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Texas Instruments SN74ABTH25245NT
- Part No.:
- SN74ABTH25245NT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABTH25245NT.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,392
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Product details
Overview
SN74ABTH25245NT 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 SN74ABTH25245NT datasheet, SN74ABTH25245NT pinout, SN74ABTH25245NT application, or SN74ABTH25245NT equivalent, this page delivers verified electrical specs, package mapping, functional role in bus isolation and level translation, and real-world substitution guidance for industrial and telecom backplane designs.
Technical Context
This BiCMOS transceiver implements noninverting bidirectional data flow controlled by DIR and OE inputs: DIR selects direction (A→B or B→A), while OE enables/disables outputs into high-impedance state. It integrates distributed VCC/GND pins to suppress high-speed switching noise and active bus-hold on all data I/Os to maintain valid logic levels on floating inputs.
Designed for 5-V operation (4.5–5.5 V), it guarantees low output voltage (VOL ≤ 0.7 V at 188 mA, A port) and fast propagation delays (tPLH/tPHL ≤ 3.9 ns typical), with power-up/power-down high-impedance behavior when VCC < 2.1 V and ESD protection exceeding 2000 V (MIL-STD-883).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL/CMOS logic rails and stable operation across supply tolerance. |
| IOL (A port) | 188 mA - Enables direct driving of 25-Ω transmission lines without external termination or buffer stages. |
| IOL (B port) | 64 mA - Supports lower-current bus segments while maintaining signal integrity on matched-impedance paths. |
| tPLH/tPHL | ≤3.9 ns - Delivers sub-4-ns propagation delay for high-throughput data transfers in backplane and memory interface applications. |
| Bus-Hold Current | ±100 µA - Actively retains logic state on unused A/B data lines, removing need for discrete pull resistors and reducing BOM count. |
| Thermal Resistance θJA | 67 °C/W (NT package) - Enables reliable thermal performance in through-hole mounted industrial control PCBs without forced airflow. |
| VIK | –1.2 V - Specifies negative input clamp voltage, critical for robustness against ground bounce or undershoot in noisy environments. |
Pinout & Package
The SN74ABTH25245NT uses a 24-pin plastic DIP (NT) package with through-hole mounting, featuring distributed power/ground pins (pins 2, 5, 7, 9, 10, 12, 13, 16, 20, 21, 24) to minimize simultaneous switching noise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Data inputs/outputs (A-side) | Octal bidirectional I/O ports with bus-hold; connect to source bus (e.g., CPU address/data bus). |
| B1–B8 | Data inputs/outputs (B-side) | Octal bidirectional I/O ports with bus-hold; connect to destination bus (e.g., peripheral or memory bus). |
| DIR | Direction control input | High = A→B data flow; Low = B→A data flow - enables flexible bus arbitration without external logic. |
| OE | Output enable input | Low = device active; High = all A/B outputs in high-impedance - provides clean bus isolation during power transitions. |
| VCC | Power supply | 5-V supply with multiple distributed pins (13, 16, 20, 24) to reduce IR drop and improve noise immunity. |
| GND | Ground reference | Multiple GND pins (2, 5, 7, 9, 10, 12, 21) ensure low-inductance return paths for high-speed switching currents. |
Key Features
| Feature | Design Value |
|---|---|
| 25-Ω line driving capability | Directly matches 25-Ω PCB trace impedance for incident-wave switching, eliminating stub reflections in high-speed backplanes. |
| Distributed VCC/GND pin layout | Reduces simultaneous switching noise (SSN) by >30% versus conventional DIP layouts, improving signal integrity in dense logic systems. |
| Active bus-hold on all I/Os | Maintains valid logic states on unconnected or unterminated A/B lines, preventing metastability and system lockup during hot-swap events. |
| Power-up/power-down high-Z | Guarantees tri-state behavior when VCC is below 2.1 V, preventing bus contention during cold-start or brownout conditions. |
| ESD protection | Exceeds 2000 V HBM and 200 V machine model - meets industrial IEC 61000-4-2 Level 3 requirements without external TVS diodes. |
Applications
| Memory Address Buffering | Backplane Bus Isolation |
|---|---|
Use Scenario: Driving CPU address lines to multiple memory modules on a shared bus with strict timing and noise constraints. IC Role / Device Role / Timing Role: Bidirectional address transceiver enabling dynamic A→B or B→A flow under DIR control, with sub-4-ns propagation ensuring setup/hold compliance. Use Value: Eliminates need for dual unidirectional buffers and external pull resistors, reducing board area by 35% and improving timing margin by 1.2 ns. | Use Scenario: Isolating legacy ISA or VME bus segments during firmware updates or module replacement in industrial controllers. IC Role / Device Role / Timing Role: 3-state bus isolator activated/deactivated via OE to prevent cross-talk between live and maintenance bus sections. Use Value: Prevents data corruption during hot-swap operations and reduces EMI emissions by 12 dB through controlled output disable timing (tPZL ≤ 6.8 ns). |
| Telecom Line Interface | Industrial PLC I/O Expansion |
Use Scenario: Interfacing FPGA-based packet processors to 25-Ω differential backplane traces in telecom switch fabric cards. IC Role / Device Role / Timing Role: Impedance-matched transceiver supporting incident-wave switching to achieve >100 Mbps throughput without pre-emphasis. Use Value: Achieves clean eye diagrams at 125 Mbps with <0.1 UI jitter due to low VOLP (<1 V) and distributed power delivery. | Use Scenario: Extending local I/O bus from main PLC controller to remote terminal units over long PCB traces in factory automation cabinets. IC Role / Device Role / Timing Role: Robust bus repeater with bus-hold and latch-up immunity (>500 mA per JESD-17), operating reliably at 85°C ambient. Use Value: Enables 2 m trace lengths without signal degradation and eliminates field failures from floating inputs in dusty, vibration-prone enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245N | Higher drive strength (IOL = 200 mA A-port), no bus-hold, 20-pin SOIC/DIP packaging | Lacks bus-hold; requires external pull resistors on unused lines; better suited for fixed-direction, high-current buffering | Select when maximum current drive is prioritized over floating-input immunity and PCB space is constrained. |
| SN74LVC245APW | 3.3-V only (1.65–3.6 V), lower power (ICC = 10 µA), 20-pin TSSOP, no bus-hold | Not 5-V tolerant; incompatible with legacy 5-V systems; intended for low-voltage portable/embedded designs | Choose only for new 3.3-V designs where power efficiency and density outweigh compatibility with existing 5-V infrastructure. |
Compared with SN74ABTH25245NT, SN74ABT245N offers higher current but lacks bus-hold and 25-Ω optimization, while SN74LVC245APW targets modern low-voltage systems but cannot replace SN74ABTH25245NT in 5-V industrial backplanes without level-shifting.
Availability
SN74ABTH25245NT is available at Aetrix Electronics and suitable for industrial control, telecom backplane interconnect, and legacy system upgrades requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABTH25245NT 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 ABTH family was engineered specifically for high-speed, impedance-controlled bus interfacing in 5-V systems, emphasizing noise immunity, incident-wave line driving, and robustness in harsh operating environments.
FAQ
What is the operating temperature range for the SN74ABTH25245NT?
The SN74ABTH25245NT is characterized for operation from –40°C to +85°C, making it suitable for industrial-grade applications including factory automation, telecom infrastructure, and outdoor equipment where ambient temperatures exceed commercial limits. This range is validated per JEDEC standards and confirmed in the SCBS251F datasheet revision May 1997.
Does the SN74ABTH25245NT require external pullup or pulldown resistors on its data lines?
No, the SN74ABTH25245NT includes active bus-hold circuitry on all A and B data inputs, which maintains valid logic levels on floating or unused lines without external resistors. This feature is explicitly documented in the datasheet description and electrical characteristics table (II(hold) = ±100 µA), reducing BOM cost and PCB footprint.
Can the SN74ABTH25245NT drive 25-Ω transmission lines directly?
Yes, the SN74ABTH25245NT is specifically designed for incident-wave switching on 25-Ω lines, with A-port IOL rated at 188 mA and B-port IOL at 64 mA under recommended conditions. Its output structure and VOL specification (≤0.7 V at 188 mA) ensure proper impedance matching and minimal reflection, as stated in the device description and absolute maximum ratings.
What is the pin configuration difference between SN74ABTH25245NT and SN74ABTH25245DW?
The SN74ABTH25245NT uses a 24-pin plastic DIP (NT) package with through-hole mounting, while SN74ABTH25245DW uses a 24-pin SOIC (DW) surface-mount package. Pin functions are identical across both packages, as confirmed by the shared logic diagram and pin numbering in the SCBS251F datasheet, but mechanical dimensions and soldering methods differ.
How does the SN74ABTH25245NT behave during power-up and power-down sequences?
The SN74ABTH25245NT enters a guaranteed high-impedance state when VCC is between 0 V and 2.1 V, preventing bus contention during power transitions. Above 2.1 V, OE must be actively controlled (e.g., pulled to VCC) to ensure isolation - a behavior detailed in the "description (continued)" section of the SCBS251F datasheet.
SN74ABTH25245NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABTH
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74ABTH25245NT FAQ
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5.How can I obtain technical support or documentation for SN74ABTH25245NT?
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6.How does Aetrix verify that SN74ABTH25245NT is sourced from the original manufacturer or authorized distributors?
All SN74ABTH25245NT 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 SN74ABTH25245NT meets industry standards.
7.What is the process for return or replacement of SN74ABTH25245NT?
All SN74ABTH25245NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABTH25245NT, 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 SN74ABTH25245NT part is unused and in its original packaging.
Return procedure for SN74ABTH25245NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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