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

onsemi 74VCX2245WM

Name: 74VCX2245WM
Brand: onsemi
SKU: 74VCX2245WM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VCX2245WM

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74VCX2245WM.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74VCX2245WM from Fairchild Semiconductor is a low-voltage bidirectional transceiver IC with 3-STATE outputs, designed for bus-oriented data transfer between voltage domains. It operates from 1.4V to 3.6V V_CC, supports 3.6V-tolerant I/O on both A and B ports, integrates 26Ω series resistors on all B-port outputs, delivers ≤4.4 ns propagation delay (A→B) at 3.0–3.6V, and is used in memory address drivers and clock distribution networks.

For engineers reviewing the 74VCX2245WM datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional direction control via T/R input, independent 3-STATE enable via active-low OE, asymmetric drive strength (24 mA on A outputs vs. 12 mA on B outputs), and built-in Quiet Series™ noise reduction for EMI-sensitive bus interfaces.

Technical Context

The 74VCX2245WM implements an octal non-inverting bidirectional buffer architecture with dual 3-STATE control: OE disables both A and B ports simultaneously, while T/R selects data flow direction (A→B or B→A). Its CMOS design enables operation across 1.4V–3.6V supply range while maintaining 3.6V I/O tolerance independent of V_CC.

It features asymmetric output drive-A-port outputs support ±24 mA at 3.0–3.6V, whereas B-port outputs are limited to ±12 mA and include integrated 26Ω series resistors to dampen ringing and reduce dynamic switching noise. The device supports live insertion and withdrawal when OE is pulled up to V_CC during power transitions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.4V to 3.6V - Enables interoperability between 1.8V, 2.5V, and 3.3V logic domains without level shifters.
I/O Voltage Tolerance	Up to 3.6V - Allows safe connection to higher-voltage buses even when V_CC = 1.4V.
A-Port Output Drive	±24 mA at V_CC = 3.0–3.6V - Sufficient to drive multiple loads or longer traces on high-speed buses.
B-Port Output Drive	±12 mA at V_CC = 3.0–3.6V with 26Ω series resistance - Reduces edge-induced EMI and overshoot on sensitive signal lines.
Propagation Delay (A→B)	≤4.4 ns max at V_CC = 3.0–3.6V, CL = 30 pF - Supports >200 MHz bus timing in compact layouts.
Power-Off High-Z	Inputs/outputs enter high-impedance state when V_CC = 0V - Prevents back-driving and bus contention during hot-swap events.
ESD Rating	HBM ≥2000V, MM ≥200V - Meets industrial-grade robustness requirements for board-level handling.

Pinout & Package

74VCX2245WM is housed in a 20-lead SOIC package (JEDEC MS-013, 0.300" wide, package code M20B), with 1.27 mm pitch and standard gull-wing leads suitable for reflow soldering.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Active-low output enable	Drives both A and B ports into high-impedance state when HIGH; must be pulled up for safe power-up sequencing.
2–9 (A0–A7)	Side-A bidirectional I/O	Non-inverting data path; supports full drive strength (±24 mA) and no series resistance.
10 (GND)	Ground reference	Primary return path for all internal logic and I/O current; requires low-inductance PCB connection.
11–18 (B0–B7)	Side-B bidirectional I/O	Non-inverting data path with integrated 26Ω series resistors; optimized for noise-sensitive transmission.
19 (T/R)	Transmit/receive direction control	LOW = B→A data flow; HIGH = A→B data flow; determines source/sink roles per port pair.
20 (V_CC)	Power supply	Supplies core logic and I/O buffers; bypass capacitor required near pin for stable high-speed operation.

Key Features

Feature	Design Value
Quiet Series™ noise reduction	Integrated circuitry reduces dynamic output voltage spikes (VOLP/VOLV) by up to 50% versus standard VCX devices, lowering radiated EMI in dense PCB layouts.
Asymmetric port drive	A-port delivers higher current (±24 mA) for driving heavy loads or long traces; B-port uses lower drive (±12 mA) + 26Ω resistors to suppress reflections on stubbed or unterminated lines.
3.6V-tolerant I/O	Allows direct interfacing with legacy 3.3V or mixed-voltage systems without external clamping diodes or level translators.
Live insertion support	Power-off high-impedance behavior and controlled enable sequencing permit hot-plug operation in modular backplane or card-edge applications.

Applications

Memory Address Bus Driver	Low-Noise Clock Distribution
Use Scenario: Driving address lines from a 1.8V microcontroller to a 3.3V SRAM or Flash memory device. IC Role / Device Role / Timing Role: Bidirectional transceiver enabling voltage-domain translation and bus isolation during read/write cycles. Use Value: Eliminates need for discrete level shifters while maintaining <4.4 ns propagation delay and preventing bus contention via 3-STATE control.	Use Scenario: Distributing a 3.3V system clock to multiple 1.8V peripherals with minimal jitter and overshoot. IC Role / Device Role / Timing Role: Unidirectional clock buffer (T/R fixed HIGH) using B-port outputs with 26Ω series termination. Use Value: Integrated 26Ω resistors suppress edge ringing and reduce peak-to-peak noise (VOLP ≤1.0 V at 3.3V), improving clock signal integrity.
Hot-Swappable Module Interface	Industrial Control Backplane
Use Scenario: Interfacing a field-replaceable I/O module to a main controller board during live system operation. IC Role / Device Role / Timing Role: Bidirectional data bridge with automatic high-Z behavior during power loss or insertion. Use Value: Power-off high-impedance inputs/outputs prevent back-driving and ensure safe hot-swap compliance without external circuitry.	Use Scenario: Isolating and translating control signals between 2.5V PLC logic and 3.3V sensor interface cards on a shared backplane. IC Role / Device Role / Timing Role: Voltage-tolerant bus transceiver managing multi-drop communication with direction arbitration. Use Value: 3.6V I/O tolerance accommodates supply variations and transient spikes common in industrial environments.

Memory Address Bus Driver

Low-Noise Clock Distribution

Use Scenario: Driving address lines from a 1.8V microcontroller to a 3.3V SRAM or Flash memory device.

IC Role / Device Role / Timing Role: Bidirectional transceiver enabling voltage-domain translation and bus isolation during read/write cycles.

Use Value: Eliminates need for discrete level shifters while maintaining <4.4 ns propagation delay and preventing bus contention via 3-STATE control.

Use Scenario: Distributing a 3.3V system clock to multiple 1.8V peripherals with minimal jitter and overshoot.

IC Role / Device Role / Timing Role: Unidirectional clock buffer (T/R fixed HIGH) using B-port outputs with 26Ω series termination.

Use Value: Integrated 26Ω resistors suppress edge ringing and reduce peak-to-peak noise (VOLP ≤1.0 V at 3.3V), improving clock signal integrity.

Hot-Swappable Module Interface

Industrial Control Backplane

Use Scenario: Interfacing a field-replaceable I/O module to a main controller board during live system operation.

IC Role / Device Role / Timing Role: Bidirectional data bridge with automatic high-Z behavior during power loss or insertion.

Use Value: Power-off high-impedance inputs/outputs prevent back-driving and ensure safe hot-swap compliance without external circuitry.

Use Scenario: Isolating and translating control signals between 2.5V PLC logic and 3.3V sensor interface cards on a shared backplane.

IC Role / Device Role / Timing Role: Voltage-tolerant bus transceiver managing multi-drop communication with direction arbitration.

Use Value: 3.6V I/O tolerance accommodates supply variations and transient spikes common in 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
74LVC2245ADTR2G	No integrated series resistors on B outputs; 32 mA A-port drive; same 1.65–3.6V V_CC range.	Lacks built-in noise suppression; requires external termination for EMI-critical clock lines.	Select when maximum drive strength is prioritized over inherent EMI reduction.
SN74AVC2245RGYR	Higher speed (t_PD ≤2.8 ns); 1.2–3.6V V_CC; no B-port series resistors; different pinout (VQFN).	Not drop-in compatible; lacks Quiet Series™ noise mitigation; better suited for ultra-high-speed data paths.	Select when sub-3 ns propagation is mandatory and board layout allows redesign for VQFN package.

Compared with 74LVC2245ADTR2G and SN74AVC2245RGYR, the 74VCX2245WM uniquely combines 26Ω B-port series resistance, 3.6V I/O tolerance at 1.4V V_CC, and Quiet Series™ noise suppression-making it optimal for cost-sensitive, EMI-constrained bus interfaces where layout simplicity and signal integrity outweigh raw speed.

Availability

74VCX2245WM is available at Aetrix Electronics and suitable for memory address drivers, low-noise clock distribution networks, hot-swappable module interfaces, and industrial control backplanes requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for 74VCX2245WM 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 analog and power IC manufacturer acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing systems.

The VCX logic family targets low-voltage, high-speed bus interface applications with emphasis on voltage-domain bridging, noise immunity, and hot-swap capability-designed specifically for embedded controllers, memory subsystems, and modular electronics.

FAQ

What is the function of the T/R pin on the 74VCX2245WM?

The T/R (Transmit/Receive) pin on the 74VCX2245WM controls data direction: when LOW, data flows from B-port to A-port; when HIGH, data flows from A-port to B-port. This bidirectional control is essential for shared-bus architectures like memory data buses or peripheral interconnects. The 74VCX2245WM relies on this pin to dynamically reverse signal flow without external logic, making it ideal for flexible, reconfigurable interfaces.

Does the 74VCX2245WM support live insertion and removal?

Yes, the 74VCX2245WM supports live insertion and removal due to its power-off high-impedance behavior: when V_CC = 0V, both A and B ports enter a high-impedance state, preventing back-driving or bus contention. To ensure safe sequencing, OE must be tied to V_CC via a pull-up resistor during power transitions. This feature makes the 74VCX2245WM suitable for modular systems such as pluggable I/O cards and field-upgradeable hardware.

What is the purpose of the 26Ω series resistors on the B outputs of the 74VCX2245WM?

The 26Ω series resistors on the B outputs of the 74VCX2245WM are integrated to dampen signal edge ringing, reduce electromagnetic interference (EMI), and improve signal integrity on unterminated or stubbed transmission lines. They lower dynamic output voltage peaks (VOLP) by up to 50% compared to resistor-less variants, which is critical in clock distribution and high-density PCB routing. This eliminates the need for external series termination components, simplifying layout and reducing BOM count for the 74VCX2245WM.

Can the 74VCX2245WM operate with a 1.4V supply voltage?

Yes, the 74VCX2245WM is fully specified to operate down to 1.4V V_CC, supporting ultra-low-power applications such as battery-backed subsystems and energy-efficient embedded controllers. At 1.4V, it maintains 3.6V I/O tolerance and delivers ≥1 mA output drive on B outputs and ≥2 mA on A outputs. Its advanced CMOS process ensures stable logic thresholds and reliable 3-STATE behavior across the entire 1.4V–3.6V range-confirming true low-voltage compatibility for the 74VCX2245WM.

How does the 74VCX2245WM differ from standard 74VC2245 devices?

The 74VCX2245WM differs from standard 74VC2245 devices by incorporating Quiet Series™ noise reduction circuitry, 26Ω series resistors on all B-port outputs, and enhanced 3.6V I/O tolerance at minimum V_CC (1.4V). Standard VC2245 variants lack integrated termination and EMI suppression, resulting in higher VOLP/VOLV peaks and greater susceptibility to crosstalk. These enhancements make the 74VCX2245WM uniquely suited for noise-sensitive applications where signal fidelity matters more than marginal speed gains.

74VCX2245WM Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74VCX

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

Packaging:: Tube

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; 12mA, 12mA

Voltage - Supply:: 1.4V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

74VCX2245WM FAQ

1.How can I place an order for 74VCX2245WM through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VCX2245WM 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 74VCX2245WM reliable?

The price and inventory of 74VCX2245WM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCX2245WM is usually 5 days.

3.What payment methods are accepted for 74VCX2245WM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCX2245WM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VCX2245WM?

74VCX2245WM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VCX2245WM 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 74VCX2245WM?

For technical support, including 74VCX2245WM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCX2245WM requirements.

6.How does Aetrix verify that 74VCX2245WM is sourced from the original manufacturer or authorized distributors?

All 74VCX2245WM 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 74VCX2245WM meets industry standards.

7.What is the process for return or replacement of 74VCX2245WM?

All 74VCX2245WM units undergo pre-shipment inspection (PSI). If there is an issue with 74VCX2245WM, 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 74VCX2245WM part is unused and in its original packaging.

Return procedure for 74VCX2245WM:

1.Submit a request within 90 days.

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

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