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Texas Instruments SN64BCT245DW
- Part No.:
- SN64BCT245DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN64BCT245DW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,156
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Product details
Overview
SN64BCT245DW from Texas Instruments is an octal bus transceiver IC designed for asynchronous bidirectional data transfer between two 8-bit buses. It features true 3-state outputs, BiCMOS design (ICCZ ≤ 15 mA), ±64 mA B-side sink current, and operates across −40°C to 85°C in a 20-pin SOIC (DW) package - used in legacy industrial backplane and memory-mapped I/O interfacing.
For engineers reviewing the SN64BCT245DW datasheet, SN64BCT245DW pinout, SN64BCT245DW application, or SN64BCT245DW equivalent, key selection criteria include direction-control logic behavior, high-impedance state during power sequencing, 5-V supply tolerance, and SOIC-20 thermal and layout compatibility.
Technical Context
The SN64BCT245DW implements dual 8-bit bidirectional data paths controlled by DIR (direction) and OE (output enable) inputs. Its BiCMOS architecture enables low quiescent current (ICCZ = 10–15 mA) while delivering TTL-compatible output drive strength (IOL = 64 mA on B-side, 24 mA on A-side).
It guarantees high-impedance isolation during power-up/down (VCC < ~3 V), supports 5-V operation only (4.5–5.5 V), and exhibits propagation delays of 1–7 ns (tPLH/tPHL) and enable/disable delays of 1.5–11.8 ns (tPZH/tPLZ) under 50-pF load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - requires stable 5-V rail; not 3.3-V compatible |
| Output Drive (B-side) | 64 mA sink current - drives heavy TTL loads or long traces without external buffers |
| Output Drive (A-side) | 24 mA sink current - suitable for lighter fanout or internal bus loading |
| tPLH / tPHL | 1–7 ns - enables high-speed bus arbitration in legacy microprocessor systems |
| ICCZ (Quiescent) | 10–15 mA - BiCMOS design reduces standby power vs. pure bipolar equivalents |
| Operating Temp | −40°C to 85°C - qualified for extended industrial temperature environments |
| ESD Rating | >2000 V HBM - exceeds MIL-STD-883C Method 3015 for board-level robustness |
Pinout & Package
SN64BCT245DW uses a 20-pin SOIC (DW) package with 0.300-inch body width, 1.27-mm pitch, and maximum height of 2.65 mm - compliant with JEDEC MS-013 and IPC-7351 land pattern standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction control input | Low = B→A data flow; High = A→B data flow; TTL-compatible threshold |
| 2–9 (A1–A8) | Port A bidirectional I/O | 8-bit data path connected to local bus or microcontroller data lines |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents |
| 11–18 (B1–B8) | Port B bidirectional I/O | 8-bit data path connected to peripheral or expansion bus |
| 19 (OE) | Output enable input | Active-low; forces all outputs into high-Z when high |
| 20 (VCC) | Positive supply | 5-V only; decoupling capacitor required near pin for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces ICCZ by >50% versus legacy bipolar BCT transceivers, lowering system power at idle |
| Power-up/power-down high-Z | Prevents bus contention during supply ramping - critical for hot-swap or multi-rail systems |
| TTL-compatible input thresholds | VIH = 2.0 V min, VIL = 0.8 V max - interfaces directly with 5-V microcontrollers and logic families |
| Asymmetric output drive | B-side delivers 64 mA sink vs. A-side's 24 mA - optimized for driving external buses with higher capacitive load |
| SOIC-20 footprint | Standardized 7.6 × 12.8 mm outline with 1.27-mm pitch - supports automated assembly and rework |
Applications
| Industrial Backplane Interface | Legacy Microprocessor Bus Extension |
|---|---|
Use Scenario: Interfacing a 5-V microcontroller bus to a distributed I/O module over a 15-cm PCB trace. IC Role / Device Role / Timing Role: Bidirectional level-shifting and bus isolation transceiver with direction control. Use Value: Prevents bus contention during reset via guaranteed high-Z state below 3 V; 64 mA B-side drive sustains signal integrity over long traces. | Use Scenario: Expanding address/data bus width in an 80C88-based embedded controller using ISA-style expansion slots. IC Role / Device Role / Timing Role: Octal bidirectional data path controlled by CPU address strobes and direction signals. Use Value: 1–7 ns propagation delay meets tight timing budgets of 8-MHz bus cycles; SOIC-20 fits dense legacy board layouts. |
| Memory-Mapped Peripheral Bridge | Test Equipment Data Capture Interface |
Use Scenario: Connecting FPGA-configured peripherals to a fixed-function 5-V ASIC via shared memory-mapped registers. IC Role / Device Role / Timing Role: Isolating and routing register read/write traffic between two synchronous domains. Use Value: OE-controlled tri-state allows dynamic bus sharing without hardware arbitration logic; 24 mA A-side matches ASIC I/O drive capability. | Use Scenario: Capturing parallel digital waveform data from DUT (device under test) into a 5-V logic analyzer front-end. IC Role / Device Role / Timing Role: Transient bus buffer isolating acquisition logic from noisy DUT signals. Use Value: ESD protection >2000 V HBM prevents latch-up during probe contact; high-Z during power-down avoids back-driving DUT. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74BCT245N | Dual-in-line (DIP-20) package; identical electrical specs and pinout | Suitable for through-hole prototyping or legacy repair; lacks SOIC thermal performance | Select SN74BCT245N only for hand-soldered evaluation or field replacement where SOIC rework is impractical |
| SN64BCT244DW | Octal buffer (non-inverting, unidirectional); no DIR pin; A→B only | Used where bus direction is fixed; eliminates DIR control logic but loses bidirectional flexibility | Choose SN64BCT244DW when system architecture mandates one-way data flow and space permits functional simplification |
Compared with SN74BCT245N and SN64BCT244DW, the SN64BCT245DW uniquely combines SOIC-20 surface-mount compatibility, full bidirectional control, and industrial temperature rating - making it optimal for new production of compact, thermally constrained 5-V bus interface designs.
Availability
SN64BCT245DW is available at Aetrix Electronics and suitable for industrial backplane interface, legacy microprocessor bus extension, and memory-mapped peripheral bridge applications requiring stable component supply and long-term lifecycle support.
Supply support for SN64BCT245DW 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN64BCT245DW belongs to TI's legacy BCT (Bipolar-CMOS Transceiver) logic family, engineered for high-speed, low-power 5-V bus interfacing in industrial control and computing infrastructure.
FAQ
What is the operating voltage range for the SN64BCT245DW?
The SN64BCT245DW operates strictly within 4.5 V to 5.5 V. It is not rated for 3.3-V operation, and applying voltages outside this range may cause permanent damage. The absolute maximum VCC is 7 V, but functional operation is guaranteed only across the recommended 4.5–5.5 V window specified in the datasheet.
Does the SN64BCT245DW support hot insertion or live bus connection?
Yes - the SN64BCT245DW enters a guaranteed high-impedance state when VCC drops below approximately 3 V, preventing bus contention during power-up or power-down sequences. This behavior, combined with its >2000 V HBM ESD rating, makes the SN64BCT245DW suitable for controlled hot-swap scenarios in industrial backplanes where supply sequencing is managed.
What is the pinout compatibility between SN64BCT245DW and SN74BCT245N?
The SN64BCT245DW and SN74BCT245N share identical pin functions and logic behavior across all 20 pins. The only difference is package type: DW is SOIC-20, N is PDIP-20. Signal mapping, DIR/OE polarity, and A/B port assignments are fully aligned - enabling direct PCB footprint substitution where mechanical constraints allow.
Can the SN64BCT245DW drive standard TTL loads reliably?
Yes - the SN64BCT245DW delivers 64 mA sink current on B-side outputs and 24 mA on A-side outputs, exceeding the −16 mA standard TTL input requirement. Its VOH ≥ 2.0 V (at IOH = −15 mA) and VOL ≤ 0.55 V (at IOL = 64 mA) ensure robust noise margins and fanout capability across full temperature and voltage ranges.
Is the SN64BCT245DW RoHS compliant and what is its MSL rating?
Yes - the SN64BCT245DW is RoHS compliant with NiPdAu (NIPDAU) lead finish and carries a JEDEC MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH), meaning it can be assembled without baking or special handling per J-STD-020. Its marking "6BCT245" appears on the top surface of the SOIC-20 body.
SN64BCT245DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 64BCT
- 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; 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN64BCT245DW FAQ
1.How can I place an order for SN64BCT245DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN64BCT245DW 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 SN64BCT245DW reliable?
The price and inventory of SN64BCT245DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT245DW is usually 5 days.
3.What payment methods are accepted for SN64BCT245DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT245DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN64BCT245DW?
SN64BCT245DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN64BCT245DW 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 SN64BCT245DW?
For technical support, including SN64BCT245DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT245DW requirements.
6.How does Aetrix verify that SN64BCT245DW is sourced from the original manufacturer or authorized distributors?
All SN64BCT245DW 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 SN64BCT245DW meets industry standards.
7.What is the process for return or replacement of SN64BCT245DW?
All SN64BCT245DW units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT245DW, 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 SN64BCT245DW part is unused and in its original packaging.
Return procedure for SN64BCT245DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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