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Texas Instruments SN74ALS541-1DWR
- Part No.:
- SN74ALS541-1DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS541-1DWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,924
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Product details
Overview
SN74ALS541-1DWR 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, features dual 3-state enable inputs (OE1/OE2), supports 48 mA low-level output current (IOL), and operates across 0°C to 70°C with 5 V supply.
For engineers reviewing the SN74ALS541-1DWR datasheet, SN74ALS541-1DWR pinout, SN74ALS541-1DWR application, or SN74ALS541-1DWR equivalent, this device is selected for high-drive 3-state bus buffering where input/output separation, pnp-input DC loading reduction, and legacy ALS logic timing are required.
Technical Context
The SN74ALS541-1DWR implements a dual-NOR 3-state control 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-enabling simplified PCB routing in dense bus architectures.
It belongs to the ALS (Advanced Low-Power Schottky) family, delivering improved speed-power trade-offs over standard LS logic. The "-1" suffix denotes enhanced IOL capability (48 mA vs. 24 mA), validated only at VCC = 4.75–5.25 V, with propagation delays as low as 2 ns (tPHL) and disable times down to 1 ns (tPHZ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL rails and tolerant of nominal ±10% variation. |
| IOL (Low-Level Output Current) | 48 mA - enables direct driving of heavy capacitive loads or multiple TTL inputs without external buffers. |
| tPLH / tPHL Propagation Delay | 4 ns / 2 ns - ensures fast signal transfer between address/data buses and memory peripherals. |
| tPZH / tPHZ Enable/Disable Time | 5 ns / 1 ns - supports rapid bus arbitration and time-critical 3-state switching in multiplexed systems. |
| Input Voltage Thresholds (VIH/VIL) | 2.0 V / 0.8 V - guarantees robust noise margin and compatibility with 5 V CMOS and TTL logic families. |
| Package Thermal Impedance (θJA) | 58 °C/W - SOIC-DW package allows sustained operation under moderate power dissipation without forced cooling. |
| Operating Temperature Range | 0°C to 70°C - rated for commercial-grade industrial control, instrumentation, and computing applications. |
Pinout & Package
SN74ALS541-1DWR is housed in a 20-pin SOIC (DW) package measuring 7.5 mm × 12.8 mm × 2.65 mm, with gull-wing leads, RoHS-compliant NiPdAu plating, and moisture sensitivity level (MSL) 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | True-data inputs; pnp-input structure reduces DC loading on upstream drivers. |
| 9 | GND | Ground reference for all logic and output stages; must be low-impedance for stable 3-state transitions. |
| 10, 20 | VCC | Primary 5 V supply; dual VCC pins improve power distribution and reduce IR drop in high-IOL operation. |
| 11, 19 | OE1, OE2 | Active-low 3-state enables; NOR logic means either high disables all outputs - supports redundant or split-bus control. |
| 12, 13, 14, 15, 16, 17, 18, 19 | Y1–Y8 Outputs | True-buffered, 3-state outputs; capable of sinking 48 mA each while maintaining VOL ≤ 0.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Data Flowthrough Pinout | Inputs (A1–A8) on left side, outputs (Y1–Y8) on right side - eliminates layer-crossing traces and minimizes crosstalk in parallel bus layouts. |
| pnp Input Structure | Reduces input DC loading to ≤0.2 mA per pin - preserves drive strength of upstream logic and extends fan-out capability. |
| Dual 3-State Enable Logic | OE1 and OE2 form a 2-input NOR gate - enables flexible bus arbitration using either signal alone or OR'd control lines. |
| -1 Version Enhanced Drive | Guaranteed 48 mA IOL (vs. 24 mA in standard version) - supports legacy backplane loads and high-capacitance PCB traces without derating. |
| ALS Family Performance | Combines LS-speed (sub-10 ns delays) with lower power consumption than AS logic - ideal for cost-sensitive, thermally constrained designs. |
Applications
| Memory Address Buffering | Parallel Bus Isolation |
|---|---|
Use Scenario: Buffering 8-bit address lines between microprocessor and SRAM/ROM chips in embedded controllers. IC Role / Device Role / Timing Role: Acts as unidirectional, 3-state address latch driver; isolates CPU address bus during DMA or peripheral access. Use Value: Prevents address bus contention and ensures clean edge integrity across long traces, leveraging 2 ns tPHL and 48 mA drive to meet setup/hold timing. |
Use Scenario: Enabling/disabling data paths between two microcontrollers sharing a common 8-bit parallel interface. IC Role / Device Role / Timing Role: Functions as bidirectional bus switch controller; OE1/OE2 allow independent direction control or simultaneous tri-state. Use Value: Eliminates need for external direction logic; fast 1 ns tPHZ enables sub-microsecond bus handoff in real-time inter-processor communication. |
| Legacy System Bus Expansion | Industrial I/O Module Interface |
Use Scenario: Adding peripheral slots to vintage 8-bit computer backplanes (e.g., S-100, ISA derivatives) requiring TTL-compatible drive. IC Role / Device Role / Timing Role: Serves as bus transceiver buffer; matches ALS timing and voltage thresholds of original system components. Use Value: Maintains signal integrity across extended bus lengths up to 30 cm, supported by 48 mA sink capability and low VOL (≤0.5 V). |
Use Scenario: Interfacing PLC CPU modules to discrete I/O cards with high-capacitance ribbon cable harnesses. IC Role / Device Role / Timing Role: Provides robust output buffering for 24 V optocoupler inputs or relay drivers via level-shifting interfaces. Use Value: Delivers reliable 3-state isolation during hot-swap events and withstands transient-induced ground bounce due to pnp input immunity. |
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 |
|---|---|---|---|
| SN74ALS541DWR | Standard version: IOL = 24 mA (not 48 mA); identical pinout, timing, and voltage specs. | Suitable for lighter bus loads (<15 pF) or shorter trace lengths where 48 mA is not required. | Select when thermal budget or load capacitance permits lower drive; avoids over-spec'ing for cost-sensitive volume production. |
| SN74LS241N | LS-family part: higher ICC (15–25 mA), slower tPHL (15 ns), no -1 variant; PDIP-only, no SOIC option. | Limited to legacy through-hole designs; lacks ALS speed and SOIC packaging flexibility. | Choose only for direct LS-system replacement where board layout prohibits SOIC or timing margins exceed 15 ns. |
Compared with SN74ALS541DWR and SN74LS241N, the SN74ALS541-1DWR uniquely delivers 48 mA drive in a surface-mount SOIC package with ALS-speed timing-making it the optimal choice for modern retrofits and space-constrained industrial bus nodes requiring legacy compatibility and enhanced sink capability.
Availability
SN74ALS541-1DWR is available at Aetrix Electronics and suitable for memory address buffering, parallel bus isolation, and industrial I/O module interface applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS541-1DWR 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 SN74ALS541-1DWR belongs to TI's legacy ALS logic product line, engineered specifically for high-reliability, pin-compatible upgrades of LS-series buffers in mission-critical industrial and computing infrastructure.
FAQ
What is the maximum recommended low-level output current for SN74ALS541-1DWR?
The SN74ALS541-1DWR is rated for a maximum low-level output current (IOL) of 48 mA, but this value is guaranteed only when VCC is maintained between 4.75 V and 5.25 V. At wider VCC ranges (4.5 V–5.5 V), the standard 24 mA rating applies. This enhanced drive supports heavy capacitive loads and multiple TTL inputs without external amplification.
Does SN74ALS541-1DWR support inverted or true data output?
SN74ALS541-1DWR provides true (non-inverted) data output - Yn = An for all channels. This distinguishes it from the SN74ALS540-1DWR, which offers inverted outputs (Yn = NOT An). Both share identical pinout, 3-state control, and electrical specifications except for data polarity.
What is the function of OE1 and OE2 on SN74ALS541-1DWR?
OE1 and OE2 are active-low 3-state enable inputs wired internally as a 2-input NOR gate. If either OE1 or OE2 is driven high, all eight Y outputs enter high-impedance state. Both must be low to enable true-data output. This architecture allows flexible bus control using single or dual enable signals.
Is SN74ALS541-1DWR pin-compatible with SN74ALS541DWR?
Yes, SN74ALS541-1DWR is fully pin-compatible with SN74ALS541DWR - same SOIC-20 (DW) footprint, identical pin assignments, and matching AC/DC electrical characteristics except for the enhanced 48 mA IOL rating. No PCB redesign is needed when upgrading from the standard to the -1 version.
What package type and dimensions does SN74ALS541-1DWR use?
SN74ALS541-1DWR uses a 20-pin SOIC (DW) package measuring 7.5 mm × 12.8 mm × 2.65 mm, with 1.27 mm lead pitch and gull-wing terminations. It complies with JEDEC MS-013, has MSL Level-1 rating, and features NiPdAu lead finish for reliable solderability and RoHS compliance.
SN74ALS541-1DWR 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:
- 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, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ALS541-1DWR FAQ
1.How can I place an order for SN74ALS541-1DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS541-1DWR 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 SN74ALS541-1DWR reliable?
The price and inventory of SN74ALS541-1DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS541-1DWR is usually 5 days.
3.What payment methods are accepted for SN74ALS541-1DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS541-1DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS541-1DWR?
SN74ALS541-1DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS541-1DWR 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 SN74ALS541-1DWR?
For technical support, including SN74ALS541-1DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS541-1DWR requirements.
6.How does Aetrix verify that SN74ALS541-1DWR is sourced from the original manufacturer or authorized distributors?
All SN74ALS541-1DWR 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 SN74ALS541-1DWR meets industry standards.
7.What is the process for return or replacement of SN74ALS541-1DWR?
All SN74ALS541-1DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS541-1DWR, 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 SN74ALS541-1DWR part is unused and in its original packaging.
Return procedure for SN74ALS541-1DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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