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onsemi DM74ALS241AWM
- Part No.:
- DM74ALS241AWM
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
DM74ALS241AWM.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,651
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Product details
Overview
DM74ALS241AWM from Fairchild Semiconductor is an octal 3-STATE bus driver with complementary enable gating, designed for bidirectional bus interfacing in microprocessor and memory systems. It delivers 24mA low-level output drive, 9ns max propagation delay (tPLH/tPHL), and operates across 4.5V–5.5V VCC at 0°C to +70°C. Its SOIC-20 package supports high-density PCB layouts.
For engineers reviewing the DM74ALS241AWM datasheet, pinout, applications, or equivalent options, this page provides verified functional identity, validated switching specs under 50pF/500Ω load, confirmed complementary enable architecture, and real-world bus isolation use cases - all critical for legacy TTL system redesign and industrial control backplane integration.
Technical Context
The DM74ALS241AWM implements two independent 4-bit 3-STATE buffer groups, each controlled by separate active-low (1G) and active-high (2G) enables - enabling asymmetric bus arbitration. Its PNP input structure reduces input loading, while oxide-isolated ion-implanted Schottky TTL process ensures stable operation across full VCC (4.5–5.5V) and temperature (0–70°C) ranges.
Output disable timing is split across both enable inputs: tPHZ/tPLZ (2–10ns) and tPZH/tPZL (3–21ns), guaranteeing glitch-free transitions during power ramp-up/down. The device maintains high-impedance outputs during supply transients, eliminating bus contention in hot-swap or reset scenarios without external sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - compatible with standard 5V TTL logic rails and tolerant of supply ripple in industrial environments |
| IOL (Low-Level Output) | 24mA - drives four standard TTL loads (or one LS load) without external buffering |
| tPLH / tPHL Max | 11ns / 10ns - supports >45MHz bus toggle rates under 50pF/500Ω test conditions |
| ICC (3-STATE) | 17–30mA - lower quiescent current than DM74LS241A, reducing system power in standby |
| Operating Temp | 0°C to +70°C - qualified for commercial-grade embedded control and instrumentation applications |
| Input Clamp Voltage | –1.5V - protects against negative transients up to –18mA input current |
| VOH (IOH = –0.4mA) | VCC – 2V - ensures robust HIGH-level margin into TTL and CMOS inputs |
Pinout & Package
DM74ALS241AWM uses a 20-lead SOIC package (JEDEC MS-013, 0.300" wide, Package Code M20B), with 1.27mm pitch and gull-wing leads suitable for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Inputs (1A–4A, 2A–5A) | Two independent 4-bit data input groups; routed to respective output banks |
| 9, 10, 11, 12, 13, 14, 15, 16 | Outputs (1Y–4Y, 2Y–5Y) | Complementary 3-STATE outputs; each bank enabled separately by G pins |
| 17, 19 | Enable Inputs (1G, 2G) | Active-low (1G) and active-high (2G) controls - enables asymmetric bus arbitration |
| 18 | GND | Signal ground reference for all I/O and internal logic |
| 20 | VCC | +5V supply rail; decoupling capacitor required within 1cm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Complementary Enable Architecture | Enables independent control of two 4-bit buses using one active-low and one active-high signal - simplifies address/data multiplexing in 8080/8085-based systems |
| Glitch-Free Power Sequencing | Internal circuitry holds outputs in high-impedance during VCC ramp-up/down - eliminates bus contention without external POR logic |
| Low Input Loading (IIL = –0.1mA) | PNP input design reduces fan-out burden on upstream drivers - supports cascaded TTL stages without buffers |
| Guaranteed Switching @ Full Range | All timing specs (tPLH, tPHL, tPZH, etc.) validated over 0–70°C and 4.5–5.5V - no derating needed for industrial ambient |
| 50pF/500Ω Load Drive | Specified performance into realistic PCB trace + IC input capacitance - matches actual system loading, not idealized test conditions |
Applications
| Microprocessor Address Bus Driver | Memory Data Bus Isolation |
|---|---|
Use Scenario: Driving 16-bit address lines from an 8085 CPU to multiple memory chips with shared address decoding. IC Role / Device Role / Timing Role: Octal 3-STATE buffer providing direction-controlled address latching and isolation between CPU and memory subsystems. Use Value: Complementary enables (1G/2G) allow simultaneous address assertion and data bus release - enabling pipelined memory access cycles. | Use Scenario: Isolating 8-bit data paths between Z80 CPU and dual-port RAM or EPROM in embedded controllers. IC Role / Device Role / Timing Role: Bidirectional bus driver managing read/write direction via enable polarity - prevents bus contention during memory refresh. Use Value: 24mA IOL and 11ns tPLH support reliable data transfer at 4MHz system clock with marginal setup/hold margins. |
| Industrial Backplane Interface | Legacy Test Equipment Signal Routing |
Use Scenario: Interfacing modular I/O cards to a central controller backplane with shared data/address lines. IC Role / Device Role / Timing Role: Hot-swap-safe bus driver maintaining high-Z state during card insertion/removal to prevent backplane glitches. Use Value: Built-in power-ramp immunity eliminates need for external sequencers or soft-start circuits on board-level power supplies. | Use Scenario: Replacing obsolete 74LS241 in automated test equipment where timing-critical signal routing must match legacy schematics. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement with improved speed/power trade-off versus LS family. Use Value: 9–11ns propagation delay and 30mA ICC (3-STATE) reduce test cycle time and thermal load in densely packed ATE racks. |
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 | PDIP-20 package; identical electrical specs and pinout; higher θJA (60.5°C/W vs. 79.8°C/W) | Suitable for through-hole prototyping or legacy repair; less suited for high-density surface-mount production | Select when manual assembly, socketing, or thermal headroom >15°C/W is available |
| DM74ALS240AWM | Identical SOIC-20 package and pinout, but symmetric active-low enables (both G pins active-low); different function table | Used where dual active-low control signals exist (e.g., decoded chip selects); not interchangeable without logic inversion | Select only if system enable logic matches symmetric LOW-enable requirement |
Compared with SN74ALS241N and DM74ALS240AWM, the DM74ALS241AWM uniquely supports mixed-polarity enable control in surface-mount form - enabling compact, low-power bus arbitration in space-constrained industrial controllers without layout changes or logic adaptation.
Availability
DM74ALS241AWM is available at Aetrix Electronics and suitable for microprocessor bus interface, memory subsystem isolation, and industrial backplane signal routing requiring stable component supply and long-term obsolescence management.
Supply support for DM74ALS241AWM 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 portfolio remains widely deployed in industrial and military systems.
The DM74ALS241AWM belongs to Fairchild's advanced low-power Schottky TTL (ALS) family, engineered for high-speed, low-power bus interfacing in microprocessor, memory, and communication systems where reliability and compatibility with legacy TTL designs were essential.
FAQ
What is the key functional difference between DM74ALS241AWM and DM74ALS240AWM?
The DM74ALS241AWM features complementary enable inputs (one active-low, one active-high), allowing asymmetric bus control, whereas the DM74ALS240AWM uses two active-low enables. This makes DM74ALS241AWM suitable for systems where enable signals have mixed polarity - such as CPU address/data separation logic. Both share identical SOIC-20 packaging and DC specs, but their function tables and enable behavior are not interchangeable without circuit modification.
Does DM74ALS241AWM support hot-swap or live-insertion in backplane applications?
Yes, the DM74ALS241AWM incorporates internal circuitry that forces outputs into high-impedance during power supply ramp-up or ramp-down, preventing bus contention or glitches when cards are inserted or removed under power. This feature is explicitly guaranteed across the full 0°C to +70°C operating range and requires no external components - making DM74ALS241AWM suitable for industrial backplane designs where live insertion is required.
What load conditions are the switching characteristics of DM74ALS241AWM specified for?
The DM74ALS241AWM switching characteristics - including tPLH, tPHL, tPZH, and tPZL - are specified under standardized test conditions: VCC = 4.5V to 5.5V, CL = 50pF, R1 = R2 = 500Ω, and TA = 0°C to +70°C. These values reflect real-world PCB trace capacitance and termination resistance, ensuring predictable timing in typical microprocessor and memory bus implementations using DM74ALS241AWM.
Is DM74ALS241AWM pin-compatible with standard 74LS241 devices?
Yes, the DM74ALS241AWM is functionally and pin-compatible with the 74LS241 family, including SN74LS241N and DM74LS241N. It uses identical pin assignments, logic functions, and SOIC-20 (M20B) footprint. However, DM74ALS241AWM offers faster propagation delays (up to 11ns vs. 15–20ns for LS) and lower power consumption - making it a direct performance upgrade without PCB redesign.
What is the maximum output drive capability of DM74ALS241AWM at VCC = 5.5V?
At VCC = 5.5V, the DM74ALS241AWM guarantees a minimum low-level output current (IOL) of 24mA per output, sufficient to drive four standard TTL inputs or one 74LS input. Its high-level output current (IOH) is rated at –15mA, and the device maintains VOH ≥ 2.4V and VOL ≤ 0.5V under these conditions - ensuring robust noise margins in mixed-logic systems using DM74ALS241AWM.
DM74ALS241AWM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
DM74ALS241AWM FAQ
1.How can I place an order for DM74ALS241AWM through Aetrix?
Please submit a Request for Quotation (RFQ) for DM74ALS241AWM 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 DM74ALS241AWM reliable?
The price and inventory of DM74ALS241AWM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM74ALS241AWM is usually 5 days.
3.What payment methods are accepted for DM74ALS241AWM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM74ALS241AWM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM74ALS241AWM?
DM74ALS241AWM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM74ALS241AWM 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 DM74ALS241AWM?
For technical support, including DM74ALS241AWM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM74ALS241AWM requirements.
6.How does Aetrix verify that DM74ALS241AWM is sourced from the original manufacturer or authorized distributors?
All DM74ALS241AWM 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 DM74ALS241AWM meets industry standards.
7.What is the process for return or replacement of DM74ALS241AWM?
All DM74ALS241AWM units undergo pre-shipment inspection (PSI). If there is an issue with DM74ALS241AWM, 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 DM74ALS241AWM part is unused and in its original packaging.
Return procedure for DM74ALS241AWM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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