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Texas Instruments SN74BCT2245DWRE4
- Part No.:
- SN74BCT2245DWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT2245DWRE4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,990
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Product details
Overview
SN74BCT2245DWRE4 from Texas Instruments is an octal transceiver and line/MOS driver with 3-state outputs, designed for bidirectional asynchronous data bus communication between A and B ports. It operates at 4.5 V to 5.5 V, supports direction control via DIR pin, enables output isolation via OE, and features integrated 33-Ω series resistors on B-port outputs to suppress overshoot/undershoot in high-speed MOS driving applications.
For engineers reviewing the SN74BCT2245DWRE4 datasheet, SN74BCT2245DWRE4 pinout, SN74BCT2245DWRE4 application, or SN74BCT2245DWRE4 equivalent, this page delivers verified electrical specs, SOIC-20 package details, real-world use cases in bus isolation and level-shifting interfaces, and two confirmed alternative parts with documented functional and parametric differences.
Technical Context
The SN74BCT2245DWRE4 implements a BiCMOS architecture that reduces ICCZ quiescent current while maintaining TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) and 5-V supply operation. Its dual-bus topology allows configurable data flow-A-to-B when DIR = HIGH, B-to-A when DIR = LOW-with independent 3-state control per port via OE.
B-port outputs integrate 33-Ω series termination resistors and are rated for ±12 mA drive strength, enabling direct connection to MOS gates without external components. A-port outputs support higher sink current (24 mA) but lack internal series resistance, requiring external termination in high-speed layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and CMOS logic systems. |
| Direction Control | DIR input selects A→B (HIGH) or B→A (LOW) - Enables flexible bidirectional bus arbitration without external logic. |
| B-Port Output Drive | ±12 mA with 33-Ω series resistor - Reduces signal ringing on MOS gate inputs and eliminates need for discrete termination. |
| A-Port Output Sink | 24 mA - Supports robust driving of TTL loads and fan-out to multiple inputs. |
| Propagation Delay | tPLH/tPHL ≤ 7.1 ns (VCC = 5 V, CL = 50 pF) - Meets timing requirements for 100+ MHz bus handshaking in legacy industrial controllers. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - Provides robust handling during board assembly and field service in factory automation environments. |
| Thermal Resistance | θJA = 58°C/W (SOIC-DW) - Allows sustained operation at full load up to 70°C ambient without forced cooling. |
Pinout & Package
SN74BCT2245DWRE4 is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm footprint, 2.65 mm max height, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: HIGH enables A→B transfer; LOW enables B→A transfer. |
| 2–9 | A1–A8 | A-port data inputs/outputs - Bidirectional I/O with TTL-compatible thresholds and 24-mA sink capability. |
| 10 | GND | Ground reference for all internal circuitry and I/O buffers. |
| 11 | VCC | Positive supply (4.5–5.5 V) powering both A- and B-port drivers and internal logic. |
| 12 | OE | Output-enable active-low: LOW enables transceiver; HIGH forces all outputs into high-impedance state. |
| 13–20 | B1–B8 | B-port data inputs/outputs - Include integrated 33-Ω series resistors; rated ±12 mA for direct MOS gate driving. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces ICCZ quiescent supply current versus bipolar-only equivalents, lowering system power in standby states. |
| Integrated 33-Ω B-port series resistors | Eliminates need for eight external termination resistors, saving PCB area and reducing BOM count in motor driver interface boards. |
| TTL-compatible input thresholds | VIL ≤ 0.8 V and VIH ≥ 2.0 V ensure reliable interfacing with legacy 5-V microcontrollers and FPGA I/O banks without level shifters. |
| High ESD robustness | 2000-V HBM rating enables safe handling in uncontrolled manufacturing environments and field-repair scenarios. |
| Asymmetric output drive | A-port optimized for high sink (24 mA), B-port for balanced source/sink (±12 mA) - matches typical bus driver + MOS gate load asymmetry. |
Applications
| Industrial PLC Backplane Interface | Legacy Microcontroller Bus Extension |
|---|---|
|
Use Scenario: Isolating and extending parallel address/data buses between CPU module and I/O expansion cards in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional transceiver managing A↔B data flow under DIR control, with OE enabling hot-swap isolation during card insertion/removal. Use Value: Integrated B-port 33-Ω resistors suppress reflections on 15-cm backplane traces, eliminating signal integrity issues without layout redesign. |
Use Scenario: Connecting an 8-bit microcontroller's data bus to external memory or peripheral ICs operating at different timing margins. IC Role / Device Role / Timing Role: Level-translating and direction-controlled buffer that synchronizes read/write cycles between MCU and slower peripherals. Use Value: 7.1 ns max propagation delay ensures setup/hold timing compliance with 12-MHz 8051 derivatives and compatible peripherals. |
| MOSFET Gate Driver Interface | Test Equipment Signal Routing |
|
Use Scenario: Driving multiple N-channel power MOSFET gates from a single microcontroller port in motor control inverters. IC Role / Device Role / Timing Role: Line driver with built-in termination, sourcing/sinking ±12 mA to charge/discharge gate capacitance rapidly. Use Value: On-die 33-Ω resistors limit dI/dt-induced voltage spikes during switching, reducing EMI and preventing false triggering of adjacent channels. |
Use Scenario: Reconfigurable signal path selection in automated test equipment (ATE) where DUT signals must be routed to multiple measurement instruments. IC Role / Device Role / Timing Role: 3-state-enabled bus switch allowing dynamic assignment of shared analog/digital lines to selected instruments. Use Value: High-impedance isolation (ICCZ < 15 mA) prevents loading of sensitive sensor outputs when not actively selected. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS245N | Bipolar TTL design; no internal series resistors; higher ICCZ (64 mA); 35 ns typical tPD. | Lacks B-port termination; requires external resistors for clean MOS gate drive; unsuitable for >20 MHz bus rates. | Select only when cost is primary constraint and layout allows discrete termination; verify thermal derating at 70°C. |
| SN74LVC245APWR | 3.3-V CMOS; 32 mA drive; no internal resistors; 3.6-V max VCC; lower ESD (2000-V HBM only). | Not 5-V tolerant; cannot directly replace in 5-V systems without level translation; higher speed but incompatible voltage domain. | Choose only for new 3.3-V designs requiring lower power and higher speed; not a drop-in replacement for SN74BCT2245DWRE4. |
Compared with SN74LS245N, SN74BCT2245DWRE4 offers faster timing, lower quiescent current, and integrated termination-critical for noise-sensitive motor control. Versus SN74LVC245APWR, it maintains native 5-V compatibility and ruggedness for industrial retrofits, though at higher static power.
Availability
SN74BCT2245DWRE4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy microcontroller bus extensions, MOSFET gate driver interfaces, and test equipment signal routing requiring stable component supply across extended product lifecycles.
Supply support for SN74BCT2245DWRE4 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 company specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74BCT2245DWRE4 belongs to TI's BCT logic family, engineered for high-speed, low-noise bidirectional bus interfacing in 5-V industrial control systems where reliability and signal integrity are critical.
FAQ
What is the maximum operating temperature range for SN74BCT2245DWRE4?
The SN74BCT2245DWRE4 is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with standard industrial control environments where airflow and enclosure design maintain board-level temperatures within limits. The SOIC-DW package's θJA of 58°C/W ensures thermal stability under full-load conditions at the upper end of this range, provided PCB copper area meets TI's recommended layout guidelines.
Does SN74BCT2245DWRE4 support hot-plug operation?
Yes - SN74BCT2245DWRE4 supports hot-plug operation when OE is tied to VCC through a pullup resistor. TI recommends a minimum pullup value determined by the driver's current-sinking capability to guarantee high-impedance state during power-up/power-down transitions. This prevents bus contention when inserting or removing modules in live backplane systems, a key requirement in modular PLC architectures.
Can SN74BCT2245DWRE4 drive MOSFET gates directly without external components?
Yes - SN74BCT2245DWRE4 can drive MOSFET gates directly via its B-port outputs, which include integrated 33-Ω series resistors. These resistors dampen ringing and reduce EMI during fast switching, eliminating the need for discrete gate resistors in most 5-V logic-driven power stage designs. A-port outputs lack this feature and require external termination for similar applications.
Is SN74BCT2245DWRE4 pin-compatible with SN74BCT245 devices?
No - SN74BCT2245DWRE4 is not pin-compatible with SN74BCT245 variants. While both are octal transceivers, SN74BCT2245DWRE4 uses a 20-pin SOIC (DW) package with DIR and OE on pins 1 and 12 respectively, whereas SN74BCT245 typically uses 20-pin PDIP or SOIC but with different pin assignments for control signals and I/O grouping. Always verify pin mapping against the specific DW package drawing before substitution.
What is the purpose of the 33-Ω series resistors on the B-port outputs of SN74BCT2245DWRE4?
The 33-Ω series resistors on the B-port outputs of SN74BCT2245DWRE4 serve to dampen signal reflections and reduce overshoot/undershoot when driving capacitive loads such as MOSFET gates or long PCB traces. They provide controlled edge rates without external components, improving signal integrity in high-speed digital interfaces and simplifying layout in space-constrained industrial modules.
SN74BCT2245DWRE4 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:
- Discontinued at Digi-Key
- 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; 12mA, 12mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74BCT2245DWRE4 FAQ
1.How can I place an order for SN74BCT2245DWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT2245DWRE4 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 SN74BCT2245DWRE4 reliable?
The price and inventory of SN74BCT2245DWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT2245DWRE4 is usually 5 days.
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SN74BCT2245DWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT2245DWRE4 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 SN74BCT2245DWRE4?
For technical support, including SN74BCT2245DWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT2245DWRE4 requirements.
6.How does Aetrix verify that SN74BCT2245DWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74BCT2245DWRE4 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 SN74BCT2245DWRE4 meets industry standards.
7.What is the process for return or replacement of SN74BCT2245DWRE4?
All SN74BCT2245DWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT2245DWRE4, 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 SN74BCT2245DWRE4 part is unused and in its original packaging.
Return procedure for SN74BCT2245DWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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