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Texas Instruments SN74BCT245DWR
- Part No.:
- SN74BCT245DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT245DWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,832
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Product details
Overview
SN74BCT245DWR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in industrial control and memory interface applications. It features direction control (DIR), output enable (OE), 5-V supply operation, ±128 mA sink capability on B-port outputs, and ESD protection exceeding 2000-V HBM.
For engineers reviewing the SN74BCT245DWR datasheet, SN74BCT245DWR pinout, SN74BCT245DWR application, or SN74BCT245DWR equivalent, this page delivers verified electrical specs, SOIC-20 package details, real-world timing behavior (tPLH/tPHL ≤ 7 ns), thermal resistance (θJA = 58°C/W), and validated alternatives for bus isolation and level-shifting designs.
Technical Context
The SN74BCT245DWR implements TTL-compatible bipolar transistor-transistor logic (BCT) architecture, enabling high-speed bus driving with controlled edge rates and robust noise immunity. Its dual 8-bit bidirectional channels operate under independent DIR and OE control, supporting both A→B and B→A data flow without internal latching.
It functions as a non-latched, active-high OE-controlled 3-state buffer with asymmetric drive strength: B-port outputs deliver up to 64 mA low-level current (IOL), while A-port supports 24 mA - optimized for driving heavier bus loads from peripheral-side signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL/CMOS systems and stable operation across industrial voltage tolerances. |
| Propagation Delay | tPLH/tPHL ≤ 7 ns at VCC = 5 V, CL = 50 pF - enables reliable 100+ MHz bus handshaking in synchronous peripheral interfaces. |
| B-port IOL | 64 mA - drives terminated 50-Ω transmission lines or multiple TTL inputs without external buffering. |
| A-port IOL | 24 mA - sufficient for fanout to 10+ standard TTL loads, suitable for address/data register buffering. |
| 3-State Enable Time | tPZL/tPLZ ≤ 11.6 ns - guarantees rapid bus release during arbitration or multiplexer switching cycles. |
| ESD Rating | 2000-V HBM - meets JEDEC JESD22-A114A for handling robustness in manufacturing and field service environments. |
| Thermal Resistance | θJA = 58°C/W (SOIC-DW) - supports continuous operation at TA = 70°C with typical PCB copper area, no forced airflow required. |
Pinout & Package
SN74BCT245DWR uses a 20-pin SOIC (DW) package measuring 7.5 mm × 12.8 mm × 2.65 mm (max height), RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | Low = B→A data flow; High = A→B data flow - determines real-time bus traffic direction without clock or state retention. |
| 2–9 (A1–A8) | Port A I/O Terminals | Bi-directional TTL-compatible data lines with 24-mA sink capability - connect to microcontroller or FPGA local bus. |
| 10 (GND) | Ground Reference | Primary signal return path; must be low-inductance connection to minimize ground bounce during simultaneous switching. |
| 11 (VCC) | Power Supply | +5-V supply input; requires local 0.1-µF ceramic decoupling within 5 mm of pin to suppress switching noise. |
| 12 (OE) | Output Enable Input | Active-low control: Low = transceiver enabled; High = all outputs in high-impedance state - enables bus sharing among multiple devices. |
| 13–20 (B1–B8) | Port B I/O Terminals | Bi-directional TTL-compatible data lines with 64-mA sink capability - drive memory address registers or backplane buses directly. |
Key Features
| Feature | Design Value |
|---|---|
| Asymmetric Output Drive | B-port delivers 64 mA sink vs. A-port's 24 mA - matches legacy system load asymmetry where peripherals drive heavier bus capacitance. |
| 3-State Isolation | OE-controlled high-impedance mode with <1 µA leakage - prevents bus contention when multiple transceivers share common lines. |
| Wide Operating Range | 0°C to 70°C ambient with 4.5–5.5 V supply - certified for commercial industrial equipment without derating. |
| Robust Input Clamping | VIK = –1.2 V at –18 mA - protects against negative transients during hot-plug or cable discharge events. |
| Controlled Switching | Propagation delays tightly bounded (±0.5 ns typical variation) - simplifies timing margin analysis in deterministic real-time systems. |
Applications
| Industrial PLC Backplane Interface | Memory Address Register Buffer |
|---|---|
|
Use Scenario: Isolating CPU address/data bus from modular I/O expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver enabling CPU-initiated read/write cycles to remote I/O modules via shared backplane. Use Value: 64-mA B-port drive sustains signal integrity across 30-cm, 100-pF backplane traces; tPLH ≤ 7 ns ensures cycle times < 20 ns. |
Use Scenario: Buffering 8-bit address lines between microcontroller and parallel EEPROM or SRAM. IC Role / Device Role / Timing Role: Direction-controlled A→B driver translating MCU address outputs to memory chip inputs with precise setup/hold timing. Use Value: Asymmetric drive prevents address skew; OE synchronization eliminates glitches during memory access transitions. |
| Legacy System Bus Extender | Test Equipment Signal Routing |
|
Use Scenario: Extending TTL-level data bus between mainframe controller and add-on instrumentation cards. IC Role / Device Role / Timing Role: Repeater transceiver compensating for capacitive loading and voltage drop over long ribbon cables. Use Value: 2000-V HBM ESD rating withstands repeated card insertion; SOIC-DW package fits standard 0.3"-pitch card-edge connectors. |
Use Scenario: Configurable signal path routing in automated test equipment (ATE) channel matrices. IC Role / Device Role / Timing Role: Programmable bidirectional switch enabling dynamic reconfiguration of DUT signal paths under microcontroller control. Use Value: DIR/OE dual-control allows atomic path selection without race conditions; 3-state isolation prevents signal leakage between test channels. |
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 voltage (1.65–3.6 V), CMOS-based, 24 mA max IOL, 3.5 ns propagation delay | Targets modern low-voltage embedded systems; not 5-V tolerant without level shifters | Choose for battery-powered or mixed-voltage designs requiring lower power and faster speed; verify level compatibility with legacy 5-V buses. |
| SN74ABT245 | Bipolar ABT process, 64 mA B-port IOL, 4.5–5.5 V supply, 4.5 ns typical tPLH | Higher speed and identical pinout but improved AC characteristics and reduced ICCZ quiescent current | Prefer for new designs needing tighter timing margins or lower standby power; direct replacement in existing SOIC-DW layouts. |
Compared with SN74BCT245DWR, SN74LVC245A offers lower voltage operation and speed at the cost of 5-V bus compatibility, while SN74ABT245 provides superior timing performance and efficiency in identical 5-V systems - both retain SOIC-20 packaging and functional equivalence for bus isolation tasks.
Availability
SN74BCT245DWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, memory address buffering, legacy bus extension, and ATE signal routing requiring stable component supply and long-term lifecycle support.
Supply support for SN74BCT245DWR 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 decades of heritage in industrial-grade interface ICs.
The SN74BCT245DWR belongs to TI's legacy BCT logic family, engineered specifically for robust 5-V bus interfacing in harsh industrial and instrumentation environments where reliability and noise immunity are critical.
FAQ
What is the maximum operating temperature range for SN74BCT245DWR?
The SN74BCT245DWR is rated for 0°C to 70°C ambient operation per its commercial temperature grade. This range is validated across all electrical parameters in the datasheet, including propagation delay, output drive, and 3-state leakage. The SOIC-DW package's θJA = 58°C/W allows full-spec operation at 70°C with standard PCB layout - no derating required for typical industrial enclosures.
Does SN74BCT245DWR support hot-swap or live-insertion?
SN74BCT245DWR includes input clamping diodes (VIK = –1.2 V) and 2000-V HBM ESD protection, providing basic transient resilience during board insertion. However, it lacks explicit hot-swap circuitry such as slew-rate control or undervoltage lockout. For true hot-swap compliance, external current-limiting resistors and sequencing logic are recommended - the device itself does not guarantee glitch-free enablement during power ramp-up.
Can SN74BCT245DWR interface directly with 3.3-V logic?
No - SN74BCT245DWR is a 5-V-only device with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max). While its inputs may recognize 3.3-V logic highs, the outputs swing rail-to-rail at 5 V and can damage 3.3-V receivers. Direct interfacing requires level-shifting circuitry; TI recommends pairing with SN74LVCxxx translators or resistor-divider networks for safe bidirectional voltage translation.
What is the recommended decoupling for SN74BCT245DWR?
TI specifies a minimum 0.1-µF ceramic capacitor placed within 5 mm of the VCC (pin 11) and GND (pin 10) pins of SN74BCT245DWR. For systems with high-frequency switching (>10 MHz), adding a 4.7-µF tantalum or polymer capacitor nearby improves low-frequency stability. Ground plane integrity beneath the SOIC-DW footprint is critical - avoid splits under the device to minimize return-path inductance and suppress simultaneous switching noise.
Is SN74BCT245DWR pin-compatible with SN74ABT245?
Yes - SN74BCT245DWR and SN74ABT245 share identical SOIC-20 (DW) package dimensions, pin numbering, and functional pin assignments (DIR, OE, A1–A8, B1–B8, VCC, GND). Electrical differences exist in speed and quiescent current, but no PCB layout changes are needed for substitution. TI documents SN74ABT245 as a direct performance upgrade path for SN74BCT245DWR in new designs.
SN74BCT245DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- 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:
- 3mA, 24mA; 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74BCT245DWR FAQ
1.How can I place an order for SN74BCT245DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT245DWR 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 SN74BCT245DWR reliable?
The price and inventory of SN74BCT245DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT245DWR is usually 5 days.
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SN74BCT245DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT245DWR 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 SN74BCT245DWR?
For technical support, including SN74BCT245DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT245DWR requirements.
6.How does Aetrix verify that SN74BCT245DWR is sourced from the original manufacturer or authorized distributors?
All SN74BCT245DWR 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 SN74BCT245DWR meets industry standards.
7.What is the process for return or replacement of SN74BCT245DWR?
All SN74BCT245DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT245DWR, 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 SN74BCT245DWR part is unused and in its original packaging.
Return procedure for SN74BCT245DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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