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onsemi MC74HCT541AN
- Part No.:
- MC74HCT541AN
- Manufacturer:
- onsemi
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
MC74HCT541AN.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,711
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Product details
Overview
MC74HCT541AN from onsemi is an octal non-inverting 3-state buffer/line driver IC designed for bidirectional data bus interface in TTL-compatible digital systems. It features 8 independent channels, 2V–6V supply voltage operation, ±4mA output drive at VCC = 4.5V, and guaranteed TTL-level input thresholds. It is commonly used in microcontroller I/O expansion and memory address/data bus buffering.
For engineers reviewing the MC74HCT541AN datasheet, pinout, applications, or equivalent options, key selection criteria include its 3-state control logic (active-low OE), propagation delay of 19ns max at VCC = 4.5V, and compatibility with both 5V TTL and CMOS logic families in mixed-voltage system interfacing.
Technical Context
The MC74HCT541AN implements eight identical non-inverting buffer stages, each with separate 3-state output enable (OE) control. All outputs are disabled when OE is high, presenting high-impedance state to prevent bus contention.
It uses silicon-gate CMOS technology to achieve TTL-compatible input levels while maintaining CMOS power efficiency. Input thresholds are fixed at VIL ≤ 0.8V and VIH ≥ 2.0V across the full 2V–6V supply range, ensuring robust noise immunity in industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible CMOS with 5V supply optimization and rail-to-rail input thresholds |
| Supply Voltage Range | 2.0V to 6.0V - supports mixed-voltage designs and legacy 5V systems |
| Output Drive | ±4mA at VCC = 4.5V - sufficient to drive 10 LSTTL loads or 20 HCMOS inputs |
| Propagation Delay | 19ns max (A→Y, VCC = 4.5V) - enables reliable operation up to ~25MHz bus rates |
| Input Thresholds | VIL ≤ 0.8V, VIH ≥ 2.0V - ensures deterministic switching with standard TTL outputs |
| Quiescent Current | ≤ 4µA at VCC = 6V - negligible static power draw in standby or high-Z states |
Pinout & Package
MC74HCT541AN is housed in a 20-pin plastic dual in-line package (PDIP) with 0.3-inch body width and standard through-hole mounting footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE (Active-Low Output Enable) | Global 3-state control for all 8 outputs; low = enabled, high = high-Z |
| 2–9 | A1–A8 (Inputs) | Non-inverting data inputs; TTL-compatible thresholds |
| 11–18 | Y1–Y8 (Outputs) | Buffered non-inverting outputs; 3-state capable, ±4mA drive |
| 10 | GND | Ground reference for logic and output stages |
| 20 | VCC | Positive supply rail (2V–6V); powers internal logic and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible input thresholds | Ensures direct interoperability with legacy 5V TTL outputs without level-shifting circuitry |
| Independent 3-state control | Single active-low OE pin simplifies bus arbitration logic and reduces PCB routing complexity |
| High noise immunity | Input hysteresis and wide VOH/VOL margins suppress false triggering in electrically noisy industrial settings |
| Low quiescent power | Sub-µA ICC in disabled state extends battery life in portable or always-on monitoring applications |
Applications
| Microcontroller I/O Expansion | Memory Address/Data Bus Buffering |
|---|---|
Use Scenario: Expanding GPIO count of an 8-bit MCU to drive external peripherals or indicators. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-state control acts as bidirectional data path extender between MCU port and peripheral bus. Use Value: Enables clean signal integrity and prevents bus contention during read/write cycles using OE synchronization. | Use Scenario: Isolating and driving address lines from a microprocessor to multiple memory chips. IC Role / Device Role / Timing Role: Octal buffer provides fan-out gain and timing margin for parallel address distribution. Use Value: Reduces loading on CPU address pins and maintains setup/hold timing across multi-chip memory banks. |
| Industrial PLC I/O Module | Legacy System Interface Adapter |
Use Scenario: Interfacing 5V TTL logic signals from field sensors to a 3.3V FPGA-based controller. IC Role / Device Role / Timing Role: Level-tolerant buffer isolates voltage domains while preserving signal polarity and timing. Use Value: Eliminates need for discrete level shifters; supports hot-swap-safe high-Z state during configuration. | Use Scenario: Retrofitting modern microcontrollers into aging instrumentation with 5V TTL backplanes. IC Role / Device Role / Timing Role: Bidirectional bus transceiver replacement in legacy test equipment control buses. Use Value: Maintains pin-compatible functionality with original 74LS541 while reducing power and improving noise margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal non-inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT541N | Identical electrical specs and pinout; manufactured by Texas Instruments | No functional difference; validated for same 5V TTL/CMOS interface roles | Select based on supply chain availability and qualification requirements |
| 74VHC541N | Higher speed (tPD = 7.5ns), lower drive (±8mA), wider VCC range (2–5.5V) | Better suited for high-speed 3.3V systems; not TTL-input compatible | Choose only if design operates below 3.6V and requires faster propagation |
Compared with SN74HCT541N and 74VHC541N, the MC74HCT541AN delivers identical TTL-compatible behavior and pinout but is qualified for extended temperature ranges (-55°C to +125°C) and offers onsemi's long-term industrial lifecycle support.
Availability
MC74HCT541AN is available at Aetrix Electronics and suitable for industrial control systems, legacy equipment upgrades, and embedded microcontroller interface applications requiring stable component supply over extended product lifecycles.
Supply support for MC74HCT541AN 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
onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74HCT541AN belongs to onsemi's Standard Logic family, engineered for reliability and compatibility in industrial and legacy-system interfacing where TTL-level signal integrity and long-term supply stability are critical.
FAQ
What is the maximum operating frequency supported by the MC74HCT541AN?
The MC74HCT541AN does not specify a clock frequency since it is a combinational buffer, not a clocked device. Its usable data rate depends on propagation delay: with tPD ≤ 19ns (VCC = 4.5V), it reliably supports asynchronous bus transfers up to approximately 25MHz under typical load conditions. System-level timing must account for board trace delays and capacitive loading.
Does the MC74HCT541AN support 3.3V logic inputs?
No - the MC74HCT541AN has TTL-compatible input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V), making it fully compatible with 5V TTL outputs but not guaranteed for direct connection to 3.3V CMOS outputs without level translation. For 3.3V systems, consider the 74VHC541 or 74LVC541 variants instead.
What is the function of Pin 1 and Pin 19 on the MC74HCT541AN?
Both Pin 1 and Pin 19 serve as the active-low Output Enable (OE) input for the MC74HCT541AN. They are internally tied together and provide redundant access points for OE control, simplifying PCB layout in dense designs. When OE is low, all eight outputs are enabled; when high, all outputs enter high-impedance state.
Is the MC74HCT541AN RoHS compliant?
Yes - the MC74HCT541AN is RoHS compliant and meets the EU Directive 2011/65/EU requirements. onsemi provides full material declarations and compliance documentation via its official product page and MyON portal. The PDIP package uses lead-free finish and halogen-free molding compound.
Can the MC74HCT541AN be used in automotive applications?
The MC74HCT541AN is not AEC-Q100 qualified and is not recommended for automotive safety-critical systems. However, it is rated for industrial temperature range (–55°C to +125°C) and may be used in non-safety automotive subsystems such as infotainment or body control modules, subject to customer qualification and derating per application requirements.
MC74HCT541AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
MC74HCT541AN FAQ
1.How can I place an order for MC74HCT541AN through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HCT541AN 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 MC74HCT541AN reliable?
The price and inventory of MC74HCT541AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HCT541AN is usually 5 days.
3.What payment methods are accepted for MC74HCT541AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HCT541AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HCT541AN?
MC74HCT541AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HCT541AN 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 MC74HCT541AN?
For technical support, including MC74HCT541AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HCT541AN requirements.
6.How does Aetrix verify that MC74HCT541AN is sourced from the original manufacturer or authorized distributors?
All MC74HCT541AN 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 MC74HCT541AN meets industry standards.
7.What is the process for return or replacement of MC74HCT541AN?
All MC74HCT541AN units undergo pre-shipment inspection (PSI). If there is an issue with MC74HCT541AN, 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 MC74HCT541AN part is unused and in its original packaging.
Return procedure for MC74HCT541AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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