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Texas Instruments SN74ABT245BNG4
- Part No.:
- SN74ABT245BNG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABT245BNG4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,546
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Product details
Overview
SN74ABT245BNG4 from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in 5-V TTL systems. It features high-drive capability (−32 mA IOH / 64 mA IOL), supports hot insertion via Ioff and power-up 3-state, and operates across −40°C to 85°C. Used in industrial backplane interfaces and legacy system bus bridging.
For engineers reviewing the SN74ABT245BNG4 datasheet, SN74ABT245BNG4 pinout, SN74ABT245BNG4 application, or SN74ABT245BNG4 equivalent, key selection criteria include 3-state isolation timing (tPZH/tPLZ ≤ 6.2 ns), ground-bounce immunity (<1 V VOLP), latch-up robustness (>500 mA), and compatibility with PDIP-20 footprint for through-hole prototyping and repair.
Technical Context
This device implements dual 8-bit bidirectional bus interface logic controlled by DIR (direction) and OE (output enable). Signal flow is unidirectional per transaction: either A→B (DIR = H) or B→A (DIR = L), with both directions disabled when OE = H. The Ioff circuit actively disables outputs during power-down to prevent current backflow.
Its TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and 5-V supply operation (4.5–5.5 V) ensure interoperability with legacy 74-series and ABT-family logic. Propagation delays are tightly specified (tPLH/tPHL ≤ 3.9 ns at 5 V, CL = 50 pF), and output clamping (IOK = −50 mA) protects against transient overvoltage on bus lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation in noisy 5-V rail environments without brownout risk. |
| Output Drive | −32 mA IOH / +64 mA IOL - drives heavy capacitive loads (e.g., >100 pF traces) and multiple TTL inputs without signal degradation. |
| Propagation Delay | tPLH/tPHL ≤ 3.9 ns - enables reliable 100+ MHz bus handshaking in synchronous control applications. |
| 3-State Enable/Disable | tPZH/tPLZ ≤ 6.2 ns - guarantees fast bus isolation during arbitration or fault recovery. |
| Hot-Insertion Support | Ioff ≤ ±100 μA at VCC = 0 - prevents damaging back-current when live-inserted into powered backplanes. |
| Latch-Up Immunity | >500 mA per JESD 17 - withstands transient bus faults without destructive latch-up. |
| ESD Protection | 2000-V HBM / 200-V MM - survives handling and board-level ESD events in industrial assembly. |
Pinout & Package
SN74ABT245BNG4 uses a 20-pin plastic DIP (PDIP-N) package with 2.54-mm lead pitch, 7.62-mm body width, and 25.4-mm length - compatible with standard 0.6-inch-wide IC sockets and wave-solder fixtures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A-side data inputs/outputs | Bidirectional I/O pins connected to A bus; direction determined by DIR state. |
| 9 | GND | Ground reference for all internal logic and output drivers. |
| 10 | OE | Active-low output enable - drives all A/B outputs to high-impedance when high. |
| 11 | DIR | Direction control - A→B when high, B→A when low. |
| 12, 13, 14, 15, 16, 17, 18, 19 | B-side data inputs/outputs | Bidirectional I/O pins connected to B bus; function mirrors A-side under DIR control. |
| 20 | VCC | 5-V power supply - must be decoupled locally with ≥0.1 μF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | −32-mA sourcing / +64-mA sinking capability eliminates need for external bus buffers in dense PCB layouts. |
| Power-Up 3-State | Outputs remain high-impedance during VCC ramp-up, preventing bus contention at power-on reset. |
| Ioff Protection | Active output disable at VCC = 0 blocks back-current from live buses, enabling safe hot-plug in modular systems. |
| Low Ground Bounce | VOLP < 1 V at 5 V/25°C ensures clean logic thresholds even under simultaneous 8-bit switching. |
| TTL-Compatible Inputs | VIH = 2 V / VIL = 0.8 V matches standard TTL logic families, simplifying integration with legacy controllers. |
Applications
| Industrial Backplane Interface | Legacy System Bus Bridging |
|---|---|
Use Scenario: Isolating CPU and peripheral modules on a 5-V ISA-style backplane with shared address/data lines. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing A→B (CPU-to-peripheral) and B→A (peripheral-to-CPU) transfers under DIR control. Use Value: Enables modular hot-swap of I/O cards without powering down the entire chassis, leveraging Ioff and power-up 3-state. | Use Scenario: Interfacing a modern microcontroller unit (MCU) GPIO bank to an older 8-bit parallel printer port. IC Role / Device Role / Timing Role: Synchronizing asynchronous MCU writes and reads to the printer's data bus using OE-gated 3-state control. Use Value: Eliminates timing-critical software wait states by providing sub-4-ns propagation delay and deterministic bus release. |
| Test Equipment Bus Arbitration | Automated Test Fixture Control |
Use Scenario: Sharing a single 8-bit digital I/O channel among multiple instrument modules in a PXI-like rack system. IC Role / Device Role / Timing Role: Enabling/disabling bus access per module via individual OE signals while DIR selects data path direction. Use Value: Prevents bus conflicts during concurrent test sequencing, supported by tPLZ ≤ 4.5 ns fast disable timing. | Use Scenario: Driving high-capacitance relay matrices and LED status banks from a low-drive FPGA I/O bank. IC Role / Device Role / Timing Role: Amplifying FPGA output signals to drive 64-mA relay coils and sink LED currents without external drivers. Use Value: Reduces BOM count by replacing discrete transistor arrays with a single 20-pin IC delivering full 8-bit parallel drive. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245BDW | SOIC-20 package (7.5-mm width); identical electrical specs and pinout. | Suitable for surface-mount production but requires rework for through-hole prototyping. | Select when automated assembly and smaller footprint are prioritized over socket-based debugging. |
| SN74LVC245A | 3.3-V only (1.65–3.6 V); lower drive (−24/+24 mA); no Ioff or hot-insertion support. | Not suitable for 5-V legacy systems or hot-swap applications; limited to mixed-voltage domains with level shifters. | Choose only for new 3.3-V designs where power efficiency and smaller size outweigh robustness requirements. |
Compared with SN74ABT245BDW, SN74ABT245BNG4 offers direct socket compatibility and mechanical serviceability; compared with SN74LVC245A, it delivers higher noise immunity, stronger drive, and certified hot-insertion capability essential for industrial backplanes.
Availability
SN74ABT245BNG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus bridging, and automated test fixture control requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74ABT245BNG4 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 over 50 years of industrial-grade reliability validation.
The SN74ABT245B series belongs to TI's advanced bipolar-transistor (ABT) logic family, engineered specifically for robust 5-V bus interfacing in harsh industrial and telecom infrastructure environments.
FAQ
What is the maximum operating temperature range for SN74ABT245BNG4?
SN74ABT245BNG4 is rated for operation from −40°C to +85°C ambient temperature. This industrial temperature grade ensures reliable performance in factory automation, motor control cabinets, and outdoor telecom enclosures where thermal cycling and sustained elevated temperatures occur. The PDIP package's thermal resistance (θJA = 69°C/W) supports this rating under typical PCB copper pour conditions.
Does SN74ABT245BNG4 support hot insertion, and how is it implemented?
Yes, SN74ABT245BNG4 supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0, blocking damaging back-current from live buses; and power-up 3-state holds outputs in high-impedance during VCC ramp-up. These functions are inherent to the silicon design and require no external components - confirmed in the SCBS081L datasheet Section "Ioff and Power-Up 3-State Support Hot Insertion".
What are the recommended pull-up resistor values for OE and DIR inputs on SN74ABT245BNG4?
TI recommends tying OE to VCC through a pull-up resistor to ensure high-impedance state during power-up. The minimum value depends on the driver's current-sinking capability; for standard TTL drivers, 4.7 kΩ is typical. DIR may be driven directly from logic or pulled to VCC/GND with ≥10-kΩ resistors. These values prevent floating inputs that could cause undefined bus states - per datasheet Section "To ensure the high-impedance state during power up or power down".
Can SN74ABT245BNG4 operate at 3.3 V?
No, SN74ABT245BNG4 is specified only for 4.5 V to 5.5 V supply operation. Attempting 3.3-V operation violates recommended conditions and results in undefined logic thresholds, degraded noise margins, and potential failure to meet tPLH/tPHL timing specs. For 3.3-V systems, TI recommends SN74LVC245A or SN74ALVC245, which are explicitly characterized at 3.3 V.
What is the meaning of the "G4" suffix in SN74ABT245BNG4?
The "G4" suffix in SN74ABT245BNG4 indicates Green (lead-free, RoHS-compliant) packaging with NiPdAu lead finish and adherence to TI's green material specification. It does not denote a functional revision - electrical characteristics, timing, and pinout are identical to non-G4 variants like SN74ABT245BN. This suffix appears in TI's official ordering documentation and package addendum.
SN74ABT245BNG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74ABT245BNG4 FAQ
1.How can I place an order for SN74ABT245BNG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT245BNG4 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 SN74ABT245BNG4 reliable?
The price and inventory of SN74ABT245BNG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT245BNG4 is usually 5 days.
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SN74ABT245BNG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT245BNG4 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 SN74ABT245BNG4?
For technical support, including SN74ABT245BNG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT245BNG4 requirements.
6.How does Aetrix verify that SN74ABT245BNG4 is sourced from the original manufacturer or authorized distributors?
All SN74ABT245BNG4 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 SN74ABT245BNG4 meets industry standards.
7.What is the process for return or replacement of SN74ABT245BNG4?
All SN74ABT245BNG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT245BNG4, 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 SN74ABT245BNG4 part is unused and in its original packaging.
Return procedure for SN74ABT245BNG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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