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Texas Instruments SN74LV245ATNSE4
- Part No.:
- SN74LV245ATNSE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LV245ATNSE4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,306
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Product details
Overview
SN74LV245AT 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), TTL-compatible inputs, 3.5 ns typical propagation delay at 5 V, and Ioff support for partial-power-down mode.
For engineers reviewing the SN74LV245AT datasheet, SN74LV245AT pinout, SN74LV245AT application, or SN74LV245AT equivalent, this device is selected for bidirectional level-shifting, bus isolation, and mixed-mode voltage interfacing in industrial control, embedded computing, and legacy peripheral bridging where low skew and robust 3-state control are required.
Technical Context
The SN74LV245AT implements dual-bus bidirectional data flow controlled by a single DIR input: logic low enables B→A transmission, high enables A→B. OE independently places all eight channels into high-impedance state, isolating both buses. Its architecture supports simultaneous use of all eight channels without internal contention.
It operates across –40°C to 125°C with guaranteed 4.5–5.5 V supply range, includes Ioff circuitry to block current backflow during power-down, and meets JESD 17 latch-up (>250 mA) and JESD 22 ESD standards (2000-V HBM, 1000-V CDM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V logic rails and tolerates supply ripple without functional loss. |
| tpd (Typical) | 3.5 ns at 5 V - enables high-speed data transfer in timing-critical bus interfaces such as memory expansion or FPGA-to-peripheral links. |
| Ioff Support | Active at VCC = 0 V - prevents damaging current flow when one bus is powered and the other is not, critical for hot-swap and partial-power-down systems. |
| VOH / VOL | ≥3.8 V / ≤0.55 V at IO = ±16 mA - delivers rail-aligned logic levels under full load, ensuring noise margin and interoperability with downstream CMOS/TTL inputs. |
| Input Compatibility | TTL-voltage compatible - accepts standard 0.8 V/2.0 V VIH/VIL thresholds, allowing direct connection to legacy 5 V TTL outputs without level shifters. |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive, industrial PLC, and extended-temperature embedded applications. |
| ESD Rating | 2000-V HBM, 1000-V CDM - exceeds JEDEC requirements for handling and board-level robustness in manufacturing and field environments. |
Pinout & Package
SN74LV245AT is available in multiple surface-mount packages: SSOP (DB), TVSOP (DGV), SOIC (DW), SOP (NS), TSSOP (PW), and VQFN (RGY), all with 20-pin configuration and identical pin function mapping. The RGY package includes an exposed thermal pad requiring solder attachment for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19, 18, 17, 16, 15, 14, 13 | B1–B8 | Bus B data terminals - bidirectional I/O pins connected to B-side system bus; driven or sensed depending on DIR state. |
| 2, 3, 4, 5, 6, 7, 8, 9 | A1–A8 | Bus A data terminals - bidirectional I/O pins connected to A-side system bus; mirror functionality of B pins under DIR control. |
| 10 | GND | Ground reference - must be low-impedance connection to system ground plane to maintain signal integrity and noise immunity. |
| 20 | VCC | Power supply - supplies core logic and I/O buffers; requires local 0.1 µF ceramic decoupling adjacent to pin. |
| 11 | OE | Output enable - active-low control; when high, all A/B pins enter high-impedance state, electrically isolating both buses. |
| 12 | DIR | Direction control - determines data flow direction: low = B→A, high = A→B; synchronous with OE for clean bus handover. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage operation | Supports interfacing between 3.3 V and 5 V buses on A and B ports simultaneously - eliminates need for external level translators in heterogeneous systems. |
| Low ground bounce (VOLP) | <0.8 V at VCC = 5 V - minimizes switching noise on shared ground paths, preserving signal integrity in dense PCB layouts. |
| Controlled undershoot (VOHV) | >2.3 V at VCC = 5 V - prevents false triggering of downstream receivers during fast edge transitions. |
| Power-down isolation (Ioff) | Leakage <5 µA at 0 V VCC - blocks reverse current flow when device is unpowered, protecting live buses and preventing system-level latch-up. |
| Latch-up immunity | >250 mA per JESD 17 - withstands transient overcurrent events without destructive latch-up, enhancing field reliability. |
Applications
| Industrial PLC Backplane Interface | FPGA-to-Legacy Peripheral Bridge |
|---|---|
|
Use Scenario: Connecting a modern FPGA-based controller to legacy 5 V parallel I/O modules via a shared backplane bus. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing data flow between FPGA's 3.3 V I/O bank and 5 V peripheral registers under DIR-controlled direction and OE-gated isolation. Use Value: Enables seamless integration without external level shifters; Ioff prevents backfeed when FPGA is reset while peripherals remain powered. |
Use Scenario: Interfacing a microcontroller with 5 V parallel LCD controller and keyboard matrix in a medical display unit. IC Role / Device Role / Timing Role: Octal transceiver providing isolated, direction-controlled data path between MCU and display subsystem, with OE used for bus arbitration. Use Value: 3.5 ns tpd ensures pixel clock alignment; TTL-compatible inputs accept direct connection to 5 V keypad scan outputs. |
| Automotive Body Control Module | Test Equipment Signal Routing |
|
Use Scenario: Isolating diagnostic CAN interface logic from 5 V sensor bus in under-hood body control unit operating at 125°C ambient. IC Role / Device Role / Timing Role: Bus isolator enabling safe read/write access to sensor registers while maintaining electrical separation from CAN PHY domain. Use Value: Extended temperature rating (–40°C to 125°C) and 250 mA latch-up immunity ensure long-term reliability in harsh automotive environments. |
Use Scenario: Configurable signal routing between DUT port banks and measurement instruments in automated test equipment. IC Role / Device Role / Timing Role: Reconfigurable 8-bit bus switch controlled by test sequencer via DIR/OE, supporting multi-DUT parallel testing. Use Value: High-impedance isolation (IOZ <2.5 µA) prevents crosstalk between test channels; fast enable/disable (<9.7 ns tPZH) supports rapid test vector switching. |
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 | Wider VCC range (1.65–3.6 V), lower drive strength (±24 mA), no 5 V tolerance on inputs. | Optimized for 3.3 V-only systems; cannot interface directly to 5 V buses without external translation. | Select SN74LVC245A only for pure 3.3 V domains requiring lower power and smaller footprint; avoid for mixed-voltage or 5 V legacy interfaces. |
| 74ACT245 | Higher speed (tpd ≈ 2.5 ns), higher drive (±24 mA), but no Ioff or extended temperature rating (–40°C to 85°C only). | Suitable for high-speed lab equipment or non-automotive industrial boards where partial-power-down is not required. | Choose 74ACT245 when maximum speed is critical and thermal/power constraints allow; SN74LV245AT remains preferred for automotive, hot-swap, or wide-temp designs. |
Compared with SN74LVC245A and 74ACT245, the SN74LV245AT uniquely combines 5 V tolerance, Ioff-enabled partial-power-down, and 125°C operation-making it the only option among the three qualified for automotive body control and industrial systems requiring robust mixed-voltage isolation.
Availability
SN74LV245AT is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and FPGA peripheral bridges requiring stable component supply across extended temperature ranges and mixed-voltage environments.
Supply support for SN74LV245AT 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, automotive, and communications markets.
The SN74LV245AT belongs to TI's LV family of low-voltage, 5 V-tolerant logic devices engineered for reliable bidirectional bus interfacing in mixed-signal systems demanding robustness, wide temperature operation, and power-down safety.
FAQ
What is the recommended pull-up resistor value for OE on SN74LV245AT during power-up?
The SN74LV245AT datasheet specifies that OE should be tied to VCC through a pull-up resistor to ensure high-impedance state at power-up. Minimum resistor value depends on driver sink capability; for standard CMOS drivers, 10 kΩ is typical. The SN74LV245AT itself draws negligible current at OE, so values from 4.7 kΩ to 100 kΩ are commonly used without affecting functionality.
Does SN74LV245AT support true 5 V operation on both A and B ports simultaneously?
Yes, the SN74LV245AT supports true 5 V operation on both A and B ports. Its inputs are TTL-voltage compatible up to 5.5 V, and outputs deliver VOH ≥3.8 V and VOL ≤0.55 V at ±16 mA under 4.5–5.5 V VCC - enabling direct 5 V bus-to-bus communication without level translation.
Can SN74LV245AT be used for unidirectional data transfer only?
Yes, SN74LV245AT can operate unidirectionally: fix DIR to logic high for A→B only, or low for B→A only. OE retains independent control for 3-state isolation. This simplifies design in applications like memory address/data latching where direction is static but bus release is needed.
What is the thermal pad requirement for SN74LV245AT in RGY (VQFN) package?
The SN74LV245AT in RGY package includes an exposed thermal pad that must be soldered to a PCB copper pour for mechanical stability and thermal dissipation. TI recommends full solder coverage (≥78% area) and optional thermal vias to inner ground planes. Failure to connect the pad may cause thermal derating or solder joint reliability issues.
How does Ioff functionality behave when VCC = 0 V on SN74LV245AT?
When VCC = 0 V, the Ioff circuitry in SN74LV245AT actively disables all I/O buffers, limiting leakage current to ≤5 µA regardless of voltage applied to A or B pins. This prevents back-current flow into a powered-down section of the system - a key requirement for hot-plug and partial-power-down architectures.
SN74LV245ATNSE4 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
SN74LV245ATNSE4 FAQ
1.How can I place an order for SN74LV245ATNSE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245ATNSE4 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 SN74LV245ATNSE4 reliable?
The price and inventory of SN74LV245ATNSE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245ATNSE4 is usually 5 days.
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Once your SN74LV245ATNSE4 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 SN74LV245ATNSE4?
For technical support, including SN74LV245ATNSE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245ATNSE4 requirements.
6.How does Aetrix verify that SN74LV245ATNSE4 is sourced from the original manufacturer or authorized distributors?
All SN74LV245ATNSE4 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 SN74LV245ATNSE4 meets industry standards.
7.What is the process for return or replacement of SN74LV245ATNSE4?
All SN74LV245ATNSE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245ATNSE4, 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 SN74LV245ATNSE4 part is unused and in its original packaging.
Return procedure for SN74LV245ATNSE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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