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Texas Instruments SN74BCT541ADWR
- Part No.:
- SN74BCT541ADWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74BCT541ADWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,759
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Product details
Overview
SN74BCT541ADWR from Texas Instruments is an octal non-inverting buffer/driver with 3-state outputs, designed for bus line driving and memory address register buffering in 5-V TTL-compatible systems. It operates from 4.5 V to 5.5 V, features BiCMOS architecture, supports 128 mA low-level output current, and uses dual active-low output-enable inputs (OE1, OE2) for independent 3-state control of eight channels.
For engineers reviewing the SN74BCT541ADWR datasheet, SN74BCT541ADWR pinout, SN74BCT541ADWR application, or SN74BCT541ADWR equivalent, this device is selected for high-drive, low-ICCZ bus interfacing where data flow-through pinout and P-N-P input stage reduce DC loading on upstream logic.
Technical Context
The SN74BCT541ADWR implements a dual-gated 3-state control architecture: both OE1 and OE2 must be low for outputs Y1–Y8 to drive; either OE high forces all outputs into high-impedance. Its BiCMOS design integrates bipolar output stages for high sink current (128 mA) with CMOS input logic for low input current and reduced ICCZ quiescent supply current (5–7 mA).
Input structure uses P-N-P transistors to minimize DC loading on preceding TTL or BCT drivers, while the data flow-through pinout-inputs on one side (pins 1–9), outputs on the opposite side (pins 12–20)-simplifies PCB trace routing for parallel bus applications and reduces crosstalk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and BCT logic families without level-shifting. |
| Low-Level Output Current | 64 mA per output - Sustains robust bus driving under heavy capacitive loads (e.g., >100 pF) without excessive VOL rise. |
| Propagation Delay | 1.7–6.0 ns (tPLH/tPHL) - Enables reliable operation in high-speed address/data paths up to ~100 MHz clock domains. |
| 3-State Enable/Disable Time | 3.0–10.7 ns (tPZH/tPZL/tPHZ/tPLZ) - Supports fast bus turnaround in shared-memory or peripheral arbitration systems. |
| Input Clamp Current | –18 mA - Protects inputs against transient overvoltage events common in hot-swap or noisy industrial environments. |
| Quiescent Supply Current (ICCZ) | 5–7 mA - Significantly lower than legacy TTL buffers, reducing system-level power budget in multi-driver configurations. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded control, instrumentation, and computing applications. |
Pinout & Package
SN74BCT541ADWR is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body size, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant with NiPdAu lead finish and Level-1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE1 | Active-low output-enable input for first group of four drivers (Y1–Y4); tied high to disable outputs during power-up. |
| 2–9 | A1–A8 | Non-inverting data inputs; P-N-P input structure minimizes DC loading on upstream TTL/BCT sources. |
| 10 | GND | Ground reference for all internal circuitry and output stage return path. |
| 11 | VCC | +5 V supply input; decoupling capacitor required within 1 cm for stable high-speed switching. |
| 12 | OE2 | Active-low output-enable input for second group of four drivers (Y5–Y8); enables independent bus segment control. |
| 13–20 | Y1–Y8 | 3-state buffered outputs; each sinks up to 64 mA at VOL ≤ 0.55 V, suitable for direct connection to 50 Ω transmission lines or TTL bus loads. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Combines bipolar output drive strength with CMOS input efficiency, achieving 128 mA sink capability and <7 mA ICCZ. |
| Data flow-through pinout | Inputs (pins 1–9) and outputs (pins 13–20) on opposite sides - eliminates layer crossings and reduces PCB trace inductance in dense bus layouts. |
| Dual independent 3-state controls | OE1/OE2 allow partitioning of the eight outputs into two isolated groups for selective bus arbitration or memory bank enable. |
| P-N-P input stage | Reduces input current to ≤0.6 mA (IIL), preventing loading-induced timing skew when driven by multiple upstream TTL gates. |
| High noise immunity | VIH = 2.0 V min and VIL = 0.8 V max ensure robust operation across voltage droop and EMI in industrial backplanes. |
Applications
| Memory Address Buffering | Parallel Bus Driver |
|---|---|
Use Scenario: Buffering 8-bit address lines between microcontroller and SRAM or EPROM in embedded control systems. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-state outputs isolates address bus during DMA cycles or peripheral access. Use Value: Prevents address contention and ensures clean signal edges at 10–20 ns propagation delay, supporting 50-MHz bus timing margins. |
Use Scenario: Driving shared 8-bit data bus among multiple peripherals (ADC, DAC, I/O expanders) in test equipment. IC Role / Device Role / Timing Role: Bidirectional bus driver controlled via OE1/OE2 to manage direction and enable timing. Use Value: 64 mA sink current maintains VOL ≤ 0.55 V under 50-pF load, ensuring TTL-compatible logic levels across 15-cm traces. |
| Industrial Backplane Interface | Legacy System Bus Extender |
Use Scenario: Interfacing modern FPGA I/O banks to legacy 5-V TTL backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Level-shifting buffer with high noise immunity and low ICCZ for low-power standby modes. Use Value: P-N-P inputs draw only 0.6 mA IIL, avoiding fanout limitations when driving multiple downstream receivers. |
Use Scenario: Replacing obsolete 74LS244 in aging computer motherboard designs requiring higher drive strength. IC Role / Device Role / Timing Role: Pin-compatible upgrade offering 2× sink current and 50% lower quiescent power vs. LS family. Use Value: Maintains identical footprint and logic function while improving bus settling time and thermal margin in compact enclosures. |
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 |
|---|---|---|---|
| SN74ACT541PW | CMOS-based, 4.5–5.5 V supply, 24 mA IOL, 10 ns typical tPD, lower ICC but reduced drive strength. | Suitable for low-power, noise-sensitive applications; insufficient for >30 mA bus loads. | Select when power efficiency > drive strength, and system load capacitance < 30 pF. |
| SN74LS244N | Bipolar TTL, 4.75–5.25 V, 15 mA IOL, 15–20 ns tPD, higher ICC and input loading (IIL = –0.4 mA). | Legacy drop-in replacement with no BiCMOS benefits; requires tighter VCC regulation. | Choose only for exact form-fit-function replacement where SN74BCT541ADWR's performance advantages are unnecessary. |
Compared with SN74ACT541PW and SN74LS244N, the SN74BCT541ADWR uniquely balances high sink current (64 mA), low ICCZ (5–7 mA), and sub-6 ns propagation delay-making it optimal for demanding 5-V bus interfaces where both speed and drive strength are critical.
Availability
SN74BCT541ADWR is available at Aetrix Electronics and suitable for memory address buffering, parallel bus driving, industrial backplane interfacing, and legacy system bus extension requiring stable component supply and long-term industrial availability.
Supply support for SN74BCT541ADWR 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 industry-standard logic families.
The SN74BCT541ADWR belongs to TI's BCT (Bipolar-CMOS Transistor) logic series, engineered specifically for high-drive, low-power 5-V bus interfacing in industrial, computing, and instrumentation systems.
FAQ
What is the maximum output sink current specification for SN74BCT541ADWR?
The SN74BCT541ADWR is rated for 64 mA per output at VCC = 4.5 V and VOL ≤ 0.55 V, verified per the SCBS011E datasheet's electrical characteristics table. This value applies under steady-state DC conditions with one output active at a time; simultaneous multi-output operation requires derating based on thermal limits and total ICC.
Does SN74BCT541ADWR require external pull-up resistors on OE1 and OE2 pins?
Yes - to guarantee high-impedance outputs during power-up or power-down, OE1 and OE2 should each be tied to VCC through a pull-up resistor. The minimum resistance is determined by the current-sinking capability of the controlling logic; TI recommends ≥1 kΩ for standard TTL drivers, per the functional description in the SCBS011E datasheet.
Is SN74BCT541ADWR pin-compatible with SN74LS244N?
No - although both are 20-pin octal buffers with 3-state outputs, SN74BCT541ADWR has a data flow-through pinout (inputs on left, outputs on right), whereas SN74LS244N uses a mirrored layout (inputs and outputs interleaved). Direct PCB replacement requires board redesign; functional substitution is possible with logic-level and timing validation.
What is the thermal impedance (θJA) of the SN74BCT541ADWR in its SOIC (DW) package?
The SN74BCT541ADWR in the DW package has a specified junction-to-ambient thermal resistance (θJA) of 58°C/W, measured per JESD 51-7 under standard PCB mounting conditions (two-layer board, 1 in² copper pad). This value supports continuous operation at full drive strength up to 70°C ambient when properly decoupled and heatsinked.
Can SN74BCT541ADWR operate reliably at 4.5 V supply voltage?
Yes - the SN74BCT541ADWR is fully characterized from 4.5 V to 5.5 V. At VCC = 4.5 V, it delivers guaranteed VOL ≤ 0.55 V at 64 mA sink, VOH ≥ 2.0 V at –15 mA source, and tPD ≤ 6.0 ns, meeting all recommended operating conditions in the SCBS011E datasheet for commercial-temperature applications.
SN74BCT541ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74BCT541ADWR FAQ
1.How can I place an order for SN74BCT541ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT541ADWR 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 SN74BCT541ADWR reliable?
The price and inventory of SN74BCT541ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT541ADWR is usually 5 days.
3.What payment methods are accepted for SN74BCT541ADWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT541ADWR transactions.
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4.How is shipping managed for SN74BCT541ADWR?
SN74BCT541ADWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT541ADWR 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 SN74BCT541ADWR?
For technical support, including SN74BCT541ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT541ADWR requirements.
6.How does Aetrix verify that SN74BCT541ADWR is sourced from the original manufacturer or authorized distributors?
All SN74BCT541ADWR 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 SN74BCT541ADWR meets industry standards.
7.What is the process for return or replacement of SN74BCT541ADWR?
All SN74BCT541ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT541ADWR, 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 SN74BCT541ADWR part is unused and in its original packaging.
Return procedure for SN74BCT541ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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