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Texas Instruments SN74ALVC245NS
- Part No.:
- SN74ALVC245NS
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALVC245NS.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:14,120
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Product details
Overview
SN74ALVC245NS from Texas Instruments is a low-voltage CMOS octal transceiver with 5 V–tolerant inputs and outputs, operating from 1.2 V to 3.6 V supply. It provides bidirectional data flow control between two 8-bit buses via T/R and OE inputs, delivers ±24 mA output drive per port, and supports memory address driving and TTL-level bus interfacing in mixed-voltage systems.
For engineers reviewing the SN74ALVC245NS datasheet, SN74ALVC245NS pinout, SN74ALVC245NS application, or SN74ALVC245NS equivalent, this page details its voltage translation capability, 3-state bus isolation behavior, propagation delay (≤6.3 ns at 3.0–3.6 V), IOFF protection at VCC = 0 V, and compatibility with 5 V logic while powered at ≤3.6 V.
Technical Context
The SN74ALVC245NS implements a non-inverting bidirectional transceiver architecture with separate Transmit/Receive (T/R) and Output Enable (OE) controls. Its dual 8-bit I/O ports (A0–A7 and B0–B7) operate as either inputs or outputs depending on T/R state, while OE forces both sides into high-impedance when HIGH.
It features 5 V–tolerant I/O pins (VI up to 5.5 V), IOFF circuitry ensuring high-impedance during power-down, and rail-to-rail input thresholds defined by VCC-dependent VIH/VIL levels. Propagation delay ranges from 1.0 ns (min) to 8.0 ns (max) across 1.2–3.6 V operation, with output skew ≤1.5 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2 V to 3.6 V - Enables direct interface with 1.2 V, 1.8 V, 2.5 V, and 3.3 V logic domains. |
| Input Voltage Tolerance | −0.5 V to 5.5 V - Allows safe connection to 5 V TTL outputs without level shifters when VCC ≤ 3.6 V. |
| Output Drive Strength | ±24 mA at VCC ≥ 3.0 V - Sufficient to drive standard TTL loads and multiple CMOS inputs on shared buses. |
| Propagation Delay | 1.0 ns (min) to 6.3 ns (max) at VCC = 3.0–3.6 V - Supports high-speed bus transfer up to ~80 MHz under typical loading. |
| IOFF Leakage | ±10 µA max at VCC = 0 V - Prevents back-powering and signal contention during hot-swap or partial power-down. |
| Static Supply Current | 10 µA max (ICC) - Minimizes quiescent power in battery-powered or always-on system nodes. |
| ESD Rating | HBM >2000 V - Provides robust handling margin for board assembly and field service environments. |
Pinout & Package
SN74ALVC245NS is supplied in a 20-pin SOIC package (Case 751D), with 0.300-inch body width and 1.27 mm lead pitch. The package is Pb-free, RoHS-compliant, and rated MSL Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | T/R (Transmit/Receive) | Active-HIGH selects A→B direction; active-LOW enables B→A data flow. |
| 2–9 | A0–A7 | Side-A bidirectional I/O terminals - function as inputs or outputs based on T/R and OE states. |
| 10 | GND | Ground reference for all internal circuitry and I/O signaling. |
| 11–18 | B0–B7 | Side-B bidirectional I/O terminals - mirror A-side behavior under T/R control. |
| 19 | OE (Output Enable) | Active-HIGH disables both A and B ports into high-impedance - essential for bus arbitration. |
| 20 | VCC | Primary power supply input - must be decoupled locally to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| 5 V–tolerant I/O | Enables seamless interconnection between 3.3 V/2.5 V microcontrollers and legacy 5 V peripherals without external translators. |
| IOFF Power-off Protection | Guarantees high-impedance I/O states when VCC = 0 V - critical for live insertion and hot-swap backplane applications. |
| Low Dynamic Power | CPD = 14.4 pF at VCC = 3.0–3.6 V - reduces switching power dissipation in high-frequency bus operations. |
| High Noise Immunity | TTL-compatible outputs and hysteresis-free inputs minimize susceptibility to ground bounce and crosstalk in dense PCB layouts. |
| Latch-up Immunity | Exceeds ±250 mA per JESD78 - ensures robust operation under transient overvoltage or ESD stress conditions. |
Applications
| Memory Address Bus Interface | Industrial PLC Backplane |
|---|---|
|
Use Scenario: Interfacing a 3.3 V ARM Cortex-M7 MCU to a 5 V SRAM module with shared address/data bus. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver managing address latching and data read/write cycles. Use Value: Eliminates need for discrete level shifters while maintaining <6.3 ns propagation delay for timing-critical memory access. |
Use Scenario: Isolating CPU and I/O modules on a modular industrial controller backplane with mixed 2.5 V/3.3 V/5 V subsystems. IC Role / Device Role / Timing Role: Hot-swap-capable bus buffer enabling safe module insertion/removal without disrupting active communication. Use Value: IOFF protection prevents back-driving during power sequencing; ±24 mA drive sustains signal integrity across 15 cm backplane traces. |
| Automotive Body Control Module | Test Equipment Digital I/O Card |
|
Use Scenario: Connecting a 1.8 V automotive microcontroller to 5 V CAN transceivers and sensor interfaces within a BCM. IC Role / Device Role / Timing Role: Voltage-domain bridge for diagnostic bus signals and peripheral configuration lines. Use Value: 5 V tolerance allows direct connection to legacy sensors; −40°C to +125°C rating meets AEC-Q100 Grade 2 requirements. |
Use Scenario: Configurable digital pattern generator/analyzer card supporting multiple DUT voltage standards (1.2 V to 5 V). IC Role / Device Role / Timing Role: Reconfigurable bus transceiver enabling programmable signal direction and voltage domain adaptation. Use Value: OE and T/R control allow dynamic reassignment of I/O banks; low ICC (10 µA) extends calibration stability during idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC245ADTR2G | Same core logic and electrical specs, but in TSSOP-20 (4.4 mm × 6.5 mm) instead of SOIC-20 (7.5 mm × 12.8 mm). | Preferred for space-constrained PCBs; thermal resistance higher (110.7°C/W vs. 65.8°C/W), limiting high-duty-cycle use. | Select when board area is constrained and thermal load remains below 100 mW average. |
| SN74AVC245PWR | Supports 1.2 V to 3.6 V operation but adds AVCMOS-specific features: lower VIL/VOL, tighter tsk(0) (≤0.5 ns), and enhanced drive at 1.2 V (±12 mA). | Better suited for ultra-low-voltage SoC interconnects where sub-1.5 V signaling dominates; not optimized for 5 V tolerance. | Choose for 1.2 V–1.8 V native systems requiring minimal skew and faster edge rates; avoid if 5 V interface is required. |
Compared with 74LVC245ADTR2G and SN74AVC245PWR, the SN74ALVC245NS offers the optimal balance of 5 V tolerance, SOIC mechanical reliability, and proven performance in mixed-voltage industrial and automotive bus architectures - especially where layout simplicity and thermal margin outweigh footprint reduction needs.
Availability
SN74ALVC245NS is available at Aetrix Electronics and suitable for memory address driving, industrial PLC backplanes, automotive body control modules, and test equipment digital I/O cards requiring stable component supply across extended temperature and voltage ranges.
Supply support for SN74ALVC245NS 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 company delivering analog and embedded processing solutions, with leadership in precision analog, power management, and high-reliability logic families.
The SN74ALVC245NS belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered for low-power, high-speed bidirectional bus interfacing in mixed-voltage systems with strict 5 V tolerance and hot-swap safety requirements.
FAQ
What is the maximum input voltage the SN74ALVC245NS can tolerate on its I/O pins?
The SN74ALVC245NS supports DC input voltages from −0.5 V to 5.5 V regardless of VCC level, enabling safe interfacing with 5 V TTL outputs even when powered at 1.2 V to 3.6 V. This 5 V tolerance is explicitly guaranteed in the Absolute Maximum Ratings table and confirmed in the Recommended Operating Conditions section of the datasheet.
Does the SN74ALVC245NS support hot-swap or live-insertion applications?
Yes, the SN74ALVC245NS supports live insertion and withdrawal due to its IOFF specification: when VCC = 0 V, all I/O pins enter a high-impedance state with leakage current limited to ±10 µA. This prevents back-powering and signal contention during partial power-up sequences common in modular backplane systems.
What is the propagation delay of the SN74ALVC245NS at 3.3 V operation?
At VCC = 3.0 V to 3.6 V, the SN74ALVC245NS exhibits a typical propagation delay of 2.9 ns and a maximum of 6.3 ns (An to Bn or Bn to An). This value is measured under standard AC test conditions (CL = 50 pF, tR/tF = 2.5 ns) and applies across the full −40°C to +125°C operating range.
Can the SN74ALVC245NS drive standard TTL loads?
Yes, the SN74ALVC245NS delivers ±24 mA output sink/source current at VCC ≥ 3.0 V, exceeding the ±16 mA requirement for standard TTL fan-out. Its TTL-compatible output voltage levels (VOH ≥ VCC − 0.2 V, VOL ≤ 0.4 V) ensure reliable logic-level recognition by legacy TTL devices.
Is the SN74ALVC245NS pin-compatible with other 74-series octal transceivers?
The SN74ALVC245NS shares the same 20-pin SOIC footprint and pinout as industry-standard 74LVC245A and 74LVCH245A devices, including identical T/R, OE, A0–A7, B0–B7, VCC, and GND assignments. However, voltage ratings and timing parameters differ - verify VCC range and AC specs before substitution.
SN74ALVC245NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVC
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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-SO
SN74ALVC245NS FAQ
1.How can I place an order for SN74ALVC245NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVC245NS 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 SN74ALVC245NS reliable?
The price and inventory of SN74ALVC245NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC245NS is usually 5 days.
3.What payment methods are accepted for SN74ALVC245NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVC245NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVC245NS?
SN74ALVC245NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVC245NS 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 SN74ALVC245NS?
For technical support, including SN74ALVC245NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC245NS requirements.
6.How does Aetrix verify that SN74ALVC245NS is sourced from the original manufacturer or authorized distributors?
All SN74ALVC245NS 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 SN74ALVC245NS meets industry standards.
7.What is the process for return or replacement of SN74ALVC245NS?
All SN74ALVC245NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC245NS, 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 SN74ALVC245NS part is unused and in its original packaging.
Return procedure for SN74ALVC245NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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