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Texas Instruments SN74ABTH25245DWR
- Part No.:
- SN74ABTH25245DWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABTH25245DWR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,921
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Product details
Overview
SN74ABTH25245DWR from Texas Instruments is a 25-Ω octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in high-speed digital systems. It supports incident-wave switching on 25-Ω transmission lines, sinks up to 188 mA (A port) and 64 mA (B port), operates from –40°C to 85°C, and features bus-hold circuitry eliminating external pullup/pulldown resistors.
For engineers reviewing the SN74ABTH25245DWR datasheet, SN74ABTH25245DWR pinout, SN74ABTH25245DWR application, or SN74ABTH25245DWR equivalent, key selection criteria include 25-Ω line driving capability, dual-direction control via DIR/OE, SOIC-24 package compatibility, and bus-hold functionality for floating-input robustness.
Technical Context
This device implements a BiCMOS EPIC-IIB architecture enabling low-power, high-current drive while maintaining TTL-compatible logic thresholds (VIL = 0.8 V, VIH = 2.0 V). Its distributed VCC/GND pin layout minimizes simultaneous switching noise, and internal bus-hold circuitry actively maintains valid logic levels on unused A/B inputs without external components.
The transceiver supports two independent 3-state control paths: DIR selects direction (A→B or B→A), while OE enables/disables all outputs. When VCC is below 2.1 V, the device enters high-impedance state during power-up/down-ensuring clean isolation without external sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across industrial 5-V rail tolerances |
| A-port IOL | 188 mA - drives 25-Ω transmission lines at incident wave for minimal signal reflection |
| B-port IOL | 64 mA - supports lower-drive interconnects while maintaining timing integrity |
| Propagation Delay | 1 ns to 4.3 ns - enables sub-5-ns bidirectional data path timing in high-speed backplanes |
| Bus-Hold Current | ±100 µA - actively clamps floating inputs to valid logic without external resistors |
| ESD Protection | >2000 V HBM - meets MIL-STD-883 requirements for handling robustness |
| Operating Temperature | –40°C to +85°C - qualified for industrial ambient environments |
Pinout & Package
SN74ABTH25245DWR 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 located in Quadrant Q1 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Data inputs/outputs (A-side) | Octal bidirectional data terminals connected to A bus; internally bus-held when floating |
| B1–B8 | Data inputs/outputs (B-side) | Octal bidirectional data terminals connected to B bus; support 25-Ω line driving |
| DIR | Direction control input | High = A→B data flow; Low = B→A data flow; TTL-compatible threshold |
| OE | Output enable input | Low = device active; High = all outputs in high-impedance state; powers down cleanly |
| VCC | Power supply | Dual distributed pins (pins 11 and 20) reduce switching noise and improve PDN stability |
| GND | Ground reference | Four distributed GND pins (pins 2, 5, 7, 9) minimize ground bounce and EMI |
Key Features
| Feature | Design Value |
|---|---|
| 25-Ω line driving | Enables incident-wave switching on controlled-impedance PCB traces without termination resistors |
| Distributed VCC/GND | Reduces simultaneous switching noise by 30% vs. single-supply-pin alternatives |
| Integrated bus-hold | Eliminates need for 16 external pullup/pulldown resistors in typical bus interface designs |
| Power-up/down isolation | Guarantees high-Z state when VCC < 2.1 V - prevents bus contention during rail ramping |
| TTL-compatible I/O | Accepts standard 5-V TTL logic levels while driving heavy capacitive loads |
Applications
| Backplane Data Routing | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Bidirectional data exchange between CPU module and peripheral I/O cards across a 25-Ω parallel bus. IC Role / Device Role / Timing Role: Octal transceiver managing A↔B bus arbitration with DIR-controlled direction and OE-gated isolation. Use Value: 188-mA A-port sink current ensures full-swing signal integrity over 15-cm backplane traces without added termination. | Use Scenario: Interfacing microcontroller GPIO banks to isolated digital input/output modules in factory automation cabinets. IC Role / Device Role / Timing Role: Level-shifting and bus-isolation transceiver with bus-hold preventing spurious transitions on unterminated field wiring. Use Value: Built-in bus-hold eliminates 16 external resistors per device, reducing BOM count and board space in dense I/O stacks. |
| Test Equipment Bus Interface | Legacy System Protocol Bridge |
Use Scenario: Connecting FPGA-based pattern generators to DUT test fixtures with long, unterminated ribbon cables. IC Role / Device Role / Timing Role: High-current driver enabling incident-wave launch into 25-Ω cabling to minimize reflections and timing skew. Use Value: Sub-5-ns propagation delay and 64-mA B-port drive maintain <1 ns channel-to-channel skew across all eight lanes. | Use Scenario: Adapting legacy 8-bit ISA-style address/data buses to modern controller interfaces in retro-computing hardware. IC Role / Device Role / Timing Role: Bidirectional bus buffer providing direction control and output disable for shared memory-mapped peripherals. Use Value: OE-controlled high-Z state allows seamless bus sharing between multiple masters without external arbitration logic. |
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; 24-mA drive; no bus-hold; different pinout | Suitable for low-voltage mixed-signal systems but cannot replace SN74ABTH25245DWR in 5-V, high-drive, or floating-input scenarios | Select only if system uses 3.3-V rails and external pullups are acceptable |
| SN74ABT245 | Same 5-V operation and 25-Ω drive, but lacks bus-hold and has higher ICC (20 mA vs. 500 µA disabled) | Requires external pullup/pulldown resistors and exhibits higher static power in disabled state | Use where bus-hold is unnecessary and cost-per-unit is prioritized over design simplification |
Compared with SN74LVC245A and SN74ABT245, SN74ABTH25245DWR uniquely combines 5-V tolerance, 188-mA drive, integrated bus-hold, and power-rail-safe high-Z behavior-making it irreplaceable in industrial backplane and legacy-bus interface designs requiring zero external bias components.
Availability
SN74ABTH25245DWR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, test equipment bus interface, and legacy system protocol bridge applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for SN74ABTH25245DWR 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ABTH25245DWR belongs to TI's ABTH-series advanced bi-directional transceivers, engineered specifically for high-speed, high-drive 5-V bus interfacing in noise-sensitive industrial and instrumentation systems.
FAQ
What is the maximum output current capability of SN74ABTH25245DWR on the A port?
The SN74ABTH25245DWR supports up to 188 mA of low-level output current (IOL) on the A port at VCC = 4.5 V. This high sink capability enables direct driving of 25-Ω transmission lines for incident-wave switching, reducing signal reflections and improving timing margins in backplane and cable-based interfaces. The A port's 188-mA rating is confirmed in the recommended operating conditions table of the official SCBS251F datasheet.
Does SN74ABTH25245DWR require external pullup or pulldown resistors on its data inputs?
No, SN74ABTH25245DWR does not require external pullup or pulldown resistors due to its integrated bus-hold circuitry. Each A and B port input maintains a valid logic level when floating, with ±100 µA hold current specified at VCC = 4.5 V. This feature eliminates 16 discrete resistors in typical octal bus designs, reducing BOM cost and PCB area-confirmed in the device description and electrical characteristics sections of the SCBS251F datasheet.
What is the operating temperature range for SN74ABTH25245DWR?
SN74ABTH25245DWR is characterized for operation from –40°C to +85°C, meeting industrial-grade environmental requirements. This range is explicitly defined in the "recommended operating conditions" table of the SCBS251F datasheet and distinguishes it from the military-grade SN54ABTH25245 (–55°C to +125°C). The part marking "ABTH25245" and packaging data confirm its SN74 (industrial) variant status.
How does SN74ABTH25245DWR behave during power-up and power-down sequences?
During power-up or power-down, SN74ABTH25245DWR automatically enters a high-impedance state when VCC is between 0 V and 2.1 V-preventing bus contention before supply stabilization. To ensure high-Z above 2.1 V, OE must be tied to VCC via a pullup resistor. This behavior is guaranteed per the functional description and absolute maximum ratings section of the SCBS251F datasheet and applies specifically to the SN74ABTH25245DWR DW-package variant.
What package type and pin count does SN74ABTH25245DWR use?
SN74ABTH25245DWR uses a 24-pin SOIC (DW) package with gull-wing leads, 1.27 mm pitch, and JEDEC MS-013 outline. Its dimensions are 7.5 mm × 15.4 mm, and it ships in large tape-and-reel format (2000 units/reel) with Q1 pin-1 quadrant orientation. This package information is verified in TI's official Package Option Addendum and matches the "DW" suffix in the part number and top-marking "ABTH25245".
SN74ABTH25245DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABTH
- Package/Case:
- 24-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:
- 80mA, 188mA; 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74ABTH25245DWR FAQ
1.How can I place an order for SN74ABTH25245DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABTH25245DWR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74ABTH25245DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABTH25245DWR is usually 5 days.
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5.How can I obtain technical support or documentation for SN74ABTH25245DWR?
For technical support, including SN74ABTH25245DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABTH25245DWR requirements.
6.How does Aetrix verify that SN74ABTH25245DWR is sourced from the original manufacturer or authorized distributors?
All SN74ABTH25245DWR 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 SN74ABTH25245DWR meets industry standards.
7.What is the process for return or replacement of SN74ABTH25245DWR?
All SN74ABTH25245DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABTH25245DWR, 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 SN74ABTH25245DWR part is unused and in its original packaging.
Return procedure for SN74ABTH25245DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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