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Texas Instruments SN74BCT245PW
- Part No.:
- SN74BCT245PW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74BCT245PW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,680
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Product details
Overview
SN74BCT245PW from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in memory address register buffering and system bus isolation applications. It operates at 4.5–5.5 V, supports 128 mA sink current on B-port outputs, features 7 ns max propagation delay (tPLH/tPHL), and delivers 64 mA low-level output drive on B port.
For engineers reviewing the SN74BCT245PW datasheet, SN74BCT245PW pinout, SN74BCT245PW application, or SN74BCT245PW equivalent, this page provides verified electrical specifications, TSSOP-20 package layout, real-world use cases in industrial control backplanes and legacy bus interfaces, and validated alternative parts for design continuity.
Technical Context
The SN74BCT245PW implements TTL-compatible bipolar transistor-transistor logic (BCT) architecture, enabling high-speed switching with controlled edge rates to minimize bus contention. Its DIR input selects data direction (A→B or B→A), while OE enables/disables all outputs simultaneously into high-impedance state.
It integrates ESD protection exceeding 2000-V HBM, operates across 0°C to 70°C ambient, and maintains stable VOH ≥2.4 V (IOH = –15 mA) and VOL ≤0.42 V (IOL = 64 mA) under full load - critical for reliable interfacing with 5-V CMOS/TTL systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V logic rails and tolerance against supply ripple. |
| B-Port IOL | 64 mA - drives heavy capacitive loads (e.g., long PCB traces or multiple inputs) without signal degradation. |
| Propagation Delay | ≤7 ns (tPLH/tPHL) - enables operation in high-speed bus cycles up to ~100 MHz in short-path configurations. |
| 3-State Enable Time | tPZL ≤11.6 ns - guarantees fast bus release during dynamic arbitration or hot-swap scenarios. |
| ESD Rating | 2000-V HBM - meets JESD22-A114A for robust handling in manufacturing and field service environments. |
| Thermal Impedance | θJA = 83°C/W (TSSOP) - defines maximum power dissipation limit (~150 mW at ΔT = 12.5°C rise) for board-level thermal design. |
Pinout & Package
TSSOP-20 (PW) package: 6.95 mm × 4.4 mm × 1.2 mm body, 0.65 mm lead pitch, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | High = A→B data flow; Low = B→A - determines real-time bus traffic direction without external logic. |
| 2–9 (A1–A8) | A-Side Data Inputs/Outputs | Bidirectional I/O pins connected to local subsystem bus; high-impedance when OE = high. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output drivers; must be low-inductance connection. |
| 11 (VCC) | Power Supply | +5 V supply for internal logic and output stage; requires local 0.1 µF ceramic decoupling. |
| 12 (OE) | Output Enable Input | Active-low control: OE = low enables transceiver; OE = high places all A/B ports in 3-state. |
| 13–20 (B1–B8) | B-Side Data Inputs/Outputs | Bidirectional I/O pins connected to main system bus; electrically isolated from A side when disabled. |
Key Features
| Feature | Design Value |
|---|---|
| Octal Bidirectional Bus Interface | Enables single-chip replacement of eight discrete buffers, reducing component count and PCB area in bus-hub designs. |
| 3-State Outputs with Fast Disable | tPZL/tPLZ ≤11.6 ns ensures minimal bus contention during mode switching - essential for multi-master arbitration. |
| High Sink Current on B Port | 64 mA per B-pin supports direct driving of legacy TTL loads or fan-out to ≥10 LS-TTL inputs without external drivers. |
| TTL-Compatible Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - guarantees interoperability with standard 5-V TTL and CMOS logic families. |
| Industrial Temperature Range | 0°C to 70°C operation - validated for deployment in commercial and industrial control equipment with passive cooling. |
Applications
| Industrial Backplane Interface | Memory Address Register Buffer |
|---|---|
Use Scenario: Isolating CPU address lines from peripheral expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional buffer managing address propagation between microcontroller and modular I/O cards; DIR set statically, OE toggled per slot access. Use Value: Prevents address bus contention during hot-plug events and sustains signal integrity over 15 cm backplane traces at 20 MHz clock rates. |
Use Scenario: Driving multiplexed address/data buses in 8-bit microprocessor-based instrumentation systems. IC Role / Device Role / Timing Role: Latched address driver that holds stable addresses during memory read/write cycles; OE synchronized to ALE signal. Use Value: Eliminates need for separate address latches and reduces timing skew between address bits by <1 ns. |
| Legacy System Bus Bridge | Test Equipment Signal Routing |
Use Scenario: Interfacing ISA-bus peripherals with modern FPGA-based controller boards in calibration hardware. IC Role / Device Role / Timing Role: Protocol-transparent transceiver translating between 5-V ISA data bus and FPGA I/O banks; DIR controlled by bus master status. Use Value: Maintains signal fidelity across 25 cm ribbon cables with <0.5 V noise margin at 8 MHz sustained throughput. |
Use Scenario: Dynamic signal path selection in automated test fixtures routing DUT signals to measurement instruments. IC Role / Device Role / Timing Role: Reconfigurable bus switch enabling software-defined instrument channel assignment; OE used for channel enable/disable. Use Value: Supports sub-10 ns path reconfiguration latency and eliminates mechanical relay wear in high-cycle production testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APWR | CMOS-based, 1.65–3.6 V supply, lower drive (24 mA), 3.3-V I/O only | Requires level-shifting for 5-V systems; unsuitable for direct TTL load driving | Select when migrating to low-voltage logic and power-sensitive designs; not drop-in for 5-V legacy interfaces. |
| SN74ABT245N | Bipolar ABT family, same 5-V operation, higher speed (tPLH ≤ 4.2 ns), 64 mA B-port drive | Pin-compatible but requires updated thermal layout due to higher ICCZ (15 mA vs. 10 mA) | Choose for performance-critical upgrades where reduced propagation delay justifies minor layout revision. |
Compared with SN74BCT245PW, SN74LVC245APWR offers lower power and voltage flexibility but lacks native 5-V drive capability, while SN74ABT245N delivers faster timing and identical voltage compatibility but increases quiescent current - making each suitable for distinct design priorities: legacy interface retention, voltage migration, or speed optimization.
Availability
SN74BCT245PW is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory address buffering, legacy bus bridging, and automated test equipment requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT245PW 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 SN74BCT245PW belongs to TI's legacy BCT logic family, engineered specifically for robust 5-V bus interfacing in industrial control, test instrumentation, and retrofitted computing systems where TTL compatibility and high drive strength are mandatory.
FAQ
What is the operating temperature range for SN74BCT245PW?
The SN74BCT245PW is rated for 0°C to 70°C ambient operation, matching the commercial temperature grade of the SN74BCT245 family. This range is validated per TI's recommended operating conditions and supports deployment in enclosed industrial enclosures without forced airflow, provided board-level thermal design limits junction temperature to ≤125°C.
Does SN74BCT245PW support bidirectional data flow without external logic?
Yes, SN74BCT245PW supports fully bidirectional data flow using its dedicated DIR pin: logic high enables A→B transmission, logic low enables B→A transmission. No external gates or control sequencing are required - the transceiver handles directionality internally, simplifying bus arbitration in multi-master systems.
Can SN74BCT245PW drive standard TTL loads directly?
Yes, SN74BCT245PW can drive standard TTL loads directly: its B-port outputs deliver up to 64 mA sink current (IOL), sufficient for ≥10 LS-TTL inputs or direct connection to 5-V TTL bus lines. The A-port supports 24 mA, adequate for lighter loads or feedback paths.
What is the maximum propagation delay of SN74BCT245PW at 5 V?
The maximum propagation delay (tPLH/tPHL) of SN74BCT245PW is 7 ns at VCC = 5 V, CL = 50 pF, and TA = 25°C. Under worst-case conditions (TA = 70°C, VCC = 4.5 V), the datasheet specifies 7.2 ns - ensuring predictable timing margins in synchronous bus designs up to 80 MHz.
Is SN74BCT245PW pin-compatible with other packages in the SN74BCT245 family?
Yes, SN74BCT245PW shares identical 20-pin functional mapping with SN74BCT245DBR (SSOP), SN74BCT245DWR (SOIC), and SN74BCT245N (PDIP). Pin functions - including DIR (pin 1), OE (pin 12), GND (pin 10), and VCC (pin 11) - are consistent across all variants, enabling direct PCB footprint substitution where package height and thermal constraints allow.
SN74BCT245PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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-TSSOP
SN74BCT245PW FAQ
1.How can I place an order for SN74BCT245PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT245PW 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 SN74BCT245PW reliable?
The price and inventory of SN74BCT245PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT245PW is usually 5 days.
3.What payment methods are accepted for SN74BCT245PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT245PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT245PW?
SN74BCT245PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT245PW 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 SN74BCT245PW?
For technical support, including SN74BCT245PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT245PW requirements.
6.How does Aetrix verify that SN74BCT245PW is sourced from the original manufacturer or authorized distributors?
All SN74BCT245PW 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 SN74BCT245PW meets industry standards.
7.What is the process for return or replacement of SN74BCT245PW?
All SN74BCT245PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT245PW, 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 SN74BCT245PW part is unused and in its original packaging.
Return procedure for SN74BCT245PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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