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Texas Instruments SN74ABTH245DWR
- Part No.:
- SN74ABTH245DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABTH245DWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,604
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Product details
Overview
SN74ABTH245DWR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in industrial and embedded systems. It features high-drive outputs (–32 mA IOH, 64 mA IOL), bus-hold circuitry eliminating external pull resistors, and Ioff support for hot insertion. Operates over –40°C to 85°C with 4.5 V–5.5 V supply.
For engineers reviewing the SN74ABTH245DWR datasheet, SN74ABTH245DWR pinout, SN74ABTH245DWR application, or SN74ABTH245DWR equivalent, this page delivers verified electrical specs, SOIC-20 package details, hot-swap capability validation, bus-hold behavior, and real-world isolation timing metrics - all critical for bus interface design, level translation, and legacy system upgrades.
Technical Context
The SN74ABTH245DWR implements a dual-directional 8-bit transceiver architecture controlled by DIR (direction) and OE (output enable) inputs. Its EPIC-II™B BiCMOS process enables low power dissipation while sustaining high current drive and robust latch-up immunity (>500 mA per JESD17).
Power-up 3-state and Ioff circuitry ensure safe hot insertion: outputs enter high-impedance state when VCC is below 2.1 V, and back-current flow is blocked during power-down. Bus-hold inputs maintain valid logic levels on floating A/B data lines without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5-V TTL/CMOS logic rails and ensures stable operation across industrial voltage tolerances. |
| IOH / IOL | –32 mA / 64 mA - drives heavy capacitive loads and long traces without signal degradation; supports fan-out to multiple downstream receivers. |
| tPLH / tPHL | 0.8 ns to 3.9 ns - sub-4 ns propagation delay enables high-speed bus arbitration in real-time control and data acquisition systems. |
| Bus-Hold Current | ±100 µA at VI = 0.8 V or 2 V - actively holds unused inputs at valid logic thresholds, preventing metastability in partially populated bus interfaces. |
| Ioff | ±100 µA at VCC = 0 - blocks damaging backflow current during hot-plug events, protecting upstream drivers and enabling live module replacement. |
| θJA (DW package) | 58 °C/W - thermal performance validated for SOIC-20 footprint; supports continuous operation at full drive under natural convection in compact enclosures. |
| Operating Temp | –40°C to +85°C - qualified for industrial temperature range, suitable for factory automation, test equipment, and telecom infrastructure. |
Pinout & Package
SN74ABTH245DWR is housed in a 20-pin SOIC (DW) package measuring 12.8 mm × 7.5 mm × 2.65 mm (max height), RoHS-compliant with NiPdAu lead finish and moisture sensitivity level (MSL) 1 (260°C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | Determines data flow direction: logic low → B-to-A; logic high → A-to-B; must be driven to avoid undefined bus state. |
| 2–9 (A1–A8) | Port A Data Inputs/Outputs | Bidirectional I/O pins connected to one bus segment; feature integrated bus-hold for floating-input resilience. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output drivers; requires low-impedance PCB connection to minimize ground bounce. |
| 11 (VCC) | Power Supply | 5-V supply input; decoupling capacitor (0.1 µF ceramic) required within 10 mm of pin to suppress switching noise. |
| 12–19 (B1–B8) | Port B Data Inputs/Outputs | Bidirectional I/O pins connected to second bus segment; electrically identical to A-port with same bus-hold and drive strength. |
| 20 (OE) | Output Enable Input | Active-low control: logic low enables transceiver; logic high forces all A/B outputs into high-impedance isolation state. |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-II™B BiCMOS Process | Reduces dynamic power vs. standard bipolar TTL while retaining high noise immunity and rail-to-rail output swing. |
| Hot-Insertion Support | Ioff and power-up 3-state circuits eliminate need for sequencing controllers during live board replacement in modular systems. |
| Bus-Hold Inputs | Eliminates external pullup/pulldown resistors on A/B ports - reduces BOM count, PCB area, and layout complexity for unterminated buses. |
| High-Drive Outputs | –32 mA source / 64 mA sink capability drives 50-pF loads with <4 ns delay - meets timing margins for 25+ MHz bus clocking. |
| Output Ground Bounce (VOLP) | <1 V typical at VCC = 5 V, TA = 25°C - minimizes simultaneous switching noise that could corrupt adjacent signal integrity. |
Applications
| Industrial PLC Backplane Interface | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Interfacing microcontroller-based I/O modules to a 5-V parallel backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing data flow between CPU and field I/O cards under DIR-controlled direction and OE-gated isolation. Use Value: Bus-hold prevents floating inputs during card insertion/removal; high-drive outputs overcome backplane capacitance up to 100 pF without repeaters. |
Use Scenario: Extending aging ISA or VMEbus peripherals using modern controller boards with mismatched drive strength or termination. IC Role / Device Role / Timing Role: Isolating and buffering address/data/control signals between legacy bus segments and new FPGA-based bridge logic. Use Value: Sub-4 ns propagation delay preserves setup/hold timing for 8-MHz ISA cycles; Ioff protects legacy drivers during hot-swap maintenance. |
| Test Equipment Signal Routing | Automated Test Fixture Control |
|
Use Scenario: Configurable signal routing matrix in automated test equipment where DUT interfaces require dynamic bus direction switching. IC Role / Device Role / Timing Role: Reconfigurable 8-bit data path element controlled via FPGA GPIOs driving DIR and OE for real-time path selection. Use Value: OE-controlled 3-state isolation enables glitch-free bus sharing among multiple instrument channels; VOLP <1 V ensures clean analog measurement windows. |
Use Scenario: Driving high-current solenoid banks and opto-isolated sensor inputs in production test fixtures with shared 5-V control bus. IC Role / Device Role / Timing Role: Robust bus interface IC translating low-power controller outputs to high-current actuator signals while isolating feedback paths. Use Value: 64-mA sink capability directly drives LED indicators and small relays; bus-hold maintains defined states during fixture reconfiguration pauses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | 3.3-V only operation (1.65–3.6 V); lower drive (–24/+24 mA); no bus-hold; no Ioff. | Suitable for mixed-voltage 3.3-V systems but lacks hot-swap safety and floating-input resilience required in industrial backplanes. | Select SN74LVC245A only if operating strictly at 3.3 V and external pull resistors or sequenced power are acceptable. |
| SN74AHCT245 | 5-V tolerant inputs; CMOS output stage; 8-mA drive (–8/+8 mA); no bus-hold; no Ioff; higher propagation delay (~7 ns). | Compatible with 5-V TTL logic but insufficient drive for heavy bus loads; unsuitable for hot-insertion or unterminated stubs. | Choose SN74AHCT245 only for low-speed, low-capacitance point-to-point links where cost is prioritized over robustness. |
Compared with SN74LVC245A and SN74AHCT245, the SN74ABTH245DWR uniquely combines 5-V operation, high drive, bus-hold, and Ioff - making it the only option among the three qualified for unbuffered industrial backplanes requiring live maintenance and noise resilience.
Availability
SN74ABTH245DWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy bus extension, automated test equipment, and production test fixtures requiring stable component supply across extended product lifecycles.
Supply support for SN74ABTH245DWR 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 industrial-grade reliability validation.
The SN74ABTH245DWR belongs to TI's ABT logic family, engineered specifically for high-noise industrial environments requiring robust bus interfacing, hot-swap capability, and guaranteed 5-V operation without derating.
FAQ
What is the maximum capacitive load the SN74ABTH245DWR can drive while maintaining specified timing?
The SN74ABTH245DWR is characterized for CL = 50 pF in its switching specifications, with tPLH/tPHL up to 3.9 ns at VCC = 5 V and TA = 25°C. While it can drive heavier loads (e.g., 100 pF), propagation delay increases nonlinearly - actual timing must be verified per layout and load in the target application. The SN74ABTH245DWR datasheet does not guarantee performance beyond 50 pF without derating.
Does the SN74ABTH245DWR support true 5-V TTL compatibility on both inputs and outputs?
Yes. The SN74ABTH245DWR accepts TTL-level inputs (VIH = 2 V min, VIL = 0.8 V max) and delivers TTL-compatible output voltages (VOH ≥ 2.0 V at –32 mA, VOL ≤ 0.55 V at 64 mA) across its full operating range (4.5 V–5.5 V). This ensures interoperability with legacy 5-V TTL, LSTTL, and standard CMOS logic families.
How does the bus-hold circuitry in the SN74ABTH245DWR behave during power-up?
Bus-hold remains inactive until VCC reaches ~2.1 V. Below that threshold, A/B inputs float freely. Once powered above 2.1 V, bus-hold engages automatically - no enable signal required - and maintains the last-valid logic state on each input with ±100 µA holding current. This prevents metastability during gradual power ramp-up.
Can the SN74ABTH245DWR be used in a unidirectional configuration only?
Yes. The SN74ABTH245DWR supports unidirectional use: tie DIR to a fixed logic level (e.g., VCC for A→B only) and control data flow exclusively via OE. In this mode, it functions as an 8-bit non-inverting buffer with 3-state output control - commonly applied in address latching or peripheral enable paths.
What is the recommended PCB layout practice for minimizing ground bounce on the SN74ABTH245DWR?
To minimize ground bounce (VOLP <1 V typical), place a 0.1 µF ceramic decoupling capacitor between VCC (pin 11) and GND (pin 10) with trace length <5 mm. Use a solid ground plane beneath the device, avoid splits under the SOIC-20 footprint, and route high-speed A/B signals away from sensitive analog traces. The SN74ABTH245DWR's low VOLP is only achievable with proper layout adherence.
SN74ABTH245DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABTH
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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-SOIC
SN74ABTH245DWR FAQ
1.How can I place an order for SN74ABTH245DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABTH245DWR 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 SN74ABTH245DWR reliable?
The price and inventory of SN74ABTH245DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABTH245DWR is usually 5 days.
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SN74ABTH245DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABTH245DWR 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 SN74ABTH245DWR?
For technical support, including SN74ABTH245DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABTH245DWR requirements.
6.How does Aetrix verify that SN74ABTH245DWR is sourced from the original manufacturer or authorized distributors?
All SN74ABTH245DWR 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 SN74ABTH245DWR meets industry standards.
7.What is the process for return or replacement of SN74ABTH245DWR?
All SN74ABTH245DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABTH245DWR, 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 SN74ABTH245DWR part is unused and in its original packaging.
Return procedure for SN74ABTH245DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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