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Texas Instruments SN74ALS541-1NSR
- Part No.:
- SN74ALS541-1NSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS541-1NSR.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,438
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Product details
Overview
SN74ALS541-1NSR from Texas Instruments is an octal buffer and 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 with 5 V supply.
For engineers reviewing the SN74ALS541-1NSR datasheet, SN74ALS541-1NSR pinout, SN74ALS541-1NSR application, or SN74ALS541-1NSR equivalent, this device is selected for high-drive 3-state bus buffering where input/output separation, pnp-input DC loading reduction, and legacy ALS logic timing are required.
Technical Context
The SN74ALS541-1NSR implements a dual-NOR 3-state control gate: either OE1 or OE2 high forces all eight Y outputs into high-impedance state. Its data flowthrough pinout places all eight A inputs on one side and all eight Y outputs on the opposite side - optimizing PCB trace routing for parallel bus architectures.
As an ALS-family device, it delivers improved speed-power trade-offs over standard LS logic: tPLH/tPHL propagation delays range from 2–14 ns at CL = 50 pF, while IOL = 48 mA capability (at VCC = 4.75–5.25 V) enables direct driving of heavier capacitive loads or multiple TTL inputs without external buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Low-Power Schottky (ALS), TTL-compatible voltage thresholds |
| Supply Voltage (VCC) | 4.5 V to 5.5 V - ensures robust operation across industrial 5 V rails |
| Low-Level Output Current (IOL) | 48 mA - supports driving ≥20 standard TTL loads or heavy bus capacitance |
| Propagation Delay (tPLH/tPHL) | 2–14 ns @ CL = 50 pF - enables reliable operation up to ~50 MHz bus toggle rates |
| 3-State Enable Logic | 2-input NOR gate (OE1, OE2) - any high enable disables all outputs simultaneously |
| Input Configuration | pnp-based inputs - reduces DC loading on upstream drivers versus standard TTL |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control systems |
Pinout & Package
SN74ALS541-1NSR is housed in a 20-pin SOP (Small Outline Package) with NS suffix, measuring 7.5 mm × 5.6 mm × 2.0 mm max height. The package uses gull-wing leads, RoHS-compliant NiPdAu finish, and meets JEDEC MS-012 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | True-data inputs; accept TTL-level signals; pnp structure minimizes source current demand |
| 9 | GND | Ground reference for all internal circuitry and output stage return path |
| 10 | VCC | +5 V power supply; decoupling capacitor placement critical for noise immunity |
| 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; capable of sourcing –15 mA / sinking 48 mA |
Key Features
| Feature | Design Value |
|---|---|
| Data flowthrough pinout | Inputs (A1–A8) on left side, outputs (Y1–Y8) on right side - eliminates layer crossover in dense bus layouts |
| pnp input structure | Reduces input current to ≤ –0.2 mA (IIL), lowering loading on preceding drivers and improving fanout |
| Dual 3-state enable (OE1/OE2) | Provides redundant or split-bus control; simplifies system-level bus arbitration logic |
| 48 mA sink capability (–1 version) | Eliminates need for external buffer stages when driving long traces or multiple TTL inputs |
| ALS performance compatibility | Matches timing and drive strength of SN74ALS240A series while offering superior pinout layout efficiency |
Applications
| Memory Address Buffering | Parallel Bus Isolation |
|---|---|
Use Scenario: Buffering 8-bit address lines between microprocessor and SRAM/ROM chips in legacy embedded controllers. IC Role / Device Role / Timing Role: True-direction octal buffer providing level-shifting, load isolation, and timing-controlled 3-state release during memory access cycles. Use Value: Prevents address bus contention during read/write transitions; 48 mA drive ensures fast edge rates across 10+ inch PCB traces. |
Use Scenario: Isolating two 8-bit data buses sharing a common backplane in modular instrumentation systems. IC Role / Device Role / Timing Role: Bidirectional bus driver with independent OE control enabling time-multiplexed bus sharing between CPU and peripheral modules. Use Value: Dual OE inputs allow precise arbitration window control; data flowthrough layout minimizes inter-layer vias and signal skew. |
| Legacy System Upgrades | TTL-Compatible Peripheral Interface |
Use Scenario: Replacing obsolete 74LS244 in industrial PLC I/O modules requiring higher drive strength and lower input loading. IC Role / Device Role / Timing Role: Pin-compatible drop-in upgrade (with board-level validation) delivering 4× higher IOL without changing layout. Use Value: Extends system lifetime by restoring margin in aging designs; pnp inputs reduce stress on aging TTL output stages. |
Use Scenario: Interfacing FPGA GPIO banks to legacy TTL peripherals (e.g., ADCs, DACs, display drivers) in test equipment. IC Role / Device Role / Timing Role: Level-translating buffer ensuring clean 0.8 V/2.0 V TTL thresholds are met despite FPGA's 3.3 V LVTTL outputs. Use Value: Eliminates need for discrete resistor networks or level-shifters; ALS timing guarantees setup/hold compliance with slow peripherals. |
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 | PDIP-20 package; same electrical specs but 24 mA max IOL (non–1 version); no 48 mA rating | Suitable for lower-current bus loads; preferred for through-hole prototyping or legacy repair | Select when cost-sensitive through-hole assembly is required and 48 mA drive is unnecessary |
| SN74ALS541DWR | SOIC-20 tape-and-reel variant; identical –1 spec (48 mA IOL), same timing, same pinout | Designed for automated SMT production; same footprint as NSR but wider body (DW vs NS) | Choose for high-volume SMT lines where DW package handling and reflow profiles are standardized |
Compared with SN74ALS541N, SN74ALS541-1NSR delivers 100% higher sink current for demanding bus loads; compared with SN74ALS541DWR, it offers a narrower 5.3 mm body width (NS vs DW), saving PCB area in space-constrained designs.
Availability
SN74ALS541-1NSR is available at Aetrix Electronics and suitable for memory subsystem buffering, parallel bus isolation, legacy system upgrades, TTL peripheral interfacing, and industrial controller designs requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS541-1NSR 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.
SN74ALS541-1NSR belongs to TI's legacy Advanced Low-Power Schottky (ALS) logic family, engineered for high-speed, low-power TTL-compatible digital interfacing in resource-constrained and reliability-critical systems.
FAQ
What is the maximum output sink current for SN74ALS541-1NSR?
The SN74ALS541-1NSR supports a maximum low-level output current (IOL) of 48 mA when VCC is maintained between 4.75 V and 5.25 V. This rating is exclusive to the "–1" version and is validated per the SDAS025D datasheet. Standard SN74ALS541 variants are rated for 24 mA only. Exceeding 48 mA may cause thermal overstress or parametric shift.
Does SN74ALS541-1NSR provide inverted or non-inverted output logic?
SN74ALS541-1NSR provides true (non-inverted) output logic: Yn = An when enabled. This distinguishes it from the SN74ALS540-1NSR, which delivers inverted outputs (Yn = NOT An). Both share identical pinout, 3-state control, and electrical specifications except for data polarity.
What package type and dimensions does SN74ALS541-1NSR use?
SN74ALS541-1NSR uses a 20-pin SOP (Small Outline Package) with NS designation, per JEDEC MO-153. Its body measures 7.5 mm × 5.6 mm × 2.0 mm max height, with 0.65 mm lead pitch. The package is RoHS-compliant, features NiPdAu lead finish, and carries MSL Level-1 rating for unlimited floor life at ≤30°C/60% RH.
How does the dual 3-state enable (OE1/OE2) function on SN74ALS541-1NSR?
The SN74ALS541-1NSR 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 to activate output drivers. This architecture allows flexible bus arbitration - e.g., OE1 for master control, OE2 for local override - without external logic.
Is SN74ALS541-1NSR compatible with 3.3 V logic systems?
No - SN74ALS541-1NSR is a 5 V-only TTL-compatible device. Its VIH minimum is 2.0 V and VIL maximum is 0.8 V, but it requires VCC = 4.5–5.5 V to meet timing and drive specifications. Direct connection to 3.3 V CMOS outputs risks marginal high-level input recognition; level-shifting or interface logic is required for mixed-voltage systems.
SN74ALS541-1NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- 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, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74ALS541-1NSR FAQ
1.How can I place an order for SN74ALS541-1NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS541-1NSR 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 SN74ALS541-1NSR reliable?
The price and inventory of SN74ALS541-1NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS541-1NSR is usually 5 days.
3.What payment methods are accepted for SN74ALS541-1NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS541-1NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS541-1NSR?
SN74ALS541-1NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS541-1NSR 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 SN74ALS541-1NSR?
For technical support, including SN74ALS541-1NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS541-1NSR requirements.
6.How does Aetrix verify that SN74ALS541-1NSR is sourced from the original manufacturer or authorized distributors?
All SN74ALS541-1NSR 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 SN74ALS541-1NSR meets industry standards.
7.What is the process for return or replacement of SN74ALS541-1NSR?
All SN74ALS541-1NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS541-1NSR, 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 SN74ALS541-1NSR part is unused and in its original packaging.
Return procedure for SN74ALS541-1NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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