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onsemi MC74AC541MELG
- Part No.:
- MC74AC541MELG
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MC74AC541MELG.pdf
- Description:
- IC BUFF NON-INVERT 6V SOEIAJ-20
- Quantity:
- Payment:
- Shipping:
Inventory:4,013
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Product details
Overview
MC74AC541MELG from onsemi is an octal noninverting buffer/line driver with 3-state outputs, designed for memory and address bus interfacing, clock distribution, and microprocessor output port expansion. It operates from 2.0 V to 6.0 V, delivers ±24 mA output drive, supports flow-through pinout (inputs on one side, outputs on the other), and features high-impedance outputs when enabled via dual OE controls.
For engineers reviewing the MC74AC541MELG datasheet, pinout, applications, or equivalent options, this page provides verified functional identity, SOIC-20W package mapping, truth-table–confirmed 3-state behavior, propagation delay specs at 5.0 V (tPLH/tPHL ≤ 6.5 ns), and validated alternatives for bus driver replacement in industrial control and embedded systems.
Technical Context
The MC74AC541MELG implements TTL-compatible AC logic with noninverting data paths across eight channels, each independently controllable via two active-low output-enable inputs (OE1, OE2). Its flow-through architecture places inputs on pins 1–10 and outputs on pins 11–20, enabling direct microprocessor bus connection without signal layer crossover.
It meets AC logic voltage thresholds (VIH = 2.1 V min at VCC = 3.0 V; VIL = 0.9 V max), guarantees 3-state leakage ≤ ±5.0 µA, and maintains stable VOH ≥ 4.4 V and VOL ≤ 0.44 V under 24 mA load at 5.0 V - all specified over −40°C to +85°C ambient operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74AC - advanced CMOS with TTL-compatible input thresholds and low power |
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing (e.g., 3.3 V or 5 V buses) |
| Output Drive | ±24 mA - sufficient to drive 50 Ω transmission lines or multiple TTL loads without external buffers |
| Propagation Delay | ≤ 6.5 ns at VCC = 5.0 V, CL = 50 pF - enables reliable operation in sub-100 MHz digital timing domains |
| 3-State Enable Time | tPZH ≤ 9.5 ns, tPZL ≤ 8.5 ns at 5.0 V - ensures fast bus arbitration and minimal contention window |
| Input Capacitance | 4.5 pF typical - minimizes loading on upstream drivers and preserves signal edge integrity |
| Quiescent ICC | ≤ 80 µA at VCC = 5.5 V - supports low-power standby modes in battery-backed or energy-sensitive designs |
Pinout & Package
MC74AC541MELG is housed in a Pb-free SOIC-20 wide-body (Case 751D) package measuring 12.8 mm × 7.5 mm × 2.5 mm, with 1.27 mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data Inputs D1–D8 | Noninverting logic inputs accepting TTL/CMOS levels; tied directly to microprocessor data/address bus lines |
| 9, 10 | Output Enable Inputs OE1, OE2 | Active-low enables; both must be LOW to activate all eight outputs; supports independent bus segment control |
| 11, 12, 13, 14, 15, 16, 17, 18 | Outputs Y1–Y8 | Noninverting buffered outputs; enter high-impedance state when either OE is HIGH |
| 20 | VCC | Positive supply rail - decoupling capacitor required within 10 mm for noise immunity |
| 10 | GND | Ground reference - shared return path for all I/O and supply currents |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs on left side (pins 1–10), outputs on right side (pins 11–20) - eliminates PCB trace crossovers and reduces routing congestion in dense bus layouts |
| Dual 3-state enable | Separate OE1/OE2 inputs allow partitioning of the eight outputs into two groups of four - enables interleaved bus access or multi-master arbitration |
| High-output current | ±24 mA sink/source per output - drives standard TTL loads (up to 10 units) or 50 Ω transmission lines without external buffering |
| Pb-free construction | RoHS-compliant packaging (G suffix) - meets IPC/JEDEC J-STD-020 reflow profiles and automotive AEC-Q200 stress requirements |
| Wide VCC range | 2.0 V to 6.0 V operation - interoperable with 3.3 V microcontrollers and legacy 5 V peripherals in mixed-supply systems |
Applications
| Industrial PLC I/O Expansion | Embedded Microprocessor Bus Interface |
|---|---|
Use Scenario: Adding parallel digital I/O capability to a programmable logic controller using a 16-bit address/data multiplexed bus. IC Role / Device Role / Timing Role: Noninverting octal buffer isolating CPU data lines from field-side relay drivers while providing 3-state control for bus sharing. Use Value: Enables clean bidirectional bus handshaking with <6.5 ns propagation delay and <9.5 ns enable time - reducing cycle overhead in real-time scan logic. |
Use Scenario: Interfacing an ARM Cortex-M4 GPIO bank to external SRAM with separate address and data lines. IC Role / Device Role / Timing Role: Address latch buffer driving 8-bit address segments with flow-through layout to minimize trace length and skew. Use Value: Eliminates need for layer transitions on 4-layer PCBs; 4.5 pF input capacitance prevents signal degradation at 25 MHz bus clock rates. |
| Legacy System Memory Upgrade | Test Equipment Signal Conditioning |
Use Scenario: Replacing obsolete 74LS244 in a vintage instrumentation backplane to extend product lifecycle without board redesign. IC Role / Device Role / Timing Role: Pin-compatible octal noninverting driver delivering LS-equivalent fanout with lower power and higher noise margin. Use Value: Maintains identical SOIC-20 footprint and logic function while improving VIH/VIL margins (2.1 V/0.9 V at 3.0 V) and reducing ICC by >90% vs. LS technology. |
Use Scenario: Level-shifting and buffering TTL-level trigger signals between modular test instruments operating at different supply voltages. IC Role / Device Role / Timing Role: Bidirectional voltage translator enabling 3.3 V logic to drive 5 V measurement modules via controlled 3-state isolation. Use Value: Supports seamless interoperation across 2.0–6.0 V domains with guaranteed VOL ≤ 0.44 V at 24 mA - ensuring robust low-level recognition in sensitive analog subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC74ACT541DWG | TTL-compatible inputs (VIH = 2.0 V min at 4.5 V); slightly faster tPLH/tPHL (≤ 8.0 ns vs. ≤ 6.5 ns at 5 V) | Better suited for legacy 5 V TTL systems requiring strict input threshold compliance | Select when interfacing with older 74LS/74F logic families where input hysteresis or noise immunity is critical |
| SN74LVC244APWR | 3.3 V only (1.65–3.6 V), lower drive (±24 mA same), smaller TSSOP-20 package, higher speed (tPD ≤ 5.6 ns) | Optimized for modern low-voltage embedded systems; not compatible with 5 V buses | Choose for space-constrained 3.3 V designs needing reduced power and improved ESD rating (±2 kV HBM) |
Compared with MC74AC541MELG, MC74ACT541DWG offers tighter input compatibility with legacy TTL but requires 4.5–5.5 V operation, while SN74LVC244APWR delivers superior speed and density at 3.3 V but lacks 5 V tolerance - making MC74AC541MELG the optimal choice for mixed-voltage or upgrade-replacement use cases.
Availability
MC74AC541MELG is available at Aetrix Electronics and suitable for industrial automation, embedded microcontroller interfaces, and legacy system upgrades requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing.
Supply support for MC74AC541MELG 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, and IoT applications.
The MC74AC541MELG belongs to onsemi's 74AC logic family - engineered for high-speed, low-power bus interface and memory expansion in industrial control, instrumentation, and computing systems where reliability and wide supply range are essential.
FAQ
What is the maximum operating temperature range for MC74AC541MELG?
The MC74AC541MELG is rated for operation from −40°C to +85°C ambient temperature. This range is fully supported by its DC and AC specifications, including VOH/VOL, propagation delay, and 3-state leakage, as confirmed in the Recommended Operating Conditions table on page 3 of the official datasheet. The device's junction temperature limit is 140°C, allowing safe operation under typical industrial thermal conditions when mounted with standard SOIC-20 thermal guidelines.
Does MC74AC541MELG support 3.3 V operation?
Yes, MC74AC541MELG supports 3.3 V operation with full parameter guarantee: VIH = 1.5 V min, VIL = 0.9 V max, VOH ≥ 2.9 V, VOL ≤ 0.44 V, and tPLH/tPHL ≤ 7.5 ns at VCC = 3.3 V and CL = 50 pF. These values are explicitly listed in the AC and DC Characteristics tables (pages 4–5), confirming reliable interoperability with 3.3 V microcontrollers and FPGAs without level shifters.
What is the pin configuration difference between MC74AC541MELG and MC74AC540MELG?
MC74AC541MELG is the noninverting octal buffer, while MC74AC540MELG is its inverting counterpart. Both share identical pinouts (SOIC-20), including dual OE inputs (pins 9, 10) and flow-through layout (inputs 1–8, outputs 11–18). The only functional difference is logical polarity: MC74AC541MELG outputs replicate input states (Yn = Dn), whereas MC74AC540MELG outputs invert them (Yn = Dn̅), as defined in the Truth Table on page 1.
Is MC74AC541MELG pin-compatible with 74LS244?
No, MC74AC541MELG is not pin-compatible with 74LS244. While both are octal noninverting buffers in SOIC-20 packages, their pin assignments differ: 74LS244 uses OE1/OE2 on pins 1 and 19, whereas MC74AC541MELG places OE1/OE2 on pins 9 and 10. Additionally, MC74AC541MELG has flow-through architecture (inputs 1–8, outputs 11–18), unlike 74LS244's mirrored layout. Board redesign is required for replacement.
What does the "MELG" suffix indicate in MC74AC541MELG?
The "MELG" suffix identifies the specific packaging and compliance variant: "ME" denotes the SOIC-20 wide-body (Case 751D) package, "L" indicates tape-and-reel shipping (1000 units per reel), and "G" certifies Pb-free/RoHS-compliant construction. This matches the ordering information on page 8 of the datasheet, where MC74AC541DWR2G corresponds to the same configuration - confirming MELG is a valid onsemi marking variant for this part.
MC74AC541MELG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74AC
- 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 ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOEIAJ-20
MC74AC541MELG FAQ
1.How can I place an order for MC74AC541MELG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74AC541MELG 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 MC74AC541MELG reliable?
The price and inventory of MC74AC541MELG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74AC541MELG is usually 5 days.
3.What payment methods are accepted for MC74AC541MELG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74AC541MELG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74AC541MELG?
MC74AC541MELG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74AC541MELG 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 MC74AC541MELG?
For technical support, including MC74AC541MELG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74AC541MELG requirements.
6.How does Aetrix verify that MC74AC541MELG is sourced from the original manufacturer or authorized distributors?
All MC74AC541MELG 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 MC74AC541MELG meets industry standards.
7.What is the process for return or replacement of MC74AC541MELG?
All MC74AC541MELG units undergo pre-shipment inspection (PSI). If there is an issue with MC74AC541MELG, 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 MC74AC541MELG part is unused and in its original packaging.
Return procedure for MC74AC541MELG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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