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Texas Instruments SN74LVT245BDW
- Part No.:
- SN74LVT245BDW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVT245BDW.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:605
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Product details
Overview
SN74LVT245BDW 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 from 2.7 V to 3.6 V. Key parameters include tPLH/tPHL ≤ 3.5 ns (VCC = 3.3 V), IOL = 64 mA, and VOL ≤ 0.55 V at full drive.
For engineers reviewing the SN74LVT245BDW datasheet, SN74LVT245BDW pinout, SN74LVT245BDW application, or SN74LVT245BDW equivalent, this device is selected for level-shifting in memory interfaces, backplane data buses, and hot-pluggable peripheral interconnects where TTL-compatible 3.3-V logic and robust isolation during power sequencing are required.
Technical Context
The SN74LVT245BDW implements an advanced BiCMOS ABT (Advanced Bus Transceiver) architecture enabling high-speed bidirectional data flow between A and B buses under DIR control, with OE enabling/disabling all outputs simultaneously. Its Ioff circuitry actively disables outputs when VCC = 0 V, preventing backflow current during hot insertion.
It features TTL-level input thresholds (VIH = 2 V, VIL = 0.8 V) while operating from a 3.3-V supply, allowing direct interfacing with legacy 5-V logic without external level shifters. Output ground bounce (VOLP) is specified < 0.8 V at VCC = 3.3 V, TA = 25°C, supporting noise-tolerant system design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - Enables stable operation across unregulated battery supplies and low-noise 3.3-V rails. |
| Propagation Delay | tPLH/tPHL ≤ 3.5 ns at VCC = 3.3 V - Supports >200 Mbps data rates in point-to-point or stub-bus topologies. |
| Output Drive | IOL = 64 mA, IOH = −32 mA - Sustains full-strength signaling into 50-Ω transmission lines or multiple TTL loads. |
| Input Voltage Range | VI up to 5.5 V - Accepts 5-V TTL inputs directly without clamping diodes or external resistors. |
| Hot-Insertion Support | Ioff ≤ ±100 μA at VCC = 0 - Prevents damaging current flow when board is inserted into live backplane. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - Meets industrial-grade robustness requirements per JESD22. |
| Thermal Resistance | θJA = 58°C/W (DW package) - Enables reliable operation at 85°C ambient with minimal heatsinking. |
Pinout & Package
SN74LVT245BDW is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.27 mm lead pitch, 2.65 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| 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; enables bidirectional bus arbitration. |
| 2–9 (A1–A8) | Port A Data Inputs/Outputs | 8-bit parallel interface for one side of the bus; driven by or drives external logic depending on DIR/OE state. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output currents; must be low-impedance for noise control. |
| 11 (VCC) | Supply Voltage | 3.3-V core supply; supports down to 2.7 V for brownout tolerance in battery-powered systems. |
| 12 (OE) | Output Enable Input | Active-low control: OE = L enables transceiver; OE = H places all A/B outputs in high-impedance state for bus isolation. |
| 13–20 (B1–B8) | Port B Data Inputs/Outputs | 8-bit parallel interface for second bus segment; electrically identical to A port but physically isolated. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode 5-V/3.3-V interface | Accepts 5-V TTL inputs while powered from 3.3 V - eliminates external level shifters in hybrid voltage systems. |
| Power-up 3-state | Outputs remain high-Z during power ramp (Δt/ΔVCC ≤ 200 μs/V) - prevents bus contention at power-on/off. |
| Latch-up immunity | Exceeds 100 mA per JESD78 Class II - ensures survivability in noisy industrial environments with transient coupling. |
| Low output ground bounce | VOLP < 0.8 V at VCC = 3.3 V - maintains signal integrity and timing margins in high-speed parallel buses. |
| Hot-insertion support | Ioff ≤ ±100 μA at VCC = 0 - enables safe field replacement of modules in live backplanes without system shutdown. |
Applications
| Memory Subsystem Interface | Industrial Backplane Interconnect |
|---|---|
Use Scenario: Connecting a 3.3-V FPGA memory controller to a 5-V SRAM or Flash memory array. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing address/data strobes with sub-4 ns propagation delay. Use Value: Eliminates discrete resistor-based level shifters and reduces PCB area while maintaining setup/hold timing compliance. | Use Scenario: Isolating hot-swappable I/O modules from a central 5-V backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Bus isolator with Ioff and power-up 3-state ensuring no current injection during module insertion/removal. Use Value: Prevents backplane voltage sag and protects upstream drivers during live module changes. |
| Test Equipment Data Bus | Communications Baseband Processing |
Use Scenario: Interfacing a 3.3-V ADC/DAC evaluation board to a 5-V test instrument's GPIB or parallel bus. IC Role / Device Role / Timing Role: Direction-controlled data bridge synchronizing sample transfers with external trigger signals. Use Value: Provides deterministic latency (<3.5 ns) and rail-to-rail logic compatibility for calibrated measurement accuracy. | Use Scenario: Linking a 3.3-V baseband processor to legacy 5-V RF front-end ICs in cellular infrastructure equipment. IC Role / Device Role / Timing Role: Asynchronous bus transceiver handling control/status registers and burst data payloads. Use Value: Maintains signal integrity across mixed-voltage domains while meeting ESD requirements for field-deployed hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVTH245ADW | Lower drive strength (IOL = 24 mA), higher tPLH/tPHL (≤5.5 ns), LVTH family with different input threshold behavior. | Suitable for lower-speed, lower-power applications; not rated for 5-V input tolerance beyond VI = 5.5 V absolute max. | Select SN74LVTH245ADW only if system load capacitance and speed requirements allow relaxed timing and reduced drive. |
| 74ALVC16245DGG | 16-bit dual-octave, 3.3-V only (no 5-V input tolerance), different pinout, higher ICC in active state. | Used in wider data paths requiring 16-bit width; lacks mixed-voltage capability and hot-insertion Ioff support. | Choose 74ALVC16245DGG only when 16-bit width is mandatory and 5-V interface is absent; verify thermal derating for DW footprint. |
Compared with SN74LVTH245ADW and 74ALVC16245DGG, the SN74LVT245BDW uniquely combines 5-V-tolerant inputs, 64-mA drive, sub-4-ns delay, and certified hot-insertion capability in a standard 20-pin SOIC - making it the preferred choice for robust, mixed-voltage, high-speed bus bridging.
Availability
SN74LVT245BDW is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and communications infrastructure requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SN74LVT245BDW 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 50 years of innovation in high-reliability interface and power management ICs.
The SN74LVT245BDW belongs to TI's ABT logic family, engineered specifically for high-speed, mixed-voltage bus interfacing in industrial, telecom, and computing systems where signal integrity and hot-swap resilience are critical.
FAQ
What is the maximum data rate supported by the SN74LVT245BDW?
The SN74LVT245BDW supports effective data rates exceeding 200 Mbps in point-to-point configurations, based on its guaranteed tPLH/tPHL ≤ 3.5 ns (VCC = 3.3 V) and tPZH/tPHZ ≤ 7.1 ns. Real-world throughput depends on bus loading, termination, and PCB layout; for stub-bus topologies, derate to ~100 Mbps to maintain signal integrity.
Can the SN74LVT245BDW safely interface a 5-V microcontroller with a 3.3-V FPGA?
Yes - the SN74LVT245BDW accepts 5-V TTL inputs (VI up to 5.5 V) while operating from a 3.3-V VCC, making it ideal for bidirectional interfacing between 5-V microcontrollers and 3.3-V FPGAs. Its 5-V-tolerant inputs eliminate external clamping or voltage dividers, and its 3-state outputs prevent contention during reset sequences.
How does the SN74LVT245BDW handle power sequencing during hot insertion?
The SN74LVT245BDW uses integrated Ioff and power-up 3-state circuitry to ensure safe hot insertion: Ioff limits current to ±100 μA when VCC = 0 V, preventing backflow into powered systems; power-up 3-state holds outputs high-Z until VCC reaches valid logic levels, avoiding bus conflicts during ramp-up.
What is the recommended pull-up resistor value for OE on the SN74LVT245BDW?
Texas Instruments recommends tying OE to VCC through a pull-up resistor to ensure high-impedance state during power-up. The minimum value is determined by the driver's current-sinking capability; for typical 3.3-V systems, a 4.7-kΩ resistor provides sufficient margin while limiting standby current to <1 mA, per SCES004H guidelines.
Is the SN74LVT245BDW pin-compatible with other packages in the SN74LVT245B family?
Yes - the SN74LVT245BDW (SOIC-DW) shares identical pinout and electrical functionality with SN74LVT245BDBR (SSOP-DB), SN74LVT245BPWR (TSSOP-PW), and SN74LVT245BRGYR (VQFN-RGY). All variants use the same 20-pin functional mapping, enabling drop-in replacement across packages when thermal and board space constraints permit.
SN74LVT245BDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
SN74LVT245BDW FAQ
1.How can I place an order for SN74LVT245BDW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVT245BDW 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 SN74LVT245BDW reliable?
The price and inventory of SN74LVT245BDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT245BDW is usually 5 days.
3.What payment methods are accepted for SN74LVT245BDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVT245BDW transactions.
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4.How is shipping managed for SN74LVT245BDW?
SN74LVT245BDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVT245BDW 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 SN74LVT245BDW?
For technical support, including SN74LVT245BDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT245BDW requirements.
6.How does Aetrix verify that SN74LVT245BDW is sourced from the original manufacturer or authorized distributors?
All SN74LVT245BDW 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 SN74LVT245BDW meets industry standards.
7.What is the process for return or replacement of SN74LVT245BDW?
All SN74LVT245BDW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT245BDW, 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 SN74LVT245BDW part is unused and in its original packaging.
Return procedure for SN74LVT245BDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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