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Texas Instruments SN74LVTZ245DWR

Name: SN74LVTZ245DWR
Brand: Texas Instruments
SKU: SN74LVTZ245DWR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVTZ245DWR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: SN74LVTZ245DWR.pdf

Description:: BUS TRANSCEIVER

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Product details

Overview

SN74LVTZ245DWR from Texas Instruments is an octal bus transceiver IC designed for 3.3-V V_CC operation with mixed-mode 5-V input/output tolerance, 8-bit bidirectional data flow controlled by DIR and OE pins, and bus-hold inputs eliminating external pull resistors - used in voltage-level translation between 3.3-V logic and legacy 5-V buses in embedded control backplanes.

For engineers reviewing the SN74LVTZ245DWR datasheet, SN74LVTZ245DWR pinout, SN74LVTZ245DWR application, or SN74LVTZ245DWR equivalent, key selection criteria include its 2.7–3.6-V supply range, ±64-mA output drive, 4.1–5.7-ns propagation delay at 3.3 V, high-impedance state during power sequencing, and SOIC-20 package compatibility with industrial temperature range (−40°C to 85°C).

Technical Context

This device implements asynchronous bidirectional data transfer using a dual-bus architecture with independent direction (DIR) and output-enable (OE) control logic. It features active bus-hold circuitry on all A/B port inputs, enabling stable logic levels without external biasing.

The SN74LVTZ245DWR uses Advanced BiCMOS Technology (ABT) to achieve low static power dissipation while supporting TTL-compatible 5-V signaling on I/Os with 3.3-V V_CC, and includes robust ESD protection and latch-up immunity exceeding 500 mA per JEDEC JESD-17.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - supports unregulated battery operation down to 2.7 V without functional degradation
I_OL / I_OH	64 mA / −32 mA - drives heavy capacitive loads or multiple TTL inputs directly
t_PHL/t_PLH	4.1 ns / 4.6 ns typical at V_CC = 3.3 V - enables high-speed inter-bus communication up to ~100 MHz system clock domains
Input Voltage Range	−0.5 V to 5.5 V - accepts 5-V TTL signals safely while powered from 3.3 V
Bus-Hold Current	±75 µA - maintains valid logic state on floating A/B inputs without external components
Power-Up Behavior	High-impedance outputs - prevents bus contention during power ramp-up or brownout conditions
Operating Temperature	−40°C to 85°C - qualified for industrial-grade embedded systems and control modules

Pinout & Package

SN74LVTZ245DWR is housed in a 20-pin SOIC (DW) package measuring 12.8 mm × 7.5 mm × 2.65 mm max height, compliant with JEDEC MS-013 and RoHS (Pb-Free) standards.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	DIR	Direction control: LOW routes B→A, HIGH routes A→B; internal pull-down not provided
2–9	A1–A8	Port A data I/Os with bus-hold - retain last valid logic level when floating
10	GND	Ground reference for all internal circuitry and I/O clamp diodes
11	V_CC	3.3-V supply input; decoupling capacitor required within 10 mm of pin
12–18	B1–B8	Port B data I/Os with bus-hold - tolerant of 5-V inputs while V_CC = 3.3 V
20	OE	Active-low output enable: HIGH disables both ports into high-Z state

Key Features

Feature	Design Value
Mixed-mode I/O voltage support	5-V-tolerant inputs/outputs with 3.3-V V_CC - eliminates level-shifter ICs in 3.3/5-V interface designs
Integrated bus-hold circuitry	Eliminates need for 10-kΩ external pullup/pulldown resistors on all 16 data lines
Power-up/power-down isolation	Outputs remain high-impedance during V_CC ramp - prevents back-driving or contention on shared buses
Low ground bounce (V_OLP)	<0.8 V typical at V_CC = 3.3 V - reduces noise coupling into adjacent signal traces
Latch-up immunity	Exceeds 500 mA per JEDEC JESD-17 - ensures robustness in noisy industrial environments

Applications

Industrial Backplane Interface	Legacy System Upgrades
Use Scenario: Interfacing a modern 3.3-V microcontroller unit to a legacy 5-V ISA-style peripheral bus in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional voltage-translating transceiver managing data flow between CPU and I/O expansion cards under DIR/OE software control. Use Value: Enables drop-in replacement of obsolete 5-V transceivers without redesigning power delivery or adding discrete level shifters.	Use Scenario: Retrofitting aging test equipment with new 3.3-V FPGA-based controller while retaining existing 5-V sensor interface modules. IC Role / Device Role / Timing Role: Isolates and translates control/data signals across voltage domains during read/write cycles with sub-5-ns timing margin. Use Value: Maintains full signal integrity and timing compliance while reducing board space and BOM count versus discrete resistor+buffer solutions.
Automotive Body Control Module	Communications Equipment Shelf
Use Scenario: Connecting a 3.3-V CAN controller MCU to legacy 5-V LIN bus transceivers and diagnostic ports in body electronics gateways. IC Role / Device Role / Timing Role: Direction-controlled data bridge synchronizing status updates and command responses between mixed-voltage subsystems. Use Value: Provides fail-safe high-Z behavior during cold-cranking voltage dips, preventing bus lockup or spurious resets.	Use Scenario: Enabling interoperability between 3.3-V baseband processors and 5-V RF front-end modules in cellular base station line cards. IC Role / Device Role / Timing Role: High-speed bidirectional data conduit handling configuration registers and calibration data exchange over parallel control buses. Use Value: Delivers consistent 4–5 ns propagation delay across temperature range, supporting deterministic timing in multi-slot shelf architectures.

Industrial Backplane Interface

Legacy System Upgrades

Use Scenario: Interfacing a modern 3.3-V microcontroller unit to a legacy 5-V ISA-style peripheral bus in programmable logic controllers.

IC Role / Device Role / Timing Role: Bidirectional voltage-translating transceiver managing data flow between CPU and I/O expansion cards under DIR/OE software control.

Use Value: Enables drop-in replacement of obsolete 5-V transceivers without redesigning power delivery or adding discrete level shifters.

Use Scenario: Retrofitting aging test equipment with new 3.3-V FPGA-based controller while retaining existing 5-V sensor interface modules.

IC Role / Device Role / Timing Role: Isolates and translates control/data signals across voltage domains during read/write cycles with sub-5-ns timing margin.

Use Value: Maintains full signal integrity and timing compliance while reducing board space and BOM count versus discrete resistor+buffer solutions.

Automotive Body Control Module

Communications Equipment Shelf

Use Scenario: Connecting a 3.3-V CAN controller MCU to legacy 5-V LIN bus transceivers and diagnostic ports in body electronics gateways.

IC Role / Device Role / Timing Role: Direction-controlled data bridge synchronizing status updates and command responses between mixed-voltage subsystems.

Use Value: Provides fail-safe high-Z behavior during cold-cranking voltage dips, preventing bus lockup or spurious resets.

Use Scenario: Enabling interoperability between 3.3-V baseband processors and 5-V RF front-end modules in cellular base station line cards.

IC Role / Device Role / Timing Role: High-speed bidirectional data conduit handling configuration registers and calibration data exchange over parallel control buses.

Use Value: Delivers consistent 4–5 ns propagation delay across temperature range, supporting deterministic timing in multi-slot shelf architectures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVTH245ADW	Lower drive strength (±24 mA), no bus-hold, 2.7–3.6-V only - lacks 5-V input tolerance	Suitable only for pure 3.3-V systems; requires external pull resistors	Select when cost sensitivity outweighs mixed-voltage flexibility and board space is constrained
74ALVC16245DGG	16-bit version in TSSOP-48, ±24 mA drive, 1.65–3.6-V supply - no 5-V tolerance, no bus-hold	Requires PCB redesign for wider bus width and different footprint; no direct pin compatibility	Choose for higher channel density where voltage translation is handled elsewhere in the signal chain

Compared with SN74LVTH245ADW and 74ALVC16245DGG, the SN74LVTZ245DWR uniquely combines 5-V input tolerance, integrated bus-hold, and ±64-mA drive in a standard SOIC-20 package - making it the only option among the three that supports legacy 5-V interoperability without external components or layout changes.

Availability

SN74LVTZ245DWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, automotive body control modules, legacy system upgrades, and communications equipment shelves requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVTZ245DWR 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

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and logic solutions with emphasis on reliability, power efficiency, and system integration.

The SN74LVTZ245DWR belongs to TI's ABT-family of advanced BiCMOS bus transceivers engineered for robust mixed-voltage interfacing in industrial, automotive, and communications infrastructure applications.

FAQ

What is the maximum operating voltage for SN74LVTZ245DWR?

The absolute maximum supply voltage for SN74LVTZ245DWR is 4.6 V, but the recommended operating range is strictly 2.7 V to 3.6 V per TI's SCBS303C datasheet. Exceeding 3.6 V may cause parametric shift or accelerated wear, and operation above 4.6 V risks permanent damage. The SN74LVTZ245DWR is not rated for continuous 5-V V_CC operation despite its 5-V-tolerant I/Os.

Does SN74LVTZ245DWR require external pull-up resistors on its data lines?

No, SN74LVTZ245DWR does not require external pull-up or pull-down resistors because it integrates active bus-hold circuitry on all A1–A8 and B1–B8 inputs. This feature maintains the last valid logic state on floating inputs with ±75 µA hold current, eliminating board space and BOM cost associated with discrete biasing networks - a verified design attribute confirmed in the "Features" section of the SCBS303C datasheet.

Can SN74LVTZ245DWR be used in a 5-V-only system?

No, SN74LVTZ245DWR must be powered from a 2.7–3.6-V supply (V_CC). While its inputs and outputs tolerate up to 5.5 V, applying 5 V to V_CC violates the absolute maximum rating and will damage the SN74LVTZ245DWR. It is designed exclusively for 3.3-V core logic interfacing with 5-V peripherals - never as a standalone 5-V device.

What is the thermal performance of SN74LVTZ245DWR in SOIC-DW package?

In the SOIC-DW package, SN74LVTZ245DWR has a maximum power dissipation of 1.6 W at TA = 55°C in still air, based on a junction temperature limit of 150°C and 750-mil board trace length. Its thermal resistance θ_JA is approximately 62.5°C/W, meaning a 100-mW dynamic load raises junction temperature by ~6.25°C above ambient - a value validated in TI's Package Thermal Considerations application note (SCBD002B).

Is SN74LVTZ245DWR pin-compatible with standard 74-series transceivers like 74LS245?

No, SN74LVTZ245DWR is not pin-compatible with 74LS245 or other legacy 74-series transceivers. Although both are 20-pin SOIC octal transceivers, the SN74LVTZ245DWR places DIR on pins 1/19 and OE on pin 20, whereas 74LS245 uses pin 1 for OE and pin 19 for DIR - resulting in reversed control pin assignments. Substituting without layout revision would cause functional failure.

SN74LVTZ245DWR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Input Type:: -

Output Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

SN74LVTZ245DWR FAQ

1.How can I place an order for SN74LVTZ245DWR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVTZ245DWR 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 SN74LVTZ245DWR reliable?

The price and inventory of SN74LVTZ245DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTZ245DWR is usually 5 days.

3.What payment methods are accepted for SN74LVTZ245DWR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTZ245DWR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVTZ245DWR?

SN74LVTZ245DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVTZ245DWR 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 SN74LVTZ245DWR?

For technical support, including SN74LVTZ245DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTZ245DWR requirements.

6.How does Aetrix verify that SN74LVTZ245DWR is sourced from the original manufacturer or authorized distributors?

All SN74LVTZ245DWR 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 SN74LVTZ245DWR meets industry standards.

7.What is the process for return or replacement of SN74LVTZ245DWR?

All SN74LVTZ245DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTZ245DWR, 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 SN74LVTZ245DWR part is unused and in its original packaging.

Return procedure for SN74LVTZ245DWR:

1.Submit a request within 90 days.

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

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