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Texas Instruments SN74ALVC245DWE4
- Part No.:
- SN74ALVC245DWE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALVC245DWE4.pdf
- Description:
- IC BUS TRANSCEIVER DUAL 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:855
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Product details
Overview
SN74ALVC245DWE4 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between 1.65-V to 3.6-V buses. It features ±24-mA drive strength at 3.3 V, 3.4-ns max propagation delay, and operates across –40°C to 85°C. Used in level-shifting interfaces between mixed-voltage logic domains in embedded controllers and FPGA I/O expansion.
For engineers reviewing the SN74ALVC245DWE4 datasheet, SN74ALVC245DWE4 pinout, SN74ALVC245DWE4 application, or SN74ALVC245DWE4 equivalent, key selection criteria include voltage translation capability (1.65–3.6 V), direction-control logic behavior, 3-state isolation timing (ten/tdis), and SOIC-20 thermal performance (θJA = 58°C/W).
Technical Context
The SN74ALVC245DWE4 implements dual-bus bidirectional data routing controlled by DIR (direction) and OE (output enable) inputs. Its CMOS ALVC logic family ensures low dynamic power and high noise immunity while supporting mixed-voltage operation without external level shifters.
It uses true 3-state output architecture with simultaneous high-impedance control across all eight channels. Latch-up performance exceeds 250 mA per JESD 17, and input transition rate is specified at ≤10 ns/V - critical for clean signal integrity in high-speed digital interconnects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65 V to 3.6 V - enables interoperability between 1.8-V, 2.5-V, and 3.3-V logic domains without level-shifter ICs. |
| Max Propagation Delay | 3.4 ns at 3.3 V - supports >100-MHz data throughput in synchronous bus applications. |
| Output Drive Strength | ±24 mA at 3.3 V - drives standard 50-Ω transmission lines or multiple CMOS loads with minimal signal degradation. |
| Input Thresholds | VIL = 0.35×VCC (min), VIH = 0.65×VCC (min) - ensures robust noise margin across full VCC range. |
| 3-State Enable/Disable Time | ten = 5.5 ns, tdis = 5.5 ns (at 3.3 V) - guarantees fast bus arbitration and prevents contention during direction switching. |
| Quiescent Current | ICC = 10 µA at 3.6 V - minimizes standby power in battery-backed or always-on subsystems. |
| ESD Rating | Human Body Model ≥2000 V - meets industrial I/O port robustness requirements without external protection. |
Pinout & Package
SN74ALVC245DWE4 is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm footprint, 2.65 mm max height, with gull-wing leads and JEDEC MO-153 compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B data flow; Low = B→A data flow - determines real-time bus direction without clock or state machine. |
| 2–9 (A1–A8) | Port A Data Inputs/Outputs | Bidirectional I/O pins connected to source bus; high-impedance when OE = high or power-down. |
| 10 (GND) | Ground Reference | Primary return path for all I/O and supply currents; must be low-inductance connection to minimize ground bounce. |
| 11 (VCC) | Power Supply | Single 1.65–3.6-V supply powering both input and output stages - no separate I/O or core rails required. |
| 12 (OE) | Output Enable Input | Active-low control: OE = low enables transceiver; OE = high forces all A/B pins into high-impedance state. |
| 13–20 (B1–B8) | Port B Data Inputs/Outputs | Bidirectional I/O pins connected to destination bus; electrically isolated from A-side when OE = high. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Bus Translation | Supports seamless data flow between mismatched voltage domains (e.g., 1.8-V microcontroller ↔ 3.3-V peripheral) using single-supply operation. |
| High-Drive 3-State Outputs | ±24-mA sink/source capability at 3.3 V allows direct interface to terminated lines or fan-out to ≥10 CMOS loads without buffers. |
| Fast Switching Performance | 3.4-ns tpd and sub-6-ns enable/disable times reduce bus turnaround latency in time-critical protocols like SPI multiplexing or memory-mapped I/O. |
| Latch-Up Immunity | Exceeds 250 mA per JESD 17 - eliminates need for external current-limiting resistors in noisy industrial environments. |
| Low Dynamic Power | 30-pF typical power dissipation capacitance at 10 MHz - reduces system-level heat generation and EMI in dense PCB layouts. |
Applications
| Industrial PLC Backplane Interface | FPGA I/O Expansion Bridge |
|---|---|
Use Scenario: Connecting legacy 5-V or 3.3-V fieldbus modules to modern 1.8-V FPGA-based controller cards in programmable logic controllers. IC Role / Device Role / Timing Role: Level-translating octal transceiver managing bidirectional register read/write cycles between FPGA fabric and external peripherals. Use Value: Eliminates discrete level-shifter arrays; enables single-rail 3.3-V operation while maintaining compatibility with older 5-V tolerant devices via VCC = 3.3 V and VIH/VIL thresholds. |
Use Scenario: Extending limited FPGA GPIO count to drive multiple sensor interfaces, display segments, or configuration EEPROMs in edge AI gateways. IC Role / Device Role / Timing Role: Bidirectional data shuttle synchronizing burst-mode transfers between FPGA parallel bus and external memory-mapped peripherals. Use Value: Provides deterministic 3.4-ns propagation delay and sub-6-ns 3-state control - essential for meeting setup/hold timing in 50-MHz parallel address/data buses. |
| Embedded Microcontroller Bus Multiplexer | USB-to-Parallel Protocol Adapter |
Use Scenario: Sharing a single microcontroller parallel bus among multiple peripherals (LCD, keypad, ADC) using DIR/OE-controlled time-division access. IC Role / Device Role / Timing Role: Isolating and routing data under software-controlled DIR and hardware-gated OE signals to prevent bus contention. Use Value: Enables zero-latency bus arbitration with no added clock domain crossing logic; OE-driven high-Z state guarantees safe hot-plug capability. |
Use Scenario: Converting USB-host-initiated parallel printer commands into synchronized strobe/data handshaking for legacy parallel port peripherals. IC Role / Device Role / Timing Role: Transceiver buffering and direction management for IEEE 1284-compliant bidirectional data bursts. Use Value: ±24-mA drive strength ensures reliable signal integrity over 2-m cable runs; 1.65–3.6-V range matches USB PHY I/O voltage specs. |
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 | Lower drive (±24 mA only at 3.3 V; drops to ±12 mA at 2.5 V); identical pinout and logic function. | Less suitable for driving long traces or heavy capacitive loads below 3.3 V; otherwise drop-in compatible. | Select SN74LVC245A only if operating exclusively at 3.3 V and cost is primary constraint. |
| 74AVC245 | Wider VCC range (1.2–3.6 V); faster tpd (2.5 ns typ at 3.3 V); requires external VCC decoupling due to higher di/dt. | Better for ultra-low-voltage SoC interfaces (1.2–1.5 V), but increased layout sensitivity to supply noise. | Choose 74AVC245 when interfacing with sub-1.8-V processors and board-level noise control is assured. |
Compared with SN74LVC245A and 74AVC245, the SN74ALVC245DWE4 delivers balanced performance across 1.65–3.6 V with proven industrial latch-up immunity and SOIC-20 thermal reliability - making it optimal for mixed-voltage embedded systems where robustness and design simplicity are prioritized over marginal speed gains.
Availability
SN74ALVC245DWE4 is available at Aetrix Electronics and suitable for industrial automation interfaces, FPGA I/O expansion, embedded microcontroller bus multiplexing, and USB-to-parallel protocol adapters requiring stable component supply and long-term manufacturability.
Supply support for SN74ALVC245DWE4 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 connectivity technologies, with decades of experience in logic interface solutions.
The SN74ALVC245DWE4 belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered for low-power, high-speed bidirectional bus interfacing in mixed-voltage industrial and communications systems.
FAQ
What is the recommended power-up sequence for SN74ALVC245DWE4?
TI recommends tying OE to VCC through a pullup resistor during power-up to ensure outputs remain in high-impedance state until valid logic levels stabilize. The minimum resistor value depends on the driver's current-sinking capability; for most microcontrollers, 10-kΩ is sufficient. This prevents bus contention and undefined states during VCC ramp-up, which is critical for reliable initialization of the SN74ALVC245DWE4 in embedded systems.
Can SN74ALVC245DWE4 operate at 1.8 V and interface with 3.3-V devices?
Yes, SN74ALVC245DWE4 supports 1.65–3.6-V operation and is fully compliant with mixed-voltage interfacing. At 1.8 V, its VIH threshold is 0.65×VCC ≈ 1.17 V and VIL is 0.35×VCC ≈ 0.63 V - safely recognizing 3.3-V logic-high signals as valid inputs. Its outputs swing rail-to-rail, so 1.8-V outputs can drive 3.3-V inputs only if those inputs are 1.8-V tolerant; otherwise, external level shifting is required. This behavior is explicitly validated for the SN74ALVC245DWE4 in TI's ALVC family documentation.
What is the thermal resistance (θJA) of SN74ALVC245DWE4 in SOIC-20 package?
The SN74ALVC245DWE4 in SOIC-20 (DW) package has a junction-to-ambient thermal resistance (θJA) of 58°C/W, measured per JESD 51-7 on a standard 1-inch², 2-oz copper PCB with two internal planes. This value assumes no additional heatsinking and defines the maximum allowable power dissipation before exceeding the 125°C junction limit. For continuous 24-mA output operation at 3.3 V, total power remains well below thermal limits - confirming suitability for industrial ambient temperatures up to 85°C.
How does DIR and OE interact to control data flow in SN74ALVC245DWE4?
In SN74ALVC245DWE4, OE is priority-enabled: when OE = high, all A and B pins enter high-impedance regardless of DIR state. When OE = low, DIR determines direction - DIR = high enables A→B transfer; DIR = low enables B→A transfer. This hierarchical control allows independent bus isolation (via OE) and directional routing (via DIR), enabling flexible arbitration schemes in multi-master systems. TI's functional table in the SN74ALVC245DWE4 datasheet confirms this exact behavior.
Is SN74ALVC245DWE4 RoHS compliant and lead-free?
Yes, SN74ALVC245DWE4 is RoHS compliant and features NiPdAu (NIPDAU) lead finish, as confirmed in TI's Packaging Information Addendum. It meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) with unlimited floor life at ≤30°C/60% RH, and is rated for peak reflow of 260°C. All active orderable variants - including SN74ALVC245DW, SN74ALVC245DWR, and SN74ALVC245DWE4 - share this environmental compliance profile per TI's official material declarations.
SN74ALVC245DWE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- -
- 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
SN74ALVC245DWE4 FAQ
1.How can I place an order for SN74ALVC245DWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVC245DWE4 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 SN74ALVC245DWE4 reliable?
The price and inventory of SN74ALVC245DWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC245DWE4 is usually 5 days.
3.What payment methods are accepted for SN74ALVC245DWE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVC245DWE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVC245DWE4?
SN74ALVC245DWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVC245DWE4 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 SN74ALVC245DWE4?
For technical support, including SN74ALVC245DWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC245DWE4 requirements.
6.How does Aetrix verify that SN74ALVC245DWE4 is sourced from the original manufacturer or authorized distributors?
All SN74ALVC245DWE4 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 SN74ALVC245DWE4 meets industry standards.
7.What is the process for return or replacement of SN74ALVC245DWE4?
All SN74ALVC245DWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC245DWE4, 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 SN74ALVC245DWE4 part is unused and in its original packaging.
Return procedure for SN74ALVC245DWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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