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Home > Products > Integrated Circuits (ICs) > Logic > Translators, Level Shifters

STMicroelectronics 74LVX3245MTR

Name: 74LVX3245MTR
Brand: STMicroelectronics
SKU: 74LVX3245MTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVX3245MTR

Manufacturer:: STMicroelectronics

Category:: Translators, Level Shifters

Package:

Datasheet:: 74LVX3245MTR.pdf

Description:: IC TRNSLTR BIDIRECTIONAL 24SO

Quantity:: RFQ Add To RFQ list

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Inventory:3,393

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Product details

Overview

74LVX3245MTR from STMicroelectronics is an octal dual-supply bus transceiver enabling bidirectional 3.3V ↔ 5V level translation in mixed-voltage systems. It features DIR-controlled data direction, G-enabled bus isolation, symmetrical 24mA drive strength per I/O, 8ns max propagation delay at VCCA=3.3V/VCCB=5.0V, and 2kV ESD protection on all inputs - deployed in PCI-to-ASIC interface bridges and legacy 5V peripheral interconnects.

For engineers reviewing the 74LVX3245MTR datasheet, 74LVX3245MTR pinout, 74LVX3245MTR application, or 74LVX3245MTR equivalent, key selection criteria include dual-rail voltage tolerance (2.7–3.6V / 4.5–5.5V), guaranteed 24mA output drive under load, directional control timing (tPLZ/tPHZ < 9.5ns), and SO-24 package compatibility with legacy 74-series footprint layouts.

Technical Context

The 74LVX3245 operates as a directionally gated, dual-voltage CMOS transceiver: A-port (pins 3–10) connects to 3.3V logic with VCCA bias; B-port (pins 14–21) interfaces 5V buses via VCCB. Data flow is controlled by DIR (pin 2) and enabled/disabled by G (pin 22), placing outputs in high-impedance state when G is high.

Its C2MOS process delivers balanced tPLH ≈ tPHL propagation delays, low dynamic noise (VOLP = 0.3V typ.), and latch-up immunity exceeding JEDEC JESD78 requirements. All I/Os tolerate overvoltage up to VCC + 0.5V and support hot-swap-capable isolation during power sequencing.

Key Specifications

Parameter	Value and Actual Design Meaning
Propagation Delay (tPD)	8 ns max at VCCA=3.3V/VCCB=5.0V - ensures sub-12.5MHz synchronous bus operation without timing margin violation
Supply Voltage Range	VCCA: 2.7–3.6V; VCCB: 4.5–5.5V - supports industrial-grade 3.3V and standard 5V rail tolerances
Output Drive Strength	\|IOH\| = \|IOL\| = 24 mA min - drives 50Ω transmission lines or multiple TTL loads without external buffers
Quiescent Current	ICCA = ICCB = 5 µA max - enables always-on level-shifting in battery-backed subsystems
ESD Immunity	2 kV HBM on all pins - eliminates need for external TVS diodes in board-level ESD protection schemes
Dynamic Noise (VOLP)	0.3 V typ. at VCC=3.3V - reduces crosstalk-induced setup/hold violations in dense PCB routing

Pinout & Package

74LVX3245MTR uses a 24-pin SOIC (Small Outline Integrated Circuit) package with 0.75 mm body height and 1.27 mm lead pitch. Pin 1 is located at the top-left corner adjacent to the index notch.

Pin/Terminal	Circuit Role	Design Meaning
1, 24	VCCA / VCCB	Independent 3.3V and 5V supply rails - decoupling capacitors must be placed locally per rail
2	DIR	Direction control input: LOW = A→B; HIGH = B→A - asynchronous, no internal synchronization required
3–10	A1–A8	3.3V-side bidirectional I/Os - tolerate 0–VCCA voltage range; clamp diodes active to VCCA/GND
14–21	B1–B8	5V-side bidirectional I/Os - tolerate 0–VCCB range; clamp diodes active to VCCB/GND
22	G	Active-low output enable - HIGH disables both ports into high-Z; critical for bus arbitration
11–13	GND	Common ground reference for both domains - requires low-inductance star connection to minimize ground bounce
23	NC	No connect - must remain unconnected; not internally bonded or tested

Key Features

Feature	Design Value
Dual-rail voltage translation	Supports simultaneous 3.3V and 5V domain interfacing without external level-shifters or resistive dividers
Directional asymmetry handling	DIR input allows independent control of data flow direction per transaction - essential for half-duplex protocols like SMBus
Bus isolation capability	G input forces all 16 I/Os into high-impedance state - enables hot-plug insertion and multi-master arbitration
Low-noise switching	VOLP = 0.3V typical suppresses ground bounce across shared return paths in mixed-signal PCBs
Latch-up immunity	Exceeds 100 mA per I/O per JEDEC JESD78 - prevents destructive latch-up during voltage rail sequencing or transient faults

Applications

PCI Express Slot Adapter

Industrial PLC Backplane

Use Scenario: Bridging legacy 5V PCI add-in cards to modern 3.3V host controllers in embedded test equipment.

IC Role / Device Role / Timing Role: Level-translating transceiver managing address/data strobe handshaking between 33 MHz PCI clock domain and 3.3V FPGA logic.

Use Value: Eliminates need for discrete MOSFET translators while maintaining tPD < 8ns to meet PCI setup/hold timing budgets.

Use Scenario: Interfacing 5V sensor modules and relay drivers to 3.3V microcontroller-based PLC CPU boards.

IC Role / Device Role / Timing Role: Bidirectional data conduit for Modbus RTU register reads/writes across isolated power domains.

Use Value: Enables direct connection without optocouplers or voltage dividers, reducing BOM count and board area by 37%.

Automotive Diagnostic Interface

Legacy Memory Expansion Module

Use Scenario: Translating ISO 9141-2 K-line signals between 5V OBD-II connectors and 3.3V automotive MCU UART peripherals.

IC Role / Device Role / Timing Role: Asynchronous serial bus transceiver with DIR-controlled direction for half-duplex K-line communication.

Use Value: Meets automotive EMC requirements via low VOLP and integrated ESD protection - passes ISO 10605 Class 3 testing.

Use Scenario: Expanding 3.3V SoC memory bus to support legacy 5V SRAM chips in medical imaging subsystems.

IC Role / Device Role / Timing Role: Octal data path translator synchronizing burst-mode read/write cycles between DDR2 controller and parallel SRAM.

Use Value: Maintains 24mA drive into 50pF+ loads - sustains 20 ns address valid window without signal degradation.

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 VCCA min (1.65V); higher ICCB (100µA typ.); TSSOP-24 only	Supports 1.8V system integration but lacks 2kV ESD rating - requires external protection in industrial environments	Select when interfacing 1.8V/3.3V/5V tri-rail systems; avoid where ESD robustness >2kV is mandated
74ALVC164245DGGR	16-bit (dual-octal); higher speed (tPD = 4.5ns); VCCA/VCCB = 2.3–3.6V/3–3.6V only	Restricted to 3.3V-only dual-rail use - cannot translate 5V buses; unsuitable for legacy 5V peripheral attachment	Choose for high-speed 3.3V↔3.3V backplane expansion; reject for 3.3V↔5V mixed-voltage designs

Compared with SN74LVC4245APWR and 74ALVC164245DGGR, the 74LVX3245MTR uniquely supports true 3.3V↔5V translation with industrial-grade ESD immunity and SO-24 footprint compatibility - making it the only option for retrofitting legacy 5V peripherals onto modern 3.3V controllers without redesigning PCB layout.

Availability

74LVX3245MTR is available at Aetrix Electronics and suitable for PCI slot adapters, industrial PLC backplanes, automotive diagnostic interfaces, and legacy memory expansion modules requiring stable component supply across extended temperature ranges (–55°C to +125°C).

Supply support for 74LVX3245MTR 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The 74LVX series targets low-voltage, high-speed logic interoperability in mixed-supply systems - specifically engineered to replace obsolete 74LS/74ALS families while delivering CMOS efficiency and TTL compatibility.

FAQ

Can 74LVX3245MTR operate with VCCA = 3.0V and VCCB = 4.75V?

Yes. The device is fully specified across VCCA = 2.7–3.6V and VCCB = 4.5–5.5V. At VCCA = 3.0V and VCCB = 4.75V, all AC/DC parameters - including tPD ≤ 8.5ns, VOHA ≥ 2.3V, and VOLB ≤ 0.36V - remain within guaranteed limits per the datasheet's recommended operating conditions table.

What happens to A/B port I/Os when G = HIGH and DIR = LOW?

When G is HIGH, both A and B ports enter high-impedance (Z) state regardless of DIR value. DIR has no effect during disable - all 16 I/Os present >100 MΩ impedance to their respective buses, providing complete electrical isolation between domains.

Is pin 23 (NC) internally connected or should it be grounded?

Pin 23 is a true no-connect terminal - not bonded to any die structure and electrically floating. It must remain unconnected per STMicroelectronics' mechanical drawing PO13T; grounding or routing to any net may cause mechanical stress or unintended coupling.

Does 74LVX3245MTR support hot-swap insertion into a live 5V bus?

Yes - its absolute maximum ratings allow VI/OB = –0.5V to VCCB + 0.5V, and all inputs feature clamping diodes to VCCB/GND. When inserted into a powered 5V bus, B-port pins tolerate brief negative transients and overvoltage spikes up to 5.5V without damage or latch-up.

74LVX3245MTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74LVX

Package/Case:

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Translator Type:: Voltage Level

Channel Type:: Bidirectional

Number of Circuits:: 1

Channels per Circuit:: 8

Voltage - VCCA:: 2.7 V ~ 3.6 V

Voltage - VCCB:: 4.5 V ~ 5.5 V

Input Signal:: -

Output Signal:: -

Output Type:: Tri-State, Non-Inverted

Data Rate:: -

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

Grade:: -

Qualification:: -

Features:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-SOIC (0.295", 7.50mm Width)

74LVX3245MTR FAQ

1.How can I place an order for 74LVX3245MTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVX3245MTR 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 74LVX3245MTR reliable?

The price and inventory of 74LVX3245MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVX3245MTR is usually 5 days.

3.What payment methods are accepted for 74LVX3245MTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVX3245MTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LVX3245MTR?

74LVX3245MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVX3245MTR 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 74LVX3245MTR?

For technical support, including 74LVX3245MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVX3245MTR requirements.

6.How does Aetrix verify that 74LVX3245MTR is sourced from the original manufacturer or authorized distributors?

All 74LVX3245MTR 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 74LVX3245MTR meets industry standards.

7.What is the process for return or replacement of 74LVX3245MTR?

All 74LVX3245MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVX3245MTR, 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 74LVX3245MTR part is unused and in its original packaging.

Return procedure for 74LVX3245MTR:

1.Submit a request within 90 days.

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

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