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Texas Instruments SN74BCT25244NT
- Part No.:
- SN74BCT25244NT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74BCT25244NT.pdf
- Description:
- IC BUF NON-INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,788
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Product details
Overview
SN74BCT25244NT from Texas Instruments is a 25-Ω octal buffer/driver IC with 3-state outputs, designed for incident-wave switching on 25-Ω transmission lines in memory address and clock distribution systems. It sinks up to 188 mA per output (IOL), operates at 4.5–5.5 V, and is rated for 0°C to 70°C. Used in high-density bus transceivers requiring low-noise, high-drive capability.
For engineers reviewing the SN74BCT25244NT datasheet, SN74BCT25244NT pinout, SN74BCT25244NT application, or SN74BCT25244NT equivalent, key selection criteria include 25-Ω line driving capability, 3-state control timing (tPZL ≤ 9.5 ns), distributed power/ground pin layout, and SOIC-24 (NT) package compatibility with legacy DIP footprints.
Technical Context
This BiCMOS buffer implements dual 4-bit noninverting drivers with independent 3-state enable controls (1OE, 2OE). Each of the eight outputs drives 25-Ω transmission lines using incident-wave switching-enabled by low-output-impedance design and 188-mA sink current capability.
Distributed VCC and GND pins across the 24-pin SOIC (NT) package suppress simultaneous switching noise. The device supports TTL-compatible inputs and produces CMOS-level outputs, with propagation delays as low as 1 ns (tPLH) and 3-state transition times under 10 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL/CMOS logic rails and stable operation across supply tolerance. |
| Output Sink Current (IOL) | 188 mA - enables direct incident-wave switching of 25-Ω transmission lines without external termination or driver stages. |
| Propagation Delay (tPLH) | 1 ns min / 5.5 ns max - supports high-speed address and clock distribution in dense memory subsystems. |
| 3-State Enable Time (tPZL) | 3.1 ns min / 9.5 ns max - guarantees fast bus release for time-critical multiplexed data paths. |
| Input Clamp Current | –18 mA - provides robust ESD protection exceeding 2000 V (MIL-STD-883C) and 200 V (machine model). |
| Quiescent ICCZ | 7–11 mA - significantly reduced vs. older bipolar designs, lowering system standby power and thermal load. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control applications with ambient thermal constraints. |
Pinout & Package
The SN74BCT25244NT is supplied in a 24-pin plastic DIP (NT) package with 0.600-inch body width and through-hole mounting. Pin spacing is 0.100 inch; lead finish is tin-lead (SnPb).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 6, 7, 9, 10 | 1Y1–1Y4, 2Y1–2Y4 outputs | Active-low 3-state outputs; each capable of sinking 188 mA into 25-Ω loads for incident-wave line driving. |
| 13, 14, 15, 17, 18, 20, 22, 23 | 1A1–1A4, 2A1–2A4 inputs | TTL-compatible inputs accepting 0.8 V (VIL) / 2.0 V (VIH); drive internal BiCMOS buffers directly. |
| 5, 12, 16, 21, 24 | GND | Five dedicated ground terminals minimize ground bounce during simultaneous output switching. |
| 8, 19 | VCC | Two distributed 5-V supply pins reduce power rail inductance and improve noise immunity. |
| 11, 24 | 1OE, 2OE | Independent active-low output-enable controls; assert low to enable corresponding 4-bit channel. |
Key Features
| Feature | Design Value |
|---|---|
| 25-Ω line driving capability | Enables direct incident-wave switching on controlled-impedance PCB traces without series termination resistors. |
| Distributed VCC/GND pins | Five GND and two VCC pins suppress simultaneous switching noise, improving signal integrity in high-speed buses. |
| BiCMOS process technology | Combines bipolar speed and CMOS low ICCZ, reducing quiescent current to 7–11 mA versus >50 mA in legacy bipolar equivalents. |
| ESD protection | Exceeds 2000 V HBM and 200 V machine model-meets MIL-STD-883C requirements for rugged industrial environments. |
| SOIC/DIP footprint compatibility | NT package maintains 0.600-inch DIP outline and pinout, enabling drop-in replacement in legacy through-hole designs. |
Applications
| Memory Address Drivers | Clock Distribution Networks |
|---|---|
Use Scenario: Driving parallel address buses in SRAM, DRAM, or Flash memory subsystems where trace impedance is matched to 25 Ω. IC Role / Device Role / Timing Role: Noninverting octal buffer providing low-skew, high-current address signal amplification with 3-state isolation between memory banks. Use Value: Eliminates need for external series termination; 188-mA sink current ensures full logic swing on incident wave, reducing setup/hold timing margin loss. | Use Scenario: Distributing system clock signals to multiple synchronous peripherals (e.g., ADCs, FPGAs, microcontrollers) over controlled-impedance PCB traces. IC Role / Device Role / Timing Role: Low-jitter, high-drive clock fanout buffer with independent enable controls for dynamic clock gating. Use Value: Propagation delay variation <0.5 ns across channels minimizes skew; distributed power pins prevent clock edge degradation due to simultaneous switching noise. |
| Bus Transceivers | Industrial Control Backplanes |
Use Scenario: Bidirectional data bus interfacing between microcontroller and peripheral ASICs in compact embedded systems. IC Role / Device Role / Timing Role: Dual 4-bit 3-state buffer enabling direction-controlled data flow with fast output disable (tPZL ≤ 9.5 ns). Use Value: Enables glitch-free bus arbitration; 25-Ω drive strength matches backplane trace impedance, suppressing reflections and ringing. | Use Scenario: Signal conditioning and level translation in modular PLC I/O modules with long, unterminated wiring harnesses. IC Role / Device Role / Timing Role: Robust address/data driver tolerant of EMI and voltage transients in factory-floor environments. Use Value: MIL-STD-883C–qualified ESD protection and 0°C–70°C rating ensure reliable operation despite electrical noise and thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F25244N | Lower IOL (100 mA), higher ICCZ (>30 mA), no distributed GND/VCC pins | Limited to lower-speed or higher-impedance (>50 Ω) lines; greater ground bounce risk in dense layouts | Choose only if cost sensitivity outweighs performance and noise requirements. |
| SN74ACT25244N | CMOS process, 24-mA IOL, 5-V tolerant inputs, wider VCC range (4.5–5.5 V) | Insufficient drive for 25-Ω incident-wave switching; suited for general-purpose buffering, not line driving | Select when low power and input voltage flexibility are prioritized over transmission-line drive capability. |
Compared with SN74F25244N and SN74ACT25244N, the SN74BCT25244NT uniquely delivers 188-mA sink current with distributed power/ground architecture-making it the only option among the three qualified for reliable 25-Ω incident-wave line driving in high-density memory and clock systems.
Availability
SN74BCT25244NT is available at Aetrix Electronics and suitable for memory address drivers, clock distribution networks, and industrial backplane interfaces requiring stable component supply, long-term obsolescence management, and legacy through-hole compatibility.
Supply support for SN74BCT25244NT 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 SN74BCT25244NT belongs to TI's BCT (Bipolar-CMOS Transistor) logic family-designed specifically for high-speed, high-drive, low-noise bus interface and memory address applications in commercial-grade systems.
FAQ
What is the maximum output sink current specification for SN74BCT25244NT?
The SN74BCT25244NT is specified to sink up to 188 mA per output (IOL) under recommended operating conditions (VCC = 4.5 V, TA = 25°C). This high drive strength enables incident-wave switching on 25-Ω transmission lines without external termination, making the SN74BCT25244NT especially effective in memory address and clock distribution applications where signal integrity is critical.
Does SN74BCT25244NT support 3.3-V input logic levels?
No, the SN74BCT25244NT has TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) and requires a 4.5–5.5-V supply. It does not guarantee recognition of 3.3-V logic-high signals. For mixed-voltage systems, level-shifting circuitry or a 3.3-V–tolerant alternative like SN74LVC25244 should be used instead of relying on the SN74BCT25244NT for direct 3.3-V interface.
What package type is used for SN74BCT25244NT?
The SN74BCT25244NT uses a 24-pin plastic dual in-line package (PDIP) with 0.600-inch body width and through-hole mounting. Its pinout and mechanical dimensions match industry-standard NT package specifications, allowing direct replacement in legacy DIP-based designs without PCB modification.
How does SN74BCT25244NT reduce switching noise compared to standard octal buffers?
The SN74BCT25244NT reduces switching noise via five dedicated GND pins and two distributed VCC pins-physically separating power and ground return paths to minimize shared-impedance coupling. This architecture lowers ground bounce and supply droop during simultaneous output transitions, a key advantage over single-VCC/single-GND octal buffers like the SN74LS244. The result is improved signal fidelity in the SN74BCT25244NT's target applications: high-speed memory and clock buses.
Is SN74BCT25244NT suitable for automotive applications?
No, the SN74BCT25244NT is characterized for 0°C to 70°C operation and is designated for commercial-grade use. It lacks AEC-Q100 qualification, extended temperature range (–40°C to 125°C), or automotive-specific reliability testing. For automotive applications, engineers should select qualified alternatives such as the SN74BCT25244QPWRQ1 or consult TI's automotive logic portfolio-never assume SN74BCT25244NT meets automotive requirements based on its performance alone.
SN74BCT25244NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 80mA, 188mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74BCT25244NT FAQ
1.How can I place an order for SN74BCT25244NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT25244NT 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 SN74BCT25244NT reliable?
The price and inventory of SN74BCT25244NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT25244NT is usually 5 days.
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SN74BCT25244NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT25244NT 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 SN74BCT25244NT?
For technical support, including SN74BCT25244NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT25244NT requirements.
6.How does Aetrix verify that SN74BCT25244NT is sourced from the original manufacturer or authorized distributors?
All SN74BCT25244NT 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 SN74BCT25244NT meets industry standards.
7.What is the process for return or replacement of SN74BCT25244NT?
All SN74BCT25244NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT25244NT, 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 SN74BCT25244NT part is unused and in its original packaging.
Return procedure for SN74BCT25244NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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