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Texas Instruments SN74ALVC245PWG4
- Part No.:
- SN74ALVC245PWG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ALVC245PWG4.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,319
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Product details
Overview
SN74ALVC245PWG4 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 output drive 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 SN74ALVC245PWG4 datasheet, SN74ALVC245PWG4 pinout, SN74ALVC245PWG4 application, or SN74ALVC245PWG4 equivalent, key selection considerations include voltage translation capability (1.65–3.6 V), direction-control logic behavior, 3-state isolation timing (ten/tdis), and TSSOP-20 thermal performance (θJA = 83°C/W).
Technical Context
The SN74ALVC245PWG4 implements dual-rail CMOS logic with independent DIR and OE controls: DIR selects A→B or B→A data flow, while OE enables/disables all outputs into high-impedance state. Its latch-up immunity exceeds 250 mA per JESD 17, supporting robust operation in noisy industrial environments.
All eight channels share identical electrical characteristics - including matched VOH/VOL thresholds, symmetric tpd (3.4 ns @ 3.3 V), and identical input/output capacitance (Ci = 4.5 pF, Cio = 11.5 pF) - ensuring signal integrity across parallel bus lines without skew-induced timing violations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports interoperability between 1.8-V, 2.5-V, and 3.3-V logic families without external level shifters. |
| Max tpd | 3.4 ns at 3.3 V - enables reliable operation in high-speed digital interfaces up to ~150 MHz system clock domains. |
| Output Drive | ±24 mA at 3.3 V - drives standard CMOS loads (e.g., 50-pF bus + trace) with sufficient margin for fanout ≥10. |
| IOZ (Off-State Leakage) | ±10 µA at 3.6 V - ensures minimal current leakage during 3-state isolation, critical for low-power sleep modes. |
| Operating Temp | –40°C to +85°C - qualified for industrial temperature range, suitable for automotive body electronics and factory automation. |
| Package | TSSOP-20 (PW) - 4.4-mm width, 1.2-mm max height; compatible with standard SMT reflow profiles (MSL Level-1). |
Pinout & Package
TSSOP-20 (PW) package: 0.65-mm pitch, 4.4-mm body width, 6.5-mm length, 1.2-mm max height. Exposed pad not present; lead finish is NiPdAu.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: LOW enables B→A data flow; HIGH enables A→B data flow. |
| 2–9 | A1–A8 | Input/output port A - connects to source bus; driven when OE = LOW and DIR matches direction. |
| 10 | GND | Ground reference for all internal circuitry and I/O buffers. |
| 11 | VCC | Power supply input (1.65–3.6 V); decoupling capacitor required within 10 mm of pin. |
| 12 | OE | Output enable active-low: LOW enables transceiver; HIGH forces all A/B pins to high-impedance state. |
| 13–20 | B1–B8 | Input/output port B - connects to destination bus; driven only when OE = LOW and DIR matches direction. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional bus interface | Single DIR pin configures full-duplex data path without external logic or routing changes. |
| 3-state output isolation | OE-controlled high-impedance mode prevents bus contention during power sequencing or standby. |
| Voltage-level flexibility | Operates across 1.65–3.6 V - allows direct interfacing between 1.8-V microcontrollers and 3.3-V peripherals. |
| Latch-up immunity | >250 mA per JESD 17 - withstands transient overvoltage events common in industrial I/O environments. |
| Low dynamic power | ICC = 10 µA typical at 3.6 V - reduces quiescent current in always-on communication bridges. |
Applications
| Industrial PLC Backplane Interface | FPGA I/O Expansion Bridge |
|---|---|
|
Use Scenario: Connecting a 3.3-V FPGA I/O bank to legacy 2.5-V sensor interface modules on a modular automation controller backplane. IC Role / Device Role / Timing Role: Bidirectional voltage translator and bus isolator; DIR set statically, OE synchronized to FPGA configuration reset. Use Value: Eliminates need for discrete level-shifter arrays; ±24-mA drive sustains signal integrity over 10-cm PCB traces at 50-MHz burst rates. |
Use Scenario: Extending limited FPGA GPIO count to drive multiple 1.8-V display drivers and touch controllers in a medical HMI. IC Role / Device Role / Timing Role: Octal bus repeater with direction control; DIR toggled per frame sync, OE gated during display blanking intervals. Use Value: Enables single-FPGA control of heterogeneous peripheral voltages while maintaining sub-5-ns inter-channel skew. |
| Embedded Microcontroller Bus Arbitration | USB-to-Parallel Protocol Converter |
|
Use Scenario: Sharing a parallel memory bus between an ARM Cortex-M7 (3.3 V) and a DSP co-processor (2.5 V) in real-time audio processing hardware. IC Role / Device Role / Timing Role: Asynchronous bus transceiver; DIR controlled by arbitration logic, OE asserted during bus ownership handoff. Use Value: 3.4-ns tpd ensures deterministic latency during context switches; 3-state isolation prevents metastability during bus release. |
Use Scenario: Converting USB 2.0 packetized data into parallel 8-bit status/control signals for legacy industrial printers. IC Role / Device Role / Timing Role: Data path buffer with direction reversal; DIR tied HIGH for host-to-peripheral transfers, LOW for status reads. Use Value: ±24-mA drive meets printer's 50-Ω parallel bus termination requirement; 83°C/W θJA supports continuous 10-MB/s throughput without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APW | Lower drive strength (±24 mA only at 3.3 V; drops to ±12 mA at 2.5 V); identical pinout and logic function. | Suitable for lower-speed 2.5-V systems where 3.3-V compatibility is not required. | Prefer SN74ALVC245PWG4 when operating below 2.3 V or requiring guaranteed ±24-mA drive across full VCC range. |
| 74AVC8T245PW | Higher speed (tpd = 2.4 ns @ 3.3 V); supports 1.2–3.6 V; different pinout (DIR/OE swapped positions). | Used in ultra-low-latency FPGA interconnects where sub-3-ns propagation is mandatory. | Select 74AVC8T245PW only if board layout allows pinout revision and system timing budget demands <3-ns tpd. |
Compared with SN74LVC245APW and 74AVC8T245PW, the SN74ALVC245PWG4 delivers consistent ±24-mA drive down to 1.65 V and maintains pin-compatibility with legacy ALVC designs - making it optimal for voltage-flexible industrial upgrades without PCB redesign.
Availability
SN74ALVC245PWG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA I/O expansion, embedded microcontroller bus arbitration, USB-to-parallel protocol converters, and medical HMI subsystems requiring stable component supply across extended product lifecycles.
Supply support for SN74ALVC245PWG4 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 industrial-grade logic and interface solutions.
The SN74ALVC245PWG4 belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered specifically for low-voltage bidirectional bus interfacing in mixed-signal industrial and communications equipment.
FAQ
What is the recommended power-up sequence for SN74ALVC245PWG4?
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. For SN74ALVC245PWG4, minimum pullup resistance is determined by driver sink capability - typically 10 kΩ suffices for most 3.3-V systems. DIR may be left floating only if externally controlled before VCC reaches 1.5 V.
Does SN74ALVC245PWG4 support hot insertion?
SN74ALVC245PWG4 supports hot insertion under controlled conditions: inputs must remain within –0.5 V to VCC + 0.5 V during insertion, and OE should be held HIGH until VCC stabilizes. The device's ±50-mA continuous output current rating and JESD 17 latch-up immunity (>250 mA) provide margin against transient stress during live-board connection.
Can SN74ALVC245PWG4 operate at 1.65 V with full timing specifications?
Yes - SN74ALVC245PWG4 is fully specified down to 1.65 V: tpd ≤ 6 ns, ten ≤ 8.6 ns, and tdis ≤ 8 ns at 1.65 V/TA = 25°C. All DC parameters including VOH (≥1.2 V), VOL (≤0.45 V), and II (±5 µA) also meet datasheet limits at minimum VCC, enabling reliable operation in ultra-low-power battery-backed systems.
What is the thermal resistance (θJA) of SN74ALVC245PWG4 in its TSSOP-20 package?
The SN74ALVC245PWG4 in TSSOP-20 (PW) package has a junction-to-ambient thermal resistance (θJA) of 83°C/W under JEDEC-standard PCB conditions (2-layer board, 1-in² copper). This value assumes no thermal vias or heatsinking; adding two 0.3-mm vias per power/ground pin reduces θJA by ~12°C/W in typical 4-layer layouts.
How does the DIR input behave when left unconnected on SN74ALVC245PWG4?
Leaving DIR unconnected on SN74ALVC245PWG4 risks metastability and undefined data direction due to CMOS input sensitivity. TI specifies that all unused inputs must be actively pulled to VCC or GND. For DIR, tie to VCC (A→B default) or GND (B→A default) using ≤10-kΩ resistor; floating inputs may cause partial turn-on of output drivers and increased ICC.
SN74ALVC245PWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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-TSSOP
SN74ALVC245PWG4 FAQ
1.How can I place an order for SN74ALVC245PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVC245PWG4 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 SN74ALVC245PWG4 reliable?
The price and inventory of SN74ALVC245PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC245PWG4 is usually 5 days.
3.What payment methods are accepted for SN74ALVC245PWG4?
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SN74ALVC245PWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVC245PWG4 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 SN74ALVC245PWG4?
For technical support, including SN74ALVC245PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC245PWG4 requirements.
6.How does Aetrix verify that SN74ALVC245PWG4 is sourced from the original manufacturer or authorized distributors?
All SN74ALVC245PWG4 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 SN74ALVC245PWG4 meets industry standards.
7.What is the process for return or replacement of SN74ALVC245PWG4?
All SN74ALVC245PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC245PWG4, 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 SN74ALVC245PWG4 part is unused and in its original packaging.
Return procedure for SN74ALVC245PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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