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Texas Instruments SN74ALS541-1NG4
- Part No.:
- SN74ALS541-1NG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ALS541-1NG4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,337
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Product details
Overview
SN74ALS541-1NG4 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, supports 48 mA low-level output current (IOL), operates at 4.5–5.5 V, and features pnp input structure to reduce DC loading.
For engineers reviewing the SN74ALS541-1NG4 datasheet, SN74ALS541-1NG4 pinout, SN74ALS541-1NG4 application, or SN74ALS541-1NG4 equivalent, this device is selected for high-drive 3-state bus driving where input/output separation, TTL-level compatibility, and robust sink capability are required in industrial control and legacy computing interfaces.
Technical Context
The SN74ALS541-1NG4 implements a dual 3-state enable architecture using a 2-input NOR gate: either OE1 or OE2 high forces all eight Y outputs into high-impedance. 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 layouts.
It belongs to the ALS (Advanced Low-Power Schottky) logic family, delivering improved speed-power trade-offs over standard LS, with propagation delays as low as 2 ns (tPHL) and 4 ns (tPLH) under loaded conditions (CL = 50 pF). The -1 suffix denotes enhanced IOL rating (48 mA vs. 24 mA in standard versions), validated only at VCC = 4.75–5.25 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL supply rails and tolerant of nominal ±10% variation. |
| IOL (max) | 48 mA - enables direct drive of heavy capacitive loads or multiple TTL inputs without external buffers. |
| tPLH / tPHL | 4 ns / 2 ns - ensures sub-10 ns signal propagation for high-speed address/data latching in microprocessor buses. |
| VIH / VIL | 2.0 V / 0.8 V - guarantees reliable logic-level recognition across temperature and voltage corners in mixed-logic systems. |
| IOZH / IOZL | ±20 µA - specifies leakage in 3-state mode, critical for maintaining bus integrity when outputs are disabled. |
| θJA (N package) | 69 °C/W - defines thermal resistance for PDIP-20 package, informing heatsinking requirements under sustained IOL load. |
Pinout & Package
SN74ALS541-1NG4 is supplied in a 20-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and through-hole mounting. Pin 1 is located at the top-left corner marked by a notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | True data inputs; pnp-based inputs minimize DC loading on upstream drivers. |
| 9 | GND | Ground reference for logic and power return path. |
| 10 | VCC | Positive supply (4.5–5.5 V); decoupling capacitor placement near this pin is critical for noise immunity. |
| 11, 19 | OE1, OE2 | Active-low 3-state enable inputs; NOR logic means either high disables all outputs. |
| 12–18, 20 | Y1–Y8 Outputs | True (non-inverted) buffered outputs; each capable of sinking 48 mA in low state. |
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 crosstalk in dense bus layouts. |
| Enhanced sink drive (-1 version) | 48 mA IOL rating - supports driving longer traces, higher fanout, or legacy TTL loads without level-shifting. |
| pnp input structure | Reduces input current to ≤ –0.2 mA (IIL) - lowers power consumption and eases drive requirements from preceding logic stages. |
| Dual 3-state enable logic | NOR-gated OE1/OE2 - allows flexible bus arbitration via independent or shared enable signals across subsystems. |
Applications
| Memory Address Buffering | Microprocessor Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a microprocessor to multiple memory chips with shared address decode logic. IC Role / Device Role / Timing Role: Octal buffer isolating and strengthening address signals while enabling/disabling access to specific memory banks via OE control. Use Value: Prevents address line contention during bank switching and maintains signal integrity across 10+ inch PCB traces at 8 MHz clock rates. |
Use Scenario: Interfacing a Z80 or 8085 CPU data bus to peripheral controllers requiring isolated, high-current drive capability. IC Role / Device Role / Timing Role: Bidirectional bus driver (with external direction control) providing 48 mA sink strength for data write cycles. Use Value: Eliminates need for discrete transistor arrays or additional buffer stages when driving opto-isolators or relay drivers directly from the data bus. |
| Industrial Control Backplane | Legacy Instrumentation I/O Expansion |
Use Scenario: Distributing parallel control signals (e.g., stepper motor step/direction, DAC select lines) across a 200 mm backplane in PLC modules. IC Role / Device Role / Timing Role: Line driver ensuring fast edge rates and noise margin retention over unterminated 50 Ω traces. Use Value: Achieves <10 ns skew between channels and sustains reliable operation at –40°C to +85°C ambient with no derating. |
Use Scenario: Expanding GPIO count on vintage test equipment using ISA-style parallel expansion slots with strict timing budgets. IC Role / Device Role / Timing Role: True-output octal buffer synchronizing status flags and control bits to a 4 MHz system clock. Use Value: Meets setup/hold time margins (tsu = 10 ns, th = 5 ns) for ISA-compatible latch ICs while supporting hot-swap disable via OE pins. |
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 | Standard version with 24 mA max IOL (vs. 48 mA in -1 version); identical pinout, timing, and logic function. | Suitable for lower-fanout or shorter-trace applications where 48 mA drive is unnecessary. | Select SN74ALS541N only if load current remains ≤24 mA per output and VCC stays within full 4.5–5.5 V range. |
| SN74LS241N | LS-family octal buffer with 8 mA IOL, slower propagation (15–25 ns), and no -1 variant; shares same PDIP-20 footprint. | Applicable in cost-sensitive, low-speed legacy designs where ALS speed and drive strength are not required. | Choose SN74LS241N only when system timing budget exceeds 20 ns and total output load capacitance is <30 pF. |
Compared with SN74ALS541N and SN74LS241N, SN74ALS541-1NG4 delivers double the sink current and ~3× faster propagation, making it the sole choice for driving heavy capacitive loads or meeting tight timing windows in industrial backplanes and memory subsystems.
Availability
SN74ALS541-1NG4 is available at Aetrix Electronics and suitable for industrial control backplanes, legacy microprocessor bus extensions, and memory address buffering requiring stable component supply across extended product lifecycles.
Supply support for SN74ALS541-1NG4 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.
SN74ALS541-1NG4 belongs to TI's legacy Advanced Low-Power Schottky (ALS) logic family, engineered for high-speed, low-power bus interface applications in mission-critical industrial and military-grade systems.
FAQ
What is the maximum output sink current supported by SN74ALS541-1NG4?
The SN74ALS541-1NG4 supports a guaranteed 48 mA low-level output current (IOL) per channel, but only when VCC is maintained between 4.75 V and 5.25 V. This enhanced rating distinguishes it from the standard SN74ALS541N (24 mA IOL) and is validated per the SDAS025D datasheet Section "Recommended Operating Conditions." Exceeding this voltage window reverts performance to the standard 24 mA limit.
Does SN74ALS541-1NG4 support inverted output logic?
No, SN74ALS541-1NG4 provides true (non-inverted) output logic: Yn = An when enabled. For inverted outputs, TI offers the functionally complementary part SN74ALS540-1NG4, which outputs Yn = NOT(An). Both share identical pinout, timing, and drive specifications - only the data polarity differs.
What package type and lead finish does SN74ALS541-1NG4 use?
SN74ALS541-1NG4 is packaged in a 20-pin plastic dual in-line package (PDIP-N) with matte tin (NIPDAU) lead finish, RoHS-compliant, and rated for 0°C to 70°C operation. The "G4" suffix indicates TI's green packaging standard (halogen-free, lead-free finish), consistent with TI's 2006 environmental compliance program.
Can SN74ALS541-1NG4 be used in place of SN74ALS541N without design changes?
Yes - SN74ALS541-1NG4 is pin-compatible and functionally identical to SN74ALS541N, with identical pinout, logic behavior, and AC/DC specifications except for the higher 48 mA IOL rating. No PCB layout or firmware changes are needed; however, the enhanced drive capability should be verified against actual load conditions to avoid overstressing downstream components.
What is the purpose of the dual OE inputs (OE1 and OE2) on SN74ALS541-1NG4?
The dual OE inputs implement a 2-input NOR gate: asserting either OE1 or OE2 high places all eight Y outputs in high-impedance state. This enables flexible bus arbitration - for example, OE1 can serve as local subsystem enable while OE2 acts as global system reset, allowing hierarchical control without additional logic gates.
SN74ALS541-1NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
SN74ALS541-1NG4 FAQ
1.How can I place an order for SN74ALS541-1NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS541-1NG4 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 SN74ALS541-1NG4 reliable?
The price and inventory of SN74ALS541-1NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS541-1NG4 is usually 5 days.
3.What payment methods are accepted for SN74ALS541-1NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS541-1NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS541-1NG4?
SN74ALS541-1NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS541-1NG4 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 SN74ALS541-1NG4?
For technical support, including SN74ALS541-1NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS541-1NG4 requirements.
6.How does Aetrix verify that SN74ALS541-1NG4 is sourced from the original manufacturer or authorized distributors?
All SN74ALS541-1NG4 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 SN74ALS541-1NG4 meets industry standards.
7.What is the process for return or replacement of SN74ALS541-1NG4?
All SN74ALS541-1NG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS541-1NG4, 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 SN74ALS541-1NG4 part is unused and in its original packaging.
Return procedure for SN74ALS541-1NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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