Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

onsemi 74VCXH245WM

Name: 74VCXH245WM
Brand: onsemi
SKU: 74VCXH245WM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 74VCXH245WM

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74VCXH245WM.pdf

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

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,163

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

74VCXH245WM from Fairchild Semiconductor is a low-voltage bidirectional transceiver with bushold inputs, designed for bus interface applications between mixed-voltage domains. It operates from 1.2V to 3.6V V_CC, delivers ±24 mA drive at 3.0V, achieves 3.5 ns max propagation delay (3.0–3.6V), and features active bushold on all data inputs to eliminate external pull-up resistors - used in 3.3V/2.5V/1.8V system interconnects.

For engineers reviewing the 74VCXH245WM datasheet, pinout, applications, or equivalent options, this page provides verified electrical specs, SOIC-20 package mapping, bushold behavior validation, direction-control timing, and real-world bus isolation use cases - not generic logic IC summaries.

Technical Context

The 74VCXH245WM implements eight non-inverting bidirectional buffers with independent 3-STATE control via OE (active-low) and directional control via T/R. Its bushold circuitry actively maintains valid logic levels on floating A0–A7 and B0–B7 inputs without external biasing, reducing board space and BOM count.

It uses Fairchild's patented Quiet Series™ noise/EMI reduction architecture, achieving <0.5 ns output skew and dynamic VOL/VOH suppression under 30 pF load. Latchup immunity exceeds 300 mA, and ESD rating meets 2000V HBM per JEDEC JESD22-A114.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.2V to 3.6V - supports interoperability across 1.2V, 1.8V, 2.5V, and 3.3V logic families without level shifters.
t_PD Max	3.5 ns @ 3.0–3.6V - enables high-speed data transfer on local buses up to ~200 MHz clock-equivalent rates.
I_OH/I_OL	±24 mA @ 3.0V - drives standard CMOS loads with margin for fanout >10 and trace capacitance up to 30 pF.
Bushold Current	75 µA min @ V_IN = 0.8V/2.0V (3.0V V_CC) - reliably holds unused inputs at valid logic states without resistor networks.
3-STATE Leakage	±10 µA max - ensures minimal current draw and signal integrity during bus contention or power-down modes.
Operating Temp	–40°C to +85°C - qualified for industrial temperature operation in embedded controllers and communications equipment.

Pinout & Package

74VCXH245WM is housed in a 20-lead SOIC package (JEDEC MS-013, 0.300" wide, Package Number M20B), with 1.27 mm pitch and gull-wing leads suitable for surface-mount reflow assembly.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Output Enable Input	Active-low global control: asserts 3-STATE on both A and B ports when HIGH; must be pulled LOW to enable data flow.
2 (T/R)	Transmit/Receive Control	Determines direction: LOW routes B→A, HIGH routes A→B; no internal pull-up/pull-down - requires external bias.
3–10 (A0–A7)	Side A I/O with Bushold	Bidirectional data port with integrated bushold - floats to last valid state if unconnected, eliminating pull resistors.
11 (GND)	Ground Reference	Primary return path for V_CC supply and I/O currents; must be low-impedance connection to minimize noise coupling.
12–19 (B0–B7)	Side B I/O with Bushold	Second bidirectional port, electrically identical to A-side; supports symmetric bus arbitration or asymmetric domain bridging.
20 (V_CC)	Power Supply	Single-supply input for entire device; decoupling capacitor (0.1 µF ceramic) required within 5 mm of this pin.

Key Features

Feature	Design Value
Bushold Inputs	Eliminates need for 16 external pull-up resistors on A/B ports - reduces PCB area, BOM cost, and layout complexity.
Quiet Series™ Noise Reduction	Reduces simultaneous switching noise (SSN) and EMI emissions by controlling edge rate and output transient behavior.
Low-Voltage Operation	1.2V minimum V_CC enables direct interfacing with advanced microcontrollers and FPGAs using sub-1.8V I/O standards.
High Drive Strength	±24 mA output capability ensures robust signal integrity across longer traces or higher-capacitance loads in compact systems.
Latchup Immunity	Exceeds 300 mA per JEDEC JESD78 - prevents destructive latchup during hot-swap or voltage-ramp conditions.

Applications

Memory Interface Bridge	Processor-to-Peripheral Bus
Use Scenario: Connecting a 3.3V FPGA memory controller to a 1.8V LPDDR2 SDRAM subsystem where voltage translation is required. IC Role / Device Role / Timing Role: Bidirectional data transceiver managing read/write data flow direction via T/R, with OE synchronized to memory access strobes. Use Value: Bushold prevents floating DQ lines during idle cycles, while 3.5 ns t_PD supports DDR timing margins without added delay.	Use Scenario: Interfacing an ARM Cortex-M7 MCU (3.3V I/O) to a 2.5V sensor hub ASIC in an industrial IoT gateway. IC Role / Device Role / Timing Role: Voltage-domain translator enabling synchronous parallel data exchange between mismatched logic families. Use Value: Eliminates need for discrete level-shifters and pull resistors, reducing component count and improving signal reliability.
Hot-Swappable Module Interface	Legacy Bus Isolation
Use Scenario: Hot-plug expansion slot in a modular PLC backplane where modules may power up/down asynchronously. IC Role / Device Role / Timing Role: Isolates module-side signals from main bus during insertion/removal using OE-controlled 3-STATE. Use Value: ±24 mA drive and 300 mA latchup immunity prevent damage during live insertion; bushold avoids glitches on unpowered side.	Use Scenario: Adding a modern low-voltage microcontroller to an existing 5V ISA bus design without redesigning legacy peripherals. IC Role / Device Role / Timing Role: Bidirectional buffer isolating 3.3V CPU address/data lines from 5V bus drivers using OE gating. Use Value: 1.2V–3.6V operation allows safe interfacing to 3.3V core logic while maintaining compatibility with 5V-tolerant bus receivers.

Memory Interface Bridge

Processor-to-Peripheral Bus

Use Scenario: Connecting a 3.3V FPGA memory controller to a 1.8V LPDDR2 SDRAM subsystem where voltage translation is required.

IC Role / Device Role / Timing Role: Bidirectional data transceiver managing read/write data flow direction via T/R, with OE synchronized to memory access strobes.

Use Value: Bushold prevents floating DQ lines during idle cycles, while 3.5 ns t_PD supports DDR timing margins without added delay.

Use Scenario: Interfacing an ARM Cortex-M7 MCU (3.3V I/O) to a 2.5V sensor hub ASIC in an industrial IoT gateway.

IC Role / Device Role / Timing Role: Voltage-domain translator enabling synchronous parallel data exchange between mismatched logic families.

Use Value: Eliminates need for discrete level-shifters and pull resistors, reducing component count and improving signal reliability.

Hot-Swappable Module Interface

Legacy Bus Isolation

Use Scenario: Hot-plug expansion slot in a modular PLC backplane where modules may power up/down asynchronously.

IC Role / Device Role / Timing Role: Isolates module-side signals from main bus during insertion/removal using OE-controlled 3-STATE.

Use Value: ±24 mA drive and 300 mA latchup immunity prevent damage during live insertion; bushold avoids glitches on unpowered side.

Use Scenario: Adding a modern low-voltage microcontroller to an existing 5V ISA bus design without redesigning legacy peripherals.

IC Role / Device Role / Timing Role: Bidirectional buffer isolating 3.3V CPU address/data lines from 5V bus drivers using OE gating.

Use Value: 1.2V–3.6V operation allows safe interfacing to 3.3V core logic while maintaining compatibility with 5V-tolerant bus receivers.

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-up resistors on all inputs; 1.65V–3.6V V_CC; 3.7 ns t_PD @ 3.3V.	Suitable where board space permits discrete biasing and lower drive (±24 mA same) is acceptable.	Choose when bushold is unnecessary and TI's qualification profile aligns with program requirements.
74ALVC245MTCX	Higher speed (2.8 ns t_PD), no bushold, 1.65V–3.6V range, TSSOP-20 only; lower ICC but no Quiet Series™ EMI control.	Better for high-frequency data paths where noise sensitivity is low and layout allows tighter routing.	Select when propagation delay is critical and EMI mitigation is handled elsewhere in system design.

Compared with SN74LVC245APWR and 74ALVC245MTCX, the 74VCXH245WM uniquely combines bushold functionality, Quiet Series™ noise suppression, and full 1.2V support - making it optimal for space-constrained, mixed-voltage, noise-sensitive industrial interfaces where input floating must be avoided.

Availability

74VCXH245WM is available at Aetrix Electronics and suitable for industrial automation controllers, embedded communication gateways, and low-power sensor hubs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for 74VCXH245WM 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 low-voltage, high-speed, and noise-optimized solutions.

The 74VCXH245WM belongs to Fairchild's VCXH logic family, engineered specifically for mixed-voltage bus bridging in portable, industrial, and telecom equipment where bushold and EMI control were critical design constraints.

FAQ

What is the minimum V_CC voltage supported by the 74VCXH245WM?

The 74VCXH245WM supports operation down to 1.2V V_CC, as specified in the Recommended Operating Conditions table. At 1.2V, output drive drops to ±100 µA, and propagation delay increases to 42.0 ns (CL = 30 pF). This enables compatibility with ultra-low-power microcontrollers and battery-operated systems where 1.2V core logic is used.

Does the 74VCXH245WM require external pull-up resistors on its data inputs?

No - the 74VCXH245WM includes active bushold circuitry on all A0–A7 and B0–B7 inputs, which maintains the last valid logic state when inputs float. This eliminates the need for external pull-up or pull-down resistors, reducing BOM count and PCB footprint. Bushold current is specified at 75 µA minimum at 3.0V V_CC.

What is the function of the T/R and OE pins on the 74VCXH245WM?

On the 74VCXH245WM, OE (pin 1) is an active-low global output enable: when HIGH, both A and B ports enter high-impedance 3-STATE. T/R (pin 2) controls data direction: LOW enables B→A transfer, HIGH enables A→B transfer. Both pins are CMOS-compatible and require defined logic levels - neither has internal pull-up or pull-down.

Is the 74VCXH245WM pin-compatible with other 20-pin transceivers like the 74LVC245?

No - while the 74VCXH245WM and 74LVC245 share the same 20-pin SOIC package outline, their pinouts differ. Specifically, the 74VCXH245WM places OE on pin 1 and T/R on pin 2, whereas the 74LVC245 places OE on pin 19 and T/R on pin 1. Direct replacement would require PCB layout modification.

What does "Quiet Series™" mean for the 74VCXH245WM?

Quiet Series™ is Fairchild's proprietary noise/EMI reduction technology implemented in the 74VCXH245WM. It controls output edge rates and transient behavior to minimize simultaneous switching noise (SSN), reducing radiated emissions and ground bounce. This is confirmed by measured VOLP/VOLV/VOHV values across V_CC ranges in the AC Electrical Characteristics table.

74VCXH245WM Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74VCXH

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

Voltage - Supply:: 1.2V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

74VCXH245WM FAQ

1.How can I place an order for 74VCXH245WM through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VCXH245WM 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 74VCXH245WM reliable?

The price and inventory of 74VCXH245WM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VCXH245WM is usually 5 days.

3.What payment methods are accepted for 74VCXH245WM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VCXH245WM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VCXH245WM?

74VCXH245WM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VCXH245WM 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 74VCXH245WM?

For technical support, including 74VCXH245WM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VCXH245WM requirements.

6.How does Aetrix verify that 74VCXH245WM is sourced from the original manufacturer or authorized distributors?

All 74VCXH245WM 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 74VCXH245WM meets industry standards.

7.What is the process for return or replacement of 74VCXH245WM?

All 74VCXH245WM units undergo pre-shipment inspection (PSI). If there is an issue with 74VCXH245WM, 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 74VCXH245WM part is unused and in its original packaging.

Return procedure for 74VCXH245WM:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…