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

STMicroelectronics 74LVX4245MTR

Name: 74LVX4245MTR
Brand: STMicroelectronics
SKU: 74LVX4245MTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVX4245MTR

Manufacturer:: STMicroelectronics

Category:: Translators, Level Shifters

Package:

Datasheet:: 74LVX4245MTR.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:1,333

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Product details

Overview

74LVX4245MTR from STMicroelectronics is an octal dual-supply bus transceiver enabling bidirectional level translation between 5V (A-port) and 3.3V (B-port) buses, with 8.5 ns max propagation delay at VCCA=5.0V/VCCB=3.3V, ±24 mA symmetrical drive strength, and 5 µA max quiescent current per supply. It is used in mixed-voltage motherboard interconnects where isolation and direction control via DIR/G pins are required.

For engineers reviewing the 74LVX4245MTR datasheet, 74LVX4245MTR pinout, 74LVX4245MTR application, or 74LVX4245MTR equivalent, key selection criteria include dual-rail voltage tolerance (4.5–5.5V / 2.7–3.6V), high-impedance output disable timing (≤10.5 ns), ESD immunity (2 kV HBM), and SOP-24 package compatibility with legacy 74-series footprints.

Technical Context

This IC implements asynchronous bidirectional data flow using separate DIR (direction) and G (output enable) control signals, allowing independent arbitration of A→B and B→A paths. Its C2MOS process ensures latch-up immunity and rail-to-rail input thresholds compatible with both TTL and CMOS logic families across both supply domains.

All I/Os feature integrated protection diodes and support hot-swap operation with data retention down to 1.2V on either supply rail. Propagation delays tPLH and tPHL are balanced within ±0.2 ns (typ.), minimizing skew-sensitive timing violations in synchronous bus transfers.

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 bus operation with setup margin
Supply Voltage Range	VCCA: 4.5–5.5V; VCCB: 2.7–3.6V - supports industrial-grade 5V/3.3V mixed-rail systems
Output Drive Strength	\|IOH\| = \|IOL\| = 24 mA min - drives standard 50 Ω transmission lines or 10 TTL loads
Quiescent Current	ICCA = ICCB = 5 µA max at TA=25°C - suitable for low-power standby modes
ESD Immunity	2 kV HBM on all pins - eliminates need for external transient suppression in board-level design
Dynamic Output Skew	tOSLH/tOSHL ≤ 1.5 ns - maintains signal integrity across all 8 channels in parallel data transfer

Pinout & Package

SOP-24 (SO-24) package, 15.2–15.6 mm × 10.0–10.65 mm body, 1.27 mm pitch, plastic body with gull-wing leads.

Pin/Terminal	Circuit Role	Design Meaning
1, 24	VCCA / VCCB	Independent 5V and 3.3V supplies - decoupling capacitors must be placed locally per rail
2	DIR	Direction control: LOW = A→B, HIGH = B→A - synchronous with data edges, no internal delay added
3–10	A1–A8	5V-side bidirectional I/Os - tolerate 0–5.5V inputs; clamp to VCCA when overvoltage detected
14–21	B1–B8	3.3V-side bidirectional I/Os - tolerate 0–3.6V inputs; clamp to VCCB under fault conditions
22	G	Output enable: LOW = active, HIGH = high-Z - disables both A and B ports simultaneously
11–13	GND	Dedicated ground pins for noise isolation - must be connected to common system ground plane
23	NC	No connect - internally unconnected; must remain floating or grounded per layout best practice

Key Features

Feature	Design Value
Dual-rail level translation	Supports simultaneous 5V↔3.3V conversion without external resistors or direction logic
Asymmetric enable timing	tPZH/tPHZ ≤ 6.5 ns (A-port), tPZH/tPHZ ≤ 8.0 ns (B-port) - minimizes bus contention during state transitions
Data retention at low voltage	Maintains I/O state down to 1.2V on either supply - enables graceful shutdown in brown-out conditions
Low-noise switching	VOLP = 0.3V typ. at VCCA=5.5V/VCCB=3.3V - reduces ground bounce in dense PCB layouts
Pin-compatible upgrade	Replaces 74LS4245 and 74ALS4245 without footprint or schematic changes

Applications

Industrial PLC Backplane

Embedded CPU Memory Interface

Use Scenario: Interfacing a 5V FPGA configuration bus to a 3.3V SDRAM controller on a modular I/O carrier board.

IC Role / Device Role / Timing Role: Bidirectional level translator managing address/data strobes with sub-10 ns timing budget.

Use Value: Eliminates discrete resistor networks while maintaining tSU/tH compliance across temperature (-40°C to +85°C).

Use Scenario: Connecting a 5V microcontroller's parallel bus to a 3.3V NOR flash memory in a medical data logger.

IC Role / Device Role / Timing Role: Direction-controlled transceiver synchronizing read/write cycles with DIR-driven phase alignment.

Use Value: Enables single-cycle access with guaranteed tPLH/tPHL matching, reducing firmware wait-state overhead.

Automotive Infotainment Head Unit

Test Equipment Digital I/O Module

Use Scenario: Bridging a 5V CAN protocol analyzer ASIC to a 3.3V ARM-based display processor in a dashboard cluster.

IC Role / Device Role / Timing Role: Isolated bus interface with G-controlled power-down during sleep mode.

Use Value: Achieves <5 µA total standby current by disabling both ports, meeting ISO 11898-3 quiescent requirements.

Use Scenario: Level-shifting between a 5V pattern generator and 3.3V DUT in automated functional test fixtures.

IC Role / Device Role / Timing Role: Hot-pluggable I/O buffer with NC pin reserved for future calibration trace routing.

Use Value: Tolerates repeated insertion cycles without latch-up due to enhanced C2MOS process immunity.

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 fCLK (100 MHz), but only 24 mA drive at 3.3V	Supports 1.8V/2.5V/3.3V interfaces; not rated for -55°C operation	Select for multi-voltage flexibility where extended temperature range is not required
74ALVC164245DT	16-bit version in TSSOP-48; 3.6V VCCB max; 20 mA drive; no 1.2V data retention	Used in high-density memory expansion modules requiring wider bus width	Select when doubling channel count is needed and SOP-24 footprint is unavailable

Compared with SN74LVC4245APWR and 74ALVC164245DT, the 74LVX4245MTR offers superior cold-temperature performance (-55°C), guaranteed 1.2V data retention, and tighter skew control-making it optimal for aerospace, industrial control, and automotive subsystems where reliability under voltage droop is critical.

Availability

74LVX4245MTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded CPU memory interfaces, and automotive infotainment head units requiring stable component supply across extended temperature and voltage ranges.

Supply support for 74LVX4245MTR 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 capability and AEC-Q100 qualification expertise.

The 74LVX series targets low-voltage mixed-signal interfacing in harsh environments, emphasizing latch-up immunity, wide supply tolerance, and long-term parametric stability for mission-critical embedded systems.

FAQ

Can 74LVX4245MTR operate with VCCA = 5.5V and VCCB = 2.7V simultaneously?

Yes. The device is fully specified for concurrent operation across its full recommended ranges: VCCA = 4.5–5.5V and VCCB = 2.7–3.6V. DC and AC parameters-including VOLB = 0.40V max at 8 mA load and tPLH = 10.0 ns max-are guaranteed under these conditions per datasheet pages 4–6.

What is the maximum capacitive load the 74LVX4245MTR can drive on the B-port?

The B-port is characterized up to 50 pF load capacitance in AC testing (page 6), with tPLH/tPHL measured at CL = 50 pF and input rise/fall time = 3 ns. Driving >50 pF may increase propagation delay beyond 10 ns and require empirical validation of signal integrity at target frequency.

Is Pin 23 (NC) required to be left floating, or can it be grounded?

Pin 23 is internally unconnected and must remain unconnected in the PCB layout. Grounding or tying it to any voltage violates the absolute maximum rating for unused pins and risks unintended current paths or ESD discharge coupling into adjacent signal lines.

Does the 74LVX4245MTR support hot-swap insertion while powered?

Yes. Its input protection circuitry and 2 kV HBM ESD rating allow safe insertion into live 5V/3.3V backplanes. However, G must be held HIGH (disable) during insertion to prevent bus contention, and VCCA/VCCB sequencing should follow manufacturer-recommended ramp rates (<1 V/ms) to avoid latch-up.

74LVX4245MTR 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-SOIC (0.295", 7.50mm Width)

74LVX4245MTR FAQ

1.How can I place an order for 74LVX4245MTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVX4245MTR 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 74LVX4245MTR reliable?

The price and inventory of 74LVX4245MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVX4245MTR is usually 5 days.

3.What payment methods are accepted for 74LVX4245MTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVX4245MTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LVX4245MTR?

74LVX4245MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVX4245MTR 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 74LVX4245MTR?

For technical support, including 74LVX4245MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVX4245MTR requirements.

6.How does Aetrix verify that 74LVX4245MTR is sourced from the original manufacturer or authorized distributors?

All 74LVX4245MTR 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 74LVX4245MTR meets industry standards.

7.What is the process for return or replacement of 74LVX4245MTR?

All 74LVX4245MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVX4245MTR, 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 74LVX4245MTR part is unused and in its original packaging.

Return procedure for 74LVX4245MTR:

1.Submit a request within 90 days.

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

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