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Texas Instruments SN74HCT541DW
- Part No.:
- SN74HCT541DW
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HCT541DW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,659
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Product details
Overview
SN74HCT541DW from Texas Instruments is an octal buffer and line driver IC with 3-state outputs, designed for bus interface and signal isolation in 5-V digital systems. It operates from 4.5 V to 5.5 V, delivers ±6-mA output drive at 5 V, exhibits typical propagation delay of 12 ns, and supports up to 15 LSTTL loads - enabling direct connection to system buses in industrial control and data acquisition modules.
For engineers reviewing the SN74HCT541DW datasheet, SN74HCT541DW pinout, SN74HCT541DW application, or SN74HCT541DW equivalent, key selection criteria include its true-output logic configuration, dual 3-state enable (OE1/OE2) control, TTL-compatible inputs, and SOIC-20 package with input/output separation for optimized PCB routing.
Technical Context
The SN74HCT541DW implements eight independent non-inverting buffers, each with high-current 3-state outputs controlled by a dual-input NOR gate (OE1 and OE2). When either enable input is high, all outputs enter high-impedance state - supporting bidirectional bus sharing and dynamic load management.
Its HCT logic family ensures TTL-voltage compatibility (VIH = 2 V, VIL = 0.8 V) while maintaining CMOS power efficiency (ICC ≤ 80 µA), and its data flow-through pinout places all eight inputs on one side and all eight outputs on the opposite side of the SOIC-20 package - reducing trace crossovers and improving signal integrity in dense layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - compatible with standard 5-V logic rails and tolerant of supply ripple common in industrial power domains. |
| Output drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads without external buffering, simplifying board-level fanout design. |
| Propagation delay | 12 ns typical (VCC = 5.5 V, CL = 50 pF) - enables reliable operation in sub-25-MHz synchronous bus interfaces. |
| Input compatibility | TTL-voltage level (VIH = 2 V, VIL = 0.8 V) - interoperable with legacy 74LS/74ALS devices without level-shifting circuitry. |
| Quiescent current | 80 µA max - minimizes standby power in battery-backed or energy-sensitive embedded systems. |
| 3-state enable logic | NOR-gated dual OE (OE1, OE2) - allows flexible bus arbitration: either enable asserted disables all outputs, supporting fail-safe bus release. |
Pinout & Package
SN74HCT541DW is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm with 1.27-mm lead pitch and 2.65-mm maximum height. The package features gull-wing leads, surface-mount compatibility, and JEDEC MS-013 registration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Inputs A1–A8 | True logic inputs driving corresponding buffer outputs; placed on left side of SOIC for flow-through layout. |
| 9, 19 | Output enables OE1, OE2 | NOR-gated control: either high forces all Y outputs into high-Z - critical for bus contention avoidance. |
| 10, 11, 12, 13, 14, 15, 16, 18 | Outputs Y1–Y8 | Non-inverting buffered outputs with ±6-mA drive; positioned on right side opposite inputs to minimize layer crossings. |
| 17 | VCC | Positive supply terminal (4.5–5.5 V); requires local 0.1-µF bypass capacitor per TI layout guidelines. |
| 20 | GND | Ground reference; must be low-impedance return path for all output switching currents. |
Key Features
| Feature | Design Value |
|---|---|
| Data flow-through pinout | Inputs (A1–A8) on left, outputs (Y1–Y8) on right - eliminates internal trace crossovers and reduces parasitic coupling in high-density PCBs. |
| Dual 3-state enable (OE1/OE2) | NOR logic allows either enable to independently disable all outputs - supports redundant control or OR-ed bus arbitration signals. |
| TTL-compatible inputs | VIH = 2 V, VIL = 0.8 V - ensures seamless integration with legacy 74LS, 74ALS, and microcontroller GPIOs without level shifters. |
| Low ICC (≤80 µA) | Reduces system-level quiescent power - advantageous in always-on industrial monitoring nodes where thermal budget is constrained. |
| High-noise-immunity outputs | VOH ≥ 3.7 V / VOL ≤ 0.33 V at 6-mA load - maintains >1.5-V noise margin under full drive, improving robustness in electrically noisy factory environments. |
Applications
| Industrial Bus Interface | Microcontroller I/O Expansion |
|---|---|
|
Use Scenario: Isolating and driving address/data lines between a PLC CPU and modular I/O backplane. IC Role / Device Role / Timing Role: Octal buffer providing direction-controlled signal conditioning and bus contention protection via 3-state outputs. Use Value: Enables hot-swappable module insertion without disrupting active bus communication due to fast, predictable enable/disable timing (ten/tdis ≤ 34 ns). |
Use Scenario: Extending GPIO count of an ARM Cortex-M4 MCU to drive 16-channel relay bank in HVAC controller. IC Role / Device Role / Timing Role: Level-translating and current-boosting buffer between MCU pins and relay coil drivers. Use Value: Eliminates need for discrete transistors or dedicated level shifters thanks to TTL-compatible inputs and ±6-mA drive capability. |
| Test Equipment Signal Routing | Digital Logic Prototyping |
|
Use Scenario: Multiplexing test signals across multiple DUT channels in automated functional test fixture. IC Role / Device Role / Timing Role: Bidirectional bus driver with precise 3-state control for channel selection and signal isolation. Use Value: Prevents signal leakage between test channels using guaranteed high-Z state (IOZ ≤ 5 µA) during disable. |
Use Scenario: Interfacing FPGA development board with breadboard-based peripheral circuits requiring 5-V logic levels. IC Role / Device Role / Timing Role: Voltage- and drive-capability translator between 3.3-V FPGA I/O and 5-V discrete logic chips. Use Value: Supports mixed-voltage prototyping without external pull-ups or resistive dividers, leveraging native TTL input thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT240N | Octal inverting buffer with identical SOIC-20 package, same VCC range and drive strength, but inverted output logic. | Requires logic inversion in upstream/downstream stages; unsuitable where signal polarity must be preserved. | Select SN74HCT240N only when system architecture benefits from active-low data paths or complements existing inverting logic. |
| 74ACT541PC | Higher-speed ACT-family variant (tpd ≈ 8 ns), 4.5–5.5 V supply, but higher ICC (max 4 mA) and less common availability. | Better suited for high-frequency bus applications (>30 MHz), but increases static power and thermal load. | Choose 74ACT541PC only if propagation delay reduction is critical and additional power dissipation can be managed thermally. |
Compared with SN74HCT240N and 74ACT541PC, the SN74HCT541DW offers true-output logic, lowest quiescent current among equivalents, and broad distribution - making it optimal for cost-sensitive, power-constrained, and polarity-critical industrial interfaces.
Availability
SN74HCT541DW is available at Aetrix Electronics and suitable for industrial bus interface, microcontroller I/O expansion, test equipment signal routing, and digital logic prototyping requiring stable component supply and long-term sourcing continuity.
Supply support for SN74HCT541DW 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74HCT541DW belongs to TI's 74HCT logic family, engineered for TTL-compatible operation in 5-V systems where low power, noise immunity, and bus interfacing reliability are prioritized over maximum speed.
FAQ
What is the operating voltage range for the SN74HCT541DW?
The SN74HCT541DW operates from 4.5 V to 5.5 V. This range ensures compatibility with standard 5-V power rails while accommodating typical supply tolerances and ripple found in industrial power supplies. Operation outside this range may cause undefined behavior or damage, as specified in the absolute maximum ratings table of the official datasheet.
Does the SN74HCT541DW support true or inverted output logic?
The SN74HCT541DW provides true (non-inverting) output logic: each Yn output replicates the logic state of its corresponding An input when enabled. This distinguishes it from inverting variants like the SN74HCT240, and makes the SN74HCT541DW appropriate for applications requiring signal polarity preservation, such as address/data bus buffering.
How many LSTTL loads can the SN74HCT541DW drive per output?
Each output of the SN74HCT541DW can drive up to 15 LSTTL loads, based on its ±6-mA output current capability at 5 V. This specification is confirmed in the device features and electrical characteristics sections of the TI datasheet, and eliminates the need for additional buffer stages in typical 5-V logic interfacing scenarios.
What is the function of the two output-enable pins (OE1 and OE2) on the SN74HCT541DW?
The SN74HCT541DW uses a dual NOR-gated enable structure: if either OE1 or OE2 is high, all eight outputs enter high-impedance state. This design allows flexible bus control - for example, OE1 may serve as primary enable while OE2 acts as fault-safety override - ensuring deterministic bus release without requiring coordinated timing between both signals.
Is the SN74HCT541DW pin-compatible with other packages in the same family?
No - the SN74HCT541DW (SOIC-20) shares identical pinout and functionality with other 20-pin variants like SN74HCT541DB (SSOP) and SN74HCT541N (PDIP), but mechanical dimensions, thermal performance, and soldering requirements differ. The pin assignment is consistent across all 20-pin versions, enabling drop-in replacement at the schematic level when package constraints allow.
SN74HCT541DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HCT541DW FAQ
1.How can I place an order for SN74HCT541DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT541DW 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 SN74HCT541DW reliable?
The price and inventory of SN74HCT541DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT541DW is usually 5 days.
3.What payment methods are accepted for SN74HCT541DW?
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4.How is shipping managed for SN74HCT541DW?
SN74HCT541DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT541DW 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 SN74HCT541DW?
For technical support, including SN74HCT541DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT541DW requirements.
6.How does Aetrix verify that SN74HCT541DW is sourced from the original manufacturer or authorized distributors?
All SN74HCT541DW 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 SN74HCT541DW meets industry standards.
7.What is the process for return or replacement of SN74HCT541DW?
All SN74HCT541DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT541DW, 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 SN74HCT541DW part is unused and in its original packaging.
Return procedure for SN74HCT541DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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