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Texas Instruments SN74HCT541NS
- Part No.:
- SN74HCT541NS
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74HCT541NS.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,328
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Product details
Overview
SN74HCT541NS from Texas Instruments is an octal buffer and line driver with 3-state outputs, designed for bus interface and data routing in 5-V TTL-compatible 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 instrumentation applications.
For engineers reviewing the SN74HCT541NS datasheet, SN74HCT541NS pinout, SN74HCT541NS application, or SN74HCT541NS equivalent, key selection criteria include its true-output logic configuration, dual 3-state enable (OE1/OE2) control, data-flow-through SO-20 package layout, and compatibility with legacy 'HC240-series board designs requiring high-current 3-state buffering.
Technical Context
The SN74HCT541NS implements eight independent non-inverting buffers, each with a 2-input NOR-based 3-state control gate (OE1 and OE2). When either OE input is high, all eight Y outputs enter high-impedance state - enabling bidirectional bus sharing without external logic.
Its TTL-compatible inputs accept 0.8 V (VIL) and 2.0 V (VIH) thresholds across 4.5–5.5 V supply, while output VOH/VOL specs guarantee 3.7 V min and 0.4 V max under 6-mA load - ensuring robust noise margin and interoperability with standard LS-TTL and CMOS loads.
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 nominal ±5% regulation variation. |
| Output Drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads or terminate short PCB traces without external buffers. |
| Propagation Delay | 12 ns typical (5.5 V, CL = 50 pF) - enables reliable operation in 33-MHz bus cycles with timing margin. |
| Input Compatibility | TTL-voltage compatible - accepts standard 0.8 V/2.0 V input thresholds, eliminating level-shifter requirements in mixed-logic systems. |
| Quiescent Current | 80 µA max - supports low-static-power system design where standby current impacts thermal or battery life budgets. |
| 3-State Enable Logic | NOR-gated OE1/OE2 - active-low enable behavior allows wired-OR bus control or hierarchical enable tree implementation. |
Pinout & Package
SOP-20 (SO-20) package, 15.00 mm × 5.30 mm body size, with gull-wing leads and pin 1 index area marked on top surface. Pinout follows data-flow-through arrangement: all eight A inputs (A1–A8) on one side, all eight Y outputs (Y1–Y8) on opposite side, with dual OE controls and power pins centrally located for optimal decoupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | True-buffer input terminals accepting TTL-compatible logic levels; routed to corresponding Y outputs when enabled. |
| 9, 19 | OE1, OE2 | Active-low 3-state enable controls - either high forces all Y outputs into high-Z; both low enables data pass-through. |
| 10, 11, 12, 13, 14, 15, 16, 18 | Y1–Y8 Outputs | Non-inverting buffered outputs with ±6-mA drive capability and 3-state support; placed opposite A-side for simplified PCB routing. |
| 17 | VCC | Positive supply terminal - requires local 0.1-µF ceramic bypass capacitor to minimize switching noise coupling. |
| 20 | GND | Ground reference - must be connected to low-impedance system ground plane to maintain signal integrity and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Data-flow-through pinout | Inputs (A1–A8) and outputs (Y1–Y8) on opposite sides of SO-20 package - reduces layer count and crosstalk in dense bus layouts. |
| High-current 3-state outputs | ±6 mA drive per output at 5 V - eliminates need for external bus transceivers when interfacing with multiple LSTTL loads. |
| Dual 3-state enable control | Separate OE1 and OE2 inputs with NOR logic - supports flexible bus arbitration schemes and partial-bus isolation. |
| TTL-compatible inputs | VIH = 2.0 V, VIL = 0.8 V at VCC = 4.5–5.5 V - ensures seamless integration with legacy 5-V microcontroller, FPGA, or ASIC I/O banks. |
| Low quiescent power | ICC ≤ 80 µA max - maintains sub-1-mW static power per buffer, critical for thermally constrained industrial enclosures. |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
Use Scenario: Adding isolated digital input/output channels to programmable logic controller backplanes using 5-V parallel buses. IC Role / Device Role / Timing Role: Bidirectional buffer isolating CPU address/data bus from field-side I/O modules during read/write cycles. Use Value: Enables hot-swap-safe 3-state control and meets 15-LSTTL fanout requirement without additional drivers. |
Use Scenario: Interfacing modern microcontrollers with legacy ISA or VMEbus peripherals requiring TTL-level signaling. IC Role / Device Role / Timing Role: Level-translating octal buffer providing timing-compliant data path between mismatched logic families. Use Value: Delivers 12 ns tpd and ±6 mA drive to satisfy setup/hold timing and termination needs of 8-bit synchronous transfers. |
| Test Equipment Signal Routing | Embedded System Address Latching |
Use Scenario: Multiplexing stimulus signals across multiple DUT channels in automated test equipment with shared resource constraints. IC Role / Device Role / Timing Role: 3-state-enabled signal distributor managing contention-free access to shared analog/digital resources. Use Value: Dual OE inputs allow hierarchical enable sequencing, reducing signal contention risk during channel switching. |
Use Scenario: Latching and driving 8-bit address segments in 8051 or Z80-based embedded controllers with limited I/O. IC Role / Device Role / Timing Role: Non-inverting buffer amplifying weak address lines to meet fanout and noise-margin requirements of memory chips. Use Value: 0.4 V VOL max at 6 mA ensures >0.4 V noise margin against LSTTL VIH, preventing false address decoding. |
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 |
|---|---|---|---|
| SN74HCT240N | Inverting outputs; dual 4-bit groups with separate OE controls; PDIP-20 only. | Requires logic inversion in signal path; less suitable for direct replacement where true-output behavior is required. | Select SN74HCT240N only when inverting functionality aligns with system-level signal polarity requirements. |
| SN74LV541APWR | Lower voltage range (2–5.5 V); LV-CMOS process; 3.3-V optimized; TSSOP-20 package. | Better suited for mixed-voltage 3.3-V/5-V systems but lacks guaranteed 5-V TTL input compatibility. | Choose SN74LV541APWR when migrating to 3.3-V core logic while retaining 5-V tolerant inputs and space-constrained layouts. |
Compared with SN74HCT541NS, SN74HCT240N provides inverted outputs and discrete group enables - useful for differential bus control but incompatible for true-output replacement. SN74LV541APWR offers wider voltage flexibility and smaller footprint but trades off guaranteed 5-V TTL input robustness for lower static power and 3.3-V optimization.
Availability
SN74HCT541NS is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, test equipment signal routing, and embedded system address latching requiring stable component supply and long-term production continuity.
Supply support for SN74HCT541NS 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 SN74HCT541NS belongs to TI's HCT logic family - engineered for 5-V TTL-compatible operation with CMOS power efficiency, targeting industrial control, instrumentation, and legacy-system interface applications.
FAQ
What is the operating voltage range for the SN74HCT541NS?
The SN74HCT541NS operates from 4.5 V to 5.5 V. This range ensures compatibility with standard 5-V power supplies while accommodating typical ±5% tolerance. Operation outside this range may cause functional failure or permanent damage, as specified in the absolute maximum ratings table of the official datasheet.
Does the SN74HCT541NS support true or inverted output logic?
The SN74HCT541NS provides true (non-inverting) output logic - each Y output replicates the logic state of its corresponding A input when enabled. This distinguishes it from inverting variants like the SN74HCT240, making SN74HCT541NS suitable for applications requiring direct signal pass-through without polarity reversal.
How many LSTTL loads can the SN74HCT541NS drive per output?
The SN74HCT541NS can drive up to 15 LSTTL loads per output, enabled by its ±6-mA output drive capability at 5 V. This specification is verified under recommended operating conditions and accounts for standard LSTTL input current requirements (IIL = −0.4 mA, IIH = 0.02 mA), ensuring reliable fanout without signal degradation.
What is the function of OE1 and OE2 on the SN74HCT541NS?
OE1 and OE2 are active-low 3-state enable inputs tied to a NOR gate - if either is high, all eight Y outputs enter high-impedance state. Both must be low to enable data flow from A to Y. This dual-control architecture supports flexible bus arbitration and partial-bus isolation in multi-master systems.
Is the SN74HCT541NS pin-compatible with other packages in the same family?
The SN74HCT541NS shares identical pinout and logic function with other SN74HCT541 variants (e.g., SN74HCT541N, SN74HCT541DW), including SOP-20, PDIP-20, and SOIC-20 packages. Mechanical dimensions differ, but electrical connectivity and signal assignment are fully consistent across these orderable variants.
SN74HCT541NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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-SO
SN74HCT541NS FAQ
1.How can I place an order for SN74HCT541NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT541NS 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 SN74HCT541NS reliable?
The price and inventory of SN74HCT541NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT541NS is usually 5 days.
3.What payment methods are accepted for SN74HCT541NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT541NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT541NS?
SN74HCT541NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT541NS 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 SN74HCT541NS?
For technical support, including SN74HCT541NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT541NS requirements.
6.How does Aetrix verify that SN74HCT541NS is sourced from the original manufacturer or authorized distributors?
All SN74HCT541NS 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 SN74HCT541NS meets industry standards.
7.What is the process for return or replacement of SN74HCT541NS?
All SN74HCT541NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT541NS, 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 SN74HCT541NS part is unused and in its original packaging.
Return procedure for SN74HCT541NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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