My Inquiry
My Account
Texas Instruments SN74AS241ADW
- Part No.:
- SN74AS241ADW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AS241ADW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,589
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74AS241ADW 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 inputs (1OE, 2OE), symmetrical active-low control, 20-pin SOIC (DW) package, 0°C to 70°C operating temperature, and supports 48 mA low-level output current (IOL) at VCC = 4.5–5.5 V.
For engineers reviewing the SN74AS241ADW datasheet, SN74AS241ADW pinout, SN74AS241ADW application, or SN74AS241ADW equivalent, key selection criteria include 3-state bus-driving capability, TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V), fast propagation delays (tPLH/tPHL ≤ 6.2 ns), low enable/disable times (tPZH/tPLZ ≤ 9 ns), and compatibility with legacy 5-V TTL systems requiring high fan-out and noise-immune pnp-input structure.
Technical Context
This device implements two independent 4-bit noninverting buffer sections, each with dedicated active-low 3-state output-enable control (1OE for Y1–Y4, 2OE for Y5–Y8). Inputs use pnp-based TTL circuitry to reduce DC loading on upstream drivers, while outputs deliver rail-to-rail swing with guaranteed VOH ≥ 2.4 V (IOL = 48 mA) and VOL ≤ 0.55 V (IOL = 64 mA).
Its switching performance is characterized under 50-pF capacitive load with 500-Ω source termination, supporting high-speed bus interfacing in memory subsystems and address latching circuits. The SN74AS241A variant operates strictly within commercial temperature range (0°C to 70°C) and requires VCC between 4.5 V and 5.5 V for full specification compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across standard 5-V TTL power rails with ±10% tolerance. |
| Logic Family | AS (Advanced Schottky) - delivers faster speed and lower power than standard TTL or ALS variants. |
| IOL Output Current | 48 mA - enables direct drive of multiple TTL loads or terminated transmission lines without external buffers. |
| tPLH / tPHL | ≤ 6.2 ns - guarantees sub-7-ns signal propagation for high-frequency address/data bus timing budgets. |
| VOH / VOL | ≥ 2.4 V / ≤ 0.55 V - maintains robust noise margins (>0.4 V) when driving 10+ TTL inputs or 50-Ω transmission lines. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - fully compatible with standard TTL logic levels and immune to typical board-level noise. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control applications. |
Pinout & Package
SN74AS241ADW uses a 20-pin SOIC (DW) package with 0.300-inch body width, 1.27-mm lead pitch, and 2.65-mm maximum height. Pin 1 is marked by a beveled corner or notch indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output-enable controls for first and second 4-bit buffer groups - asserted low enables corresponding Y outputs. |
| 2, 4, 6, 8 | 1A1–1A4 | Noninverting inputs for first buffer group - directly pass A1–A4 to Y1–Y4 when 1OE = L. |
| 3, 5, 7, 9 | 2Y4–2Y1 | Inverted-order outputs of second buffer group - Y1 (pin 9) corresponds to 2A1 (pin 11), etc. |
| 11, 13, 15, 17 | 2A1–2A4 | Noninverting inputs for second buffer group - drive Y1–Y4 (pins 9, 7, 5, 3) when 2OE = L. |
| 12, 14, 16, 18 | 1Y1–1Y4 | Outputs of first buffer group - driven high/low per 1A1–1A4 when 1OE = L; high-impedance when 1OE = H. |
| 10 | GND | Ground reference for all internal circuitry and output stage return path. |
| 20 | VCC | +5 V supply for internal logic and output drivers - must be decoupled locally with 0.1-µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state control | Separate 1OE and 2OE pins allow selective enabling of two 4-bit data paths without inter-group contention. |
| pnp input structure | Reduces input DC loading to ≤ −1 mA (IIL), minimizing loading on preceding gate outputs or microcontroller pins. |
| AS-family speed-power balance | Delivers 6.2-ns max propagation delay with only 35 mA ICC (outputs low), outperforming ALS while consuming less power than F-series. |
| High-current 3-state outputs | Guaranteed 48 mA sink capability supports direct connection to heavily loaded buses or multiple TTL inputs without external drivers. |
| TTL-compatible voltage thresholds | VIH = 2 V and VIL = 0.8 V ensure reliable interfacing with legacy 5-V microcontrollers, FPGAs, and memory controllers. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a microprocessor to multiple SRAM or EPROM chips on a shared bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs from memory chip inputs; enables/disables per memory bank using OE signals. Use Value: Prevents bus contention during memory access arbitration; supports simultaneous read/write cycles across multiple devices via controlled output enable sequencing. |
Use Scenario: Bidirectional data bus isolation between a microcontroller and peripheral ICs sharing a common 8-bit data path. IC Role / Device Role / Timing Role: Unidirectional driver section (e.g., 1A→1Y) used in conjunction with complementary transceivers to manage direction-controlled data flow. Use Value: Eliminates need for complex bus arbitration logic by providing deterministic, low-latency enable-controlled drive capability with <6.2 ns propagation delay. |
| Clock Distribution Network | Legacy System Bus Expansion |
Use Scenario: Distributing a system clock signal to multiple synchronous peripherals while maintaining edge integrity and skew control. IC Role / Device Role / Timing Role: Low-skew, high-drive buffer replicating clock edges to multiple destinations with matched tPLH/tPHL characteristics. Use Value: Ensures setup/hold timing margins are preserved across all downstream devices; supports fan-out >10 without signal degradation. |
Use Scenario: Adding new I/O peripherals to an existing 5-V TTL-based industrial controller with fixed address/data bus architecture. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 74LS241 or 74ALS241 in legacy PCB designs requiring same pinout and electrical behavior. Use Value: Maintains backward compatibility with original layout and firmware while improving timing margin and noise immunity over older families. |
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 |
|---|---|---|---|
| SN74ALS241CDWR | ALS family: slower (tPLH ≤ 11 ns), lower IOL (24 mA), higher noise immunity but reduced speed. | Suitable for cost-sensitive, lower-speed systems where power efficiency and noise rejection outweigh speed needs. | Select SN74ALS241CDWR only if design tolerates ~80% longer propagation delay and does not require >24 mA sink current. |
| SN74F241N | F-family: faster (tPLH ≤ 5.5 ns) but higher ICC (up to 90 mA), no pnp input structure, higher input loading. | Better for ultra-high-speed timing-critical paths where power consumption and input loading are secondary concerns. | Choose SN74F241N only when absolute minimum propagation delay is required and board-level power delivery supports higher quiescent current. |
Compared with SN74ALS241CDWR and SN74F241N, SN74AS241ADW provides optimal balance of speed (6.2 ns), drive strength (48 mA), and input loading (−1 mA IIL), making it ideal for modernized 5-V TTL bus systems needing both performance and compatibility.
Availability
SN74AS241ADW is available at Aetrix Electronics and suitable for memory subsystems, industrial bus interfaces, and legacy system upgrades requiring stable component supply, long-term obsolescence management, and RoHS-compliant packaging.
Supply support for SN74AS241ADW 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 specializing in analog, embedded processing, and logic solutions with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74AS241ADW belongs to TI's legacy 74AS logic family, engineered specifically for high-speed, low-power 5-V TTL bus driving in memory addressing, clock distribution, and system expansion applications.
FAQ
What is the maximum operating frequency supported by SN74AS241ADW?
The SN74AS241ADW does not specify a maximum clock frequency in its datasheet because it is a combinational buffer-not a clocked device. Its usable frequency limit depends on propagation delay (≤6.2 ns) and load capacitance. For a 50-pF load, it reliably supports signal transitions up to approximately 80 MHz (based on 1/(2 × tPHL)), assuming clean edges and proper termination. Always verify timing in final PCB layout with actual trace capacitance and drive strength.
Can SN74AS241ADW replace SN74LS241 in an existing design?
Yes, SN74AS241ADW is a functional and pin-compatible upgrade for SN74LS241 in most 5-V TTL systems. It offers faster propagation (6.2 ns vs. 15–20 ns), higher output drive (48 mA vs. 8 mA), and lower input loading. However, confirm that the host system's power supply can support higher ICC (35 mA vs. ~25 mA) and that timing margins accommodate tighter enable/disable windows (tPZH ≤ 9 ns).
What is the meaning of "pnp inputs" in SN74AS241ADW datasheet?
The "pnp inputs" refer to the input-stage transistor configuration used in AS-family logic, which reduces DC input current-especially low-level input current (IIL ≤ −1 mA)-compared to standard TTL. This minimizes loading on upstream drivers like microcontroller GPIOs or other logic gates, preserving signal integrity and reducing cumulative fan-out limitations in dense bus architectures.
Does SN74AS241ADW support mixed-voltage interfacing, such as 3.3-V MCU inputs?
No, SN74AS241ADW is a 5-V-only device with TTL input thresholds (VIH = 2 V, VIL = 0.8 V) and no 3.3-V tolerant inputs. Driving it from a 3.3-V microcontroller may result in marginal or unreliable high-level recognition. Use a level-shifting buffer (e.g., TXB0108) or select a 3.3-V–compatible logic family if interfacing with sub-5-V controllers.
Is SN74AS241ADW still in active production and available for new designs?
Yes, SN74AS241ADW remains actively produced and stocked by Texas Instruments and authorized distributors. TI's official packaging addendum confirms SN74AS241ADW (as part of SN74AS241AN/SN74AS241ADW family) has active status, RoHS compliance, and standard SOIC-DW packaging with tape-and-reel (2000 pcs/reel) availability. Long-term supply is supported through TI's product longevity program.
SN74AS241ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- 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, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AS241ADW FAQ
1.How can I place an order for SN74AS241ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS241ADW 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 SN74AS241ADW reliable?
The price and inventory of SN74AS241ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS241ADW is usually 5 days.
3.What payment methods are accepted for SN74AS241ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS241ADW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS241ADW?
SN74AS241ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS241ADW 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 SN74AS241ADW?
For technical support, including SN74AS241ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS241ADW requirements.
6.How does Aetrix verify that SN74AS241ADW is sourced from the original manufacturer or authorized distributors?
All SN74AS241ADW 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 SN74AS241ADW meets industry standards.
7.What is the process for return or replacement of SN74AS241ADW?
All SN74AS241ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS241ADW, 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 SN74AS241ADW part is unused and in its original packaging.
Return procedure for SN74AS241ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74AS241ADW Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
