multiple 5 V DC-DC modules in telecom AC-DC supplies. IC Role / Device Role / Timing Role: 3-state bus isolator preventing backfeed and contention during hot-plug insertion of power modules. Use Value: Independent OE pins allow per-module bus arbitration; ±2000 V HBM rating ensures reliability in noisy power environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125ADR | Quad buffer with active-high OE (vs. active-low OE on SN74LVC126ADR); identical VCC range, speed, and drive. | Requires inverted OE logic in host firmware or external inverter; unsuitable where OE polarity is fixed by system architecture. | Select SN74LVC125ADR only if existing control logic sources high-active enables; otherwise, SN74LVC126ADR avoids redesign. |
| 74LVC126PW,118 (Nexperia) | Same function and pinout; slightly higher max tpd (5.0 ns @ 3.3 V); identical 5.5 V input tolerance and –40°C to +125°C rating. | Validated for use in European industrial automation designs; differs in MSL rating (Level-1 vs. Level-2 for some variants). | Choose 74LVC126PW,118 for dual-sourcing in EU-based production; verify reflow profile compatibility before substitution. |
Compared with SN74LVC125ADR and 74LVC126PW,118, the SN74LVC126ADR offers optimal fit for systems requiring active-low OE control and TI-qualified SOIC-14 logistics-enabling drop-in replacement where OE polarity and thermal metrics align, but requiring logic inversion or layout review for the alternatives.
Availability
SN74LVC126ADR is available at Aetrix Electronics and suitable for AV receiver signal routing, SSD controller interconnects, industrial HMI displays, and telecom power management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC126ADR 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 connectivity technologies, with decades of experience in high-reliability logic and interface solutions.
The SN74LVC126ADR belongs to TI's LVC (Low-Voltage CMOS) logic family, designed specifically for low-power, mixed-voltage digital interfacing in space-constrained, thermally demanding applications from consumer electronics to industrial infrastructure.
FAQ
What is the recommended pull-down resistor value for OE pins on the SN74LVC126ADR?
The SN74LVC126ADR datasheet specifies that OE must be tied to GND through a pulldown resistor during power-up/down to guarantee high-impedance state. The minimum resistor value depends on the current-sourcing capability of the driver controlling OE; typical values range from 4.7 kΩ to 10 kΩ for standard GPIO drivers. For SN74LVC126ADR, a 10 kΩ resistor ensures reliable low-level assertion without excessive current draw.
Can the SN74LVC126ADR safely interface a 5 V microcontroller with a 1.8 V FPGA?
Yes-the SN74LVC126ADR accepts inputs up to 5.5 V regardless of VCC, making it ideal for down-translation. When powered at 1.8 V, its outputs swing rail-to-rail (0 V to 1.8 V), fully compatible with 1.8 V FPGA inputs. The SN74LVC126ADR maintains specified VOL/VOH and timing across this configuration, confirmed in TI's Electrical Characteristics tables for VCC = 1.8 V.
Does the SN74LVC126ADR require external bypass capacitors, and where should they be placed?
Yes-each VCC pin (Pin 14) of the SN74LVC126ADR requires a 0.1 µF ceramic bypass capacitor connected directly between VCC and GND (Pin 7), placed as close as possible to the SOIC-14 package. This minimizes power rail noise and prevents output instability during fast switching. TI recommends placing the capacitor within 2 mm of the pins and using short, wide traces for lowest inductance.
What is the maximum capacitive load the SN74LVC126ADR can drive while maintaining 4.7 ns propagation delay?
The 4.7 ns maximum tpd for SN74LVC126ADR is characterized with a 50 pF load and 500 Ω termination per TI's Parameter Measurement Information. Under those conditions, the device meets timing across its full operating range. Driving >50 pF increases tpd nonlinearly; for 100 pF loads, measured tpd exceeds 6 ns at 3.3 V. Thus, SN74LVC126ADR is optimized for ≤50 pF loads in high-speed applications.
Is the SN74LVC126ADR pin-compatible with older 74LS126 or 74HC126 devices?
No-while the SN74LVC126ADR shares the same logic function and SOIC-14 footprint as 74LS126 and 74HC126, it is not electrically or thermally pin-compatible. Key differences include 5.5 V-tolerant inputs (vs. 7 V max for HC, 5.25 V for LS), lower VCC range (1.65–3.6 V vs. 4.75–5.25 V for LS), and different DC/AC characteristics. Direct replacement requires validation of voltage levels, timing, and power delivery in the target system.
SN74LVC126ADR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74LVC126ADR FAQ
1.How can I place an order for SN74LVC126ADR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC126ADR 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 SN74LVC126ADR reliable?
The price and inventory of SN74LVC126ADR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC126ADR is usually 5 days.
3.What payment methods are accepted for SN74LVC126ADR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC126ADR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC126ADR?
SN74LVC126ADR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC126ADR 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 SN74LVC126ADR?
For technical support, including SN74LVC126ADR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC126ADR requirements.
6.How does Aetrix verify that SN74LVC126ADR is sourced from the original manufacturer or authorized distributors?
All SN74LVC126ADR 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 SN74LVC126ADR meets industry standards.
7.What is the process for return or replacement of SN74LVC126ADR?
All SN74LVC126ADR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC126ADR, 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 SN74LVC126ADR part is unused and in its original packaging.
Return procedure for SN74LVC126ADR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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