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Texas Instruments SN74ABT245BDGVR
- Part No.:
- SN74ABT245BDGVR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ABT245BDGVR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,373
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Product details
Overview
SN74ABT245BDGVR 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 digital systems. It features high-drive outputs (−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 control backplanes and legacy system interconnects requiring robust level-shifting and bus isolation.
For engineers reviewing the SN74ABT245BDGVR datasheet, SN74ABT245BDGVR pinout, SN74ABT245BDGVR application, or SN74ABT245BDGVR equivalent, key selection criteria include its TVSOP-20 (DGV) package thermal resistance (92°C/W), propagation delay (≤3.9 ns), output ground bounce (<1 V), latch-up immunity (>500 mA), and compatibility with TTL-level control signals.
Technical Context
This device implements dual-directional 8-bit data flow controlled by DIR and OE inputs: DIR = L enables B→A transmission; DIR = H enables A→B transmission; OE = H forces all outputs into high-impedance isolation. The Ioff circuitry actively disables outputs when VCC = 0 V, preventing backflow current during hot insertion or partial power-down.
It meets JEDEC JESD 17 latch-up requirements (>500 mA), exceeds JESD 22 ESD ratings (2000-V HBM, 200-V MM), and specifies guaranteed switching performance at 5-V supply with CL = 50 pF. Input thresholds are TTL-compatible (VIH = 2 V min, VIL = 0.8 V max), and output drive strength is asymmetric-optimized for driving heavy capacitive loads on one side while maintaining clean signal integrity on the other.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5-V rail tolerances without regulation overhead. |
| IOH / IOL | −32 mA / 64 mA - Delivers sufficient sink/source current to drive multiple TTL loads or long PCB traces. |
| tPLH / tPHL | ≤3.9 ns - Enables high-speed bus arbitration in real-time control and instrumentation interfaces. |
| VOL / VOH | ≤0.55 V @ 64 mA / ≥2.5 V @ −32 mA - Guarantees noise margins >0.4 V under full load for reliable logic-level interpretation. |
| θJA (DGV) | 92°C/W - Requires minimal heatsinking in compact industrial modules operating up to 85°C ambient. |
| Ioff | ±100 μA @ VCC = 0 - Prevents damaging backfeed current during live board replacement or staged power sequencing. |
| ESD Rating | 2000-V HBM, 200-V MM - Supports handling and assembly in non-ESD-controlled environments without additional protection. |
Pinout & Package
SN74ABT245BDGVR is housed in a 20-pin Thin Very Small Outline Package (TVSOP, DGV), measuring 6.9 mm × 5.6 mm × 1.2 mm max height, with 0.5-mm lead pitch and exposed thermal pad (pin 21 not electrically connected). The package complies with JEDEC MO-153 and is RoHS-compliant with NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A-side data inputs/outputs | Bidirectional I/O ports tied to A bus; direction determined by DIR and OE states. |
| 9 | OE (Output Enable) | Active-low control: OE = L enables transceiver; OE = H places all A/B outputs in high-Z state. |
| 10 | DIR (Direction Control) | Controls data flow direction: DIR = L → B-to-A; DIR = H → A-to-B. |
| 11, 12, 13, 14, 15, 16, 17, 18 | B-side data inputs/outputs | Bidirectional I/O ports tied to B bus; functionally mirrored to A-side pins. |
| 19 | GND | Primary ground reference for logic and output drivers; must be low-impedance connection. |
| 20 | VCC | 5-V supply input; decoupling capacitor (0.1 μF) required within 5 mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Hot-insertion support | Enabled by Ioff and power-up 3-state circuits - eliminates need for external bus switches or sequencing logic during field upgrades. |
| High-drive capability | 64-mA sink current allows direct interface to 10+ TTL loads or 15-cm PCB traces without buffer amplification. |
| Low ground bounce | <1 V typical VOLP at 5 V/25°C - maintains signal integrity in dense multi-transceiver backplane designs. |
| Latch-up immunity | Exceeds 500 mA per JESD 17 - ensures robustness against transient overcurrent events in industrial power environments. |
| TTL-compatible thresholds | VIH = 2 V min, VIL = 0.8 V max - interoperates seamlessly with legacy 74-series and microcontroller GPIO without level shifters. |
Applications
| Industrial Backplane Interconnect | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Isolating and extending parallel data buses between PLC I/O modules and main controller chassis. IC Role / Device Role / Timing Role: Bidirectional bus transceiver enabling synchronous A↔B data exchange under programmable DIR/OE control. Use Value: Eliminates timing skew between extended bus segments while maintaining TTL-compatible voltage levels and drive strength. |
Use Scenario: Adding peripheral expansion slots to aging embedded controllers using 8-bit ISA-style buses. IC Role / Device Role / Timing Role: Level-shifting and direction-controlled bridge between host CPU bus and add-on card bus. Use Value: Provides hot-plug-safe isolation and 64-mA drive to overcome trace capacitance in retrofitted expansion backplanes. |
| Test Equipment Signal Routing | Automated Manufacturing Fixture Interface |
|
Use Scenario: Configurable signal path switching inside automated test equipment for DUT stimulus/response routing. IC Role / Device Role / Timing Role: Programmable 8-bit bus gate with deterministic enable/disable timing (tPZL ≤ 4.5 ns). Use Value: Enables sub-5-ns channel switching accuracy critical for high-speed digital pattern generation and capture. |
Use Scenario: Interfacing programmable logic controllers to fixture-mounted sensors and actuators in SMT line test stations. IC Role / Device Role / Timing Role: Robust bus isolator protecting controller GPIO from ESD and latch-up during repeated fixture mating cycles. Use Value: Survives >10,000 hot-insertion cycles due to Ioff protection and 2000-V HBM rating, reducing fixture downtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245BDWR | SOIC-20 (DW) package; θJA = 58°C/W vs. DGV's 92°C/W; same electrical specs and pinout. | Better thermal performance in convection-cooled boards; larger footprint (12.8 mm × 7.5 mm) limits high-density layouts. | Select when board space permits and thermal headroom is constrained; no schematic or firmware changes needed. |
| SN74LVC245AQPWRQ1 | Automotive-grade (AEC-Q100); 1.65–3.6 V operation; lower drive (−24/24 mA); different pinout (OE/DIR swapped). | Supports modern low-voltage MCUs but lacks 5-V compatibility and hot-insertion Ioff circuitry. | Choose only for new automotive designs requiring 3.3-V operation and qualification; requires PCB redesign and logic-level validation. |
Compared with SN74ABT245BDWR and SN74LVC245AQPWRQ1, the SN74ABT245BDGVR uniquely balances compact TVSOP packaging, 5-V hot-insertion robustness, and legacy-system compatibility-making it optimal for space-constrained industrial upgrades where thermal load is moderate and voltage rails remain at 5 V.
Availability
SN74ABT245BDGVR is available at Aetrix Electronics and suitable for industrial backplane interconnect, legacy system bus extension, test equipment signal routing, and automated manufacturing fixture interface requiring stable component supply and long-term lifecycle support.
Supply support for SN74ABT245BDGVR 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 decades of experience in industrial-grade logic and interface solutions.
The SN74ABT245B product line delivers high-speed, hot-pluggable bus transceivers for legacy 5-V system integration-designed specifically for reliability in harsh industrial environments and backward compatibility with established architectures.
FAQ
What is the maximum recommended operating temperature for SN74ABT245BDGVR?
The SN74ABT245BDGVR is rated for continuous operation from −40°C to +85°C ambient temperature. Its TVSOP package has a thermal resistance (θJA) of 92°C/W, so internal junction temperature remains within safe limits under typical industrial airflow conditions with ≤100 mW power dissipation. Always verify board-level thermal design using TI's thermal simulation models.
Does SN74ABT245BDGVR support true bidirectional data flow without external logic?
Yes. The SN74ABT245BDGVR natively supports bidirectional data flow using only two control inputs: DIR selects direction (A→B or B→A), and OE enables/disables the entire transceiver. No external gates or microcontroller intervention is needed for basic bus arbitration-enabling simple, deterministic hardware-level control in real-time systems.
Can SN74ABT245BDGVR be used in 3.3-V systems?
No. The SN74ABT245BDGVR is specified only for 4.5–5.5 V operation. Its input thresholds (VIH = 2 V min) and output drive characteristics are optimized for 5-V TTL compatibility. Using it with 3.3-V logic may cause unreliable switching or excessive ICC current; for 3.3-V systems, consider SN74LVC245A instead.
How does the Ioff feature protect SN74ABT245BDGVR during hot insertion?
The Ioff circuitry in SN74ABT245BDGVR disables all outputs when VCC = 0 V, limiting current flow to ±100 μA even if live signals are present on A or B buses. This prevents damaging backfeed current into unpowered sections of the system-critical for field-replaceable modules and modular backplane architectures where cards are inserted while powered.
Is SN74ABT245BDGVR pin-compatible with other packages in the SN74ABT245B family?
Yes-SN74ABT245BDGVR shares identical pin numbering and function mapping with all 20-pin variants (DB, DW, PW, NS, RGY, GQN), including A1–A8, B1–B8, DIR, OE, VCC, and GND. Mechanical layout differs, but schematic symbols and netlist assignments remain interchangeable across packages, simplifying design reuse and second-sourcing.
SN74ABT245BDGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TVSOP
SN74ABT245BDGVR FAQ
1.How can I place an order for SN74ABT245BDGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT245BDGVR 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 SN74ABT245BDGVR reliable?
The price and inventory of SN74ABT245BDGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT245BDGVR is usually 5 days.
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SN74ABT245BDGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT245BDGVR 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 SN74ABT245BDGVR?
For technical support, including SN74ABT245BDGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT245BDGVR requirements.
6.How does Aetrix verify that SN74ABT245BDGVR is sourced from the original manufacturer or authorized distributors?
All SN74ABT245BDGVR 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 SN74ABT245BDGVR meets industry standards.
7.What is the process for return or replacement of SN74ABT245BDGVR?
All SN74ABT245BDGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT245BDGVR, 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 SN74ABT245BDGVR part is unused and in its original packaging.
Return procedure for SN74ABT245BDGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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