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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

STMicroelectronics 74LVC245AMTR

Name: 74LVC245AMTR
Brand: STMicroelectronics
SKU: 74LVC245AMTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVC245AMTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74LVC245AMTR.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:4,016

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Product details

Overview

74LVC245AMTR from STMicroelectronics is a low-voltage CMOS octal bus transceiver (3-state, non-inverting) with directional control (DIR) and output enable (G), operating from 1.65 V to 3.6 V. It delivers symmetrical drive strength (±24 mA at VCC = 3.0 V), 6.3 ns max propagation delay at 3 V, and 5V-tolerant inputs - ideal for bidirectional level-shifting between 1.8 V/2.5 V/3.3 V buses in embedded I/O expansion.

For engineers reviewing the 74LVC245AMTR datasheet, 74LVC245AMTR pinout, 74LVC245AMTR application, or 74LVC245AMTR equivalent, key selection criteria include bus isolation capability, high-speed 3.3 V operation with sub-7 ns timing, 3-state output control logic, and compatibility with legacy 74-series footprint and function.

Technical Context

The device implements asynchronous bidirectional data flow between two 8-bit buses (A and B), controlled by DIR (data direction) and G (output enable). All 16 I/Os are 5V-tolerant regardless of VCC, enabling safe interfacing with higher-voltage peripherals without external clamping.

It features balanced tPLH/tPHL propagation delays, power-down protection on all I/Os during VCC = 0 V, and latch-up immunity >500 mA per JESD17. ESD robustness exceeds 2 kV HBM and 200 V MM, supporting reliable operation in noisy industrial environments.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Operating Range	1.65 V to 3.6 V - supports mixed-voltage system interconnect (e.g., 1.8 V MCU ↔ 3.3 V peripheral)
Max Propagation Delay	6.3 ns at VCC = 3.0 V, CL = 50 pF - enables ≥100 MHz bus toggle rates in synchronous designs
Output Drive Strength	±24 mA at VCC = 3.0 V - drives standard TTL loads and multiple CMOS inputs without buffering
Input Voltage Tolerance	0 V to 5.5 V - allows direct connection to 5 V logic without level shifters or resistors
3-State Enable/Disable Time	tPZH = 8.5 ns, tPHZ = 7.5 ns (max) at VCC = 3.0 V - ensures fast bus arbitration and glitch-free switching
Quiescent Supply Current	10 µA max at VCC = 3.6 V - minimizes standby power in battery-backed or always-on subsystems
ESD Rating	HBM > 2000 V, MM > 200 V - meets industrial handling and board-level ESD requirements

Pinout & Package

74LVC245AMTR is supplied in a 20-pin SOIC (Small Outline Integrated Circuit) package, 7.6 mm wide, with 1.27 mm pitch and tape-and-reel packaging (MTR suffix). Pin 1 is marked with a notch or dot; pin numbering follows standard SO-20 convention.

Pin/Terminal	Circuit Role	Design Meaning
1	DIR	Direction control input: LOW = A→B, HIGH = B→A; determines data flow path for all 8 channels
2–9	A1–A8	Bus A side I/Os - bidirectional data terminals connected to local processor or controller bus
11–18	B1–B8	Bus B side I/Os - bidirectional data terminals connected to peripheral, memory, or expansion bus
19	G	Active-low output enable: LOW = transceiver enabled, HIGH = all outputs in high-impedance state
10	GND	Digital ground reference - must be low-inductance connection to system ground plane
20	VCC	Positive supply - decoupling capacitor (100 nF ceramic) required within 5 mm of this pin

Key Features

Feature	Design Value
5V-tolerant inputs	Supports direct interface to 5 V logic while powered from 1.65–3.6 V - eliminates external voltage translators
Symmetrical output drive	\|IOH\| = \|IOL\| = 24 mA min at VCC = 3.0 V - ensures matched rise/fall times and reduced signal skew
Power-down I/O protection	Inputs and outputs remain high-impedance and non-latching when VCC = 0 V - prevents back-driving of powered systems
Pin- and function-compatible with 74-series 245	Drop-in replacement for legacy 74LS245/74HC245 in space-constrained upgrades - same pinout and truth table
Low dynamic power consumption	CPD = 34 pF at VCC = 3.3 V - reduces ICC(opr) in high-frequency bus applications versus older LVT families

Applications

Industrial PLC I/O Expansion

Embedded MCU Peripheral Interface

Use Scenario: Adding isolated digital I/O channels to a 3.3 V ARM-based PLC controller via parallel bus extension.

IC Role / Device Role / Timing Role: Bidirectional bus transceiver enabling real-time read/write access to remote I/O registers over a 20 cm PCB trace.

Use Value: 6.3 ns propagation delay and ±24 mA drive ensure deterministic response under 100 kHz scan cycles with no external buffering.

Use Scenario: Interfacing a 1.8 V FPGA configuration bus to a 3.3 V EEPROM holding boot firmware.

IC Role / Device Role / Timing Role: Level-shifting transceiver managing data flow direction during FPGA-initiated read operations only.

Use Value: 5 V-tolerant inputs accept 3.3 V EEPROM outputs safely; DIR tied LOW eliminates need for FPGA GPIO control.

Automotive Body Control Module

Test Equipment Digital Pattern Generator

Use Scenario: Isolating microcontroller GPIOs from CAN transceiver auxiliary control lines subject to load dump transients.

IC Role / Device Role / Timing Role: Direction-controlled buffer isolating MCU pins during power sequencing and fault recovery phases.

Use Value: Power-down protection prevents back-current into MCU when VCC is off; latch-up immunity >500 mA withstands ISO 7637-2 pulse 5a.

Use Scenario: Driving multiple DUT (device-under-test) inputs simultaneously from a single pattern generator channel bank.

IC Role / Device Role / Timing Role: Output-enabled bus driver synchronizing 8-bit stimulus vectors across test fixtures with minimal skew.

Use Value: tOSLH/tOSHL < 1 ns ensures simultaneous edge alignment across all 8 outputs - critical for setup/hold timing validation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC245APW	TSSOP-20 package (4.4 mm width); identical electrical specs and pinout	Better thermal performance and PCB area efficiency in dense layouts; requires finer-pitch reflow profile	Select for space-constrained boards where SOIC footprint is prohibitive
74ALVC245MTCX	Faster tPD = 3.5 ns (typ) at 3.3 V; lower ICC but reduced noise margin (VIH = 2.0 V min)	Higher-speed bus bridging (e.g., DDR clock domains); less tolerant of slow-rising signals or long traces	Select when propagation delay is critical and signal integrity is tightly controlled

Compared with SN74LVC245APW and 74ALVC245MTCX, the 74LVC245AMTR offers optimal balance of speed, drive strength, and robustness in standard SOIC packaging - making it preferred for industrial and automotive applications requiring proven reliability and ease of assembly.

Availability

74LVC245AMTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, embedded MCU peripheral interface, and automotive body control modules requiring stable component supply across multi-year production cycles.

Supply support for 74LVC245AMTR 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, Switzerland, delivering innovative silicon solutions for automotive, industrial, and consumer markets since 1987.

The 74LVC family was designed specifically for low-voltage, high-speed logic interfacing in mixed-signal embedded systems - emphasizing 5V tolerance, rail-to-rail operation, and JEDEC-compliant robustness.

FAQ

What is the maximum recommended capacitive load for 74LVC245AMTR?

The datasheet specifies AC timing (tPLH/tPHL) under CL = 50 pF test conditions at VCC = 3.0–3.6 V. While not an absolute limit, sustained operation above 75 pF may degrade propagation delay and increase output transition time beyond guaranteed specs - use series termination or reduce trace length if driving heavier loads.

Can 74LVC245AMTR operate with VCC = 1.2 V?

No - the absolute minimum operating VCC is 1.65 V per Table 5. At 1.2 V, the device retains data (data retention mode) but does not function as a transceiver; inputs will not switch reliably, and outputs cannot drive specified currents. Use only within 1.65–3.6 V for active operation.

Is the DIR pin 5V-tolerant?

Yes - all inputs including DIR and G are 5V-tolerant (VI = 0 to 5.5 V), meaning they accept 0–5 V logic levels regardless of VCC setting. This allows DIR to be driven directly from a 5 V microcontroller GPIO even when VCC = 1.8 V.

How should unused I/O pins be handled?

Unused A/B pins must be tied HIGH or LOW via pull-up/pull-down resistors (10–100 kΩ); floating I/Os in high-impedance state can cause increased ICC and unpredictable switching due to noise coupling. Never leave any A1–A8 or B1–B8 pins unconnected.

74LVC245AMTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74LVC

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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:: 24mA, 24mA

Voltage - Supply:: 1.65V ~ 3.6V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

74LVC245AMTR FAQ

1.How can I place an order for 74LVC245AMTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVC245AMTR 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 74LVC245AMTR reliable?

The price and inventory of 74LVC245AMTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVC245AMTR is usually 5 days.

3.What payment methods are accepted for 74LVC245AMTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVC245AMTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LVC245AMTR?

74LVC245AMTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVC245AMTR 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 74LVC245AMTR?

For technical support, including 74LVC245AMTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVC245AMTR requirements.

6.How does Aetrix verify that 74LVC245AMTR is sourced from the original manufacturer or authorized distributors?

All 74LVC245AMTR 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 74LVC245AMTR meets industry standards.

7.What is the process for return or replacement of 74LVC245AMTR?

All 74LVC245AMTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVC245AMTR, 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 74LVC245AMTR part is unused and in its original packaging.

Return procedure for 74LVC245AMTR:

1.Submit a request within 90 days.

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

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