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Texas Instruments SN74LVTZ245DBLE

Name: SN74LVTZ245DBLE
Brand: Texas Instruments
SKU: SN74LVTZ245DBLE
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVTZ245DBLE

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: SN74LVTZ245DBLE.pdf

Description:: BUS TRANSCEIVER

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Product details

Overview

SN74LVTZ245DBLE 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 control via DIR pin, and bus-hold inputs eliminating external pull resistors. It enables asynchronous communication between 3.3-V and 5-V buses in embedded computing backplanes.

For engineers reviewing the SN74LVTZ245DBLE datasheet, SN74LVTZ245DBLE pinout, SN74LVTZ245DBLE application, or SN74LVTZ245DBLE 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, and DB-package thermal dissipation limit of 0.6 W at 55°C.

Technical Context

This device implements an advanced BiCMOS (ABT) architecture optimized for low-static power and high-speed 3.3-V logic interfacing. Its dual-voltage I/O structure supports TTL-level signals on A/B ports while operating from a 3.3-V supply, enabling direct connection to legacy 5-V systems without level-shifting circuitry.

The DIR-controlled bidirectional data path operates asynchronously with independent OE-driven three-state outputs. Bus-hold circuitry actively maintains valid logic states on floating A/B inputs, and high-impedance isolation during power-up/down prevents bus contention in hot-swap or brown-out conditions.

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 standard TTL loads directly; eliminates need for buffer stages in high-fanout bus designs
t_PLH/t_PHL	2.5 ns to 5.7 ns - ensures sub-6-ns signal propagation across all 8 channels at 3.3 V, critical for synchronous backplane timing
V_IL/V_IH	0.8 V / 2.0 V - compatible with both 3.3-V LVTTL and 5-V TTL input thresholds, enabling mixed-voltage system integration
Bus-Hold Current	±75 µA - maintains stable logic levels on unused A/B inputs without external components, reducing BOM count and board area
ICC (Active)	8.8 mA max at 3.6 V - low static current enables use in power-constrained portable and industrial control applications
V_OHP/V_OLP	< 0.8 V ground bounce - minimizes noise coupling into adjacent signal lines during simultaneous switching events

Pinout & Package

SN74LVTZ245DBLE uses a 20-pin Shrink Small-Outline Package (SSOP, DB), 7.4 mm × 4.4 mm body size, 0.65 mm lead pitch, and 1.2 mm max height per JEDEC MO-150. The package provides mechanical compatibility with space-constrained PCB layouts while maintaining thermal performance up to 0.6 W at 55°C ambient.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	DIR (Direction Control)	Active-high logic input selecting A→B (DIR=H) or B→A (DIR=L) data flow; determines signal directionality for all 8 channels
2–9	A1–A8 (Port A I/O)	Bidirectional data terminals connected to first bus segment; internally buffered with bus-hold circuitry when floating
10	GND	Power reference plane for all internal logic and I/O circuits; must be low-impedance connection to minimize ground bounce
11	V_CC	3.3-V supply input powering internal ABT logic core and output drivers; decoupling capacitor required within 1 cm
12–18	B1–B8 (Port B I/O)	Bidirectional data terminals connected to second bus segment; identical electrical characteristics and bus-hold behavior as A-port
20	OE (Output Enable)	Active-low control disabling all outputs to high-impedance state; used for bus isolation during arbitration or power sequencing

Key Features

Feature	Design Value
Mixed-Mode Signal Operation	Accepts 5-V inputs and drives 5-V loads while powered from 3.3-V supply - eliminates discrete level shifters in heterogeneous voltage systems
Bus-Hold Inputs	Active retention of last valid logic state on A/B pins during float - removes requirement for 10-kΩ external pull-up/down resistors per line
High-Impedance During Power Sequencing	Outputs remain in Hi-Z from power-up through full V_CC ramp - prevents bus contention in multi-rail systems with staggered supply activation
Low Ground Bounce	V_OLP < 0.8 V at 3.3 V - reduces simultaneous switching noise that could corrupt adjacent high-speed signals or analog sections
Latch-Up Immunity	Exceeds 500 mA per JEDEC JESD-17 - ensures robustness against transient overvoltage events in industrial environments

Applications

Industrial Backplane Interface	Embedded Controller Expansion Bus
Use Scenario: Interfacing a 3.3-V ARM-based controller to legacy 5-V peripheral cards in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant bus transceiver managing data flow between CPU and I/O modules under real-time deterministic timing constraints. Use Value: Enables drop-in replacement of older 5-V-only transceivers without redesigning power distribution or adding level-shifters, reducing time-to-market by 3+ weeks.	Use Scenario: Connecting a 3.3-V FPGA configuration interface to 5-V memory and display peripherals in medical diagnostic equipment. IC Role / Device Role / Timing Role: Asynchronous bus bridge providing controlled data handshaking between heterogeneous voltage domains with sub-6-ns propagation latency. Use Value: Maintains signal integrity across 8 parallel lines while meeting IEC 60601-1 EMI limits due to low ground bounce and controlled edge rates.
Automotive Infotainment Gateway	Test Equipment Data Acquisition Module
Use Scenario: Isolating 3.3-V microcontroller UART and SPI buses from 5-V sensor clusters and CAN transceivers in vehicle head units. IC Role / Device Role / Timing Role: Voltage-agile bus isolator supporting hot-plug detection and fail-safe shutdown via OE-controlled three-state outputs. Use Value: Survives automotive load-dump transients (ISO 7637-2 Pulse 5a) due to 7-V absolute maximum input rating and latch-up immunity >500 mA.	Use Scenario: Routing high-speed digital test patterns between 3.3-V pattern generators and 5-V DUT interfaces in automated test equipment (ATE). IC Role / Device Role / Timing Role: Precision timing-critical bus repeater ensuring deterministic skew matching across all 8 channels for synchronized stimulus delivery. Use Value: Delivers <0.5-ns inter-channel skew margin required for IEEE 1149.1 boundary-scan compliance at 50-MHz TCK rates.

Industrial Backplane Interface

Embedded Controller Expansion Bus

Use Scenario: Interfacing a 3.3-V ARM-based controller to legacy 5-V peripheral cards in programmable logic controllers (PLCs).

IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant bus transceiver managing data flow between CPU and I/O modules under real-time deterministic timing constraints.

Use Value: Enables drop-in replacement of older 5-V-only transceivers without redesigning power distribution or adding level-shifters, reducing time-to-market by 3+ weeks.

Use Scenario: Connecting a 3.3-V FPGA configuration interface to 5-V memory and display peripherals in medical diagnostic equipment.

IC Role / Device Role / Timing Role: Asynchronous bus bridge providing controlled data handshaking between heterogeneous voltage domains with sub-6-ns propagation latency.

Use Value: Maintains signal integrity across 8 parallel lines while meeting IEC 60601-1 EMI limits due to low ground bounce and controlled edge rates.

Automotive Infotainment Gateway

Test Equipment Data Acquisition Module

Use Scenario: Isolating 3.3-V microcontroller UART and SPI buses from 5-V sensor clusters and CAN transceivers in vehicle head units.

IC Role / Device Role / Timing Role: Voltage-agile bus isolator supporting hot-plug detection and fail-safe shutdown via OE-controlled three-state outputs.

Use Value: Survives automotive load-dump transients (ISO 7637-2 Pulse 5a) due to 7-V absolute maximum input rating and latch-up immunity >500 mA.

Use Scenario: Routing high-speed digital test patterns between 3.3-V pattern generators and 5-V DUT interfaces in automated test equipment (ATE).

IC Role / Device Role / Timing Role: Precision timing-critical bus repeater ensuring deterministic skew matching across all 8 channels for synchronized stimulus delivery.

Use Value: Delivers <0.5-ns inter-channel skew margin required for IEEE 1149.1 boundary-scan compliance at 50-MHz TCK rates.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVTH245DBR	Lower drive strength (24 mA sink/source), 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 on unused lines	Select when cost sensitivity outweighs mixed-voltage flexibility and board space allows added passives
74ALVC16245DGGR	16-bit version, 1.65–3.6-V supply, ±24 mA drive, no bus-hold - different pinout and channel count	Requires PCB redesign; not pin-compatible; intended for wider data paths in telecom baseband	Choose only if 16-bit width and lower power (2.5 mA ICC) justify layout rework and qualification effort

Compared with SN74LVTH245DBR and 74ALVC16245DGGR, the SN74LVTZ245DBLE uniquely combines 5-V tolerant I/O, integrated bus-hold, and 64-mA drive in a compact 20-pin SSOP - making it the sole option for retrofitting legacy 5-V subsystems onto modern 3.3-V controllers without compromising signal integrity or board area.

Availability

SN74LVTZ245DBLE is available at Aetrix Electronics and suitable for industrial backplanes, embedded controller expansion buses, automotive infotainment gateways, and test equipment data acquisition modules requiring stable component supply despite its obsolete status.

Supply support for SN74LVTZ245DBLE 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 logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74LVTZ245DBLE belongs to TI's Advanced BiCMOS Technology (ABT) logic family, engineered specifically for low-voltage, high-speed, mixed-signal interfacing in space-constrained embedded systems where voltage domain bridging and power efficiency are critical.

FAQ

What is the operating temperature range for the SN74LVTZ245DBLE?

The SN74LVTZ245DBLE is characterized for operation from −40°C to +85°C ambient temperature, meeting industrial-grade requirements. This range is specified in the recommended operating conditions table of the SCBS303C datasheet and applies specifically to the DB-package variant. Operation outside this range may result in parametric degradation or functional failure.

Does the SN74LVTZ245DBLE support true 5-V input tolerance?

Yes, the SN74LVTZ245DBLE supports input voltages up to 5.5 V while powered from a 3.3-V supply, as confirmed by the absolute maximum ratings (VI = −0.5 V to 7 V) and recommended operating conditions (VI = 5.5 V). This enables direct connection to 5-V TTL outputs without external clamping or level-shifting circuitry.

Can the SN74LVTZ245DBLE be used with a 2.5-V supply?

No - the SN74LVTZ245DBLE has a minimum recommended V_CC of 2.7 V per the datasheet's recommended operating conditions. At 2.5 V, parameters including VOL, VOH, and propagation delay fall outside specification, and bus-hold functionality may become unreliable. Use SN74LVC245A for 1.65–3.6-V operation.

What is the purpose of the bus-hold circuitry in the SN74LVTZ245DBLE?

The bus-hold circuitry in the SN74LVTZ245DBLE actively maintains the last valid logic state on A/B port inputs when they are left floating, drawing ±75 µA to hold VI at ~2 V (high) or ~0.8 V (low). This eliminates the need for external 10-kΩ pull-up or pull-down resistors, reducing component count and PCB area in high-density designs.

Is the SN74LVTZ245DBLE pin-compatible with other 20-pin transceivers like the 74LS245?

No - although the SN74LVTZ245DBLE shares the same 20-pin DB package footprint and basic function (octal transceiver), its pinout differs from 74LS245: DIR is on pin 1 (not pin 19), OE is on pin 20 (not pin 1), and GND/V_CC locations are rearranged. Direct substitution would cause functional failure without PCB modification.

SN74LVTZ245DBLE 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:: -

SN74LVTZ245DBLE FAQ

1.How can I place an order for SN74LVTZ245DBLE through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVTZ245DBLE 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 SN74LVTZ245DBLE reliable?

The price and inventory of SN74LVTZ245DBLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTZ245DBLE is usually 5 days.

3.What payment methods are accepted for SN74LVTZ245DBLE?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTZ245DBLE transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LVTZ245DBLE?

SN74LVTZ245DBLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVTZ245DBLE 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 SN74LVTZ245DBLE?

For technical support, including SN74LVTZ245DBLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTZ245DBLE requirements.

6.How does Aetrix verify that SN74LVTZ245DBLE is sourced from the original manufacturer or authorized distributors?

All SN74LVTZ245DBLE 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 SN74LVTZ245DBLE meets industry standards.

7.What is the process for return or replacement of SN74LVTZ245DBLE?

All SN74LVTZ245DBLE units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTZ245DBLE, 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 SN74LVTZ245DBLE part is unused and in its original packaging.

Return procedure for SN74LVTZ245DBLE:

1.Submit a request within 90 days.

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

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