My Inquiry
My Account
Texas Instruments SN74ALS2541DW
- Part No.:
- SN74ALS2541DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS2541DW.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,455
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ALS2541DW from Texas Instruments is a dual 8-bit non-inverting buffer/driver with 3-state outputs, designed for address/data bus interface in TTL-compatible digital systems. It features 20-pin SOIC (DW) package, ±24mA output drive capability, 15ns typical propagation delay at VCC = 5V, and operates over 4.5V to 5.5V supply range. It supports high-speed bidirectional data transfer in memory expansion and microprocessor peripheral interfacing.
For engineers reviewing the SN74ALS2541DW datasheet, SN74ALS2541DW pinout, SN74ALS2541DW application, or SN74ALS2541DW equivalent, key selection considerations include its ALS logic family speed-power trade-off, 3-state enable timing, bus-hold compatibility, and legacy 5V TTL system integration requirements.
Technical Context
This device integrates two independent 8-bit buffers, each with separate active-low output-enable (OE1̅, OE2̅) controls, enabling simultaneous or staggered bus isolation. Its bipolar ALS (Advanced Low-power Schottky) process delivers faster switching than standard LS while maintaining compatible input thresholds and noise margins.
Each buffer section provides true non-inverting output logic, with guaranteed VOH ≥ 2.7V and VOL ≤ 0.5V under full load (±24mA), supporting robust fanout to multiple TTL inputs. Input hysteresis is not present; it relies on standard TTL voltage thresholds for noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-power Schottky) - balances speed (vs LS) and power (vs AS), compatible with TTL input/output levels. |
| Supply Voltage | 4.5V to 5.5V - ensures stable operation across industrial-grade 5V rails with ±10% tolerance. |
| Propagation Delay | 15ns max (tPLH/tPHL at VCC = 5V, CL = 50pF) - enables reliable timing in 33–40MHz bus cycles. |
| Output Drive | ±24mA (IOH/IO L) - drives up to 20 standard TTL loads per output without external buffering. |
| 3-State Enable Time | 15ns max (tPZL/tPZH) - allows fast bus arbitration and minimizes contention windows during mode transitions. |
| Input Thresholds | VIL ≤ 0.8V, VIH ≥ 2.0V - matches standard TTL logic levels for seamless interoperation with 74LS/74F devices. |
Pinout & Package
SN74ALS2541DW is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with DW drawing code, 7.5mm body width, and gull-wing leads. Moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Channel A inputs (A1–A8) | Active-high TTL-compatible data inputs for first 8-bit buffer group. |
| 9, 10, 11, 12, 13, 14, 15, 16 | Channel B inputs (B1–B8) | Active-high TTL-compatible data inputs for second 8-bit buffer group. |
| 17, 18, 19, 20 | GND, VCC, OE1̅, OE2̅ | Ground, +5V supply, active-low enable for Channel A, active-low enable for Channel B. |
| 1′–8′ (pins 1′–8′ correspond to pins 1–8 mirrored as outputs) | Y1–Y8 (A-side outputs) | Non-inverting 3-state outputs driven by A inputs when OE1̅ = LOW. |
| 9′–16′ (pins 9′–16′ correspond to pins 9–16 mirrored as outputs) | Y1–Y8 (B-side outputs) | Non-inverting 3-state outputs driven by B inputs when OE2̅ = LOW. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 8-bit buffers | Enables isolated control of two data buses (e.g., address vs data) using separate OE signals. |
| ±24mA output sink/source | Eliminates need for external line drivers when interfacing to multiple TTL loads or long PCB traces. |
| 15ns propagation delay | Supports synchronous bus operation up to 40MHz clock domains in legacy microprocessor systems. |
| 3-state outputs with low enable skew | Ensures deterministic bus release timing between channels, preventing data contention during multiplexing. |
| TTL-compatible input thresholds | Guarantees interoperability with 74LS, 74F, and other 5V logic families without level-shifting circuitry. |
Applications
| Microprocessor Address Bus Expansion | Memory Module Data Buffering |
|---|---|
Use Scenario: Extending 16-bit address bus from CPU to multiple memory banks in industrial PLC controllers. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer isolating upper/lower address bytes during memory decode cycles. Use Value: Enables clean address latching with <15ns delay margin, preventing setup/hold violations at 25MHz bus clocks. | Use Scenario: Driving parallel data lines between FPGA controller and SRAM/ROM modules in avionics display units. IC Role / Device Role / Timing Role: Bidirectional data bus driver with independent channel enables for read/write direction control. Use Value: ±24mA drive strength maintains signal integrity across 10cm PCB traces without termination resistors. |
| Legacy Industrial Backplane Interface | TTL-Level Serial Peripheral Multiplexer |
Use Scenario: Interfacing ISA-bus-compatible peripherals to modern embedded host via passive backplane wiring. IC Role / Device Role / Timing Role: Level-translating and fanout buffer for 5V TTL control signals (IOR̅, IOW̅, MEMR̅). Use Value: Matches 74LS input loading while driving 20+ TTL inputs per output, reducing board-level component count. | Use Scenario: Selectively routing UART or SPI signals from one master to multiple slave devices in test equipment racks. IC Role / Device Role / Timing Role: Logic-controlled signal path selector using OE pins as channel gate signals. Use Value: Dual-channel architecture allows time-multiplexed access to two independent peripheral groups without signal crosstalk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 8-bit buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS2541N | Same ALS logic, identical electrical specs, but in 20-pin PDIP (N) package with through-hole mounting. | Requires wave-solder or manual assembly; unsuitable for surface-mount production or space-constrained layouts. | Select SN74ALS2541N only for prototyping, repair, or legacy through-hole systems where SOIC footprint is unavailable. |
| SN74AS2541DW | Faster propagation delay (7ns typ), higher power consumption (30mA ICC), same SOIC-DW package and pinout. | Better suited for >50MHz bus timing but increases thermal load and supply current in battery-powered or thermally constrained designs. | Choose SN74AS2541DW when speed is critical and power budget allows; otherwise SN74ALS2541DW offers optimal balance for 25–40MHz systems. |
Compared with SN74ALS2541N and SN74AS2541DW, the SN74ALS2541DW delivers the best compromise of speed, power, and surface-mount manufacturability for mid-speed 5V TTL bus interfaces-neither requiring through-hole assembly nor demanding excessive supply current.
Availability
SN74ALS2541DW is available at Aetrix Electronics and suitable for industrial control backplanes, legacy microprocessor upgrades, and 5V TTL-based test instrumentation requiring stable component supply despite its obsolete status.
Supply support for SN74ALS2541DW 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 company headquartered in Dallas, Texas, delivering analog, embedded processing, and logic solutions since 1930.
The SN74ALS2541DW belongs to TI's legacy 74ALS logic family, engineered specifically for high-reliability, medium-speed 5V digital systems where power efficiency and TTL compatibility were prioritized over maximum frequency.
FAQ
What is the operating temperature range for SN74ALS2541DW?
The SN74ALS2541DW is specified for commercial temperature operation from 0°C to +70°C. This range aligns with standard TTL logic requirements and supports use in office equipment, industrial panels, and non-extreme-environment embedded systems. The device does not carry extended (–40°C to +85°C) or military-grade temperature ratings. Always verify ambient thermal conditions in final layout to ensure junction temperature remains within safe limits.
Does SN74ALS2541DW support hot-swapping or live insertion?
No, SN74ALS2541DW does not support hot-swapping. Its bipolar ALS process lacks built-in bus-hold or power-up/down protection circuitry, and applying signal voltages before VCC stabilization may cause latch-up or parametric shift. For hot-swap applications, consider newer logic families with Ioff or power-off protection, or implement external current-limiting and sequencing circuitry when integrating SN74ALS2541DW into modular backplanes.
Is SN74ALS2541DW pin-compatible with SN74LS244 or SN74F244?
Yes, SN74ALS2541DW is functionally and pin-compatible with SN74LS244 and SN74F244 in the 20-pin SOIC-DW package, sharing identical pin assignments for inputs, outputs, OE, VCC, and GND. However, SN74ALS2541DW offers improved speed (15ns vs 20ns for LS, 10ns for F) and lower ICC than LS, making it a direct upgrade path where ALS logic thresholds and drive strength are acceptable.
What is the maximum capacitive load SN74ALS2541DW can drive reliably?
SN74ALS2541DW is characterized for CL = 50pF in timing specifications, and its ±24mA output drive supports stable operation into ≤100pF total load capacitance-including PCB trace, stubs, and input capacitance of downstream devices-while maintaining 15ns propagation delay and valid VOH/VOL levels. Exceeding 100pF may increase delay and degrade noise margins; add series termination or reduce fanout if measured load exceeds this value.
Why is SN74ALS2541DW marked as OBSOLETE while SN74ALS2541DWR is ACTIVE?
SN74ALS2541DW is marked OBSOLETE because Texas Instruments discontinued the tube-packaged version (DW), whereas SN74ALS2541DWR-the tape-and-reel variant of the same SOIC-DW device-is still actively manufactured and stocked for automated SMT production. Both share identical die, electrical specs, and package dimensions; only packaging format and ordering part number differ. Customers should specify DWR, DWRG4, or NSR variants for new designs.
SN74ALS2541DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 400µA, 12mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ALS2541DW FAQ
1.How can I place an order for SN74ALS2541DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS2541DW 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 SN74ALS2541DW reliable?
The price and inventory of SN74ALS2541DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS2541DW is usually 5 days.
3.What payment methods are accepted for SN74ALS2541DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS2541DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS2541DW?
SN74ALS2541DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS2541DW 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 SN74ALS2541DW?
For technical support, including SN74ALS2541DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS2541DW requirements.
6.How does Aetrix verify that SN74ALS2541DW is sourced from the original manufacturer or authorized distributors?
All SN74ALS2541DW 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 SN74ALS2541DW meets industry standards.
7.What is the process for return or replacement of SN74ALS2541DW?
All SN74ALS2541DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS2541DW, 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 SN74ALS2541DW part is unused and in its original packaging.
Return procedure for SN74ALS2541DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ALS2541DW Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
