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Texas Instruments SN74LV245ATDWR
- Part No.:
- SN74LV245ATDWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LV245ATDWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,995
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Product details
Overview
SN74LV245ATDWR 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 SN74LV245ATDWR datasheet, SN74LV245ATDWR pinout, SN74LV245ATDWR application, or SN74LV245ATDWR equivalent, key selection criteria include bidirectional bus isolation timing, 3-state output drive capability (±16 mA), mixed-mode voltage operation support, and SOIC-20 package compatibility with industrial temperature range (–40°C to 125°C).
Technical Context
This device implements dual-bus bidirectional data routing via a single DIR input that selects transmission direction (A→B or B→A), while OE independently places all eight channels into high-impedance state. The logic diagram confirms noninverting signal path per channel with no internal inversion.
It supports mixed-mode voltage operation across all ports, enabling interface between 3.3-V and 5-V domains when VCC = 5 V. Ioff circuitry actively disables outputs during power-down, preventing backflow current up to ±50 mA per output clamp rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5-V supply tolerances and brown-out margins. |
| tPD (Typ) | 3.5 ns at 5 V - Enables high-speed bus bridging in real-time control and data acquisition systems. |
| IOL / IOH | ±16 mA - Sustains robust drive strength for driving multiple CMOS loads or trace capacitance up to 50 pF. |
| VIH / VIL | 2.0 V / 0.8 V - Guarantees reliable TTL-level input recognition without level-shifting circuitry. |
| Ioff | <5 μA at 0–5.5 V - Prevents damaging current flow during hot-insertion or partial system power-down. |
| Operating Temp | –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 - Meets JEDEC JESD22-A114/A101 for board-level reliability in handling and assembly. |
Pinout & Package
SN74LV245ATDWR is packaged in a 20-pin SOIC (DW) with 1.27 mm pitch, 7.5 mm × 13.3 mm body, 2.65 mm max height, and RoHS-compliant NiPdAu lead finish. Moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-low global control: drives all A/B outputs to high-Z when high; must be pulled up to VCC for power-up safety. |
| 2–9 (A1–A8) | Port A Data Inputs/Outputs | Bi-directional I/O pins connected to A-side bus; direction determined by DIR state. |
| 10 (GND) | Ground Reference | Primary return path for all I/O and supply currents; requires low-impedance PCB plane connection. |
| 11 (DIR) | Direction Control | High = A→B data flow; Low = B→A data flow; no internal pull-up/pull-down - external bias required. |
| 12–19 (B1–B8) | Port B Data Inputs/Outputs | Bi-directional I/O pins connected to B-side bus; functionally identical to A-port but electrically isolated. |
| 20 (VCC) | Supply Voltage | 5-V nominal power rail; decoupling capacitor (0.1 μF ceramic) required within 5 mm of pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | Accepts standard 3.3-V or 5-V logic thresholds without external translators - simplifies mixed-voltage interconnect. |
| Typical VOLP & VOHV | <0.8 V ground bounce and >2.3 V undershoot at 5 V - reduces signal integrity risk in dense PCB layouts. |
| 3-State Output Isolation | Simultaneous high-Z on all 16 I/Os via OE - enables multi-drop bus arbitration and prevents contention during reset. |
| Latch-Up Immunity | >250 mA per JESD17 - ensures robustness against transient overvoltage events in noisy industrial environments. |
| Partial-Power-Down Support | Ioff limits leakage to <5 μA when VCC = 0 - allows safe insertion/removal in live backplane or modular systems. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Bidirectional data exchange between microcontroller (A bus) and sensor/actuator cluster (B bus) across isolated power domains. IC Role / Device Role / Timing Role: Bus transceiver managing synchronous command-response cycles with sub-10 ns timing margin. Use Value: Eliminates need for discrete level shifters and direction logic gates, reducing BOM count and layout area by 3+ components. |
Use Scenario: Interfacing 5-V CAN controller to 3.3-V MCU in door module ECU with shared diagnostic bus. IC Role / Device Role / Timing Role: Voltage-tolerant bidirectional bridge enabling mixed-supply communication without timing skew. Use Value: Supports hot-plug-safe operation via Ioff, preventing latch-up during battery disconnect/reconnect sequences. |
| Test Equipment Signal Routing | Medical Imaging Data Acquisition |
|
Use Scenario: Reconfigurable signal path between FPGA I/O bank and DUT connector in automated test fixture. IC Role / Device Role / Timing Role: Programmable bus isolator controlled by FPGA GPIO to route stimulus/response signals. Use Value: 3.5 ns tPD ensures deterministic timing alignment across 8-bit parallel paths for <100 MHz sampling sync. |
Use Scenario: Transmitting ADC output streams from analog front-end to digital processing unit in portable ultrasound device. IC Role / Device Role / Timing Role: Low-noise, high-Z bus buffer minimizing crosstalk between sensitive analog and noisy digital sections. Use Value: VOLP <0.8 V and VOHV >2.3 V suppress switching noise coupling into 16-bit precision analog signal chains. |
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 (±24 mA); no Ioff; max TA = 125°C. | Optimized for 3.3-V-only systems; lacks 5-V tolerance and partial-power-down protection. | Select when operating exclusively at 3.3 V and requiring higher drive strength without Ioff dependency. |
| 74ALVC245 | Same 1.65–3.6 V range; faster tPD (2.5 ns typ); no Ioff; max TA = 85°C; different AC characteristics. | Suitable for speed-critical 3.3-V designs where industrial temp range and power-down safety are secondary. | Prefer for high-frequency clock distribution or memory interface where propagation delay dominates over thermal spec. |
Compared with SN74LV245ATDWR, SN74LVC245A offers broader low-voltage compatibility but sacrifices 5-V operation and Ioff protection, while 74ALVC245 delivers superior speed at the cost of reduced temperature range and missing partial-power-down capability - making SN74LV245ATDWR uniquely suited for ruggedized 5-V mixed-signal systems requiring fail-safe power sequencing.
Availability
SN74LV245ATDWR is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LV245ATDWR 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 high-reliability IC design.
The SN74LV245ATDWR belongs to TI's LV family of low-voltage, high-speed logic devices engineered for robust 5-V system interfacing with enhanced noise immunity and power-down safety in harsh environments.
FAQ
What is the maximum operating temperature for SN74LV245ATDWR?
The SN74LV245ATDWR is rated for continuous operation from –40°C to +125°C ambient temperature, validated per TI's recommended operating conditions and qualified for automotive under-hood and industrial control applications where thermal stress is critical. This specification applies specifically to the DW package variant as confirmed in the PACKAGE OPTION ADDENDUM.
Does SN74LV245ATDWR support mixed-voltage operation between 3.3-V and 5-V domains?
Yes, SN74LV245ATDWR supports mixed-mode voltage operation on all ports when powered at VCC = 5 V. Its TTL-compatible inputs accept 3.3-V logic levels directly, and outputs drive both 3.3-V and 5-V CMOS loads without external level shifters - a feature explicitly documented in the FEATURES section of the SCLS605D datasheet.
How does the Ioff feature function in SN74LV245ATDWR during power-down?
In SN74LV245ATDWR, the Ioff circuitry disables all outputs when VCC = 0 V, limiting leakage current to ≤5 μA even if signals remain active on A or B ports. This prevents damaging backflow current through the device, enabling safe hot-swap and partial-power-down modes - a capability verified in Electrical Characteristics tables under Ioff test conditions.
What is the recommended PCB layout practice for SN74LV245ATDWR's VCC and GND pins?
TI specifies a 0.1 μF ceramic decoupling capacitor placed within 5 mm of SN74LV245ATDWR's VCC (pin 20) and GND (pin 10), with low-inductance vias to solid ground/power planes. The SOIC-DW package drawing (DW0020A) mandates symmetrical pad geometry and non-solder-mask-defined land patterns to ensure mechanical stability and thermal performance.
Is SN74LV245ATDWR pin-compatible with other members of the SN74LV245A family?
Yes, SN74LV245ATDWR shares identical pinout and functionality with all package variants (DB, DGV, NS, PW, RGY) of the SN74LV245AT family, including matching signal assignments for OE, DIR, A1–A8, B1–B8, VCC, and GND. This uniformity is confirmed in the top-view package diagrams and FUNCTION TABLE of the SCLS605D datasheet.
SN74LV245ATDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 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-SOIC
SN74LV245ATDWR FAQ
1.How can I place an order for SN74LV245ATDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245ATDWR 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 SN74LV245ATDWR reliable?
The price and inventory of SN74LV245ATDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245ATDWR is usually 5 days.
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SN74LV245ATDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245ATDWR 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 SN74LV245ATDWR?
For technical support, including SN74LV245ATDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245ATDWR requirements.
6.How does Aetrix verify that SN74LV245ATDWR is sourced from the original manufacturer or authorized distributors?
All SN74LV245ATDWR 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 SN74LV245ATDWR meets industry standards.
7.What is the process for return or replacement of SN74LV245ATDWR?
All SN74LV245ATDWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245ATDWR, 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 SN74LV245ATDWR part is unused and in its original packaging.
Return procedure for SN74LV245ATDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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