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Texas Instruments SN74AS241AN
- Part No.:
- SN74AS241AN
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AS241AN.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,423
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Product details
Overview
SN74AS241AN from Texas Instruments is an octal 3-state noninverting buffer/driver IC designed for memory address and bus driving applications. It features dual independent output-enable (1OE, 2OE), 20-pin PDIP package, 0°C to 70°C operating temperature, 48 mA low-level output drive, and propagation delays as low as 2 ns (tPHL) at VCC = 4.5–5.5 V.
For engineers reviewing the SN74AS241AN datasheet, SN74AS241AN pinout, SN74AS241AN application, or SN74AS241AN equivalent, this page delivers verified electrical specs, functional role in bus buffering, thermal and timing behavior under load, and real-world substitution guidance for legacy TTL system upgrades.
Technical Context
This device implements two independent 4-bit noninverting buffer sections, each with dedicated active-low 3-state output-enable control (1OE and 2OE). Its AS-family bipolar transistor design delivers higher speed and stronger drive than ALS variants, with guaranteed 48 mA IOL and 64 mA short-circuit current capability.
Input structure uses pnp-based circuitry to reduce DC loading on upstream logic, while output stages support symmetrical enable timing (tPZH/tPLZ < 10.5 ns) and fast propagation (tPHL/tPLH ≤ 6.2 ns) into 50-pF loads. It operates strictly at 5 V nominal supply with VIH ≥ 2 V and VIL ≤ 0.8 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL/CMOS systems without regulation overhead. |
| IOL (Max) | 48 mA - Sustains robust bus driving into heavy capacitive or resistive loads without voltage droop. |
| tPHL / tPLH | 1 ns / 2 ns (min), 6.2 ns (max) - Enables high-speed address/data latching in memory subsystems up to ~160 MHz effective toggle rate. |
| VIH / VIL | 2.0 V / 0.8 V - Guarantees clean logic threshold margin against noise in industrial backplane environments. |
| ICC (Active) | 61 mA (typ), 90 mA (max) - Reflects AS-family's higher power-speed tradeoff versus ALS; requires appropriate thermal layout. |
| Operating Temp | 0°C to 70°C - Qualified for commercial-grade embedded control and instrumentation applications, not extended/military range. |
| Package | PDIP-20 (N) - Through-hole mounting compatible with legacy prototyping, repair, and industrial PCB assembly. |
Pinout & Package
SN74AS241AN uses a 20-pin plastic dual in-line package (PDIP-N) with 300-mil width and standard DIP footprint. Pin 1 is located at top-left corner (notch or dot marked), with pins numbered counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for Group 1 (pins 18,16,14,12) and Group 2 (pins 9,7,5,3) outputs. |
| 2,4,6,8 | 1A1–1A4 | Noninverting input signals for first 4-bit buffer group. |
| 3,5,7,9 | 2Y1–2Y4 | Noninverting 3-state outputs for second 4-bit buffer group. |
| 11,13,15,17 | 2A1–2A4 | Noninverting input signals for second 4-bit buffer group. |
| 12,14,16,18 | 1Y1–1Y4 | Noninverting 3-state outputs for first 4-bit buffer group. |
| 10 | GND | Power ground reference for all internal logic and output stages. |
| 20 | VCC | +5 V supply input; decoupling capacitor required within 1 cm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit buffers | Enables split-bus control-e.g., separate enable for address vs. data lines without external gating. |
| pnp input structure | Reduces DC input current to ≤ ±1 mA, minimizing loading on TTL/LS drivers and preserving fan-out integrity. |
| High-current 3-state outputs | 48 mA sink capability supports direct connection to terminated buses or multiple TTL inputs without external drivers. |
| Fast enable/disable timing | tPZH/tPLZ ≤ 9 ns ensures glitch-free bus sharing during dynamic enable transitions in multiplexed systems. |
| Standard 5 V TTL compatibility | VIH/VIL thresholds and VOH/VOL levels meet JEDEC 5 V TTL specifications for seamless integration. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microprocessor to multiple memory chips in a legacy 8086/8088-based system. IC Role / Device Role: Noninverting 3-state buffer isolating CPU address outputs and enabling memory chip select arbitration. Use Value: 48 mA drive strength prevents address skew across long traces; dual OE allows interleaved memory bank access. |
Use Scenario: Bidirectional data bus isolation between CPU and peripheral controllers using external direction control. IC Role / Device Role: Unidirectional buffer stage used in pairs (with complementary part) to construct controlled-direction transceivers. Use Value: Sub-10 ns enable/disable times minimize bus turnaround latency; pnp inputs reduce loading on shared data lines. |
| Clock Distribution | Industrial I/O Expansion |
|
Use Scenario: Fan-out of system clock signal to multiple synchronous peripherals (e.g., UARTs, timers) in PLC backplane. IC Role / Device Role: Low-skew, high-drive clock driver with 3-state capability for dynamic clock gating. Use Value: 2 ns tPHL/tPLH minimizes clock skew across 8 loads; 50 pF load rating matches typical trace + input capacitance. |
Use Scenario: Interfacing microcontroller GPIOs to high-current industrial sensors or relay drivers. IC Role / Device Role: Level-shifting and current-boosting buffer between low-power MCU outputs and 5 V logic-level actuators. Use Value: Guaranteed VOL ≤ 0.55 V at 64 mA ensures reliable low-state recognition by downstream 5 V TTL receivers. |
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 |
|---|---|---|---|
| SN74ALS241N | Lower drive (24 mA IOL), slower speed (11 ns max tPHL), reduced ICC (26 mA max). | Better suited for low-power, lower-frequency systems where fan-out > 20 is not required. | Select when thermal budget or static power is constrained and 48 mA drive is unnecessary. |
| SN74F241N | F-family: 35 mA IOL, 8 ns max tPHL, higher ICC (80 mA), no -1 version. | Offers intermediate speed/power balance; less robust drive than AS but faster than ALS. | Choose for cost-sensitive designs needing better speed than ALS without AS-level current demand. |
Compared with SN74ALS241N and SN74F241N, SN74AS241AN provides the highest output current and fastest propagation in the 74xx241 family, making it optimal for high-capacitance bus driving where timing margin is critical-but at the cost of higher supply current and thermal dissipation.
Availability
SN74AS241AN is available at Aetrix Electronics and suitable for memory subsystem design, industrial bus interfacing, and legacy system repair requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS241AN 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 for industrial, automotive, and communications markets.
SN74AS241AN belongs to TI's 74AS logic family-engineered for high-speed, high-drive 5 V TTL applications where propagation delay and output current outweigh power efficiency concerns.
FAQ
What is the maximum operating temperature for SN74AS241AN?
The SN74AS241AN is characterized for operation from 0°C to 70°C ambient temperature. It is not rated for extended industrial (−40°C to 85°C) or military (−55°C to 125°C) ranges. Operation outside 0°C–70°C may result in undefined timing, increased ICC, or output voltage violations. Always verify thermal derating in enclosed or high-airflow environments where SN74AS241AN junction temperature could exceed limits.
Does SN74AS241AN support 3.3 V logic inputs?
No, SN74AS241AN does not reliably accept 3.3 V logic inputs. Its VIH minimum is 2.0 V, but it is designed for 5 V TTL-compatible signaling. A 3.3 V high-level signal may fall below guaranteed VIH margin under process/voltage/temperature variation, risking misinterpretation as a logic low. For mixed-voltage systems, use level-shifting circuitry or a 3.3 V–tolerant buffer before SN74AS241AN inputs.
Can SN74AS241AN replace SN74ALS241N in an existing design?
SN74AS241AN is pin-compatible and functionally identical to SN74ALS241N, but with higher drive (48 mA vs. 24 mA) and faster timing (6.2 ns vs. 11 ns max tPHL). Replacement is electrically safe if board layout accommodates higher ICC (up to 90 mA) and thermal rise. Verify that downstream loads tolerate lower VOL (0.55 V vs. 0.4 V) and that enable timing margins remain sufficient.
What is the purpose of the pnp input structure in SN74AS241AN?
The pnp input structure in SN74AS241AN reduces DC input current to ≤ ±1 mA, significantly lowering loading on upstream drivers compared to standard TTL inputs. This preserves fan-out capability-e.g., one 74AS04 inverter can drive up to 20 SN74AS241AN inputs-making it ideal for dense bus architectures where signal integrity and drive capacity are critical.
Is SN74AS241AN RoHS compliant?
Yes, SN74AS241AN is RoHS compliant per TI's packaging addendum: it uses NiPdAu (NIPDAU) lead finish, has "Yes" RoHS status, and meets JEDEC MSL Level-1 reflow requirements. The PDIP (N) package contains no leaded solder; full compliance documentation is available via TI's Quality & Environmental page using orderable part number SN74AS241AN.
SN74AS241AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74AS241AN FAQ
1.How can I place an order for SN74AS241AN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS241AN 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 SN74AS241AN reliable?
The price and inventory of SN74AS241AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS241AN is usually 5 days.
3.What payment methods are accepted for SN74AS241AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS241AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS241AN?
SN74AS241AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS241AN 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 SN74AS241AN?
For technical support, including SN74AS241AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS241AN requirements.
6.How does Aetrix verify that SN74AS241AN is sourced from the original manufacturer or authorized distributors?
All SN74AS241AN 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 SN74AS241AN meets industry standards.
7.What is the process for return or replacement of SN74AS241AN?
All SN74AS241AN units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS241AN, 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 SN74AS241AN part is unused and in its original packaging.
Return procedure for SN74AS241AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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