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Texas Instruments SN74ALS541-1NE4
- Part No.:
- SN74ALS541-1NE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ALS541-1NE4.pdf
- Description:
- 8-CH, 4.75-V TO 5.25-V BIPOLAR B
- Quantity:
- Payment:
- Shipping:
Inventory:2,914
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Product details
Overview
SN74ALS541-1NE4 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 (IOL), operates at 4.5–5.5 V supply, and uses a data flowthrough pinout with inputs and outputs on opposite sides of the 20-pin PDIP package.
For engineers reviewing the SN74ALS541-1NE4 datasheet, SN74ALS541-1NE4 pinout, SN74ALS541-1NE4 application, or SN74ALS541-1NE4 equivalent, key selection considerations include its 48 mA IOL rating (enhanced vs standard 'ALS541), 3-state NOR-gated enable logic, pnp input structure reducing DC loading, and compatibility with legacy 5-V TTL bus architectures requiring high-drive octal buffering.
Technical Context
The SN74ALS541-1NE4 implements a TTL-compatible octal buffer architecture with two independent 3-state enable inputs (OE1 and OE2) feeding a 2-input NOR gate - either high disables all eight Y outputs into high-impedance. Its pnp input stage minimizes DC loading on driving sources, improving fan-out in dense logic systems.
Unlike the inverted-output SN74ALS540-1 variant, the SN74ALS541-1NE4 delivers true (non-inverted) logic transfer from A1–A8 to Y1–Y8. The "-1" suffix denotes enhanced low-level output drive capability: IOL = 48 mA (at VCC = 4.75–5.25 V), exceeding the standard 'ALS541's 24 mA rating - critical for driving heavy capacitive loads or long PCB traces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures robust operation across industrial-grade 5-V rail tolerances. |
| IOL (max) | 48 mA - enables direct drive of multiple TTL inputs or moderate-capacitance buses without external buffers. |
| tPLH / tPHL | 4 ns / 2 ns (max) - supports >50 MHz data throughput in short-path synchronous designs. |
| IOZH / IOZL | ±20 µA - guarantees minimal leakage in 3-state disabled mode, preserving bus integrity. |
| VIL / VIH | 0.8 V / 2.0 V - maintains full TTL input threshold compatibility for seamless integration with legacy logic families. |
| θJA (N package) | 69 °C/W - defines thermal derating limit for continuous 48 mA output operation in still-air environments. |
Pinout & Package
SN74ALS541-1NE4 is housed in a 20-pin plastic dual in-line package (PDIP-N), 0.300" wide, 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 logic inputs accepting TTL-level signals; pnp structure reduces DC loading on upstream drivers. |
| 9 | GND | Ground reference for all internal circuitry and output stages. |
| 10 | VCC | +5 V supply pin; decoupling capacitor placement near this pin is critical for noise immunity. |
| 11, 12 | OE1, OE2 | Active-low 3-state enable inputs - NOR logic means either high forces all Y outputs into high-Z state. |
| 13–20 | Y1–Y8 Outputs | True (non-inverted) buffered outputs with 48 mA sink capability; high-impedance when OE1/OE2 asserted. |
Key Features
| Feature | Design Value |
|---|---|
| Data flowthrough pinout | Inputs (A1–A8, OE1, OE2) on left side, outputs (Y1–Y8) on right side - simplifies PCB routing and minimizes trace crosstalk. |
| Enhanced output drive (-1 version) | 48 mA IOL rating (vs 24 mA in standard 'ALS541) - eliminates need for additional drivers in high-fanout memory address or data bus applications. |
| pnp input structure | Reduces input DC loading to ≤0.2 mA per input - increases effective fan-out when driven by standard TTL outputs. |
| Dual 3-state enable logic | NOR-gated OE1/OE2 allows flexible bus arbitration: either signal can independently disable all outputs, supporting multi-master control schemes. |
Applications
| Memory Address Buffering | Parallel Bus Isolation |
|---|---|
Use Scenario: Driving 16-bit address lines from a microprocessor to multiple memory ICs with shared address decode logic. IC Role / Device Role / Timing Role: True octal buffer providing low-latency, high-current address signal replication with 3-state isolation during DMA cycles. Use Value: Enables clean address propagation across 10+ TTL loads while allowing bus release via OE control - prevents address contention during peripheral access. |
Use Scenario: Isolating a CPU data bus from peripheral expansion slots in industrial backplane systems. IC Role / Device Role / Timing Role: Bidirectional bus driver (used unidirectionally) with fast enable/disable timing (tPZL = 8 ns max) for cycle-accurate slot arbitration. Use Value: 48 mA drive strength ensures reliable logic levels across 15 cm backplane traces; dual OE inputs simplify master/slave handshaking protocols. |
| Legacy System Bus Expansion | TTL-Level Logic Level Translation |
Use Scenario: Adding parallel I/O capability to vintage 8-bit microcontrollers (e.g., Z80, 6502) with limited drive strength. IC Role / Device Role / Timing Role: Octal buffer amplifying weak microcontroller port pins to drive LEDs, relays, or optocouplers directly. Use Value: Eliminates need for discrete transistor arrays - single SN74ALS541-1NE4 replaces eight 2N2222s with tighter timing control and lower board space. |
Use Scenario: Interfacing 3.3 V FPGA I/O banks to legacy 5 V TTL peripherals where level shifters are impractical. IC Role / Device Role / Timing Role: TTL-input compatible buffer accepting 3.3 V logic highs (VIH = 2.0 V min) and sourcing/sinking 5 V bus currents. Use Value: Provides safe, passive voltage translation without active circuitry - leverages inherent TTL input threshold margin for robust 3.3 V → 5 V interface. |
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: IOL = 24 mA (not 48 mA); identical pinout, timing, and logic function. | Suitable only for light-load bus driving (< 10 TTL units) or non-critical timing paths. | Select SN74ALS541N only if 48 mA drive is unnecessary - reduces cost but requires verification of fan-out margin. |
| SN74LS241N | Lower drive (IOL = 24 mA), higher ICC (25 mA vs 22 mA), slower tPHL (15 ns vs 10 ns), same 20-pin PDIP package. | Compatible for basic buffering but lacks pnp input structure - higher DC loading may reduce system fan-out. | Choose SN74LS241N only for drop-in replacement in existing LS-based designs where ALS speed/power trade-off is acceptable. |
Compared with SN74ALS541N and SN74LS241N, the SN74ALS541-1NE4 delivers superior drive strength and lower input loading - making it the optimal choice for high-reliability, high-fanout 5 V TTL bus applications where signal integrity and timing margin are critical.
Availability
SN74ALS541-1NE4 is available at Aetrix Electronics and suitable for memory address buffering, parallel bus isolation, and legacy system bus expansion requiring stable component supply and long-term industrial availability.
Supply support for SN74ALS541-1NE4 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 with over 90 years of analog and logic innovation, delivering high-reliability components for industrial, automotive, and aerospace applications.
The SN74ALS541-1NE4 belongs to TI's advanced low-power Schottky (ALS) logic family, engineered specifically for high-speed, low-noise 5 V TTL bus interfacing in mission-critical embedded and computing systems.
FAQ
What is the maximum output sink current for SN74ALS541-1NE4?
The SN74ALS541-1NE4 supports a maximum low-level output current (IOL) of 48 mA when VCC is between 4.75 V and 5.25 V - a key enhancement over the standard SN74ALS541N (24 mA). This rating is validated per the SDAS025D datasheet Section "Recommended Operating Conditions" and applies only to the "-1" version. Exceeding this current risks thermal overstress or output voltage degradation beyond VOL = 0.5 V.
How does the 3-state enable logic work on SN74ALS541-1NE4?
The SN74ALS541-1NE4 uses a 2-input NOR gate for 3-state control: if either OE1 or OE2 is driven high, all eight Y outputs enter high-impedance mode. Both OE inputs must be low to enable true data transfer from A1–A8 to Y1–Y8. This architecture allows flexible bus arbitration - for example, OE1 can serve as a system-wide disable while OE2 enables local peripheral control - without requiring external logic.
Is SN74ALS541-1NE4 pin-compatible with SN74ALS541N?
Yes, SN74ALS541-1NE4 is fully pin-compatible with SN74ALS541N - both use identical 20-pin PDIP (N) packaging, matching pin assignments for A1–A8, Y1–Y8, OE1, OE2, VCC, and GND. The "-1" suffix indicates only enhanced electrical performance (48 mA IOL), not mechanical or logical changes. No PCB layout modification is required when upgrading from SN74ALS541N to SN74ALS541-1NE4.
What is the purpose of the pnp input structure in SN74ALS541-1NE4?
The pnp input structure in SN74ALS541-1NE4 reduces DC input loading to ≤0.2 mA per input (vs ~1.6 mA in standard TTL), significantly increasing fan-out capability when driven by legacy logic outputs. This design lowers power dissipation in upstream drivers and improves noise margins in high-density boards - a critical advantage in memory address buffering where multiple 'ALS541-1NE4 devices may share one source.
Does SN74ALS541-1NE4 support inverted output functionality?
No, SN74ALS541-1NE4 provides true (non-inverted) data transfer: Y1 = A1, Y2 = A2, ..., Y8 = A8. For inverted outputs, TI offers the functionally complementary SN74ALS540-1NE4 - which shares identical pinout, timing, drive strength, and "-1" enhancements but inverts all eight channels. These two parts are often used together in systems requiring both true and complemented bus signals.
SN74ALS541-1NE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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
SN74ALS541-1NE4 FAQ
1.How can I place an order for SN74ALS541-1NE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS541-1NE4 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 SN74ALS541-1NE4 reliable?
The price and inventory of SN74ALS541-1NE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS541-1NE4 is usually 5 days.
3.What payment methods are accepted for SN74ALS541-1NE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS541-1NE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS541-1NE4?
SN74ALS541-1NE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS541-1NE4 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 SN74ALS541-1NE4?
For technical support, including SN74ALS541-1NE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS541-1NE4 requirements.
6.How does Aetrix verify that SN74ALS541-1NE4 is sourced from the original manufacturer or authorized distributors?
All SN74ALS541-1NE4 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 SN74ALS541-1NE4 meets industry standards.
7.What is the process for return or replacement of SN74ALS541-1NE4?
All SN74ALS541-1NE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS541-1NE4, 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 SN74ALS541-1NE4 part is unused and in its original packaging.
Return procedure for SN74ALS541-1NE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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