Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

STMicroelectronics 74V2T126STR

Name: 74V2T126STR
Brand: STMicroelectronics
SKU: 74V2T126STR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 74V2T126STR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: SOT-23-8

Datasheet:: 74V2T126STR.pdf

Description:: IC BUF NON-INVERT 5.5V SOT23-8

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,314

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

74V2T126STR from STMicroelectronics is a dual 3-state bus buffer IC designed for voltage-level translation and bidirectional bus isolation in mixed-voltage systems. It features dual independent channels, 3.8 ns typical propagation delay at 5 V, ±8 mA symmetrical output drive, 4.5–5.5 V operating range, and input tolerance up to 7 V-enabling safe interfacing between 3 V and 5 V logic domains in portable battery-powered equipment.

For engineers reviewing the 74V2T126STR datasheet, 74V2T126STR pinout, 74V2T126STR application, or 74V2T126STR equivalent, key selection criteria include 3-state enable timing (tPLZ/tPZL ≤ 7.0 ns), power-down leakage (<5 µA), ESD-protected I/O (±20 mA diode current rating), and SOT23-8L package compatibility with high-density PCB layouts.

Technical Context

This device implements two independent non-inverting buffers, each controlled by a dedicated active-low 3-state enable input (1G, 2G). All inputs and outputs support overvoltage tolerance (0–7 V) regardless of VCC, enabling robust hot-swap and power-down protection without external clamping.

Its C2MOS sub-micron silicon gate process delivers balanced tPLH ≈ tPHL propagation delays and symmetrical |IOH| = IOL ≥ 8 mA drive strength under 5 V supply, while maintaining ICC ≤ 1 µA quiescent current-critical for low-power portable system design.

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation Delay (tPD)	3.8 ns typical at VCC = 5 V, CL = 15 pF - enables >100 MHz bus operation with tight timing margins
Supply Voltage Range	4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS rails and regulated 5 V supplies
Output Drive Strength	±8 mA minimum - sufficient to drive 50 Ω transmission lines or multiple CMOS loads
Input Voltage Tolerance	−0.5 V to +7.0 V - supports 3 V logic inputs and hot-plug resilience without level shifters
Quiescent Supply Current	1 µA max at TA = 25°C - minimizes standby power in battery-operated PDA/camcorder systems
ESD Protection	Human Body Model ≥ 2 kV - built-in protection eliminates need for external TVS on I/O lines
Operating Temperature	−55°C to +125°C - qualified for extended industrial and automotive under-hood environments

Pinout & Package

SOT23-8L surface-mount package: 1.45 mm height, 3.00 mm × 3.00 mm body, 0.65 mm pitch, 8-pin lead frame with exposed pad not present. RoHS-compliant, halogen-free, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1, 7	1G, 2G - Active-Low Output Enable	Drives respective output (1Y, 2Y) into high-impedance state when HIGH; enables buffer when LOW
2, 5	1A, 2A - Data Inputs	Accept 0–7 V logic signals independent of VCC; internally clamped with ESD diodes
3, 6	2Y, 1Y - Data Outputs	3-state CMOS outputs with symmetrical sourcing/sinking capability and overvoltage-safe structure
4	GND	Reference ground terminal; must be connected before VCC during power sequencing
8	VCC	Positive supply input; decoupling capacitor (100 nF) required within 5 mm of pin

Key Features

Feature	Design Value
Dual independent 3-state buffers	Enables isolated control of two data paths (e.g., bidirectional I²C pull-up switching or memory address/data gating)
Input overvoltage tolerance (0–7 V)	Eliminates external level translators when interfacing 3 V microcontrollers to 5 V peripherals
Power-down protection on all I/O	Prevents back-driving and latch-up during VCC ramp-up/down or system sleep modes
Balanced tPLH/tPHL propagation	Reduces duty cycle distortion in clock distribution or synchronous data transfer paths
Low ICC = 1 µA (max)	Extends battery life in always-on subsystems such as real-time clock backup domains or sensor wake-up logic

Applications

Portable Consumer Electronics

Industrial Control Interfaces

Use Scenario: Signal isolation between 3.3 V ARM core and 5 V display interface in a handheld PDA.

IC Role / Device Role / Timing Role: Dual bus buffer providing level-shifted, direction-controlled data path with <7 ns enable/disable timing.

Use Value: Prevents cross-rail contention and enables seamless power sequencing during deep-sleep wake-up cycles.

Use Scenario: Isolating PLC I/O module address/data buses during firmware update or hot-swap insertion.

IC Role / Device Role / Timing Role: 3-state buffer enabling clean bus release prior to reconfiguration, with 7 V-tolerant inputs surviving field transients.

Use Value: Eliminates bus contention faults and reduces need for external transient suppressors on modular backplanes.

Automotive Infotainment

Medical Diagnostic Equipment

Use Scenario: Level translation between 3.3 V SoC and legacy 5 V audio codec in vehicle head unit.

IC Role / Device Role / Timing Role: Non-inverting buffer with ESD-hardened I/O meeting AEC-Q100 Grade 1 requirements.

Use Value: Ensures signal integrity across temperature extremes (−40°C to +125°C) without derating.

Use Scenario: Enabling/disabling analog front-end sensor channels during calibration sequences in portable ultrasound devices.

IC Role / Device Role / Timing Role: Low-leakage (≤5 µA) 3-state switch controlling analog multiplexer enable lines.

Use Value: Maintains ultra-low standby current in battery-powered diagnostic tools with multi-hour runtime.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC2T45DCUR	Supports dual-supply translation (1.65–5.5 V on A/B sides); higher ICC (10 µA typ); 3.3 ns tPD	Required when bidirectional level shifting (3.3 V ↔ 5 V) is needed instead of unidirectional buffering	Select if true bidirectional voltage translation is mandatory; otherwise 74V2T126STR offers lower leakage and simpler enable control
74LCX245MTCX	Octal (not dual) 3-state transceiver; 3.5 ns tPD; 2.0–3.6 V VCC range only; no 7 V input tolerance	Used where higher channel count and lower supply voltage are prioritized over overvoltage safety	Choose only for space-constrained 8-bit bus applications; unsuitable for 5 V systems requiring 7 V-tolerant I/O

Compared with SN74LVC2T45DCUR and 74LCX245MTCX, the 74V2T126STR uniquely combines 7 V input tolerance, 1 µA quiescent current, and SOT23-8L footprint-making it optimal for low-power, mixed-voltage, single-supply portable designs where robustness trumps channel density.

Availability

74V2T126STR is available at Aetrix Electronics and suitable for portable consumer electronics, industrial control interfaces, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 74V2T126STR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering innovative solutions across automotive, industrial, power, and smart mobility markets.

The 74V2T126STR belongs to ST's high-speed CMOS logic family, engineered specifically for low-power, mixed-voltage interface applications in battery-operated and thermally constrained systems.

FAQ

Can the 74V2T126STR operate with a 3.3 V supply?

No. The 74V2T126STR is specified only for 4.5–5.5 V operation per its Recommended Operating Conditions table. Its VIH/VIL thresholds (2.0 V/0.8 V) and output drive (≥3.94 V VOH at −8 mA) require 5 V rail compliance. Using 3.3 V risks undefined logic states and insufficient noise margin.

What is the maximum capacitive load this device can drive reliably?

The AC Electrical Characteristics specify performance up to 50 pF load capacitance with guaranteed tPLH/tPHL ≤ 6.5 ns and tPZL/tPLZ ≤ 8.0 ns at VCC = 5.0 V. Driving >50 pF may increase propagation delay nonlinearly and degrade edge rate; layout parasitics should be minimized to stay within this limit.

Does the 74V2T126STR support hot-swap insertion?

Yes. Its input and output pins tolerate −0.5 V to +7.0 V independent of VCC, and power-down protection prevents back-current flow when VCC is absent or ramping. This allows safe insertion into live 5 V backplanes, provided GND is mated first and VCC last per mechanical sequencing guidelines.

How does the 74V2T126STR differ from standard 74HC126?

Unlike 74HC126, the 74V2T126STR uses C2MOS technology for 3.8 ns tPD (vs. ~15 ns), achieves 1 µA ICC (vs. ~4 µA), supports 7 V input tolerance (vs. VCC+0.5 V), and is qualified for −55°C to +125°C operation (vs. −40°C to +85°C), making it superior for high-speed, low-power, extended-temperature applications.

74V2T126STR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74V

Package/Case:: SOT-23-8

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 1

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 8mA, 8mA

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-8

74V2T126STR FAQ

1.How can I place an order for 74V2T126STR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74V2T126STR 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 74V2T126STR reliable?

The price and inventory of 74V2T126STR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74V2T126STR is usually 5 days.

3.What payment methods are accepted for 74V2T126STR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74V2T126STR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74V2T126STR?

74V2T126STR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74V2T126STR 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 74V2T126STR?

For technical support, including 74V2T126STR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74V2T126STR requirements.

6.How does Aetrix verify that 74V2T126STR is sourced from the original manufacturer or authorized distributors?

All 74V2T126STR 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 74V2T126STR meets industry standards.

7.What is the process for return or replacement of 74V2T126STR?

All 74V2T126STR units undergo pre-shipment inspection (PSI). If there is an issue with 74V2T126STR, 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 74V2T126STR part is unused and in its original packaging.

Return procedure for 74V2T126STR:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…