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Texas Instruments SN74ALS241CDWR
- Part No.:
- SN74ALS241CDWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS241CDWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:131
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Product details
Overview
SN74ALS241CDWR from Texas Instruments is an octal 3-state noninverting buffer/driver IC designed for memory address and bus driving applications. It features dual independent 4-bit channels, symmetrical active-low output-enable (OE) inputs, pnp input structure for reduced DC loading, 20-pin SOIC (DW) package, and operates from 0°C to 70°C with 4.5 V–5.5 V supply voltage.
For engineers reviewing the SN74ALS241CDWR datasheet, SN74ALS241CDWR pinout, SN74ALS241CDWR application, or SN74ALS241CDWR equivalent, this page delivers verified functional role, timing behavior, drive capability, thermal limits, and real-world interface compatibility - critical for legacy system maintenance, industrial control bus design, and TTL-compatible logic upgrades.
Technical Context
This device implements two independent 4-bit noninverting buffer sections, each with dedicated active-low output-enable control (1OE and 2OE). Each channel drives eight outputs in parallel with 3-state capability, enabling bidirectional bus arbitration without external logic.
The ALS (Advanced Low-Power Schottky) family architecture delivers improved fan-out (≥20 TTL loads), reduced input current (IIL ≤ −0.1 mA), and faster propagation delays (tPLH/tPHL ≤ 11 ns typical at 5 V) than standard LS logic, while maintaining full TTL voltage-level compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - ensures TTL-compatible voltage thresholds and lower power than standard LS. |
| Supply Voltage Range | 4.5 V to 5.5 V - supports stable operation across industrial-grade 5 V rail tolerances. |
| Output Drive (IOL) | 24 mA (standard version) - sufficient to drive 20+ TTL loads or terminate short PCB traces without external buffers. |
| Propagation Delay (tPLH/tPHL) | 2 ns to 11 ns (max) - enables reliable operation in 30+ MHz bus systems with tight setup/hold margins. |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial embedded control environments. |
| Input Structure | pnp-based inputs - reduces DC input loading (IIL ≤ −0.1 mA), minimizing bus contention current and power dissipation. |
| 3-State Enable Timing | tPZH/tPLZ ≤ 21 ns (max) - ensures clean bus release before next driver activation, preventing data bus contention. |
Pinout & Package
SN74ALS241CDWR uses a 20-pin SOIC (DW) package with 0.300-inch body width, 1.27 mm pitch, and 2.65 mm max height - compatible with standard surface-mount assembly processes and IPC-7351 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Channel 1 and Channel 2 - both must be low to enable respective outputs. |
| 2, 4, 6, 8 | 1A1–1A4 | Noninverting input signals for Channel 1 outputs (1Y1–1Y4). |
| 11, 13, 15, 17 | 2A1–2A4 | Noninverting input signals for Channel 2 outputs (2Y1–2Y4). |
| 18, 16, 14, 12 | 1Y1–1Y4 | 3-state noninverting buffered outputs for Channel 1 - high-impedance when 1OE = high. |
| 9, 7, 5, 3 | 2Y1–2Y4 | 3-state noninverting buffered outputs for Channel 2 - high-impedance when 2OE = high. |
| 10 | GND | Ground reference for all logic and output stages - requires low-inductance connection to minimize switching noise. |
| 20 | VCC | +5 V supply - must be decoupled locally with ≥0.1 µF ceramic capacitor near pin 20. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit channels | Enables separate control of two memory address or data bus segments using discrete OE signals - eliminates need for external gating logic. |
| pnp input structure | Reduces input current draw (IIL ≤ −0.1 mA), lowering total bus loading and improving signal integrity on shared address lines. |
| 3-state outputs with symmetrical enable | Supports time-multiplexed bus sharing between multiple drivers - fast disable (tPLZ ≤ 15 ns) prevents bus contention during state transitions. |
| ALS family speed-power balance | Delivers 11 ns max propagation delay with only 26 mA ICC (outputs low) - superior performance per mW vs. standard LS logic. |
| TTL-compatible voltage thresholds | VIH = 2.0 V min, VIL = 0.8 V max - ensures interoperability with legacy 74LS, 74F, and microcontroller GPIO without level-shifting. |
Applications
| Memory Address Buffering | Parallel Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microprocessor to multiple memory chips in industrial PLC backplane. IC Role / Device Role / Timing Role: Noninverting buffer with dual OE control isolates CPU address outputs and prevents contention during DMA cycles. Use Value: 24 mA drive strength ensures full logic swing across 10 cm daisy-chained traces; tPZH ≤ 21 ns guarantees clean bus release before next cycle. |
Use Scenario: Bidirectional data path between FPGA and legacy ISA-style peripheral card in test equipment rack. IC Role / Device Role / Timing Role: Dual-channel 3-state buffer manages direction control via separate OE lines synchronized to FPGA handshake signals. Use Value: Independent 1OE/2OE pins eliminate external AND gates; pnp inputs reduce FPGA I/O loading by >80% vs. standard LS drivers. |
| Clock Distribution Fan-Out | Legacy System Bus Isolation |
|
Use Scenario: Distributing 8 MHz system clock to four synchronous peripherals in avionics subsystem with strict skew control. IC Role / Device Role / Timing Role: Noninverting buffer stage providing matched delay paths and low-skew fan-out from single clock source. Use Value: Matched tPLH/tPHL (≤11 ns) and low output impedance (<10 Ω) minimize inter-channel skew (<1 ns) across all eight outputs. |
Use Scenario: Isolating aging 8086-based CPU bus from modern CPLD-based I/O controller in medical imaging upgrade. IC Role / Device Role / Timing Role: Level-translating buffer maintaining TTL logic levels while decoupling timing domains and fault propagation paths. Use Value: VIH/VIL compatibility ensures plug-and-play integration; 3-state capability allows hot-swap of I/O modules without CPU reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS241CN | Same ALS logic, identical electrical specs, but in 20-pin PDIP (N) package - no reflow compatibility. | Suitable for through-hole prototyping or legacy board repair where SOIC footprint unavailable. | Select SN74ALS241CN only when manual soldering or socket-based testing is required; not for automated SMT production. |
| SN74AS241AN | AS family variant: faster (tPLH ≤ 6.2 ns), higher drive (IOL = 64 mA), but higher ICC (90 mA) and stricter VIL (0.8 V). | Better for high-speed bus designs (>25 MHz) where timing margin is critical and power budget allows. | Choose SN74AS241AN only if propagation delay reduction justifies 3.5× higher supply current and tighter input threshold control. |
Compared with SN74ALS241CN, SN74ALS241CDWR offers SMT manufacturability and thermal performance; compared with SN74AS241AN, it trades speed for lower power and broader noise margin - making it optimal for cost-sensitive, medium-speed industrial control buses.
Availability
SN74ALS241CDWR is available at Aetrix Electronics and suitable for memory address buffering, parallel bus interfacing, clock distribution, and legacy system upgrades requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS241CDWR 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 with over 90 years of analog and logic innovation, serving automotive, industrial, and communications markets with high-reliability components.
SN74ALS241CDWR belongs to TI's legacy ALS logic family - engineered for robust TTL-compatible interfacing in industrial control, instrumentation, and military-grade systems where reliability and long-term availability are critical.
FAQ
What is the maximum output sink current for SN74ALS241CDWR?
The SN74ALS241CDWR supports a maximum low-level output current (IOL) of 24 mA per output under recommended operating conditions (VCC = 4.5 V–5.5 V, TA = 0°C to 70°C). This rating ensures reliable drive of up to 20 standard TTL loads without exceeding VOH/VOL specifications. The -1 version (not applicable to SN74ALS241CDWR) specifies 48 mA, but that variant is not offered in the DW package.
Does SN74ALS241CDWR support mixed-voltage operation (e.g., 3.3 V inputs)?
No, SN74ALS241CDWR is strictly a 5 V TTL-family device. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and output swing (VOH ≥ 2.4 V, VOL ≤ 0.4 V) are specified only for 4.5–5.5 V VCC operation. Direct connection to 3.3 V logic requires level-shifting circuitry; the device does not tolerate 3.3 V inputs as valid high or low without risk of undefined output states.
Can SN74ALS241CDWR replace SN74LS241 in existing designs?
Yes, SN74ALS241CDWR is a direct functional and pin-compatible replacement for SN74LS241 in SOIC packages, offering improved speed (11 ns vs. 15 ns max tPLH), lower input current (−0.1 mA vs. −0.4 mA IIL), and better noise immunity. No PCB changes are required, but verify VCC decoupling and bus termination remain adequate given the faster edge rates.
What is the thermal performance limit for continuous operation of SN74ALS241CDWR?
SN74ALS241CDWR is rated for continuous operation from 0°C to 70°C ambient temperature. Its SOIC (DW) package has a junction-to-ambient thermal resistance (θJA) of approximately 120°C/W. Under worst-case conditions (VCC = 5.5 V, all outputs sinking 24 mA), power dissipation remains below 250 mW - well within safe thermal limits without forced airflow or heatsinking.
Is SN74ALS241CDWR RoHS compliant and lead-free?
Yes, SN74ALS241CDWR is RoHS compliant with lead-free terminal finish (NiPdAu/NIPDAU) and meets JEDEC Level-1 moisture sensitivity standards (260°C peak reflow). The device ships in large tape-and-reel format (2000 units/reel) with Q1 pin-1 orientation, fully compatible with modern SMT assembly lines and environmental compliance requirements.
SN74ALS241CDWR 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:
- 2
- Number of Bits per Element:
- 4
- 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
SN74ALS241CDWR FAQ
1.How can I place an order for SN74ALS241CDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS241CDWR 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 SN74ALS241CDWR reliable?
The price and inventory of SN74ALS241CDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS241CDWR is usually 5 days.
3.What payment methods are accepted for SN74ALS241CDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS241CDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS241CDWR?
SN74ALS241CDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS241CDWR 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 SN74ALS241CDWR?
For technical support, including SN74ALS241CDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS241CDWR requirements.
6.How does Aetrix verify that SN74ALS241CDWR is sourced from the original manufacturer or authorized distributors?
All SN74ALS241CDWR 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 SN74ALS241CDWR meets industry standards.
7.What is the process for return or replacement of SN74ALS241CDWR?
All SN74ALS241CDWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS241CDWR, 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 SN74ALS241CDWR part is unused and in its original packaging.
Return procedure for SN74ALS241CDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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