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

onsemi 74VCXH245WMX

Name: 74VCXH245WMX
Brand: onsemi
SKU: 74VCXH245WMX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VCXH245WMX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74VCXH245WMX.pdf

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

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Product details

Overview

74VCXH245WMX from Fairchild Semiconductor is a low-voltage, bidirectional 8-bit transceiver with bushold inputs and 3-STATE outputs, designed for bus interface applications between mixed-voltage domains. It operates from 1.2V to 3.6V V_CC, delivers ≤3.5 ns propagation delay at 3.0–3.6V, supports ±24 mA drive strength at 3.0V, and eliminates external pull-up resistors via integrated bushold circuitry on all data inputs.

For engineers reviewing the 74VCXH245WMX datasheet, pinout, applications, or equivalent options, key selection criteria include voltage translation capability (1.2V ↔ 3.6V), direction control via T/R input, OE-gated 3-STATE operation, bushold-enabled floating-input robustness, and Quiet Series™ EMI reduction for noise-sensitive digital systems.

Technical Context

The 74VCXH245WMX implements non-inverting bidirectional data transfer between two 8-bit buses (A0–A7 and B0–B7) using a single active-low Output Enable (OE) and a Transmit/Receive (T/R) control signal to define data flow direction. Its bushold circuitry actively maintains valid logic levels on unused A/B inputs without external biasing.

It employs advanced CMOS fabrication for high-speed operation with low static power consumption, features patented Quiet Series™ noise suppression, and meets latchup immunity >300 mA and ESD ratings of 2000V (HBM) / 200V (MM). Absolute max V_CC is 4.6V, but recommended operating range is strictly 1.2V–3.6V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.2V to 3.6V - Enables interoperability across 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains
t_PD Max	3.5 ns at V_CC = 3.0–3.6V, CL = 30 pF - Supports high-speed bus timing in DDR, memory expansion, and FPGA I/O bridging
I_OH/I_OL	±24 mA at V_CC = 3.0V - Drives standard TTL loads and multiple CMOS inputs without buffering
Bushold Current	Min 75 µA at V_CC = 3.0V, VIN = 0.8V/2.0V - Actively holds floating inputs at valid logic levels, removing need for 10-kΩ pull-ups
3-STATE Leakage	≤10 µA at V_CC = 1.2–3.6V - Ensures minimal current draw and signal integrity during bus isolation
ESD Rating	2000V HBM, 200V MM - Provides robust handling margin during PCB assembly and system integration
Operating Temp	–40°C to +85°C - Qualified for industrial temperature environments without derating

Pinout & Package

74VCXH245WMX is packaged in a 20-lead SOIC (JEDEC MS-013, 0.300" wide, Package Number M20B), with 1.27 mm pitch and surface-mount footprint.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Active-low Output Enable	Disables both A and B ports simultaneously into high-impedance state when HIGH
2 (A0)	Side A Data Terminal	Bushold input or 3-STATE output; direction determined by T/R and OE states
3 (A1)	Side A Data Terminal	Same function as A0; all A0–A7 share identical bushold and 3-STATE behavior
4 (A2)	Side A Data Terminal	Supports full 8-bit parallel bidirectional data path on Side A
5 (A3)	Side A Data Terminal	No internal pull-up required due to active bushold circuitry
6 (A4)	Side A Data Terminal	Valid logic level maintained even when left unconnected or floating
7 (A5)	Side A Data Terminal	Compatible with 1.2V–3.6V input thresholds per V_IL/V_IH specs
8 (A6)	Side A Data Terminal	Drives up to ±24 mA when active and V_CC ≥ 3.0V
9 (A7)	Side A Data Terminal	Final bit of Side A bus; shares same timing and noise characteristics as other A pins
10 (GND)	Ground Reference	Primary return path for all I/O and supply currents; must be low-impedance
11 (B7)	Side B Data Terminal	Bushold input or 3-STATE output; mirrors A7 functionality across bus boundary
12 (B6)	Side B Data Terminal	Full 8-bit Side B port; direction controlled by T/R relative to OE state
13 (B5)	Side B Data Terminal	Supports bidirectional flow: A→B when T/R = HIGH, B→A when T/R = LOW
14 (B4)	Side B Data Terminal	Quiet Series™ design minimizes simultaneous switching noise during transitions
15 (B3)	Side B Data Terminal	Output disable time t_PLZ/t_PHZ ≤ 3.6 ns at 3.3V - critical for glitch-free bus arbitration
16 (B2)	Side B Data Terminal	Input leakage ≤5.0 µA ensures compatibility with high-impedance microcontroller GPIO
17 (B1)	Side B Data Terminal	Capacitance C_I/O = 7 pF - limits trace-length impact in high-speed routing
18 (B0)	Side B Data Terminal	First bit of Side B bus; matches A0 timing and DC characteristics exactly
19 (T/R)	Direction Control Input	LOW = data flows B→A; HIGH = data flows A→B; no internal pull-up
20 (V_CC)	Power Supply	Single-supply rail supporting 1.2V–3.6V; decoupling capacitor required per layout guidelines

Key Features

Feature	Design Value
Bushold Inputs	Actively holds all 16 data terminals (A0–A7, B0–B7) at valid logic levels without external resistors, reducing BOM count and board space
Wide V_CC Range	1.2V to 3.6V operation enables direct interfacing between legacy 3.3V systems and modern ultra-low-voltage FPGAs or ASICs
Quiet Series™ EMI Reduction	Patented output driver design lowers dynamic noise and ground bounce, easing EMC compliance in dense PCB layouts
Low Propagation Delay	3.5 ns max at 3.3V allows use in sub-100 MHz synchronous bus designs without timing closure issues
High Drive Strength	±24 mA output current at 3.0V supports fanout to 10+ CMOS loads or direct driving of 50-Ω transmission lines

Applications

Memory Expansion Interface	FPGA-to-Microcontroller Bridge
Use Scenario: Expanding external SRAM or Flash memory on a 3.3V microcontroller while interfacing with a 1.8V FPGA controller. IC Role / Device Role / Timing Role: Bidirectional voltage-translating transceiver managing data/address bus handshaking between mismatched logic families. Use Value: Eliminates discrete level shifters and pull-up networks, reduces layout complexity, and maintains <3.5 ns timing margin across V_CC = 1.8V/3.3V domains.	Use Scenario: Connecting an FPGA I/O bank configured for 1.2V LVCMOS to a 2.5V sensor interface MCU over a shared 8-bit parallel bus. IC Role / Device Role / Timing Role: Direction-controlled bus buffer enabling real-time sensor data streaming and command feedback without voltage clamping diodes. Use Value: Bushold prevents floating inputs during FPGA configuration phase; Quiet Series™ suppresses switching noise that could corrupt analog sensor readings.
Industrial PLC Backplane Bus	Legacy Peripheral Adapter
Use Scenario: Interfacing multiple 3.3V I/O modules to a 2.5V main controller in a programmable logic controller rack system. IC Role / Device Role / Timing Role: Isolatable bidirectional transceiver providing hot-swap-safe bus segmentation and direction arbitration via T/R control. Use Value: 3-STATE disable time ≤3.6 ns ensures glitch-free bus release during module insertion/removal; latchup immunity >300 mA enhances field reliability.	Use Scenario: Adapting a legacy 5V parallel printer port to a modern 1.8V SoC-based embedded host using level translation and bus direction management. IC Role / Device Role / Timing Role: Voltage-tolerant transceiver converting 5V-signaled handshaking (BUSY, ACK) to 1.8V logic while maintaining bidirectional data flow. Use Value: Input voltage rating up to 4.6V allows safe 5V-tolerant operation on B-side inputs; bushold secures idle lines during printer power-down sequences.

Memory Expansion Interface

FPGA-to-Microcontroller Bridge

Use Scenario: Expanding external SRAM or Flash memory on a 3.3V microcontroller while interfacing with a 1.8V FPGA controller.

IC Role / Device Role / Timing Role: Bidirectional voltage-translating transceiver managing data/address bus handshaking between mismatched logic families.

Use Value: Eliminates discrete level shifters and pull-up networks, reduces layout complexity, and maintains <3.5 ns timing margin across V_CC = 1.8V/3.3V domains.

Use Scenario: Connecting an FPGA I/O bank configured for 1.2V LVCMOS to a 2.5V sensor interface MCU over a shared 8-bit parallel bus.

IC Role / Device Role / Timing Role: Direction-controlled bus buffer enabling real-time sensor data streaming and command feedback without voltage clamping diodes.

Use Value: Bushold prevents floating inputs during FPGA configuration phase; Quiet Series™ suppresses switching noise that could corrupt analog sensor readings.

Industrial PLC Backplane Bus

Legacy Peripheral Adapter

Use Scenario: Interfacing multiple 3.3V I/O modules to a 2.5V main controller in a programmable logic controller rack system.

IC Role / Device Role / Timing Role: Isolatable bidirectional transceiver providing hot-swap-safe bus segmentation and direction arbitration via T/R control.

Use Value: 3-STATE disable time ≤3.6 ns ensures glitch-free bus release during module insertion/removal; latchup immunity >300 mA enhances field reliability.

Use Scenario: Adapting a legacy 5V parallel printer port to a modern 1.8V SoC-based embedded host using level translation and bus direction management.

IC Role / Device Role / Timing Role: Voltage-tolerant transceiver converting 5V-signaled handshaking (BUSY, ACK) to 1.8V logic while maintaining bidirectional data flow.

Use Value: Input voltage rating up to 4.6V allows safe 5V-tolerant operation on B-side inputs; bushold secures idle lines during printer power-down sequences.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC245APWR	No bushold; requires external pull-ups on unused inputs; V_CC range 1.65V–3.6V; t_PD = 3.9 ns max at 3.3V	Lacks floating-input robustness; suitable only where all inputs are actively driven	Select when bushold is unnecessary and cost sensitivity outweighs design-for-reliability requirements
74ALVC245MTCX	Bushold included; V_CC range 1.65V–3.6V; t_PD = 2.9 ns max at 3.3V; higher drive (±24 mA same), but narrower low-voltage support than 74VCXH245WMX	Cannot operate below 1.65V - unsuitable for 1.2V/1.5V systems requiring full VCXH compatibility	Choose for speed-critical 1.8V/2.5V/3.3V designs where 1.2V operation is not required

Compared with SN74LVC245APWR and 74ALVC245MTCX, the 74VCXH245WMX uniquely supports 1.2V operation and integrates bushold across its full 16-pin I/O set - making it the only option for robust, resistorless interfacing in ultra-low-voltage industrial and battery-powered systems.

Availability

74VCXH245WMX is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA-to-peripheral bridges, memory expansion subsystems, and legacy interface adapters requiring stable component supply and long-term obsolescence management.

Supply support for 74VCXH245WMX 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 leading designer and manufacturer of high-performance analog and power ICs, acquired by ON Semiconductor in 2016. Its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.

The 74VCXH245WMX belongs to Fairchild's VCXH ultra-low-voltage logic family, engineered specifically for mixed-voltage bus interfacing in space-constrained, noise-sensitive, and power-optimized embedded systems.

FAQ

What voltage levels does the 74VCXH245WMX support on its I/O pins?

The 74VCXH245WMX supports input voltages from –0.5V to V_CC + 0.5V, with absolute maximum ratings up to 4.6V. Its data inputs tolerate 5V signals when V_CC = 3.3V, enabling safe interfacing with legacy 5V peripherals on the B-side. All I/Os maintain bushold functionality across the full 1.2V–3.6V V_CC range, and the 74VCXH245WMX datasheet confirms VIH/VIL thresholds scale with V_CC down to 1.2V.

How does bushold work on the 74VCXH245WMX, and what design benefit does it provide?

Bushold on the 74VCXH245WMX uses internal feedback circuitry to actively hold unused or floating A0–A7 and B0–B7 inputs at their last-valid logic state, drawing ≤75 µA at 3.0V. This eliminates the need for external 10-kΩ pull-up/down resistors, reducing BOM cost, PCB area, and potential signal integrity issues from resistor parasitics - a key advantage confirmed in Fairchild's DS500198 datasheet for the 74VCXH245WMX.

Can the 74VCXH245WMX be used for unidirectional data transfer?

Yes - the 74VCXH245WMX supports unidirectional operation by fixing the T/R input to either HIGH (A→B only) or LOW (B→A only), while using OE to enable/disable the entire transceiver. Its truth table and logic diagram in the official datasheet confirm this mode is fully supported, and the 74VCXH245WMX maintains identical timing and drive specifications in unidirectional configurations.

What is the maximum capacitive load the 74VCXH245WMX can drive while maintaining specified timing?

The 74VCXH245WMX AC specifications are guaranteed for C_L = 30 pF and R_L = 500 Ω. At 3.3V, t_PD ≤ 3.5 ns and t_PZL/t_PLZ ≤ 4.5 ns/3.6 ns under those conditions. For C_L = 50 pF, Fairchild specifies adding ~300 ps to each AC parameter - meaning the 74VCXH245WMX remains functional up to ~50 pF, though timing margins shrink accordingly.

Is the 74VCXH245WMX pin-compatible with other 20-pin SOIC transceivers like the 74LVC245?

No - while the 74VCXH245WMX and 74LVC245 share the same 20-pin SOIC package (M20B), their pinouts differ: OE is on Pin 1 for the 74VCXH245WMX but on Pin 19 for standard 74LVC245 variants. The 74VCXH245WMX places T/R on Pin 19 and GND on Pin 10, whereas 74LVC245 uses Pin 1 for V_CC and Pin 20 for GND. Direct replacement requires PCB redesign.

74VCXH245WMX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74VCXH

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:: 1.2V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

74VCXH245WMX FAQ

1.How can I place an order for 74VCXH245WMX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VCXH245WMX 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 74VCXH245WMX reliable?

The price and inventory of 74VCXH245WMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCXH245WMX is usually 5 days.

3.What payment methods are accepted for 74VCXH245WMX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCXH245WMX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VCXH245WMX?

74VCXH245WMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VCXH245WMX 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 74VCXH245WMX?

For technical support, including 74VCXH245WMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCXH245WMX requirements.

6.How does Aetrix verify that 74VCXH245WMX is sourced from the original manufacturer or authorized distributors?

All 74VCXH245WMX 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 74VCXH245WMX meets industry standards.

7.What is the process for return or replacement of 74VCXH245WMX?

All 74VCXH245WMX units undergo pre-shipment inspection (PSI). If there is an issue with 74VCXH245WMX, 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 74VCXH245WMX part is unused and in its original packaging.

Return procedure for 74VCXH245WMX:

1.Submit a request within 90 days.

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

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