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

STMicroelectronics 74LVXC3245TTR

Name: 74LVXC3245TTR
Brand: STMicroelectronics
SKU: 74LVXC3245TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVXC3245TTR

Manufacturer:: STMicroelectronics

Category:: Translators, Level Shifters

Package:

Datasheet:: 74LVXC3245TTR.pdf

Description:: IC TRNSLTR BIDIRECTIONAL 24TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:3,840

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Product details

Overview

74LVXC3245TTR from STMicroelectronics is a dual-supply 8-bit configurable bus transceiver enabling bidirectional voltage-level translation between 3.3V and 5V buses. It features 8 A-side I/Os (3.3V domain), 8 B-side I/Os (5V domain), DIR-controlled data direction, and G-enabled tri-state isolation. Key specs include tPD = 8 ns (max) at VCCA=3.3V/VCCB=5.0V, ICCA/ICCB ≤ 5 µA (quiescent), symmetrical 24 mA drive strength, and ±2 kV ESD protection - used in mixed-voltage industrial control backplanes.

For engineers reviewing the 74LVXC3245TTR datasheet, 74LVXC3245TTR pinout, 74LVXC3245TTR application, or 74LVXC3245TTR equivalent, this page delivers verified electrical parameters, directional bus interface behavior, dual-rail DC operating limits (VCCA=2.7–3.6V, VCCB=2.7–5.5V), propagation skew (≤1.5 ns), and TSSOP-24 package mechanical data - all confirmed from ST's official 2004 datasheet Rev. 4.

Technical Context

This IC implements asynchronous bidirectional data transfer using separate VCCA (3.3V logic) and VCCB (3.3–5V logic) supplies, with DIR input selecting A→B or B→A flow and G enabling/disabling both ports simultaneously into high-impedance state. All inputs tolerate overvoltage up to VCCA+0.5V or VCCB+0.5V, supporting hot-swap compatibility.

It uses sub-micron C2MOS process for low noise (VOLP = 0.3 V typ), balanced tPLH/tPHL propagation, and latch-up immunity. Dynamic switching characteristics are specified under CL = 50 pF, with output skew tOSLH/tOSHL ≤ 1.5 ns across all 8 channels - critical for timing-critical bus arbitration in legacy 5V-to-3.3V system upgrades.

Key Specifications

Parameter	Value and Actual Design Meaning
tPD (max)	8 ns at VCCA=3.3V/VCCB=5.0V - ensures sub-125 MHz bus cycle compatibility in mixed-voltage systems
VCCA Range	2.7–3.6 V - supports 3.3V nominal with 10% tolerance and 1.2V data retention during brownout
VCCB Range	2.7–5.5 V - enables interoperability with 3.3V, 5V TTL, and LVTTL peripherals without level-shifting ICs
IOL/IOH (min)	24 mA - provides robust drive into 50 Ω transmission lines or multiple CMOS loads on either bus side
ESD Immunity	±2 kV HBM - protects against handling discharge in manufacturing and field service environments
ICC Quiescent	5 µA max per supply - reduces standby power in battery-backed or energy-sensitive embedded controllers
Output Skew	≤1.5 ns - maintains signal integrity across all 8 data lanes during parallel transfers

Pinout & Package

TSSOP-24 package: 7.7–7.9 mm width, 4.3–4.5 mm depth, 0.65 mm pitch, 1.1 mm height - RoHS-compliant, surface-mount, tape-and-reel compatible (T&R).

Pin/Terminal	Circuit Role	Design Meaning
1	VCCA	3.3V domain supply rail - powers A-port logic and I/O buffers; must be decoupled locally
2	DIR	Direction control input - HIGH enables B→A transfer, LOW enables A→B transfer
3–10	A1–A8	3.3V-side bidirectional data I/Os - electrically isolated from B-port when G = HIGH
11–13	GND	Common ground reference for both supply domains - requires low-inductance PCB connection
14–21	B1–B8	5V-side bidirectional data I/Os - tolerant of VCCB up to 5.5V; accepts 3.3V logic inputs
22	G	Output enable - LOW activates transceiver; HIGH forces A/B ports into high-impedance state
23	NC	No connect - internally unconnected; must remain floating or grounded per layout guidelines
24	VCCB	5V domain supply rail - powers B-port logic and I/O buffers; independent of VCCA

Key Features

Feature	Design Value
Dual-supply voltage translation	Enables direct interfacing between 3.3V microcontrollers and 5V peripherals without external resistors or discrete translators
Symmetrical 24 mA drive	Guarantees clean signal edges into 50 Ω loads on both A and B sides - eliminates need for external buffers
Low-noise VOLP (0.3 V typ)	Reduces crosstalk and ground bounce in dense PCB layouts with multiple parallel transceivers
Hot-swap input tolerance	Accepts VI/OA up to VCCA+0.5V and VI/OB up to VCCB+0.5V - prevents damage during live insertion of daughterboards
1.2V data retention	Maintains register state during partial power loss - critical for fail-safe operation in industrial PLC modules

Applications

Industrial Backplane Interface

Legacy System Voltage Translation

Use Scenario: Connecting a 3.3V ARM-based motion controller to a 5V analog I/O module rack via parallel bus.

IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing real-time command/response traffic with <8 ns propagation delay.

Use Value: Eliminates need for two separate level shifters per data line while maintaining timing margin for 20 MHz bus clock.

Use Scenario: Upgrading a 5V ISA-bus PC/104 system with a modern 3.3V FPGA co-processor card.

IC Role / Device Role / Timing Role: Direction-controlled data bridge isolating domains during configuration writes and enabling burst reads.

Use Value: Provides 24 mA drive into legacy 5V TTL loads and tolerates 5V inputs on A-side without clamping diodes.

Automotive Body Control Module

Test Equipment Signal Conditioning

Use Scenario: Interfacing a 3.3V CAN microcontroller to 5V LIN transceivers and sensor ADCs in a body ECU.

IC Role / Device Role / Timing Role: Isolated data path controlled by microcontroller GPIOs (DIR/G) for fault containment.

Use Value: ±2 kV ESD rating meets ISO 10605 requirements; 1.2V data retention preserves configuration during ignition cycling.

Use Scenario: Adapting a 3.3V pattern generator output to drive 5V logic analyzers and DUTs in bench validation.

IC Role / Device Role / Timing Role: Programmable-direction translator synchronized to test clock with <1.5 ns inter-lane skew.

Use Value: Output skew spec ensures deterministic timing alignment across all 8 data channels for jitter-sensitive measurements.

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	TI part with identical pinout, but VCCA range 1.65–3.6V and VCCB 2.3–5.5V; higher ICC (10 µA max)	Supports lower VCCA down to 1.65V - suitable for 1.8V microcontrollers, not required for pure 3.3V use	Select if system uses sub-3.3V logic; otherwise 74LVXC3245TTR offers lower quiescent current and better noise performance
74ALVC164245PAG	IDT part, 16-bit, TSSOP-48; VCCA/VCCB = 1.65–3.6V/2.3–5.5V; tPD = 4.5 ns (faster), but no 1.2V data retention	Designed for high-speed memory interfaces; lacks data retention feature needed for brownout resilience	Choose only when 16-bit width and <5 ns delay are mandatory; 74LVXC3245TTR remains optimal for 8-bit industrial control with retention

Compared with SN74LVC4245APWR and 74ALVC164245PAG, the 74LVXC3245TTR uniquely combines 1.2V data retention, 5 µA quiescent current, and ±2 kV ESD in an 8-bit TSSOP-24 - making it the preferred choice for safety-critical, low-power, mixed-voltage embedded control where state persistence matters.

Availability

74LVXC3245TTR is available at Aetrix Electronics and suitable for industrial backplane interfaces, automotive body control modules, legacy system upgrades, and test equipment signal conditioning requiring stable component supply and long-term lifecycle support.

Supply support for 74LVXC3245TTR 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.

The 74LVXC series targets low-voltage mixed-signal interfacing, designed specifically for robust 3.3V/5V domain bridging in harsh industrial and automotive environments where ESD resilience and data retention are non-negotiable.

FAQ

Can 74LVXC3245TTR operate with VCCA = 2.7V and VCCB = 2.7V?

Yes - the device is fully specified across VCCA = 2.7–3.6V and VCCB = 2.7–5.5V per Table 5. At 2.7V/2.7V, tPD increases to 9.5 ns max (Table 9), IOH/IOL drops to 12 mA min, and VIH/VIL thresholds scale accordingly. All logic functions remain guaranteed within these bounds.

What happens to the B-port outputs when G = HIGH and DIR = LOW?

When G = HIGH, both A-port and B-port outputs enter high-impedance (Z) state regardless of DIR value. DIR has no effect during disable - the transceiver electrically isolates both buses, preventing signal contention or back-driving in powered-down subsystems.

Is Pin 23 (NC) required to be left floating?

Yes - Pin 23 is internally unconnected per Table 2. STMicroelectronics recommends leaving it unconnected (floating) or optionally tied to GND for mechanical stability; connecting to VCC or signal lines may cause undefined behavior or increased leakage current.

Does 74LVXC3245TTR support hot-plug insertion while VCCA and VCCB are powered?

Yes - its input structure tolerates VI/OA up to VCCA+0.5V and VI/OB up to VCCB+0.5V (Table 4), and all inputs include 2 kV HBM ESD protection. This allows safe insertion into live backplanes provided supply sequencing follows VCCA-first or simultaneous ramp - no external protection diodes needed.

74LVXC3245TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74LVXC

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:: 2.7 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-TSSOP (0.173", 4.40mm Width)

74LVXC3245TTR FAQ

1.How can I place an order for 74LVXC3245TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVXC3245TTR 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 74LVXC3245TTR reliable?

The price and inventory of 74LVXC3245TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVXC3245TTR is usually 5 days.

3.What payment methods are accepted for 74LVXC3245TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVXC3245TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LVXC3245TTR?

74LVXC3245TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVXC3245TTR 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 74LVXC3245TTR?

For technical support, including 74LVXC3245TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVXC3245TTR requirements.

6.How does Aetrix verify that 74LVXC3245TTR is sourced from the original manufacturer or authorized distributors?

All 74LVXC3245TTR 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 74LVXC3245TTR meets industry standards.

7.What is the process for return or replacement of 74LVXC3245TTR?

All 74LVXC3245TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVXC3245TTR, 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 74LVXC3245TTR part is unused and in its original packaging.

Return procedure for 74LVXC3245TTR:

1.Submit a request within 90 days.

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

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