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Texas Instruments SN74BCT541ANSR
- Part No.:
- SN74BCT541ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74BCT541ANSR.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,400
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Product details
Overview
SN74BCT541ANSR from Texas Instruments is an octal 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 technology to reduce ICCZ quiescent current, and supports high-speed data flow-through pinout with inputs and outputs on opposite package sides.
For engineers reviewing the SN74BCT541ANSR datasheet, SN74BCT541ANSR pinout, SN74BCT541ANSR application, or SN74BCT541ANSR equivalent, this device delivers verified 3-state control via dual active-low OE inputs, 64 mA low-level output drive, and sub-8 ns propagation delay-critical for reliable address/data bus isolation in industrial and embedded computing designs.
Technical Context
The SN74BCT541ANSR implements a dual 4-bit 3-state buffer architecture with two independent active-low output-enable (OE1, OE2) inputs controlling all eight Y outputs simultaneously. Each channel uses P-N-P input circuitry to minimize DC loading on upstream logic.
Its BiCMOS design combines bipolar input stages for TTL compatibility and CMOS output stages for reduced power consumption and improved noise immunity. The data flow-through pinout-inputs on one side, outputs on the other-enables straightforward PCB routing for parallel bus interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures robust operation across standard 5-V TTL supply tolerances. |
| Low-Level Output Current | 64 mA - Sufficient to drive heavy capacitive bus loads without signal degradation. |
| Propagation Delay (tPLH/tPHL) | 1.7–6.0 ns - Enables high-speed address/data transfer in memory subsystems up to ~100 MHz. |
| 3-State Enable/Disable Time | tPZH/tPLZ ≤ 10.7 ns - Guarantees fast bus turnaround during multiplexed read/write cycles. |
| Input Capacitance (Ci) | 5 pF - Minimizes loading on preceding logic stages, preserving timing margins. |
| Quiescent Supply Current (ICCZ) | 5–7 mA - Significantly lower than legacy TTL buffers, reducing system power overhead. |
| Output Leakage (IOZL/IOZH) | ±50 µA - Ensures stable high-impedance state during bus contention or power sequencing. |
Pinout & Package
SOP-20 (NS package), 0.300-inch body width, 1.27 mm pitch, 2.65 mm max height. RoHS-compliant, green (no Sb/Br), NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | Non-inverting data inputs; P-N-P structure reduces DC loading on upstream drivers. |
| 9 | GND | Ground reference for all internal circuitry and output stage return path. |
| 10 | VCC | Positive supply rail (4.5–5.5 V); powers both input and output stages. |
| 11, 19 | OE1, OE2 | Active-low 2-input AND gate enables - either high forces all Y outputs into high-Z. |
| 12–18, 20 | Y1–Y8 Outputs | 3-state totem-pole outputs; capable of sinking 64 mA or sourcing –15 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Data flow-through pinout | Inputs (A1–A8) on left side, outputs (Y1–Y8) on right side - simplifies layer routing and minimizes trace crosstalk on dense PCBs. |
| Dual active-low 3-state control | OE1 and OE2 form an AND gate - allows flexible bus arbitration using separate enable signals per subsystem segment. |
| P-N-P input structure | Reduces input DC loading to ≤0.6 mA (IIL), preventing excessive fanout degradation in cascaded TTL chains. |
| BiCMOS process technology | Combines TTL-compatible input thresholds with CMOS output efficiency - cuts ICCZ by >50% vs. pure bipolar BCT devices. |
| High-speed switching | Max tPHL = 8.2 ns at VCC = 4.5 V - supports clean transitions on 20-ns clock cycles in memory controllers. |
Applications
| Memory Address Buffering | System Bus Isolation |
|---|---|
|
Use Scenario: Buffering 8-bit address lines between microcontroller and SRAM or EPROM in embedded instrumentation. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-state outputs isolates address bus during DMA or peripheral access. Use Value: Prevents address glitches during bus contention; 64 mA drive ensures full-swing logic levels across 10-cm traces. |
Use Scenario: Enabling/disabling data paths between CPU and multiple peripherals sharing a common 8-bit data bus. IC Role / Device Role / Timing Role: Bidirectional bus driver controlled by OE1/OE2 to manage bus ownership timing. Use Value: Sub-11 ns enable/disable times allow rapid bus handoff without hold-time violations. |
| Industrial PLC I/O Expansion | Legacy ISA Bus Interface |
|
Use Scenario: Interfacing microcontroller GPIOs to opto-isolated digital I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer for 5-V TTL-compatible control signals. Use Value: P-N-P inputs tolerate slow-rising edges from optocouplers; 5 pF Ci avoids timing skew in multi-channel sync. |
Use Scenario: Adapting modern microcontrollers to legacy ISA bus timing requirements in retro-computing or test equipment. IC Role / Device Role / Timing Role: Address latch enable and data bus transceiver in ISA slot interface logic. Use Value: Verified 8.2 ns max tPHL meets ISA's 15 ns address setup window; SOP-20 footprint fits compact backplane layouts. |
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 |
|---|---|---|---|
| SN74LS244N | Bipolar TTL only; higher ICC (47–72 mA), slower tPHL (15–25 ns), no BiCMOS power savings. | Limited to lower-speed 5-V systems where quiescent current is not critical. | Choose when legacy LS compatibility is mandatory and speed/power trade-offs are acceptable. |
| SN74LVC244APWR | 3.3-V CMOS; 3.6-V max VCC, ±24 mA IOL/IOH, 3.3-V logic thresholds, no TTL input compatibility. | Requires level translation for 5-V bus interfacing; unsuitable for direct TTL replacement. | Prefer for new 3.3-V designs with strict power budgets; avoid in mixed-voltage 5-V environments. |
Compared with SN74LS244N and SN74LVC244APWR, the SN74BCT541ANSR uniquely delivers TTL-compatible inputs, 5-V operation, 64 mA drive, and BiCMOS efficiency-making it the only drop-in solution for upgrading legacy 5-V bus buffers without redesigning voltage domains or timing margins.
Availability
SN74BCT541ANSR is available at Aetrix Electronics and suitable for memory address buffering, system bus isolation, industrial PLC I/O expansion, and legacy ISA bus interface applications requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74BCT541ANSR 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 over 90 years of innovation in industrial, automotive, and communications markets.
The SN74BCT541ANSR belongs to TI's BCT logic family, engineered specifically for high-drive, low-power 5-V bus interfacing in mission-critical industrial and computing systems where reliability and timing precision are non-negotiable.
FAQ
What is the recommended power-up sequence for SN74BCT541ANSR to ensure reliable 3-state behavior?
To prevent output contention during power-up, tie OE1 and OE2 to VCC through a pullup resistor (minimum value determined by driver sink capability). This forces all Y outputs into high-impedance before VCC stabilizes. The SN74BCT541ANSR datasheet specifies this method to guarantee safe initialization. Do not leave OE pins floating - the SN74BCT541ANSR requires defined logic states at power-on to avoid bus conflicts.
Can SN74BCT541ANSR drive a 50-pF bus load while maintaining TTL logic thresholds?
Yes - the SN74BCT541ANSR is characterized with CL = 50 pF and delivers VOH ≥ 2.4 V (min) at IOH = –15 mA and VOL ≤ 0.55 V (max) at IOL = 64 mA under recommended conditions. Its BiCMOS output stage maintains full TTL swing across that load, and its 5 pF input capacitance prevents excessive loading on upstream drivers. This makes the SN74BCT541ANSR suitable for standard 5-V bus designs with typical trace + stub capacitance.
Is SN74BCT541ANSR pin-compatible with SN74BCT541AN or SN74BCT541ADWR?
Yes - SN74BCT541ANSR (SOP-20 NS), SN74BCT541AN (PDIP-20 N), and SN74BCT541ADWR (SOIC-20 DW) share identical pinout, function mapping, and electrical specifications. All three packages use the same 20-pin layout with A1–A8, GND, VCC, OE1, OE2, and Y1–Y8 in identical positions. The SN74BCT541ANSR is a direct physical and functional replacement for those variants in surface-mount designs.
What is the maximum continuous output current rating for SN74BCT541ANSR per output pin?
The SN74BCT541ANSR supports 64 mA sink current (IOL) per output in the low state, verified across the full operating temperature range (0°C to 70°C). This rating applies under steady-state DC conditions with proper thermal management. Exceeding 64 mA risks exceeding absolute maximum ratings and may cause permanent damage. The SN74BCT541ANSR does not support parallel output tying unless explicitly designed for wire-OR - each Y pin must drive its own load.
Does SN74BCT541ANSR support hot-swap or live-insertion into a powered bus?
No - the SN74BCT541ANSR is not hot-swap rated. Its absolute maximum ratings specify VO ≤ 5.5 V on disabled outputs, and applying bus voltage before VCC stabilization may violate this limit. TI recommends powering VCC before applying signal voltages. For hot-swap applications, consider dedicated hot-swap controllers or buffers with built-in bus protection - the SN74BCT541ANSR requires controlled power sequencing to avoid latch-up or overstress.
SN74BCT541ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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-SO
SN74BCT541ANSR FAQ
1.How can I place an order for SN74BCT541ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT541ANSR 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 SN74BCT541ANSR reliable?
The price and inventory of SN74BCT541ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT541ANSR is usually 5 days.
3.What payment methods are accepted for SN74BCT541ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT541ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT541ANSR?
SN74BCT541ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT541ANSR 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 SN74BCT541ANSR?
For technical support, including SN74BCT541ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT541ANSR requirements.
6.How does Aetrix verify that SN74BCT541ANSR is sourced from the original manufacturer or authorized distributors?
All SN74BCT541ANSR 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 SN74BCT541ANSR meets industry standards.
7.What is the process for return or replacement of SN74BCT541ANSR?
All SN74BCT541ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT541ANSR, 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 SN74BCT541ANSR part is unused and in its original packaging.
Return procedure for SN74BCT541ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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