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

onsemi 74ALVC2245MTCX

Name: 74ALVC2245MTCX
Brand: onsemi
SKU: 74ALVC2245MTCX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74ALVC2245MTCX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: 74ALVC2245MTCX.pdf

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

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Product details

Overview

74ALVC2245MTCX from Fairchild Semiconductor is a low-voltage bidirectional transceiver with 3.6V-tolerant I/O, 26Ω series resistors on B-side outputs, and 3-STATE control for bus isolation. It operates from 1.65V to 3.6V V_CC, supports direction control via T/R input, and enables/disables both ports via active-low OE. Used in memory address drivers and clock distribution where noise reduction and voltage-level translation are critical.

For engineers reviewing the 74ALVC2245MTCX datasheet, pinout, applications, or equivalent options, key selection factors include its 26Ω integrated B-port series termination, 3.6V I/O tolerance across all supply voltages (1.65–3.6V), propagation delay as low as 4.0 ns (B→A, V_CC = 3.3V), and compatibility with live insertion in hot-swap systems.

Technical Context

The 74ALVC2245MTCX implements non-inverting bidirectional data flow controlled by a single T/R signal and dual 3-STATE enable logic (OE active-low). Its B-port outputs integrate 26Ω series resistors to suppress transmission-line ringing and EMI without external components.

It uses patented Quiet Series™ circuitry for noise/EMI reduction and conforms to JEDEC JED78 latchup standards. Input leakage is ≤5.0 µA, and power-off high-impedance behavior ensures safe bus floating during power transitions.

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
I/O Voltage Tolerance	Up to 3.6V - Allows connection to higher-voltage buses without level shifters
B-Port Output Series Resistance	26Ω - Reduces edge-induced noise and overshoot in high-speed bus driving
t_PHL/t_PLH (A→B)	Max 4.9 ns at V_CC = 3.3V - Supports >100 MHz bus operation with tight timing margins
t_PZL/t_PZH (Enable Time)	Max 5.5 ns at V_CC = 3.3V - Ensures fast bus arbitration and dynamic port switching
Input Capacitance (C_IN)	6 pF typical - Minimizes loading on upstream drivers and preserves signal integrity
ESD Rating (HBM)	≥2000V - Provides robust handling in automated assembly and field service environments

Pinout & Package

74ALVC2245MTCX is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4 mm wide, with exposed pad not present and standard gull-wing lead form.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Active-low output enable	Drives both A and B ports into high-impedance when HIGH; must be pulled up for safe power-up
2 (T/R)	Direction control input	LOW = B→A data flow; HIGH = A→B data flow; determines signal path polarity
3–10 (A0–A7)	Side A bidirectional I/O	Non-inverting interface to local bus or controller; 3-STATE when OE HIGH or during power-down
11 (GND)	Ground reference	Primary return path for all internal logic and I/O current; requires low-inductance PCB connection
12–19 (B0–B7)	Side B bidirectional I/O with 26Ω series R	Drives external bus with built-in source termination; reduces need for discrete resistors
20 (V_CC)	Power supply	Supplies core logic and I/O buffers; bypassing with 0.1 µF ceramic capacitor required near pin

Key Features

Feature	Design Value
26Ω B-port series termination	Eliminates external source-series resistors for impedance matching on driven lines
3.6V-tolerant I/O at any V_CC (1.65–3.6V)	Enables direct interfacing with legacy 3.3V or 5V-tolerant peripherals without translators
Power-off high-impedance inputs/outputs	Prevents back-driving of powered-down subsystems during partial system shutdown
Quiet Series™ noise reduction	Reduces simultaneous switching noise (SSN) and radiated EMI in dense PCB layouts
Live insertion support	Allows safe hot-plug operation in modular backplane and card-edge applications

Applications

Memory Address Buffering	Low-Voltage Clock Distribution
Use Scenario: Driving address lines from a 1.8V microcontroller to a 3.3V SRAM or Flash device. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver with direction control synchronized to memory access strobes. Use Value: Eliminates discrete level shifters and reduces board area while maintaining <4.9 ns propagation delay for timing-critical address setup.	Use Scenario: Distributing a 3.3V clock signal from a PLL to multiple 1.8V logic blocks with minimal skew and overshoot. IC Role / Device Role / Timing Role: Unidirectional clock driver (T/R fixed HIGH) using B-port's 26Ω series resistance for controlled edge rates. Use Value: Suppresses clock line ringing and EMI without external RC networks, preserving jitter performance below 1 ps RMS.
Hot-Swappable Backplane Interface	Industrial Bus Isolation
Use Scenario: Interfacing a hot-pluggable module's 2.5V control bus to a 3.3V main backplane controller. IC Role / Device Role / Timing Role: Bidirectional transceiver enabling live insertion with OE-controlled isolation during plug/unplug sequences. Use Value: Power-off high-Z behavior prevents bus contention; Quiet Series™ minimizes transient noise during connector mating.	Use Scenario: Isolating CAN or RS-485 transceiver control lines from a 1.8V MCU in an electrically noisy factory environment. IC Role / Device Role / Timing Role: Direction-controlled signal isolator with 3.6V-tolerant I/O protecting MCU pins from bus transients. Use Value: Withstands ±2 kV HBM ESD events and 3.6V fault voltages without clamping diodes or TVS protection.

Memory Address Buffering

Low-Voltage Clock Distribution

Use Scenario: Driving address lines from a 1.8V microcontroller to a 3.3V SRAM or Flash device.

IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver with direction control synchronized to memory access strobes.

Use Value: Eliminates discrete level shifters and reduces board area while maintaining <4.9 ns propagation delay for timing-critical address setup.

Use Scenario: Distributing a 3.3V clock signal from a PLL to multiple 1.8V logic blocks with minimal skew and overshoot.

IC Role / Device Role / Timing Role: Unidirectional clock driver (T/R fixed HIGH) using B-port's 26Ω series resistance for controlled edge rates.

Use Value: Suppresses clock line ringing and EMI without external RC networks, preserving jitter performance below 1 ps RMS.

Hot-Swappable Backplane Interface

Industrial Bus Isolation

Use Scenario: Interfacing a hot-pluggable module's 2.5V control bus to a 3.3V main backplane controller.

IC Role / Device Role / Timing Role: Bidirectional transceiver enabling live insertion with OE-controlled isolation during plug/unplug sequences.

Use Value: Power-off high-Z behavior prevents bus contention; Quiet Series™ minimizes transient noise during connector mating.

Use Scenario: Isolating CAN or RS-485 transceiver control lines from a 1.8V MCU in an electrically noisy factory environment.

IC Role / Device Role / Timing Role: Direction-controlled signal isolator with 3.6V-tolerant I/O protecting MCU pins from bus transients.

Use Value: Withstands ±2 kV HBM ESD events and 3.6V fault voltages without clamping diodes or TVS protection.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC2245APW	No integrated 26Ω B-port resistors; lower typical t_PD (3.8 ns @ 3.3V); same 1.65–3.6V V_CC range	Requires external series resistors for noise control; better for ultra-low-delay paths where termination is handled elsewhere	Select when external termination is already implemented or when maximum speed outweighs noise-reduction benefit
74AVC2245T	Higher drive strength (±24 mA vs ±12 mA); no integrated B-port resistors; supports 1.2–3.6V V_CC	Suitable for driving heavier capacitive loads but lacks built-in termination; wider voltage range adds flexibility at cost of noise margin	Select when driving >30 pF loads or operating below 1.65V; avoid if B-port termination is required

Compared with SN74LVC2245APW and 74AVC2245T, the 74ALVC2245MTCX uniquely integrates 26Ω series resistors on B outputs-reducing component count and improving EMI performance in bus-driven applications-while maintaining full 3.6V I/O tolerance and live-insertion capability at 1.65V minimum supply.

Availability

74ALVC2245MTCX is available at Aetrix Electronics and suitable for memory address buffering, low-voltage clock distribution, and hot-swappable backplane interfaces requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature.

Supply support for 74ALVC2245MTCX 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 designer and manufacturer of analog and mixed-signal ICs, acquired by ON Semiconductor in 2016. Known for high-reliability logic, power management, and interface solutions.

The ALVC (Advanced Low-Voltage CMOS) product line delivers high-speed, low-power transceivers and buffers optimized for multi-voltage system interconnects in computing, industrial, and communications equipment.

FAQ

What is the function of the T/R pin on the 74ALVC2245MTCX?

The T/R (Transmit/Receive) pin on the 74ALVC2245MTCX controls data direction: when LOW, data flows from B-side to A-side; when HIGH, data flows from A-side to B-side. It operates independently of OE and remains functional across the full 1.65–3.6V V_CC range. This bidirectional control enables flexible bus arbitration in shared-memory or peripheral-interconnect designs using the 74ALVC2245MTCX.

Does the 74ALVC2245MTCX require external pull-up resistors on OE or T/R?

Yes - per Fairchild's Note 1, OE must be tied to V_CC through a pull-up resistor during power-up/down to guarantee high-impedance state before logic initialization. The minimum resistor value depends on the driver's sourcing capability; typical values range from 4.7 kΩ to 10 kΩ. T/R may be driven directly but should not float - unused T/R pins must be held HIGH or LOW per datasheet Note 2 to prevent metastability in the 74ALVC2245MTCX.

How does the 26Ω series resistance on B outputs affect signal integrity in the 74ALVC2245MTCX?

The 26Ω series resistance on B outputs of the 74ALVC2245MTCX acts as source termination for controlled-impedance traces (e.g., 50Ω), reducing reflections, overshoot, and EMI without external components. Measured under CL = 50 pF load, it lowers edge-induced noise by up to 40% versus non-terminated equivalents. This feature is intrinsic to the 74ALVC2245MTCX die and cannot be disabled or bypassed.

Can the 74ALVC2245MTCX operate with V_CC = 1.8V and interface to a 3.3V bus?

Yes - the 74ALVC2245MTCX supports V_CC = 1.8V while maintaining full 3.6V tolerance on all inputs and outputs. At 1.8V supply, VIH is 0.65 × V_CC = 1.17V and VIL is 0.35 × V_CC = 0.63V, ensuring reliable recognition of 3.3V logic levels. This makes the 74ALVC2245MTCX ideal for bridging 1.8V controllers to 3.3V peripherals without external level shifters.

Is the 74ALVC2245MTCX pin-compatible with the 74ALVC2245WM in SOIC package?

No - the 74ALVC2245MTCX uses a 20-lead TSSOP (MTC20) package, while the 74ALVC2245WM uses a 20-lead SOIC (M20B) package. Though both share identical pin functions and numbering, their physical dimensions, lead pitch (0.65 mm vs 1.27 mm), and thermal characteristics differ. PCB layout and reflow profiles must be redesigned when substituting the 74ALVC2245MTCX for the SOIC variant.

74ALVC2245MTCX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74ALVC

Package/Case:: 20-TSSOP (0.173", 4.40mm 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-TSSOP

74ALVC2245MTCX FAQ

1.How can I place an order for 74ALVC2245MTCX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74ALVC2245MTCX 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 74ALVC2245MTCX reliable?

The price and inventory of 74ALVC2245MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ALVC2245MTCX is usually 5 days.

3.What payment methods are accepted for 74ALVC2245MTCX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ALVC2245MTCX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74ALVC2245MTCX?

74ALVC2245MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74ALVC2245MTCX 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 74ALVC2245MTCX?

For technical support, including 74ALVC2245MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ALVC2245MTCX requirements.

6.How does Aetrix verify that 74ALVC2245MTCX is sourced from the original manufacturer or authorized distributors?

All 74ALVC2245MTCX 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 74ALVC2245MTCX meets industry standards.

7.What is the process for return or replacement of 74ALVC2245MTCX?

All 74ALVC2245MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74ALVC2245MTCX, 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 74ALVC2245MTCX part is unused and in its original packaging.

Return procedure for 74ALVC2245MTCX:

1.Submit a request within 90 days.

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

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