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

onsemi 74LCXZ245WMX

Name: 74LCXZ245WMX
Brand: onsemi
SKU: 74LCXZ245WMX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LCXZ245WMX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74LCXZ245WMX.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74LCXZ245WMX from Fairchild Semiconductor is a low-voltage, bidirectional 8-bit transceiver with 5V-tolerant I/O, designed for bus interfacing between 2.5V/3.3V systems and 5V logic domains. It features 3-STATE outputs, direction control via T/R input, output enable (OE), 7.0 ns max propagation delay at 3.3V, and ±24 mA drive strength at 3.0V - enabling robust signal translation in mixed-voltage memory and peripheral buses.

For engineers reviewing the 74LCXZ245WMX datasheet, pinout, applications, or equivalent options, key selection considerations include its 2.3–3.6V V_CC range, power-down high-impedance behavior below 1.5V, live-insertion support, ESD ratings (2000V HBM), and JEDEC MS-013 SOIC-20W package compatibility.

Technical Context

The 74LCXZ245WMX implements non-inverting bidirectional buffering with independent OE and T/R control logic, allowing dynamic data flow arbitration between two asynchronous buses. Its CMOS design ensures rail-to-rail 5V-tolerant I/O operation while maintaining sub-10 ns propagation delay and low ICC (225 µA quiescent) across 2.3–3.6V supply range.

It integrates patented noise/EMI reduction circuitry and guarantees latch-up immunity >500 mA. During power-up/down (V_CC < 1.5V), all I/Os enter high-impedance state automatically - eliminating bus contention without external biasing, critical for hot-swap and system-level power sequencing.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2.3 V to 3.6 V - supports dual-supply 2.5V and 3.3V system rails with guaranteed timing and drive
t_PD Max	7.0 ns at V_CC = 3.3V - enables reliable operation in high-speed address/data bus applications up to ~100 MHz
I_OH/I_OL	±24 mA at V_CC = 3.0V - drives standard TTL loads and multiple CMOS inputs without external buffers
5V Tolerance	Inputs/outputs withstand 0–5.5 V - allows direct connection to legacy 5V peripherals without level-shifting components
Power-Down Z-State	Automatic high-impedance below V_CC = 1.5V - prevents bus glitches during power ramping or brownout conditions
ESD Rating	2000 V HBM - meets industrial handling requirements without additional protection circuitry

Pinout & Package

74LCXZ245WMX is housed in a 20-lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" wide (Package Number M20B), with standard pin pitch of 1.27 mm and body width of 7.5 mm.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Output Enable Input	Active-low global control: disables both A and B ports into high-impedance when HIGH
2 (A0)	Port A Bidirectional I/O	Connects to local bus; direction determined by T/R; 5V-tolerant
3 (A1)	Port A Bidirectional I/O	Same electrical and timing behavior as A0; supports 8-bit parallel transfer
4–9 (A2–A7)	Port A Bidirectional I/O	Complete 8-bit A-side interface; all pins share identical 5V tolerance and drive specs
10 (GND)	Ground Reference	Primary return path for V_CC and I/O currents; must be low-inductance connection
11 (B0)	Port B Bidirectional I/O	Connects to remote bus; data flows A→B when T/R = HIGH, B→A when T/R = LOW
12–17 (B1–B7)	Port B Bidirectional I/O	Full 8-bit B-side interface; electrically matched to A-side for balanced bus loading
18 (V_CC)	Supply Voltage	2.3–3.6 V only; powers internal logic and output drivers; decoupling required
19 (T/R)	Transmit/Receive Control	Direction select: HIGH = A→B, LOW = B→A; sampled synchronously with OE
20 (B7)	Port B Bidirectional I/O	Last bit of B port; same AC/DC characteristics as other Bn pins

Key Features

Feature	Design Value
5V-tolerant I/O	Enables direct interconnection with 5V logic without external level shifters or voltage translators
Live insertion support	Guaranteed high-impedance state during power transitions eliminates bus contention during hot-plug operations
Patented noise/EMI reduction	Reduces switching noise and radiated emissions in dense PCB layouts with fast edge rates
Low ICC quiescent current	225 µA typical at 2.3–3.6V - minimizes standby power in battery-backed or energy-sensitive systems
Latch-up immunity >500 mA	Ensures robust operation under transient overvoltage or ESD stress without destructive failure

Applications

PCI Bus Interface	Memory Expansion Module
Use Scenario: Interfacing a 3.3V PCI controller to legacy 5V add-in cards in industrial PC backplanes. IC Role / Device Role / Timing Role: Bidirectional voltage-translating transceiver managing address/data strobe handshaking between mismatched voltage domains. Use Value: Eliminates need for discrete level shifters while maintaining PCI timing compliance via 7.0 ns t_PD and controlled slew rate.	Use Scenario: Adding external SRAM or Flash to a 2.5V microcontroller-based embedded system with 5V-compatible peripherals. IC Role / Device Role / Timing Role: Isolating and translating 8-bit data/address lines between MCU and memory module during read/write cycles. Use Value: ±24 mA drive supports fan-out to multiple memory devices; 5V tolerance accommodates mixed-voltage memory chips.
Hot-Swappable I/O Card	Industrial PLC Backplane
Use Scenario: Enabling safe insertion/removal of field I/O modules in programmable logic controllers without powering down the main rack. IC Role / Device Role / Timing Role: Providing controlled bus isolation and direction arbitration during power-up sequencing of modular hardware. Use Value: Automatic high-Z on V_CC < 1.5V prevents back-driving; live-insertion support verified per Note 1 in datasheet.	Use Scenario: Connecting distributed 3.3V sensor interface boards to a central 5V backplane in factory automation systems. IC Role / Device Role / Timing Role: Serving as a fault-isolated, bidirectional data bridge between isolated voltage domains on multi-board chassis. Use Value: Latch-up immunity >500 mA and 2000V HBM ESD rating ensure reliability in electrically noisy industrial environments.

PCI Bus Interface

Memory Expansion Module

Use Scenario: Interfacing a 3.3V PCI controller to legacy 5V add-in cards in industrial PC backplanes.

IC Role / Device Role / Timing Role: Bidirectional voltage-translating transceiver managing address/data strobe handshaking between mismatched voltage domains.

Use Value: Eliminates need for discrete level shifters while maintaining PCI timing compliance via 7.0 ns t_PD and controlled slew rate.

Use Scenario: Adding external SRAM or Flash to a 2.5V microcontroller-based embedded system with 5V-compatible peripherals.

IC Role / Device Role / Timing Role: Isolating and translating 8-bit data/address lines between MCU and memory module during read/write cycles.

Use Value: ±24 mA drive supports fan-out to multiple memory devices; 5V tolerance accommodates mixed-voltage memory chips.

Hot-Swappable I/O Card

Industrial PLC Backplane

Use Scenario: Enabling safe insertion/removal of field I/O modules in programmable logic controllers without powering down the main rack.

IC Role / Device Role / Timing Role: Providing controlled bus isolation and direction arbitration during power-up sequencing of modular hardware.

Use Value: Automatic high-Z on V_CC < 1.5V prevents back-driving; live-insertion support verified per Note 1 in datasheet.

Use Scenario: Connecting distributed 3.3V sensor interface boards to a central 5V backplane in factory automation systems.

IC Role / Device Role / Timing Role: Serving as a fault-isolated, bidirectional data bridge between isolated voltage domains on multi-board chassis.

Use Value: Latch-up immunity >500 mA and 2000V HBM ESD rating ensure reliability in electrically noisy industrial environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC245APW,118 (Nexperia)	3.3V-only V_CC (1.65–3.6V); no 5V tolerance on inputs; 6.7 ns t_PD max at 3.3V	Requires external clamping or level-shifting for 5V signals; not suitable for direct 5V bus interfacing	Select when interfacing only 3.3V/2.5V systems and lower propagation delay is prioritized
SN74AVC245DBR (Texas Instruments)	1.2–3.6V V_CC; 5V-tolerant I/O; 5.8 ns t_PD max; supports 12 mA drive at 1.8V	Better low-voltage scalability but smaller drive at 3.0V (12 mA vs. 24 mA); different pinout (TSSOP-20)	Prefer for ultra-low-voltage designs or where tighter timing margin is needed, accepting reduced drive capability

Compared with 74LCXZ245WMX, the Nexperia part lacks 5V tolerance and requires external protection, while the TI part offers faster timing and broader V_CC range but delivers only half the output drive at 3.0V - making 74LCXZ245WMX optimal for 3.3V systems needing robust 5V interoperability and high-current bus driving.

Availability

74LCXZ245WMX is available at Aetrix Electronics and suitable for PCI bus interfaces, memory expansion modules, hot-swappable I/O cards, and industrial PLC backplanes requiring stable component supply and long-term obsolescence management.

Supply support for 74LCXZ245WMX 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and logic ICs before its acquisition by ON Semiconductor in 2016. Its logic portfolio emphasized high-speed, low-voltage, and mixed-signal interoperability.

The 74LCXZ245WMX belongs to the LCX family of advanced CMOS logic devices, engineered specifically for low-voltage bus interfacing with 5V tolerance - targeting industrial computing, telecom infrastructure, and embedded control systems where voltage domain bridging is essential.

FAQ

What is the maximum operating voltage for 74LCXZ245WMX V_CC?

The 74LCXZ245WMX is rated for V_CC between 2.3 V and 3.6 V under recommended operating conditions. Operation outside this range - including at 5V - is not permitted for the supply pin. However, its inputs and outputs are fully 5V tolerant (0–5.5 V), allowing safe connection to 5V signal lines while powered from 3.3V or 2.5V rails. This dual-voltage capability is central to the 74LCXZ245WMX design.

Does 74LCXZ245WMX support hot-plug or live insertion?

Yes, the 74LCXZ245WMX supports live insertion and withdrawal as documented in the datasheet (Note 1). When V_CC is between 0 V and 1.5 V - such as during power-up or power-down - all I/Os automatically enter a high-impedance state. This prevents bus contention and signal corruption. For guaranteed behavior, OE should be tied to V_CC via a pull-up resistor, as specified in the 74LCXZ245WMX application guidance.

What is the output drive capability of 74LCXZ245WMX at 3.0V V_CC?

At V_CC = 3.0 V, the 74LCXZ245WMX delivers ±24 mA output current per I/O pin in HIGH or LOW state, as specified in the DC Electrical Characteristics table. This drive strength supports fan-out to multiple TTL or CMOS loads and ensures reliable signal integrity across loaded PCB traces - a key performance advantage of the 74LCXZ245WMX over lower-drive alternatives.

How does the T/R pin control data direction in 74LCXZ245WMX?

The T/R (Transmit/Receive) input determines bidirectional data flow: when T/R = HIGH, data passes from Port A to Port B; when T/R = LOW, data flows from Port B to Port A. This control operates independently of OE but is only active when OE = LOW. The 74LCXZ245WMX truth table confirms that OE takes precedence - if OE = HIGH, both ports go high-impedance regardless of T/R state.

Is 74LCXZ245WMX RoHS compliant and lead-free?

Yes, the 74LCXZ245WMX is Pb-Free and complies with JEDEC J-STD-020B reflow standards. The "WM" suffix denotes the SOIC-20W package (M20B), and the "X" suffix indicates tape-and-reel packaging. Fairchild's documentation explicitly states Pb-Free status for this ordering code, confirming full RoHS compliance for use in environmentally regulated industrial and commercial applications.

74LCXZ245WMX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LCXZ

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:: 2.7V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

74LCXZ245WMX FAQ

1.How can I place an order for 74LCXZ245WMX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCXZ245WMX 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 74LCXZ245WMX reliable?

The price and inventory of 74LCXZ245WMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCXZ245WMX is usually 5 days.

3.What payment methods are accepted for 74LCXZ245WMX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCXZ245WMX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LCXZ245WMX?

74LCXZ245WMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCXZ245WMX 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 74LCXZ245WMX?

For technical support, including 74LCXZ245WMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCXZ245WMX requirements.

6.How does Aetrix verify that 74LCXZ245WMX is sourced from the original manufacturer or authorized distributors?

All 74LCXZ245WMX 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 74LCXZ245WMX meets industry standards.

7.What is the process for return or replacement of 74LCXZ245WMX?

All 74LCXZ245WMX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCXZ245WMX, 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 74LCXZ245WMX part is unused and in its original packaging.

Return procedure for 74LCXZ245WMX:

1.Submit a request within 90 days.

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

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