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Texas Instruments SN74ALS241C-1DW
- Part No.:
- SN74ALS241C-1DW
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ALS241C-1DW.pdf
- Description:
- BUS DRIVER, ALS SERIES
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Inventory:9,475
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Product details
Overview
SN74ALS241C-1DW from Texas Instruments is an octal 3-state noninverting buffer/driver IC designed for memory address and bus driving applications, featuring dual independent output-enable controls (1OE and 2OE), pnp input structure for reduced DC loading, and a guaranteed low-level output current of 48 mA per channel at VCC = 4.75–5.25 V. It operates across 0°C to 70°C and is packaged in a 20-pin SOIC (DW) format.
For engineers reviewing the SN74ALS241C-1DW datasheet, SN74ALS241C-1DW pinout, SN74ALS241C-1DW application, or SN74ALS241C-1DW equivalent, this page delivers verified electrical specs, functional timing behavior, package dimensions, real-world use cases in legacy computing and industrial control buses, and two validated alternative parts with documented functional and parametric differences.
Technical Context
This device implements two independent 4-bit noninverting buffer sections (1A1–1A4 → 1Y1–1Y4 and 2A1–2A4 → 2Y1–2Y4), each controlled by its own active-low 3-state enable input (1OE and 2OE). The ALS logic family provides improved speed-power trade-offs over standard TTL, with propagation delays as low as 2 ns (tPHL) and disable times down to 1 ns (tPHZ) under loaded conditions.
Its pnp input stage reduces input current draw (IIL ≤ −0.1 mA), while the -1 suffix denotes enhanced sink capability: IOL = 48 mA per output (vs. 24 mA in standard SN74ALS241C), enabling direct drive of heavier capacitive or resistive loads without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Low-Power Schottky (ALS), compatible with TTL voltage levels and drive requirements. |
| Supply Voltage (VCC) | 4.5 V to 5.5 V - supports stable operation across standard 5 V rail tolerances. |
| Output Drive (IOL) | 48 mA per channel (−1 version only) - enables direct interface to high-capacitance buses or multiple TTL inputs. |
| Propagation Delay (tPLH/tPHL) | 2–11 ns (A→Y) - ensures sub-10 ns signal routing critical for memory address strobing and clock distribution. |
| 3-State Enable/Disable Time | tPZH = 3 ns, tPLZ = 2 ns (1OE→Y) - guarantees fast bus arbitration and clean signal isolation during state transitions. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems and industrial control panels. |
| Input Structure | pnp-based inputs - limits input current to ≤ ±0.1 mA, reducing loading on upstream drivers and improving fan-in. |
Pinout & Package
SN74ALS241C-1DW is housed in a 20-pin plastic small-outline integrated circuit (SOIC) package (DW), measuring 12.8 mm × 7.5 mm × 2.65 mm max height, with 1.27 mm pitch and gull-wing leads. RoHS-compliant with NIPDAU lead finish and moisture sensitivity level (MSL) Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low 3-state enable inputs - independently disable outputs 1Y1–1Y4 or 2Y1–2Y4 to prevent bus contention. |
| 2, 4, 6, 8 | 1A1–1A4 | Noninverting input channels for first buffer group - directly connect to address/data lines requiring isolation. |
| 3, 5, 7, 9 | 2Y4–2Y1 | Inverted pin order for second output group - matches physical layout for PCB trace optimization in parallel bus routing. |
| 11, 13, 15, 17 | 2A1–2A4 | Noninverting inputs for second buffer group - supports dual-bus architectures (e.g., separate address and data paths). |
| 12, 14, 16, 18 | 1Y1–1Y4 | Noninverting outputs for first buffer group - deliver full 48 mA sink capability per pin in -1 version. |
| 10 | GND | Ground reference - must be low-impedance connection to minimize noise coupling into 3-state outputs. |
| 20 | VCC | +5 V supply - requires local 0.1 µF ceramic decoupling adjacent to pin to suppress switching transients. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state enables | Allows selective activation of two 4-bit output groups - essential for time-multiplexed bus sharing without external logic. |
| 48 mA output sink (−1 version) | Eliminates need for external driver stages when interfacing to legacy TTL loads or long PCB traces (>10 cm). |
| pnp input structure | Reduces input current to ≤ −0.1 mA - increases effective fan-in to >20 standard TTL loads per input. |
| ALS speed-power optimization | Delivers 2–11 ns propagation delay with ICC ≤ 26 mA (outputs low) - balances performance and thermal budget in dense layouts. |
| SOIC (DW) packaging | Enables surface-mount assembly with industry-standard footprint (JEDEC MS-013), supporting automated optical inspection and reflow. |
Applications
| Memory Address Buffering | Legacy Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 16-bit address bus in 1980s–1990s microprocessor systems (e.g., Z80, 8086) where multiple peripheral chips share address decoding. IC Role / Device Role / Timing Role: Noninverting buffer isolating CPU address lines from decoder inputs, with 3-state control synchronized to memory read/write cycles. Use Value: Prevents address bus contention during DMA or interrupt acknowledge cycles via precise OE timing (tPZH ≤ 3 ns). |
Use Scenario: Interfacing ISA or VMEbus backplane signals between dissimilar logic families (TTL ↔ LSTTL) with level-compatible drive strength. IC Role / Device Role / Timing Role: Bidirectional bus driver section enabling clean signal translation without added propagation skew. Use Value: 48 mA sink capability ensures reliable low-level assertion across 30 cm backplane traces with 50 pF load. |
| Industrial Control Panel I/O Expansion | EPROM Programming Adapter |
|
Use Scenario: Expanding GPIO count on PLC mainboards using discrete addressable latch + buffer combinations. IC Role / Device Role / Timing Role: Output driver stage for latched address/data bits controlling relay banks or LED arrays. Use Value: High fan-out (≥20 TTL loads) and low input current reduce loading on preceding latches, preserving setup/hold margins. |
Use Scenario: Providing controlled write-enable and address strobe buffering during parallel EPROM programming sequences. IC Role / Device Role / Timing Role: Timing-critical buffer for ALE or WE# signals requiring sub-10 ns edge fidelity and glitch-free enable transitions. Use Value: Fast disable time (tPLZ = 2 ns) prevents spurious writes during programmer state transitions. |
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 |
|---|---|---|---|
| SN74ALS241CN | Same ALS logic, identical function and pinout, but in 20-pin PDIP (N) package; IOL = 24 mA (non-−1 version). | Suitable for through-hole prototyping or legacy repair where SOIC assembly is unavailable. | Select SN74ALS241CN only if manual soldering or socket-based testing is required; not drop-in for DW footprint. |
| SN74AS241AN | AS-family variant: faster tPLH/tPHL (2–6.2 ns), higher IOL (64 mA), but increased ICC (up to 90 mA) and stricter VIH/VIL thresholds. | Better suited for high-speed timing-critical paths (e.g., cache coherency buses), but less tolerant of marginal input noise. | Choose SN74AS241AN only when propagation delay < 7 ns is mandatory and power budget allows ≥3× higher supply current. |
Compared with SN74ALS241C-1DW, SN74ALS241CN offers identical logic behavior in through-hole form but lacks the 48 mA drive strength, while SN74AS241AN delivers superior speed and drive at the cost of higher power and tighter input voltage margins - making SN74ALS241C-1DW the optimal balance for robust, moderate-speed bus buffering in commercial temperature environments.
Availability
SN74ALS241C-1DW is available at Aetrix Electronics and suitable for memory address buffering, legacy bus interface, industrial I/O expansion, and EPROM programming adapter designs requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS241C-1DW 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 deep heritage in TTL and advanced bipolar technologies.
The SN74ALS241C-1DW belongs to TI's legacy ALS logic product line, engineered specifically for high-density, low-power bus driving and memory address register buffering in commercial-grade computing and industrial control systems.
FAQ
What is the maximum output sink current specification for SN74ALS241C-1DW?
The SN74ALS241C-1DW is rated for a guaranteed low-level output current (IOL) of 48 mA per channel when VCC is maintained between 4.75 V and 5.25 V. This value is explicitly defined in the "Recommended Operating Conditions" table of the SDAS153E datasheet and distinguishes the -1 version from the standard SN74ALS241C (24 mA). Exceeding this limit risks output transistor degradation.
Does SN74ALS241C-1DW support mixed-voltage interfacing, such as 3.3 V inputs?
No - SN74ALS241C-1DW is a 5 V-only TTL-compatible device with VIH(min) = 2.0 V and VIL(max) = 0.8 V. It does not tolerate 3.3 V logic inputs reliably: a 3.3 V high signal falls below the minimum required VIH and may result in undefined output states. Level-shifting circuitry is required for interfacing with 3.3 V systems.
Is SN74ALS241C-1DW pin-compatible with SN74ALS241CDWR?
Yes - SN74ALS241C-1DW and SN74ALS241CDWR share identical pinout, function, and DW package dimensions. The "-1" suffix denotes the enhanced 48 mA IOL rating, while "DWR" indicates tape-and-reel packaging (2000 units); both are electrically and mechanically interchangeable in SOIC-20 footprints.
What is the purpose of the dual output-enable inputs (1OE and 2OE) on SN74ALS241C-1DW?
The dual active-low enables (1OE and 2OE) allow independent control of two separate 4-bit buffer groups: 1A1–1A4 → 1Y1–1Y4 and 2A1–2A4 → 2Y1–2Y4. This enables time-multiplexed bus access, isolated peripheral addressing, or fault-containment schemes - for example, disabling one group during diagnostics while keeping the other active in SN74ALS241C-1DW-based systems.
Can SN74ALS241C-1DW operate at 4.0 V supply voltage?
No - the absolute minimum recommended VCC is 4.5 V per the "Recommended Operating Conditions" table. At 4.0 V, VOH may fall below 2.0 V (VIH threshold of downstream TTL devices), VOL may exceed 0.5 V, and timing parameters (e.g., tPLH) will degrade beyond specification. Operation below 4.5 V is outside qualification and risks functional failure.
SN74ALS241C-1DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74ALS241C-1DW FAQ
1.How can I place an order for SN74ALS241C-1DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS241C-1DW 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 SN74ALS241C-1DW reliable?
The price and inventory of SN74ALS241C-1DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS241C-1DW is usually 5 days.
3.What payment methods are accepted for SN74ALS241C-1DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS241C-1DW transactions.
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4.How is shipping managed for SN74ALS241C-1DW?
SN74ALS241C-1DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS241C-1DW 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 SN74ALS241C-1DW?
For technical support, including SN74ALS241C-1DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS241C-1DW requirements.
6.How does Aetrix verify that SN74ALS241C-1DW is sourced from the original manufacturer or authorized distributors?
All SN74ALS241C-1DW 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 SN74ALS241C-1DW meets industry standards.
7.What is the process for return or replacement of SN74ALS241C-1DW?
All SN74ALS241C-1DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS241C-1DW, 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 SN74ALS241C-1DW part is unused and in its original packaging.
Return procedure for SN74ALS241C-1DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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