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Texas Instruments SN74LS241DW
- Part No.:
- SN74LS241DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LS241DW.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:324
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Product details
Overview
SN74LS241DW from Texas Instruments is an octal non-inverting 3-state line driver with dual independent 4-bit channels, designed for memory address and bus driving applications. It features 15 ns maximum propagation delay at 5 V, ±24 mA output drive capability, hysteresis-enhanced noise margins (0.4 V typical), and PNP input structure reducing DC loading on source buses.
For engineers reviewing the SN74LS241DW datasheet, SN74LS241DW pinout, SN74LS241DW application, or SN74LS241DW equivalent, this device is selected for high-reliability bus buffering in legacy TTL systems, terminated-line driving down to 133 Ω, and mixed-voltage interface translation between 3.3-V and 5-V logic domains.
Technical Context
The SN74LS241DW implements two independent 4-bit non-inverting buffer sections, each with active-low output-enable (1G and 2G) controlling high-impedance state. Its Schottky-clamped TTL architecture delivers fast switching (tPLH/tPHL ≤18 ns) while maintaining compatibility with standard LS logic thresholds.
Each channel supports separate enable control, enabling bidirectional bus isolation and time-multiplexed data routing. Inputs tolerate down to 2 V, allowing direct interfacing with 3.3-V CMOS outputs without level shifters, and built-in hysteresis (0.4 V typical VT+ − VT−) improves immunity to slow-rising or noisy signals on long traces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures compatibility with legacy 74LS systems and predictable fan-out behavior |
| Propagation Delay (tPD) | 12–18 ns max - enables reliable operation in 20-MHz memory address bus timing budgets |
| Output Drive (IOL/IOH) | 24 mA sink / –15 mA source - sufficient to drive 133-Ω terminated lines or multiple LS loads |
| Noise Margin (Hysteresis) | 0.4 V typical (VT+ − VT−) - increases robustness against crosstalk and ground bounce on shared PCB traces |
| Input Voltage Tolerance | Down to 2 V VIH - allows direct connection to 3.3-V microcontrollers without external level-shifting circuitry |
| Supply Voltage Range | 4.75 V to 5.25 V - tight regulation requirement ensures stable VOH/VOL performance across industrial temperature range |
| Thermal Resistance (RθJA) | 90.3 °C/W (SOIC DW package) - defines maximum power dissipation limit under natural convection cooling |
Pinout & Package
SN74LS241DW is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, optimized for surface-mount assembly and thermal performance in dense board layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1G / 2G | Active-low output-enable inputs - assert low to enable respective 4-bit channel; tied to VCC via pullup for power-up high-Z safety |
| 2, 4, 6, 8 | 1A1–1A4 | Channel 1 data inputs - non-inverting inputs feeding Y-side outputs 1Y1–1Y4 (pins 18, 16, 14, 12) |
| 11, 13, 15, 17 | 2A1–2A4 | Channel 2 data inputs - non-inverting inputs feeding Y-side outputs 2Y1–2Y4 (pins 9, 7, 5, 3) |
| 12, 14, 16, 18 | 1Y1–1Y4 | Channel 1 buffered non-inverting outputs - 3-state, capable of sourcing/sinking up to 24 mA |
| 3, 5, 7, 9 | 2Y1–2Y4 | Channel 2 buffered non-inverting outputs - electrically identical to 1Yx, independently controlled by 2G |
| 10 | GND | Ground reference - must be low-impedance connection to minimize switching noise coupling |
| 20 | VCC | +5 V supply - requires local 0.1 µF ceramic decoupling adjacent to pin to suppress high-frequency transients |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit non-inverting buffers | Enables simultaneous or time-multiplexed control of two separate data paths (e.g., address vs. data bus segments) |
| 3-state outputs with separate enables | Allows safe bus sharing among multiple drivers without contention; eliminates need for external bus arbitration logic |
| PNP input structure | Reduces DC input current to ≤0.2 mA (IIL), minimizing loading on upstream drivers and improving fan-in capability |
| Hysteresis on all inputs | Provides 400 mV noise margin - critical for reliable operation on long, unterminated PCB traces or noisy industrial environments |
| 3.3-V/5-V mixed-voltage compatibility | Accepts 2 V minimum VIH - permits direct interface with modern low-voltage microcontrollers in retrofitted legacy systems |
Applications
| Memory Address Buffering | LED Display Row Drivers |
|---|---|
|
Use Scenario: Driving 16-bit memory address bus in industrial PLC controller with 100-mm trace lengths and shared ground plane. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer isolating CPU address outputs from DRAM address inputs; enables clean edge transmission and prevents bus contention during DMA cycles. Use Value: 18 ns max tPD ensures setup/hold timing compliance; 24 mA IOL drives capacitive load of 150 pF + 133 Ω termination without signal degradation. |
Use Scenario: Controlling common-anode 8×8 LED matrix rows in telecom status panel operating at 1 kHz multiplex rate. IC Role / Device Role / Timing Role: High-current row driver translating 3.3-V FPGA GPIO outputs to 5-V LED supply rail; 3-state enables dynamic row blanking. Use Value: PNP inputs reduce FPGA I/O loading; hysteresis rejects EMI from adjacent relay coils; 24 mA per output sustains 20 mA LED current with margin. |
| Network Switch Backplane Interface | Motor Driver Enable Logic |
|
Use Scenario: Level-shifting and bus-driving between 3.3-V packet processor ASIC and 5-V backplane transceivers in enterprise switch chassis. IC Role / Device Role / Timing Role: Voltage-tolerant bus repeater ensuring signal integrity across 15-cm backplane traces; dual enables support hot-swap sequencing. Use Value: 2 V VIH tolerance eliminates level-shifters; 15 ns tPD meets 50 MHz backplane clock domain; RθJA = 90.3 °C/W supports 0–70°C ambient operation. |
Use Scenario: Isolating microcontroller GPIOs from H-bridge gate-driver enable inputs in servo amplifier with 48 V DC bus and PWM switching noise. IC Role / Device Role / Timing Role: Noise-immune buffer converting logic-level enable signals to robust 5-V control lines; 3-state supports safe fault shutdown. Use Value: 0.4 V hysteresis rejects 200 mV peak-to-peak PWM coupling; 24 mA drive ensures fast turn-on of optocoupled gate drivers; GND/VCC decoupling minimizes ground bounce. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal non-inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS244DW | Non-inverting octal buffer with identical pinout and electrical specs, but single shared output-enable (G) instead of dual 1G/2G | Lacks independent channel control - unsuitable for applications requiring asynchronous enable of two data paths | Select SN74LS244DW only when simplified control logic suffices and dual enable is unnecessary |
| SN74ALS241N | Advanced LS variant in PDIP package; lower ICC (17–27 mA vs. 27–46 mA), faster tPD (10 ns typ), but higher cost and obsolete packaging | Higher speed and lower power, but incompatible SOIC footprint and no RoHS-compliant DW option | Choose SN74ALS241N only for legacy through-hole designs where power savings outweigh rework costs |
Compared with SN74LS244DW and SN74ALS241N, the SN74LS241DW uniquely balances dual-channel independence, SOIC manufacturability, and proven reliability in field-deployed industrial systems - making it optimal for new designs requiring flexible bus segmentation and long-term component availability.
Availability
SN74LS241DW is available at Aetrix Electronics and suitable for memory address buffering, LED display driving, network backplane interfacing, and motor driver enable logic requiring stable component supply across extended product lifecycles.
Supply support for SN74LS241DW 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 50 years of innovation in industrial and automotive electronics.
The SN74LS241DW belongs to TI's legacy 74LS logic family, engineered for high-noise-margin, high-drive bus interfacing in mission-critical industrial control and telecommunications infrastructure.
FAQ
What is the function of pins 1 and 19 on the SN74LS241DW?
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 (1A1–1A4 → 1Y1–1Y4 or 2A1–2A4 → 2Y1–2Y4). When high, both channels enter high-impedance state. For safe power-up, TI recommends tying both to VCC via pullup resistors - SN74LS241DW requires this to prevent bus contention during initialization.
Can the SN74LS241DW interface directly with 3.3-V microcontrollers?
Yes, the SN74LS241DW accepts input high-level voltage as low as 2 V (VIH min), making it compatible with standard 3.3-V CMOS outputs without external level shifters. This capability is explicitly validated in TI's SDLS144D datasheet under Recommended Operating Conditions and enables mixed-voltage system design - a key feature of the SN74LS241DW in modernized legacy platforms.
What is the maximum trace length the SN74LS241DW can reliably drive?
The SN74LS241DW is characterized to drive terminated lines down to 133 Ω, which corresponds to approximately 15–20 cm of typical FR-4 microstrip at 5 V. Its 24 mA output drive and 18 ns max propagation delay support reliable signal integrity on PCB traces up to 100 mm in industrial control applications - confirmed by TI's application examples in SDLS144D Figure 24 and 25 for memory bus and party-line bus topologies.
How does the hysteresis in the SN74LS241DW improve system reliability?
The SN74LS241DW incorporates 0.4 V typical input hysteresis (VT+ − VT−), increasing noise immunity on slow-rising or electrically noisy signals. This design feature prevents false triggering caused by ground bounce, crosstalk, or EMI - especially critical in motor drive or relay-controlled environments. TI specifies this parameter in Electrical Characteristics section 6.5 and confirms its value across temperature in SDLS144D.
Is the SN74LS241DW pin-compatible with other members of the SN74LS24x family?
Yes, the SN74LS241DW shares identical SOIC (DW) package pinout with SN74LS240DW and SN74LS244DW, including pin-for-pin mapping of VCC (20), GND (10), and all I/O terminals. However, functional differences exist: SN74LS240DW is inverting, SN74LS244DW uses a single shared G input, while SN74LS241DW provides dual independent enables - all documented in TI's SDLS144D Pin Configuration and Functions table.
SN74LS241DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- 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:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74LS241DW FAQ
1.How can I place an order for SN74LS241DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS241DW 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 SN74LS241DW reliable?
The price and inventory of SN74LS241DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS241DW is usually 5 days.
3.What payment methods are accepted for SN74LS241DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS241DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS241DW?
SN74LS241DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS241DW 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 SN74LS241DW?
For technical support, including SN74LS241DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS241DW requirements.
6.How does Aetrix verify that SN74LS241DW is sourced from the original manufacturer or authorized distributors?
All SN74LS241DW 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 SN74LS241DW meets industry standards.
7.What is the process for return or replacement of SN74LS241DW?
All SN74LS241DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS241DW, 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 SN74LS241DW part is unused and in its original packaging.
Return procedure for SN74LS241DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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