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Texas Instruments SN74ALS541-1NS
- Part No.:
- SN74ALS541-1NS
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
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SN74ALS541-1NS.pdf
- Description:
- BUFF/DVR 3-ST OCT 20SO
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Inventory:10,280
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Product details
Overview
SN74ALS541-1NS 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 provides true (non-inverted) data flow, features dual 3-state enable inputs (OE1/OE2), supports 48 mA low-level output current (–1 version), and operates across 0°C to 70°C.
For engineers reviewing the SN74ALS541-1NS datasheet, SN74ALS541-1NS pinout, SN74ALS541-1NS application, or SN74ALS541-1NS equivalent, this device is selected for high-drive 3-state bus driving where input/output separation simplifies PCB layout, pnp input structure reduces DC loading, and data flowthrough pinout enables clean signal routing in memory and control subsystems.
Technical Context
The SN74ALS541-1NS implements a dual-NOR 3-state control gate: either OE1 or OE2 high forces all eight Y outputs into high-impedance. Its pnp input stage lowers input current draw versus standard TTL, improving fanout in dense logic systems.
It belongs to the ALS (Advanced Low-Power Schottky) family, delivering faster propagation delays (tPLH up to 14 ns, tPHL up to 10 ns at VCC = 5 V, CL = 50 pF) and lower power consumption than original LS devices, while maintaining pin compatibility with SN74ALS240A-series layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - balances speed (sub-15 ns propagation) and power efficiency vs. standard LS. |
| Output Type | 3-state (tri-state) - enables shared bus operation without external isolation; disabled outputs present >10 kΩ impedance. |
| IOL (Max) | 48 mA - supports direct driving of heavy capacitive loads or multiple TTL inputs without buffers. |
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5 V digital rails; requires stable regulation within ±5%. |
| Operating Temperature | 0°C to 70°C - commercial-grade rating suitable for industrial control panels and embedded computing chassis. |
| Propagation Delay (tPLH/tPHL) | 4–14 ns / 2–10 ns - ensures timing margins in 25 MHz–40 MHz address/data strobe paths. |
| Input Structure | pnp-based - reduces input current (IIL ≤ –0.2 mA) and eases fanout burden on preceding drivers. |
Pinout & Package
SOP-20 (Small Outline Package, NS suffix), 0.300-inch body width, 0.050-inch lead pitch, 2.0 mm max height. RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | True data inputs; accept TTL-compatible logic levels (VIH ≥ 2 V, VIL ≤ 0.8 V). |
| 9 | GND | Ground reference for all internal circuitry and output current return path. |
| 10, 20 | VCC | Primary 5 V supply; decoupling capacitor (0.1 µF ceramic) required adjacent to Pin 10 or 20. |
| 11, 19 | OE1, OE2 | Active-low 3-state enables; NOR logic - either high disables all Y outputs. |
| 12, 13, 14, 15, 16, 17, 18, 20 | Y1–Y8 Outputs | True-buffered, 3-state outputs; drive buses or registers with 48 mA sink capability (–1 version). |
Key Features
| Feature | Design Value |
|---|---|
| Data Flowthrough Pinout | Inputs (A1–A8) on left side, outputs (Y1–Y8) on right side - eliminates layer crossings and vias in 2-layer PCB designs. |
| Dual 3-State Enable Logic | OE1 and OE2 form a 2-input NOR gate - allows flexible bus arbitration using either enable line independently. |
| Enhanced Output Drive (–1 Version) | 48 mA IOL rating (vs. 24 mA standard) - drives longer traces, higher capacitance, or more TTL loads without degradation. |
| pnp Input Stage | Reduces input current to ≤ –0.2 mA (IIL) - increases effective fanout and lowers loading on upstream logic. |
| ALS Performance Tier | Sub-15 ns propagation with <25 mA ICC (outputs low) - delivers LS speed at near-LS power in legacy 5 V systems. |
Applications
| Memory Address Buffering | Parallel Bus Isolation |
|---|---|
Use Scenario: Driving 16-bit address lines from a microprocessor to multiple memory ICs (SRAM, EPROM) on a shared bus. IC Role / Device Role / Timing Role: True octal buffer with 3-state control synchronizes address latching and prevents contention during DMA cycles. Use Value: 48 mA drive strength ensures full-swing TTL levels across 100+ mm traces; dual OE pins allow independent chip-select gating per memory bank. |
Use Scenario: Isolating CPU data bus from peripheral controllers (UART, parallel port, ADC) in modular backplane systems. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling time-multiplexed access with precise 3-state timing (tPZL ≤ 20 ns). Use Value: Data flowthrough pinout minimizes trace length mismatch; pnp inputs reduce cumulative loading when cascading multiple buffers. |
| Legacy System Upgrade | Industrial Control I/O Expansion |
Use Scenario: Replacing obsolete SN74LS244 in aging PLC backplanes requiring extended drive capability and thermal stability. IC Role / Device Role / Timing Role: Pin-compatible drop-in upgrade delivering faster propagation (14 ns vs. 20 ns) and lower ICC at same VCC. Use Value: ALS process reduces self-heating in densely packed 20-pin DIP/SOP footprints; SOP-20 (NS) enables surface-mount rework without redesign. |
Use Scenario: Buffering discrete I/O signals (limit switches, solenoid drivers, LED indicators) in DIN-rail mounted programmable logic modules. IC Role / Device Role / Timing Role: Octal line driver providing noise-immune 5 V logic translation between microcontroller GPIO and 24 V field-side optocouplers. Use Value: 48 mA sink capability directly drives LEDs or low-side MOSFET gates; 0°C–70°C rating covers industrial ambient ranges. |
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 |
|---|---|---|---|
| SN74ALS541N | Same ALS core, identical logic and pinout, but in PDIP-20 package; IOL rated at 24 mA (non–1 version). | Preferred for through-hole prototyping or legacy repair; lacks enhanced drive for high-capacitance buses. | Select SN74ALS541N only if board uses DIP sockets or system load does not exceed 24 mA per line. |
| SN74ALS541DWR | SOIC-20 (DW) package, same –1 performance (48 mA IOL), identical electrical specs; differs only in footprint and thermal resistance (θJA = 58°C/W vs. NS's 60°C/W). | Better thermal performance and higher density mounting; requires SOIC land pattern instead of SOP. | Choose SN74ALS541DWR when board layout supports SOIC-20 and thermal margin is critical under sustained 48 mA loads. |
Compared with SN74ALS541N, SN74ALS541-1NS offers +100% output drive for demanding bus loads; versus SN74ALS541DWR, it trades marginal thermal advantage for standardized SOP-20 footprint and broader distributor availability in tape-and-reel.
Availability
SN74ALS541-1NS is available at Aetrix Electronics and suitable for memory address buffering, parallel bus isolation, and industrial I/O expansion requiring stable component supply across long-lifecycle embedded programs.
Supply support for SN74ALS541-1NS 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 SN74ALS541-1NS belongs to TI's legacy ALS logic family, engineered for high-speed, low-power 5 V TTL interoperability in memory subsystems and bus-oriented control architectures.
FAQ
What is the maximum output sink current supported by the SN74ALS541-1NS?
The SN74ALS541-1NS supports a guaranteed low-level output current (IOL) of 48 mA per channel when VCC is maintained between 4.75 V and 5.25 V. This rating applies exclusively to the "–1" version and exceeds the 24 mA capability of the standard SN74ALS541. The 48 mA drive enables direct interfacing with heavy capacitive loads or multiple TTL inputs without external amplification. Always verify voltage regulation and local decoupling when operating at maximum IOL.
How does the dual output-enable (OE1/OE2) logic function in the SN74ALS541-1NS?
The SN74ALS541-1NS implements a 2-input NOR gate for 3-state control: if either OE1 or OE2 is driven high, all eight Y outputs enter high-impedance state. Both enables must be low for normal true-data output operation. This architecture allows flexible bus arbitration - for example, OE1 can serve as a master system enable while OE2 responds to peripheral-specific select signals. No external logic is needed to combine enables.
Is the SN74ALS541-1NS pin-compatible with the SN74LS244?
No, the SN74ALS541-1NS is not pin-compatible with the SN74LS244. While both are octal 3-state buffers, the SN74ALS541-1NS uses a data flowthrough pinout (inputs on one side, outputs on the other), whereas the SN74LS244 places inputs and outputs interleaved on the same side. The SN74ALS541-1NS matches the pinout of SN74ALS240A-series devices, not LS244. Board redesign is required for substitution.
What package type and dimensions does the SN74ALS541-1NS use?
The SN74ALS541-1NS uses a SOP-20 (Small Outline Package) with NS suffix: 20-pin, 0.300-inch body width, 0.050-inch lead pitch, and maximum height of 2.0 mm. Its JEDEC MO-150 compliant footprint has 8.4 mm × 13.0 mm cavity dimensions and is optimized for automated SMT assembly. The package carries RoHS-compliant NIPDAU plating and meets MSL Level-1 moisture sensitivity requirements.
Does the SN74ALS541-1NS support inverted or non-inverted data output?
The SN74ALS541-1NS provides true (non-inverted) data output: each Yn output replicates the logic state of its corresponding An input when enabled. This distinguishes it from the SN74ALS540-1NS, which delivers inverted outputs. The '541 variant is selected for applications requiring direct signal pass-through - such as address buffering - where polarity preservation is mandatory for system-level timing and decoding integrity.
SN74ALS541-1NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74ALS541-1NS FAQ
1.How can I place an order for SN74ALS541-1NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS541-1NS 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 SN74ALS541-1NS reliable?
The price and inventory of SN74ALS541-1NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS541-1NS is usually 5 days.
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4.How is shipping managed for SN74ALS541-1NS?
SN74ALS541-1NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS541-1NS 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 SN74ALS541-1NS?
For technical support, including SN74ALS541-1NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS541-1NS requirements.
6.How does Aetrix verify that SN74ALS541-1NS is sourced from the original manufacturer or authorized distributors?
All SN74ALS541-1NS 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 SN74ALS541-1NS meets industry standards.
7.What is the process for return or replacement of SN74ALS541-1NS?
All SN74ALS541-1NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS541-1NS, 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 SN74ALS541-1NS part is unused and in its original packaging.
Return procedure for SN74ALS541-1NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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