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Texas Instruments SN74ALS541DWR
- Part No.:
- SN74ALS541DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS541DWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:588
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Product details
Overview
SN74ALS541DWR 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), 20-pin SOIC (DW) package, and supports 12 mA low-level output current at 5 V supply.
For engineers reviewing the SN74ALS541DWR datasheet, SN74ALS541DWR pinout, SN74ALS541DWR application, or SN74ALS541DWR equivalent, this device is selected for high-reliability 5 V logic isolation, bidirectional bus control, and legacy system upgrades requiring pnp-input noise immunity and data-flowthrough layout optimization.
Technical Context
The SN74ALS541DWR 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 driving sources, improving fan-out in dense logic arrays.
It uses ALS (Advanced Low-Power Schottky) bipolar technology, delivering propagation delays as low as 2 ns (tPHL) and 4 ns (tPLH) under 50 pF load, with guaranteed 3-state disable times (tPZL up to 20 ns) and enable times (tPHZ down to 1 ns) for precise bus arbitration timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - Operates within standard TTL rail; tolerates 5 V ±10% without regulation. |
| Low-Level Output Current (IOL) | 12 mA - Drives standard TTL loads directly; sufficient for 10-unit load (UL) bus termination. |
| Propagation Delay (tPLH/tPHL) | 4 ns / 2 ns - Enables reliable operation up to ~100 MHz clock domains in short trace layouts. |
| 3-State Disable Time (tPZL) | 20 ns - Ensures clean bus release before next driver activation; critical for multi-master arbitration. |
| Input Voltage Thresholds (VIH/VIL) | 2.0 V / 0.8 V - Fully compatible with 5 V TTL logic families; no level-shifting required. |
| Package Type | SOIC-20 (DW) - Surface-mount, 0.3" wide body; JEDEC MS-013 compliant; RoHS-compliant NIPDAU finish. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade industrial control and instrumentation applications. |
Pinout & Package
SN74ALS541DWR is housed in a 20-pin SOIC (DW) package measuring 13.0 mm × 7.6 mm × 2.65 mm max height, with 1.27 mm lead pitch and gull-wing leads. Pin 1 is located at the top-left corner (quadrant Q1) per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | True (non-inverting) data inputs; pnp structure lowers DC input current to ≤0.2 mA. |
| 9 | GND | Ground reference for all internal circuitry and output drivers. |
| 10, 11 | OE1, OE2 | Active-low 3-state enables; NOR logic - either high disables all outputs. |
| 12, 13, 14, 15, 16, 17, 18, 19 | Y1–Y8 Outputs | True buffered outputs; capable of sourcing –12 mA or sinking 12 mA in active state. |
| 20 | VCC | +5 V power supply; decoupling capacitor (0.1 µF) recommended adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Data-flowthrough pinout | Inputs (A1–A8) on left side, outputs (Y1–Y8) on right side - minimizes PCB trace crossovers and routing congestion. |
| pnp input structure | Reduces input current to –0.2 mA (max) at VIL, lowering drive burden on upstream logic and improving system fan-out. |
| Dual 3-state enable (OE1/OE2) | NOR-gated control allows flexible bus arbitration: either enable asserted → full output disable; supports redundant control paths. |
| ALS process technology | Combines Schottky-clamped bipolar transistors with low-power design - achieves 12 mA IOL at <15 mA ICC (outputs low). |
| TTL-compatible thresholds | VIH = 2.0 V, VIL = 0.8 V - interoperable with 74LS, 74F, and legacy 74S families without interface logic. |
Applications
| Memory Address Buffering | Parallel Bus Isolation |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a microprocessor to multiple memory ICs (e.g., SRAM, EPROM) in a shared-bus architecture. IC Role / Device Role / Timing Role: Unidirectional non-inverting buffer that isolates CPU address outputs from capacitive bus loading and prevents contention during memory access cycles. Use Value: Enables stable 5 V address propagation across >10 cm traces with tPHL ≤2 ns, eliminating setup/hold violations in 8-MHz Z80 or 68000-based systems. |
Use Scenario: Segregating two independent 8-bit data buses (e.g., CPU data bus and peripheral controller bus) using a single directional path. IC Role / Device Role / Timing Role: Controlled 3-state driver enabling time-multiplexed bus sharing; OE1/OE2 coordinated with bus grant signals. Use Value: Prevents bus contention during DMA transfers by ensuring only one driver is active; tPZL = 20 ns guarantees safe turn-off before next driver activates. |
| Legacy System Upgrade Interface | Industrial Control I/O Expansion |
|
Use Scenario: Replacing obsolete 74LS244 buffers in aging PLC backplanes where board space and pin compatibility are constrained. IC Role / Device Role / Timing Role: Drop-in functional replacement with identical pinout (SOIC-20 DW), improved speed, and lower power than LS family. Use Value: Maintains existing PCB layout while reducing power dissipation by ~30% and increasing noise margin via pnp inputs. |
Use Scenario: Interfacing microcontroller GPIO ports to high-current industrial sensors (e.g., 24 V proximity switches) via optocoupler input stages. IC Role / Device Role / Timing Role: Logic-level translator and current booster between MCU I/O and discrete transistor driver stages. Use Value: Sinks 12 mA per channel to reliably drive base resistors of NPN switching transistors, supporting 10+ sensor inputs per device. |
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 |
|---|---|---|---|
| SN74ALS244N | Same ALS process, but dual 4-bit configuration with separate OE controls per group; 20-pin PDIP only. | Lacks data-flowthrough pinout; requires more complex PCB routing in dense layouts. | Prefer when independent control of two 4-bit channels is needed over unified 8-bit enable. |
| SN74ACT541PW | CMOS ACT family; 5 V tolerant, 24 mA IOL, faster tPLH (3.5 ns), but higher VIH (3.5 V min) and no pnp inputs. | Not TTL-compatible at input stage; requires pull-up or level-shifted drivers in legacy systems. | Select for new designs needing lower ICC (<4 mA) and higher noise immunity, not for drop-in replacement. |
Compared with SN74ALS244N and SN74ACT541PW, the SN74ALS541DWR uniquely balances legacy TTL compatibility, pnp-input loading reduction, and optimized SOIC pinout - making it the only choice for retrofitting space-constrained 5 V bus systems without redesigning signal routing.
Availability
SN74ALS541DWR is available at Aetrix Electronics and suitable for memory subsystems, industrial PLC backplanes, and legacy microprocessor bus interfaces requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for SN74ALS541DWR 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 SN74ALS541DWR belongs to TI's legacy 74ALS logic family, engineered specifically for high-speed, low-power 5 V TTL system interfacing - targeting reliability-critical upgrades in manufacturing equipment and avionics support hardware.
FAQ
What is the maximum output sink current for SN74ALS541DWR at 5 V supply?
The SN74ALS541DWR supports a guaranteed low-level output current (IOL) of 12 mA per channel when VCC = 4.5 V to 5.5 V. This rating applies to the standard version (non-"-1") and ensures reliable driving of TTL loads and discrete transistor bases without external amplification. The "-1" variant increases IOL to 48 mA but is not applicable to SN74ALS541DWR.
Does SN74ALS541DWR have pin-to-pin compatibility with SN74LS244?
No, SN74ALS541DWR is not pin-to-pin compatible with SN74LS244. While both are octal 3-state buffers in 20-pin packages, SN74ALS541DWR places all inputs (A1–A8) on pins 1–8 and outputs (Y1–Y8) on pins 12–19, whereas SN74LS244 groups inputs and outputs alternately. The SN74ALS541DWR's data-flowthrough layout is intentional for simplified PCB routing, not backward pin compatibility.
Can SN74ALS541DWR operate with a 3.3 V supply?
No, SN74ALS541DWR is specified only for 4.5 V to 5.5 V operation. Its ALS bipolar process requires minimum 4.5 V to ensure proper transistor biasing and guaranteed switching performance. At 3.3 V, parameters like VOH, VOL, and propagation delay fall outside specification, and the device may fail to toggle or exhibit excessive ICC. Use 74LVC541 or similar for 3.3 V systems.
What is the thermal resistance (θJA) of the SN74ALS541DWR SOIC package?
The SN74ALS541DWR in SOIC (DW) package has a junction-to-ambient thermal resistance (θJA) of 58°C/W, measured per JESD 51-7. This value assumes standard JEDEC 2-layer test board conditions. For sustained 12 mA per output operation across all eight channels, peak die temperature remains within safe limits below 100°C at 25°C ambient - provided adequate copper pour and airflow are maintained.
How does the dual OE (OE1/OE2) control logic function in SN74ALS541DWR?
The SN74ALS541DWR implements a 2-input NOR gate for 3-state control: if either OE1 or OE2 is driven high, all eight Y outputs enter high-impedance state. Both OE inputs must be low to enable output driving. This design allows flexible bus arbitration - e.g., OE1 tied to CPU control, OE2 to DMA controller - ensuring exclusive bus access without external logic.
SN74ALS541DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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, 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
SN74ALS541DWR FAQ
1.How can I place an order for SN74ALS541DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS541DWR 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 SN74ALS541DWR reliable?
The price and inventory of SN74ALS541DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS541DWR is usually 5 days.
3.What payment methods are accepted for SN74ALS541DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS541DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS541DWR?
SN74ALS541DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS541DWR 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 SN74ALS541DWR?
For technical support, including SN74ALS541DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS541DWR requirements.
6.How does Aetrix verify that SN74ALS541DWR is sourced from the original manufacturer or authorized distributors?
All SN74ALS541DWR 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 SN74ALS541DWR meets industry standards.
7.What is the process for return or replacement of SN74ALS541DWR?
All SN74ALS541DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS541DWR, 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 SN74ALS541DWR part is unused and in its original packaging.
Return procedure for SN74ALS541DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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