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Texas Instruments SN74ALS541NS
- Part No.:
- SN74ALS541NS
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS541NS.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,334
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Product details
Overview
SN74ALS541NS from Texas Instruments is an octal buffer/line driver with 3-state outputs, designed for bus interfacing and memory address register buffering in TTL-compatible digital systems. It features true (non-inverting) data flow, dual 3-state enable inputs (OE1/OE2), pnp input structure for reduced DC loading, and operates at 4.5–5.5 V supply voltage with 12 mA low-level output drive.
For engineers reviewing the SN74ALS541NS datasheet, SN74ALS541NS pinout, SN74ALS541NS application, or SN74ALS541NS equivalent, this device supports high-density PCB layout via its data flowthrough pinout (inputs on one side, outputs on the opposite), delivers guaranteed 12 mA sink capability at VCC = 4.5 V, meets ALS logic family timing specs (tPLH ≤ 14 ns), and enables bus isolation in industrial control and legacy computing subsystems.
Technical Context
The SN74ALS541NS implements a dual-NOR gate 3-state control architecture: either OE1 or OE2 high forces all eight Y outputs into high-impedance state. Its pnp input stage reduces input current loading compared to standard TTL, improving fanout in backplane or board-level interconnects.
It belongs to the 74ALS logic family and shares electrical compatibility with SN74ALS240A but uses a split-side pinout-inputs (A1–A8, OE1, OE2) on left, outputs (Y1–Y8), VCC, and GND on right-enabling simplified trace routing and minimizing crosstalk in parallel bus designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - Ensures stable operation across standard 5 V rail tolerances in industrial and computing environments. |
| Output Drive (IOL) | 12 mA (min) at VCC = 4.5 V - Sufficient to drive multiple TTL loads or terminated transmission lines without external buffers. |
| Propagation Delay (tPLH/tPHL) | 4–14 ns - Enables reliable operation in 20+ MHz bus systems with tight setup/hold timing margins. |
| 3-State Enable Logic | NOR-gated OE1/OE2 - Single-pin disable possible; OR-style active-low control simplifies system-level bus arbitration logic. |
| Input Structure | pnp-based - Reduces input current to ≤ –0.2 mA (IIL), lowering power consumption and easing driving requirements from upstream logic. |
| Thermal Impedance (θJA) | 60°C/W (NS package) - Supports continuous operation up to 70°C ambient without forced cooling in enclosed enclosures. |
Pinout & Package
SN74ALS541NS is housed in a 20-pin SOP (Small Outline Package) with NS suffix, measuring 7.5 mm × 5.3 mm × 2.0 mm (max height), RoHS-compliant NIPDAU lead finish, and moisture sensitivity level (MSL) 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | True (non-inverted) data inputs; pnp structure minimizes DC loading on source drivers. |
| 9 | GND | Ground reference for all internal logic and output stages; must be low-impedance connection. |
| 10 | VCC | +5 V supply; decoupling capacitor (0.1 µF) required within 10 mm of this pin. |
| 11, 19 | OE1, OE2 | Active-low 3-state enable inputs; NOR logic means either high disables all outputs. |
| 12, 13, 14, 15, 16, 17, 18, 20 | Y1–Y8 Outputs | True-buffered, 3-state outputs; high-impedance when enabled off, capable of sinking 12 mA minimum. |
Key Features
| Feature | Design Value |
|---|---|
| Data flowthrough pinout | Inputs (A1–A8, OE1/OE2) on left side, outputs (Y1–Y8) on right - eliminates layer jumps and reduces signal skew in dense bus layouts. |
| pnp input stage | Reduces IIL to –0.2 mA max - increases effective fanout by ~3× vs. standard TTL, reducing need for input buffers. |
| Dual 3-state enable | OE1 and OE2 form a NOR gate - allows flexible bus control: single-enable mode or redundant enable for fault-tolerant systems. |
| ALS family compatibility | Meets SN74ALS240A timing and drive specs - drop-in replacement where pinout permits, with improved layout efficiency. |
Applications
| Industrial PLC Backplane Interface | Legacy Memory Address Buffering |
|---|---|
Use Scenario: Isolating and driving 8-bit address lines between microcontroller and EPROM/RAM modules in programmable logic controllers. IC Role / Device Role / Timing Role: Non-inverting octal buffer with 3-state control synchronizes with CPU address strobes to prevent bus contention during memory access cycles. Use Value: Guaranteed tPLH ≤ 14 ns ensures address setup time compliance with 20 MHz Z80 or 8085 derivatives; 12 mA drive sustains signal integrity over 15 cm PCB traces. |
Use Scenario: Buffering 8-bit I/O port addresses in retrocomputing restoration projects using original 1980s-era hardware. IC Role / Device Role / Timing Role: True-data octal driver interfaces between TTL-compatible peripheral controllers and address decoders in vintage computer motherboards. Use Value: pnp input structure matches vintage TTL loading profiles; NS package footprint fits legacy PCBs while enabling modern rework compatibility. |
| Test Equipment Digital Bus Driver | Automated Test Fixture Signal Conditioning |
Use Scenario: Driving DUT (device under test) address/data buses in automated boundary-scan or functional test systems. IC Role / Device Role / Timing Role: 3-state-enabled octal buffer provides controlled signal injection and isolation during test vector execution and response capture phases. Use Value: Dual OE inputs allow synchronized enable/disable across multiple SN74ALS541NS devices; tPZL ≤ 20 ns ensures fast bus release for high-throughput test sequencing. |
Use Scenario: Level-shifting and fanout expansion for control signals in modular test fixtures with mixed-voltage subassemblies. IC Role / Device Role / Timing Role: True-buffered line driver conditions GPIO outputs from microcontrollers before distribution to relay banks, LED indicators, and sensor interfaces. Use Value: 60°C/W θJA enables stable operation inside sealed test enclosures; 4.5–5.5 V VCC range accommodates aging power supplies with ±10% regulation drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS541N | Same logic function and timing, but in 20-pin PDIP (N) package - larger footprint, through-hole mounting. | Preferred for prototyping, manual assembly, or legacy repair where SOP rework is impractical. | Select SN74ALS541N when hand-soldering or socket-based design is required; SN74ALS541NS offers higher density and automated assembly compatibility. |
| SN74LS241N | LS-family octal buffer with 3-state outputs; slower (tPLH ≤ 25 ns), lower drive (IOL = 8 mA), no pnp inputs. | Suitable for cost-sensitive, lower-speed systems where ALS performance margin is unnecessary. | Choose SN74LS241N only if timing budget allows ≥25 ns delays and drive requirement is ≤8 mA; SN74ALS541NS delivers superior speed and noise immunity. |
Compared with SN74ALS541N and SN74LS241N, the SN74ALS541NS provides optimal balance of high-speed ALS performance, compact surface-mount packaging, and proven reliability in industrial bus interface roles - making it the preferred choice for new designs requiring both density and legacy TTL compatibility.
Availability
SN74ALS541NS is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy memory subsystems, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for SN74ALS541NS 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS541NS belongs to TI's 74ALS advanced low-power Schottky logic family, engineered for high-speed, low-noise digital interfacing in mission-critical industrial and computing applications where reliability and timing precision are essential.
FAQ
What is the maximum operating temperature for the SN74ALS541NS?
The SN74ALS541NS is rated for operation from 0°C to +70°C ambient temperature. This commercial-grade specification aligns with its SOP (NS) package construction and makes it suitable for indoor industrial control panels, test equipment, and computing peripherals where environmental conditions are managed. Exceeding 70°C may cause parametric shift or accelerated wear.
Does the SN74ALS541NS support inverted output functionality?
No, the SN74ALS541NS provides true (non-inverting) data outputs only. The inverted-output variant is the SN74ALS540NS. Both share identical pinout, timing, and drive specifications, differing solely in output polarity - confirming that SN74ALS541NS must be selected when signal inversion is not required in the bus path.
Can SN74ALS541NS replace SN74ALS240A in existing designs?
Functionally yes - SN74ALS541NS matches SN74ALS240A's timing, drive strength, and logic behavior - but pinout differs: SN74ALS541NS places all inputs on one side and outputs on the other, whereas SN74ALS240A interleaves them. Direct replacement requires PCB layout revision; however, the SN74ALS541NS offers superior routing efficiency in new designs.
What is the recommended decoupling for SN74ALS541NS?
A 0.1 µF ceramic capacitor placed within 10 mm of the VCC (pin 10) and GND (pin 9) pins is mandatory for stable operation. For systems with multiple SN74ALS541NS devices or high switching activity, add a bulk 4.7 µF tantalum or aluminum electrolytic capacitor per 5–10 ICs on the same 5 V rail to suppress low-frequency supply droop.
Is SN74ALS541NS compatible with 3.3 V logic systems?
No - SN74ALS541NS is strictly a 5 V TTL-family device with VCC min = 4.5 V. Its inputs require VIH ≥ 2.0 V and VIL ≤ 0.8 V, and outputs swing from 0.25 V (low) to ≥2.4 V (high) at 5 V. Interfacing with 3.3 V systems requires level translation; direct connection risks undriven inputs or excessive current into 3.3 V outputs.
SN74ALS541NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74ALS541NS FAQ
1.How can I place an order for SN74ALS541NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS541NS 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 SN74ALS541NS reliable?
The price and inventory of SN74ALS541NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS541NS is usually 5 days.
3.What payment methods are accepted for SN74ALS541NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS541NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS541NS?
SN74ALS541NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS541NS 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 SN74ALS541NS?
For technical support, including SN74ALS541NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS541NS requirements.
6.How does Aetrix verify that SN74ALS541NS is sourced from the original manufacturer or authorized distributors?
All SN74ALS541NS 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 SN74ALS541NS meets industry standards.
7.What is the process for return or replacement of SN74ALS541NS?
All SN74ALS541NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS541NS, 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 SN74ALS541NS part is unused and in its original packaging.
Return procedure for SN74ALS541NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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