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Texas Instruments SN74HCT541N
- Part No.:
- SN74HCT541N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74HCT541N.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,045
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Product details
Overview
SN74HCT541N from Texas Instruments is an octal non-inverting buffer/line driver with 3-state outputs in a 20-pin PDIP package, operating at 4.5–5.5 V, delivering ±6 mA output drive, 12 ns typical propagation delay, and TTL-compatible inputs for bus interfacing and signal isolation in industrial control and data acquisition systems.
For engineers reviewing the SN74HCT541N datasheet, SN74HCT541N pinout, SN74HCT541N application, or SN74HCT541N equivalent, key selection criteria include 3-state enable logic (dual OE inputs), high-current 3-state outputs capable of driving up to 15 LSTTL loads, low 80 µA max ICC quiescent current, and data flow-through pinout optimized for PCB layout.
Technical Context
The SN74HCT541N implements eight independent non-inverting buffers, each with true (non-inverted) output logic and dual active-low 3-state enable inputs (OE1 and OE2) wired as a 2-input NOR gate - asserting either OE1 or OE2 high places all outputs in high-impedance state. It belongs to the HCT logic family, ensuring TTL-voltage compatibility while using CMOS circuitry for low power consumption.
Its design emphasizes board-level signal integrity: inputs are on one side (pins 1–10), outputs on the opposite side (pins 11–20), enabling straight-through routing without layer jumps. The device meets recommended operating conditions of –40°C to +85°C ambient temperature and supports CL = 50 pF and 150 pF load configurations with characterized tpd, ten, tdis, and tt timing parameters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V digital systems and tolerance against rail droop. |
| Output drive | ±6 mA at 5 V - sufficient to directly interface with system buses or drive up to 15 LSTTL loads without external buffering. |
| Propagation delay | 12 ns typical (VCC = 5.5 V, CL = 50 pF) - enables reliable operation in medium-speed digital control and address/data latching applications. |
| Quiescent current | 80 µA max - minimizes standby power in battery-backed or energy-sensitive embedded subsystems. |
| Input compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - allows seamless integration with legacy TTL logic without level-shifting circuitry. |
| 3-state enable logic | Dual active-low OE inputs (OE1/OE2) with NOR function - provides flexible bus arbitration and multi-driver contention control. |
| Power dissipation capacitance | 35 pF per buffer - enables accurate dynamic power estimation in high-frequency switching scenarios. |
Pinout & Package
SN74HCT541N is housed in a 20-pin Plastic Dual In-line Package (PDIP) with 25.40 mm × 6.35 mm body size and through-hole mounting. Pin 1 is located at the left end of the top row (notch-side indicator), with inputs on pins 1–10 and outputs on pins 11–20 - enabling direct trace routing across the board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Input A1–A8 | True logic inputs driving corresponding non-inverting buffer outputs Y1–Y8. |
| 9, 10 | OE1, OE2 | Active-low 3-state enable inputs; either high forces all outputs into high-Z state (NOR logic). |
| 11, 13, 14, 15, 16, 17, 18, 20 | Output Y1–Y8 | Non-inverting buffered outputs with 3-state capability; pinout mirrors input order for layout efficiency. |
| 12 | GND | Ground reference for logic and power return path; must be low-impedance connection. |
| 19 | VCC | Positive supply terminal (4.5–5.5 V); requires local 0.1 µF bypass capacitor adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Data flow-through pinout | Inputs (pins 1–10) and outputs (pins 11–20) on opposite sides - eliminates cross-layer routing and reduces parasitic coupling in dense PCB layouts. |
| High-current 3-state outputs | ±6 mA drive strength at 5 V - supports direct fanout to multiple LSTTL loads without external drivers or termination resistors. |
| TTL-compatible inputs | VIH = 2 V, VIL = 0.8 V - interoperates with legacy 5 V TTL families (e.g., 74LS, 74F) without level translation. |
| Low quiescent power | 80 µA max ICC - enables use in always-on monitoring circuits where thermal and energy budgets are constrained. |
| Dual 3-state enable control | OE1 and OE2 form a NOR gate - allows hierarchical bus enable schemes (e.g., global + local control) for flexible system partitioning. |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
|
Use Scenario: Isolating microcontroller GPIO from noisy 24 V industrial fieldbus signals via optocoupler-driven input conditioning and relay-output staging. IC Role / Device Role / Timing Role: Buffering and directionally isolating parallel address/data lines between MCU and isolated peripheral modules while maintaining timing integrity. Use Value: Enables clean signal transmission across isolation barriers with minimal added propagation delay (12 ns typ) and robust noise immunity due to HCT's hysteresis-free TTL thresholds. |
Use Scenario: Adapting modern ARM-based controllers to legacy ISA or VME backplanes requiring 5 V TTL-compatible signaling and bus contention management. IC Role / Device Role / Timing Role: Serving as bidirectional data latch and bus driver with 3-state control synchronized to bus grant/acknowledge handshaking. Use Value: Provides ±6 mA drive and 15-LSTTL fanout to meet legacy bus loading requirements while supporting hot-swap-safe high-Z states during arbitration. |
| Test Equipment Signal Conditioning | Automotive Diagnostic Interface |
|
Use Scenario: Routing and buffering digital stimulus/response signals in automated test equipment (ATE) where signal fidelity and channel-to-channel skew must be minimized. IC Role / Device Role / Timing Role: Parallel signal distribution hub with matched trace lengths enabled by symmetric input/output pin placement. Use Value: Data flow-through layout reduces interconnect skew; 12 ns tpd ensures sub-100 ns timing margins for 10 MHz pattern generation and capture. |
Use Scenario: Interfacing an automotive ECU's internal 5 V logic domain to external OBD-II diagnostic tools using standardized UART or K-Line protocols. IC Role / Device Role / Timing Role: Level-shifting and buffering serial control lines while providing ESD-tolerant I/O (±20 mA clamp current) and fail-safe high-Z default on power loss. Use Value: TTL-compatible inputs accept open-collector K-Line signals; 3-state outputs prevent bus conflicts during ECU reset or sleep transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT240N | Inverting outputs (Y = NOT A); identical supply range, drive, and timing specs. | Suitable where signal polarity inversion is required (e.g., active-low enable chains, complementary bus drivers). | Select SN74HCT240N only when inverted logic is explicitly needed; otherwise SN74HCT541N preserves signal polarity. |
| SN74ACT541N | Faster tpd (9 ns typ), higher drive (±24 mA), but requires tighter VIH/VIL (3.5 V/1.5 V) - not TTL-compatible. | Better for high-speed 5 V systems with CMOS-only sources; unsuitable for mixed TTL/CMOS environments. | Choose SN74ACT541N for speed-critical designs with pure CMOS drivers; retain SN74HCT541N for TTL interoperability. |
Compared with SN74HCT240N and SN74ACT541N, the SN74HCT541N uniquely balances TTL compatibility, non-inverting functionality, and moderate speed-making it optimal for legacy interface consolidation, industrial I/O expansion, and mixed-signal boundary applications where signal polarity and voltage threshold alignment are critical.
Availability
SN74HCT541N is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, test equipment signal conditioning, and automotive diagnostic interfaces requiring stable component supply and long-term obsolescence management.
Supply support for SN74HCT541N 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 50 years of innovation in industrial, automotive, and communications markets.
The SN74HCT541N belongs to TI's HCT logic family, designed specifically to bridge TTL and CMOS domains-delivering TTL-compatible input thresholds with CMOS power efficiency and noise immunity for robust industrial and instrumentation applications.
FAQ
What is the maximum operating temperature range for the SN74HCT541N?
The SN74HCT541N is rated for an operating free-air temperature range of –40°C to +85°C, making it suitable for industrial environments including factory automation, motor control cabinets, and outdoor instrumentation enclosures where ambient temperatures may fluctuate significantly. This rating is confirmed in Section 5.2 of the official TI datasheet SCLS306E.
Does the SN74HCT541N require external pull-up or pull-down resistors on its OE inputs?
No, the SN74HCT541N does not require external pull-up or pull-down resistors on OE1 or OE2 if they are actively driven - however, unused OE inputs must be held at a defined logic level (VCC or GND) per TI's SCBA004 application report. Leaving them floating risks undefined output states and increased ICC. The SN74HCT541N itself has no internal weak pull-ups or pull-downs on these pins.
Can the SN74HCT541N drive a 50 Ω transmission line directly?
No, the SN74HCT541N is not designed for direct 50 Ω transmission line driving. Its ±6 mA output drive corresponds to ~833 Ω effective impedance at 5 V, optimized for LSTTL fanout (15 loads) and PCB trace routing-not RF or high-speed serial line termination. For 50 Ω lines, use dedicated line drivers like SN65LVDSxx or SN75ALS1xx series instead of SN74HCT541N.
Is the SN74HCT541N RoHS compliant?
Yes, the SN74HCT541N is RoHS compliant, as confirmed in TI's Package Option Addendum (SCLS306E, page Addendum-Page 1), which lists "Yes" under RoHS for orderable part number SN74HCT541N. It uses NiPdAu (NIPDAU) lead finish and meets JEDEC J-STD-020 moisture sensitivity requirements for lead-free assembly.
How does the dual OE architecture of the SN74HCT541N improve system-level bus control?
The SN74HCT541N's dual OE1/OE2 inputs implement a NOR logic function: asserting either high disables all outputs simultaneously. This allows hierarchical bus control - e.g., OE1 as global enable and OE2 as local module select - reducing control signal count and enabling fail-safe shutdown (e.g., OE1 tied to system watchdog). This architecture is intrinsic to the SN74HCT541N and distinct from single-OE alternatives.
SN74HCT541N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74HCT541N FAQ
1.How can I place an order for SN74HCT541N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT541N 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 SN74HCT541N reliable?
The price and inventory of SN74HCT541N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT541N is usually 5 days.
3.What payment methods are accepted for SN74HCT541N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT541N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT541N?
SN74HCT541N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT541N 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 SN74HCT541N?
For technical support, including SN74HCT541N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT541N requirements.
6.How does Aetrix verify that SN74HCT541N is sourced from the original manufacturer or authorized distributors?
All SN74HCT541N 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 SN74HCT541N meets industry standards.
7.What is the process for return or replacement of SN74HCT541N?
All SN74HCT541N units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT541N, 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 SN74HCT541N part is unused and in its original packaging.
Return procedure for SN74HCT541N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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