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Texas Instruments SN74ALVC126D

Name: SN74ALVC126D
Brand: Texas Instruments
SKU: SN74ALVC126D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ALVC126D

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: SN74ALVC126D.pdf

Description:: IC BUF NON-INVERT 3.6V 14SOIC

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Product details

Overview

SN74ALVC126D from Texas Instruments is a quadruple bus buffer gate with 3-state outputs, designed for 1.65-V to 3.6-V V_CC operation. It features four independent line drivers, ±24-mA output drive at 3.3 V, 3.1-ns max propagation delay, and latch-up performance exceeding 250 mA per JESD 17 - used in level-shifting data buses between mixed-voltage logic domains in industrial control interfaces.

For engineers reviewing the SN74ALVC126D datasheet, SN74ALVC126D pinout, SN74ALVC126D application, or SN74ALVC126D equivalent, key selection criteria include 3-state enable timing (t_en/t_dis ≤ 3.8 ns), rail-to-rail input compatibility across 1.65–3.6 V, and SOIC-14 package thermal resistance (θ_JA = 86 °C/W) for thermally constrained PCB layouts.

Technical Context

This device implements four identical non-inverting buffers, each with an active-high output-enable (OE) control. Each channel operates independently: when OE is high, Y follows A; when OE is low, Y enters high-impedance state. No internal bus-hold or series termination is integrated.

Input thresholds scale with V_CC: V_IH = 0.65×V_CC (1.65–1.95 V), 1.7 V (2.3–2.7 V), or 2.0 V (2.7–3.6 V); V_IL = 0.35×V_CC, 0.7 V, or 0.8 V respectively. Output drive strength is specified at ±24 mA under 3.0-V V_CC, with VOL ≤ 0.55 V and VOH ≥ 2.0 V at that condition.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65 V to 3.6 V - supports interoperability between 1.8-V, 2.5-V, and 3.3-V logic domains without level translators.
Max t_pd	3.1 ns at 3.3 V - enables reliable operation in high-speed digital control paths up to ~150 MHz clock-equivalent rates.
Output Drive	±24 mA at 3.0 V - drives standard 50-Ω transmission lines or loads up to 10 CMOS inputs with full voltage swing.
I_OFF (I_OZ)	±10 µA at 3.6 V - ensures minimal leakage current in 3-state mode, critical for low-power standby states.
Latch-Up Immunity	>250 mA per JESD 17 - withstands transient overcurrent events in noisy industrial environments without destructive failure.
ESD Rating	2000-V HBM, 200-V MM, 1000-V CDM - meets IEC 61000-4-2 system-level ESD robustness requirements for board-level integration.
Power Dissipation (C_pd)	19 pF per gate at 3.3 V - determines dynamic power consumption (P = C_pd × V² × f) for thermal budgeting in dense logic arrays.

Pinout & Package

SN74ALVC126D is housed in a 14-pin SOIC (D) package, 8.75 mm × 3.91 mm body size, 1.75 mm max height, with 1.27-mm lead pitch and gull-wing leads. Thermal resistance θ_JA = 86 °C/W.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	Output Enable (OE)	Active-high control per channel; tie low via pulldown resistor during power-up to guarantee high-Z state before initialization.
2, 5, 11, 14	Data Input (A)	Non-inverting input for corresponding buffer; accepts 1.65–3.6 V logic levels regardless of V_CC.
3, 6, 12, 9	Output (Y)	3-state buffered output; high-Z when OE = low; full-rail swing when enabled and loaded ≤24 mA.
7	GND	Ground reference for all I/O and internal circuitry; requires low-inductance connection to minimize ground bounce.
14	V_CC	Single supply pin for entire device; bypass with 0.1-µF ceramic capacitor placed within 5 mm of pin.

Key Features

Feature	Design Value
Rail-to-rail input voltage range	Supports VI from 0 V to V_CC (up to 3.6 V), enabling direct interface with legacy 5-V-tolerant microcontrollers without external clamping.
Independent 3-state control per channel	Allows selective isolation of individual data lines in multi-drop bus architectures without affecting other channels.
Low dynamic power consumption	C_pd = 19 pF at 3.3 V enables sub-mW switching power at 10-MHz toggle rate - suitable for battery-backed control modules.
Guaranteed high-impedance on power-up	OE pins default inactive (low) when un-driven; pulldown resistor ensures safe start-up behavior in hot-swap systems.
JEDEC-standard SOIC footprint	Compatible with industry-standard reflow profiles (MSL Level-1, 260°C peak) and automated optical inspection (AOI) tooling.

Applications

Industrial PLC Backplane Interface	Automotive Body Control Module
Use Scenario: Isolating sensor data lanes between 3.3-V MCU and 2.5-V ADC subsystems in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Bidirectional bus buffer with per-lane 3-state control, enabling time-multiplexed access to shared memory-mapped peripherals. Use Value: Eliminates need for discrete level shifters while maintaining <3.1-ns propagation delay - preserves timing margins in deterministic real-time I/O cycles.	Use Scenario: Driving LIN transceiver enable lines and multiplexing diagnostic signals between 1.8-V SoC and 3.3-V CAN PHY in body control units. IC Role / Device Role / Timing Role: Voltage-translating buffer with independent OE controls, synchronizing signal activation across mixed-voltage domains. Use Value: ±24-mA drive capability directly sources LIN pull-up resistors (typically 30 kΩ), reducing BOM count and PCB area versus discrete FET solutions.
Medical Patient Monitor Data Bus	Test Equipment Signal Routing
Use Scenario: Buffering ECG waveform digitizer outputs to FPGA-based processing engine while isolating noise-sensitive analog front-end stages. IC Role / Device Role / Timing Role: Low-noise, high-Z isolation gate preventing digital switching noise from coupling into analog signal paths. Use Value: 2000-V HBM ESD rating protects against operator-handling discharge events during field service - critical for Class II medical device compliance.	Use Scenario: Configurable signal routing matrix in automated test equipment, where multiple DUT interfaces share common measurement resources. IC Role / Device Role / Timing Role: Reconfigurable bus switch enabling dynamic path selection via FPGA-controlled OE lines. Use Value: Independent per-channel OE allows glitch-free signal path reconfiguration without bus contention - essential for zero-downtime test sequence transitions.

Industrial PLC Backplane Interface

Automotive Body Control Module

Use Scenario: Isolating sensor data lanes between 3.3-V MCU and 2.5-V ADC subsystems in programmable logic controller backplanes.

IC Role / Device Role / Timing Role: Bidirectional bus buffer with per-lane 3-state control, enabling time-multiplexed access to shared memory-mapped peripherals.

Use Value: Eliminates need for discrete level shifters while maintaining <3.1-ns propagation delay - preserves timing margins in deterministic real-time I/O cycles.

Use Scenario: Driving LIN transceiver enable lines and multiplexing diagnostic signals between 1.8-V SoC and 3.3-V CAN PHY in body control units.

IC Role / Device Role / Timing Role: Voltage-translating buffer with independent OE controls, synchronizing signal activation across mixed-voltage domains.

Use Value: ±24-mA drive capability directly sources LIN pull-up resistors (typically 30 kΩ), reducing BOM count and PCB area versus discrete FET solutions.

Medical Patient Monitor Data Bus

Test Equipment Signal Routing

Use Scenario: Buffering ECG waveform digitizer outputs to FPGA-based processing engine while isolating noise-sensitive analog front-end stages.

IC Role / Device Role / Timing Role: Low-noise, high-Z isolation gate preventing digital switching noise from coupling into analog signal paths.

Use Value: 2000-V HBM ESD rating protects against operator-handling discharge events during field service - critical for Class II medical device compliance.

Use Scenario: Configurable signal routing matrix in automated test equipment, where multiple DUT interfaces share common measurement resources.

IC Role / Device Role / Timing Role: Reconfigurable bus switch enabling dynamic path selection via FPGA-controlled OE lines.

Use Value: Independent per-channel OE allows glitch-free signal path reconfiguration without bus contention - essential for zero-downtime test sequence transitions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC126A	Same pinout, identical function, but rated only to 3.6 V V_CC; lacks 1.65-V minimum support and has higher t_pd (3.7 ns @ 3.3 V).	Suitable for 3.3-V-only systems; not recommended for 1.8-V domain bridging or ultra-low-voltage operation.	Select SN74LVC126A only if operating exclusively at ≥2.3 V and cost sensitivity outweighs 0.6-ns timing margin.
74AVC126	Pin-compatible, same 14-pin SOIC; supports 1.2–3.6 V range but specifies lower drive (±12 mA @ 1.8 V) and higher ICC (20 µA typical).	Better for ultra-low-voltage (1.2–1.5 V) applications; less suitable for driving heavy capacitive loads or long traces at 3.3 V.	Choose 74AVC126 when interfacing with sub-1.8-V logic families; avoid when >12-mA sink/source is required at 3.3 V.

Compared with SN74LVC126A and 74AVC126, the SN74ALVC126D uniquely delivers guaranteed 1.65-V operation with 24-mA drive and 3.1-ns speed - making it the optimal choice for mixed-voltage industrial and automotive bus isolation where both low-voltage compatibility and high-drive strength are simultaneously required.

Availability

SN74ALVC126D is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, automotive body control modules, and medical patient monitor data buses requiring stable component supply and long-term production continuity.

Supply support for SN74ALVC126D 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The SN74ALVC126D belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered for high-speed, low-power, mixed-voltage interoperability in space-constrained industrial control and automotive subsystems.

FAQ

What is the minimum V_CC required for guaranteed operation of the SN74ALVC126D?

The SN74ALVC126D is fully specified from 1.65 V to 3.6 V. At 1.65 V, it guarantees V_IH = 1.07 V, V_IL = 0.58 V, t_pd ≤ 5.6 ns, and ±4-mA output drive. Operation below 1.65 V is not characterized and may result in undefined logic states or timing violations - always maintain V_CC ≥ 1.65 V for compliant use of the SN74ALVC126D.

Can the SN74ALVC126D be used to translate between 5-V and 3.3-V logic levels?

No - the SN74ALVC126D is not 5-V tolerant. Its absolute maximum input voltage is 4.6 V, and recommended VI range is 0 to V_CC. Applying 5-V signals risks permanent damage. For 5-V to 3.3-V translation, use TI's SN74LVC4245A or similar dual-supply translators. The SN74ALVC126D is intended strictly for 1.65–3.6 V domain bridging.

How should unused inputs be handled on the SN74ALVC126D?

All unused inputs - including A and OE pins - must be tied to either V_CC or GND. Floating inputs cause increased ICC, erratic output behavior, and potential ESD susceptibility. TI recommends connecting unused OE pins to GND (to disable outputs) and unused A inputs to GND or V_CC based on desired default state - this ensures predictable operation and avoids violating the "Implications of Slow or Floating CMOS Inputs" guideline referenced in the SN74ALVC126D datasheet.

Does the SN74ALVC126D support hot-swap or live-insertion applications?

The SN74ALVC126D supports controlled hot-swap operation when OE pins are externally pulled low during insertion. Its I_OFF leakage of ±10 µA at 3.6 V minimizes pre-charge current, and the guaranteed high-impedance state on power-up (with proper pulldown) prevents bus contention. However, it lacks built-in current limiting or slew-rate control - external series resistors or dedicated hot-swap controllers are recommended for systems requiring strict inrush current management alongside the SN74ALVC126D.

What is the thermal performance of the SN74ALVC126D in its SOIC package?

The SN74ALVC126D in SOIC (D) package has a junction-to-ambient thermal resistance (θ_JA) of 86 °C/W under standard JEDEC 2S2P board conditions. At 25°C ambient and 10-mA average output current per channel, power dissipation remains below 15 mW - resulting in negligible temperature rise. For continuous 24-mA drive on all four channels, derate ambient temperature by ~10°C or add local copper pour to maintain T_J < 125°C in the SN74ALVC126D.

SN74ALVC126D Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ALVC

Package/Case:: 14-SOIC (0.154", 3.90mm 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:: 24mA, 24mA

Voltage - Supply:: 1.65V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

SN74ALVC126D FAQ

1.How can I place an order for SN74ALVC126D through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ALVC126D 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 SN74ALVC126D reliable?

The price and inventory of SN74ALVC126D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC126D is usually 5 days.

3.What payment methods are accepted for SN74ALVC126D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVC126D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74ALVC126D?

SN74ALVC126D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ALVC126D 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 SN74ALVC126D?

For technical support, including SN74ALVC126D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC126D requirements.

6.How does Aetrix verify that SN74ALVC126D is sourced from the original manufacturer or authorized distributors?

All SN74ALVC126D 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 SN74ALVC126D meets industry standards.

7.What is the process for return or replacement of SN74ALVC126D?

All SN74ALVC126D units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC126D, 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 SN74ALVC126D part is unused and in its original packaging.

Return procedure for SN74ALVC126D:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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