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

onsemi 74ALVCH245WM

Name: 74ALVCH245WM
Brand: onsemi
SKU: 74ALVCH245WM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74ALVCH245WM

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74ALVCH245WM.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74ALVCH245WM from Fairchild Semiconductor is a low-voltage, bidirectional 8-bit transceiver with bushold inputs and 3-STATE outputs, designed for bus interface applications between 1.65V and 3.6V V_CC. It features direction control via T/R, output enable via active-low OE, and eliminates external pull-up resistors on data lines A0–A7 and B0–B7.

For engineers reviewing the 74ALVCH245WM datasheet, pinout, applications, or equivalent options, key selection considerations include propagation delay (≤3.6 ns at 3.3V), bushold input current (±75 µA at 3.0V), 20-pin SOIC package, JEDEC MS-013 compliance, and −40°C to +85°C operating temperature range.

Technical Context

The 74ALVCH245WM implements non-inverting bidirectional data transfer between two 8-bit buses using a single T/R control signal and shared 3-STATE output logic. Its bushold circuitry actively maintains valid logic levels on floating A/B port inputs without external biasing.

It operates across three V_CC ranges-1.65–1.95V, 2.3–2.7V, and 2.7–3.6V-with corresponding VIH/VIL thresholds and drive strength scaling. Propagation delay, output enable/disable times, and leakage are all specified per voltage band and load condition (CL = 30/50 pF).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65V to 3.6V - supports mixed-voltage system interfacing including 1.8V, 2.5V, and 3.3V domains
t_PD Max	3.6 ns at V_CC = 3.3V - enables high-speed data transfer in memory or peripheral buses
IOH/IOL	±24 mA at V_CC = 3.0V - drives standard CMOS loads with margin for fan-out and trace capacitance
Bushold Current	±75 µA at VIN = 0.8V/2.0V, V_CC = 3.0V - sustains stable logic state on unconnected inputs without pull resistors
t_PZH/t_PLZ Max	8.6 ns at V_CC = 1.8V - ensures fast bus release during direction or enable transitions
Operating Temp	−40°C to +85°C - qualified for industrial-grade embedded and communications equipment
Input Leakage	±5.0 µA max - minimizes power loss and noise coupling in high-impedance control paths

Pinout & Package

74ALVCH245WM is housed in a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide, with body dimensions 12.8 mm × 7.5 mm × 2.35 mm and 1.27 mm lead pitch.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Active-low Output Enable	Disables both A and B ports simultaneously into high-impedance state; critical for bus arbitration
2 (A0)	Side A Data I/O with Bushold	Bidirectional buffer input/output with internal hold circuit; no external pull required
3 (A1)	Side A Data I/O with Bushold	Same as A0 - supports 8-bit parallel bus interface with consistent input behavior
19 (B7)	Side B Data I/O with Bushold	Final bit of B-side bus; mirrors A-side functionality with independent direction control
20 (T/R)	Transmit/Receive Direction Control	High = A→B data flow; Low = B→A; determines real-time bus directionality

Key Features

Feature	Design Value
Bushold Inputs	Eliminates need for 16 external pull-up resistors on A0–A7 and B0–B7, reducing BOM count and board space
Quiet Series™ EMI Reduction	Patented output driver design lowers switching noise and radiated emissions in dense PCB layouts
Multi-Voltage Compatibility	Single device supports 1.8V, 2.5V, and 3.3V logic domains without level shifters or voltage translators
JEDEC Latchup Compliance	Conforms to JED78 - ensures robustness against latchup under transient overvoltage or ESD stress
Low Quiescent ICC	10 µA max at V_CC = 3.6V - enables use in always-on or low-power standby subsystems

Applications

Memory Interface Bus	Microcontroller Peripheral Expansion
Use Scenario: Interfacing an 8-bit microcontroller to external SRAM or EEPROM with shared address/data bus. IC Role / Device Role / Timing Role: Bidirectional data transceiver enabling time-multiplexed read/write access while isolating controller and memory I/O. Use Value: Bushold prevents floating bus states during chip select transitions, eliminating bus contention and data corruption.	Use Scenario: Expanding GPIO count of an MCU by connecting parallel I/O port expanders or LCD controllers. IC Role / Device Role / Timing Role: Level-shifting and direction-controlled data conduit between MCU and peripheral ICs operating at same or different V_CC. Use Value: 3.6 ns propagation delay ensures timing margins are preserved in 20+ MHz peripheral clock domains.
Industrial Control Backplane	Legacy System Voltage Translation
Use Scenario: Isolating and buffering sensor/actuator data across modular PLC backplane slots with varying supply rails. IC Role / Device Role / Timing Role: Hot-swap-capable bus interface with high-impedance disable state and robust ESD immunity (>2000V HBM). Use Value: −40°C to +85°C rating and latchup immunity ensure reliability in uncontrolled factory environments.	Use Scenario: Migrating legacy 3.3V logic designs to newer 1.8V SoCs while retaining existing 3.3V peripherals. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional translator supporting simultaneous 1.8V and 3.3V signaling on A and B sides. Use Value: Operates correctly across full 1.65–3.6V range without external biasing or direction logic rework.

Memory Interface Bus

Microcontroller Peripheral Expansion

Use Scenario: Interfacing an 8-bit microcontroller to external SRAM or EEPROM with shared address/data bus.

IC Role / Device Role / Timing Role: Bidirectional data transceiver enabling time-multiplexed read/write access while isolating controller and memory I/O.

Use Value: Bushold prevents floating bus states during chip select transitions, eliminating bus contention and data corruption.

Use Scenario: Expanding GPIO count of an MCU by connecting parallel I/O port expanders or LCD controllers.

IC Role / Device Role / Timing Role: Level-shifting and direction-controlled data conduit between MCU and peripheral ICs operating at same or different V_CC.

Use Value: 3.6 ns propagation delay ensures timing margins are preserved in 20+ MHz peripheral clock domains.

Industrial Control Backplane

Legacy System Voltage Translation

Use Scenario: Isolating and buffering sensor/actuator data across modular PLC backplane slots with varying supply rails.

IC Role / Device Role / Timing Role: Hot-swap-capable bus interface with high-impedance disable state and robust ESD immunity (>2000V HBM).

Use Value: −40°C to +85°C rating and latchup immunity ensure reliability in uncontrolled factory environments.

Use Scenario: Migrating legacy 3.3V logic designs to newer 1.8V SoCs while retaining existing 3.3V peripherals.

IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional translator supporting simultaneous 1.8V and 3.3V signaling on A and B sides.

Use Value: Operates correctly across full 1.65–3.6V range without external biasing or direction logic rework.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC245A	No bushold; requires external pull resistors on unused inputs; slightly higher t_PD (4.2 ns @ 3.3V)	Suitable where board layout allows discrete pull-ups and lower EMI sensitivity is acceptable	Prefer 74ALVCH245WM when minimizing external components and improving noise immunity are priorities
74AVC245	Lower V_CC min (1.2V); no bushold; higher speed (2.4 ns @ 3.3V); smaller TSSOP-only footprint	Better for ultra-low-voltage portable systems but lacks bushold-driven simplicity for industrial wiring	Choose 74ALVCH245WM for industrial or legacy upgrade where bushold simplifies design and SOIC is preferred

Compared with SN74LVC245A and 74AVC245, the 74ALVCH245WM uniquely combines bushold input retention, SOIC packaging, and proven industrial temperature operation-making it optimal for cost-sensitive, component-count-constrained bus interfaces requiring zero external biasing.

Availability

74ALVCH245WM is available at Aetrix Electronics and suitable for memory interface bus, microcontroller peripheral expansion, and industrial control backplane applications requiring stable component supply, long-term lifecycle support, and JEDEC-compliant sourcing.

Supply support for 74ALVCH245WM 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 and supported.

The ALVCH family was developed to deliver high-speed, low-voltage, bushold-enabled logic for industrial and computing bus architectures where signal integrity and component count reduction were critical design goals.

FAQ

What is the maximum propagation delay of the 74ALVCH245WM at 3.3V?

The 74ALVCH245WM has a maximum propagation delay (t_PHL/t_PLH) of 3.6 ns when V_CC = 3.3V ± 0.3V, CL = 50 pF, and TA = −40°C to +85°C. This value is measured under worst-case loading and temperature conditions and confirms suitability for sub-10 ns timing-critical bus applications. The 74ALVCH245WM achieves this performance while maintaining low power dissipation through advanced CMOS fabrication.

Does the 74ALVCH245WM require external pull-up resistors on its data inputs?

No, the 74ALVCH245WM does not require external pull-up resistors on A0–A7 or B0–B7 due to integrated bushold circuitry. This feature actively holds floating inputs at valid logic levels using internal feedback, reducing BOM cost and PCB area. The 74ALVCH245WM's bushold current is ±75 µA at 3.0V, ensuring reliable state retention even with long trace stubs or unterminated lines.

What package type is used for the 74ALVCH245WM?

The 74ALVCH245WM uses a 20-lead Small Outline Integrated Circuit (SOIC) package, designated as Package Number M20B per JEDEC MS-013, 0.300" wide. Its dimensions are 12.8 mm × 7.5 mm × 2.35 mm with 1.27 mm lead pitch. This industry-standard SOIC footprint ensures compatibility with automated assembly and legacy board designs requiring through-hole or surface-mount interchangeability.

What is the operating temperature range for the 74ALVCH245WM?

The 74ALVCH245WM is rated for free-air operating temperatures from −40°C to +85°C, qualifying it for industrial-grade applications. This range is verified across all electrical parameters including propagation delay, output drive, and bushold functionality. The 74ALVCH245WM's thermal performance is validated per JEDEC JESD22-A104 and supports deployment in factory automation, networking infrastructure, and outdoor-rated electronics.

How does the T/R pin control data direction in the 74ALVCH245WM?

The T/R (Transmit/Receive) pin on the 74ALVCH245WM determines real-time data flow direction: when T/R is HIGH, data passes from Side A (A0–A7) to Side B (B0–B7); when LOW, data flows from B to A. This bidirectional control operates independently of OE, allowing dynamic bus reversal without disabling outputs. The 74ALVCH245WM's truth table confirms deterministic behavior with no metastability under valid setup/hold timing.

74ALVCH245WM Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74ALVCH

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:: 1.65V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

74ALVCH245WM FAQ

1.How can I place an order for 74ALVCH245WM through Aetrix?

Please submit a Request for Quotation (RFQ) for 74ALVCH245WM 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 74ALVCH245WM reliable?

The price and inventory of 74ALVCH245WM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ALVCH245WM is usually 5 days.

3.What payment methods are accepted for 74ALVCH245WM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ALVCH245WM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74ALVCH245WM?

74ALVCH245WM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74ALVCH245WM 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 74ALVCH245WM?

For technical support, including 74ALVCH245WM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ALVCH245WM requirements.

6.How does Aetrix verify that 74ALVCH245WM is sourced from the original manufacturer or authorized distributors?

All 74ALVCH245WM 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 74ALVCH245WM meets industry standards.

7.What is the process for return or replacement of 74ALVCH245WM?

All 74ALVCH245WM units undergo pre-shipment inspection (PSI). If there is an issue with 74ALVCH245WM, 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 74ALVCH245WM part is unused and in its original packaging.

Return procedure for 74ALVCH245WM:

1.Submit a request within 90 days.

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

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