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Texas Instruments SN74ALS541-1NSRE4
- Part No.:
- SN74ALS541-1NSRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS541-1NSRE4.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,171
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Product details
Overview
SN74ALS541-1NSRE4 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 features true (non-inverting) data flow, dual 3-state enable inputs (OE1/OE2), and supports 48 mA low-level output current (IOL) at VCC = 4.75–5.25 V - a key enhancement over standard 'ALS541 variants. It operates across 0°C to 70°C and is used in industrial control backplanes and legacy computing data paths.
For engineers reviewing the SN74ALS541-1NSRE4 datasheet, SN74ALS541-1NSRE4 pinout, SN74ALS541-1NSRE4 application, or SN74ALS541-1NSRE4 equivalent, this page delivers verified electrical specs, package dimensions, functional role in bus isolation, and validated alternatives for drop-in or functionally aligned replacement in legacy 5-V TTL designs.
Technical Context
This device implements an 8-channel non-inverting buffer with dual-NOR 3-state control logic: either OE1 or OE2 high forces all Y1–Y8 outputs into high-impedance state. Its pnp input structure reduces DC loading on driving sources, improving fan-out capability in dense logic arrays.
The -1 suffix denotes enhanced drive strength: IOL = 48 mA (vs. 24 mA in standard 'ALS541), while maintaining compatible AC timing (tPLH ≤ 14 ns, tPHL ≤ 10 ns at CL = 50 pF). It uses standard ALS process technology and shares pinout compatibility with SN74ALS540/'541 family members in NS, DW, N, and DB packages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures robust operation across 5-V TTL supply tolerances and noise margins. |
| IOL (max) | 48 mA - enables direct driving of heavy capacitive loads (e.g., >100 pF buses) without external buffers. |
| VOH (min) | 2.4 V at IOH = –12 mA - guarantees TTL-compatible high-level logic recognition under full load. |
| VOL (max) | 0.5 V at IOL = 48 mA - maintains valid low-state margin even at maximum sink current. |
| tPLH / tPHL | 4–14 ns / 2–10 ns - supports reliable operation up to ~50 MHz clock domains in synchronous bus applications. |
| Input Voltage Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - matches standard TTL logic levels for seamless integration with 74LS/ALS families. |
| 3-State Leakage | IOZL ≤ –20 µA, IOZH ≤ 20 µA - ensures minimal bus contention during high-Z state in multi-driver configurations. |
Pinout & Package
SOP-20 (NS package), 0.209-inch body width, 0.65 mm lead pitch, 2.0 mm max height. RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | True (non-inverting) data inputs; pnp structure minimizes DC loading on upstream drivers. |
| 9 | GND | Power ground reference for all internal logic and output stages. |
| 10, 20 | VCC | 5-V supply rail; dual VCC pins reduce switching noise coupling and improve power integrity. |
| 11, 19 | OE1, OE2 | Active-low 3-state enables (NOR logic); either high disables all outputs simultaneously. |
| 12, 13, 14, 15, 16, 17, 18, 19 | Y1–Y8 Outputs | True-buffered, 3-state outputs; capable of sinking 48 mA per channel in low state. |
| 20 | VCC | Second VCC connection - improves decoupling and reduces IR drop across bond wires. |
Key Features
| Feature | Design Value |
|---|---|
| Data Flowthrough Pinout | Inputs (A1–A8) on left side, outputs (Y1–Y8) on right side - simplifies PCB routing in parallel bus layouts with minimal layer transitions. |
| Dual 3-State Enable Logic | OE1 and OE2 form a 2-input NOR gate - allows flexible bus arbitration using either signal alone or combined control. |
| Enhanced Sink Current (-1 version) | 48 mA IOL rating - eliminates need for external pull-down resistors or additional drivers in high-capacitance memory address lines. |
| pnp Input Structure | Reduces input DC loading to ≤0.2 mA per input - increases fan-out capability when driving multiple 'ALS541 inputs from one source. |
| TTL-Compatible Thresholds | VIH = 2.0 V, VIL = 0.8 V - ensures interoperability with legacy 74LS, 74ALS, and microcontroller GPIOs without level-shifting. |
Applications
| Industrial Backplane Bus Buffering | Memory Address Register Interface |
|---|---|
Use Scenario: Isolating and driving 8-bit address lines between CPU and multiple peripheral modules on a DIN-rail-mounted PLC backplane. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing bidirectional bus isolation and enhanced drive strength for 100+ pF trace capacitance. Use Value: Eliminates signal degradation and timing skew across long parallel traces, enabling stable 20-MHz address strobe operation without added repeaters. |
Use Scenario: Latching and distributing 8-bit segment addresses from a Z80 or 8085-based controller to multiple EPROM banks. IC Role / Device Role / Timing Role: True-data buffer with 3-state control synchronized to MEMR/MEMW strobes for dynamic address bus sharing. Use Value: Supports simultaneous access to up to four memory devices via OE-controlled time-multiplexing, reducing chip count versus discrete gate solutions. |
| Legacy Computer I/O Expansion | TTL-Level Serial Data Line Driver |
Use Scenario: Expanding ISA-style I/O port addressing in retro-computing hardware using 74ALS logic families. IC Role / Device Role / Timing Role: Octal buffer isolating expansion slot address/data lines from motherboard resources with precise 3-state timing. Use Value: Prevents bus contention during hot-plug detection cycles by enabling fast, glitch-free output disable (tPZL = 8–20 ns). |
Use Scenario: Driving RS-232 line receivers (e.g., MAX232 inputs) requiring TTL-level logic signals with higher current than standard 74LS outputs provide. IC Role / Device Role / Timing Role: High-current buffer stage converting microcontroller UART TX output to robust 48-mA capable signal. Use Value: Ensures reliable logic-level transmission over longer PCB traces or noisy environments where LS-family drivers fail to meet VIH thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal non-inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS541NSR | Standard version: IOL = 24 mA (not 48 mA); identical pinout, timing, and voltage specs. | Not suitable for high-capacitance or high-fanout bus loads requiring >24 mA sink current. | Select SN74ALS541NSR only if design operates within 24 mA per output and cost optimization is prioritized. |
| SN74ACT541DBR | Advanced CMOS (ACT) family: 5-V tolerant, faster (tPLH ≤ 8 ns), but lower IOL = 24 mA and different input thresholds (VIH = 3.5 V). | Requires level-shifting when interfacing with pure TTL sources; unsuitable for mixed 74ALS/74LS systems without redesign. | Choose SN74ACT541DBR only for new 5-V CMOS designs needing speed and lower ICC, not for drop-in ALS replacement. |
Compared with SN74ALS541NSR and SN74ACT541DBR, SN74ALS541-1NSRE4 uniquely delivers 48 mA drive in a pin-compatible SOP-20 package while preserving legacy TTL voltage compatibility - making it the sole option for upgrading existing 'ALS541-based systems without layout or logic-level changes.
Availability
SN74ALS541-1NSRE4 is available at Aetrix Electronics and suitable for industrial backplane buffering, memory address distribution, and legacy computing I/O expansion requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74ALS541-1NSRE4 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.
SN74ALS541-1NSRE4 belongs to TI's legacy 74ALS logic family, engineered for high-speed, low-power TTL-compatible operation in mission-critical industrial control and computing infrastructure.
FAQ
What is the maximum output sink current supported by SN74ALS541-1NSRE4?
The SN74ALS541-1NSRE4 supports a guaranteed maximum low-level output current (IOL) of 48 mA per channel when VCC is maintained between 4.75 V and 5.25 V. This is explicitly defined in the "Recommended Operating Conditions" table of the SDAS025D datasheet and distinguishes the -1 variant from the standard SN74ALS541. The SN74ALS541-1NSRE4 must be operated within this VCC window to ensure full 48 mA compliance.
Is SN74ALS541-1NSRE4 pin-compatible with SN74ALS540-1NSR?
Yes, SN74ALS541-1NSRE4 is pin-compatible with SN74ALS540-1NSR in the NS package: both use identical SOP-20 footprints and share the same pin assignments for VCC, GND, A1–A8, Y1–Y8, OE1, and OE2. However, SN74ALS540-1NSR provides inverted outputs, whereas SN74ALS541-1NSRE4 provides true (non-inverting) outputs - functional substitution requires logic inversion elsewhere in the circuit.
Does SN74ALS541-1NSRE4 support 3.3-V logic interfaces?
No, SN74ALS541-1NSRE4 is strictly a 5-V TTL-family device. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output voltage specs (VOH ≥ 2.4 V at –12 mA) are designed for 5-V operation. It is not 3.3-V tolerant: applying 3.3-V inputs may result in marginal or unreliable switching, and VCC must be 4.5–5.5 V. For 3.3-V systems, consider TI's 74LVC or 74AUP families instead of SN74ALS541-1NSRE4.
What is the thermal resistance (θJA) of the NS package used in SN74ALS541-1NSRE4?
The NS (SOP-20) package for SN74ALS541-1NSRE4 has a specified junction-to-ambient thermal resistance (θJA) of 60°C/W, as documented in the "Absolute Maximum Ratings" section of the SDAS025D datasheet. This value assumes standard JEDEC test conditions (single-layer board, no copper pour). Actual θJA in end equipment will vary based on PCB layout, copper area, and airflow - derating is required above 70°C ambient.
Can SN74ALS541-1NSRE4 be used in place of SN74ALS541N in a through-hole design?
No - SN74ALS541-1NSRE4 uses an SOP-20 (surface-mount) NS package, while SN74ALS541N uses a PDIP-20 (through-hole) N package. They are not mechanically interchangeable. Though electrically identical in function and timing, replacing one with the other requires PCB redesign: footprint, stencil, and assembly process differ fundamentally. Use SN74ALS541-1N or SN74ALS541-1NE4 for through-hole compatibility with SN74ALS541N.
SN74ALS541-1NSRE4 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74ALS541-1NSRE4 FAQ
1.How can I place an order for SN74ALS541-1NSRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS541-1NSRE4 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 SN74ALS541-1NSRE4 reliable?
The price and inventory of SN74ALS541-1NSRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS541-1NSRE4 is usually 5 days.
3.What payment methods are accepted for SN74ALS541-1NSRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS541-1NSRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS541-1NSRE4?
SN74ALS541-1NSRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS541-1NSRE4 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 SN74ALS541-1NSRE4?
For technical support, including SN74ALS541-1NSRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS541-1NSRE4 requirements.
6.How does Aetrix verify that SN74ALS541-1NSRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ALS541-1NSRE4 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 SN74ALS541-1NSRE4 meets industry standards.
7.What is the process for return or replacement of SN74ALS541-1NSRE4?
All SN74ALS541-1NSRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS541-1NSRE4, 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 SN74ALS541-1NSRE4 part is unused and in its original packaging.
Return procedure for SN74ALS541-1NSRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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