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 > Translators, Level Shifters

STMicroelectronics 74LVX4245TTR

Name: 74LVX4245TTR
Brand: STMicroelectronics
SKU: 74LVX4245TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 74LVX4245TTR

Manufacturer:: STMicroelectronics

Category:: Translators, Level Shifters

Package:

Datasheet:: 74LVX4245TTR.pdf

Description:: IC TXRX NON-INVERT 5.5V 24TSSOP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,932

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

Product details

Overview

74LVX4245TTR from STMicroelectronics is an octal dual-supply bus transceiver enabling bidirectional level translation between 5V (A-port) and 3.3V (B-port) buses. It features 8.5 ns max propagation delay at VCCA=5.0V/VCCB=3.3V, ±24 mA symmetrical drive strength, 5 µA max quiescent current, and pin/function compatibility with standard 74-series 4245. It is used in mixed-voltage motherboard interconnects and FPGA-to-ASIC data bridges.

For engineers reviewing the 74LVX4245TTR datasheet, 74LVX4245TTR pinout, 74LVX4245TTR application, or 74LVX4245TTR equivalent, key selection criteria include dual-rail voltage tolerance (4.5–5.5V / 2.7–3.6V), direction-controlled data flow, high-impedance isolation via G input, and ESD-hardened I/O (2 kV HBM).

Technical Context

The device implements a CMOS-based bidirectional bus interface with independent A- and B-side supply rails, allowing asynchronous data transfer in either direction controlled by the DIR signal. Its internal logic ensures simultaneous enable/disable of all eight channels via the active-low G input, with guaranteed high-impedance state when disabled.

It uses sub-micron C2MOS technology to achieve balanced tPLH/tPHL propagation delays and low dynamic noise (VOLP = 0.3 V typ). Input thresholds are referenced to respective VCC rails, and all I/O pins include diode-based ESD protection compliant with 2 kV HBM.

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation Delay (tPD)	8.5 ns max at VCCA=5.0V/VCCB=3.3V - enables ≤118 MHz data throughput in synchronous systems
Supply Voltage Range	VCCA: 4.5–5.5V; VCCB: 2.7–3.6V - supports legacy 5V logic interfacing with modern 3.3V microcontrollers
Output Drive Strength	\|IOH\| = \|IOL\| = 24 mA min - drives standard TTL loads and short PCB traces without external buffers
Quiescent Current	ICCA = ICCB = 5 µA max at TA=25°C - suitable for low-power standby modes in battery-backed systems
ESD Immunity	2 kV HBM on all I/O - eliminates need for external TVS diodes in industrial control backplanes
Dynamic Noise (VOLP)	0.3 V typ at VCCA=5.5V/VCCB=3.3V - reduces crosstalk in dense routing environments
Input Thresholds	VIHA/VILB = 2.0/0.8 V min/max - ensures robust logic recognition across full temperature range (−55°C to +125°C)

Pinout & Package

TSSOP-24 package: 7.7–7.9 mm × 6.25–6.5 mm body, 0.65 mm pitch, 1.1 mm height, lead-free and RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 24	VCCA / VCCB	Independent power supplies for A-side (5V domain) and B-side (3.3V domain)
2	DIR	Direction control: LOW = A→B; HIGH = B→A - determines data flow path synchronously
3–10	A1–A8	Bidirectional I/O for 5V bus - high-impedance when G=HIGH or DIR conflicts with direction
14–21	B1–B8	Bidirectional I/O for 3.3V bus - electrically isolated from A-side except during active transfer
22	G	Active-low output enable - disables both ports to high-impedance, isolating buses completely
11–13	GND	Dedicated ground returns for noise separation - must be connected to system common ground
23	NC	No-connect terminal - left unconnected per design; no internal connection or function

Key Features

Feature	Design Value
Dual-rail level translation	Supports simultaneous 5V ↔ 3.3V bidirectional communication without external resistors or translators
Symmetrical output drive	24 mA sink/source capability on both A and B ports - eliminates skew-induced timing violations
Low-noise switching	0.3 V typical quiet-output noise - maintains signal integrity in mixed-signal PCB layouts
High-impedance isolation	Guaranteed Z-state on all I/O when G=HIGH - prevents bus contention during power sequencing
Enhanced latch-up immunity	Qualified per JEDEC JESD78 - withstands >100 mA injected current without destructive latch-up

Applications

Industrial PLC Backplane

FPGA-to-Microcontroller Interface

Use Scenario: Interfacing legacy 5V I/O modules with a 3.3V FPGA-based controller in programmable logic controllers.

IC Role / Device Role / Timing Role: Bidirectional voltage-level translator managing real-time I/O status updates and command writes across supply domains.

Use Value: Eliminates need for discrete resistor-divider networks or separate unidirectional translators, reducing BOM count and layout area by 60%.

Use Scenario: Connecting a Xilinx Artix-7 FPGA (3.3V I/O) to an ARM Cortex-M7 MCU (5V-tolerant peripherals but 3.3V core).

IC Role / Device Role / Timing Role: Synchronous data bridge enabling burst-mode register access and DMA transfers between heterogeneous processors.

Use Value: 8.5 ns max delay ensures setup/hold timing margins remain intact at 80 MHz peripheral clock rates.

Automotive Body Control Module

Test Equipment Data Bus

Use Scenario: Isolating 5V sensor signal conditioning circuitry from a 3.3V CAN microcontroller subsystem in body electronics.

IC Role / Device Role / Timing Role: Direction-controlled bus isolator preventing ground-loop currents while supporting diagnostic read/write cycles.

Use Value: 2 kV HBM ESD rating meets ISO 10605 requirements without added protection components.

Use Scenario: Adapting legacy 5V GPIB or parallel port test instruments to modern 3.3V digital pattern generators.

IC Role / Device Role / Timing Role: Reconfigurable bus transceiver enabling firmware-switched data direction for stimulus/response protocols.

Use Value: DIR and G inputs allow runtime reconfiguration - supports both talker/listener roles in IEEE 488.2 compliance testing.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal dual-supply bus transceiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC4245APWR	Lower VCCB min (1.65V), higher max speed (tPD = 6.1 ns), but only rated to 85°C ambient	Preferred for commercial-grade 1.8V/3.3V↔5V interfaces; not qualified for extended temperature automotive use	Select when operating temperature ≤85°C and 1.8V B-side support is required
74ALVC164245PAG	16-bit version in TSSOP-48; identical VCC ranges and timing, but double channel count and higher ICC	Used where full 16-bit data bus bridging is needed - requires PCB redesign and larger footprint	Select only when 16-bit width justifies increased cost and board space

Compared with SN74LVC4245APWR and 74ALVC164245PAG, the 74LVX4245TTR offers superior extended-temperature operation (−55°C to +125°C), proven latch-up immunity, and optimal fit for space-constrained 8-bit mixed-voltage interconnects without over-specifying channel count or speed.

Availability

74LVX4245TTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and FPGA-to-MCU interfaces requiring stable component supply across extended temperature and long production lifecycles.

Supply support for 74LVX4245TTR 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad analog/mixed-signal portfolio.

The LVX logic family targets low-voltage, high-speed, mixed-supply applications - designed specifically for reliable 3.3V/5V interoperability in harsh-environment embedded systems.

FAQ

Can 74LVX4245TTR operate with VCCA = 5.5V and VCCB = 2.7V simultaneously?

Yes. The device is fully specified for concurrent operation across its entire recommended range: VCCA = 4.5–5.5V and VCCB = 2.7–3.6V. DC and AC parameters-including propagation delay, drive strength, and noise-remain guaranteed under these conditions per STMicroelectronics datasheet Rev 11, pages 3–6.

What happens to the outputs when G = HIGH and DIR is toggled?

When G = HIGH, all A1–A8 and B1–B8 pins enter high-impedance (Z) state regardless of DIR state. Toggling DIR has no effect on output levels or bus loading until G is asserted LOW, at which point direction control resumes immediately.

Is the NC pin (pin 23) safe to connect to ground or leave floating?

Pin 23 is internally unconnected and must remain unconnected - neither grounded nor tied to any voltage. STMicroelectronics explicitly states it has no internal bond wire or circuit node; grounding it may cause unpredictable leakage or violate mechanical clearance rules in TSSOP packaging.

Does 74LVX4245TTR support hot-swap or live-insertion?

No. The device lacks powered-off protection or bus-hold circuitry. Applying signals to A/B ports while either VCCA or VCCB is at 0V risks violating absolute maximum ratings (e.g., VI/OA > VCCA + 0.5V), potentially damaging I/O structures. Power sequencing per datasheet page 2 is mandatory.

74LVX4245TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74LVX

Package/Case:

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Translator Type:: -

Channel Type:: -

Number of Circuits:: -

Channels per Circuit:: -

Voltage - VCCA:: -

Voltage - VCCB:: -

Input Signal:: -

Output Signal:: -

Output Type:: 3-State

Data Rate:: -

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

Grade:: -

Qualification:: -

Features:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-TSSOP (0.173", 4.40mm Width)

74LVX4245TTR FAQ

1.How can I place an order for 74LVX4245TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVX4245TTR 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 74LVX4245TTR reliable?

The price and inventory of 74LVX4245TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVX4245TTR is usually 5 days.

3.What payment methods are accepted for 74LVX4245TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVX4245TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LVX4245TTR?

74LVX4245TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVX4245TTR 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 74LVX4245TTR?

For technical support, including 74LVX4245TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVX4245TTR requirements.

6.How does Aetrix verify that 74LVX4245TTR is sourced from the original manufacturer or authorized distributors?

All 74LVX4245TTR 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 74LVX4245TTR meets industry standards.

7.What is the process for return or replacement of 74LVX4245TTR?

All 74LVX4245TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVX4245TTR, 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 74LVX4245TTR part is unused and in its original packaging.

Return procedure for 74LVX4245TTR:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 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…

2026-09-01 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…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…