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Texas Instruments SN74LVT245BDWG4

Name: SN74LVT245BDWG4
Brand: Texas Instruments
SKU: SN74LVT245BDWG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVT245BDWG4

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: SN74LVT245BDWG4.pdf

Description:: IC TXRX NON-INVERT 3.6V 20SOIC

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Product details

Overview

SN74LVT245BDWG4 from Texas Instruments is a 3.3-V ABT octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 3.3-V and 5-V logic domains. It supports mixed-mode signal operation (5-V inputs/outputs with 3.3-V V_CC), delivers 64 mA sink current per output, and features I_off and power-up 3-state for hot insertion in backplane or modular systems.

For engineers reviewing the SN74LVT245BDWG4 datasheet, SN74LVT245BDWG4 pinout, SN74LVT245BDWG4 application, or SN74LVT245BDWG4 equivalent, key selection criteria include its 2.7–3.6 V supply range, 3.5 ns max propagation delay at 3.3 V, support for unregulated battery operation, latch-up immunity >100 mA, and SOIC-20 package compatibility with legacy PCB layouts.

Technical Context

The SN74LVT245BDWG4 implements an advanced BiCMOS ABT (Advanced Bus Transceiver) architecture enabling TTL-level interface compatibility while operating from a 3.3-V supply. Its direction-control (DIR) and output-enable (OE) inputs govern bidirectional data flow between A and B buses, with OE asserting high-impedance isolation during power sequencing.

It integrates I_off circuitry to block current backflow when powered down and power-up 3-state logic to hold outputs high-impedance during V_CC ramp-up. Input clamp diodes support 5.5-V tolerant inputs, and output ground bounce (V_OLP) is specified <0.8 V at 3.3 V and 25°C - critical for noise-sensitive digital systems.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.7 V to 3.6 V - enables stable operation under unregulated battery or low-dropout regulator supplies.
I_OL (max)	64 mA per output - supports driving standard TTL loads and moderate-capacitance buses without external buffers.
t_PLH/t_PHL	3.5 ns max at V_CC = 3.3 V - ensures sub-4 ns propagation for high-speed 32-bit or 64-bit parallel bus timing budgets.
V_IH/V_IL	2.0 V / 0.8 V - compatible with both 3.3-V LVTTL and 5-V TTL input thresholds for seamless level translation.
I_off	±100 μA at V_CC = 0 - prevents damaging back-current during hot-swap events in modular backplanes or docking stations.
ESD Rating	2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade robustness requirements for field-deployable equipment.
θ_JA	58°C/W (SOIC-DW) - allows thermal design margin up to 85°C ambient with ≤300 mW total dissipation under typical switching conditions.

Pinout & Package

SN74LVT245BDWG4 is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm footprint, 2.65 mm max height, with 1.27 mm lead pitch and gull-wing leads. Pin 1 index located at top-left corner with beveled edge marking.

Pin/Terminal	Circuit Role	Design Meaning
1 (DIR)	Direction control input	Low = B→A data transfer; High = A→B data transfer - enables dynamic bus arbitration in master-slave or peer-to-peer configurations.
2–9 (A1–A8)	Port A data inputs/outputs	Bidirectional I/O pins connected to local subsystem bus (e.g., microcontroller data bus).
10 (GND)	Ground reference	Primary return path for all I/O and internal logic - must be low-inductance connection to minimize ground bounce.
11 (V_CC)	Power supply	3.3-V core supply - requires local 0.1 μF ceramic decoupling adjacent to pin for high-frequency noise suppression.
12 (OE)	Output enable input	Low = outputs active; High = all A/B pins enter high-impedance - used for bus isolation during reset or sleep modes.
13–20 (B1–B8)	Port B data inputs/outputs	Bidirectional I/O pins connected to remote subsystem bus (e.g., peripheral or memory expansion bus).

Key Features

Feature	Design Value
Mixed-mode signal operation	5-V-tolerant inputs/outputs with 3.3-V V_CC - eliminates need for external level shifters in hybrid-voltage systems.
Hot-insertion support	I_off + power-up 3-state - enables safe live replacement of cards in telecom line cards or server backplanes without system shutdown.
Low output ground bounce	V_OLP < 0.8 V at 3.3 V - reduces simultaneous switching noise (SSN) that could corrupt adjacent signal integrity or clock jitter.
Latch-up immunity	Exceeds 100 mA per JESD 78 Class II - ensures reliability in noisy industrial environments with transient coupling or EFT exposure.
Wide temperature range	−40°C to +85°C operation - qualified for extended industrial and automotive under-hood applications requiring no derating.

Applications

Industrial PLC Backplane Interface	Embedded Computing Memory Expansion
Use Scenario: Interfacing a 3.3-V ARM-based controller CPU bus to legacy 5-V SRAM or FPGA configuration memory on a modular I/O carrier board. IC Role / Device Role / Timing Role: Bidirectional level-translating bus transceiver managing address/data/control signals with sub-4 ns propagation to meet tight 25-MHz bus timing. Use Value: Eliminates discrete resistor-divider or dedicated level-shifter ICs, reducing BOM count and layout area while maintaining full 5-V TTL drive capability.	Use Scenario: Expanding DRAM capacity on a medical imaging processor board where main SoC operates at 3.3 V but DDR SDRAM modules use 5-V tolerant control lines. IC Role / Device Role / Timing Role: Isolating and translating chip-select, write-enable, and address strobe signals between voltage domains with controlled slew rate (10 ns/V). Use Value: Enables direct integration of off-the-shelf 5-V peripherals without redesigning power delivery or adding complex voltage translators.
Telecom Line Card Hot-Swap Module	Automotive Diagnostic Gateway Interface
Use Scenario: Supporting hot-plug capability in a modular base station line card where daughterboards are inserted/removed while the backplane remains powered. IC Role / Device Role / Timing Role: Providing bus isolation via OE-controlled 3-state and preventing back-current via I_off during insertion sequence. Use Value: Meets GR-1089-CORE surge and ESD requirements while eliminating risk of bus contention or supply rail collapse during module swap.	Use Scenario: Bridging CAN controller (3.3-V logic) to legacy 5-V diagnostic port hardware in vehicle service tools or OBD-II adapters. IC Role / Device Role / Timing Role: Level-shifting UART or parallel debug interface signals while maintaining ESD robustness required for workshop environments. Use Value: Achieves ISO 10605-compliant 15-kV air-gap ESD protection through integrated 2000-V HBM structure, reducing external TVS count.

Industrial PLC Backplane Interface

Embedded Computing Memory Expansion

Use Scenario: Interfacing a 3.3-V ARM-based controller CPU bus to legacy 5-V SRAM or FPGA configuration memory on a modular I/O carrier board.

IC Role / Device Role / Timing Role: Bidirectional level-translating bus transceiver managing address/data/control signals with sub-4 ns propagation to meet tight 25-MHz bus timing.

Use Value: Eliminates discrete resistor-divider or dedicated level-shifter ICs, reducing BOM count and layout area while maintaining full 5-V TTL drive capability.

Use Scenario: Expanding DRAM capacity on a medical imaging processor board where main SoC operates at 3.3 V but DDR SDRAM modules use 5-V tolerant control lines.

IC Role / Device Role / Timing Role: Isolating and translating chip-select, write-enable, and address strobe signals between voltage domains with controlled slew rate (10 ns/V).

Use Value: Enables direct integration of off-the-shelf 5-V peripherals without redesigning power delivery or adding complex voltage translators.

Telecom Line Card Hot-Swap Module

Automotive Diagnostic Gateway Interface

Use Scenario: Supporting hot-plug capability in a modular base station line card where daughterboards are inserted/removed while the backplane remains powered.

IC Role / Device Role / Timing Role: Providing bus isolation via OE-controlled 3-state and preventing back-current via I_off during insertion sequence.

Use Value: Meets GR-1089-CORE surge and ESD requirements while eliminating risk of bus contention or supply rail collapse during module swap.

Use Scenario: Bridging CAN controller (3.3-V logic) to legacy 5-V diagnostic port hardware in vehicle service tools or OBD-II adapters.

IC Role / Device Role / Timing Role: Level-shifting UART or parallel debug interface signals while maintaining ESD robustness required for workshop environments.

Use Value: Achieves ISO 10605-compliant 15-kV air-gap ESD protection through integrated 2000-V HBM structure, reducing external TVS count.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVTH245PWRE4	Lower drive strength (I_OL = 32 mA), higher t_P (5.5 ns max), LVTH family - optimized for lower power, not mixed-voltage tolerance.	Not rated for 5-V inputs; requires external clamping if interfacing to 5-V buses.	Select only for pure 3.3-V systems where power budget is constrained and 5-V interoperability is unnecessary.
74ALVC16245DGGR	16-bit dual-octet, 3.3-V only, no 5-V input tolerance, higher I_OL (64 mA), same SOIC-20 footprint but different pinout.	Cannot replace SN74LVT245BDWG4 without PCB redesign due to non-matching DIR/OE placement and A/B port mapping.	Consider only for new designs requiring wider bus width and where 5-V interface is absent; not a drop-in alternative.

Compared with SN74LVTH245PWRE4 and 74ALVC16245DGGR, the SN74LVT245BDWG4 uniquely combines 5-V input tolerance, 64 mA drive, and SOIC-20 pinout compatibility - making it the sole option for retrofitting legacy 5-V systems with modern 3.3-V controllers without layout changes.

Availability

SN74LVT245BDWG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, embedded memory expansion interfaces, telecom line card hot-swap modules, and automotive diagnostic gateways requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVT245BDWG4 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 specializing in analog, embedded processing, and connectivity solutions, with over 50 years of innovation in logic, power management, and signal chain technologies.

The SN74LVT245BDWG4 belongs to TI's ABT logic family, engineered specifically for high-speed, mixed-voltage bus interfacing in industrial automation, communications infrastructure, and automotive electronics where reliability and voltage-domain bridging are critical.

FAQ

What is the maximum operating temperature for the SN74LVT245BDWG4?

The SN74LVT245BDWG4 is fully specified for operation from −40°C to +85°C ambient temperature. This range is validated per JEDEC JESD78 latch-up testing and JESD22 ESD stress conditions, ensuring reliable performance in industrial control cabinets, telecom outdoor enclosures, and under-hood automotive environments without thermal derating.

Does the SN74LVT245BDWG4 support hot insertion?

Yes, the SN74LVT245BDWG4 supports hot insertion via two integrated features: I_off circuitry disables outputs when V_CC = 0 V to prevent back-current, and power-up 3-state forces outputs into high-impedance during V_CC ramp-up. These functions are verified per TI's SCES004H datasheet and enable safe live replacement in modular backplane systems.

Can the SN74LVT245BDWG4 interface directly with 5-V logic devices?

Yes, the SN74LVT245BDWG4 accepts 5-V input signals while operating from a 3.3-V V_CC, and its outputs drive 5-V TTL loads. Input voltage range is −0.5 V to 7 V, and VIH is specified at 2.0 V - allowing direct connection to 5-V CMOS or TTL outputs without external level shifters or resistive dividers.

What is the recommended pull-up resistor value for OE on the SN74LVT245BDWG4?

TI recommends tying OE to V_CC through a pull-up resistor to ensure high-impedance state during power-up. The minimum value is determined by the driver's current-sinking capability; for typical applications, a 4.7-kΩ resistor provides sufficient noise margin while limiting current to <1 mA, as confirmed in the SCES004H functional description section.

Is the SN74LVT245BDWG4 RoHS compliant and lead-free?

Yes, the SN74LVT245BDWG4 is RoHS compliant and features NiPdAu (NIPDAU) lead finish. Per TI's Package Option Addendum, it carries "Yes" for RoHS and "Level-1-260C-UNLIM" MSL rating, confirming suitability for standard reflow profiles without moisture sensitivity concerns.

SN74LVT245BDWG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVT

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Discontinued at Digi-Key

Logic Type:: Transceiver, Non-Inverting

Number of Elements:: 1

Number of Bits per Element:: 8

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 32mA, 64mA

Voltage - Supply:: 2.7V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

SN74LVT245BDWG4 FAQ

1.How can I place an order for SN74LVT245BDWG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVT245BDWG4 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 SN74LVT245BDWG4 reliable?

The price and inventory of SN74LVT245BDWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT245BDWG4 is usually 5 days.

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SN74LVT245BDWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVT245BDWG4 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 SN74LVT245BDWG4?

For technical support, including SN74LVT245BDWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT245BDWG4 requirements.

6.How does Aetrix verify that SN74LVT245BDWG4 is sourced from the original manufacturer or authorized distributors?

All SN74LVT245BDWG4 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 SN74LVT245BDWG4 meets industry standards.

7.What is the process for return or replacement of SN74LVT245BDWG4?

All SN74LVT245BDWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT245BDWG4, 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 SN74LVT245BDWG4 part is unused and in its original packaging.

Return procedure for SN74LVT245BDWG4:

1.Submit a request within 90 days.

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

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