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Texas Instruments SN74BCT25244DWR
- Part No.:
- SN74BCT25244DWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT25244DWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,456
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Product details
Overview
SN74BCT25244DWR from Texas Instruments is a 25-Ω octal buffer/driver with 3-state outputs, designed for incident-wave switching on 25-Ω transmission lines in memory address and clock distribution systems. It delivers 188-mA low-level output current (IOL), operates at 4.5–5.5 V supply, and supports 0°C to 70°C industrial temperature range in a 24-pin SOIC (DW) package.
For engineers reviewing the SN74BCT25244DWR datasheet, SN74BCT25244DWR pinout, SN74BCT25244DWR application, or SN74BCT25244DWR equivalent, key selection criteria include 25-Ω line driving capability, simultaneous switching noise suppression via distributed VCC/GND pins, high-current 3-state bus interface performance, and compatibility with legacy TTL/CMOS logic levels.
Technical Context
This BiCMOS octal buffer integrates eight independent non-inverting drivers, each with dedicated output-enable control (1OE, 2OE). Its 25-Ω output impedance is engineered for controlled-impedance transmission-line termination without external resistors, enabling clean incident-wave switching on PCB traces or backplanes.
Each driver supports true 3-state operation with fast enable/disable timing (tPZH ≤ 9.3 ns, tPHZ ≤ 6.3 ns at 5 V), low ICCZ quiescent current (7–11 mA), and ESD protection exceeding 2000 V (HBM) and 200 V (MM). Distributed power/ground pins reduce simultaneous switching noise across all eight outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL/CMOS systems and margin against rail droop. |
| Low-Level Output Current (IOL) | 188 mA - enables direct driving of 25-Ω transmission lines without series termination resistors. |
| Propagation Delay (tPLH/tPHL) | 1–5.6 ns - supports high-speed address and clock distribution up to ~200 MHz system timing. |
| 3-State Enable/Disable Time (tPZH/tPHZ) | 3.2–9.3 ns - allows precise bus arbitration and avoids contention during state transitions. |
| Input Clamp Current (IIK) | –18 mA - protects inputs against negative transients while maintaining logic integrity. |
| ICCZ Quiescent Current | 7–11 mA - reduces standby power in high-density bus driver arrays compared to earlier bipolar designs. |
| ESD Rating (HBM) | >2000 V - meets MIL-STD-883C for robust handling in manufacturing and field environments. |
Pinout & Package
SN74BCT25244DWR is housed in a 24-pin plastic small-outline integrated circuit (SOIC) package (DW), with 300-mil body width, gull-wing leads, and RoHS-compliant NiPdAu (NIPDAU) finish. Pin 1 orientation follows Q1 quadrant assignment per tape-and-reel packaging standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13, 24 | Output Enable (1OE, 2OE) | Active-low controls enable/disable for first four and last four drivers respectively; critical for bus isolation. |
| 2–5, 18–21 | Data Inputs (1A1–1A4, 2A1–2A4) | Non-inverting input terminals accepting TTL/CMOS-compatible logic levels. |
| 6–9, 10–12, 14–17 | Outputs (1Y1–1Y4, 2Y1–2Y4) | 25-Ω low-impedance drivers capable of sinking 188 mA; support incident-wave line driving. |
| 11, 16, 22 | GND | Distributed ground pins minimize simultaneous switching noise and improve signal integrity. |
| 10, 15, 23 | VCC | Distributed power pins decouple supply for stable operation during multi-output switching. |
| NC (Pins 7, 8, 20) | No Internal Connection | Unbonded pads; must remain unconnected to avoid parasitic coupling or mechanical stress. |
Key Features
| Feature | Design Value |
|---|---|
| 25-Ω Output Impedance | Enables direct incident-wave switching on matched 25-Ω PCB traces-eliminates need for external series termination resistors. |
| Distributed VCC/GND Pins | Three VCC and three GND pins reduce simultaneous switching noise by >30% versus single-rail SOIC layouts. |
| BiCMOS Process Technology | Combines bipolar speed and CMOS input stage-reduces ICCZ by 40% vs. pure bipolar BCT predecessors. |
| High-Current 3-State Outputs | 188-mA IOL supports driving unterminated stubs or long backplane traces without signal reflection artifacts. |
| MIL-STD-883C ESD Protection | Exceeds 2000 V HBM-ensures reliability during board assembly and field service in industrial environments. |
Applications
| Memory Address Buffering | Clock Distribution Network |
|---|---|
Use Scenario: Driving parallel address buses between microprocessor and SRAM/ROM in embedded controllers. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing low-skew, high-drive address signals with 3-state isolation during DMA cycles. Use Value: 25-Ω output impedance matches trace impedance to suppress reflections; 188-mA drive ensures full logic swing across 10-cm routed buses. | Use Scenario: Distributing system clock to multiple synchronous peripherals (e.g., ADCs, FPGAs, DACs) on a shared backplane. IC Role / Device Role / Timing Role: Low-jitter, high-fanout clock driver with controlled edge rates to maintain signal integrity across multiple loads. Use Value: Fast tPLH/tPHL (≤5.6 ns) and distributed VCC/GND minimize skew and ground bounce across eight outputs. |
| Bus Transceiver Interface | Legacy System Bus Extension |
Use Scenario: Isolating and buffering data/address/control lines between ISA or PCI-X legacy subsystems and modern bridge ICs. IC Role / Device Role / Timing Role: Bidirectional bus driver with independent OE control per group, supporting hot-swap and partial bus arbitration. Use Value: Independent 1OE/2OE pins allow selective activation of upper/lower nibbles-enabling partial bus updates without full cycle stalls. | Use Scenario: Extending TTL-compatible control buses in test equipment or industrial PLC backplanes with long trace runs. IC Role / Device Role / Timing Role: High-current line driver compensating for capacitive loading and IR drop over 30 cm of 25-Ω routing. Use Value: 188-mA sink capability maintains VOL ≤ 0.55 V even under 100-pF load-preserving noise margin in noisy factory environments. |
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 |
|---|---|---|---|
| SN74ABT244DW | Higher drive (64 mA IOL), lower output impedance (~15 Ω), ABT logic family with improved AC specs. | Better suited for 50-Ω systems and higher-frequency buses (>100 MHz); less optimal for 25-Ω incident-wave use. | Select SN74ABT244DW only when upgrading to faster, lower-noise 50-Ω infrastructure-requires layout review due to different timing and drive strength. |
| SN74LS244N | Bipolar TTL design, 24-mA IOL, no 25-Ω matching, higher ICC, slower propagation (15–25 ns). | Limited to low-speed, short-run 5-V bus interfaces where impedance control is not required. | Choose SN74LS244N only for cost-sensitive, low-frequency replacements where 25-Ω line driving and low ICCZ are not needed. |
Compared with SN74ABT244DW and SN74LS244N, the SN74BCT25244DWR uniquely balances 25-Ω transmission-line optimization, 188-mA drive, and BiCMOS power efficiency-making it irreplaceable for legacy high-current, impedance-controlled bus designs without redesigning trace topology.
Availability
SN74BCT25244DWR is available at Aetrix Electronics and suitable for memory address buffering, clock distribution networks, and legacy bus transceiver interfaces requiring stable component supply, long-term industrial lifecycle support, and verified 25-Ω line-driving performance.
Supply support for SN74BCT25244DWR 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 high-reliability logic families.
The SN74BCT25244DWR belongs to TI's BCT (Bipolar-CMOS Transistor) logic series-designed specifically for high-current, low-noise, impedance-matched bus interfacing in industrial and computing systems operating at 5 V.
FAQ
What is the maximum output current capability of the SN74BCT25244DWR?
The SN74BCT25244DWR provides a guaranteed low-level output current (IOL) of 188 mA per channel under recommended operating conditions (VCC = 4.5 V, TA = 25°C). This high sink capability enables direct driving of 25-Ω transmission lines without external termination resistors, making the SN74BCT25244DWR ideal for incident-wave switching in memory and clock distribution applications.
Does the SN74BCT25244DWR support 3.3-V logic inputs?
No-the SN74BCT25244DWR is a 5-V-only device with TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and requires VCC = 4.5–5.5 V. It does not support 3.3-V logic levels directly; interfacing with 3.3-V systems requires level-shifting circuitry. The SN74BCT25244DWR is not 3.3-V tolerant and may be damaged if VI exceeds VCC + 0.5 V.
How many independent output-enable controls does the SN74BCT25244DWR have?
The SN74BCT25244DWR features two independent active-low output-enable inputs: 1OE (pin 1) controls Y1–Y4, and 2OE (pin 13) controls Y5–Y8. This dual-OE architecture allows selective activation of upper and lower quad groups-enabling partial bus updates, reduced switching noise, and flexible arbitration in multi-master systems using the SN74BCT25244DWR.
What is the operating temperature range for the SN74BCT25244DWR?
The SN74BCT25244DWR is characterized for operation from 0°C to 70°C (industrial grade), as confirmed in the official Texas Instruments datasheet SCBS064A. This distinguishes it from the military-grade SN54BCT25244 (–55°C to 125°C). The SN74BCT25244DWR's thermal specification is fully validated and applies to all SOIC (DW) packaged units, including the DWR tape-and-reel variant.
Is the SN74BCT25244DWR pin-compatible with other 24-pin octal buffers like the SN74LS244?
No-the SN74BCT25244DWR has a unique pinout optimized for noise reduction, with three VCC (pins 10, 15, 23) and three GND (pins 11, 16, 22) pins, plus NC positions (pins 7, 8, 20). The SN74LS244 uses a conventional single-VCC/single-GND layout. Direct replacement would cause power integrity failure and signal corruption; the SN74BCT25244DWR requires its specific footprint and layout guidelines.
SN74BCT25244DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74BCT25244DWR FAQ
1.How can I place an order for SN74BCT25244DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT25244DWR 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 SN74BCT25244DWR reliable?
The price and inventory of SN74BCT25244DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT25244DWR is usually 5 days.
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SN74BCT25244DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT25244DWR 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 SN74BCT25244DWR?
For technical support, including SN74BCT25244DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT25244DWR requirements.
6.How does Aetrix verify that SN74BCT25244DWR is sourced from the original manufacturer or authorized distributors?
All SN74BCT25244DWR 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 SN74BCT25244DWR meets industry standards.
7.What is the process for return or replacement of SN74BCT25244DWR?
All SN74BCT25244DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT25244DWR, 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 SN74BCT25244DWR part is unused and in its original packaging.
Return procedure for SN74BCT25244DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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