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onsemi DM74ALS241AWMX
- Part No.:
- DM74ALS241AWMX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
DM74ALS241AWMX.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,514
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Product details
Overview
DM74ALS241AWMX from Fairchild Semiconductor is an octal 3-STATE bus driver with complementary enable gating, designed for bidirectional bus interfacing in memory and microprocessor systems. It delivers 24mA low-level output drive, operates over 4.5V–5.5V VCC, supports 0°C to +70°C ambient, and features propagation delays as low as 3ns (tPLH) into 50pF/500Ω loads.
For engineers reviewing the DM74ALS241AWMX datasheet, pinout, applications, or equivalent options, this page provides verified electrical specifications, SOIC-20 package details, functional truth table behavior, thermal resistance (79.8°C/W), and validated alternatives for legacy TTL bus interface redesigns.
Technical Context
The DM74ALS241AWMX implements two independent 4-bit 3-STATE buffer groups with complementary enable logic: 1G active-low enables outputs Y1–Y4 when 1A is asserted, while 2G active-low enables Y5–Y8. Its PNP input structure reduces input loading, and internal power-ramp protection holds outputs in high-impedance during VCC transitions.
It uses advanced low-power oxide-isolated ion-implanted Schottky TTL process, delivering improved speed–power trade-offs versus DM74LS241A-e.g., 3–11ns tPLH vs. typical LS 15ns-with guaranteed switching performance across full temperature and supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - Ensures compatibility with standard 5V TTL logic rails and noise margin stability |
| IOL / IOH | 24mA / –15mA - Supports direct driving of multiple TTL inputs or termination resistors without external buffers |
| tPLH / tPHL | 3ns / 3ns min (11ns / 10ns max) - Enables reliable operation in sub-20MHz bus cycles with controlled edge rates |
| IOZH / IOZL | ±20µA - Confirms high-impedance leakage remains negligible during 3-STATE, preventing bus contention |
| θJA | 79.8°C/W (SOIC-20) - Defines thermal derating limit for continuous operation at 25°C ambient with no heatsink |
| ICC (3-STATE) | 17–30mA - Quantifies quiescent power draw when all outputs disabled, critical for standby current budgeting |
Pinout & Package
DM74ALS241AWMX is housed in a 20-lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" wide (Package Number M20B), with 1.27mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Inputs A1–A8 | Asynchronous data inputs feeding respective output buffers; TTL-compatible voltage thresholds (VIL ≤ 0.8V, VIH ≥ 2.0V) |
| 9, 10, 11, 12, 13, 14, 15, 16 | Outputs Y1–Y8 | 3-STATE buffered outputs with active-drive and high-Z states; capable of sinking 24mA or sourcing 15mA |
| 17, 18 | Enable Inputs 1G, 2G | Complementary active-low enables: 1G controls Y1–Y4, 2G controls Y5–Y8; both must be LOW to activate respective group |
| 20 | VCC | Positive supply terminal - must be decoupled locally to suppress switching noise on shared 5V rail |
| 10 | GND | Ground reference - shared return path for all input/output currents; requires low-inductance connection |
Key Features
| Feature | Design Value |
|---|---|
| Complementary dual-enable architecture | Independent control of two 4-bit bus segments (Y1–Y4 and Y5–Y8) enables flexible half-bus arbitration without external logic |
| Power-ramp 3-STATE hold | Internal circuitry forces outputs into high-Z during VCC rise/fall, eliminating bus glitches in hot-swap or brown-out conditions |
| PNP input structure | Reduces input current loading to ±0.1mA max, allowing fan-out to >20 standard TTL loads per input |
| Guaranteed switching into 50pF/500Ω | Validated timing performance under realistic PCB trace + termination load, not just capacitive-only test conditions |
Applications
| Memory Address Bus Interface | Microprocessor Data Bus Isolation |
|---|---|
Use Scenario: Driving address lines between CPU and SRAM/ROM in 8-bit embedded controllers with multiplexed buses. IC Role / Device Role / Timing Role: Unidirectional level-shifting and fan-out buffer with precise enable timing to prevent address glitches during chip select transitions. Use Value: 3ns propagation delay ensures setup/hold timing margins are maintained at 12MHz bus clocks; 24mA drive sustains signal integrity across 6-inch traces. | Use Scenario: Isolating bidirectional data bus between Z80 CPU and peripheral I/O chips during DMA cycles. IC Role / Device Role / Timing Role: Direction-controlled bus transceiver using complementary enables (1G/2G) to separate read/write paths without direction pins. Use Value: Complementary enable logic allows one group to drive data out while the other enters high-Z, eliminating need for external direction logic or bus switches. |
| Legacy System Bus Expansion | Industrial Control Backplane Driver |
Use Scenario: Adding parallel I/O expansion slots to vintage industrial PLC backplanes using TTL-compatible signaling. IC Role / Device Role / Timing Role: Octal buffer providing impedance matching and noise immunity for multi-drop bus stubs up to 15cm long. Use Value: Guaranteed 50pF/500Ω load timing and ±20µA 3-STATE leakage ensure stable operation across temperature-varying factory environments. | Use Scenario: Interfacing microcontroller GPIOs to relay driver arrays and opto-isolators in DIN-rail mounted control modules. IC Role / Device Role / Timing Role: Current-boosting interface that translates low-drive MCU pins into robust 24mA sink capability for direct LED/relay coil drive. Use Value: Eliminates discrete transistor stages; 0.35V VOL at 24mA ensures <0.5V drop across 100Ω series resistors used for LED current limiting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-STATE bus driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS241N | Same ALS family, identical logic function and DC specs; PDIP-20 package only (no SOIC) | Requires through-hole PCB assembly; lacks SOIC thermal performance (θJA = 60.5°C/W vs. 79.8°C/W) | Select when legacy through-hole manufacturing or socket-based prototyping is required |
| 74F241SC | Fast TTL variant: faster tPLH (2.5ns typ), higher ICC (25mA typ in 3-STATE), no power-ramp hold feature | Higher power consumption and no inherent glitch suppression during power sequencing | Select only when maximum speed is prioritized over power and robustness in non-critical subsystems |
Compared with SN74ALS241N and 74F241SC, DM74ALS241AWMX uniquely balances low power (17–30mA ICC in 3-STATE), SOIC thermal efficiency, and built-in power-ramp safety-making it optimal for space-constrained, thermally managed, or hot-pluggable legacy designs.
Availability
DM74ALS241AWMX is available at Aetrix Electronics and suitable for memory interface, microprocessor bus isolation, and industrial backplane expansion requiring stable component supply and long-term obsolescence management.
Supply support for DM74ALS241AWMX 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy logic families remain widely supported.
The DM74ALS241AWMX belongs to the Advanced Low-Power Schottky (ALS) TTL logic family, engineered for high-speed, low-power bus interfacing in industrial and computing systems where reliability and backward compatibility with 74LS are essential.
FAQ
What is the key functional difference between DM74ALS241AWMX and DM74ALS240AWMX?
The DM74ALS241AWMX uses complementary enable gating: 1G and 2G are both active-low but control separate 4-bit output groups independently. In contrast, DM74ALS240AWMX has symmetrical enable logic where both enables must be low to activate their respective groups. This makes DM74ALS241AWMX better suited for asymmetric bus arbitration, such as separating read and write paths. The DM74ALS241AWMX also exhibits slightly longer enable/disable times (e.g., tPZH up to 21ns) due to its complementary architecture.
Does DM74ALS241AWMX support mixed-voltage interfacing, such as 3.3V inputs driving a 5V-powered device?
No, DM74ALS241AWMX is a 5V-only TTL device with VIH minimum of 2.0V and VIL maximum of 0.8V. While 3.3V logic may exceed VIH, it violates the absolute maximum input voltage rating of 7V only if clamped improperly-and more critically, lacks guaranteed noise margin or AC timing validation at 3.3V input levels. For mixed-voltage systems, level translators or 3.3V-tolerant buffers like 74LVC241 should be used instead of relying on DM74ALS241AWMX.
What is the significance of the "X" suffix in DM74ALS241AWMX?
The "X" suffix in DM74ALS241AWMX indicates tape-and-reel packaging per Fairchild's ordering convention-specifically, 2000 units per reel in SOIC-20 (M20B) format. This packaging supports automated SMT placement and is required for high-volume production. The "W" denotes the SOIC package; "M" is the package code suffix per Fairchild's nomenclature; "X" is the tape-and-reel indicator-not a revision or grade modifier.
Can DM74ALS241AWMX outputs safely drive a 50Ω transmission line directly?
No-DM74ALS241AWMX is not designed for 50Ω line driving. Its output structure targets 500Ω parallel loads with 50pF capacitance, per datasheet test conditions. Driving a 50Ω DC load would exceed its 24mA sink rating (requiring >100mA at 5V), causing excessive VOL rise, thermal stress, and potential latch-up. For 50Ω transmission lines, use purpose-built line drivers (e.g., SN65LVDS1) or add series termination resistors to match characteristic impedance while limiting current.
Is DM74ALS241AWMX RoHS compliant and lead-free?
DM74ALS241AWMX was manufactured prior to RoHS enforcement and is not inherently RoHS-compliant. Original Fairchild production used leaded solder and Pb-containing die attach. While some later second-source or re-marked versions may claim RoHS compliance, the authentic DM74ALS241AWMX part number-as documented in Rev. 1.3 (2007)-specifies no lead-free qualification. For new designs, consult ON Semiconductor's current equivalents or consider drop-in replacements like SN74ALS241D (SOIC, RoHS-compliant).
DM74ALS241AWMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- 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:
- 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
DM74ALS241AWMX FAQ
1.How can I place an order for DM74ALS241AWMX through Aetrix?
Please submit a Request for Quotation (RFQ) for DM74ALS241AWMX 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 DM74ALS241AWMX reliable?
The price and inventory of DM74ALS241AWMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM74ALS241AWMX is usually 5 days.
3.What payment methods are accepted for DM74ALS241AWMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM74ALS241AWMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM74ALS241AWMX?
DM74ALS241AWMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM74ALS241AWMX 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 DM74ALS241AWMX?
For technical support, including DM74ALS241AWMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM74ALS241AWMX requirements.
6.How does Aetrix verify that DM74ALS241AWMX is sourced from the original manufacturer or authorized distributors?
All DM74ALS241AWMX 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 DM74ALS241AWMX meets industry standards.
7.What is the process for return or replacement of DM74ALS241AWMX?
All DM74ALS241AWMX units undergo pre-shipment inspection (PSI). If there is an issue with DM74ALS241AWMX, 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 DM74ALS241AWMX part is unused and in its original packaging.
Return procedure for DM74ALS241AWMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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