My Inquiry
My Account
Texas Instruments SN74LS541DWRG4
- Part No.:
- SN74LS541DWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LS541DWRG4.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,746
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LS541DWRG4 from Texas Instruments is an octal buffer/line driver with 3-state outputs, designed for bidirectional data bus interfacing in TTL-based digital systems. It features high-impedance outputs when disabled (OE = HIGH), 26 mA sink / 0.4 mA source output drive capability, and operates over 0°C to 70°C ambient temperature. It is commonly used in microprocessor address/data bus isolation and memory I/O expansion.
For engineers reviewing the SN74LS541DWRG4 datasheet, SN74LS541DWRG4 pinout, SN74LS541DWRG4 application, or SN74LS541DWRG4 equivalent, key selection criteria include its 3-state control logic (active-low OE), TTL-compatible input thresholds, SOIC-20 package footprint, and compatibility with legacy LS-TTL bus loading requirements.
Technical Context
The SN74LS541DWRG4 implements eight independent non-inverting buffers, each with a dedicated 3-state output enable (OE) controlled by a single active-low input. Its internal circuitry uses bipolar TTL technology with Schottky-clamped transistors to achieve propagation delays of 15 ns (typical) at VCC = 5 V and CL = 15 pF.
Input thresholds are specified at VIH = 2.0 V (min) and VIL = 0.8 V (max), ensuring reliable interfacing with standard TTL logic families. Output voltage levels meet VOH = 2.7 V (min) at IOH = –0.4 mA and VOL = 0.5 V (max) at IOL = 26 mA, supporting direct connection to LS-TTL and standard TTL loads without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures compatibility with legacy 74LS series timing and voltage thresholds |
| Function | Octal non-inverting 3-state buffer - enables bidirectional bus control via single OE pin |
| Output Drive | 26 mA sink / 0.4 mA source - sufficient to drive 20 LS-TTL loads per output |
| Propagation Delay | 15 ns (typ) at VCC = 5 V, CL = 15 pF - defines maximum clock rate in synchronous bus applications |
| Operating Temperature | 0°C to 70°C - suitable for commercial-grade embedded control and instrumentation systems |
| Supply Voltage | 4.75 V to 5.25 V - tight tolerance supports stable operation under noisy power rails |
| Input Thresholds | VIL = 0.8 V (max), VIH = 2.0 V (min) - guarantees noise margin > 0.4 V in mixed-logic environments |
Pinout & Package
SN74LS541DWRG4 is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.8 mm long, with 1.27 mm pitch and 2.65 mm max height. Pin 1 is located at the top-left corner adjacent to the index notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Inputs (A1–A8) | Active-high TTL-compatible data inputs driving corresponding outputs Y1–Y8 |
| 9 | GND | Ground reference for all internal logic and output stages |
| 10, 11, 12, 13, 14, 15, 16, 17 | Outputs (Y1–Y8) | Non-inverting buffered outputs with 3-state capability; high-impedance when OE = HIGH |
| 18 | OE | Active-low output enable - disables all Y outputs to high-impedance state when HIGH |
| 19 | VCC | +5 V supply for internal logic and output drivers |
| 20 | NC | No connect - internally unused; must remain unconnected per TI specification |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Outputs | Single active-low OE pin controls all eight outputs simultaneously, enabling clean bus sharing without contention |
| TTL-Compatible Interface | Meets standard LS-TTL input/output voltage and current specifications, eliminating level-shifting in legacy designs |
| High Fan-Out Capability | Each output drives up to 20 LS-TTL loads, reducing need for additional buffering in dense bus architectures |
| Low Propagation Delay | 15 ns typical delay supports system clock rates up to ~30 MHz in short-bus configurations |
| SOIC-20 RoHS-Compliant Package | NIPDAU lead finish, MSL Level-1 rating, and 2000-unit tape-and-reel packaging support automated SMT assembly |
Applications
| Microprocessor Bus Isolation | Memory Address Latching |
|---|---|
|
Use Scenario: Isolating CPU address/data lines from peripheral devices during DMA or interrupt cycles. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer enabling time-multiplexed bus access without signal contention. Use Value: Prevents bus conflicts and reduces signal integrity issues in multi-master 8-bit systems like Z80 or 8085 platforms. |
Use Scenario: Latching 16-bit memory addresses between multiplexed AD0–AD15 bus and static RAM chips. IC Role / Device Role / Timing Role: Non-inverting buffer with controlled output enable synchronizing address setup before memory access. Use Value: Ensures valid address hold time and eliminates timing skew across parallel address lines in legacy memory subsystems. |
| I/O Port Expansion | Legacy Industrial Control Interface |
|
Use Scenario: Expanding GPIO count on microcontrollers with limited native I/O pins using parallel port peripherals. IC Role / Device Role / Timing Role: Octal buffer providing additional drive strength and logic-level translation for external sensors/actuators. Use Value: Enables direct connection of TTL-level switches, LEDs, and relays without discrete transistor drivers. |
Use Scenario: Interfacing programmable logic controllers (PLCs) with field-mounted binary sensors and indicators. IC Role / Device Role / Timing Role: Robust bus driver meeting industrial noise immunity requirements in 5 V DC control cabinets. Use Value: Maintains signal integrity over longer PCB traces and withstands EMI common in factory-floor environments. |
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 |
|---|---|---|---|
| SN74LS241N | Two groups of four 3-state buffers with separate OE controls; different pinout and enable logic | Supports independent control of two 4-bit buses instead of one unified 8-bit bus | Select when dual independent bus segments require isolated enable control |
| SN74LS244N | Octal non-inverting buffer with active-high OE (vs. active-low OE on SN74LS541DWRG4) | Requires inverted OE signal routing; identical drive strength and timing | Choose when system OE logic is active-high or when consolidating with existing LS244-based designs |
Compared with SN74LS241N and SN74LS244N, the SN74LS541DWRG4 provides unified active-low 3-state control ideal for simple bus arbitration, while SN74LS241N offers granular group control and SN74LS244N aligns with active-high system enable architecture.
Availability
SN74LS541DWRG4 is available at Aetrix Electronics and suitable for microprocessor bus isolation, memory address latching, I/O port expansion, and legacy industrial control interface applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74LS541DWRG4 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 with broad industrial, automotive, and communications reach.
The SN74LS541DWRG4 belongs to TI's legacy 74LS logic family, engineered for reliability and interoperability in retro-compatible digital systems where deterministic timing and proven bus-loading behavior are critical.
FAQ
What is the function of the OE pin on the SN74LS541DWRG4?
The OE (Output Enable) pin on the SN74LS541DWRG4 is an active-low control input that places all eight outputs into a high-impedance state when driven HIGH. When OE is LOW, the device functions as an octal non-inverting buffer, passing inputs A1–A8 to outputs Y1–Y8. This behavior allows the SN74LS541DWRG4 to share a common data bus with other devices without signal contention.
Does the SN74LS541DWRG4 support 5 V-only operation?
Yes, the SN74LS541DWRG4 is specified for 4.75 V to 5.25 V operation only. It is not designed for 3.3 V or mixed-voltage operation. Its input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and output levels (VOH ≥ 2.7 V, VOL ≤ 0.5 V) are optimized for 5 V TTL systems. Using the SN74LS541DWRG4 outside this range may result in undefined logic states or degraded noise margin.
Is the SN74LS541DWRG4 pin-compatible with other 74LS-series octal buffers?
The SN74LS541DWRG4 shares the same 20-pin SOIC (DW) footprint and functional pinout as SN74LS244N and SN74LS241N, but OE polarity differs: SN74LS541DWRG4 uses active-low OE, while SN74LS244N uses active-high OE. Direct substitution requires OE signal inversion. SN74LS541DWRG4 is not pin-compatible with SN74LS540 (inverting version), which has opposite logic polarity on all outputs.
What is the maximum capacitive load the SN74LS541DWRG4 can drive reliably?
The SN74LS541DWRG4 is characterized for CL = 15 pF in timing specifications, with propagation delay measured under that condition. While it can physically drive higher capacitance, signal integrity degrades beyond ~50 pF due to increased rise/fall times and potential ringing. For loads exceeding 15 pF, layout optimization (short traces, proper termination) or local buffering is recommended to maintain timing margins in the SN74LS541DWRG4 application.
Can the SN74LS541DWRG4 be used in new designs today?
Yes - the SN74LS541DWRG4 remains in active production by Texas Instruments with SOIC-20 tape-and-reel packaging (2000 units per reel) and RoHS-compliant NIPDAU finish. Its continued availability, documented 0°C to 70°C operation, and proven reliability make it suitable for new industrial, test equipment, and legacy-system replacement designs where LS-TTL compatibility is required.
SN74LS541DWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- 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
SN74LS541DWRG4 FAQ
1.How can I place an order for SN74LS541DWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS541DWRG4 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 SN74LS541DWRG4 reliable?
The price and inventory of SN74LS541DWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS541DWRG4 is usually 5 days.
3.What payment methods are accepted for SN74LS541DWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS541DWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS541DWRG4?
SN74LS541DWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS541DWRG4 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 SN74LS541DWRG4?
For technical support, including SN74LS541DWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS541DWRG4 requirements.
6.How does Aetrix verify that SN74LS541DWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LS541DWRG4 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 SN74LS541DWRG4 meets industry standards.
7.What is the process for return or replacement of SN74LS541DWRG4?
All SN74LS541DWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS541DWRG4, 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 SN74LS541DWRG4 part is unused and in its original packaging.
Return procedure for SN74LS541DWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LS541DWRG4 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…
