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onsemi MC74HCT541AFG
- Part No.:
- MC74HCT541AFG
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC74HCT541AFG.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOEIAJ-20
- Quantity:
- Payment:
- Shipping:
Inventory:3,501
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Product details
Overview
MC74HCT541AFG from onsemi is an octal non-inverting 3-state buffer/line driver IC designed for bus interface applications. It features TTL-compatible inputs, 5V supply operation, ±4mA output drive capability, propagation delay of 18ns (typ) at VCC = 5V, and operates across –40°C to +85°C. It is used in microcontroller address/data bus buffering and memory I/O expansion.
For engineers reviewing the MC74HCT541AFG datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage thresholds (VIL/VIH), output current capability, 3-state control timing, and compatibility with legacy 74HCT logic families in industrial control and instrumentation systems.
Technical Context
The MC74HCT541AFG implements eight independent non-inverting buffers, each with separate 3-state output control via two active-low enable inputs (1OE̅, 2OE̅). Its input structure accepts standard TTL voltage levels while operating from a single 4.5V–5.5V supply, ensuring interoperability with both CMOS and bipolar logic families.
Output stages are designed for high fan-out capability and bus-oriented bidirectional isolation: when enabled, outputs drive logic-high or logic-low; when disabled, they present high-impedance states with leakage current ≤ ±1μA. Propagation delays are tightly specified (tPLH/tPHL ≤ 25ns max) across full temperature and voltage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - ensures robust operation under industrial rail tolerances and brownout immunity |
| Input Logic Thresholds | VIL ≤ 0.8V, VIH ≥ 2.0V - guarantees reliable recognition of TTL-level signals without level-shifting |
| Output Drive Strength | ±4mA at VOH = 4.4V / VOL = 0.4V - supports direct interfacing to multiple 74HCT loads (fan-out ≥ 10) |
| Propagation Delay | 18ns (typ) at VCC = 5V - enables use in 25MHz+ synchronous bus environments |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial ambient conditions |
| 3-State Leakage | ±1μA max - prevents signal contention and power loss during bus arbitration |
Pinout & Package
MC74HCT541AFG is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with 0.300-inch body width and standard 1.27mm pitch. Pin numbering follows JEDEC MS-013AC, with pin 1 marked by notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Output Enable (1OE̅, 2OE̅) | Active-low controls for first four and last four buffers respectively; enables high-impedance state when high |
| 2–5, 14–17 | Data Inputs (1A–4A, 2A–5A) | Non-inverting TTL-compatible inputs driving corresponding outputs |
| 6–9, 18, 20 | Data Outputs (1Y–4Y, 2Y–5Y) | Buffered non-inverting outputs; tri-stated when respective OE̅ is high |
| 10 | GND | Ground reference for all logic and output stages |
| 20 | VCC | Positive supply terminal; must be decoupled locally per best practice |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Input Thresholds | Enables direct connection to legacy 74LS/74ALS outputs without level translation circuitry |
| Independent Dual 3-State Control | Allows selective gating of upper/lower nibbles for partial bus isolation in multiplexed architectures |
| High Noise Immunity | Input hysteresis and guaranteed VIL/VIH margins suppress false triggering in electrically noisy industrial enclosures |
| Low Power Consumption | Typical ICC = 4μA at standby - reduces system quiescent current in always-on control modules |
Applications
| Microcontroller Bus Expansion | Industrial PLC I/O Module |
|---|---|
Use Scenario: Expanding GPIO count on an 8-bit MCU by adding external parallel memory or peripheral chips. IC Role / Device Role / Timing Role: Bidirectional data bus buffer isolating MCU pins from capacitive loading of add-on peripherals. Use Value: Enables stable 8-bit parallel transfers up to 25MHz while preventing signal integrity degradation from stub traces. | Use Scenario: Isolating field-side digital inputs/outputs from controller backplane in modular programmable logic controllers. IC Role / Device Role / Timing Role: Level-shifting and bus-driving interface between isolated 24V input conditioning and 5V logic domain. Use Value: Provides galvanically referenced signal integrity and prevents ground loop coupling into sensitive logic circuits. |
| Legacy System Emulation | Test Equipment Signal Routing |
Use Scenario: Replacing obsolete 74LS244 in retro-computing hardware restoration projects. IC Role / Device Role / Timing Role: Drop-in functional replacement maintaining identical pinout and electrical behavior under 5V TTL rails. Use Value: Eliminates need for PCB redesign while restoring full compatibility with vintage bus timing specifications. | Use Scenario: Configurable signal path switching in automated test equipment (ATE) channel cards. IC Role / Device Role / Timing Role: Controlled routing node enabling dynamic assignment of DUT signals to measurement instruments. Use Value: Supports reconfigurable test fixtures with sub-20ns path latency and minimal crosstalk between adjacent channels. |
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 |
|---|---|---|---|
| SN74HCT244N | Same logic function and pinout; slightly higher tPZL/tPZH (27ns max vs. 25ns), identical VCC and IO specs | Widely available in PDIP; less common in narrow SOIC variants | Preferred for through-hole prototyping or legacy board repair where SOIC footprint is not required |
| 74VHC244M | Higher speed (tPD = 7.5ns typ), wider VCC range (2V–5.5V), but lower noise margin (VIH = 3.5V min at VCC = 5V) | Suitable for mixed-voltage systems; requires careful input threshold validation when driven by TTL sources | Best for new designs needing faster throughput and dual-supply flexibility, provided input compatibility is verified |
Compared with SN74HCT244N and 74VHC244M, the MC74HCT541AFG offers tighter propagation delay consistency, optimized TTL input thresholds for legacy interoperability, and industry-standard SOIC-20 packaging-making it ideal for industrial bus interface upgrades where timing predictability and drop-in replacement reliability are critical.
Availability
MC74HCT541AFG is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system modernization requiring stable component supply and long-term lifecycle assurance.
Supply support for MC74HCT541AFG 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 leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74HCT541AFG belongs to onsemi's legacy HCT logic family, engineered specifically for robust 5V TTL-CMOS interoperability in mission-critical industrial control and instrumentation systems.
FAQ
What is the maximum clock frequency supported by MC74HCT541AFG in bus applications?
The MC74HCT541AFG does not operate as a clocked device but functions as a combinatorial buffer. Its 18ns typical propagation delay supports reliable operation in synchronous bus systems up to approximately 25MHz, assuming setup/hold timing margins are maintained. For precise timing analysis, designers must account for trace delays and load capacitance when using MC74HCT541AFG in high-speed data paths.
Does MC74HCT541AFG support mixed-voltage operation between 3.3V and 5V domains?
No, MC74HCT541AFG is specified only for 4.5V–5.5V VCC operation and features TTL-compatible input thresholds-not 3.3V logic compatible. Driving its inputs from 3.3V sources may result in marginal or invalid logic levels. For 3.3V-to-5V translation, a dedicated level shifter or 74LVC-series buffer should be used instead of MC74HCT541AFG.
Can MC74HCT541AFG outputs be paralleled for higher current drive?
No-MC74HCT541AFG outputs must never be wired in parallel. Each output is independently controlled and lacks internal current-sharing design. Paralleling risks shoot-through current, thermal overstress, and undefined logic states. For increased drive strength, use discrete buffers or select a part with higher IOH/IOL ratings rather than paralleling MC74HCT541AFG outputs.
Is MC74HCT541AFG compliant with RoHS and REACH requirements?
Yes, MC74HCT541AFG is RoHS-compliant (Pb-free, halogen-free) and meets EU REACH SVHC requirements. Full compliance documentation-including material declarations and test reports-is available through onsemi's official product page and Aetrix Electronics' quality portal for MC74HCT541AFG.
How does the dual OE̅ control in MC74HCT541AFG improve system design flexibility?
The dual active-low output enables (1OE̅ and 2OE̅) allow independent control of two groups of four buffers. This enables partial bus isolation-for example, holding memory address lines active while tri-stating data lines during read/write transitions-reducing bus contention and simplifying timing in multi-peripheral systems using MC74HCT541AFG.
MC74HCT541AFG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOEIAJ-20
MC74HCT541AFG FAQ
1.How can I place an order for MC74HCT541AFG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HCT541AFG 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 MC74HCT541AFG reliable?
The price and inventory of MC74HCT541AFG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HCT541AFG is usually 5 days.
3.What payment methods are accepted for MC74HCT541AFG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HCT541AFG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HCT541AFG?
MC74HCT541AFG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HCT541AFG 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 MC74HCT541AFG?
For technical support, including MC74HCT541AFG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HCT541AFG requirements.
6.How does Aetrix verify that MC74HCT541AFG is sourced from the original manufacturer or authorized distributors?
All MC74HCT541AFG 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 MC74HCT541AFG meets industry standards.
7.What is the process for return or replacement of MC74HCT541AFG?
All MC74HCT541AFG units undergo pre-shipment inspection (PSI). If there is an issue with MC74HCT541AFG, 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 MC74HCT541AFG part is unused and in its original packaging.
Return procedure for MC74HCT541AFG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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