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onsemi MC74LCX541MELG
- Part No.:
- MC74LCX541MELG
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC74LCX541MELG.pdf
- Description:
- IC BUF NON-INVERT 3.6V SOEIAJ-20
- Quantity:
- Payment:
- Shipping:
Inventory:1,197
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Product details
Overview
MC74LCX541MELG from onsemi is a low-voltage CMOS octal non-inverting 3-state buffer with flow-through pinout, 5 V-tolerant inputs/outputs, and 1.65–5.5 V supply operation. It delivers ±24 mA output drive at VCC = 3 V, supports −40 °C to +125 °C operation, and features dual independent output enables (OE1/OE2) for bus isolation in memory address driving and TTL-level bus transceiver applications.
For engineers reviewing the MC74LCX541MELG datasheet, pinout, applications, or equivalent options, key selection criteria include 5 V tolerance with sub-2 V logic compatibility, high-impedance TTL-compatible inputs, balanced sink/source drive, near-zero ICC in all states, and SOIC-20 WB package suitability for industrial bus interface designs.
Technical Context
The MC74LCX541MELG implements a flow-through architecture with D0–D7 inputs mapped directly to O0–O7 outputs, minimizing signal skew and enabling clean bus buffering without internal inversion or routing delay penalties. Its dual OE inputs (OE1, OE2) operate independently to place corresponding output groups into high-impedance state, supporting partial bus control.
Designed for mixed-voltage systems, it guarantees safe interfacing with 5 V TTL logic while operating from as low as 1.65 V, enabled by VIH/VIL thresholds scaling with VCC and absolute 5.5 V input voltage rating. IOFF protection ensures high-impedance outputs even when VCC = 0 V, supporting live insertion and hot-swap capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 5.5 V - Enables direct use in 1.8 V, 2.5 V, 3.3 V, and 5 V systems without level shifters. |
| Input Voltage Tolerance | −0.5 V to +6.5 V - Allows safe connection to 5 V drivers without external clamping or resistors. |
| Output Drive (3 V) | ±24 mA - Sufficient to drive 10 LVTTL loads or terminate short stubs on high-speed buses. |
| Propagation Delay | 5.9 ns max (VCC = 4.5–5.5 V) - Supports >100 MHz bus toggle rates in typical loading conditions. |
| ICC (Quiescent) | 10 µA max - Reduces standby power in battery-backed or always-on embedded controllers. |
| IOFF Leakage | 10 µA max at VCC = 0 V - Prevents backfeeding and maintains bus integrity during power sequencing. |
| ESD HBM | >2000 V - Meets industrial IEC 61000-4-2 system-level robustness requirements. |
Pinout & Package
MC74LCX541MELG is packaged in SOIC-20 WB (Case 751D), a 20-pin wide-body surface-mount package with 1.27 mm pitch, 12.8 mm × 7.5 mm body size, and 2.5 mm height. Pin 1 is marked with a notch or dot; pin numbering follows standard counter-clockwise sequence from top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Independent 3-state enable inputs - LOW activates corresponding output group; HIGH disables to high-Z. |
| 2–9 | D0–D7 | Data inputs - High-impedance TTL-compatible inputs reduce loading on upstream drivers. |
| 11–18 | O0–O7 | Non-inverting 3-state outputs - Balanced ±24 mA drive at 3 V supports bidirectional bus termination. |
| 10 | GND | Ground reference - Shared return path for all digital signals and supply decoupling. |
| 20 | VCC | Power supply - Must be decoupled with 0.1 µF ceramic capacitor close to pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| 5 V-Tolerant I/O | Supports mixed-voltage board design without level translators when interfacing with legacy 5 V peripherals. |
| Flow-Through Pinout | Minimizes PCB trace length between Dn and On pins, reducing crosstalk and skew across all eight channels. |
| Dual Independent OE | Enables selective gating of two 4-bit output groups (O0–O3 / O4–O7), improving bus arbitration granularity. |
| IOFF Protection | Guarantees high-impedance outputs during power-down, preventing current backflow in hot-plug or partial-power scenarios. |
| LVTTL/LVCMOS Compatibility | Meets both LVTTL VIH/VIL thresholds and LVCMOS switching levels, simplifying integration into heterogeneous logic families. |
Applications
| Memory Address Buffering | TTL-Level Bus Transceiver |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a low-voltage microcontroller to SRAM or Flash memory operating at 5 V. IC Role / Device Role / Timing Role: Non-inverting octal buffer isolating core logic from bus capacitance while maintaining timing integrity. Use Value: 5 V-tolerant inputs accept memory address signals directly; ±24 mA drive ensures fast edge rates into 50 pF load per line. |
Use Scenario: Bidirectional data bus isolation between a 3.3 V FPGA and legacy 5 V peripheral controller. IC Role / Device Role / Timing Role: Unidirectional buffer stage enabling voltage translation and bus contention prevention. Use Value: Dual OE allows synchronized enable/disable of data paths; flow-through layout minimizes added propagation delay. |
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|
Use Scenario: Expanding GPIO count on an ARM Cortex-M4 MCU to drive multiple 5 V relay drivers and optocouplers. IC Role / Device Role / Timing Role: Level-shifting buffer with high-noise immunity for noisy factory floor environments. Use Value: >2000 V HBM ESD rating and −40 °C to +125 °C operation ensure reliability in uncontrolled ambient conditions. |
Use Scenario: Interfacing a 1.8 V automotive microcontroller to 5 V CAN transceiver power domains and sensor interfaces. IC Role / Device Role / Timing Role: Voltage-tolerant signal conditioner for diagnostic and status lines in AEC-Q100 qualified systems. Use Value: -Q suffix variant available; IOFF and live-insertion support simplify modular ECU design and field serviceability. |
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 |
|---|---|---|---|
| SN74LVC541APWR | Single OE input; 1.65–3.6 V only; no 5 V tolerance - requires external clamping for 5 V inputs. | Limited to 3.3 V-only systems; unsuitable for direct 5 V interface without redesign. | Select when cost sensitivity outweighs 5 V interface need and board space permits clamping circuitry. |
| 74ALVC541PW | Higher speed (tPD = 3.3 ns @ 3.3 V); same 1.65–3.6 V range; no 5 V tolerance or IOFF. | Better for high-frequency data paths but lacks live-insertion and mixed-voltage robustness. | Prefer for timing-critical 3.3 V bus extensions where thermal margin and voltage flexibility are secondary. |
Compared with SN74LVC541APWR and 74ALVC541PW, MC74LCX541MELG uniquely combines 5 V tolerance, dual OE control, IOFF, and extended temperature range - making it the only choice for industrial or automotive bus isolation requiring zero external components and guaranteed hot-swap safety.
Availability
MC74LCX541MELG is available at Aetrix Electronics and suitable for memory address driving, TTL-level bus transceiver, and industrial I/O expansion applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MC74LCX541MELG 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 (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74LCX541MELG belongs to the LCX family of low-voltage CMOS logic devices, engineered specifically for mixed-voltage system interfacing with emphasis on robustness, low power, and seamless 5 V legacy integration.
FAQ
What is the maximum operating temperature for MC74LCX541MELG?
The MC74LCX541MELG is rated for continuous operation from −40 °C to +125 °C ambient temperature, meeting industrial and automotive under-hood requirements. This specification is validated per JEDEC JESD22-A104 and confirmed in the device's Recommended Operating Conditions table on page 4 of the official datasheet.
Does MC74LCX541MELG support live insertion?
Yes, MC74LCX541MELG supports live insertion and withdrawal due to its IOFF specification, which guarantees high-impedance outputs even when VCC = 0 V. This prevents back-driving of powered subsystems during hot-swap events, as verified in the Features section and DC Electrical Characteristics table (IOFF ≤ 10 µA).
What package type is used for MC74LCX541MELG?
MC74LCX541MELG uses the SOIC-20 WB (Wide Body) package, also designated Case 751D, with 20 leads, 1.27 mm pitch, and dimensions of 12.8 mm × 7.5 mm × 2.5 mm. This is confirmed in the Ordering Information table (page 8) and Mechanical Case Outline drawing (page 8) of the datasheet.
Can MC74LCX541MELG drive 5 V TTL loads directly?
Yes, MC74LCX541MELG can drive 5 V TTL loads directly: its outputs are 5 V-tolerant and deliver VOH ≥ VCC − 0.1 V and VOL ≤ 0.55 V at 24 mA sink, satisfying TTL VIH (≥2.0 V) and VIL (≤0.8 V) thresholds across the full 3.0–5.5 V VCC range per DC Electrical Characteristics (page 4).
Is MC74LCX541MELG RoHS compliant and lead-free?
Yes, MC74LCX541MELG is Pb-free, halogen-free/BFR-free, and RoHS compliant, as explicitly stated in the Features section (page 1) and confirmed in the Ordering Information (page 8), where the "G" suffix denotes Pb-Free packaging for all listed variants including MC74LCX541MELG.
MC74LCX541MELG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOEIAJ-20
MC74LCX541MELG FAQ
1.How can I place an order for MC74LCX541MELG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74LCX541MELG 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 MC74LCX541MELG reliable?
The price and inventory of MC74LCX541MELG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX541MELG is usually 5 days.
3.What payment methods are accepted for MC74LCX541MELG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LCX541MELG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74LCX541MELG?
MC74LCX541MELG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74LCX541MELG 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 MC74LCX541MELG?
For technical support, including MC74LCX541MELG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX541MELG requirements.
6.How does Aetrix verify that MC74LCX541MELG is sourced from the original manufacturer or authorized distributors?
All MC74LCX541MELG 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 MC74LCX541MELG meets industry standards.
7.What is the process for return or replacement of MC74LCX541MELG?
All MC74LCX541MELG units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX541MELG, 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 MC74LCX541MELG part is unused and in its original packaging.
Return procedure for MC74LCX541MELG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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