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Texas Instruments SN74ALS541DW
- Part No.:
- SN74ALS541DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS541DW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:108
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Product details
Overview
SN74ALS541DW 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 features true (non-inverting) data path, dual 3-state enable inputs (OE1/OE2), and operates at 4.5–5.5 V with IOL = 24 mA per output and tPLH ≤ 14 ns.
For engineers reviewing the SN74ALS541DW datasheet, SN74ALS541DW pinout, SN74ALS541DW application, or SN74ALS541DW equivalent, this device supports high-density PCB layout via data flowthrough pinout (inputs on one side, outputs on the other), low DC input loading via pnp inputs, and robust bus driving in industrial control and legacy computing interfaces.
Technical Context
The SN74ALS541DW 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 reduces DC loading on upstream logic, improving fanout capability in cascaded TTL systems.
It belongs to the ALS (Advanced Low-Power Schottky) family, delivering performance comparable to SN74ALS240A but with optimized pinout-inputs (A1–A8) on left side, outputs (Y1–Y8) on right side, and enables (OE1/OE2) adjacent to VCC/GND-enabling simplified trace routing on double-layer PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL and ALS logic rails. |
| Output Drive (IOL) | 24 mA per output - Supports direct connection to multiple TTL loads or termination-resistor-biased buses. |
| Propagation Delay (tPLH) | Max 14 ns at VCC = 4.5–5.5 V, CL = 50 pF - Enables reliable operation in 30+ MHz address/data strobe timing windows. |
| 3-State Enable Logic | NOR-gated OE1/OE2 - Single-line disable possible; OR-style control simplifies bus arbitration logic design. |
| Input Structure | pnp-based - Reduces input current (IIL = –0.2 mA max), lowering power draw and heat generation in high-fanout configurations. |
| Thermal Impedance (θJA) | 58 °C/W (SOIC-DW) - Allows sustained operation up to 70°C ambient without forced cooling in typical board layouts. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded systems, test equipment, and industrial controllers. |
Pinout & Package
SN74ALS541DW is housed in a 20-pin SOIC (DW) package measuring 13.0 mm × 7.6 mm × 2.65 mm, with 1.27 mm lead pitch and gull-wing leads compatible with standard reflow profiles (MSL Level-1).
| 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 source drivers. |
| 9 | GND | Ground reference for all internal circuitry and output stage return path. |
| 10 | VCC | +5 V supply rail; decoupling capacitor placement near this pin is critical for noise immunity. |
| 11, 19 | OE1, OE2 | Active-low 3-state enables; NOR logic means either high disables all outputs simultaneously. |
| 12, 13, 14, 15, 16, 17, 18, 20 | Y1–Y8 Outputs | True-buffered, 3-state outputs; capable of sourcing –12 mA or sinking 24 mA each. |
Key Features
| Feature | Design Value |
|---|---|
| Data flowthrough pinout | Inputs (A1–A8) on left edge, outputs (Y1–Y8) on right edge - eliminates layer jumps and crossovers in dense bus routing. |
| Dual 3-state enable (OE1/OE2) | NOR-gated control - supports flexible bus arbitration: one enable for local control, second for system-wide disable. |
| pnp input structure | IIL ≤ –0.2 mA - cuts input current by >50% vs. standard TTL, enabling higher fanout without buffers. |
| ALS family speed-power balance | tPLH ≤ 14 ns / ICC ≤ 25 mA (all outputs low) - delivers 2× speed of LS-TTL at similar quiescent power. |
| Bus-compatible output drive | IOL = 24 mA, VOL ≤ 0.4 V - meets TTL input VIH/VIL thresholds when driving 10+ unit loads or unterminated stubs. |
Applications
| Industrial PLC Backplane Interface | Legacy Computer Memory Address Buffering |
|---|---|
Use Scenario: Isolating CPU address bus from multiple peripheral modules in modular control cabinets. IC Role / Device Role / Timing Role: Unidirectional address latch buffer with 3-state control synchronized to bus grant signals. Use Value: Prevents address contention during module hot-swap; pnp inputs reduce loading on aging microprocessor address pins. |
Use Scenario: Driving 20-bit memory address lines across a 150 mm backplane in 1980s-era minicomputer designs. IC Role / Device Role / Timing Role: True-level address repeater with propagation delay under 14 ns to meet 30 MHz clock timing budgets. Use Value: Maintains setup/hold margins across long traces; SOIC-DW package enables compact, repairable daughterboard layouts. |
| Test Equipment Digital Pattern Generator | Automated Test Fixture Signal Conditioning |
Use Scenario: Generating synchronized 8-bit parallel stimulus waveforms for DUT input ports under boundary-scan control. IC Role / Device Role / Timing Role: Output buffer stage controlled by pattern generator's global enable signal. Use Value: 24 mA drive ensures clean edges into 50 Ω coaxial cables; 3-state allows safe sharing of test bus among multiple instruments. |
Use Scenario: Level-shifting and bus-driving between FPGA I/O banks and legacy 5 V logic in production test jigs. IC Role / Device Role / Timing Role: Translation buffer with 5 V tolerant inputs and robust output sink capability. Use Value: Eliminates need for discrete level translators; SOIC-DW footprint matches standard test socket pitch for rapid fixture replacement. |
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 | Same logic function and electrical specs, but in 20-pin PDIP (N) package - 69 °C/W θJA, through-hole mounting. | Suitable for prototyping, manual assembly, or legacy through-hole boards where SOIC reflow is unavailable. | Select SN74ALS541N for hand-soldered development or field-repair scenarios requiring mechanical robustness over density. |
| SN74ALS541DWR | Identical SOIC-DW die and pinout, but supplied in tape-and-reel (2000 pcs) - same thermal and timing specs, RoHS-compliant NIPDAU finish. | Optimized for automated SMT production; MSL Level-1 allows unlimited floor life before reflow. | Choose SN74ALS541DWR for volume manufacturing where pick-and-place efficiency and traceability are required. |
Compared with SN74ALS541N and SN74ALS541DWR, the SN74ALS541DW offers identical core functionality in obsolete tube packaging - its value lies in legacy inventory reuse or niche repair contexts where tape-and-reel or through-hole variants are unsuitable.
Availability
SN74ALS541DW is available at Aetrix Electronics and suitable for industrial PLC backplane interface, legacy computer memory address buffering, and automated test fixture signal conditioning requiring stable component supply and long-term BOM continuity.
Supply support for SN74ALS541DW 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 SN74ALS541DW belongs to TI's legacy Advanced Low-Power Schottky (ALS) logic family, engineered for high-speed, low-power bus interfacing in 1980s–1990s industrial and computing systems where reliability and pinout-driven layout efficiency were critical.
FAQ
What is the logic function of SN74ALS541DW?
The SN74ALS541DW is an octal non-inverting buffer with 3-state outputs. It passes A1–A8 inputs directly to Y1–Y8 outputs when both OE1 and OE2 are low; all outputs enter high-impedance state if either OE1 or OE2 is high. This behavior is defined by a dual-input NOR gate controlling the 3-state drivers. The SN74ALS541DW does not invert data - unlike the SN74ALS540 - and uses pnp inputs to minimize DC loading.
Is SN74ALS541DW still in active production?
No - according to TI's official packaging addendum, SN74ALS541DW is marked "Obsolete" with no carrier quantity listed, while SN74ALS541DWR (tape-and-reel) remains active. The SN74ALS541DW was historically supplied in tubes, but current production and logistics support focus on SN74ALS541DWR for SMT lines. Aetrix Electronics maintains limited legacy stock of SN74ALS541DW for repair and continuity use.
What package type is SN74ALS541DW?
SN74ALS541DW uses the SOIC (Small Outline Integrated Circuit) DW package: 20-pin, 13.0 mm × 7.6 mm body, 1.27 mm lead pitch, gull-wing leads, and maximum height of 2.65 mm. Its JEDEC MS-013 registered outline ensures compatibility with standard SOIC footprints, stencil apertures, and reflow profiles (MSL Level-1).
Can SN74ALS541DW drive TTL loads directly?
Yes - SN74ALS541DW is fully TTL-compatible. With IOL = 24 mA per output and VOL ≤ 0.4 V at that load, it meets the VIH ≥ 2.0 V and VIL ≤ 0.8 V thresholds of standard TTL and ALS inputs. Its pnp inputs also ensure low IIL (≤ –0.2 mA), allowing it to drive up to 20+ standard TTL unit loads without intermediate buffering.
How does the 3-state enable logic work on SN74ALS541DW?
The SN74ALS541DW uses a 2-input NOR gate for 3-state control: outputs go high-impedance if OE1 = HIGH or OE2 = HIGH; outputs are active only when both OE1 = LOW and OE2 = LOW. This architecture allows flexible bus control - for example, OE1 can be tied to a local peripheral select, while OE2 serves as a global bus reset. No external pull-ups or logic gates are needed to implement OR-style enable behavior.
SN74ALS541DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ALS541DW FAQ
1.How can I place an order for SN74ALS541DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS541DW 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 SN74ALS541DW reliable?
The price and inventory of SN74ALS541DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS541DW is usually 5 days.
3.What payment methods are accepted for SN74ALS541DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS541DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS541DW?
SN74ALS541DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS541DW 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 SN74ALS541DW?
For technical support, including SN74ALS541DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS541DW requirements.
6.How does Aetrix verify that SN74ALS541DW is sourced from the original manufacturer or authorized distributors?
All SN74ALS541DW 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 SN74ALS541DW meets industry standards.
7.What is the process for return or replacement of SN74ALS541DW?
All SN74ALS541DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS541DW, 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 SN74ALS541DW part is unused and in its original packaging.
Return procedure for SN74ALS541DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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