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Texas Instruments SN74LV245ATNS
- Part No.:
- SN74LV245ATNS
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LV245ATNS.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,755
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Product details
Overview
SN74LV245ATNS from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous two-way data communication between A and B buses in 4.5–5.5 V systems. It features direction control (DIR), output enable (OE), 3.5 ns typical propagation delay at 5 V, TTL-voltage-compatible inputs, and Ioff partial-power-down support.
For engineers reviewing the SN74LV245ATNS datasheet, SN74LV245ATNS pinout, SN74LV245ATNS application, or SN74LV245ATNS equivalent, this page delivers verified electrical specs, package mapping to SOP-20 (NS), functional truth table behavior, noise performance metrics (VOLP < 0.8 V, VOHV > 2.3 V), and real-world isolation use cases in mixed-voltage bus interfacing.
Technical Context
The SN74LV245ATNS implements dual-directional 8-bit data flow controlled by DIR: logic low enables B→A transmission, high enables A→B. OE independently places all outputs in high-impedance state, enabling bus isolation without affecting internal logic states.
Its Ioff circuitry actively disables outputs during power-down, preventing backflow current when VCC = 0 V while ports remain biased at 0–5.5 V. Input thresholds (VIH = 2 V, VIL = 0.8 V) ensure robust TTL-level compatibility across –40°C to 125°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - supports stable operation across industrial-grade supply variation and brown-out resilience. |
| tpd (Typical) | 3.5 ns at 5 V - enables high-speed inter-bus handshaking in real-time control and data acquisition systems. |
| VOLP / VOHV | <0.8 V / >2.3 V at 5 V - minimizes ground bounce and undershoot, critical for signal integrity in dense PCB layouts. |
| Ioff Current | <5 μA at 0–5.5 V - guarantees safe partial-power-down in hot-swap and modular subsystem designs. |
| Operating Temp | –40°C to 125°C - qualified for under-hood automotive, industrial PLC, and extended-temperature embedded applications. |
| Input Compatibility | TTL-voltage - accepts standard 0/5 V logic levels without level-shifting, simplifying legacy interface integration. |
| Output Drive | ±16 mA - sufficient to drive 50 pF loads with ≤9.7 ns max tPLH/tPHL, supporting moderate fanout without buffers. |
Pinout & Package
SOP-20 (NS) package: 12.8 mm × 7.5 mm body, 1.27 mm pitch, gull-wing leads, 2.65 mm max height, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-low global control: drives all A/B outputs to high-Z when high; ties to VCC via pullup for power-up safety. |
| 2 (DIR) | Direction Control | Defines data flow path: low = B→A, high = A→B; no internal pullup/pulldown - must be driven externally. |
| 3–10 (A1–A8) | A-Side Data Inputs/Outputs | Bidirectional port A; high-impedance when OE = high or device powered down (Ioff active). |
| 11 (GND) | Ground Reference | Primary return path for all I/O and supply currents; requires low-inductance PCB connection near device. |
| 12–19 (B1–B8) | B-Side Data Inputs/Outputs | Bidirectional port B; electrically identical to A-side with independent 3-state control per channel. |
| 20 (VCC) | Power Supply | 4.5–5.5 V supply input; decoupling capacitor (0.1 μF ceramic) required within 5 mm of pin per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage operation | Supports A/B ports at different logic levels (e.g., 3.3 V MCU ↔ 5 V peripheral) without external level shifters. |
| Ioff partial-power-down | Prevents damaging current flow when VCC = 0 V but A/B lines remain live - essential for hot-plug and modular backplanes. |
| Low ground bounce (VOLP) | <0.8 V at 5 V ensures clean low-state transitions even under heavy capacitive loading, reducing EMI risk. |
| Latch-up immunity | >250 mA per JESD17 - eliminates destructive latch-up failure in noisy industrial environments with transient coupling. |
| ESD robustness | 2000-V HBM / 1000-V CDM - withstands handling and system-level ESD events without protection diodes. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Isolating microcontroller GPIO banks from higher-voltage sensor/actuator buses in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional data bridge between 3.3 V ARM core and 5 V CAN/LIN transceiver peripherals with direction arbitration. Use Value: Eliminates need for discrete level shifters and reduces BOM count while maintaining 3.5 ns timing margin for cycle-accurate I/O sampling. |
Use Scenario: Enabling dynamic reconfiguration of door module ECUs by routing diagnostic data between infotainment head unit and LIN slave nodes. IC Role / Device Role / Timing Role: Controlled bus transceiver managing bidirectional UDS diagnostic traffic over shared wiring harnesses. Use Value: Ioff protection prevents battery drain during sleep mode; 125°C rating ensures reliability in engine bay proximity installations. |
| Test Equipment Signal Routing | Legacy System Upgrade Adapter |
|
Use Scenario: Switching DUT signals between multiple instrument channels in automated test fixtures with minimal crosstalk. IC Role / Device Role / Timing Role: High-speed 3-state multiplexer replacing mechanical relays for sub-10 ns signal path switching. Use Value: 9.7 ns max disable time (tPZH) enables precise timing control; VOLP/VOHV specs guarantee waveform fidelity up to 50 MHz. |
Use Scenario: Interfacing modern FPGA-based controllers with legacy 5 V parallel bus peripherals (e.g., EPROM, DACs) in avionics upgrades. IC Role / Device Role / Timing Role: Voltage-tolerant bus translator preserving original timing budgets during hardware refresh cycles. Use Value: TTL-compatible inputs accept legacy 5 V logic swings; 4.5–5.5 V VCC range matches aging power supplies without regulation changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | Wider VCC range (1.65–3.6 V), lower drive (±24 mA), 3.3 V native logic - no 5 V tolerance on inputs/outputs. | Requires level shifting for 5 V systems; suited for low-voltage portable or battery-powered designs only. | Select only if migrating fully to 3.3 V infrastructure; not drop-in for existing 5 V SN74LV245ATNS designs. |
| 74ACT245 | Higher speed (2.5 ns tpd), 5 V-only operation, no Ioff, higher ICC (40 μA vs. 2 μA), no mixed-voltage support. | Lacks partial-power-down capability and fails latch-up testing beyond JESD17 limits. | Use where absolute minimum propagation delay is critical and power sequencing is tightly controlled; avoid in hot-swap or mixed-rail systems. |
Compared with SN74LV245ATNS, SN74LVC245A offers lower voltage operation but sacrifices 5 V interoperability, while 74ACT245 delivers faster timing at the cost of thermal and safety margins - making SN74LV245ATNS the balanced choice for industrial 5 V bus isolation with robustness and flexibility.
Availability
SN74LV245ATNS is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and test equipment requiring stable component supply with guaranteed long-term sourcing and full traceability.
Supply support for SN74LV245ATNS 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 industrial and automotive ICs.
The SN74LV245ATNS belongs to TI's LV-A family of low-voltage, high-speed logic devices engineered for robust 5 V bus interfacing in harsh environments with extended temperature and ESD requirements.
FAQ
What is the maximum operating temperature for SN74LV245ATNS?
The SN74LV245ATNS is rated for continuous operation from –40°C to +125°C, meeting extended temperature requirements for under-hood automotive and industrial control applications. This specification is validated per JEDEC JESD22-A108 and confirmed in the SCLS605D datasheet revision D (July 2013).
Does SN74LV245ATNS support true 5 V TTL input compatibility?
Yes, SN74LV245ATNS explicitly supports TTL-voltage-compatible inputs: VIH = 2 V min and VIL = 0.8 V max across 4.5–5.5 V VCC, allowing direct connection to legacy 5 V TTL outputs without level translation or external biasing networks.
How does the Ioff feature function in SN74LV245ATNS during power-down?
In SN74LV245ATNS, the Ioff circuitry disables all outputs when VCC = 0 V, limiting leakage to <5 μA even if A/B port voltages range from 0 to 5.5 V - preventing backflow current that could damage upstream drivers or disrupt adjacent powered subsystems.
What is the recommended decoupling for SN74LV245ATNS?
Texas Instruments specifies a 0.1 μF ceramic capacitor placed within 5 mm of the VCC pin (pin 20) and GND pin (pin 11) for SN74LV245ATNS. Additional bulk capacitance (e.g., 4.7 μF tantalum) is advised per board section per SCLS605D layout guidelines.
Is SN74LV245ATNS pin-compatible with other packages of the same part number?
Yes - all SN74LV245AT variants (DB, DGV, DW, NS, PW, RGY) share identical 20-pin functionality and signal mapping per the logic diagram and pinout tables in SCLS605D; only mechanical dimensions, thermal resistance, and soldering profiles differ between SOP-20 (NS), TSSOP-20 (PW), and VQFN-20 (RGY) packages.
SN74LV245ATNS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 16mA, 16mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74LV245ATNS FAQ
1.How can I place an order for SN74LV245ATNS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245ATNS 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 SN74LV245ATNS reliable?
The price and inventory of SN74LV245ATNS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245ATNS is usually 5 days.
3.What payment methods are accepted for SN74LV245ATNS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV245ATNS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV245ATNS?
SN74LV245ATNS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245ATNS 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 SN74LV245ATNS?
For technical support, including SN74LV245ATNS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245ATNS requirements.
6.How does Aetrix verify that SN74LV245ATNS is sourced from the original manufacturer or authorized distributors?
All SN74LV245ATNS 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 SN74LV245ATNS meets industry standards.
7.What is the process for return or replacement of SN74LV245ATNS?
All SN74LV245ATNS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245ATNS, 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 SN74LV245ATNS part is unused and in its original packaging.
Return procedure for SN74LV245ATNS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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