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Texas Instruments SN74LV245ATNSG4
- Part No.:
- SN74LV245ATNSG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LV245ATNSG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,441
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Product details
Overview
SN74LV245ATNSG4 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 SN74LV245ATNSG4 datasheet, SN74LV245ATNSG4 pinout, SN74LV245ATNSG4 application, or SN74LV245ATNSG4 equivalent, key selection criteria include bidirectional bus isolation timing, mixed-mode voltage tolerance across ports, ground bounce (VOLP < 0.8 V) and undershoot (VOHV > 2.3 V) performance at 5 V, and compatibility with SSOP-20 (NS package) PCB layouts.
Technical Context
The SN74LV245ATNSG4 implements dual-control logic: DIR selects data flow direction (A→B or B→A), while OE independently places all eight channels into high-impedance state. Its CMOS input structure accepts TTL-level signals, and the Ioff circuitry blocks current backflow when VCC = 0, enabling safe hot insertion in powered-backplane systems.
Electrical behavior is specified across –40°C to 125°C, with guaranteed VOL ≤ 0.55 V at IOL = 16 mA and VOH ≥ 3.8 V at IOH = –16 mA under 4.5 V supply. Switching characteristics are characterized at CL = 15 pF and CL = 50 pF, supporting both low-capacitance interconnects and heavier bus loads.
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 droop during transient loading. |
| tpd (Typical) | 3.5 ns at 5 V - enables high-speed bidirectional data transfer in memory buffers and peripheral interfaces. |
| VOLP / VOHV | <0.8 V / >2.3 V at 5 V - suppresses ground bounce and output undershoot, reducing signal integrity risk in dense PCB layouts. |
| Ioff Support | Active at VCC = 0 - prevents damaging current flow during partial power-down, critical for modular system hot-swap compliance. |
| Input Compatibility | TTL-voltage compatible - allows direct interfacing with legacy 5 V TTL outputs without level-shifting circuitry. |
| Operating Temp | –40°C to 125°C - qualified for under-hood automotive, industrial control, and extended-temperature embedded applications. |
| ESD Rating | 2000-V HBM, 1000-V CDM - meets JEDEC JESD22 standards for robust handling in manufacturing and field environments. |
Pinout & Package
SN74LV245ATNSG4 is packaged in SOP-20 (NS package), a surface-mount plastic small-outline package with 20 leads, 0.635 mm pitch, and 7.5 mm × 12.8 mm body dimensions. The package supports standard reflow profiles (MSL Level-1, 260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-low global control: drives all A/B outputs to high-impedance when high; must be pulled up to VCC for power-up isolation. |
| 2–9 (A1–A8) | Port A Data Inputs/Outputs | Bidirectional I/O pins connected to one bus segment; direction determined by DIR state. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output drivers; requires low-inductance PCB connection. |
| 11 (VCC) | Supply Voltage | 4.5–5.5 V power rail; decoupling capacitor (0.1 µF) required within 5 mm of this pin. |
| 12–19 (B1–B8) | Port B Data Inputs/Outputs | Bidirectional I/O pins connected to second bus segment; functionally identical to A-side but electrically isolated. |
| 20 (DIR) | Direction Control | High = A→B data flow; Low = B→A data flow; determines signal propagation path through internal transceiver matrix. |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Bidirectional Operation | Enables real-time data exchange between independent buses without clock synchronization overhead. |
| Mixed-Mode Voltage Support | Allows A and B ports to interface with different logic families (e.g., 3.3 V MCU ↔ 5 V peripheral) while maintaining signal integrity. |
| Low Ground Bounce (VOLP) | Dynamic output ground excursion limited to <0.8 V, minimizing noise coupling into adjacent analog or RF circuits. |
| Partial-Power-Down (Ioff) | Prevents back-current flow when VCC is off, satisfying JEDEC JESD78 latch-up immunity requirements (>250 mA). |
| Wide Temperature Range | Full functionality maintained from –40°C to +125°C, validated per AEC-Q100 stress test conditions for automotive use. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Isolating microcontroller I/O from noisy sensor/actuator bus segments in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing data flow between ARM Cortex-M4 host and isolated CAN/LIN peripheral bus. Use Value: Prevents ground loop interference and enables hot-swappable I/O modules via Ioff-enabled power sequencing. | Use Scenario: Interfacing 3.3 V domain ECUs with legacy 5 V lighting and HVAC subsystems in vehicle body networks. IC Role / Device Role / Timing Role: Level-translating octal transceiver synchronizing door module status updates with central BCM over shared parallel bus. Use Value: Eliminates need for discrete level shifters while meeting automotive EMC requirements via low VOLP/VOHV performance. |
| Embedded Test Equipment Bus Extender | Medical Diagnostic Imaging Subsystem |
Use Scenario: Extending FPGA-based pattern generator outputs to multiple DUT interface cards in automated test systems. IC Role / Device Role / Timing Role: High-speed bidirectional buffer isolating test controller from variable capacitive loads of modular probe fixtures. Use Value: Maintains 3.5 ns tpd margin across 50 pF loads, ensuring deterministic timing alignment across 8-channel parallel stimulus paths. | Use Scenario: Connecting radiation-hardened ADC front-end to FPGA processing unit in portable ultrasound imaging devices. IC Role / Device Role / Timing Role: Radiation-tolerant bus isolator transferring digitized RF echo data while suppressing switching noise from digital power domains. Use Value: Achieves <0.8 V VOLP under burst-mode operation, preventing false triggering in sensitive analog acquisition stages. |
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 | Lower VCC range (1.65–3.6 V); no Ioff; 3.3 V only operation. | Suitable for modern low-voltage embedded systems but incompatible with 5 V buses or hot-swap scenarios. | Select SN74LVC245A only if entire system operates at ≤3.6 V and partial-power-down is not required. |
| 74ACT245 | Higher drive strength (±24 mA); 4.5–5.5 V compatible; no Ioff; higher ICC (20 µA vs. 2 µA typical). | Better for driving heavy capacitive loads but lacks Ioff protection and consumes more quiescent power. | Choose 74ACT245 when fanout exceeds 15 pF and thermal budget permits higher static current. |
Compared with SN74LV245ATNSG4, SN74LVC245A offers lower voltage operation but sacrifices 5 V compatibility and Ioff safety, while 74ACT245 delivers stronger drive at the cost of higher power and no partial-power-down capability - making SN74LV245ATNSG4 optimal for mixed-voltage, hot-pluggable 5 V systems.
Availability
SN74LV245ATNSG4 is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, automotive body control modules, and embedded test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LV245ATNSG4 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 high-reliability logic and interface solutions.
The SN74LV245ATNSG4 belongs to TI's LV family of low-voltage, high-speed logic devices, engineered specifically for robust bidirectional bus isolation in automotive, industrial, and instrumentation applications demanding wide temperature operation and Ioff safety.
FAQ
What is the maximum operating temperature for SN74LV245ATNSG4?
The SN74LV245ATNSG4 is fully specified from –40°C to +125°C, with electrical parameters guaranteed across this full range per the SCLS605D datasheet revision D. This rating qualifies it for under-hood automotive and industrial control applications where ambient temperatures exceed 85°C.
Does SN74LV245ATNSG4 support 3.3 V logic levels on its A or B ports?
Yes, SN74LV245ATNSG4 supports mixed-mode voltage operation: its inputs accept 3.3 V logic levels (VIH = 2 V min, VIL = 0.8 V max), and outputs drive to valid 3.3 V logic thresholds when VCC = 3.3 V - though SN74LV245ATNSG4 is rated for 4.5–5.5 V VCC only, so external level translation is required for true 3.3 V operation.
How should OE and DIR be biased during power-up to ensure safe startup?
To guarantee high-impedance outputs at power-on, OE must be tied to VCC via a pullup resistor (minimum value determined by driver sink capability), and DIR may be left floating or pulled to a defined state. The SN74LV245ATNSG4 datasheet explicitly recommends this OE pullup to prevent bus contention during VCC ramp.
Is SN74LV245ATNSG4 pin-compatible with older 74LS245 devices?
No, SN74LV245ATNSG4 is not pin-compatible with 74LS245: while both are 20-pin octal transceivers, SN74LV245ATNSG4 uses SOP-20 (NS) packaging with different pin assignments (e.g., DIR on pin 20, OE on pin 1), whereas 74LS245 typically uses DIP-20 or SOIC-20 with OE on pin 1 and DIR on pin 2. Layout redesign is required.
What is the purpose of the Ioff feature in SN74LV245ATNSG4?
The Ioff feature in SN74LV245ATNSG4 disables all outputs when VCC = 0 V, blocking current backflow from live buses into the unpowered device. This protects against damage during hot-swap events and satisfies JEDEC JESD78 latch-up immunity requirements, making SN74LV245ATNSG4 suitable for modular backplane architectures.
SN74LV245ATNSG4 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
SN74LV245ATNSG4 FAQ
1.How can I place an order for SN74LV245ATNSG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245ATNSG4 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 SN74LV245ATNSG4 reliable?
The price and inventory of SN74LV245ATNSG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245ATNSG4 is usually 5 days.
3.What payment methods are accepted for SN74LV245ATNSG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV245ATNSG4 transactions.
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4.How is shipping managed for SN74LV245ATNSG4?
SN74LV245ATNSG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245ATNSG4 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 SN74LV245ATNSG4?
For technical support, including SN74LV245ATNSG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245ATNSG4 requirements.
6.How does Aetrix verify that SN74LV245ATNSG4 is sourced from the original manufacturer or authorized distributors?
All SN74LV245ATNSG4 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 SN74LV245ATNSG4 meets industry standards.
7.What is the process for return or replacement of SN74LV245ATNSG4?
All SN74LV245ATNSG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245ATNSG4, 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 SN74LV245ATNSG4 part is unused and in its original packaging.
Return procedure for SN74LV245ATNSG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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