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Texas Instruments SN74BCT25245DWG4
- Part No.:
- SN74BCT25245DWG4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT25245DWG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74BCT25245DWG4 from Texas Instruments is an octal 25-Ω bus transceiver with bidirectional data flow controlled by DIR and 3-state output control via OE. It delivers 188-mA low-level sink current on the A port, supports 4.5 V to 5.5 V supply, operates from 0°C to 70°C, and is optimized for incident-wave switching on 25-Ω transmission lines in backplane and memory address bus applications.
For engineers reviewing the SN74BCT25245DWG4 datasheet, SN74BCT25245DWG4 pinout, SN74BCT25245DWG4 application, or SN74BCT25245DWG4 equivalent, key selection criteria include its 25-Ω line-driving capability, distributed VCC/GND pin architecture for noise reduction, 3.3 ns typical propagation delay (A→B), and SOIC-24 package compatibility with legacy 74-series bus interface designs.
Technical Context
The SN74BCT25245DWG4 implements BiCMOS logic to achieve high-speed switching while minimizing ICCZ quiescent current. Its dual-bus architecture supports asynchronous bidirectional communication between A and B ports under DIR input control, with independent 3-state enable via OE.
Designed for incident-wave switching, it drives 25-Ω transmission lines without termination at the load end. Distributed power/ground pins reduce simultaneous switching noise, and ESD protection exceeds 2000 V (HBM) and 200 V (machine model).
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 margin against rail droop. |
| A-port IOL | 188 mA - enables direct incident-wave switching on 25-Ω lines without external termination resistors. |
| Propagation Delay (A→B) | 1.2 ns (min) to 5.7 ns (max) at 5 V - supports high-speed bus arbitration in memory and address driver applications. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade industrial control and computing equipment environments. |
| ESD Rating | >2000 V HBM - provides robust handling tolerance during PCB assembly and system integration. |
| Package | SOIC-24 (DW) - surface-mount footprint compatible with automated placement and reflow processes. |
| Input Clamp Current | −18 mA - limits voltage excursion during transient overvoltage events on control inputs. |
Pinout & Package
SN74BCT25245DWG4 is housed in a 24-pin SOIC (DW) package with gull-wing leads, 1.27 mm pitch, and JEDEC MS-013 compliant dimensions (7.5 mm × 15.4 mm). Pin 1 is marked with a beveled corner or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A1) | A-side data input/output | Bi-directional I/O terminal for first bit of A bus; driven low to 0.7 V at 188 mA sink. |
| 2 (GND) | Ground reference | Dedicated ground pin adjacent to A1 to minimize local return path inductance. |
| 3 (A2) | A-side data input/output | Second A-port bit; shares same drive strength and timing as A1–A8. |
| 12 (A8) | A-side data input/output | Last A-port bit; electrically identical to A1–A7. |
| 13 (DIR) | Direction control input | Active-HIGH signal selecting A→B data flow; low enables B→A transfer. |
| 14 (B1) | B-side data input/output | First bit of B bus; sinks 24 mA max at 0.5 V output low. |
| 24 (OE) | Output enable input | Active-LOW control disabling both A and B ports into high-impedance state. |
| 23 (B8) | B-side data input/output | Last B-port bit; matches B1–B7 in electrical specs and timing. |
| VCC (Pins 11, 16, 20) | Power supply | Three distributed VCC pins reduce simultaneous switching noise across all eight channels. |
| GND (Pins 2, 5, 8, 10, 19) | Ground return | Five dedicated GND pins provide low-inductance return paths for each functional group. |
Key Features
| Feature | Design Value |
|---|---|
| 25-Ω line driving capability | 188-mA A-port sink current enables clean incident-wave switching on unterminated 25-Ω traces without stub reflections. |
| Distributed VCC/GND pin architecture | Three VCC and five GND pins suppress simultaneous switching noise, improving signal integrity in dense bus layouts. |
| BiCMOS process technology | Reduces ICCZ quiescent current versus bipolar-only equivalents, lowering static power in idle bus states. |
| High ESD immunity | Exceeds 2000 V per MIL-STD-883C Method 3015, supporting reliable handling in non-ESD-controlled assembly environments. |
| Asynchronous bidirectional control | DIR and OE inputs operate independently, allowing flexible bus arbitration and hot-swap isolation without clock dependency. |
Applications
| Memory Address Bus Driver | Backplane Data Transceiver |
|---|---|
|
Use Scenario: Driving multiplexed address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Acts as a high-current, low-delay bidirectional buffer that isolates address drivers from bus loading effects during read/write cycles. Use Value: Eliminates need for external series termination by directly sourcing/sinking 188 mA into 25-Ω trace impedance, preserving edge integrity at >100 MHz toggle rates. |
Use Scenario: Interfacing two independent 8-bit data buses across a long PCB backplane with controlled-impedance routing. IC Role / Device Role / Timing Role: Provides direction-controlled, 3-state-isolated data coupling between upstream and downstream subsystems. Use Value: Distributed power/ground pins reduce crosstalk-induced jitter during full-bus toggling, maintaining <5.7 ns A→B propagation skew across all channels. |
| Legacy TTL System Interface | Industrial Control I/O Expander |
|
Use Scenario: Bridging modern 5-V CMOS logic to legacy TTL-based instrumentation or test equipment with strict VIH/VIL thresholds. IC Role / Device Role / Timing Role: Functions as a level-compatible, high-drive transceiver ensuring VIH ≥ 2.0 V and VOL ≤ 0.55 V across temperature range. Use Value: Guaranteed VOH ≥ 2.4 V at 3 mA load and VOL ≤ 0.55 V at 125 mA sink meets TTL input requirements without pull-up resistors. |
Use Scenario: Extending GPIO count from a PLC CPU to remote sensor/actuator modules over short-haul PCB traces. IC Role / Device Role / Timing Role: Serves as a ruggedized, noise-immune bus repeater with ESD-hardened I/O for factory-floor environments. Use Value: 2000-V HBM ESD rating and −0.5 V to 5.5 V I/O voltage tolerance protect against field-induced transients in unshielded industrial enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245N | Higher drive (64 mA B-port sink), lower ICCZ (8 mA), but only 50-Ω line optimization-not rated for 25-Ω incident-wave switching. | Best suited for general-purpose 50-Ω bus buffering where trace length exceeds 15 cm; lacks 188-mA A-port sink capability. | Select SN74ABT245N when lower power and higher noise margin are prioritized over 25-Ω line driving. |
| SN74LVC245APW | 3.3-V only operation (1.65–3.6 V), 24-mA sink, no 25-Ω line drive spec; uses CMOS process, not BiCMOS. | Applicable only in mixed-voltage 3.3-V systems; incompatible with 5-V legacy buses and cannot replace SN74BCT25245DWG4 without level-shifting. | Choose SN74LVC245APW only for new 3.3-V designs requiring lower voltage operation and reduced power consumption. |
Compared with SN74ABT245N and SN74LVC245APW, the SN74BCT25245DWG4 uniquely delivers 188-mA A-port sink current for true 25-Ω incident-wave switching, making it irreplaceable in legacy 5-V backplane and memory address driver applications where termination-free signal integrity is required.
Availability
SN74BCT25245DWG4 is available at Aetrix Electronics and suitable for memory address bus drivers, backplane data transceivers, legacy TTL system interfaces, and industrial control I/O expanders requiring stable component supply and long-term obsolescence management.
Supply support for SN74BCT25245DWG4 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 SN74BCT25245DWG4 belongs to TI's legacy BCT (Bipolar-CMOS-Transistor) logic family, engineered specifically for high-speed, high-drive 5-V bus interfacing in memory subsystems and backplane architectures.
FAQ
What is the maximum sink current capability of the A port on the SN74BCT25245DWG4?
The A port of the SN74BCT25245DWG4 is rated for up to 188 mA of low-level output current (IOL) at VCC = 4.5 V and TA = 25°C. This specification is confirmed in the Electrical Characteristics table of the official datasheet and enables direct incident-wave switching on 25-Ω transmission lines without external termination. The SN74BCT25245DWG4 maintains this drive strength across its full commercial temperature range (0°C to 70°C).
Does the SN74BCT25245DWG4 support bidirectional data flow, and how is direction controlled?
Yes, the SN74BCT25245DWG4 supports fully bidirectional asynchronous data transfer between the A and B buses. Direction is controlled by the DIR input: when DIR = LOW, data flows from B to A; when DIR = HIGH, data flows from A to B. This logic-level control operates independently of the OE (output enable) signal, which places both ports in high-impedance state when asserted HIGH. The SN74BCT25245DWG4's function table explicitly defines these states under all valid input combinations.
What package type and pin count does the SN74BCT25245DWG4 use?
The SN74BCT25245DWG4 is packaged in a 24-pin SOIC (Small-Outline Integrated Circuit) with DW suffix, measuring 7.5 mm × 15.4 mm and featuring gull-wing leads on 1.27 mm pitch. This package is RoHS-compliant, has NIPDAU lead finish, and carries JEDEC MSL Level-1 rating for unlimited floor life at 260°C peak reflow. The SN74BCT25245DWG4 pinout includes eight A-port I/Os, eight B-port I/Os, DIR, OE, three VCC, and five GND pins - all verified in the "Top View" mechanical drawing of the datasheet.
Can the SN74BCT25245DWG4 be used in place of the SN74BCT245 series?
No, the SN74BCT25245DWG4 is not a drop-in replacement for SN74BCT245 variants. While both are octal transceivers, the SN74BCT25245DWG4 is specifically optimized for 25-Ω line driving with 188-mA A-port sink current, whereas the SN74BCT245 offers only 64-mA sink and targets 50-Ω systems. Pinouts differ: SN74BCT25245DWG4 uses distributed VCC/GND pins (pins 11, 16, 20 and 2, 5, 8, 10, 19), unlike the single-power-pin layout of SN74BCT245. Substituting the SN74BCT25245DWG4 requires PCB layout revision.
What is the operating temperature range specified for the SN74BCT25245DWG4?
The SN74BCT25245DWG4 is characterized for commercial-grade operation from 0°C to 70°C ambient temperature, as stated in the Recommended Operating Conditions table of the datasheet. This range applies to all electrical specifications including propagation delay, drive strength, and voltage thresholds. The device is not rated for extended temperature ranges such as −40°C to 85°C or −55°C to 125°C - those apply only to the SN54BCT25245 variant. All performance claims for the SN74BCT25245DWG4 assume compliance with this 0°C to 70°C envelope.
SN74BCT25245DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 80mA, 188mA; 3mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74BCT25245DWG4 FAQ
1.How can I place an order for SN74BCT25245DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT25245DWG4 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 SN74BCT25245DWG4 reliable?
The price and inventory of SN74BCT25245DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT25245DWG4 is usually 5 days.
3.What payment methods are accepted for SN74BCT25245DWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT25245DWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT25245DWG4?
SN74BCT25245DWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT25245DWG4 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 SN74BCT25245DWG4?
For technical support, including SN74BCT25245DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT25245DWG4 requirements.
6.How does Aetrix verify that SN74BCT25245DWG4 is sourced from the original manufacturer or authorized distributors?
All SN74BCT25245DWG4 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 SN74BCT25245DWG4 meets industry standards.
7.What is the process for return or replacement of SN74BCT25245DWG4?
All SN74BCT25245DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT25245DWG4, 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 SN74BCT25245DWG4 part is unused and in its original packaging.
Return procedure for SN74BCT25245DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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