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Texas Instruments SN74ALVCH245DW

Name: SN74ALVCH245DW
Brand: Texas Instruments
SKU: SN74ALVCH245DW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74ALVCH245DW

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: SN74ALVCH245DW.pdf

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

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Product details

Overview

SN74ALVCH245DW from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 1.65-V to 3.6-V buses. It features bus-hold circuitry on all data inputs, ±24-mA output drive at 3.3 V, and a maximum propagation delay of 3.4 ns at 3.3 V. It is used in low-voltage system interconnects such as memory expansion, peripheral bridging, and FPGA-to-ASIC data path isolation.

For engineers reviewing the SN74ALVCH245DW datasheet, SN74ALVCH245DW pinout, SN74ALVCH245DW application, or SN74ALVCH245DW equivalent, key selection criteria include voltage compatibility (1.65–3.6 V), direction-control logic behavior, bus-hold functionality eliminating external resistors, and SOIC-20 thermal performance (θ_JA = 58°C/W).

Technical Context

The SN74ALVCH245DW implements dual-directional 8-bit data routing controlled by DIR (direction) and OE (output enable) inputs. Its bus-hold circuitry actively maintains valid logic states on undriven A/B port inputs without external biasing, reducing BOM count and layout complexity. The device supports hot-insertion tolerance via power-up/down high-impedance control when OE is pulled up to V_CC.

It operates across -40°C to +85°C with latch-up immunity exceeding 100 mA per JESD 78 Class II. Input thresholds scale with V_CC: VIH = 0.65×V_CC (1.65–1.95 V), 1.7 V (2.3–2.7 V), or 2 V (2.7–3.6 V); VIL = 0.35×V_CC, 0.7 V, or 0.8 V respectively - enabling robust noise margin across supply voltages.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65 V to 3.6 V - enables interoperability across mixed-voltage systems including 1.8-V, 2.5-V, and 3.3-V domains.
t_pd Max	3.4 ns at 3.3 V - supports high-speed data handshaking in real-time peripheral interfaces and memory buffers.
I_OH/I_OL	±24 mA at 3.3 V - drives heavy capacitive loads or multiple CMOS inputs without signal degradation.
Bus-Hold Current	±75 µA at 3 V - maintains stable logic levels on floating inputs, eliminating need for pullup/pulldown resistors.
θ_JA	58°C/W (SOIC-DW) - defines thermal resistance for PCB-level power dissipation management in compact layouts.
IOZ (Off-State Leakage)	±10 µA at 3.6 V - ensures minimal current leakage during 3-state isolation, critical for low-power standby modes.
Latch-Up Immunity	>100 mA per JESD 78 Class II - guarantees robustness against transient-induced parasitic thyristor activation.

Pinout & Package

SN74ALVCH245DW uses a 20-pin SOIC (DW) package with 7.5-mm body width, 2.65-mm max height, and 1.27-mm lead pitch. Pin 1 is located at the top-left corner with a beveled edge marker; leads are gull-wing shaped and RoHS-compliant NIPDAU-finished.

Pin/Terminal	Circuit Role	Design Meaning
1 (DIR)	Direction Control Input	Determines data flow: LOW = B→A, HIGH = A→B; referenced to V_CC/GND, no internal pullup.
2–9 (A1–A8)	Port A Data Inputs/Outputs	Bidirectional I/O pins connected to source bus; bus-hold active when undriven.
10 (GND)	Ground Reference	Primary return path for all internal logic and output drivers; must be low-impedance.
11 (V_CC)	Power Supply	Single-supply input for core logic and I/O drivers; bypass capacitor required near pin.
12 (OE)	Output Enable Input	Active-LOW control: LOW enables transceiver, HIGH forces all A/B outputs into high-impedance state.
13–20 (B1–B8)	Port B Data Inputs/Outputs	Bidirectional I/O pins connected to destination bus; identical bus-hold and drive characteristics as A-side.

Key Features

Feature	Design Value
Wide V_CC Range (1.65–3.6 V)	Enables drop-in use across 1.8-V microcontrollers, 2.5-V FPGAs, and 3.3-V peripherals without level shifters.
Integrated Bus-Hold Circuitry	Eliminates 16 external pullup/pulldown resistors in typical 8-bit bus applications, reducing component count and board area.
High-Speed Propagation (3.4 ns @ 3.3 V)	Supports >100-MHz data throughput in burst-mode transfers between synchronous logic blocks.
±24-mA Output Drive Strength	Drives 15+ CMOS loads or 30-pF trace capacitance while maintaining TTL-compatible VOH/VOL margins.
Hot-Insertion Support	OE tied to V_CC via pullup ensures high-Z state during power sequencing, preventing backdrive damage.

Applications

Memory Expansion Interface	FPGA-to-Microcontroller Bridge
Use Scenario: Connecting an 8-bit SRAM or Flash memory to a microcontroller with mismatched voltage domains (e.g., 1.8-V MCU to 3.3-V memory). IC Role / Device Role / Timing Role: Bidirectional voltage-transparent data path controller that isolates buses during read/write cycles and prevents contention during address latching. Use Value: Eliminates discrete level shifters and reduces PCB layer count by integrating bus-hold and 3-state control in one SOIC-20 package.	Use Scenario: Interfacing a Xilinx Spartan FPGA I/O bank (2.5 V) with an ARM Cortex-M4 MCU (3.3 V) for debug trace or configuration data exchange. IC Role / Device Role / Timing Role: Asynchronous protocol-agnostic transceiver managing direction switching under FPGA control, with timing margins validated down to 3.4 ns t_pd. Use Value: Enables deterministic setup/hold timing across voltage domains without custom delay matching or additional clock domain crossing logic.
Industrial I/O Module Backplane	Legacy Peripheral Adapter
Use Scenario: Isolating sensor ADC data lines from a noisy PLC backplane bus operating at 3.3 V while interfacing with a 1.8-V isolated analog front-end. IC Role / Device Role / Timing Role: Fault-tolerant bus buffer providing latch-up immunity (>100 mA) and ESD-robust I/O (per JESD 78 Class II) in harsh environments. Use Value: Reduces field failure rate by replacing fragile discrete protection networks with integrated bus-hold and high-drive outputs.	Use Scenario: Adapting parallel printer port signals (5 V TTL legacy) to a modern 3.3-V SoC using resistor-divider-free level translation. IC Role / Device Role / Timing Role: Direction-controlled data shuttle synchronized to strobe signals, with OE disabling outputs during handshake assertion. Use Value: Maintains signal integrity over 15-cm ribbon cables by driving 24 mA into 50-Ω traces, avoiding rise-time degradation seen with weak-buffer alternatives.

Memory Expansion Interface

FPGA-to-Microcontroller Bridge

Use Scenario: Connecting an 8-bit SRAM or Flash memory to a microcontroller with mismatched voltage domains (e.g., 1.8-V MCU to 3.3-V memory).

IC Role / Device Role / Timing Role: Bidirectional voltage-transparent data path controller that isolates buses during read/write cycles and prevents contention during address latching.

Use Value: Eliminates discrete level shifters and reduces PCB layer count by integrating bus-hold and 3-state control in one SOIC-20 package.

Use Scenario: Interfacing a Xilinx Spartan FPGA I/O bank (2.5 V) with an ARM Cortex-M4 MCU (3.3 V) for debug trace or configuration data exchange.

IC Role / Device Role / Timing Role: Asynchronous protocol-agnostic transceiver managing direction switching under FPGA control, with timing margins validated down to 3.4 ns t_pd.

Use Value: Enables deterministic setup/hold timing across voltage domains without custom delay matching or additional clock domain crossing logic.

Industrial I/O Module Backplane

Legacy Peripheral Adapter

Use Scenario: Isolating sensor ADC data lines from a noisy PLC backplane bus operating at 3.3 V while interfacing with a 1.8-V isolated analog front-end.

IC Role / Device Role / Timing Role: Fault-tolerant bus buffer providing latch-up immunity (>100 mA) and ESD-robust I/O (per JESD 78 Class II) in harsh environments.

Use Value: Reduces field failure rate by replacing fragile discrete protection networks with integrated bus-hold and high-drive outputs.

Use Scenario: Adapting parallel printer port signals (5 V TTL legacy) to a modern 3.3-V SoC using resistor-divider-free level translation.

IC Role / Device Role / Timing Role: Direction-controlled data shuttle synchronized to strobe signals, with OE disabling outputs during handshake assertion.

Use Value: Maintains signal integrity over 15-cm ribbon cables by driving 24 mA into 50-Ω traces, avoiding rise-time degradation seen with weak-buffer alternatives.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC245A	No bus-hold; requires external pullups/pulldowns on unused inputs; lower drive (±24 mA only at 3.3 V, derated at 1.8 V).	Suitable for cost-sensitive designs where input biasing is already implemented; not ideal for floating-bus scenarios.	Choose when BOM simplification is secondary to lowest unit cost and bus-hold is unnecessary.
74AVC245	Wider V_CC range (1.2–3.6 V); higher speed (t_pd = 2.4 ns @ 3.3 V); same SOIC-20 footprint but different pinout (DIR/OE swapped).	Requires PCB redesign due to pinout mismatch; better for ultra-low-voltage (1.2 V) or sub-3-ns timing-critical paths.	Choose only if migrating to 1.2-V operation or needing <3 ns propagation; not pin-compatible with SN74ALVCH245DW.

Compared with SN74LVC245A and 74AVC245, the SN74ALVCH245DW uniquely combines integrated bus-hold, guaranteed 3.4-ns timing at 3.3 V, and SOIC-20 pinout compatibility - making it optimal for retrofitting legacy 5-V systems to 3.3-V operation without layout changes or added passives.

Availability

SN74ALVCH245DW is available at Aetrix Electronics and suitable for industrial I/O modules, FPGA interface boards, and embedded memory expansion requiring stable component supply across extended temperature ranges (-40°C to +85°C).

Supply support for SN74ALVCH245DW 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of experience in high-reliability interface IC design.

The SN74ALVCH245DW belongs to TI's ALVC/ALVCH advanced low-voltage CMOS logic family, engineered for low-noise, high-speed bidirectional data transfer in mixed-voltage digital systems.

FAQ

What is the recommended power-up sequence for SN74ALVCH245DW?

TI recommends tying OE to V_CC through a pullup resistor (minimum value determined by driver sink capability) to ensure outputs remain in high-impedance state during power ramp-up. This prevents bus contention before system controllers initialize. The SN74ALVCH245DW does not require special sequencing between V_CC and GND, but V_CC must stabilize within ±5% before applying input signals. Always decouple V_CC with a 0.1-µF ceramic capacitor placed within 5 mm of pin 11.

Does SN74ALVCH245DW support hot-swap operation?

Yes, the SN74ALVCH245DW supports hot-swap operation when OE is externally pulled up to V_CC. During insertion, the device enters high-impedance state until V_CC reaches ~1.5 V, preventing backdrive into live buses. Its bus-hold circuitry further stabilizes floating inputs during partial power-up. However, TI advises limiting hot-swap current to <100 mA per JESD 78 Class II latch-up rating - verified in the SN74ALVCH245DW datasheet SCES119G.

Can SN74ALVCH245DW operate reliably at 1.65 V V_CC?

Yes, the SN74ALVCH245DW is fully specified down to 1.65 V V_CC, with guaranteed t_pd ≤ 6 ns, VIH = 1.07 V, and VOL ≤ 0.45 V at I_OL = 4 mA. At this minimum voltage, output drive drops to ±4 mA, sufficient for driving light loads like FPGA I/O banks or low-capacitance traces. All timing parameters in the SN74ALVCH245DW datasheet SCES119G include 1.65-V test conditions.

How does bus-hold functionality affect signal integrity on SN74ALVCH245DW inputs?

Bus-hold circuitry on SN74ALVCH245DW inputs provides ±75 µA holding current at 3 V, actively maintaining last-valid logic state without external resistors. This eliminates floating-input oscillation and reduces EMI susceptibility. However, TI warns against combining bus-hold with external pullups/pulldowns, as competing currents degrade noise margins. Signal integrity remains optimal when bus-hold is used alone - confirmed in SN74ALVCH245DW application note SCBA004.

Is SN74ALVCH245DW pin-compatible with other 20-pin octal transceivers?

The SN74ALVCH245DW shares the standard SOIC-20 (DW) footprint and pinout with SN74LVC245A and SN74LVCH245A, enabling direct replacement in existing layouts. However, it is not pin-compatible with 74AVC245 (DIR/OE swapped) or 74ACT245 (different V_CC and drive specs). Always verify function table alignment: SN74ALVCH245DW uses DIR=LOW for B→A transfer, matching TI's ALVC/ALVCH family convention.

SN74ALVCH245DW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ALVCH

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

Packaging:: Bulk

Product Status:: Active

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

SN74ALVCH245DW FAQ

1.How can I place an order for SN74ALVCH245DW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74ALVCH245DW 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 SN74ALVCH245DW reliable?

The price and inventory of SN74ALVCH245DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH245DW is usually 5 days.

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SN74ALVCH245DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74ALVCH245DW 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 SN74ALVCH245DW?

For technical support, including SN74ALVCH245DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH245DW requirements.

6.How does Aetrix verify that SN74ALVCH245DW is sourced from the original manufacturer or authorized distributors?

All SN74ALVCH245DW 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 SN74ALVCH245DW meets industry standards.

7.What is the process for return or replacement of SN74ALVCH245DW?

All SN74ALVCH245DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH245DW, 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 SN74ALVCH245DW part is unused and in its original packaging.

Return procedure for SN74ALVCH245DW:

1.Submit a request within 90 days.

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

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