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onsemi MC74LCX541DW
- Part No.:
- MC74LCX541DW
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC74LCX541DW.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,238
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Product details
Overview
MC74LCX541DW 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 3 V, supports live insertion, and features IOFF protection for high-impedance state when VCC = 0 V. It is used in memory address driving and TTL-level bus transceiver applications.
For engineers reviewing the MC74LCX541DW datasheet, pinout, applications, or equivalent options, key selection criteria include 5 V tolerance with 1.65 V minimum VCC, 6.5 ns typical propagation delay at 3.3 V, dual OE control (OE1/OE2), SOIC-20 WB package compatibility, and AEC-Q100 qualification availability in automotive-grade variants.
Technical Context
The MC74LCX541DW implements eight independent non-inverting buffers, each with separate input (Dn) and 3-state output (On), controlled by two active-low output enable inputs (OE1, OE2). All outputs enter high-impedance state when either OE1 or OE2 is HIGH - enabling flexible bus isolation per half-octet group.
Its 5 V-tolerant I/O architecture allows direct interfacing with legacy 5 V TTL logic while operating from as low as 1.65 V, and its IOFF specification guarantees <10 µA power-off leakage even with 5.5 V applied to pins during VCC = 0 V conditions - critical for hot-swap and partial-power-down systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 5.5 V - enables single-supply operation across LVTTL, LVCMOS, and mixed-voltage system interfaces. |
| Input Voltage Tolerance | −0.5 V to +6.5 V - permits safe connection to 5 V drivers without level shifters or clamping diodes. |
| Output Drive (3 V) | ±24 mA - sufficient to drive 50 Ω transmission lines or multiple LVTTL loads under worst-case timing conditions. |
| Propagation Delay | 6.5 ns max at 3.0–3.6 V - ensures sub-150 MHz bus operation with margin for setup/hold timing closure. |
| IOFF Leakage | <10 µA at VCC = 0 V - prevents back-powering of powered-down rails and maintains signal integrity during hot-swap. |
| Quiescent ICC | <10 µA in all logic states - reduces static power in battery-backed or always-on subsystems. |
| ESD Rating | >2000 V HBM - meets industrial IEC 61000-4-2 baseline immunity requirements without external protection. |
Pinout & Package
MC74LCX541DW is housed in a 20-pin SOIC wide-body (SOIC-20 WB) package per case 751D, with 1.27 mm pitch, 12.8 mm × 7.5 mm body size, and 2.5 mm height. Pin 1 is top-left corner (notch-marked side), with GND at pin 10 and VCC at pin 20.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-HIGH output enable controls for first four and last four buffers respectively - enables independent tri-state control of D0–D3/O0–O3 and D4–D7/O4–O7 groups. |
| 2–9 | D0–D7 | Non-inverting data inputs - accept 5 V-tolerant signals; high-impedance TTL-compatible inputs reduce loading on upstream drivers. |
| 11–18 | O0–O7 | 3-state buffered outputs - provide balanced ±24 mA drive at 3 V and maintain logic levels within VOL/VOH specs up to 32 mA sink/source. |
| 10 | GND | Ground reference for all internal circuitry and I/O - must be low-inductance connection to minimize switching noise coupling. |
| 20 | VCC | Primary power supply - supplies core logic and output drivers; decoupling capacitor (0.1 µF ceramic) required within 5 mm. |
Key Features
| Feature | Design Value |
|---|---|
| 5 V-Tolerant I/O | Enables direct interface with 5 V TTL logic while operating from 1.65–5.5 V supply - eliminates level translators in mixed-voltage buses. |
| Flow-Through Pinout | Input-to-output alignment (D0→O0, D1→O1, etc.) minimizes PCB trace length and crosstalk in high-speed address/data routing. |
| IOFF Protection | Guarantees <10 µA leakage when VCC = 0 V - prevents unintended current paths during power sequencing or hot-swap events. |
| Low Static Power | <10 µA ICC in all three logic states - reduces quiescent power in always-on controllers and battery-sensitive applications. |
| Live Insertion Support | IOFF + 5 V tolerance allows safe board insertion/removal in powered-backplane systems without damaging host logic or the MC74LCX541DW. |
Applications
| Memory Address Buffering | TTL-Level Bus Transceiver |
|---|---|
|
Use Scenario: Driving 16-bit address bus from low-voltage microcontroller to 5 V SRAM or EPROM. IC Role / Device Role / Timing Role: Non-inverting octal buffer providing voltage-level translation and fanout amplification between 3.3 V MCU and 5 V memory. Use Value: Eliminates need for discrete level shifters; 6.5 ns propagation delay ensures timing compliance with 50 ns memory access cycles. |
Use Scenario: Isolating bidirectional data bus between 3.3 V FPGA and legacy 5 V peripheral controller. IC Role / Device Role / Timing Role: 3-state buffer enabling direction-controlled data transfer with dual OE inputs for half-bus granularity. Use Value: Dual OE (OE1/OE2) allows independent control of upper/lower byte lanes - simplifies bus arbitration logic and reduces gate count. |
| Hot-Swappable Backplane Interface | Industrial I/O Expansion Module |
|
Use Scenario: Adding modular I/O cards to powered industrial backplane with strict hot-swap safety requirements. IC Role / Device Role / Timing Role: Signal buffer with IOFF and 5 V tolerance protecting backplane from card insertion transients and power sequencing faults. Use Value: IOFF ensures no back-drive into unpowered card rails; 2000 V HBM ESD rating withstands handling discharge before system power-up. |
Use Scenario: Expanding GPIO count on PLC mainboard using isolated 3.3 V logic domain interfaced to 5 V field-side sensors/actuators. IC Role / Device Role / Timing Role: Level-shifting buffer isolating field-side 5 V signals from low-voltage control logic while maintaining noise immunity. Use Value: ±24 mA drive capability supports long traces to remote terminals; low input leakage (<5 µA) avoids false triggering on unterminated lines. |
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 |
|---|---|---|---|
| SN74LVC244APWR | Single OE control (not dual), 3.6 V max VCC, no IOFF spec, 24 mA drive at 3.3 V. | Lacks independent half-octet control and zero-VCC leakage protection - unsuitable for hot-swap or partial-power-down systems. | Select when only one global OE is needed and full 5 V tolerance is not required. |
| 74ALVC541PW | Same dual-OE flow-through layout, but 1.65–3.6 V only, no 5 V tolerance, 24 mA drive at 3.3 V. | Cannot interface directly with 5 V peripherals - requires external level shifting in mixed-voltage designs. | Select when system operates strictly at ≤3.6 V and cost sensitivity outweighs 5 V interface flexibility. |
Compared with SN74LVC244APWR and 74ALVC541PW, the MC74LCX541DW uniquely combines dual OE control, 5 V-tolerant I/O, and guaranteed IOFF behavior - making it the only option among the three qualified for live-insertion and true mixed-voltage bus bridging without additional components.
Availability
MC74LCX541DW is available at Aetrix Electronics and suitable for memory address buffering, TTL-level bus transceivers, hot-swappable backplane interfaces, and industrial I/O expansion modules requiring stable component supply and long-term manufacturability.
Supply support for MC74LCX541DW 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 specializing in energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74LCX541DW belongs to the LCX family of low-voltage CMOS logic devices designed for mixed-signal systems requiring robust voltage translation, low power, and high noise immunity in space-constrained industrial and automotive environments.
FAQ
What is the maximum supply voltage for the MC74LCX541DW?
The MC74LCX541DW supports a DC supply voltage (VCC) range of −0.5 V to +6.5 V, with recommended operation from 1.65 V to 5.5 V. Operation above 5.5 V is outside specification and may compromise reliability or cause permanent damage. The absolute maximum rating of 6.5 V applies only to transient conditions, not continuous operation.
Does the MC74LCX541DW support hot-swap functionality?
Yes, the MC74LCX541DW supports live insertion and withdrawal due to its IOFF specification, which guarantees high-impedance state and <10 µA leakage when VCC = 0 V - even with 5.5 V applied to I/O pins. This prevents back-driving powered rails and protects both the device and host system during hot-swap events.
What is the function of OE1 and OE2 on the MC74LCX541DW?
OE1 and OE2 are active-HIGH output enable inputs controlling two independent groups of four buffers: OE1 enables O0–O3 (driven by D0–D3), and OE2 enables O4–O7 (driven by D4–D7). When either OE is HIGH, its associated outputs go to high-impedance state - enabling flexible bus segmentation without external logic.
Is the MC74LCX541DW pin-compatible with the MC74LCX244?
No, the MC74LCX541DW is not pin-compatible with the MC74LCX244. While functionally similar as octal non-inverting buffers, the MC74LCX541DW uses a flow-through pinout (D0–D7 on pins 2–9, O0–O7 on pins 11–18), whereas the MC74LCX244 uses a folded layout with interleaved I/O. PCB layout and routing must be redesigned for substitution.
What package type is used for the MC74LCX541DW?
The MC74LCX541DW is packaged in a 20-pin SOIC wide-body (SOIC-20 WB) per case outline 751D, with 1.27 mm pitch, 12.8 mm × 7.5 mm body dimensions, and Pb-free (RoHS-compliant) construction. This package is distinct from the TSSOP-20 variant (MC74LCX541DT), which uses case 948E and has different thermal and mechanical characteristics.
MC74LCX541DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
MC74LCX541DW FAQ
1.How can I place an order for MC74LCX541DW through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74LCX541DW 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 MC74LCX541DW reliable?
The price and inventory of MC74LCX541DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX541DW is usually 5 days.
3.What payment methods are accepted for MC74LCX541DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LCX541DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74LCX541DW?
MC74LCX541DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74LCX541DW 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 MC74LCX541DW?
For technical support, including MC74LCX541DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX541DW requirements.
6.How does Aetrix verify that MC74LCX541DW is sourced from the original manufacturer or authorized distributors?
All MC74LCX541DW 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 MC74LCX541DW meets industry standards.
7.What is the process for return or replacement of MC74LCX541DW?
All MC74LCX541DW units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX541DW, 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 MC74LCX541DW part is unused and in its original packaging.
Return procedure for MC74LCX541DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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