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Texas Instruments SN74LS541NE4
- Part No.:
- SN74LS541NE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74LS541NE4.pdf
- Description:
- 8-CH, 4.75-V TO 5.25-V BIPOLAR B
- Quantity:
- Payment:
- Shipping:
Inventory:1,883
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Product details
Overview
SN74LS541NE4 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), 26 mA sink / 15 mA source output drive capability, 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 SN74LS541NE4 datasheet, SN74LS541NE4 pinout, SN74LS541NE4 application, or SN74LS541NE4 equivalent, this page delivers verified electrical parameters, validated PDIP-20 pin mapping, real-world use cases in legacy industrial control and instrumentation, and two confirmed functional alternatives with documented differences in output drive strength and temperature range.
Technical Context
The SN74LS541NE4 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 to achieve propagation delays of 15 ns (typical) at VCC = 5 V and CL = 15 pF. Input thresholds are defined per TTL standards: VIH ≥ 2.0 V, VIL ≤ 0.8 V, ensuring robust noise immunity in mixed-signal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS (Low-power Schottky TTL) - ensures backward compatibility with legacy 74-series designs and predictable timing margins. |
| Function | Octal non-inverting 3-state buffer - provides unidirectional signal buffering with bus contention prevention via OE control. |
| Supply Voltage | 4.75 V to 5.25 V - requires tightly regulated +5 V rail; not tolerant of wider voltage ranges like CMOS variants. |
| Output Drive | IOH = –15 mA / IOL = 26 mA at VCC = 5 V - sufficient to drive 10 standard LS-TTL loads or one Schottky TTL load. |
| Propagation Delay | 15 ns (max) tPLH/tPHL at VCC = 5 V, CL = 15 pF - defines maximum clock/data rate for synchronous bus applications up to ~33 MHz. |
| Operating Temperature | 0°C to +70°C - commercial-grade rating; not suitable for extended industrial or military environments without derating. |
| Input Thresholds | VIH = 2.0 V (min), VIL = 0.8 V (max) - matches standard TTL interface levels, eliminating need for level-shifting with legacy peripherals. |
Pinout & Package
SN74LS541NE4 is supplied in a 20-pin Plastic Dual In-line Package (PDIP-N), 0.300-inch wide body, with 0.100-inch lead pitch. The package is RoHS-compliant with NiPdAu lead finish and rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low Output Enable | Drives all eight outputs into high-impedance state when HIGH; enables normal buffering when LOW. |
| 2–9 (A1–A8) | Inputs | Eight buffered data inputs; TTL-compatible voltage thresholds ensure reliable logic-level recognition. |
| 11–18 (Y1–Y8) | Outputs | Non-inverting 3-state outputs; each capable of sinking 26 mA or sourcing 15 mA under load. |
| 10 (GND) | Ground Reference | Primary power return path; must be low-impedance connection to minimize ground bounce in high-speed switching. |
| 20 (VCC) | Positive Supply | +5 V DC supply; requires local 0.1 µF ceramic decoupling capacitor placed within 10 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Outputs | Single active-low OE pin controls all eight outputs simultaneously, enabling clean bus arbitration in multi-driver systems. |
| TTL-Compatible Inputs | Meets standard 74LS input voltage thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), eliminating external level translation in legacy designs. |
| High Sink Current | 26 mA output sink capability supports direct driving of LEDs, relays, or multiple LS-TTL inputs without external buffers. |
| Low Propagation Delay | 15 ns typical delay allows integration into 20–30 MHz synchronous bus architectures with margin for setup/hold timing. |
| PDIP-20 Package | Through-hole mounting with 0.300-inch width supports prototyping, repairability, and long-term availability in industrial maintenance contexts. |
Applications
| Industrial PLC Backplane Interface | Legacy Microprocessor Address Bus Isolation |
|---|---|
|
Use Scenario: Isolating CPU address lines from peripheral modules on a DIN-rail mounted programmable logic controller backplane. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-state control prevents address bus contention during module hot-swap or diagnostic mode. Use Value: Enables deterministic bus arbitration using OE signal synchronized to CPU READY handshake, reducing system lockup risk in field-deployed controllers. |
Use Scenario: Driving Z80 or 8085 microprocessor address bus segments to separate memory banks and I/O decoders. IC Role / Device Role / Timing Role: Octal buffer isolates CPU address outputs from capacitive loading of long PCB traces and multiple decoder inputs. Use Value: Maintains address setup/hold timing integrity across 150 mm trace lengths by limiting fanout to ≤10 LS loads per line. |
| Test Equipment Digital I/O Expansion | Automated Test Fixture Signal Conditioning |
|
Use Scenario: Adding parallel digital I/O channels to benchtop logic analyzers or boundary-scan test adapters. IC Role / Device Role / Timing Role: Bidirectional bus driver configured as unidirectional output expander controlled by FPGA GPIO. Use Value: Provides 8 additional 5 V-tolerant outputs with 26 mA drive-sufficient to directly activate optocoupler inputs or relay drivers without discrete transistors. |
Use Scenario: Level-shifting and buffering between 3.3 V FPGA I/O and 5 V legacy instrumentation front-end circuitry. IC Role / Device Role / Timing Role: TTL-input buffer accepts 3.3 V logic-high signals (VIH = 2.0 V min) while delivering full 5 V swing to downstream analog multiplexers. Use Value: Eliminates need for dedicated level translators by leveraging inherent TTL input threshold margin, reducing BOM count and layout area. |
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 | Two independent 4-bit 3-state buffers with separate OE controls per group; identical drive strength and timing. | Supports split-bus architectures where A/B groups require independent enable control; not drop-in for single-OE designs. | Select SN74LS241N only if dual-OE functionality is required; otherwise SN74LS541NE4 offers simpler control and lower gate count. |
| SN74HC244N | CMOS family (74HC); higher VIH (3.15 V min), lower IOL (4 mA), wider VCC range (2–6 V), and 20 ns max propagation delay. | Suitable for mixed-voltage systems but cannot directly replace SN74LS541NE4 in legacy 5 V-only TTL buses due to reduced drive and input threshold mismatch. | Choose SN74HC244N for new low-power designs with 3.3/5 V flexibility; avoid in existing LS-TTL systems requiring 26 mA sink capability. |
Compared with SN74LS241N and SN74HC244N, SN74LS541NE4 uniquely delivers single-OE simplicity, full LS-TTL drive strength, and guaranteed timing compatibility with 1980s–1990s microprocessor platforms-making it irreplaceable in maintenance and obsolescence-sensitive industrial retrofits.
Availability
SN74LS541NE4 is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, legacy microprocessor address bus isolation, and automated test fixture signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for SN74LS541NE4 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 and automotive reach.
SN74LS541NE4 belongs to TI's legacy 74LS logic family, engineered specifically for reliability and interoperability in fixed-function digital systems deployed in factory automation, test equipment, and military-grade avionics subsystems.
FAQ
What is the function of the OE pin on the SN74LS541NE4?
The OE (Output Enable) pin on the SN74LS541NE4 is an active-low control input that places all eight outputs into a high-impedance state when driven HIGH. When OE is LOW, the device operates as a non-inverting octal buffer. This behavior allows SN74LS541NE4 to share data buses safely with other drivers without contention, making it essential for bidirectional bus architectures in microprocessor systems.
Can SN74LS541NE4 operate with a 3.3 V supply?
No, SN74LS541NE4 is strictly a 5 V TTL device and requires a supply voltage between 4.75 V and 5.25 V. Applying 3.3 V will result in undefined logic states, degraded noise margins, and failure to meet output drive specifications. For 3.3 V systems, consider CMOS alternatives such as SN74LVC244A, but note that these are not pin- or functionally compatible replacements for SN74LS541NE4.
What is the maximum capacitive load SN74LS541NE4 can drive reliably?
SN74LS541NE4 is characterized to drive up to 15 pF load capacitance with guaranteed 15 ns propagation delay. While it can physically drive higher capacitance (e.g., >50 pF), timing margins degrade significantly beyond 15 pF, increasing skew and risk of setup/hold violations in synchronous systems. For loads exceeding 15 pF, add series termination or reduce trace length to maintain signal integrity in SN74LS541NE4 applications.
Is SN74LS541NE4 RoHS compliant?
Yes, SN74LS541NE4 is RoHS compliant with NiPdAu (nickel-palladium-gold) lead finish. It meets EU Directive 2011/65/EU requirements and contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE). The "E4" suffix explicitly denotes TI's RoHS-compliant PDIP packaging variant.
How does SN74LS541NE4 differ from SN74LS540NE4?
SN74LS541NE4 provides non-inverting outputs, while SN74LS540NE4 provides inverting outputs. Both share identical pinout, 3-state control (active-low OE), drive strength, timing, and package. The functional difference is polarity: SN74LS541NE4 preserves input logic state at its outputs, whereas SN74LS540NE4 complements it. Selection depends solely on whether system-level logic requires inversion-no electrical or mechanical distinction exists beyond output phase.
SN74LS541NE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- Schmitt Trigger
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74LS541NE4 FAQ
1.How can I place an order for SN74LS541NE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS541NE4 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 SN74LS541NE4 reliable?
The price and inventory of SN74LS541NE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS541NE4 is usually 5 days.
3.What payment methods are accepted for SN74LS541NE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS541NE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS541NE4?
SN74LS541NE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS541NE4 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 SN74LS541NE4?
For technical support, including SN74LS541NE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS541NE4 requirements.
6.How does Aetrix verify that SN74LS541NE4 is sourced from the original manufacturer or authorized distributors?
All SN74LS541NE4 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 SN74LS541NE4 meets industry standards.
7.What is the process for return or replacement of SN74LS541NE4?
All SN74LS541NE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS541NE4, 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 SN74LS541NE4 part is unused and in its original packaging.
Return procedure for SN74LS541NE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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