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Texas Instruments SN74LVT245BDWR
- Part No.:
- SN74LVT245BDWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVT245BDWR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,937
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Product details
Overview
SN74LVT245BDWR from Texas Instruments is a 3.3-V ABT octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 3.3-V and 5-V systems. It supports mixed-mode signal operation, hot insertion via Ioff and power-up 3-state, and operates down to 2.7 V. Key parameters include VCC = 2.7–3.6 V, tPLH/tPHL ≤ 3.5 ns at 3.3 V, and IOL = 64 mA.
For engineers reviewing the SN74LVT245BDWR datasheet, SN74LVT245BDWR pinout, SN74LVT245BDWR application, or SN74LVT245BDWR equivalent, this device is selected for level-shifting in memory interfaces, FPGA-to-ASIC interconnects, and industrial backplane buses where TTL-compatible 3.3-V logic isolation and low ground bounce (<0.8 V) are critical.
Technical Context
The SN74LVT245BDWR implements an advanced BiCMOS ABT (Advanced Bus Transceiver) architecture enabling true 5-V-tolerant inputs while operating from a 3.3-V supply. Its DIR-controlled bidirectional data path allows A→B or B→A transmission, and OE enables full 3-state isolation of both buses.
Hot-insertion support is achieved through dual protection mechanisms: Ioff limits current backflow when VCC = 0 V, and power-up 3-state ensures outputs remain high-impedance during power ramping (Δt/ΔVCC ≤ 200 μs/V). Latch-up immunity exceeds 100 mA per JESD 78 Class II.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - Enables stable operation under unregulated battery supply or noisy rail conditions. |
| IOH / IOL | −32 mA / +64 mA - Supports driving standard TTL loads and fan-out to multiple CMOS inputs. |
| tPLH / tPHL | ≤3.5 ns at VCC = 3.3 V - Ensures sub-4 ns propagation delay for high-speed bus arbitration and timing-critical transfers. |
| VOLP (Ground Bounce) | <0.8 V at VCC = 3.3 V - Minimizes noise coupling into shared ground planes in dense PCB layouts. |
| VI (Input Voltage) | Up to 5.5 V - Allows direct connection to 5-V logic without external level shifters or clamping diodes. |
| Ioff | ±100 μA at VCC = 0 - Prevents damaging back-current during live board insertion or partial power-down. |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - Meets industrial-grade ESD robustness requirements without added protection circuitry. |
Pinout & Package
SN74LVT245BDWR is housed in a 20-pin SOIC (DW) package measuring 7.5 mm × 12.8 mm × 2.65 mm (max height), with 1.27-mm lead pitch and JEDEC MS-013 compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | Determines data flow direction: DIR = L → B-to-A; DIR = H → A-to-B. |
| 2–9 (A1–A8) | Port A data inputs/outputs | 8-bit bidirectional bus interface on side A; 5-V tolerant with 3.3-V VCC. |
| 10 (GND) | Ground reference | Primary return path for all internal logic and output drivers; must be low-impedance. |
| 11 (VCC) | Supply voltage | 3.3-V nominal supply; supports operation down to 2.7 V with full parameter guarantee. |
| 12 (OE) | Output enable input | Active-low control: OE = L enables transceiver; OE = H forces all A/B pins to high-impedance. |
| 13–20 (B1–B8) | Port B data inputs/outputs | 8-bit bidirectional bus interface on side B; electrically identical to A port. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5-V input tolerance with 3.3-V VCC eliminates need for external level translators in hybrid-voltage systems. |
| Hot-insertion support | Ioff and power-up 3-state prevent bus contention and backfeed damage during live card replacement. |
| Low ground bounce (VOLP) | <0.8 V at 3.3 V ensures signal integrity in multi-driver environments with shared ground planes. |
| Latch-up immunity | Exceeds 100 mA per JESD 78 Class II - guarantees robust operation in high-noise industrial settings. |
| ESD protection | 2000-V HBM rating reduces risk of field failure without supplemental TVS components. |
Applications
| Memory Interface Expansion | FPGA-to-Microcontroller Interconnect |
|---|---|
Use Scenario: Expanding external SRAM or Flash memory address/data bus between a 3.3-V microcontroller and legacy 5-V memory devices. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver enabling synchronous read/write cycles across voltage domains. Use Value: Eliminates discrete resistor-divider or active translator circuits, reducing BOM count and layout area while maintaining <4 ns propagation delay. | Use Scenario: Connecting a 3.3-V FPGA I/O bank to a 5-V industrial microcontroller UART or parallel control bus. IC Role / Device Role / Timing Role: Isolating and translating control signals (e.g., chip select, interrupt, data strobes) with precise timing alignment. Use Value: Guarantees VI up to 5.5 V and VOLP <0.8 V, preventing false triggering and ground noise corruption in real-time control loops. |
| Industrial Backplane Data Routing | Test Equipment Signal Conditioning |
Use Scenario: Routing sensor data or configuration commands across modular PLC backplanes with mixed 3.3-V and 5-V modules. IC Role / Device Role / Timing Role: Hot-pluggable bus isolator ensuring safe module insertion/removal without disrupting active communication. Use Value: Ioff ≤ ±100 μA and power-up 3-state prevent bus lockup or latch-up during field maintenance. | Use Scenario: Conditioning digital stimulus/response signals in automated test equipment interfacing legacy 5-V DUTs with modern 3.3-V controller boards. IC Role / Device Role / Timing Role: Precision timing buffer with matched tPLH/tPHL (≤3.5 ns) and low skew for synchronized pattern generation. Use Value: Sub-4 ns delay variation and 64 mA drive strength ensure accurate edge placement and load driving across multiple DUT channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVTH245A | Lower drive strength (IOL = 32 mA), no Ioff, 2.7–3.6 V only, no 5-V input tolerance. | Suitable for pure 3.3-V systems without hot-swap or mixed-voltage requirements. | Select when cost sensitivity outweighs mixed-mode capability and hot-insertion is not required. |
| 74ALVC16245 | 16-bit version, same VCC range, but lacks Ioff and has lower ESD rating (1500-V HBM). | Used in wider data paths (e.g., 16-bit memory buses); requires external hot-swap protection. | Choose for higher bandwidth needs where pin count and board space allow 16-bit width and external protection is acceptable. |
Compared with SN74LVTH245A and 74ALVC16245, the SN74LVT245BDWR uniquely combines 5-V input tolerance, Ioff-enabled hot insertion, and 64 mA drive in a compact 20-pin SOIC - making it the only option among the three qualified for mixed-voltage backplane and live-replaceable module designs.
Availability
SN74LVT245BDWR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded computing applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for SN74LVT245BDWR 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 logic solutions with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVT245BDWR belongs to TI's ABT logic family, engineered for high-speed, mixed-voltage bus interfacing in mission-critical systems where reliability, timing precision, and voltage domain bridging are essential.
FAQ
What is the maximum operating temperature range for the SN74LVT245BDWR?
The SN74LVT245BDWR is specified for operation from −40°C to +85°C ambient temperature. This industrial-grade range ensures reliable performance in factory automation controllers, outdoor test instrumentation, and embedded systems deployed in thermally demanding environments without derating.
Does the SN74LVT245BDWR require external pull-up resistors on OE or DIR?
OE should be tied to VCC through a pull-up resistor (minimum value determined by driver sink capability) to ensure high-impedance state during power-up or power-down. DIR has no such requirement and may be driven directly from logic outputs or pulled to VCC/GND as needed for fixed-direction operation.
Can the SN74LVT245BDWR interface directly with 5-V CMOS logic?
Yes - the SN74LVT245BDWR accepts input voltages up to 5.5 V on all A and B port pins while operating from a 3.3-V VCC. This 5-V-tolerant input capability allows direct connection to standard 5-V CMOS outputs without level-shifting components.
What is the thermal resistance (θJA) of the SN74LVT245BDWR in its SOIC (DW) package?
The SN74LVT245BDWR in the SOIC (DW) package has a junction-to-ambient thermal resistance (θJA) of 58°C/W, measured per JESD 51-7. This value assumes standard JEDEC 2-layer board conditions and enables thermal design margin estimation for continuous operation at full drive strength.
Is the SN74LVT245BDWR pin-compatible with other members of the SN74LVT245B family?
Yes - all SN74LVT245B variants (including DBR, NSR, PWR, RGYR) share identical 20-pin functional pinouts and logic behavior. The SN74LVT245BDWR is fully interchangeable at the board level with other package variants, differing only in mechanical form factor and thermal characteristics.
SN74LVT245BDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVT
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74LVT245BDWR FAQ
1.How can I place an order for SN74LVT245BDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVT245BDWR 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 SN74LVT245BDWR reliable?
The price and inventory of SN74LVT245BDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT245BDWR is usually 5 days.
3.What payment methods are accepted for SN74LVT245BDWR?
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4.How is shipping managed for SN74LVT245BDWR?
SN74LVT245BDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVT245BDWR 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 SN74LVT245BDWR?
For technical support, including SN74LVT245BDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT245BDWR requirements.
6.How does Aetrix verify that SN74LVT245BDWR is sourced from the original manufacturer or authorized distributors?
All SN74LVT245BDWR 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 SN74LVT245BDWR meets industry standards.
7.What is the process for return or replacement of SN74LVT245BDWR?
All SN74LVT245BDWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT245BDWR, 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 SN74LVT245BDWR part is unused and in its original packaging.
Return procedure for SN74LVT245BDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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