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Texas Instruments SN74LS241N
- Part No.:
- SN74LS241N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74LS241N.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:199
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Product details
Overview
SN74LS241N from Texas Instruments is an octal non-inverting buffer/line driver with dual 4-bit channels, 3-state outputs, and active-low output-enable (G) inputs. It operates at 5 V, delivers 24 mA sink current per output, achieves 18 ns max propagation delay, and features PNP inputs with 400-mV noise margin. It is used in memory address bus buffering and terminated line driving down to 133 Ω.
For engineers reviewing the SN74LS241N datasheet, SN74LS241N pinout, SN74LS241N application, or SN74LS241N equivalent, key selection criteria include 3-state bus-driving capability, dual independent channel control, TTL-compatible input thresholds, DC loading reduction via PNP inputs, and compatibility with mixed 3.3-V/5-V logic systems.
Technical Context
The SN74LS241N implements two independent 4-bit non-inverting buffer channels (Channel 1: 1A1–1A4 → 1Y1–1Y4; Channel 2: 2A1–2A4 → 2Y1–2Y4), each controlled by its own active-low output-enable input (1G and 2G). Outputs enter high-impedance state when respective G is high.
It uses Schottky TTL (LS) technology with PNP input stages to reduce DC loading on source buses and built-in input hysteresis (0.2–0.4 V) to improve noise immunity. Input tolerance down to 2 V enables interfacing with 3.3-V logic while powered from 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - ensures stable operation within commercial-grade 5-V rail tolerances |
| Max Propagation Delay | 18 ns at VCC = 5 V, CL = 45 pF - supports reliable timing in memory address and control bus applications |
| Output Sink Current | 24 mA per output - drives standard TTL loads and terminated lines (e.g., 133 Ω) |
| Input Hysteresis | 0.2–0.4 V - increases noise margin on shared bus lines subject to crosstalk or EMI |
| 3-State Leakage | ±20 µA - minimizes bus contention current when outputs are disabled |
| Input Voltage Range | Tolerates inputs down to 2 V - enables direct interface with 3.3-V logic without level shifters |
| Quiescent ICC (Outputs Disabled) | 32–54 mA - reflects LS-family static power consumption during bus isolation |
Pinout & Package
SN74LS241N is supplied in a 20-pin plastic dual in-line package (PDIP-N), with 2.54 mm pitch, 24.33 mm × 6.35 mm body size, and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1G / 2G | Active-low output-enable for Channel 1 / Channel 2 - controls high-impedance state independently |
| 2, 4, 6, 8, 11, 13, 15, 17 | 1A1–1A4 / 2A1–2A4 | Non-inverting data inputs - accept TTL/LS logic levels; PNP structure reduces bus loading |
| 3, 5, 7, 9, 12, 14, 16, 18 | 2Y4–2Y1 / 1Y4–1Y1 | Non-inverting 3-state outputs - drive bus lines directly; high-Z when corresponding G = HIGH |
| 10 | GND | Ground reference - required for biasing PNP inputs and output stage operation |
| 20 | VCC | +5 V supply - powers internal logic and output drivers; decoupling capacitor recommended |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit channels | Enables separate control of two data paths (e.g., address vs. control bus) without external gating |
| PNP input structure | Reduces DC input current to ≤0.2 mA - lowers loading on upstream drivers and improves fan-out |
| Input hysteresis (0.2–0.4 V) | Increases effective noise margin by >100 mV - suppresses false triggering on noisy backplanes or long traces |
| 3-state output control | Allows bidirectional bus sharing and hot-swap isolation - critical for memory address register expansion |
| 2-V minimum input tolerance | Supports direct connection to 3.3-V microcontrollers or FPGAs - eliminates discrete level-shifting components |
Applications
| Memory Address Buffering | LED Display Multiplexing |
|---|---|
Use Scenario: Driving 16-bit memory address lines from a CPU or address latch across a PCB with trace lengths >10 cm. IC Role / Device Role / Timing Role: Non-inverting octal buffer with dual-channel enable - isolates address generation logic and strengthens signal integrity for parallel memory access. Use Value: 24 mA output drive and 18 ns tPHL/tPLH ensure setup/hold timing margins are maintained even with capacitive loading up to 45 pF. | Use Scenario: Scanning 8-digit, 7-segment LED displays using multiplexed column drivers and row sinks. IC Role / Device Role / Timing Role: 3-state non-inverting buffer - enables dynamic column selection while preventing ghosting via precise output disable timing. Use Value: Independent 1G/2G control allows interleaved enable/disable of digit groups, reducing average current and improving display brightness uniformity. |
| Network Switch Backplane Interface | Industrial I/O Expander |
Use Scenario: Interfacing multiple ASICs or PHYs to a shared control bus in a 1U network switch chassis. IC Role / Device Role / Timing Role: Bus line driver with high noise margin - buffers configuration registers and status signals across noisy backplane environments. Use Value: 400-mV noise margin and hysteresis suppress coupling from adjacent high-speed SerDes lanes, ensuring reliable register reads/writes. | Use Scenario: Extending GPIO count of a PLC controller to manage relay banks, sensor inputs, and indicator LEDs. IC Role / Device Role / Timing Role: Octal buffer with 3-state outputs - provides isolated, high-drive digital I/O expansion with software-controllable direction per channel pair. Use Value: Dual 4-bit channels allow simultaneous read/write of two I/O groups, improving scan cycle efficiency in real-time control loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal non-inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS244N | Non-inverting octal buffer with identical pinout and electrical specs; differs only in internal logic mapping (no inversion vs. SN74LS240's inversion) | Same use cases; no functional difference for non-inverting bus driving | Select SN74LS244N if sourcing from same family batch or requiring documented drop-in replacement in legacy designs |
| SN74ALS241N | Advanced LS variant: lower ICC (19 mA disabled), faster tPLH/tPHL (15 ns typ), improved VIH/VIL thresholds | Better suited for high-density, low-power boards where thermal budget or timing margin is constrained | Choose SN74ALS241N for new designs targeting reduced power or tighter timing; verify layout compatibility due to same PDIP-20 footprint |
Compared with SN74LS244N, SN74LS241N offers identical functionality but is explicitly designated for dual-channel independent control; versus SN74ALS241N, it trades higher ICC and slower speed for broader legacy system compatibility and proven field reliability.
Availability
SN74LS241N is available at Aetrix Electronics and suitable for memory address buffering, LED display multiplexing, network switch backplane interfaces, and industrial I/O expanders requiring stable component supply over extended production lifecycles.
Supply support for SN74LS241N 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
SN74LS241N belongs to TI's legacy TTL logic product line, engineered for robust bus interfacing in industrial control, computing, and telecom infrastructure where reliability and long-term availability are critical.
FAQ
What is the function of pins 1 and 19 on the SN74LS241N?
Pins 1 and 19 are the active-low output-enable inputs 1G and 2G, respectively. When pulled LOW, they enable the corresponding 4-bit channel (1A→1Y or 2A→2Y); when HIGH, outputs go high-impedance. For reliable power-up behavior, TI recommends pulling both to VCC via pullup resistors.
Can SN74LS241N interface directly with 3.3-V logic inputs?
Yes. The SN74LS241N accepts input voltages as low as 2 V while operating at 5 V, making it compatible with 3.3-V CMOS and TTL outputs without external level shifters. Its input hysteresis further enhances noise immunity in mixed-voltage systems.
What is the maximum capacitive load SN74LS241N can drive while maintaining timing specs?
The SN74LS241N's switching characteristics (e.g., 18 ns max tPLH/tPHL) are specified at CL = 45 pF. Driving heavier loads (>60 pF) increases propagation delay and may cause ringing; for such cases, TI recommends series termination or reducing trace length to maintain signal integrity.
How does the PNP input structure benefit system design with SN74LS241N?
The PNP input stage reduces DC input current to ≤0.2 mA, lowering loading on upstream drivers and increasing fan-out capability. This allows one SN74LS241N input to drive multiple downstream LS inputs without exceeding current limits, simplifying bus topology design.
Is SN74LS241N suitable for driving terminated transmission lines?
Yes. The SN74LS241N is characterized to drive terminated lines down to 133 Ω, supporting reliable signal transmission over longer PCB traces or backplane interconnects. TI specifies this capability under Recommended Operating Conditions with proper VCC regulation and ground plane design.
SN74LS241N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- 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, 24mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74LS241N FAQ
1.How can I place an order for SN74LS241N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS241N 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 SN74LS241N reliable?
The price and inventory of SN74LS241N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS241N is usually 5 days.
3.What payment methods are accepted for SN74LS241N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS241N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS241N?
SN74LS241N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS241N 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 SN74LS241N?
For technical support, including SN74LS241N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS241N requirements.
6.How does Aetrix verify that SN74LS241N is sourced from the original manufacturer or authorized distributors?
All SN74LS241N 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 SN74LS241N meets industry standards.
7.What is the process for return or replacement of SN74LS241N?
All SN74LS241N units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS241N, 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 SN74LS241N part is unused and in its original packaging.
Return procedure for SN74LS241N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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