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Texas Instruments SN74BCT25240DW
- Part No.:
- SN74BCT25240DW
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74BCT25240DW.pdf
- Description:
- BUS DRIVER, BCT/FBT SERIES
- Quantity:
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Inventory:1,150
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Product details
Overview
SN74BCT25240DW from Texas Instruments is an octal 25-Ω inverting buffer/line driver with dual 3-state enable control, designed for incident-wave switching on 25-Ω transmission lines. It sinks 188 mA per output (IOL), operates at 4.5–5.5 V, supports 0°C to 70°C ambient, and features distributed VCC/GND pins to suppress simultaneous-switching noise.
For engineers reviewing the SN74BCT25240DW datasheet, SN74BCT25240DW pinout, SN74BCT25240DW application, or SN74BCT25240DW equivalent, key selection criteria include 25-Ω line driving capability, dual independent 3-state enables (1OE/2OE), BiCMOS low ICCZ quiescent current (7–10 mA), and SOIC-24 package compatibility with legacy memory and clock bus systems.
Technical Context
The SN74BCT25240DW implements eight independent inverting buffers, each with separate input (A) and inverted output (Y), controlled by two dedicated 3-state enables (1OE for Y1–Y4, 2OE for Y5–Y8). Its BiCMOS architecture delivers high sink current while minimizing ICCZ during output disable.
It is optimized for incident-wave switching on controlled-impedance traces ≥25 Ω, using fast propagation delays (tPLH/tPHL ≤ 5 ns at 5 V) and low output capacitance (Co = 16.5 pF). Distributed power/ground pins reduce ground bounce and crosstalk during parallel output transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Sink Current (IOL) | 188 mA per channel - enables direct incident-wave driving of 25-Ω transmission lines without external termination. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5-V TTL/CMOS logic rails and industrial 5-V power domains. |
| Propagation Delay (tPLH/tPHL) | ≤5 ns at VCC = 5 V, CL = 50 pF - supports high-speed address and clock distribution in memory and bus systems. |
| Quiescent Supply Current (ICCZ) | 7–10 mA - significantly reduced vs. bipolar equivalents, lowering system-level power and thermal load. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and computing applications. |
| Input Clamp Current (IIK) | −18 mA - provides robust ESD protection (≥2000 V HBM) and tolerance to transient overvoltage on inputs. |
| Output Capacitance (Co) | 16.5 pF - minimizes capacitive loading on driven lines, preserving signal integrity in high-frequency bus environments. |
Pinout & Package
SN74BCT25240DW uses a 24-pin SOIC (Small-Outline Integrated Circuit) package with 300-mil body width and standard DW footprint. Pin spacing is 0.050 inch (1.27 mm), compliant with JEDEC MS-013AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 4, 6, 7, 9, 10, 12 | 1Y1–1Y4, 2Y1–2Y4 outputs | Inverted buffered outputs; each sinks up to 188 mA when enabled and pulled low. |
| 22, 20, 19, 17, 15, 14, 13, 18 | 1A1–1A4, 2A1–2A4 inputs | Non-inverting inputs feeding internal inverters; accept TTL-compatible voltage thresholds (VIL ≤ 0.5 V, VIH ≥ 2 V). |
| 23, 18 | 1OE, 2OE enables | Active-low 3-state controls: 1OE enables Y1–Y4 only; 2OE enables Y5–Y8 only - enables independent bus segment control. |
| 2, 5, 8, 11, 16, 21, 24 | GND / VCC | Distributed power/ground pins minimize simultaneous-switching noise and improve signal integrity across all 8 channels. |
Key Features
| Feature | Design Value |
|---|---|
| 25-Ω line driving capability | 188-mA IOL per output enables clean incident-wave switching on matched 25-Ω PCB traces without external series termination. |
| Dual independent 3-state enables | Separate 1OE and 2OE pins allow selective activation of two 4-bit output groups - critical for multi-segment bus arbitration and memory interleaving. |
| BiCMOS process technology | Combines bipolar speed and CMOS input impedance to achieve <5 ns propagation delay and <10 mA ICCZ - reduces power and noise vs. pure bipolar drivers. |
| Distributed VCC/GND pin layout | Seven power/ground pins interspersed across the SOIC-24 body suppress ground bounce and supply droop during full 8-output switching events. |
| ESD robustness | Exceeds 2000 V HBM and 200 V machine model - ensures reliability in manual handling and board-level assembly environments. |
Applications
| Memory Address Drivers | Clock Distribution Networks |
|---|---|
|
Use Scenario: Driving multiplexed address buses between CPU and SRAM/DRAM controllers where trace impedance is controlled to 25 Ω. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing low-skew, high-current address signal amplification with segment-selectable enable. Use Value: Eliminates need for external series resistors by matching 25-Ω line impedance directly, reducing BOM count and improving timing margin. |
Use Scenario: Distributing system clock signals to multiple synchronous peripherals (e.g., ADCs, FPGAs, memory controllers) over controlled-impedance PCB traces. IC Role / Device Role / Timing Role: Low-jitter, high-drive clock buffer with independent enable groups to gate clock delivery per subsystem. Use Value: Delivers 188-mA sink current to drive multiple loads simultaneously while maintaining <5 ns skew across all 8 outputs. |
| Bus Transceivers | High-Speed Data Receivers |
|
Use Scenario: Bidirectional data bus interfacing between microcontroller and peripheral ASICs using shared 25-Ω backplane or ribbon-cable interconnects. IC Role / Device Role / Timing Role: Octal inverting transceiver with dual OE control enabling direction-controlled data latching and bus isolation. Use Value: Dual enable pins allow time-multiplexed use of same physical bus lines for read/write cycles without contention. |
Use Scenario: Receiving high-speed digital video or test pattern data from LVDS or PECL sources via 25-Ω terminated lines into TTL-level logic. IC Role / Device Role / Timing Role: 25-Ω line receiver converting incident-wave signals to clean TTL-compatible logic levels with minimal added jitter. Use Value: Fast tPLH/tPHL (≤5 ns) and low Co (16.5 pF) preserve edge fidelity and support >100 MHz data rates in point-to-point links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AS240N | Higher IOL (48 mA), faster tPLH/tPHL (~3 ns), but bipolar-only (higher ICCZ ~150 mA), no distributed GND/VCC. | Limited to lower-density boards with ample power budget; unsuitable for noise-sensitive 25-Ω line driving due to lack of impedance-matched drive strength. | Choose only if raw speed outweighs power/noise constraints and 25-Ω line matching is not required. |
| SN74LVC240APW | 3.3-V only (1.65–3.6 V), lower IOL (24 mA), CMOS-only, TSSOP-20 package - no 25-Ω drive capability or 5-V compatibility. | Designed for modern low-voltage digital systems; incompatible with 5-V buses, memory controllers, or legacy clock trees requiring 25-Ω termination. | Select only for new 3.3-V designs where 25-Ω line driving is unnecessary and pin count allows TSSOP-20 adaptation. |
Compared with SN74AS240N and SN74LVC240APW, the SN74BCT25240DW uniquely combines 5-V operation, 188-mA 25-Ω line drive, dual 3-state enables, and distributed power integrity - making it irreplaceable for legacy high-speed bus and memory address applications requiring incident-wave signaling.
Availability
SN74BCT25240DW is available at Aetrix Electronics and suitable for memory address drivers, clock distribution networks, and bus-oriented receivers requiring stable component supply despite its obsolete status - supported via verified legacy inventory and cross-sourced alternatives with full parametric validation.
Supply support for SN74BCT25240DW 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74BCT25240DW belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, engineered specifically for high-speed, low-noise 25-Ω transmission line driving in memory and clock subsystems of 1990s-era computing and telecom infrastructure.
FAQ
What is the primary function of the SN74BCT25240DW?
The SN74BCT25240DW is an octal inverting 3-state buffer optimized for 25-Ω transmission line driving. It accepts TTL-compatible inputs, inverts them, and drives outputs with up to 188 mA sink current per channel. Its dual enable pins (1OE and 2OE) allow independent control of two 4-bit output groups, supporting segmented bus architectures in memory and clock systems.
Does the SN74BCT25240DW support 3.3-V operation?
No, the SN74BCT25240DW is specified only for 4.5 V to 5.5 V supply operation. Its input thresholds (VIH ≥ 2 V, VIL ≤ 0.5 V) and output drive characteristics are designed for 5-V TTL compatibility. Applying 3.3 V violates recommended operating conditions and will result in unreliable output states and degraded noise margins.
What does "incident-wave switching" mean for the SN74BCT25240DW?
Incident-wave switching means the SN74BCT25240DW delivers sufficient current (188 mA) to fully charge a 25-Ω transmission line's capacitance during the first signal edge - eliminating the need for end-of-line termination. This technique reduces reflections and improves timing margin in short, controlled-impedance traces typical in backplanes and high-density PCBs.
Why does the SN74BCT25240DW have multiple VCC and GND pins?
The SN74BCT25240DW uses seven distributed VCC and GND pins (pins 2, 5, 8, 11, 16, 21, 24) to minimize simultaneous-switching noise. When all eight outputs switch together, localized current surges are contained within adjacent power/ground pairs, reducing ground bounce and supply droop - critical for signal integrity in high-speed bus applications.
Is the SN74BCT25240DW still in active production?
No, Texas Instruments lists the SN74BCT25240DW as OBSOLETE in its packaging documentation. However, Aetrix Electronics maintains verified legacy stock with full traceability and offers engineering support for continuity planning, including validated drop-in alternatives and application-specific redesign guidance for the SN74BCT25240DW.
SN74BCT25240DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74BCT25240DW FAQ
1.How can I place an order for SN74BCT25240DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT25240DW 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 SN74BCT25240DW reliable?
The price and inventory of SN74BCT25240DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT25240DW is usually 5 days.
3.What payment methods are accepted for SN74BCT25240DW?
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4.How is shipping managed for SN74BCT25240DW?
SN74BCT25240DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT25240DW 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 SN74BCT25240DW?
For technical support, including SN74BCT25240DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT25240DW requirements.
6.How does Aetrix verify that SN74BCT25240DW is sourced from the original manufacturer or authorized distributors?
All SN74BCT25240DW 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 SN74BCT25240DW meets industry standards.
7.What is the process for return or replacement of SN74BCT25240DW?
All SN74BCT25240DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT25240DW, 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 SN74BCT25240DW part is unused and in its original packaging.
Return procedure for SN74BCT25240DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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