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 74LCXH245WMX

Name: 74LCXH245WMX
Brand: onsemi
SKU: 74LCXH245WMX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 74LCXH245WMX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74LCXH245WMX.pdf

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

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,400

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

Product details

Overview

74LCXH245WMX from ON Semiconductor is a low-voltage bidirectional transceiver with bushold inputs, designed for 2.3V–3.6V bus interface applications. It features 8-bit non-inverting data flow control via T/R input, 3-STATE outputs enabled/disabled by OE, ±24 mA drive at 3.0V, and 7.0 ns max propagation delay at VCC = 3.3V. Used in voltage-level translated memory/data buses between mixed-supply subsystems.

For engineers reviewing the 74LCXH245WMX datasheet, pinout, applications, or equivalent options, key selection criteria include 5V-tolerant control inputs, bushold-enabled floating-input immunity, 20-pin SOIC (M20B) package compatibility, and AC/DC performance under −40°C to +85°C industrial temperature range.

Technical Context

The 74LCXH245WMX implements an advanced CMOS-based bidirectional bus transceiver architecture with integrated bushold circuitry on all A0–A7 and B0–B7 I/O pins, eliminating external pull resistors for unused inputs. Its direction control logic uses a single T/R signal, while OE independently places both ports into high-impedance state.

It supports dual-supply domain interfacing: 5V-tolerant OE and T/R inputs allow direct connection to legacy 5V control logic, while core operation remains within 2.3V–3.6V VCC range. Propagation delay skew is limited to 1.0 ns across outputs, ensuring timing integrity in synchronous parallel bus systems.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	2.3V–3.6V operating supply - enables interoperability with 2.5V and 3.3V logic domains without level shifters.
Propagation Delay	7.0 ns max at VCC = 3.3V, CL = 50 pF - ensures sub-140 MHz bus timing margin for high-speed data transfer.
Output Drive	±24 mA at VCC = 3.0V - supports driving 50 Ω transmission lines or multiple CMOS loads without buffering.
Bushold Current	±45 µA min at VIN = 0.7V/1.7V (VCC = 2.3V) - actively holds floating inputs at valid logic levels, preventing metastability.
Input Tolerance	5V tolerant on OE and T/R - allows direct interface with 5V microcontrollers or FPGAs without external voltage translation.
ESD Rating	Human Body Model > 2000V - provides robust handling margin during board assembly and system integration.
Operating Temp	−40°C to +85°C - qualified for industrial-grade embedded and automotive under-hood auxiliary systems.

Pinout & Package

74LCXH245WMX is packaged in a 20-lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" wide (Package Number M20B). The body dimensions are 12.80 mm × 7.50 mm × 2.65 mm (L × W × H), with 1.27 mm lead pitch and gull-wing leads.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Output Enable Input	Active-low global enable: drives both A and B ports into high-impedance when HIGH; must be pulled LOW for bidirectional operation.
2 (A0)	Side A I/O with Bushold	Bidirectional data terminal for Bus A; bushold maintains last-valid logic state if left floating during 3-STATE transitions.
3 (A1)	Side A I/O with Bushold	Same function as A0; all A0–A7 pins share identical bushold and drive characteristics.
4 (A2)	Side A I/O with Bushold	Enables 8-bit parallel data latching on Side A without external hold circuitry.
5 (A3)	Side A I/O with Bushold	Supports hot-swap-capable bus arbitration when used with controlled OE/T/R sequencing.
6 (A4)	Side A I/O with Bushold	Valid logic retention during power sequencing or partial system reset events.
7 (A5)	Side A I/O with Bushold	Reduces PCB component count by replacing eight discrete pull-up resistors.
8 (A6)	Side A I/O with Bushold	Ensures deterministic startup behavior in systems with uncontrolled I/O float conditions.
9 (A7)	Side A I/O with Bushold	Completes 8-bit A-side port; pairs with B0–B7 for full bidirectional data exchange.
10 (GND)	Ground Reference	Primary ground return path for all internal logic and I/O circuits; requires low-inductance layout connection.
11 (B7)	Side B I/O with Bushold	Bidirectional data terminal for Bus B; electrically symmetrical to A7 with matched timing and drive strength.
12 (B6)	Side B I/O with Bushold	Matches A6 functionality; supports simultaneous 8-bit data transfer in either direction.
13 (B5)	Side B I/O with Bushold	Enables full-duplex bus isolation when OE is asserted during direction changes.
14 (B4)	Side B I/O with Bushold	Provides noise-immune data coupling between disparate voltage domains (e.g., 2.5V FPGA ↔ 3.3V ASIC).
15 (B3)	Side B I/O with Bushold	Validated for use in DDR memory address/control buffers where signal integrity and timing predictability are critical.
16 (B2)	Side B I/O with Bushold	Supports glitch-free bus turnaround via synchronized T/R and OE edge alignment per truth table.
17 (B1)	Side B I/O with Bushold	Enables dynamic bus sharing in multi-master systems with software-controlled direction arbitration.
18 (B0)	Side B I/O with Bushold	Completes B-side port; matches A0 timing specs (tPHL/tPLH ≤ 7.0 ns @ 3.3V).
19 (VCC)	Power Supply	2.3V–3.6V core supply input; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin.
20 (T/R)	Transmit/Receive Control	Direction select: LOW routes B→A, HIGH routes A→B; 5V-tolerant, sampled synchronously with OE.

Key Features

Feature	Design Value
Bushold Inputs	Eliminates need for 16 external pull-up/pull-down resistors on A0–A7 and B0–B7, reducing BOM cost and PCB area by ~12 mm².
5V-Tolerant Control	OE and T/R accept 0–5.5V input voltages, enabling direct interface with legacy 5V controllers without level-shifting circuitry.
Low-Power CMOS	10 µA max ICC quiescent current at VCC = 3.3V ensures minimal standby power draw in battery-backed systems.
Noise/EMI Reduction	Patented output slew-rate control limits di/dt, reducing radiated emissions and crosstalk in dense routing environments.
Latch-Up Immunity	Exceeds 500 mA per JEDEC JESD78, ensuring robustness against transient overvoltage and ESD-induced latch-up.

Applications

Memory Interface Buffering	Industrial PLC Backplane
Use Scenario: Interfacing a 2.5V FPGA memory controller to a 3.3V SDRAM module with shared address/data bus. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing data flow direction and voltage domain isolation. Use Value: Enables seamless 8-bit parallel data transfer with 7.0 ns propagation delay and no external biasing components.	Use Scenario: Connecting modular I/O cards to a central 3.3V CPU backplane in programmable logic controller chassis. IC Role / Device Role / Timing Role: Hot-swap-capable bus isolator providing direction-controlled data coupling between distributed modules. Use Value: Bushold prevents floating-bus faults during card insertion/removal; 5V-tolerant controls simplify master-side design.
Automotive Infotainment Gateway	Test Equipment Signal Routing
Use Scenario: Bridging CAN controller (3.3V) and display processor (2.5V) in vehicle head unit data path. IC Role / Device Role / Timing Role: Voltage-agile bidirectional data conduit with deterministic timing and ESD-hardened I/O. Use Value: −40°C to +85°C rating and >2000V HBM ESD withstand ensure reliability in automotive cabin environments.	Use Scenario: Reconfigurable signal path switching in automated test equipment requiring precise 8-bit data routing. IC Role / Device Role / Timing Role: Programmable bus direction controller synchronized to test pattern generator clock edges. Use Value: Sub-1 ns output skew and 1.5 ns min enable/disable times support high-throughput digital pattern validation.

Memory Interface Buffering

Industrial PLC Backplane

Use Scenario: Interfacing a 2.5V FPGA memory controller to a 3.3V SDRAM module with shared address/data bus.

IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing data flow direction and voltage domain isolation.

Use Value: Enables seamless 8-bit parallel data transfer with 7.0 ns propagation delay and no external biasing components.

Use Scenario: Connecting modular I/O cards to a central 3.3V CPU backplane in programmable logic controller chassis.

IC Role / Device Role / Timing Role: Hot-swap-capable bus isolator providing direction-controlled data coupling between distributed modules.

Use Value: Bushold prevents floating-bus faults during card insertion/removal; 5V-tolerant controls simplify master-side design.

Automotive Infotainment Gateway

Test Equipment Signal Routing

Use Scenario: Bridging CAN controller (3.3V) and display processor (2.5V) in vehicle head unit data path.

IC Role / Device Role / Timing Role: Voltage-agile bidirectional data conduit with deterministic timing and ESD-hardened I/O.

Use Value: −40°C to +85°C rating and >2000V HBM ESD withstand ensure reliability in automotive cabin environments.

Use Scenario: Reconfigurable signal path switching in automated test equipment requiring precise 8-bit data routing.

IC Role / Device Role / Timing Role: Programmable bus direction controller synchronized to test pattern generator clock edges.

Use Value: Sub-1 ns output skew and 1.5 ns min enable/disable times support high-throughput digital pattern validation.

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 resistors on all I/O; 1.65V–3.6V VCC range; slightly lower drive (±24 mA @ 3.3V same, but weaker at 2.5V).	Lacks floating-input immunity; unsuitable for hot-plug or partial-power-down scenarios without added circuitry.	Select when bushold is unnecessary and cost-per-pin optimization is prioritized over design simplicity.
74ALVC16245PAG	16-bit version in 48-pin TSSOP; higher pin count and board space; same bushold and 5V-tolerant control features.	Targets wider data buses (e.g., 16-bit microprocessor local bus); not drop-in compatible due to pin count and package mismatch.	Choose for systems scaling beyond 8-bit width where layout reuse of bushold architecture is beneficial.

Compared with SN74LVC245APWR and 74ALVC16245PAG, the 74LCXH245WMX uniquely combines 8-bit width, SOIC-20 packaging, bushold-enabled robustness, and 5V-tolerant control in a single industrial-qualified device-making it optimal for space-constrained, mixed-voltage embedded interfaces requiring zero-external-bias operation.

Availability

74LCXH245WMX is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive infotainment gateways, memory interface buffering, and automated test equipment signal routing requiring stable component supply and long-term lifecycle assurance.

Supply support for 74LCXH245WMX 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensor, and logic solutions for automotive, industrial, cloud computing, and consumer markets.

The 74LCXH245WMX belongs to the LCX family of low-voltage CMOS logic devices, engineered specifically for mixed-supply system interfacing with emphasis on noise immunity, bushold stability, and industrial temperature resilience.

FAQ

What is the maximum propagation delay of the 74LCXH245WMX at 3.3V supply?

The 74LCXH245WMX has a maximum propagation delay of 7.0 ns at VCC = 3.3V ± 0.3V, CL = 50 pF, and TA = −40°C to +85°C. This value applies to both tPHL and tPLH transitions between any A/B pair, ensuring predictable timing in high-speed parallel bus designs. The 74LCXH245WMX meets this spec across its full industrial temperature range without derating.

Does the 74LCXH245WMX require external pull-up resistors on its I/O pins?

No, the 74LCXH245WMX does not require external pull-up or pull-down resistors on A0–A7 or B0–B7 due to integrated bushold circuitry. This feature actively maintains the last-valid logic state on floating inputs, eliminating risk of undefined states during power-up, hot-swap, or tri-state transitions. The 74LCXH245WMX achieves this with ±45 µA minimum bushold current at VCC = 2.3V.

Is the 74LCXH245WMX compatible with 5V control signals?

Yes, the 74LCXH245WMX accepts 0–5.5V input voltages on OE and T/R control pins, making it fully compatible with 5V microcontrollers, CPLDs, or FPGAs. These inputs remain functional even when VCC is as low as 2.3V, enabling robust interfacing between legacy 5V logic and modern low-voltage buses. The 74LCXH245WMX specifies this 5V tolerance explicitly in its Absolute Maximum Ratings and Recommended Operating Conditions.

What package type is used for the 74LCXH245WMX?

The 74LCXH245WMX uses a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide (Package Number M20B). Its dimensions are 12.80 mm × 7.50 mm × 2.65 mm with 1.27 mm lead pitch. This surface-mount package is widely supported by automated assembly lines and offers thermal and mechanical reliability for industrial applications. The 74LCXH245WMX suffix "X" denotes tape-and-reel packaging for SMT production.

What is the operating temperature range for the 74LCXH245WMX?

The 74LCXH245WMX is rated for free-air operating temperatures from −40°C to +85°C, qualifying it for industrial-grade deployment. This range is validated across all DC and AC electrical specifications including propagation delay, output drive, bushold current, and leakage parameters. The 74LCXH245WMX maintains full functionality without derating throughout this span, supporting use in harsh environments such as factory automation and automotive under-dash systems.

74LCXH245WMX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74LCXH

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:: 2V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

74LCXH245WMX FAQ

1.How can I place an order for 74LCXH245WMX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LCXH245WMX 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 74LCXH245WMX reliable?

The price and inventory of 74LCXH245WMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCXH245WMX is usually 5 days.

3.What payment methods are accepted for 74LCXH245WMX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCXH245WMX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LCXH245WMX?

74LCXH245WMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LCXH245WMX 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 74LCXH245WMX?

For technical support, including 74LCXH245WMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCXH245WMX requirements.

6.How does Aetrix verify that 74LCXH245WMX is sourced from the original manufacturer or authorized distributors?

All 74LCXH245WMX 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 74LCXH245WMX meets industry standards.

7.What is the process for return or replacement of 74LCXH245WMX?

All 74LCXH245WMX units undergo pre-shipment inspection (PSI). If there is an issue with 74LCXH245WMX, 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 74LCXH245WMX part is unused and in its original packaging.

Return procedure for 74LCXH245WMX:

1.Submit a request within 90 days.

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

Tech Hub

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…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…