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Texas Instruments SN74ALVC245NSR
- Part No.:
- SN74ALVC245NSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALVC245NSR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,831
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Product details
Overview
SN74ALVC245NSR 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 ±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 SN74ALVC245NSR datasheet, SN74ALVC245NSR pinout, SN74ALVC245NSR application, or SN74ALVC245NSR equivalent, key selection factors include voltage translation capability (1.65 V–3.6 V), direction-control logic behavior, 3-state isolation timing (ten/tdis), and SOP-20 package compatibility with legacy PCB layouts.
Technical Context
The SN74ALVC245NSR 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 rail-to-rail input thresholds compatible with both LVTTL and LVCMOS signaling.
It supports hot-insertion tolerance via I/O clamp diodes and exceeds 250 mA latch-up immunity per JESD 17. The device achieves sub-4 ns tpd at 3.3 V while maintaining <10 µA ICC and <10 µA IOZ (high-impedance leakage) under full operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables interoperability between 1.8-V, 2.5-V, and 3.3-V logic domains without external level shifters. |
| Max tpd | 3.4 ns at 3.3 V - Supports high-speed data handshaking in real-time control and memory interface applications. |
| Output Drive | ±24 mA at 3.3 V - Drives standard 50-Ω transmission lines or multiple CMOS loads without signal degradation. |
| IOZ (Hi-Z Leakage) | ±10 µA at 3.6 V - Ensures minimal bus contention during 3-state isolation in shared-data-path systems. |
| Input Thresholds | VIL = 0.35×VCC (min), VIH = 0.65×VCC (min) - Guarantees robust noise margin across full VCC range. |
| Latch-Up Immunity | >250 mA per JESD 17 - Meets industrial-grade reliability requirements for uncontrolled hot-swap scenarios. |
Pinout & Package
SOP-20 (NS) package: 12.8 mm × 7.5 mm body, 1.75 mm height, 0.65 mm lead pitch, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | Determines data flow direction: low = B→A, high = A→B; referenced to VCC/GND. |
| 2–9 (A1–A8) | Port A I/O Terminals | 8-bit bidirectional data bus side A; internally connected to transceiver core with 3-state output drivers. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and I/O current; must be low-impedance connection. |
| 11 (VCC) | Supply Voltage | Single supply input for entire device; decoupling capacitor required within 10 mm of pin. |
| 12 (OE) | Output Enable Input | Active-low control: low enables transceiver, high forces all A/B pins into high-impedance state. |
| 13–20 (B1–B8) | Port B I/O Terminals | 8-bit bidirectional data bus side B; electrically isolated from A-side when OE = high. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Data Routing | Single DIR pin configures 8-channel data path direction without external logic or multiplexing. |
| 3-State Output Isolation | OE input disables both A and B ports simultaneously, enabling true bus arbitration in multi-master systems. |
| Wide VCC Compatibility | Operates across 1.65–3.6 V without configuration changes-ideal for mixed-supply board designs. |
| Low Propagation Delay | 3.4 ns max tpd at 3.3 V allows use in 100+ MHz synchronous bus clock domains with margin. |
| Hot-Insertion Tolerance | Clamp diodes on all I/O pins limit transient overvoltage to ±0.5 V beyond rails, protecting downstream logic. |
Applications
| Industrial PLC Backplane Interface | FPGA I/O Expansion Bridge |
|---|---|
Use Scenario: Interfacing a 3.3-V FPGA I/O bank to a 1.8-V microcontroller subsystem in a programmable logic controller. IC Role / Device Role / Timing Role: Bidirectional voltage-level translator and bus isolator, synchronized to system clock edges with sub-4 ns latency. Use Value: Eliminates need for discrete level-shifters or dual-supply buffers while maintaining signal integrity across 1.65–3.6 V domain boundaries. | Use Scenario: Expanding FPGA GPIO count by connecting external peripherals (ADCs, DACs, sensors) operating at different logic voltages. IC Role / Device Role / Timing Role: Configurable 8-bit transceiver enabling dynamic reassignment of FPGA I/O direction per peripheral handshake protocol. Use Value: Reduces FPGA pin utilization and simplifies PCB routing by consolidating bidirectional data paths into one SOP-20 footprint. |
| Automotive Body Control Module | Legacy Embedded System Upgrade |
Use Scenario: Integrating new 2.5-V CAN controller into existing 3.3-V MCU-based body control module with shared data bus. IC Role / Device Role / Timing Role: Asynchronous bus transceiver managing data exchange between MCU and CAN PHY, with OE-controlled isolation during fault recovery. Use Value: Provides galvanically isolated data coupling without optocouplers, meeting automotive EMC and thermal requirements in compact SOP-20 layout. | Use Scenario: Upgrading aging 5-V industrial controller to modern 3.3-V logic while retaining legacy 20-pin SOIC footprints on production PCBs. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement for obsolete 74LS245, supporting same board layout with lower power and higher speed. Use Value: Enables direct migration from TTL to ALVC logic without redesign-reducing NRE cost and time-to-market for legacy product refresh. |
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 | Same functionality but TSSOP-20 (PW) package; 83°C/W θJA vs. NS package's 60°C/W. | Higher thermal resistance limits continuous operation in high-density layouts without airflow. | Prefer SN74ALVC245NSR for thermally constrained SOP-20 designs requiring lower junction rise. |
| 74AVC245TTR | STMicroelectronics part with identical pinout and 1.2–3.6 V range; 3.6 ns tpd (vs. 3.4 ns) and ±24 mA drive. | Qualified to AEC-Q100 Grade 2; suitable for automotive ambient temperature ranges up to 105°C. | Choose 74AVC245TTR only if extended temperature qualification is mandatory; otherwise SN74ALVC245NSR offers tighter timing. |
Compared with SN74LVC245APW and 74AVC245TTR, the SN74ALVC245NSR delivers the lowest propagation delay in SOP-20 packaging and superior thermal performance for space-constrained industrial control boards.
Availability
SN74ALVC245NSR is available at Aetrix Electronics and suitable for industrial automation, FPGA interface design, and automotive body electronics requiring stable component supply and long-term manufacturing continuity.
Supply support for SN74ALVC245NSR 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 over 50 years of innovation in high-reliability logic and interface solutions.
The SN74ALVC245NSR belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered for low-power, high-speed bidirectional bus interfacing in mixed-voltage digital systems.
FAQ
What is the maximum operating temperature range for the SN74ALVC245NSR?
The SN74ALVC245NSR is rated for operation from –40°C to +85°C ambient temperature. This range is validated per TI's recommended operating conditions and applies to all electrical specifications including propagation delay, drive strength, and input thresholds. The SOP-20 package's 60°C/W thermal impedance supports reliable operation within this range under typical PCB copper area and still-air conditions. Always verify junction temperature using actual power dissipation and board layout in final design.
Does the SN74ALVC245NSR support hot-plug operation?
Yes, the SN74ALVC245NSR supports hot-plug operation due to built-in I/O clamp diodes that limit input/output voltage excursions to ±0.5 V beyond VCC or GND. Its latch-up immunity exceeding 250 mA per JESD 17 further ensures robustness during uncontrolled insertion. However, OE should be held high (disabled) during plug-in to prevent bus contention, and external pull-up resistors on OE and DIR are recommended for deterministic startup behavior in live-backplane environments.
Can the SN74ALVC245NSR be used for level translation between 1.8-V and 3.3-V buses?
Yes, the SN74ALVC245NSR is explicitly designed for bidirectional level translation between 1.65-V and 3.6-V buses. When VCC = 3.3 V, it accepts 1.8-V logic inputs (VIH min = 2.0 V, VIL max = 0.8 V) and drives 3.3-V outputs; when VCC = 1.8 V, it accepts 3.3-V inputs via its overvoltage-tolerant I/O structure (VI up to VCC + 0.5 V). No external biasing or direction control logic is needed-DIR and OE manage data flow and isolation.
What is the recommended power supply decoupling for the SN74ALVC245NSR?
TI recommends a 0.1-µF ceramic capacitor placed within 10 mm of the SN74ALVC245NSR VCC pin (pin 11) and GND pin (pin 10), with short, low-inductance traces. For systems with high-frequency switching or multiple transceivers, add a bulk 4.7-µF tantalum or aluminum electrolytic capacitor near the power entry point. Avoid shared vias between VCC and GND traces, and ensure the GND plane beneath the SOP-20 footprint is solid and uninterrupted to minimize ground bounce during simultaneous 24-mA output transitions.
Is the SN74ALVC245NSR pin-compatible with older 74-series transceivers like the 74LS245?
No, the SN74ALVC245NSR is not pin-compatible with the 74LS245. While both are 20-pin octal transceivers, the SN74ALVC245NSR uses DIR/OE control logic (active-high DIR, active-low OE), whereas the 74LS245 uses two active-low enable inputs (G1̅/G2̅) and no direction pin. Pin assignments differ: DIR is on pin 1 (74LS245 has A1 on pin 1), and OE is on pin 12 (74LS245 has G2̅ on pin 19). Board redesign is required for replacement, though the SOP-20 footprint is mechanically identical.
SN74ALVC245NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVC
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SO
SN74ALVC245NSR FAQ
1.How can I place an order for SN74ALVC245NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVC245NSR 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 SN74ALVC245NSR reliable?
The price and inventory of SN74ALVC245NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC245NSR is usually 5 days.
3.What payment methods are accepted for SN74ALVC245NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVC245NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVC245NSR?
SN74ALVC245NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVC245NSR 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 SN74ALVC245NSR?
For technical support, including SN74ALVC245NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC245NSR requirements.
6.How does Aetrix verify that SN74ALVC245NSR is sourced from the original manufacturer or authorized distributors?
All SN74ALVC245NSR 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 SN74ALVC245NSR meets industry standards.
7.What is the process for return or replacement of SN74ALVC245NSR?
All SN74ALVC245NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC245NSR, 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 SN74ALVC245NSR part is unused and in its original packaging.
Return procedure for SN74ALVC245NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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