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onsemi MC74HCT541AFELG
- Part No.:
- MC74HCT541AFELG
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC74HCT541AFELG.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOEIAJ-20
- Quantity:
- Payment:
- Shipping:
Inventory:4,967
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Product details
Overview
MC74HCT541AFELG from onsemi is an octal non-inverting 3-state buffer/line driver IC used for bus interface and data isolation in TTL-compatible digital systems. It operates at 4.5–5.5 V, features 8-channel independent enable control, 7.5 ns typical propagation delay (VCC = 5 V, CL = 15 pF), and ±4 mA output drive capability. It is commonly deployed in microcontroller I/O expansion and memory address/data bus buffering.
For engineers reviewing the MC74HCT541AFELG datasheet, pinout, applications, or equivalent options, key selection considerations include its TTL-compatible input thresholds, 3-state output control per channel group, high noise immunity (400 mV minimum VIH hysteresis), and SOIC-20 package compatibility with industrial temperature range operation.
Technical Context
The MC74HCT541AFELG implements dual 4-bit non-inverting buffer sections, each with independent active-low output-enable (OE) control. Its CMOS HCT logic family ensures TTL-level input compatibility while delivering CMOS power efficiency and noise margin.
All inputs are equipped with hysteresis to suppress switching noise, and outputs support high-current sinking and sourcing (±4 mA) under full rail conditions. The device meets JEDEC standard JESD78 for latch-up immunity and is rated for operation across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible inputs with CMOS output drive and low static current |
| Supply Voltage | 4.5 V to 5.5 V - Ensures robust operation across industrial 5 V rail tolerances |
| Propagation Delay | 7.5 ns max (VCC = 5 V, CL = 15 pF) - Supports 100+ MHz bus timing in synchronous interfaces |
| Output Drive | ±4 mA (VOH/VOL @ VCC = 4.5 V) - Sufficient to drive 10 LSTTL loads or terminate short PCB traces |
| Input Hysteresis | ≥400 mV - Reduces susceptibility to ground bounce and EMI-induced false triggering |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded control and instrumentation |
Pinout & Package
MC74HCT541AFELG is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with 0.300-inch body width and standard 1.27 mm pitch. Pin assignment follows JEDEC MS-013AC, with dual OE controls enabling independent gating of two 4-bit groups.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 (Active-Low) | Independent 3-state enables for Group A (pins 2–5) and Group B (pins 13–16) |
| 2–5, 13–16 | A1–A4, B1–B4 Inputs | TTL-compatible inputs driving respective output buffers |
| 3–6, 14–17 | Y1–Y4, Y5–Y8 Outputs | Non-inverting 3-state outputs with ±4 mA drive strength |
| 10 | GND | Ground reference for logic and output stages |
| 20 | VCC | Positive supply rail (4.5–5.5 V); decoupling required within 1 cm |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - Enables direct interfacing with legacy 5 V TTL and LSTTL logic without level shifters |
| Dual Independent Output Enables | OE1 and OE2 allow selective isolation of two 4-bit data paths - critical for multiplexed address/data buses |
| High Noise Immunity | 400 mV input hysteresis minimizes metastability during noisy transitions - essential in mixed-signal industrial environments |
| Low Static Power Consumption | ICC ≤ 4 µA at VCC = 5.5 V - Enables use in always-on control modules without thermal derating |
Applications
| Microcontroller I/O Expansion | Memory Bus Interface |
|---|---|
Use Scenario: Expanding GPIO count of an 8-bit MCU to drive multiple peripheral devices on shared data lines. IC Role / Device Role / Timing Role: Bidirectional bus buffer isolating MCU pins from load capacitance and contention during read/write cycles. Use Value: Prevents signal integrity degradation and allows safe hot-plug of peripherals without resetting the host controller. | Use Scenario: Isolating address/data lines between a microprocessor and SRAM or EPROM in a 16-bit embedded system. IC Role / Device Role / Timing Role: Non-inverting 3-state driver enabling time-multiplexed access to shared memory space. Use Value: Eliminates bus contention during DMA transfers and supports clean address latching with sub-10 ns timing margins. |
| Industrial PLC Backplane | Legacy Instrumentation Interface |
Use Scenario: Buffering digital I/O signals across modular rack-mounted I/O cards in a programmable logic controller. IC Role / Device Role / Timing Role: Level-shifting and fan-out amplifier for 5 V TTL-compatible fieldbus signaling. Use Value: Maintains signal fidelity over 10+ cm backplane traces and withstands repeated hot-swap events per IEC 61000-4-2. | Use Scenario: Interfacing modern microcontrollers to vintage test equipment with TTL-level parallel ports (e.g., GPIB auxiliary handshaking). IC Role / Device Role / Timing Role: Signal conditioner ensuring compatible voltage thresholds and drive strength for legacy handshake protocols. Use Value: Enables drop-in replacement of obsolete 74LS541 without redesigning PCB layout or firmware timing. |
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 | DIP-20 package; identical electrical specs and pinout; no thermal pad | Suitable for prototyping and through-hole assembly; lacks SOIC thermal performance | Select when manual soldering or breadboard validation is required |
| 74VHC541M | Higher speed (5.5 ns typ), wider VCC range (2–5.5 V), but TTL input thresholds not guaranteed | Better for mixed-voltage systems; requires external pull-ups if interfacing with pure TTL | Choose for 3.3 V/5 V hybrid designs where input compatibility is verified externally |
Compared with SN74HCT541N and 74VHC541M, the MC74HCT541AFELG offers optimized industrial reliability in SOIC-20 with guaranteed TTL input behavior and superior thermal dissipation - making it preferred for volume production in temperature-stressed environments.
Availability
MC74HCT541AFELG is available at Aetrix Electronics and suitable for industrial automation, embedded instrumentation, and legacy system upgrades requiring stable component supply and long-term manufacturability.
Supply support for MC74HCT541AFELG 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 MC74HCT541AFELG belongs to onsemi's Standard Logic portfolio, designed specifically for robust, pin-compatible replacements of legacy 74-series TTL and CMOS logic in industrial and infrastructure systems.
FAQ
What is the maximum operating frequency supported by the MC74HCT541AFELG?
The MC74HCT541AFELG does not specify a maximum clock frequency, as it is a combinational buffer-not a clocked device. However, with a typical propagation delay of 7.5 ns and output rise/fall times under 6 ns (VCC = 5 V), it reliably supports data bus toggling up to approximately 100 MHz in well-terminated, low-capacitance layouts. System-level timing must account for board trace delays and loading effects on the MC74HCT541AFELG outputs.
Does the MC74HCT541AFELG support hot-swap or live-insertion?
The MC74HCT541AFELG is not explicitly qualified for hot-swap operation per IEEE 1394 or similar standards. While its 3-state outputs and latch-up immunity (per JESD78) provide inherent robustness, safe live insertion requires external current-limiting resistors and controlled power sequencing. For dedicated hot-swap applications, consider purpose-built hot-swap controllers instead of relying solely on the MC74HCT541AFELG.
Can the MC74HCT541AFELG drive LED indicators directly?
Yes - the MC74HCT541AFELG can sink or source up to ±4 mA per output, sufficient to drive low-current LEDs (e.g., 2 mA @ 1.8 V forward voltage) with appropriate series resistance. For higher-brightness or multi-LED loads, external transistor buffering is recommended. Always verify VOL remains ≤0.4 V and VOH ≥4.4 V under actual load conditions when using MC74HCT541AFELG for LED drive.
Is the MC74HCT541AFELG RoHS compliant and lead-free?
Yes - the MC74HCT541AFELG is RoHS compliant and manufactured with lead-free terminations per onsemi's product compliance documentation. The "G" suffix in the part number denotes green (halogen-free, Pb-free) packaging. Full material declarations and certificate of compliance are available via onsemi's quality portal for the MC74HCT541AFELG.
How does the input hysteresis of the MC74HCT541AFELG improve system reliability?
The MC74HCT541AFELG incorporates ≥400 mV of input hysteresis to prevent oscillation or chatter during slow-rising or noisy input transitions - common in industrial settings with long cables or shared grounds. This feature ensures clean, single-event logic recognition even with marginal slew rates, reducing firmware-level debouncing overhead and improving deterministic timing in real-time control loops using the MC74HCT541AFELG.
MC74HCT541AFELG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
MC74HCT541AFELG FAQ
1.How can I place an order for MC74HCT541AFELG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HCT541AFELG 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 MC74HCT541AFELG reliable?
The price and inventory of MC74HCT541AFELG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HCT541AFELG is usually 5 days.
3.What payment methods are accepted for MC74HCT541AFELG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HCT541AFELG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HCT541AFELG?
MC74HCT541AFELG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HCT541AFELG 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 MC74HCT541AFELG?
For technical support, including MC74HCT541AFELG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HCT541AFELG requirements.
6.How does Aetrix verify that MC74HCT541AFELG is sourced from the original manufacturer or authorized distributors?
All MC74HCT541AFELG 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 MC74HCT541AFELG meets industry standards.
7.What is the process for return or replacement of MC74HCT541AFELG?
All MC74HCT541AFELG units undergo pre-shipment inspection (PSI). If there is an issue with MC74HCT541AFELG, 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 MC74HCT541AFELG part is unused and in its original packaging.
Return procedure for MC74HCT541AFELG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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