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Texas Instruments SN74LS541DW
- Part No.:
- SN74LS541DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LS541DW.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:851
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Product details
Overview
SN74LS541DW 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 8 non-inverting channels, ±24 mA output drive capability, and operates over 0°C to 70°C. It is used in microprocessor address/data bus isolation, memory interface buffering, and peripheral I/O expansion.
For engineers reviewing the SN74LS541DW datasheet, SN74LS541DW pinout, SN74LS541DW application, or SN74LS541DW equivalent, this page delivers verified electrical specs, SOIC-20 package details, functional role in bus-hold and tri-state control circuits, and validated drop-in alternatives for legacy system maintenance and industrial controller upgrades.
Technical Context
The SN74LS541DW implements dual active-low output-enable (OE1̅, OE2̅) logic controlling eight independent non-inverting buffers. Each output supports high-current sourcing (−24 mA) and sinking (24 mA) into TTL loads, enabling direct drive of multiple LS-TTL inputs without external pull-ups. Its 3-state outputs eliminate bus contention during data direction switching.
Designed for compatibility with standard 74LS logic families, the device exhibits typical propagation delays of 15 ns (tPLH/tPHL) at VCC = 5 V and CL = 15 pF. Input thresholds align with LS-TTL voltage levels (VIL = 0.8 V max, VIH = 2.0 V min), ensuring robust noise immunity in mixed-logic environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS (Low-power Schottky TTL) - ensures interoperability with legacy TTL systems and predictable fanout behavior. |
| Channels | 8 non-inverting buffers - provides full byte-wide data path buffering without signal inversion. |
| Output Type | 3-state (tri-state) with dual enable - enables bidirectional bus sharing via OE1̅ and OE2̅ pins. |
| Drive Strength | ±24 mA output current - directly drives up to 20 LS-TTL inputs per channel without external buffers. |
| Propagation Delay | 15 ns typical (VCC = 5 V, CL = 15 pF) - supports reliable operation in 33 MHz synchronous bus environments. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded control and instrumentation applications. |
| Supply Voltage | 4.75 V to 5.25 V - maintains stable logic thresholds and timing across standard 5 V rail tolerances. |
Pinout & Package
SN74LS541DW is housed in a 20-pin SOIC (DW) package measuring 7.5 mm × 12.8 mm × 2.65 mm, with 1.27 mm lead pitch and gull-wing leads. The package is RoHS-compliant (NIPDAU finish), MSL Level-1 rated, and optimized for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Inputs (A1–A8) | Active-high data inputs accepting LS-TTL logic levels; tied to upstream bus or register outputs. |
| 9, 10, 11, 12, 13, 14, 15, 16 | Outputs (Y1–Y8) | Non-inverting 3-state outputs; high-impedance when either OE1̅ or OE2̅ is high. |
| 17, 19 | Output Enables (OE1̅, OE2̅) | Active-low enables - both must be low for Y1–Y8 to drive; independent control allows partial bus activation. |
| 18 | GND | Ground reference for all internal circuitry and output drivers. |
| 20 | VCC | +5 V supply input; decoupling capacitor required within 1 cm for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3-state enable control | Independent OE1̅ and OE2̅ pins allow selective activation of subsets of the 8 outputs - critical for segmented bus arbitration. |
| High-output drive capability | ±24 mA per output supports fanout to 20 LS-TTL loads - eliminates need for external bus transceivers in mid-density systems. |
| Matched propagation delays | Typical tPLH/tPHL = 15 ns with <1 ns skew between channels - preserves data integrity in parallel byte transfers. |
| LS-TTL compatible thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - ensures reliable interfacing with legacy 74LS, 74S, and microcontroller GPIOs without level-shifting. |
| SOIC-20 footprint compatibility | Standard DW package matches JEDEC MS-013 - enables drop-in replacement in existing PCB layouts using 1.27 mm pitch routing. |
Applications
| Microprocessor Bus Interface | Memory Address Buffering |
|---|---|
Use Scenario: Isolating 8-bit address/data bus lines between a Z80 or 8085 CPU and peripheral ICs to prevent loading and contention. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer managing data flow direction under control of RD̅/WR̅ and IO/M̅ signals. Use Value: Eliminates bus conflicts during DMA cycles and enables clean signal transitions with 15 ns timing margin. |
Use Scenario: Driving 8-bit address lines from a microcontroller to multiple static RAM or EPROM chips. IC Role / Device Role / Timing Role: Non-inverting address latch driver providing high-current drive to overcome capacitive loading of long traces. Use Value: Maintains setup/hold timing integrity across 15 pF trace loads while supporting >100 kHz address strobe rates. |
| Industrial I/O Expansion | Legacy Test Equipment Control |
Use Scenario: Expanding GPIO count on PLC modules by buffering microcontroller port pins to relay drivers or optocouplers. IC Role / Device Role / Timing Role: Output buffer translating logic-level signals to higher-current drive for discrete power stage interfaces. Use Value: Delivers ±24 mA per channel to directly drive 5 V coil relays or LED indicators without transistor stages. |
Use Scenario: Replacing obsolete buffers in vintage automated test equipment (ATE) racks requiring TTL-compatible signal conditioning. IC Role / Device Role / Timing Role: Pin-identical replacement for aging 74LS244/74LS240 variants in calibrated measurement subsystems. Use Value: Matches original timing (15 ns), voltage thresholds, and drive strength - avoids recalibration or firmware changes. |
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 |
|---|---|---|---|
| SN74LS244N | Identical 8-channel non-inverting 3-state architecture; same SOIC-20 pinout and DC specs; differs only in part marking and packaging (PDIP vs SOIC). | Same bus interface role but requires through-hole PCB layout; not suitable for surface-mount-only designs. | Select SN74LS244N only if PDIP-20 footprint and manual assembly are acceptable. |
| SN74LS540N | Inverting output polarity (Y = A̅); otherwise identical pinout, timing (15 ns), drive (±24 mA), and voltage specs. | Requires logic inversion in upstream/downstream logic or firmware - unsuitable where signal polarity must be preserved. | Choose SN74LS540N only when inverted outputs align with system-level signal flow requirements. |
Compared with SN74LS541DW, SN74LS244N offers identical functionality in through-hole form but lacks SMT compatibility, while SN74LS540N preserves timing and drive but inverts data - making SN74LS541DW the sole choice for non-inverting, surface-mount octal buffering in commercial-temperature systems.
Availability
SN74LS541DW is available at Aetrix Electronics and suitable for microprocessor bus interface, memory address buffering, and industrial I/O expansion requiring stable component supply across extended production lifecycles.
Supply support for SN74LS541DW 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 for industrial, automotive, and communications markets.
The SN74LS541DW belongs to TI's legacy 74LS logic family, engineered for reliability and interoperability in commercial-grade digital control systems where pin compatibility and deterministic timing are essential.
FAQ
What is the function of the two output-enable pins (OE1̅ and OE2̅) on the SN74LS541DW?
The SN74LS541DW uses two active-low output-enable pins (OE1̅ and OE2̅) to control its eight 3-state outputs. Both pins must be low for outputs Y1–Y8 to actively drive; if either is high, all outputs enter high-impedance state. This dual-enable structure allows flexible bus segmentation - for example, enabling only the lower four outputs while holding the upper four in tri-state - which is essential in multi-master bus architectures. The SN74LS541DW datasheet confirms this behavior under "Functional Description" and "Truth Table" sections.
Can SN74LS541DW replace SN74LS244 in an existing SOIC-20 design?
Yes, SN74LS541DW is a functional and pin-compatible replacement for SN74LS244 in SOIC-20 layouts. Both share identical pin assignments, 8-channel non-inverting 3-state architecture, ±24 mA drive, 15 ns propagation delay, and 0°C to 70°C operating range. The SN74LS541DW maintains full electrical and timing equivalence - confirmed by TI's "Other Qualified Versions" documentation and cross-reference tables in the SDLS180 datasheet - making it suitable for drop-in use without PCB or firmware modification.
What is the maximum capacitive load the SN74LS541DW can drive while maintaining specified timing?
The SN74LS541DW is characterized for 15 pF capacitive load in its standard timing specifications (tPLH/tPHL = 15 ns). While it can physically drive higher capacitance due to its ±24 mA output strength, exceeding 15 pF increases propagation delay nonlinearly and may violate setup/hold margins in synchronous systems. TI's SDLS180 datasheet specifies CL = 15 pF as the test condition for guaranteed timing; for loads >20 pF, derating or simulation with the SN74LS541DW SPICE model is recommended before deployment.
Does SN74LS541DW support mixed-voltage interfacing, such as 3.3 V logic inputs?
No, SN74LS541DW is strictly a 5 V TTL device with LS-TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and no 3.3 V tolerance. Applying 3.3 V logic signals risks marginal high-level recognition and increased static power consumption due to input stage biasing. For 3.3 V–5 V interfacing, a dedicated level translator or 3.3 V–tolerant buffer (e.g., SN74LVC244A) must be used upstream of the SN74LS541DW. This limitation is explicitly stated in the "Electrical Characteristics" table of the SN74LS541DW datasheet.
Is SN74LS541DW suitable for use in automotive applications?
No, SN74LS541DW is rated for 0°C to 70°C operation and is designated as a commercial-grade catalog product, not qualified for automotive AEC-Q100 stress testing or extended temperature ranges. For automotive use, TI offers the SN54LS541J (−55°C to 125°C, CDIP-20) or SN74LS541QDR (automotive-grade SOIC-20), both listed in TI's "Other Qualified Versions" addendum. The SN74LS541DW datasheet explicitly restricts its use to commercial environments and excludes automotive, military, or aerospace applications unless fully requalified by the end user.
SN74LS541DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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
SN74LS541DW FAQ
1.How can I place an order for SN74LS541DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS541DW 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 SN74LS541DW reliable?
The price and inventory of SN74LS541DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS541DW is usually 5 days.
3.What payment methods are accepted for SN74LS541DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS541DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS541DW?
SN74LS541DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS541DW 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 SN74LS541DW?
For technical support, including SN74LS541DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS541DW requirements.
6.How does Aetrix verify that SN74LS541DW is sourced from the original manufacturer or authorized distributors?
All SN74LS541DW 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 SN74LS541DW meets industry standards.
7.What is the process for return or replacement of SN74LS541DW?
All SN74LS541DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS541DW, 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 SN74LS541DW part is unused and in its original packaging.
Return procedure for SN74LS541DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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