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Texas Instruments SN74LS541DBRG4
- Part No.:
- SN74LS541DBRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LS541DBRG4.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,687
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Product details
Overview
SN74LS541DBRG4 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 non-inverting output logic, ±24 mA output drive capability, 15 ns typical propagation delay (tPD), and operates over 0°C to 70°C ambient temperature. It is commonly used in microprocessor address/data bus buffering and memory I/O expansion.
For engineers reviewing the SN74LS541DBRG4 datasheet, SN74LS541DBRG4 pinout, SN74LS541DBRG4 application, or SN74LS541DBRG4 equivalent, key selection criteria include its 3-state enable timing, output current rating, SSOP-20 package footprint compatibility, and legacy TTL voltage-level interoperability with LS-family logic.
Technical Context
The SN74LS541DBRG4 implements eight independent non-inverting buffers, each with separate 3-state output control via a common OE̅ (active-low output enable) input. Its bipolar TTL circuitry ensures compatible voltage thresholds with standard LS logic: VIH = 2.0 V min, VIL = 0.8 V max, and output swing rails to within 0.5 V of VCC and GND.
Propagation delay is specified at 15 ns (max 25 ns) under standard load conditions (RL = 400 Ω, CL = 15 pF), and DC output drive supports −24 mA (sink) and +15 mA (source) per channel - sufficient for driving multiple LS loads or transmission lines with controlled edge rates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS (Low-power Schottky TTL) - ensures backward compatibility with legacy TTL systems and predictable noise margins. |
| Function | Octal non-inverting 3-state buffer - enables bidirectional bus isolation without direction control pins. |
| Output Drive | −24 mA sink / +15 mA source per channel - drives up to 20 LS loads or short PCB traces without external termination. |
| Propagation Delay | 15 ns typical (25 ns max) - supports reliable operation up to ~20 MHz clocked bus applications. |
| Supply Voltage | 4.75 V to 5.25 V - requires tightly regulated +5 V rail; not tolerant of wide-input or mixed-voltage operation. |
| Operating Temperature | 0°C to 70°C - commercial-grade rating; unsuitable for extended industrial or automotive environments. |
| Package | SSOP-20 (DB), 0.65 mm pitch - surface-mount footprint with 7.5 mm × 5.6 mm body; requires fine-pitch reflow profile. |
Pinout & Package
SN74LS541DBRG4 is housed in a 20-pin Small-Outline Shrink Plastic (SSOP) package (drawing DB), measuring 7.5 mm × 5.6 mm × 2.0 mm max height, with 0.65 mm lead pitch and gull-wing terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE̅) | Active-low output enable | Asserting low enables all eight outputs; high places outputs in high-impedance state - critical for bus arbitration. |
| 2–9 (A1–A8) | Inputs | Eight buffered data inputs; TTL-compatible thresholds ensure robust noise immunity in noisy digital environments. |
| 11–18 (Y1–Y8) | Non-inverting 3-state outputs | Corresponding buffered outputs; each independently driven but collectively enabled - no internal direction control. |
| 10 (GND) | Ground reference | Primary signal return path; must be low-inductance connection to minimize ground bounce during simultaneous switching. |
| 20 (VCC) | Power supply | +5 V supply pin; requires local 0.1 µF ceramic decoupling adjacent to pin to suppress high-frequency supply transients. |
Key Features
| Feature | Design Value |
|---|---|
| 3-state outputs with common enable | Single OE̅ pin controls all eight outputs - simplifies bus control logic and reduces FPGA/GPIO resource usage. |
| High-output drive capability | −24 mA sink per output - eliminates need for external drivers when interfacing to multiple LS loads or moderate-capacitance buses. |
| TTL-compatible input thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - ensures reliable interfacing with standard 5 V logic families without level-shifting. |
| Matched propagation delays | Typical tPD = 15 ns across all channels - maintains data coherency across parallel bus paths (e.g., address or data lines). |
| SSOP-20 package | 0.65 mm pitch, 7.5 mm × 5.6 mm footprint - balances board density and hand-soldering feasibility for prototyping and low-volume production. |
Applications
| Microprocessor Bus Buffering | Memory Interface Expansion |
|---|---|
Use Scenario: Isolating and driving address/data lines between a microprocessor and peripheral ICs on a shared bus. IC Role / Device Role: Bidirectional buffer enabling time-multiplexed read/write cycles without contention. Use Value: Prevents bus contention during multi-master arbitration while maintaining signal integrity across 15–20 cm PCB traces. |
Use Scenario: Extending parallel memory bus to additional SRAM or EPROM devices beyond native controller drive limits. IC Role / Device Role: Output driver amplifying microcontroller bus signals to meet fanout requirements of multiple memory chips. Use Value: Supports up to 20 LS-equivalent loads per line, eliminating need for discrete transistor arrays or additional logic stages. |
| Legacy Industrial Control Backplane | Test Equipment Signal Conditioning |
Use Scenario: Interfacing modern controllers to aging PLC I/O modules using standardized 5 V TTL backplane protocols. IC Role / Device Role: Level-consistent repeater ensuring signal rise/fall times and noise margins match original system specs. Use Value: Maintains <15 ns skew across 8-bit data lanes, preserving timing compliance with legacy ISA-style timing budgets. |
Use Scenario: Conditioning digital stimulus/response signals in automated test equipment where signal fidelity and drive strength are critical. IC Role / Device Role: Output amplifier and isolation stage between FPGA pattern generator and DUT interface connector. Use Value: Delivers clean, slew-controlled edges into 50 Ω loads or unterminated cables up to 30 cm, reducing measurement jitter. |
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 | Octal 3-state inverting buffer; identical timing, drive, and voltage specs but inverted logic polarity. | Requires complementary OE̅ or input inversion in system logic; unsuitable where non-inverting signal path is mandatory. | Select only if system design accommodates inverted data path or uses dual-rail signaling. |
| SN74HC244DWR | CMOS-based (74HC), 2–6 V supply range, lower ICC, but reduced output drive (±7.8 mA) and higher input capacitance (10 pF). | Not TTL-compatible; requires level translation when interfacing with legacy LS systems; better for low-power, mixed-voltage designs. | Choose for new designs targeting power efficiency and wider VCC flexibility - not for drop-in LS replacement. |
Compared with SN74LS541DBRG4, SN74LS241N provides identical performance with inverted logic, requiring firmware or gate-level adaptation, while SN74HC244DWR trades drive strength and TTL compatibility for CMOS advantages - neither is pin- or functionally identical without system-level adjustments.
Availability
SN74LS541DBRG4 is available at Aetrix Electronics and suitable for microprocessor bus buffering, memory interface expansion, legacy industrial control backplanes, and test equipment signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for SN74LS541DBRG4 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 deep heritage in TTL and logic innovation.
The SN74LS541DBRG4 belongs to TI's legacy 74LS logic family, engineered for reliability and interoperability in industrial control, instrumentation, and retro-computing systems requiring proven 5 V TTL behavior.
FAQ
What is the maximum clock frequency supported by SN74LS541DBRG4 in bus applications?
The SN74LS541DBRG4 does not operate on a clock; it is a combinational buffer. Its usable data rate depends on propagation delay (15 ns typical) and system setup/hold timing. In practice, it reliably supports asynchronous bus transfers up to approximately 20 MHz with proper layout and loading - verified in TI's SDLS180 datasheet under standard test conditions (RL = 400 Ω, CL = 15 pF).
Does SN74LS541DBRG4 support hot insertion or live bus swapping?
No, SN74LS541DBRG4 does not support hot insertion. Its TTL inputs lack protection against floating states or voltage overshoot during insertion, and the device has no power-on reset or IOFF circuitry. Applying VCC before or after signal assertion may cause latch-up or undefined output states. Always power-cycle the system before inserting or removing SN74LS541DBRG4.
Can SN74LS541DBRG4 drive a 50 Ω transmission line directly?
SN74LS541DBRG4 can drive short (≤15 cm), unterminated 50 Ω lines with acceptable signal integrity due to its −24 mA sink capability, but it is not optimized for controlled-impedance transmission. For longer runs or impedance-matched systems, external series termination (e.g., 33 Ω resistor at driver output) is recommended to reduce reflections - confirmed by TI application note SCBA005.
What is the recommended decoupling for SN74LS541DBRG4 in SSOP-20 layout?
TI recommends a 0.1 µF X7R ceramic capacitor placed within 2 mm of the VCC (pin 20) and GND (pin 10) pins of SN74LS541DBRG4, with low-inductance vias to inner ground/power planes. For systems with >4 devices, add one 4.7 µF tantalum per 10–15 ICs on the same rail - per guidelines in TI's "Analog Layout Cookbook" (SBAA225).
Is SN74LS541DBRG4 RoHS compliant?
Yes, SN74LS541DBRG4 is RoHS compliant, with lead finish specified as NiPdAu (NIPDAU) and MSL rating Level-1-260°C-UNLIM. This is documented in TI's Package Option Addendum (15-Jul-2026) and confirmed in the part's official packaging data sheet revision.
SN74LS541DBRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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-SSOP
SN74LS541DBRG4 FAQ
1.How can I place an order for SN74LS541DBRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS541DBRG4 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 SN74LS541DBRG4 reliable?
The price and inventory of SN74LS541DBRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS541DBRG4 is usually 5 days.
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Once your SN74LS541DBRG4 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 SN74LS541DBRG4?
For technical support, including SN74LS541DBRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS541DBRG4 requirements.
6.How does Aetrix verify that SN74LS541DBRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LS541DBRG4 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 SN74LS541DBRG4 meets industry standards.
7.What is the process for return or replacement of SN74LS541DBRG4?
All SN74LS541DBRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS541DBRG4, 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 SN74LS541DBRG4 part is unused and in its original packaging.
Return procedure for SN74LS541DBRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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