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

STMicroelectronics 74LVX126TTR

Name: 74LVX126TTR
Brand: STMicroelectronics
SKU: 74LVX126TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVX126TTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: 74LVX126TTR.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74LVX126TTR from STMicroelectronics is a low-voltage CMOS quad 3-state bus buffer with 5V-tolerant inputs, operating from 2V to 3.6V supply, delivering 4.4ns typical propagation delay at 3.3V, ±4mA symmetrical output drive, and 2µA max quiescent current - used for voltage-level translation and bidirectional bus isolation in portable 3.3V systems.

For engineers reviewing the 74LVX126TTR datasheet, 74LVX126TTR pinout, 74LVX126TTR application, or 74LVX126TTR equivalent, key selection criteria include 5V input tolerance, 3-state enable timing (tPZL/tPLZ ≤ 13.0ns), low-noise VOLP = 0.3V (typ.), and TSSOP-14 package compatibility with legacy 74-series footprint.

Technical Context

The device implements four independent non-inverting buffers, each with active-low 3-state enable (G) controlling output impedance. Inputs accept 0–7V regardless of VCC, enabling robust 5V-to-3.3V interfacing without external level shifters.

All I/O pins feature ESD protection (2kV HBM), latch-up immunity >200mA, and power-down protection that prevents back-driving during VCC=0. Propagation delays tPLH and tPHL are balanced (≤0.5ns skew), supporting clean signal integrity in synchronous data buses.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Operating Range	2.0V to 3.6V - supports battery-powered 3.3V systems with 1.2V data retention during sleep
t_PD Propagation Delay	4.4ns (typ.) at V_CC=3.3V, CL=15pF - enables ≥100MHz bus operation in low-power domains
I_OH/I_OL Drive Strength	±4mA (min) at V_CC=3V - sufficient to drive 50pF loads across PCB traces without added buffering
V_IL/V_IH Input Thresholds	0.8V / 2.0V at V_CC=3V - ensures reliable TTL- and 5V-CMOS-compatible logic recognition
V_OHP/V_OLP Noise Margin	0.3V (typ.) dynamic low-voltage quiet output - reduces crosstalk in dense routing environments
I_CC Quiescent Current	2µA (max) at T_A=25°C - extends runtime in always-on sensor interface or standby subsystems
Input Voltage Range	0V to 7V - allows hot-plug and mixed-voltage board design without sequencing constraints

Pinout & Package

TSSOP-14 package: 4.4mm × 5.0mm body, 0.65mm pitch, 1.2mm max height, lead-free and RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	G1–G4 (Active-Low Enable)	Controls high-impedance state per buffer; driven low to enable output, high to disable
2, 5, 9, 12	A1–A4 (Data Inputs)	5V-tolerant inputs accepting 0–7V; no clamping diodes required for 5V logic sources
3, 6, 8, 11	Y1–Y4 (Data Outputs)	CMOS outputs with symmetrical drive; tri-stated when corresponding G is high
7	GND	Digital ground reference; decoupling capacitor must be placed adjacent to pin
14	V_CC	Primary supply (2–3.6V); separate from input voltage domain due to internal level-shifting

Key Features

Feature	Design Value
5V-tolerant inputs	Accepts 0–7V on all A-inputs independent of V_CC, eliminating external level translators in mixed-voltage designs
Power-down protection	Prevents current backflow into V_CC when supply is off, enabling safe hot-swap and partial-power-down modes
Balanced propagation delays	t_PLH ≅ t_PHL (≤0.5ns skew) ensures minimal duty-cycle distortion in clock distribution paths
Low-noise output switching	V_OLP = 0.3V (typ.) at V_CC=3.3V reduces simultaneous switching noise in multi-buffer configurations
ESD and latch-up immunity	2kV HBM ESD rating and improved latch-up immunity (>200mA) support industrial and automotive-adjacent environments

Applications

Portable Data Acquisition

Industrial PLC Backplane Interface

Use Scenario: Isolating ADC/DAC control lines between 5V microcontroller and 3.3V precision analog front-end.

IC Role / Device Role / Timing Role: Level-translating 3-state buffer enabling bidirectional command/data flow while preventing supply contention.

Use Value: Eliminates discrete resistor-divider networks and reduces BOM count by integrating 5V-tolerant inputs and low-I_CC sleep mode.

Use Scenario: Buffering address/data bus signals between 5V CPU module and 3.3V I/O expansion cards in modular PLC chassis.

IC Role / Device Role / Timing Role: Quad bus driver with synchronized enable control, ensuring glitch-free bus arbitration during hot-insertion events.

Use Value: Enables deterministic t_PZL/t_PLZ ≤13.0ns timing for real-time I/O scanning cycles without added timing margin.

Wearable Sensor Hub

Automotive Body Control Module (BCM) Subsystem

Use Scenario: Interfacing 5V legacy sensors (e.g., Hall-effect switches) to ultra-low-power 3.3V ARM Cortex-M0+ MCU.

IC Role / Device Role / Timing Role: Low-quiescent-current (2µA max) buffer enabling always-on sensor wake-up detection without battery drain.

Use Value: Extends coin-cell battery life beyond 12 months via sub-µA standby current and 1.2V data retention capability.

Use Scenario: Isolating LIN transceiver control lines from 3.3V microcontroller in 12V vehicle electrical environment.

IC Role / Device Role / Timing Role: Robust input protection (0–7V tolerance, 2kV ESD) handling load-dump transients and battery-reverse conditions.

Use Value: Reduces need for external TVS diodes and series resistors, lowering layout area and improving EMC performance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC126APWR	Lower V_CC min (1.65V), higher I_OL (24mA), but only 3.6V input tolerant - not 5V-tolerant	Requires external level-shifting for 5V inputs; unsuitable for direct 5V-to-3.3V interface	Select only if system uses ≤3.6V logic throughout and requires stronger drive
74LCX126MTCX	Same 5V input tolerance, but higher ICC (10µA typ.), wider V_CC range (2–3.6V), and slower t_PD (5.5ns typ.)	Acceptable where lower cost is prioritized over propagation delay and quiescent current	Prefer when BOM cost sensitivity outweighs timing or power constraints

Compared with SN74LVC126APWR and 74LCX126MTCX, the 74LVX126TTR uniquely combines true 5V input tolerance, sub-5ns speed, and <2µA quiescent current - making it optimal for battery-constrained, mixed-voltage embedded interfaces requiring zero external components.

Availability

74LVX126TTR is available at Aetrix Electronics and suitable for portable data acquisition, industrial PLC backplane interface, and wearable sensor hub designs requiring stable component supply and long-term lifecycle support.

Supply support for 74LVX126TTR 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The 74LVX logic family targets low-voltage, low-power 3.3V systems requiring interoperability with legacy 5V logic - emphasizing voltage translation, noise immunity, and battery longevity.

FAQ

Can 74LVX126TTR operate with V_CC = 1.8V?

No. The absolute minimum recommended V_CC is 2.0V per Table 5. At 1.8V, VIH/VIL thresholds are not guaranteed, and output drive falls below specification. Operation below 2.0V may result in undefined logic states or excessive propagation delay.

Is the TSSOP-14 package pin-compatible with SO-14?

No. While both packages contain 14 pins and share identical pin numbering and function mapping, TSSOP-14 has 0.65mm pitch and 4.4mm × 5.0mm body, whereas SO-14 uses 1.27mm pitch and 8.75mm × 4.0mm body - requiring different PCB footprints and reflow profiles.

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

The datasheet specifies AC characteristics up to 50pF (Table 8). Driving >50pF increases propagation delay nonlinearly and may exceed VOLP/VOLV noise limits. For >50pF loads, add series termination or use a buffer with higher I_OL/I_OH.

Does the 74LVX126TTR require external pull-up or pull-down resistors on enable inputs?

No. Internal weak pull-downs are not present. G inputs are CMOS and must be actively driven to defined logic levels; floating G pins cause indeterminate output states. External resistors are only needed if system-level default state must be enforced during power-up or reset.

74LVX126TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74LVX

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

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:: 4mA, 4mA

Voltage - Supply:: 2V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TSSOP

74LVX126TTR FAQ

1.How can I place an order for 74LVX126TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVX126TTR 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 74LVX126TTR reliable?

The price and inventory of 74LVX126TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVX126TTR is usually 5 days.

3.What payment methods are accepted for 74LVX126TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVX126TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LVX126TTR?

74LVX126TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVX126TTR 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 74LVX126TTR?

For technical support, including 74LVX126TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVX126TTR requirements.

6.How does Aetrix verify that 74LVX126TTR is sourced from the original manufacturer or authorized distributors?

All 74LVX126TTR 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 74LVX126TTR meets industry standards.

7.What is the process for return or replacement of 74LVX126TTR?

All 74LVX126TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVX126TTR, 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 74LVX126TTR part is unused and in its original packaging.

Return procedure for 74LVX126TTR:

1.Submit a request within 90 days.

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

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