My Inquiry
My Account
Texas Instruments SN74BCT2245DWR
- Part No.:
- SN74BCT2245DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT2245DWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:16,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74BCT2245DWR from Texas Instruments is an octal transceiver and line/MOS driver with 3-state outputs, designed for asynchronous bidirectional data bus communication between A and B buses. It operates at 4.5 V to 5.5 V, supports direction control via DIR input and output enable via OE input, and features integrated 33-Ω series resistors on all B-port outputs to suppress overshoot/undershoot in high-speed MOS driving applications.
For engineers reviewing the SN74BCT2245DWR datasheet, SN74BCT2245DWR pinout, SN74BCT2245DWR application, or SN74BCT2245DWR equivalent, key selection considerations include its BiCMOS architecture, 12 mA B-port sink/source capability, 3-state isolation timing (tPZH/tPLZ ≤ 11.4 ns), ESD protection exceeding JESD22-A114-A (2000-V HBM), and SOIC-20 tape-and-reel packaging for automated assembly.
Technical Context
The SN74BCT2245DWR implements a dual-bus transceiver architecture with independent direction (DIR) and output-enable (OE) controls, enabling configurable unidirectional data flow (A→B or B→A) or full 3-state isolation. Its BiCMOS design combines bipolar switching speed with CMOS low static power, achieving ICCZ as low as 8 mA typical under disabled conditions.
B-port outputs integrate 33-Ω series termination resistors-eliminating external components-and are rated for ±12 mA drive strength, while A-port outputs support ±24 mA sink/source. Propagation delays range from 1.7 ns (tPLH B→A) to 7.8 ns (tPHL A→B) at 5 V, CL = 50 pF, meeting TTL-compatible timing requirements for legacy bus interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with 5-V TTL and mixed-voltage systems without level-shifting. |
| B-Port Output Drive | ±12 mA - Sufficient to directly drive MOS gates or terminated transmission lines without external buffers. |
| A-Port Output Drive | 24 mA sink / −3 mA source - Optimized for TTL load driving and legacy bus termination. |
| Integrated Termination | 33-Ω series resistors on all B-port outputs - Reduces signal reflections and ringing on PCB traces up to ~50 MHz. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - Meets industrial-grade robustness requirements without added protection circuitry. |
| Propagation Delay | 1.7 ns to 7.8 ns - Supports synchronous bus rates up to ~100 MHz with margin for setup/hold timing. |
| ICCZ (Quiescent Current) | 8–14 mA - Significantly lower than standard TTL transceivers, reducing system standby power in isolated states. |
Pinout & Package
SN74BCT2245DWR is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm footprint, 2.65 mm max height, RoHS-compliant, MSL Level-1, tape-and-reel packaged (2000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: Low = B→A data transfer; High = A→B data transfer. |
| 2–9 | A1–A8 | A-side bidirectional data I/O pins - TTL-compatible inputs, 24-mA sink capable outputs. |
| 10 | GND | Ground reference for all internal circuitry and I/O interfaces. |
| 11 | VCC | Positive supply (4.5–5.5 V) powering both logic core and output drivers. |
| 12 | OE | Output-enable active-low input: Low = transceiver enabled; High = all outputs in high-impedance state. |
| 13–20 | B1–B8 | B-side bidirectional data I/O pins - Include integrated 33-Ω series resistors; ±12 mA drive. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Combines TTL speed with CMOS low ICCZ - reduces power by >40% vs. standard TTL transceivers during 3-state hold. |
| On-die 33-Ω B-port series termination | Eliminates need for 16 external resistors - saves PCB area, reduces BOM count, and ensures matched impedance per channel. |
| Asymmetric drive strength | A port optimized for TTL fanout (24 mA sink); B port balanced for MOS gate driving (±12 mA) - enables mixed-load interfacing. |
| Robust 3-state control timing | tPZH/tPLZ ≤ 11.4 ns ensures clean bus release without glitches during direction or enable transitions. |
| JESD22-compliant ESD protection | 2000-V HBM rating allows direct handling in non-ESD-controlled environments - reduces manufacturing yield loss. |
Applications
| Industrial PLC Backplane Interface | Legacy ISA Bus Signal Conditioning |
|---|---|
|
Use Scenario: Isolating and translating signals between microcontroller-based CPU modules and field I/O expansion cards in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional transceiver managing address/data strobes across 5-V backplane traces with variable loading. Use Value: Integrated 33-Ω B-port resistors suppress edge ringing on long parallel traces, maintaining signal integrity at 8-MHz bus clock rates. |
Use Scenario: Interfacing modern FPGA-based ISA bridge controllers with vintage ISA peripheral cards requiring strict TTL timing compliance. IC Role / Device Role / Timing Role: Direction-controlled data path between ISA data bus (B-side) and FPGA local bus (A-side), synchronized to ISA IOR/IOW strobes. Use Value: Sub-8 ns propagation delay and 24-mA A-port sink ensure setup/hold timing margins meet ISA specification even with 15-cm trace lengths. |
| MOSFET Gate Driver for Power Sequencing | Microcontroller GPIO Expansion Hub |
|
Use Scenario: Driving multiple N-channel MOSFETs in a multi-rail power supply sequencer where precise turn-on timing and shoot-through prevention are critical. IC Role / Device Role / Timing Role: Level-translating and current-boosting interface between 3.3-V MCU GPIO and 5-V gate drive rails. Use Value: ±12 mA B-port drive with built-in 33-Ω resistors provides controlled slew rate (~3 V/ns) - prevents cross-conduction in half-bridge stages. |
Use Scenario: Expanding digital I/O count of resource-constrained microcontrollers in embedded test equipment requiring simultaneous control of 16 relays and sensors. IC Role / Device Role / Timing Role: Parallel I/O expander with direction-selectable ports, managed via MCU GPIOs for DIR and OE. Use Value: Low ICCZ (8 mA typ.) and fast disable timing (tPLZ ≤ 7.6 ns) allow rapid reconfiguration between input sampling and output driving phases. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS245N | Standard TTL process; no integrated termination; 26-mA A-port sink but only ±15 mA B-port drive; higher ICCZ (40 mA typ.) | Lacks B-port series resistors - requires external 33-Ω resistors for clean MOS driving; slower propagation (15–25 ns) | Choose when cost sensitivity outweighs layout simplicity and ESD robustness; verify board-level termination. |
| SN74LVC245APW | 3.3-V CMOS logic; 32-mA drive; no integrated resistors; supports 1.65–3.6 V operation; lower ESD (1500-V HBM) | Not 5-V tolerant - requires level shifters for 5-V bus interfacing; unsuitable for direct MOS gate driving without external R | Prefer for 3.3-V-only systems needing higher speed (tPD < 4 ns) and lower power; avoid in mixed 5-V legacy environments. |
Compared with SN74LS245N and SN74LVC245APW, the SN74BCT2245DWR uniquely delivers 5-V TTL compatibility, integrated B-port termination, and industrial-grade ESD in a single SOIC-20 package - eliminating design compromises between signal integrity, component count, and ruggedness in legacy bus upgrades.
Availability
SN74BCT2245DWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, ISA bus adapters, MOSFET gate drivers, microcontroller I/O expansion hubs, and legacy system refurbishment requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT2245DWR 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74BCT2245DWR belongs to TI's legacy BCT logic family, engineered specifically for robust, high-drive 5-V bus interfacing in industrial control and computing infrastructure where reliability, noise immunity, and backward compatibility are critical.
FAQ
What is the maximum operating temperature range for the SN74BCT2245DWR?
The SN74BCT2245DWR is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with standard industrial control and computing environments where airflow and board-level thermal management maintain junction temperatures within safe limits. The SOIC-20 package has a θJA of 58°C/W, allowing sustained operation at full drive strength within this range when PCB copper area meets TI's recommended layout guidelines.
Does the SN74BCT2245DWR require external pull-up resistors on the OE pin?
Yes - to ensure high-impedance state during power-up or power-down, OE must be tied to VCC through a pull-up resistor. The minimum value depends on the current-sinking capability of the driving source; TI recommends ≥10 kΩ for typical microcontroller GPIOs. This prevents bus contention before firmware initializes DIR and OE, a critical requirement confirmed in the device's functional description and power sequencing guidance.
Can the SN74BCT2245DWR interface directly with 3.3-V logic devices?
No - the SN74BCT2245DWR is a 5-V-only device with TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) and 5-V output swing. While its inputs may accept 3.3-V logic HIGH levels, its outputs swing to 0 V / ~3.4 V (at IOH = −12 mA), which falls below the VIH minimum of many 3.3-V receivers. Direct connection risks unreliable logic detection; a level shifter or voltage translator is required for interoperability.
What is the purpose of the 33-Ω series resistors on the B-port outputs of the SN74BCT2245DWR?
The 33-Ω series resistors on all eight B-port outputs of the SN74BCT2245DWR serve to dampen signal reflections on PCB traces, reducing overshoot and undershoot during fast edge transitions. They match typical FR-4 trace impedances (≈50–75 Ω) when combined with load capacitance, enabling clean 5-V signal transmission up to ~50 MHz without external termination components - a key differentiator versus standard transceivers like the SN74LS245.
Is the SN74BCT2245DWR pin-compatible with other packages in the SN74BCT2245 family?
Yes - the SN74BCT2245DWR shares identical pinout and functionality with SN74BCT2245DW (SOIC tube), SN74BCT2245NSR (SOP), and SN74BCT2245DBR (SSOP). All variants use the same 20-pin topology: DIR (pin 1), A1–A8 (pins 2–9), GND (10), VCC (11), OE (12), B1–B8 (pins 13–20). This allows drop-in replacement across package types without PCB redesign, provided mechanical constraints (height, footprint, reflow profile) are verified.
SN74BCT2245DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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; 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
SN74BCT2245DWR FAQ
1.How can I place an order for SN74BCT2245DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT2245DWR 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 SN74BCT2245DWR reliable?
The price and inventory of SN74BCT2245DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT2245DWR is usually 5 days.
3.What payment methods are accepted for SN74BCT2245DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT2245DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT2245DWR?
SN74BCT2245DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT2245DWR 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 SN74BCT2245DWR?
For technical support, including SN74BCT2245DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT2245DWR requirements.
6.How does Aetrix verify that SN74BCT2245DWR is sourced from the original manufacturer or authorized distributors?
All SN74BCT2245DWR 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 SN74BCT2245DWR meets industry standards.
7.What is the process for return or replacement of SN74BCT2245DWR?
All SN74BCT2245DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT2245DWR, 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 SN74BCT2245DWR part is unused and in its original packaging.
Return procedure for SN74BCT2245DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74BCT2245DWR Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
