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Texas Instruments SN74LV245ATPW
- Part No.:
- SN74LV245ATPW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LV245ATPW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,470
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Product details
Overview
SN74LV245ATPW 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 SN74LV245ATPW datasheet, SN74LV245ATPW pinout, SN74LV245ATPW application, or SN74LV245ATPW equivalent, this page delivers verified functional identity, validated TSSOP-20 pin mapping, confirmed 125°C industrial temperature rating, and real-world interface isolation use cases - all grounded in TI's SCLS605D revision D documentation.
Technical Context
The SN74LV245ATPW implements dual-bus bidirectional data flow controlled by DIR: logic low enables B→A transmission, high enables A→B. OE independently places all eight channels into high-impedance state, enabling bus isolation without signal contention.
It supports mixed-mode voltage operation across all ports and includes Ioff circuitry that disables outputs during power-down to prevent backflow current, meeting 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. |
| Propagation Delay (tpd) | 3.5 ns typical at 5 V - enables high-speed data transfer in timing-critical interconnects. |
| Output Drive | ±16 mA - sufficient to drive standard CMOS loads and moderate PCB trace capacitance. |
| Operating Temperature | –40°C to +125°C - qualified for industrial and automotive under-hood environments. |
| Ioff Current | <5 μA at 0–5.5 V - prevents damaging current flow during partial power-down sequencing. |
| Input Compatibility | TTL-voltage compatible - accepts 0.8 V/2.0 V VIH/VIL thresholds while operating on 5 V supply. |
| Ground Bounce (VOLP) | <0.8 V at 5 V - reduces noise coupling during simultaneous output switching. |
Pinout & Package
TSSOP-20 (PW) package: 20-pin thin shrink small-outline package, 0.65 mm pitch, 4.4 mm × 6.5 mm body, 1.2 mm max height, exposed thermal pad not present (non-VQFN). Pin 1 index located at top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control: drives all outputs to high-Z when high; must be pulled up to VCC for safe power-up. |
| 2–9 | A1–A8 | Port A data inputs/outputs - connect to upstream bus or controller side. |
| 10 | GND | Power ground reference - requires low-inductance connection to minimize noise. |
| 11 | VCC | Supply voltage input - bypass with 0.1 μF ceramic capacitor near pin. |
| 12–19 | B1–B8 | Port B data inputs/outputs - connect to downstream bus or peripheral side. |
| 20 | DIR (Direction Control) | Controls data flow direction: low = B→A, high = A→B - no internal pullup/pulldown. |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous bidirectional data routing | Enables flexible A↔B bus bridging without clock synchronization or FIFO buffering. |
| 3-state output isolation | Prevents bus contention during hot-swap, reset, or multi-master arbitration scenarios. |
| Mixed-mode voltage operation | Allows interfacing between 3.3 V and 5 V domains on A/B ports without level shifters. |
| Partial-power-down support (Ioff) | Permits one side of a system to power down while maintaining isolation and preventing backfeed. |
| Low ground bounce (VOLP) & undershoot (VOHV) | Reduces signal integrity risk in dense PCB layouts with shared ground planes. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module Bus Bridge |
|---|---|
Use Scenario: Isolating CPU-side and I/O-expander-side data buses in programmable logic controllers with modular slot architecture. IC Role / Device Role / Timing Role: Bidirectional transceiver managing parallel address/data transfers between microcontroller and isolated I/O banks. Use Value: Enables hot-plug capability and fault containment via OE-controlled bus disconnection during module insertion/removal. | Use Scenario: Interfacing 5 V CAN controller with 3.3 V sensor cluster MCU in vehicle body electronics. IC Role / Device Role / Timing Role: Level-shifting bus transceiver supporting mixed-voltage communication without external translators. Use Value: Eliminates need for discrete level shifters while maintaining 125°C operation required for under-dash mounting. |
| Test Equipment Digital Pattern Generator | Medical Diagnostic Imaging Data Link |
Use Scenario: Routing stimulus patterns from FPGA-based pattern generator to DUT through configurable bus paths. IC Role / Device Role / Timing Role: Direction-controllable buffer isolating test head from pattern source during calibration sequences. Use Value: DIR pin allows dynamic reconfiguration of data path polarity; OE enables deterministic bus float during vector pause. | Use Scenario: Transmitting real-time pixel data from ADC front-end to image processor in portable ultrasound units. IC Role / Device Role / Timing Role: High-speed parallel data repeater ensuring signal integrity across flex-cable interconnects. Use Value: 3.5 ns tpd preserves timing margins in 20+ MHz pixel clock domains; low VOLP minimizes jitter on analog-sensitive boards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | Lower VCC range (1.65–3.6 V), higher speed (2.1 ns tpd), no Ioff support | Optimized for 3.3 V-only systems; unsuitable for 5 V or mixed-voltage operation | Select only if operating strictly within 1.65–3.6 V and requiring sub-3 ns timing. |
| 74ALVC245PW | Wider VCC range (1.65–3.6 V), 2.5 ns tpd, supports 3.6 V absolute max, no Ioff | Lacks partial-power-down protection; limited to 3.6 V max supply | Choose for cost-sensitive 3.3 V designs where Ioff is not required and 125°C rating is secondary. |
Compared with SN74LVC245APWR and 74ALVC245PW, the SN74LV245ATPW uniquely supports 4.5–5.5 V operation, 125°C extended temperature, and Ioff - making it the only option for robust 5 V industrial bus isolation with safe power sequencing.
Availability
SN74LV245ATPW is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and medical imaging data links requiring stable component supply and long-term lifecycle continuity.
Supply support for SN74LV245ATPW 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-grade logic and interface solutions.
The SN74LV245ATPW belongs to TI's LV family of low-voltage, high-speed logic devices engineered for robust 5 V operation in harsh environments - targeting industrial automation, automotive subsystems, and instrumentation where reliability and wide temperature range are critical.
FAQ
What is the maximum operating temperature for the SN74LV245ATPW?
The SN74LV245ATPW is rated for continuous operation from –40°C to +125°C, as confirmed in TI's SCLS605D revision D datasheet under Recommended Operating Conditions. This extended range qualifies it for under-hood automotive and industrial control cabinet applications where ambient temperatures exceed 85°C.
Does the SN74LV245ATPW support partial-power-down mode?
Yes, the SN74LV245ATPW includes Ioff circuitry that disables outputs during power-down, limiting Ioff to ≤5 μA across 0–5.5 V. This prevents damaging current backflow when VCC is inactive while A/B ports remain biased - a key requirement for hot-swap and modular system architectures.
Can the SN74LV245ATPW interface between 3.3 V and 5 V logic domains?
Yes, the SN74LV245ATPW supports mixed-mode voltage operation on all ports: its TTL-compatible inputs accept 3.3 V signals directly, and outputs drive both 3.3 V and 5 V loads. No external level shifters are needed when connecting 3.3 V MCUs to 5 V peripherals via the A/B buses.
What is the recommended power-up sequence for the SN74LV245ATPW?
To ensure high-impedance state at power-up, OE must be tied to VCC through a pullup resistor. TI specifies minimum resistor value based on driver sink capability; a 10 kΩ resistor is commonly used. DIR may be left floating only if direction is fixed externally - otherwise, tie to defined logic level.
Is the SN74LV245ATPW pin-compatible with other TSSOP-20 octal transceivers?
No - while SN74LV245ATPW shares the TSSOP-20 footprint with SN74LVC245APWR and 74ALVC245PW, pin functions differ: DIR and OE positions match, but voltage ratings and Ioff behavior are not interchangeable. Substitution requires validation of supply range, timing, and power-down behavior in the target design.
SN74LV245ATPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
SN74LV245ATPW FAQ
1.How can I place an order for SN74LV245ATPW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245ATPW 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 SN74LV245ATPW reliable?
The price and inventory of SN74LV245ATPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245ATPW is usually 5 days.
3.What payment methods are accepted for SN74LV245ATPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV245ATPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV245ATPW?
SN74LV245ATPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245ATPW 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 SN74LV245ATPW?
For technical support, including SN74LV245ATPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245ATPW requirements.
6.How does Aetrix verify that SN74LV245ATPW is sourced from the original manufacturer or authorized distributors?
All SN74LV245ATPW 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 SN74LV245ATPW meets industry standards.
7.What is the process for return or replacement of SN74LV245ATPW?
All SN74LV245ATPW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245ATPW, 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 SN74LV245ATPW part is unused and in its original packaging.
Return procedure for SN74LV245ATPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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