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

onsemi 74ALVC2245WMX

Name: 74ALVC2245WMX
Brand: onsemi
SKU: 74ALVC2245WMX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74ALVC2245WMX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74ALVC2245WMX.pdf

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

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Product details

Overview

74ALVC2245WMX from Fairchild Semiconductor is a low-voltage bidirectional transceiver with 3-STATE outputs, designed for bus-oriented applications requiring direction control via T/R input and output enable via OE (active-low). It operates from 1.65V to 3.6V V_CC, supports 3.6V-tolerant I/O, and integrates 26Ω series resistors on B-port outputs for EMI reduction in memory address and clock driver circuits.

For engineers reviewing the 74ALVC2245WMX datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional data flow control, 3.6V I/O tolerance across 1.65–3.6V supply, propagation delay ≤4.9 ns (3.0–3.6V), 26Ω B-port series termination, and SOIC-20 package compatibility with JEDEC MS-013 footprint.

Technical Context

The 74ALVC2245WMX implements eight non-inverting bidirectional buffers with independent 3-STATE control per port, where OE disables both A and B sides simultaneously while T/R selects data direction (A→B or B→A). Its advanced CMOS process enables high-speed operation with low static power dissipation (I_CC ≤40 µA at V_CC = 3.6V).

It features patented Quiet Series™ noise/EMI reduction circuitry, power-off high-impedance inputs/outputs, and supports live insertion/withdrawal when OE is pulled up to V_CC. The 26Ω series resistors are exclusively on B-port outputs-A-port outputs lack internal termination-and all I/O pins tolerate up to 3.6V regardless of V_CC level.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65V 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 interfacing with legacy 3.3V or 5V systems when V_CC is as low as 1.65V.
B-Port Output Series Resistance	26Ω - Reduces ringing and EMI in high-speed bus driving (e.g., memory address lines, clock distribution).
t_PD (A→B)	≤4.9 ns max at 3.0–3.6V - Supports >200 MHz data rates in point-to-point or lightly loaded bus configurations.
Output Drive Strength	A-port: ±24 mA; B-port: ±12 mA - Matches drive capability to termination needs, with B-port limited by integrated 26Ω resistor.
Power-Off High-Z	Yes - Prevents back-driving or contention when V_CC = 0V, critical for hot-swap and partial-power-down systems.
ESD Rating	HBM ≥2000V, MM ≥200V - Meets industrial-grade robustness requirements without external protection.

Pinout & Package

74ALVC2245WMX is packaged in a 20-lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013 compliant, 0.300" wide body (Package Number M20B), with standard lead pitch of 0.050" (1.27 mm) and gull-wing leads.

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 hot-swap safety.
2 (T/R)	Direction Control Input	LOW routes data from B→A; HIGH routes data from A→B; no internal pull-up/pull-down.
3–10 (A0–A7)	Side A Bidirectional I/O	Non-inverting buffer path; no series resistance; full drive strength (±24 mA).
11 (GND)	Ground Reference	Primary return path for V_CC current and signal reference; decoupling capacitor required adjacent to pin.
12–19 (B0–B7)	Side B Bidirectional I/O	Non-inverting buffer path with integrated 26Ω series resistor per output; reduced EMI during switching.
20 (V_CC)	Power Supply	Accepts 1.65–3.6V; supplies core logic and I/O drivers; requires local 0.1 µF ceramic decoupling.

Key Features

Feature	Design Value
3.6V I/O Tolerance	Enables mixed-voltage system integration without external level translators, even when V_CC = 1.65V.
26Ω B-Port Series Termination	Reduces edge-induced EMI and overshoot in PCB traces up to ~10 cm, eliminating need for discrete series resistors.
Quiet Series™ Noise Reduction	Patented slew-rate control and output stage design lowers simultaneous switching noise (SSN) by >40% vs. standard ALVC.
Live Insertion Support	Guaranteed high-impedance state during power-up/down when OE is externally pulled to V_CC, enabling hot-plug module designs.
JEDEC JED78 Latchup Immunity	Withstands >100 mA latchup current, ensuring reliability in noisy industrial environments with transient coupling.

Applications

Memory Address Driver	Low-Voltage Bus Transceiver
Use Scenario: Driving address lines from a 1.8V microcontroller to a 3.3V SRAM or Flash device with trace lengths ≤8 cm. IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant interface translating logic levels while maintaining timing integrity and minimizing reflections. Use Value: Eliminates discrete level shifters and series resistors; 26Ω B-port termination suppresses ringing on address bus, improving setup/hold margin by ≥1.2 ns.	Use Scenario: Isolating two 2.5V processor subsystems sharing a common data bus, with dynamic direction control via FPGA GPIO. IC Role / Device Role / Timing Role: Direction-controllable transceiver providing galvanic isolation between bus segments and preventing contention during mode transitions. Use Value: OE and T/R inputs allow precise timing coordination; 4.9 ns A→B propagation enables 200+ MHz burst transfers without added latency.
Hot-Swappable Module Interface	EMI-Sensitive Clock Distribution
Use Scenario: Backplane slot interface where daughter cards may be inserted/removed while main system remains powered. IC Role / Device Role / Timing Role: Provides controlled bus access with guaranteed high-Z during power sequencing, preventing back-drive damage. Use Value: Power-off high-Z and OE pull-up requirement ensure safe insertion; latchup immunity prevents failure during contact bounce events.	Use Scenario: Distributing a 50 MHz system clock from a 3.3V oscillator to multiple 1.8V logic blocks on same PCB. IC Role / Device Role / Timing Role: Low-skew, low-noise buffer with built-in source termination to dampen clock edge harmonics. Use Value: 26Ω B-port series resistance reduces 3rd/5th harmonic energy by >15 dBµV/m, easing EMC pre-compliance testing.

Memory Address Driver

Low-Voltage Bus Transceiver

Use Scenario: Driving address lines from a 1.8V microcontroller to a 3.3V SRAM or Flash device with trace lengths ≤8 cm.

IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant interface translating logic levels while maintaining timing integrity and minimizing reflections.

Use Value: Eliminates discrete level shifters and series resistors; 26Ω B-port termination suppresses ringing on address bus, improving setup/hold margin by ≥1.2 ns.

Use Scenario: Isolating two 2.5V processor subsystems sharing a common data bus, with dynamic direction control via FPGA GPIO.

IC Role / Device Role / Timing Role: Direction-controllable transceiver providing galvanic isolation between bus segments and preventing contention during mode transitions.

Use Value: OE and T/R inputs allow precise timing coordination; 4.9 ns A→B propagation enables 200+ MHz burst transfers without added latency.

Hot-Swappable Module Interface

EMI-Sensitive Clock Distribution

Use Scenario: Backplane slot interface where daughter cards may be inserted/removed while main system remains powered.

IC Role / Device Role / Timing Role: Provides controlled bus access with guaranteed high-Z during power sequencing, preventing back-drive damage.

Use Value: Power-off high-Z and OE pull-up requirement ensure safe insertion; latchup immunity prevents failure during contact bounce events.

Use Scenario: Distributing a 50 MHz system clock from a 3.3V oscillator to multiple 1.8V logic blocks on same PCB.

IC Role / Device Role / Timing Role: Low-skew, low-noise buffer with built-in source termination to dampen clock edge harmonics.

Use Value: 26Ω B-port series resistance reduces 3rd/5th harmonic energy by >15 dBµV/m, easing EMC pre-compliance testing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC2245APWR	No integrated series resistors on either port; higher drive strength (±24 mA both sides); identical 3.6V I/O tolerance and V_CC range.	Requires external 26Ω resistors on B-side if EMI reduction is needed; better suited for point-to-point loads with controlled impedance.	Select when board layout allows discrete termination and maximum flexibility in drive strength configuration.
74AVC2245T16	Smaller 16-pin TSSOP package; only 4-bit width (vs. 8-bit); same 26Ω B-port termination and 1.65–3.6V operation.	Used in space-constrained, lower-bandwidth interfaces (e.g., sensor hub buses); not pin-compatible due to pin count and function mapping differences.	Select when footprint area is critical and 4-bit data width suffices; verify T/R and OE pin assignments differ from 74ALVC2245WMX.

Compared with SN74LVC2245APWR and 74AVC2245T16, the 74ALVC2245WMX uniquely combines 8-bit bidirectional buffering, factory-integrated 26Ω B-port termination, and SOIC-20 packaging-making it optimal for legacy-compatible, EMI-sensitive memory and bus interfaces where board space and component count are prioritized over ultimate drive flexibility.

Availability

74ALVC2245WMX is available at Aetrix Electronics and suitable for memory address drivers, low-voltage bus transceivers, and hot-swappable module interfaces requiring stable component supply, long-term lifecycle support, and JEDEC-standard SOIC-20 compatibility.

Supply support for 74ALVC2245WMX 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 infrastructure.

The ALVC (Advanced Low-Voltage CMOS) family-including the 74ALVC2245WMX-is engineered for high-speed, low-power bidirectional bus interfacing in mixed-voltage systems, emphasizing noise immunity, voltage tolerance, and hot-swap readiness.

FAQ

What is the maximum propagation delay of the 74ALVC2245WMX at 3.3V operation?

The maximum propagation delay (t_PD) for the 74ALVC2245WMX is 4.9 ns when operating from 3.0V to 3.6V V_CC, measured A→B under CL = 50 pF and RL = 500 Ω conditions. This value ensures reliable timing closure in 200+ MHz synchronous bus applications. The 74ALVC2245WMX achieves this performance while maintaining sub-40 µA quiescent current at V_CC = 3.6V.

Does the 74ALVC2245WMX require external pull-up resistors on OE and T/R inputs?

Yes-the 74ALVC2245WMX has no internal pull-ups on OE or T/R. To ensure predictable high-impedance behavior during power-up/power-down, OE must be tied to V_CC via an external pull-up resistor (value determined by driver sourcing capability). T/R may be driven directly by a controller GPIO but should not float, as indeterminate direction could cause bus contention. This requirement is explicitly documented in Note 1 of the 74ALVC2245WMX datasheet.

Are the 26Ω series resistors present on both A and B ports of the 74ALVC2245WMX?

No-the 26Ω series resistors are present only on the B-port outputs (B0–B7) of the 74ALVC2245WMX. The A-port outputs (A0–A7) have no internal series resistance and deliver full drive strength (±24 mA). This asymmetry is intentional: B-port termination targets EMI-sensitive downstream loads (e.g., memory address lines), while A-port retains flexibility for high-drive or unterminated paths.

Can the 74ALVC2245WMX safely interface a 1.8V microcontroller with a 3.3V peripheral?

Yes-the 74ALVC2245WMX supports 3.6V-tolerant inputs and outputs across its entire 1.65V–3.6V V_CC range. When powered at 1.8V, it correctly interprets 3.3V logic HIGH signals (VIH ≥ 2.0V at V_CC = 3.0–3.6V, scaled per spec) and drives 3.3V-tolerant peripherals without damage. This eliminates level-shifter components in mixed-voltage designs using the 74ALVC2245WMX.

What is the thermal and environmental rating for the 74ALVC2245WMX in SOIC-20 package?

The 74ALVC2245WMX is rated for free-air operating temperature from –40°C to +85°C and storage temperature from –65°C to +150°C. Its SOIC-20 (M20B) package meets JEDEC MS-013 mechanical standards, with lead finish specified as matte tin. These ratings align with industrial-grade deployment requirements, including extended-temperature PCB assembly and long-term field operation in non-hermetic enclosures.

74ALVC2245WMX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74ALVC

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; 12mA, 12mA

Voltage - Supply:: 1.65V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

74ALVC2245WMX FAQ

1.How can I place an order for 74ALVC2245WMX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74ALVC2245WMX 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 74ALVC2245WMX reliable?

The price and inventory of 74ALVC2245WMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ALVC2245WMX is usually 5 days.

3.What payment methods are accepted for 74ALVC2245WMX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ALVC2245WMX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74ALVC2245WMX?

74ALVC2245WMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74ALVC2245WMX 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 74ALVC2245WMX?

For technical support, including 74ALVC2245WMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ALVC2245WMX requirements.

6.How does Aetrix verify that 74ALVC2245WMX is sourced from the original manufacturer or authorized distributors?

All 74ALVC2245WMX 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 74ALVC2245WMX meets industry standards.

7.What is the process for return or replacement of 74ALVC2245WMX?

All 74ALVC2245WMX units undergo pre-shipment inspection (PSI). If there is an issue with 74ALVC2245WMX, 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 74ALVC2245WMX part is unused and in its original packaging.

Return procedure for 74ALVC2245WMX:

1.Submit a request within 90 days.

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

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