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Texas Instruments SN74LS541DWR
- Part No.:
- SN74LS541DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LS541DWR.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,330
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Product details
Overview
SN74LS541DWR from Texas Instruments is an octal buffer/line driver with 3-state outputs, designed for bidirectional data bus interfacing in TTL-based digital systems. It features high-impedance outputs when disabled (OE = HIGH), 16 mA output sink capability per channel, and operates over 0°C to 70°C. It is commonly used in microprocessor address/data bus isolation and memory I/O expansion.
For engineers reviewing the SN74LS541DWR datasheet, SN74LS541DWR pinout, SN74LS541DWR application, or SN74LS541DWR equivalent, this page delivers verified electrical specs, SOIC-20 package details, functional role in bus buffering, and validated alternative options for legacy TTL system design and obsolescence mitigation.
Technical Context
The SN74LS541DWR implements eight non-inverting buffers with independent 3-state control via a single active-low Output Enable (OE) input. All outputs enter high-impedance state when OE is HIGH, enabling shared-bus operation without contention. Its LS-TTL logic family ensures compatibility with standard 74LS series inputs and outputs.
It uses bipolar transistor-transistor logic (TTL) with Schottky clamping for reduced propagation delay (typ. 15 ns at VCC = 5 V, CL = 15 pF) and improved switching speed over standard TTL. Input thresholds and output voltage levels comply with JEDEC Standard No. 7A for LS-TTL.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - Ensures interoperability with 74LS-series devices and defined noise margins (VIL ≤ 0.8 V, VIH ≥ 2.0 V). |
| Supply Voltage | 4.75 V to 5.25 V - Tight regulation required; operation outside this range risks logic instability or damage. |
| Output Drive | 16 mA sink / 0.4 mA source - Supports direct connection to multiple LS-TTL inputs (fan-out ≥ 20) without external pull-ups. |
| Propagation Delay | 15 ns max (tPLH/tPHL, VCC = 5 V, CL = 15 pF) - Enables reliable timing in 33 MHz–40 MHz bus cycles with margin. |
| Operating Temperature | 0°C to +70°C - Qualified for commercial-grade applications including industrial control panels and test equipment. |
| Package | SOIC-20 (DW) - Surface-mount, 7.5 mm × 12.8 mm body, 1.27 mm pitch; compatible with standard reflow profiles (Level-1-260°C-UNLIM). |
Pinout & Package
SN74LS541DWR is housed in a 20-pin Small Outline Integrated Circuit (SOIC) package (DW suffix), measuring 7.5 mm × 12.8 mm with 1.27 mm lead pitch and maximum height of 2.65 mm. Pin 1 is located at the top-left corner adjacent to the index marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low Output Enable | Drives all eight outputs into high-impedance state when HIGH; enables buffering when LOW. |
| 2–9 (A1–A8) | Inputs | Non-inverting data inputs; accept standard LS-TTL logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V). |
| 11–18 (Y1–Y8) | 3-State Outputs | Buffered, non-inverting outputs; each sinks up to 16 mA or sources 0.4 mA in active state. |
| 10 (GND) | Ground Reference | Power return path for all internal circuitry; must be low-impedance and decoupled near device. |
| 20 (VCC) | Positive Supply | 5 V ±5% DC supply; requires local 0.1 µF ceramic decoupling capacitor between Pins 20 and 10. |
Key Features
| Feature | Design Value |
|---|---|
| Octal non-inverting 3-state buffer | Enables bidirectional bus control using one shared OE signal-simplifies PCB routing versus individual enable lines. |
| High-output drive (16 mA sink) | Directly drives 20+ LS-TTL inputs or interfaces with legacy CMOS loads without level-shifting or buffering. |
| Matched propagation delays (tPLH ≈ tPHL) | Minimizes skew across all eight channels-critical for synchronous data capture in parallel bus architectures. |
| SOIC-20 RoHS-compliant packaging | Supports automated SMT assembly and IPC-7351-compliant land patterns; NIPDAU finish ensures solderability. |
Applications
| Microprocessor Bus Interface | Memory Address Latching |
|---|---|
Use Scenario: Isolating CPU address/data bus from peripheral logic during DMA or interrupt cycles. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer that enables/disables data flow under control of CPU's bus grant signals. Use Value: Prevents bus contention and signal corruption while maintaining full 8-bit throughput with <15 ns latency. |
Use Scenario: Driving address lines to static RAM or EPROM chips in embedded controller systems. IC Role / Device Role / Timing Role: Non-inverting buffer amplifying weak microcontroller address outputs to meet memory setup/hold timing. Use Value: Guarantees clean, slew-controlled edges and sufficient current to charge address line capacitance across 10+ cm traces. |
| Industrial I/O Expansion | Legacy Test Equipment Signal Conditioning |
Use Scenario: Adding parallel digital I/O ports to PLC modules using discrete TTL-compatible peripherals. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer between MCU GPIO and opto-isolated output drivers. Use Value: Provides 16 mA drive per channel to directly energize LED indicators or relay coils without external transistors. |
Use Scenario: Replacing failed buffers in vintage oscilloscopes, logic analyzers, and calibration instruments. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 74LS244/74LS240 in signal path conditioning stages. Use Value: Matches original timing, voltage thresholds, and pinout-enabling field repair without board redesign. |
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 | Identical function and pinout; dual 4-bit configuration with separate OE controls per group (1OE, 2OE). | Offers independent enable for two 4-bit buses; less suitable for unified 8-bit enable but better for segmented addressing. | Select SN74LS244N when separate control of high/low nibble is required; otherwise SN74LS541DWR provides simpler single-OE operation. |
| SN74HC244PW | CMOS technology; wider VCC range (2 V–6 V); lower power; higher speed (tPD ≈ 8 ns); different input thresholds. | Not TTL-compatible-requires level translation if interfacing with legacy LS-TTL logic; unsuitable for direct drop-in replacement. | Choose SN74HC244PW only in new designs with pure CMOS signaling or when power/performance outweighs compatibility needs. |
Compared with SN74LS244N, SN74LS541DWR simplifies control with one OE pin instead of two, reducing FPGA/GPIO resource usage; compared with SN74HC244PW, it preserves native LS-TTL voltage compatibility and eliminates need for external level shifters in legacy systems.
Availability
SN74LS541DWR is available at Aetrix Electronics and suitable for industrial control panels, legacy test equipment refurbishment, and microprocessor bus interface applications requiring stable component supply across extended product lifecycles.
Supply support for SN74LS541DWR 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 U.S.-based semiconductor company founded in 1930, specializing in analog ICs, embedded processors, and logic devices with broad industrial and automotive qualification.
The SN74LS541DWR belongs to TI's legacy 74LS logic family, engineered for robustness and interoperability in commercial-grade digital systems where TTL compatibility, predictable timing, and proven reliability are essential.
FAQ
What is the function of Pin 1 (OE) on the SN74LS541DWR?
Pin 1 is the active-low Output Enable (OE) input. When OE is LOW, all eight outputs (Y1–Y8) actively drive their respective inputs (A1–A8) with non-inverting logic. When OE is HIGH, all outputs enter high-impedance (Hi-Z) state, effectively disconnecting the device from the bus. This behavior is fundamental to the SN74LS541DWR's role in shared-bus architectures and is electrically specified in the TI SDLS180 datasheet.
Can SN74LS541DWR replace SN74LS244 in existing designs?
Yes, SN74LS541DWR can replace SN74LS244 in many cases-but only if the design uses a single enable signal for all eight drivers. Unlike SN74LS244, which has two independent 4-bit groups (each with its own OE), SN74LS541DWR uses one shared OE. Verify that your schematic ties both OE pins of SN74LS244 together before substituting SN74LS541DWR to ensure identical functional behavior.
What is the maximum capacitive load the SN74LS541DWR can drive reliably?
The SN74LS541DWR is characterized for CL = 15 pF in timing specifications (e.g., 15 ns propagation delay). While it can drive higher capacitance, performance degrades: rise/fall times increase and propagation delay grows linearly with load. For loads exceeding 40 pF, add series termination or reduce trace length. The SN74LS541DWR's 16 mA sink strength supports typical board-level bus capacitance up to ~30 pF without signal integrity loss.
Is SN74LS541DWR RoHS compliant?
Yes, SN74LS541DWR is RoHS compliant, with lead finish specified as NIPDAU (Nickel/Palladium/Gold) and marked "Yes" in TI's official packaging documentation. It meets EU Directive 2011/65/EU requirements and is suitable for use in environmentally regulated commercial electronics. Always verify compliance status using TI's official part search or packaging addendum for the specific date-code lot.
Does SN74LS541DWR support mixed-voltage interfacing (e.g., 3.3 V logic)?
No, SN74LS541DWR is strictly a 5 V-only LS-TTL device. Its input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and output voltages (VOH ≥ 2.7 V, VOL ≤ 0.5 V at 16 mA) are optimized for 5 V operation. Driving it from 3.3 V logic may result in marginal or invalid HIGH recognition; connecting its outputs to 3.3 V inputs risks overvoltage damage. Use level translators or compatible 3.3 V–tolerant buffers instead of SN74LS541DWR in mixed-voltage systems.
SN74LS541DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- 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, 24mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74LS541DWR FAQ
1.How can I place an order for SN74LS541DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS541DWR 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 SN74LS541DWR reliable?
The price and inventory of SN74LS541DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS541DWR is usually 5 days.
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SN74LS541DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS541DWR 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 SN74LS541DWR?
For technical support, including SN74LS541DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS541DWR requirements.
6.How does Aetrix verify that SN74LS541DWR is sourced from the original manufacturer or authorized distributors?
All SN74LS541DWR 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 SN74LS541DWR meets industry standards.
7.What is the process for return or replacement of SN74LS541DWR?
All SN74LS541DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS541DWR, 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 SN74LS541DWR part is unused and in its original packaging.
Return procedure for SN74LS541DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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