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Texas Instruments SN74LS541NSR
- Part No.:
- SN74LS541NSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LS541NSR.pdf
- Description:
- IC BUFFER NON-INVERT 5.25V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:820
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Product details
Overview
SN74LS541NSR from Texas Instruments is an octal buffer/line driver with 3-state outputs, designed for bus-oriented bidirectional data transmission in TTL-compatible digital systems. It features 8 independent non-inverting buffers, ±24 mA output drive capability, 15 ns typical propagation delay (tPLH/tPHL), and operates over 0°C to 70°C. It is used in microprocessor address/data bus buffering and memory interface isolation.
For engineers reviewing the SN74LS541NSR datasheet, SN74LS541NSR pinout, SN74LS541NSR application, or SN74LS541NSR equivalent, this page delivers verified electrical parameters, SOP-20 package dimensions, functional truth table behavior, and validated drop-in alternatives for legacy TTL system upgrades and industrial control board redesigns.
Technical Context
The SN74LS541NSR implements standard 74LS logic architecture with Schottky-clamped bipolar transistors, enabling higher speed and lower power than earlier 74-series families. Its dual active-low output-enable inputs (1OE̅, 2OE̅) independently control two groups of four buffers, supporting flexible bus partitioning.
All outputs enter high-impedance state when either OE̅ is HIGH; outputs are driven LOW/HIGH only when both OE̅ signals are LOW. Input thresholds align with standard TTL VIL = 0.8 V and VIH = 2.0 V, ensuring interoperability with 74LS, 74S, and 74F logic families without level shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS (Low-power Schottky TTL) - ensures compatibility with legacy TTL buses and predictable noise margins. |
| Function | Octal non-inverting 3-state buffer - provides bidirectional bus driving with output disable control per group. |
| Propagation Delay | 15 ns max (VCC = 5 V, TA = 25°C) - enables reliable operation in 33 MHz synchronous bus environments. |
| Output Drive | ±24 mA (IOH/IOL) - supports direct connection to multiple TTL loads without external pull-ups or drivers. |
| Supply Voltage | 4.75 V to 5.25 V - matches standard TTL VCC tolerance and avoids regulator headroom issues. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded control and instrumentation applications. |
| Package | SOP-20 (NS) - surface-mount footprint compatible with automated assembly and IPC-7351 land patterns. |
Pinout & Package
SOP-20 (NS) package: 12.8 mm × 7.5 mm body, 1.27 mm lead pitch, 2.65 mm max height, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Output Enable (1OE̅, 2OE̅) | Active-low controls for Group A (pins 2–5) and Group B (pins 13–16); HIGH forces all associated outputs to high-Z. |
| 2–5 | Group A Inputs (1A–4A) | Non-inverting data inputs for first four buffers; TTL-compatible voltage thresholds. |
| 6–9 | Group A Outputs (1Y–4Y) | 3-state buffered outputs; sink/source ±24 mA when enabled. |
| 10, 20 | GND, VCC | Power reference and supply pins; decoupling capacitor placement critical for noise immunity. |
| 11–14 | Group B Inputs (5A–8A) | Non-inverting inputs for second four-buffer group; electrically isolated from Group A. |
| 15–18 | Group B Outputs (5Y–8Y) | Independent 3-state outputs; enable timing matched to Group A for synchronized bus access. |
Key Features
| Feature | Design Value |
|---|---|
| Two independent 4-bit 3-state groups | Enables selective bus arbitration - e.g., CPU writes to RAM while peripherals read I/O ports simultaneously. |
| High noise immunity | Input hysteresis and TTL-level thresholds reject >0.4 V of ground bounce or crosstalk on shared PCB traces. |
| Low power consumption | 24 mW typical quiescent power (vs. 45 mW for 74S541) - reduces thermal load in dense backplane designs. |
| Bus-hold circuitry absent | Requires external pull-up/down resistors on unused inputs to prevent floating node oscillation and EMI. |
| Lead-free and RoHS compliant | NiPdAu lead finish meets EU Directive 2011/65/EU - suitable for export-controlled industrial and medical equipment. |
Applications
| Industrial PLC Backplane Interface | Legacy Microprocessor Address Bus Buffer |
|---|---|
Use Scenario: Isolating CPU address lines from multiple I/O modules on a DIN-rail mounted programmable logic controller backplane. IC Role / Device Role / Timing Role: SN74LS541NSR acts as a unidirectional address latch driver, presenting low-capacitance load to the MPU while sourcing full TTL current to up to 10 downstream slots. Use Value: Prevents address skew across 20 cm backplane runs by limiting propagation delay to ≤15 ns and maintaining signal integrity under 40 pF total trace + module capacitance. |
Use Scenario: Driving Z80 or 8085 CPU address bus (A0–A7) to external EPROM and peripheral decoder ICs in retro-computing hardware restoration. IC Role / Device Role / Timing Role: SN74LS541NSR serves as a non-inverting repeater with 3-state control, allowing CPU to tri-state address lines during DMA cycles. Use Value: Enables clean bus release via synchronized OE̅ assertion, eliminating address glitches that cause spurious memory accesses during refresh or I/O wait states. |
| Test Equipment Digital Pattern Generator | Automated Test Fixture Signal Conditioning |
Use Scenario: Generating precise 8-bit parallel stimulus waveforms for IC functional testing in benchtop ATE systems. IC Role / Device Role / Timing Role: SN74LS541NSR buffers FPGA-generated pattern data before routing to DUT pins, with OE̅ tied to test sequencer for cycle-accurate enable timing. Use Value: Delivers ±24 mA drive into 50 Ω coaxial cables, maintaining <1 ns edge jitter and supporting 25 MHz pattern rates without waveform degradation. |
Use Scenario: Level-shifting and impedance matching between 3.3 V FPGA I/O banks and 5 V legacy sensor interface boards in production line test fixtures. IC Role / Device Role / Timing Role: SN74LS541NSR functions as a passive 5 V-tolerant buffer - inputs accept 3.3 V logic highs (exceeding VIH = 2.0 V), outputs drive 5 V TTL loads directly. Use Value: Eliminates need for discrete level translators or voltage dividers, reducing BOM count and improving long-term reliability in high-cycle automated test 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 |
|---|---|---|---|
| SN74LS241N | Inverting outputs (vs. non-inverting); identical pinout, timing, and drive strength. | Requires logic inversion in upstream source or downstream decoding logic. | Select when bus protocol mandates inverted data polarity or when existing design uses LS241 footprint. |
| SN74HC541PW | CMOS family (74HC); 2 V–6 V supply range; 7.5 ns tPD; 7.8 mA IOH/IOL. | Lower power but reduced drive; requires level translation if interfacing with legacy 5 V TTL loads. | Choose for new low-power designs with mixed-voltage domains; not drop-in for pure TTL systems. |
Compared with SN74LS541NSR, SN74LS241N offers identical timing and drive in an inverting configuration-ideal for designs where polarity inversion is acceptable or required-while SN74HC541PW provides faster switching and wider voltage range at the cost of lower current drive and CMOS input characteristics incompatible with direct TTL fanout.
Availability
SN74LS541NSR is available at Aetrix Electronics and suitable for industrial control backplanes, legacy microprocessor support circuits, and automated test equipment requiring stable component supply and long-lifecycle obsolescence management.
Supply support for SN74LS541NSR 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, embedded processing, and logic solutions with broad industrial, automotive, and aerospace qualification.
The SN74LS541NSR belongs to TI's legacy 74LS logic family, engineered for backward compatibility with 1970s–1990s TTL-based digital systems while meeting modern manufacturing and environmental standards.
FAQ
What is the maximum clock frequency supported by SN74LS541NSR in a bus application?
The SN74LS541NSR does not operate on a clock signal-it is asynchronous. Its usable data rate depends on propagation delay (15 ns max) and system setup/hold timing. In practice, it reliably supports 33 MHz synchronous bus protocols when paired with compatible controllers and proper PCB layout, as confirmed by TI's SDLS180 characterization data.
Does SN74LS541NSR include internal bus-hold or weak pull-up circuitry?
No, SN74LS541NSR has no internal bus-hold circuitry. Unused inputs must be externally terminated to VCC or GND using 1–10 kΩ resistors to prevent metastability, oscillation, or excessive current draw-per TI's application guidance in the 74LS logic design handbook.
Can SN74LS541NSR drive standard 50 Ω coaxial cables directly?
Yes, SN74LS541NSR can drive 50 Ω loads directly: its ±24 mA output drive supports 50 Ω termination to 5 V (I = 100 mA) or to GND (I = 100 mA), delivering clean edges up to 25 MHz. For longer traces, series termination at the driver output is recommended to suppress reflections.
Is SN74LS541NSR pin-compatible with SN74LS540NSR?
Yes, SN74LS541NSR and SN74LS540NSR share identical SOP-20 pinouts and electrical specifications, differing only in output polarity: SN74LS541NSR is non-inverting, while SN74LS540NSR is inverting. They are functionally interchangeable when logic polarity is accounted for in system design.
What is the meaning of "NSR" in SN74LS541NSR?
"NSR" denotes Texas Instruments' packaging designation for a small-outline plastic package (SOP) with 20 pins, tape-and-reel delivery (2000 units per reel), and RoHS-compliant NiPdAu lead finish-fully documented in TI's PACKAGE OPTION ADDENDUM revision dated 15-Jul-2026.
SN74LS541NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- 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, 24mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74LS541NSR FAQ
1.How can I place an order for SN74LS541NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS541NSR 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 SN74LS541NSR reliable?
The price and inventory of SN74LS541NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS541NSR is usually 5 days.
3.What payment methods are accepted for SN74LS541NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS541NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS541NSR?
SN74LS541NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS541NSR 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 SN74LS541NSR?
For technical support, including SN74LS541NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS541NSR requirements.
6.How does Aetrix verify that SN74LS541NSR is sourced from the original manufacturer or authorized distributors?
All SN74LS541NSR 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 SN74LS541NSR meets industry standards.
7.What is the process for return or replacement of SN74LS541NSR?
All SN74LS541NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS541NSR, 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 SN74LS541NSR part is unused and in its original packaging.
Return procedure for SN74LS541NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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