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Texas Instruments SN74ABTH245DW
- Part No.:
- SN74ABTH245DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABTH245DW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:282
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Product details
Overview
SN74ABTH245DW 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 ±32-mA high-drive outputs, bus-hold circuitry eliminating external pull resistors, Ioff support for hot insertion, and operates over –40°C to 85°C at 4.5–5.5 V supply. Used in backplane interface, memory expansion, and system-level bus isolation.
For engineers reviewing the SN74ABTH245DW datasheet, SN74ABTH245DW pinout, SN74ABTH245DW application, or SN74ABTH245DW equivalent, key selection criteria include its 20-pin SOIC (DW) package, direction-controlled bidirectional flow, power-up 3-state behavior, and compatibility with 5-V TTL/CMOS logic families in space-constrained board designs.
Technical Context
This device implements a dual-rail 8-bit bidirectional bus interface with independent DIR (direction) and OE (output enable) control inputs. Its EPIC-IIB BiCMOS process enables low power dissipation while delivering high current drive (–32 mA IOH / 64 mA IOL) and sub-1-V output ground bounce (VOLP).
The integrated bus-hold circuit maintains valid logic levels on floating A/B inputs without external components, and the Ioff specification ensures <±100 µA leakage when VCC = 0 V-critical for live-insertion systems where backdrive must be prevented during power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V logic rails and tolerant of typical power rail variation. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade environmental operation without derating. |
| Output Drive | –32 mA IOH / +64 mA IOL - sufficient to drive heavy capacitive loads and multiple TTL inputs without buffering. |
| Propagation Delay | 0.8 ns to 3.9 ns (tPLH/tPHL) - supports high-speed bus timing in systems up to ~250 MHz effective data rate. |
| Bus-Hold Current | ±100 µA at VI = 0.8 V or 2.0 V - actively sustains input logic state without external biasing components. |
| Thermal Resistance θJA | 58°C/W (SOIC DW) - enables thermal management in moderate-power-density PCB layouts without forced airflow. |
| Ioff Leakage | ±100 µA at VCC = 0 V - prevents damaging back-current during hot-swap or partial-power-down scenarios. |
Pinout & Package
SN74ABTH245DW is housed in a 20-pin SOIC (DW) package measuring 7.5 mm × 12.8 mm × 2.65 mm (max height), with 1.27-mm lead pitch and gull-wing leads. The package is RoHS-compliant, NIPDAU-plated, and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIR) | Direction Control Input | Determines data flow direction: LOW = B→A, HIGH = A→B; referenced to VCC/GND, not bus voltage. |
| 2–9 (A1–A8) | Port A Data Inputs/Outputs | Bidirectional I/O pins with bus-hold; function as inputs or outputs depending on DIR and OE state. |
| 10 (GND) | Ground Reference | Primary signal return path; must be low-impedance connection to minimize noise coupling and ground bounce. |
| 11 (VCC) | Power Supply | 5-V supply input; requires local 0.1-µF ceramic decoupling capacitor placed within 5 mm of this pin. |
| 12–19 (B1–B8) | Port B Data Inputs/Outputs | Complementary bidirectional I/O port; electrically identical to A-side with independent bus-hold. |
| 20 (OE) | Output Enable Input | Active-LOW control: LOW enables transceiver, HIGH places both A and B ports in high-impedance state. |
Key Features
| Feature | Design Value |
|---|---|
| Hot-Insertion Support | Guaranteed via Ioff (±100 µA max at VCC = 0 V) and power-up 3-state, preventing backdrive damage during live board replacement. |
| Bus-Hold Circuitry | Eliminates need for external pullup/pulldown resistors on all 16 data lines-reducing BOM count and layout area by up to 32 passives. |
| High-Drive Outputs | –32 mA source / +64 mA sink capability drives 2–3 standard TTL loads or >10 CMOS inputs directly, reducing interposer buffer requirements. |
| Low Ground Bounce | VOLP < 1 V at VCC = 5 V, TA = 25°C - minimizes switching noise coupling into adjacent signals and analog sections. |
| EPIC-IIB BiCMOS Process | Combines bipolar speed and CMOS low static power-achieving 3.2 ns typical propagation delay with ICC < 30 mA under full load. |
Applications
| Industrial Backplane Interface | Memory Expansion Subsystem |
|---|---|
|
Use Scenario: Isolating CPU address/data bus from peripheral expansion slots in programmable logic controllers (PLCs) with hot-swap capability. IC Role / Device Role / Timing Role: Bidirectional level-shifting and bus isolation transceiver enabling safe insertion/removal of I/O modules without system reset. Use Value: Ioff and power-up 3-state prevent backfeed into powered CPU bus; bus-hold maintains slot configuration integrity during module absence. |
Use Scenario: Connecting microcontroller parallel bus to external SRAM or flash memory in medical imaging subsystems requiring deterministic access timing. IC Role / Device Role / Timing Role: Direction-controlled data path extension with minimal propagation delay (<3.9 ns) and robust drive strength for 100+ pF trace loads. Use Value: High sink/source current ensures clean signal edges across long traces; low VOLP preserves noise margin in mixed-signal environments. |
| Automotive Diagnostic Gateway | Test Equipment Bus Arbitration |
|
Use Scenario: Interfacing CAN controller's parallel host interface to diagnostic ECU's internal data bus in OBD-II compliant tools operating across extended temperature range. IC Role / Device Role / Timing Role: Temperature-hardened (–40°C to +85°C) bidirectional bus bridge supporting intermittent communication handshaking protocols. Use Value: Guaranteed operation at automotive ambient extremes; bus-hold prevents floating inputs during protocol idle states, avoiding spurious interrupts. |
Use Scenario: Enabling shared JTAG or IEEE 1149.1 boundary-scan test access across multiple FPGA or ASIC devices on a single test fixture PCB. IC Role / Device Role / Timing Role: Controlled-enabling of test data path between master controller and DUTs using synchronized OE assertion. Use Value: Precise tPZL/tPHZ timing (1.3–2.2 ns) ensures glitch-free test vector delivery; 3-state isolation prevents contention during scan chain reconfiguration. |
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 (1.65–3.6 V), lower drive (–24/+24 mA), no bus-hold, no Ioff. | Suitable for low-voltage digital systems but lacks hot-swap protection and floating-input immunity. | Select SN74LVC245A only if operating strictly at 3.3 V and external pull resistors or active termination are acceptable. |
| SN74AHCT245 | 5-V only (4.5–5.5 V), TTL-compatible inputs, no bus-hold, no Ioff, higher ICC (up to 40 mA). | Compatible with legacy TTL logic but requires external biasing and cannot be hot-inserted safely. | Choose SN74AHCT245 when interfacing with older TTL peripherals and thermal budget allows higher quiescent current. |
Compared with SN74LVC245A and SN74AHCT245, the SN74ABTH245DW uniquely combines 5-V operation, integrated bus-hold, Ioff-enabled hot insertion, and high-current drive-making it the only option among the three qualified for industrial backplane and live-replaceable module designs.
Availability
SN74ABTH245DW is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion subsystems, automotive diagnostic gateways, and test equipment bus arbitration requiring stable component supply and long-term manufacturability.
Supply support for SN74ABTH245DW 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 and automotive-grade interface ICs.
The ABTH logic family was engineered specifically for high-reliability, high-drive bidirectional bus interfacing in harsh environments-emphasizing hot-swap safety, noise immunity, and wide-temperature operation.
FAQ
What is the maximum clock/data rate supported by SN74ABTH245DW?
The SN74ABTH245DW does not operate on a clock; it is an asynchronous transceiver. Its 0.8–3.9 ns propagation delay supports reliable data transfer in systems with bus cycle times ≥8 ns-equivalent to sustained throughput up to ~125 MB/s on an 8-bit parallel bus with proper setup/hold timing margins.
Can SN74ABTH245DW be used with 3.3-V logic systems?
No. The SN74ABTH245DW is specified only for 4.5–5.5 V operation and has TTL-compatible input thresholds (VIH = 2.0 V min). Driving its inputs from 3.3-V CMOS may result in marginal or non-functional high-level recognition; level translation is required for interoperability.
How does the bus-hold feature behave when an input floats during operation?
When any A or B input floats, the internal bus-hold circuit sources or sinks ±100 µA to maintain the last-valid logic state. This prevents metastability and unintended toggling-eliminating the need for external 10–50 kΩ pull resistors on all 16 data lines in the SN74ABTH245DW design.
Is SN74ABTH245DW pin-compatible with other 20-pin octal transceivers like SN74LS245?
Yes, SN74ABTH245DW shares identical 20-pin SOIC (DW) pinout and functional mapping with SN74LS245 and SN74ALS245-including DIR, OE, A1–A8, B1–B8, VCC, and GND placements-but offers superior drive strength, bus-hold, and hot-swap capability not present in LS/ALS variants.
What is the recommended decoupling for SN74ABTH245DW?
A minimum of one 0.1-µF X7R ceramic capacitor placed within 5 mm of the VCC pin (Pin 11) and connected directly to the GND pin (Pin 10) is required. For systems with >10 transceivers or high di/dt loads, add a 4.7-µF tantalum or polymer capacitor per 5 devices near the power entry point.
SN74ABTH245DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABTH
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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
SN74ABTH245DW FAQ
1.How can I place an order for SN74ABTH245DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABTH245DW 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 SN74ABTH245DW reliable?
The price and inventory of SN74ABTH245DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABTH245DW is usually 5 days.
3.What payment methods are accepted for SN74ABTH245DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABTH245DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABTH245DW?
SN74ABTH245DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABTH245DW 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 SN74ABTH245DW?
For technical support, including SN74ABTH245DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABTH245DW requirements.
6.How does Aetrix verify that SN74ABTH245DW is sourced from the original manufacturer or authorized distributors?
All SN74ABTH245DW 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 SN74ABTH245DW meets industry standards.
7.What is the process for return or replacement of SN74ABTH245DW?
All SN74ABTH245DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABTH245DW, 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 SN74ABTH245DW part is unused and in its original packaging.
Return procedure for SN74ABTH245DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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