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Texas Instruments SN74ALS541-1N
- Part No.:
- SN74ALS541-1N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ALS541-1N.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:749
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Product details
Overview
SN74ALS541-1N 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 SN74ALS541-1N datasheet, SN74ALS541-1N pinout, SN74ALS541-1N application, or SN74ALS541-1N equivalent, this device is selected for high-drive 3-state bus buffering where pnp-input logic reduces DC loading, data flowthrough pinout simplifies PCB layout, and robust ALS-family timing meets legacy industrial control and instrumentation timing budgets.
Technical Context
The SN74ALS541-1N implements a dual-NOR 3-state control gate: either OE1 or OE2 high forces all eight Y outputs into high-impedance state. Its pnp input structure lowers input current draw versus standard TTL, improving fanout in dense logic systems.
It belongs to the ALS (Advanced Low-Power Schottky) family, offering improved speed-power tradeoffs over LS logic - propagation delays as low as 2 ns (tPHL) and 4 ns (tPLH) at VCC = 5 V, with guaranteed 48 mA IOL only under –1 specification and 4.75–5.25 V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - enables higher speed than LS with lower power than AS, suitable for legacy 5 V systems. |
| Output Type | 3-state (tri-state) - allows bidirectional bus sharing without external isolation; enabled by OE1 or OE2 high. |
| IOL (max) | 48 mA - supports driving heavy capacitive loads or multiple TTL inputs without external buffers. |
| tPLH / tPHL | 4 ns / 2 ns - ensures fast signal propagation for address/data latching in microprocessor peripheral interfaces. |
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5 V regulated supplies; –1 version requires 4.75–5.25 V for full 48 mA rating. |
| Operating Temp | 0°C to 70°C - rated for commercial-grade industrial equipment and embedded control applications. |
| Input Structure | pnp-based - reduces input current (IIL ≤ –0.2 mA), lowering DC loading on preceding drivers and improving system fanout. |
Pinout & Package
SN74ALS541-1N is packaged in a 20-pin plastic dual in-line package (PDIP-N), 7.62 mm pitch, 24.4 mm body length, with standard through-hole mounting and RoHS-compliant NiPdAu lead finish.
| 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 upstream logic. |
| 9 | GND | Ground reference for all internal circuitry and output stage return path. |
| 10 | VCC | Positive supply (4.5–5.5 V); decoupling capacitor required near pin for noise immunity. |
| 11, 19 | OE1, OE2 | Active-low 3-state enable inputs; NOR logic - either high disables all outputs. |
| 12, 13, 14, 15, 16, 17, 18, 20 | Y1–Y8 Outputs | True buffered outputs; each capable of sourcing –12 mA or sinking 48 mA (–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 reduces trace crosstalk in bus routing. |
| Dual 3-State Enable Logic | OE1 and OE2 form a 2-input NOR gate - enables flexible bus arbitration using either signal alone or combined logic. |
| ALS Family Performance | Combines 2–4 ns propagation delays with 13.5–32 mA ICC (disabled), achieving superior speed/power vs. standard LS logic. |
| pnp Input Stage | Reduces input current to ≤ –0.2 mA (IIL), increasing effective fanout and easing drive requirements from preceding gates. |
| –1 Version Output Drive | Guaranteed 48 mA sink capability (IOL) under tight VCC (4.75–5.25 V) - supports direct connection to multiple TTL loads or resistive terminations. |
Applications
| Memory Address Buffering | Parallel Bus Isolation |
|---|---|
Use Scenario: Buffering 8-bit address lines between microprocessor and memory ICs in legacy industrial controllers. IC Role / Device Role / Timing Role: Acts as unidirectional address latch buffer with 3-state control synchronized to memory read/write strobes. Use Value: Prevents address bus contention during DMA cycles; 48 mA drive ensures clean edges into 100+ pF memory address capacitance. |
Use Scenario: Isolating two 8-bit data buses sharing a common backplane in modular test equipment. IC Role / Device Role / Timing Role: Provides bidirectional bus separation via OE-controlled 3-state outputs, enabling time-multiplexed bus access. Use Value: Eliminates need for discrete bus switches; data flowthrough pinout allows straight-layer PCB routing with minimal stubs. |
| Legacy System Upgrades | Industrial I/O Expansion |
Use Scenario: Replacing obsolete SN74LS244 in aging PLC backplanes requiring higher drive strength. IC Role / Device Role / Timing Role: Drop-in functional replacement with identical pinout and true-output logic, but enhanced ALS performance. Use Value: Maintains compatibility while improving timing margin (2 ns faster tPHL) and reducing board-level power dissipation. |
Use Scenario: Driving 8-channel LED indicators or relay coils from microcontroller GPIO in factory HMIs. IC Role / Device Role / Timing Role: Serves as high-current output interface, translating logic-level signals to 20–48 mA load drive. Use Value: Direct coil/LED drive without external transistors; pnp inputs reduce loading on weak MCU outputs. |
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 | No –1 suffix; rated for 24 mA IOL (not 48 mA) across full 4.5–5.5 V range. | Suitable for lighter bus loads or systems where 48 mA is not required. | Select SN74ALS541N if design operates outside 4.75–5.25 V or does not require maximum sink drive. |
| SN74LS244N | LS family; slower (tPHL up to 15 ns), lower IOL (24 mA), no –1 variant, higher ICC (up to 60 mA disabled). | Compatible with older designs using LS logic; lacks ALS speed and efficiency. | Choose SN74LS244N only for strict LS-family interoperability or cost-sensitive legacy replacements. |
Compared with SN74ALS541N and SN74LS244N, the SN74ALS541-1N delivers 100% higher sink current at same voltage, 3× faster propagation, and 40% lower quiescent power - making it optimal for timing-critical, high-drive 5 V bus applications where ALS compatibility is acceptable.
Availability
SN74ALS541-1N is available at Aetrix Electronics and suitable for memory subsystem buffering, parallel bus isolation, legacy system upgrades, and industrial I/O expansion requiring stable component supply and long-term industrial temperature support.
Supply support for SN74ALS541-1N 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 with broad industrial, automotive, and communications reach.
The SN74ALS541-1N belongs to TI's legacy ALS logic portfolio, engineered for high-speed, low-power 5 V digital interfacing in industrial control, instrumentation, and computer peripheral systems.
FAQ
What is the key functional difference between SN74ALS541-1N and SN74ALS541N?
The SN74ALS541-1N is rated for 48 mA low-level output current (IOL) when VCC is maintained between 4.75 V and 5.25 V, whereas the standard SN74ALS541N is rated for only 24 mA across the full 4.5–5.5 V range. This makes SN74ALS541-1N suitable for heavier capacitive or multi-load bus driving where extra sink strength is required. Both share identical pinout, logic function, and 3-state control architecture.
Does SN74ALS541-1N support inverted output functionality?
No. The SN74ALS541-1N provides true (non-inverted) outputs - Yn = An. For inverted outputs, TI offers the pin-compatible SN74ALS540-1N, which performs Yn = NOT(An). Both devices share identical 3-state control, package, and electrical specifications except for output polarity and part marking.
What is the significance of the "pnp inputs" mentioned in the SN74ALS541-1N datasheet?
The pnp input structure reduces input current draw: IIL is specified at ≤ –0.2 mA (vs. –1.6 mA typical for standard TTL), significantly lowering DC loading on upstream drivers. This improves fanout capability and eases drive requirements in dense logic systems - a key advantage of the ALS family over LS or standard TTL.
Can SN74ALS541-1N be used in place of SN74LS244 in existing designs?
Yes - SN74ALS541-1N is functionally and pin-compatible with SN74LS244, providing true outputs and identical 20-pin PDIP layout. However, due to its ALS characteristics (faster timing, lower ICC, pnp inputs), designers must verify timing margins and ensure VCC stability within 4.75–5.25 V to guarantee full 48 mA IOL performance. No PCB changes are required.
What does the dual 3-state enable (OE1/OE2) configuration allow in system design?
The OE1 and OE2 pins form a 2-input NOR gate: either signal high places all eight outputs in high-impedance state. This enables flexible bus arbitration - for example, OE1 can be tied to a CPU write strobe and OE2 to a DMA controller enable, allowing either master to independently disable the buffer and release the bus. It avoids requiring external logic for enable prioritization.
SN74ALS541-1N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74ALS541-1N FAQ
1.How can I place an order for SN74ALS541-1N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS541-1N 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 SN74ALS541-1N reliable?
The price and inventory of SN74ALS541-1N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS541-1N is usually 5 days.
3.What payment methods are accepted for SN74ALS541-1N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS541-1N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS541-1N?
SN74ALS541-1N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS541-1N 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 SN74ALS541-1N?
For technical support, including SN74ALS541-1N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS541-1N requirements.
6.How does Aetrix verify that SN74ALS541-1N is sourced from the original manufacturer or authorized distributors?
All SN74ALS541-1N 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 SN74ALS541-1N meets industry standards.
7.What is the process for return or replacement of SN74ALS541-1N?
All SN74ALS541-1N units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS541-1N, 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 SN74ALS541-1N part is unused and in its original packaging.
Return procedure for SN74ALS541-1N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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