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onsemi 74AC541MTCX
- Part No.:
- 74AC541MTCX
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AC541MTCX.pdf
- Description:
- IC BUFF NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,454
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Product details
Overview
74AC541MTCX from onsemi is an octal non-inverting 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, features flow-through pinout (inputs on one side, outputs on the other), and supports industrial temperature range (−40°C to +85°C).
For engineers reviewing the 74AC541MTCX datasheet, pinout, applications, or equivalent options, this device is selected for high-density PCB layout in bus-transceiver roles where low ICC (40 µA max), fast propagation delay (1.5 ns min @ 5 V), and TTL-compatible voltage thresholds are required.
Technical Context
The 74AC541MTCX implements eight independent non-inverting buffers, each controlled by dual 3-state enable inputs (OE1 and OE2). Its flow-through architecture places all eight inputs on pins 1–8 and outputs on pins 13–20, enabling direct trace routing between microprocessor data/address buses and peripheral loads without layer crossover.
It uses AC CMOS logic with rail-to-rail output swing, supports mixed-voltage system interfacing via its wide VCC range (2.0–6.0 V), and meets JEDEC-standard timing parameters including tPLH/tPHL ≤ 6.5 ns (max @ 5 V, CL = 50 pF) and output enable/disable times under 12.5 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0 V to 6.0 V - enables interoperability across 3.3 V and 5 V systems without level shifters. |
| Output Drive | ±24 mA - sufficient to directly drive 50 Ω transmission lines or multiple TTL loads. |
| Propagation Delay | 1.5 ns (min) to 6.5 ns (max) @ 5 V - ensures sub-150 MHz bus operation with timing margin. |
| 3-State Leakage | ±2.5 µA max - minimizes standby current in high-impedance bus segments. |
| Input Thresholds | VIH = 2.1 V, VIL = 0.9 V @ 3.0 V VCC - compatible with LVTTL and 3.3 V CMOS logic families. |
| Quiescent ICC | 40 µA max @ 5.5 V - reduces static power in always-on control-path applications. |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded and automation equipment. |
Pinout & Package
TSSOP-20 package (JEDEC MO-153 compliant), 4.4 mm × 6.5 mm body, 0.65 mm pitch, Pb-free, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8 | Data Inputs (I1–I8) | CMOS-compatible digital inputs accepting 0–VCC logic levels; no internal pull-ups/downs. |
| 9, 10 | Output Enable (OE1, OE2) | Active-low enables; both must be LOW for outputs to drive; HIGH places all outputs in high-Z. |
| 11, 12 | GND, VCC | Power supply reference pins; decoupling capacitor placement adjacent to Pin 11/12 is critical for noise immunity. |
| 13–20 | Data Outputs (Y1–Y8) | Non-inverting buffered outputs with 3-state capability; capable of sourcing/sinking 24 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs (1–8) and outputs (13–20) on opposite sides - eliminates PCB layer jumps and reduces trace crosstalk in dense bus layouts. |
| Low ICC and IOZ | ICC ≤ 40 µA and IOZ ≤ ±2.5 µA - cuts standby power in battery-backed or energy-sensitive systems by >50% vs legacy TTL. |
| High-output drive | ±24 mA per output - drives 15+ TTL loads or terminates unterminated stubs in point-to-point bus topologies. |
| Pb-free packaging | RoHS-compliant TSSOP-20 with G-marking - meets global environmental compliance without derating or thermal penalty. |
| Wide VCC tolerance | 2.0–6.0 V operation - supports single-supply designs across 2.5 V, 3.3 V, and 5 V domains without external regulators. |
Applications
| Memory Address Buffering | Microprocessor Output Port |
|---|---|
|
Use Scenario: Buffering 8-bit address lines from an 8051 or Z80 microcontroller to SRAM or EPROM chips. IC Role / Device Role / Timing Role: Non-inverting address driver with 3-state control synchronized to WR/RD strobes. Use Value: Prevents address bus contention during DMA cycles and maintains signal integrity over 10 cm traces at 10 MHz. |
Use Scenario: Expanding GPIO capability of an ARM Cortex-M0+ MCU to drive LED arrays and relays. IC Role / Device Role / Timing Role: Parallel I/O port extender with cycle-synchronized output enable for glitch-free state transitions. Use Value: Eliminates need for discrete transistors or MOSFETs while supporting 24 mA per channel at full VCC. |
| Industrial Bus Transceiver | Legacy System Interface |
|
Use Scenario: Interfacing a modern FPGA-based controller to legacy RS-485 or CAN transceiver address/data latches. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer between 3.3 V logic and 5 V bus peripherals. Use Value: Maintains setup/hold timing margins despite VCC mismatch due to <6.5 ns propagation delay and rail-to-rail swing. |
Use Scenario: Replacing obsolete 74LS244 in repair of vintage test equipment requiring 5 V TTL compatibility. IC Role / Device Role / Timing Role: Drop-in functional replacement with identical pinout and improved speed/power profile. Use Value: Reduces board-level heat by 70% and extends mean time between failures in air-cooled chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74AC541SCX | Same AC logic family and electrical specs, but SOIC-20 package (12.8 mm × 7.5 mm vs TSSOP's 6.5 mm × 4.4 mm). | Preferred for through-hole prototyping or legacy PCB rework where footprint change is unacceptable. | Select when mechanical compatibility with existing SOIC footprints is mandatory and board space is not constrained. |
| 74ACT541MTCX | TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V @ 5 V) vs AC's CMOS thresholds (VIL = 0.9 V, VIH = 2.1 V); otherwise identical timing and drive. | Better suited for mixed-logic systems with legacy TTL sources or noisy industrial environments requiring higher noise margin. | Select when driving from 74LS or 74F series logic or operating in EMI-prone factory-floor settings. |
Compared with 74AC541SCX and 74ACT541MTCX, the 74AC541MTCX offers the smallest footprint and lowest static power, making it optimal for space-constrained, battery-aware, or thermally sensitive industrial controllers - while retaining full functional equivalence to the 74AC541 family.
Availability
74AC541MTCX is available at Aetrix Electronics and suitable for industrial automation, embedded instrumentation, and legacy system upgrades requiring stable component supply, RoHS compliance, and long-term lifecycle support.
Supply support for 74AC541MTCX 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 power, analog, sensor, and logic solutions for automotive, industrial, and cloud infrastructure markets.
The 74AC541MTCX belongs to onsemi's legacy AC logic product line, engineered for high-speed, low-power bus interface applications in industrial control, test equipment, and computing peripherals.
FAQ
What is the maximum operating frequency supported by the 74AC541MTCX?
The 74AC541MTCX does not specify a maximum clock frequency, but its AC electrical characteristics support reliable operation up to approximately 150 MHz in bus applications. This is derived from its worst-case propagation delay of 6.5 ns (tPLH/tPHL @ 5 V, CL = 50 pF), allowing for ≥150 MHz data rate with adequate setup/hold margin. The 74AC541MTCX is not a clocked device but functions as a combinatorial buffer, so frequency limits depend on system-level timing analysis.
Does the 74AC541MTCX require external pull-up or pull-down resistors on its inputs or outputs?
No, the 74AC541MTCX does not require external pull-up or pull-down resistors. Its CMOS inputs have negligible leakage (±1.0 µA max), and outputs are actively driven in both HIGH and LOW states with no open-drain configuration. Pull resistors are only needed if system-level bus arbitration or fail-safe idle-state definition is required - not for basic 74AC541MTCX functionality.
Can the 74AC541MTCX operate at 3.3 V supply voltage?
Yes, the 74AC541MTCX is fully specified for 3.3 V operation. Its recommended VCC range includes 3.0 V to 3.6 V, with guaranteed VIH = 2.1 V and VIL = 0.9 V at 3.0 V, and VOH/VOL performance validated at 3.3 V. Propagation delay is 1.5–9.0 ns (min/max) at 3.3 V, making the 74AC541MTCX suitable for mixed-voltage 3.3 V/5 V system interfaces.
What is the meaning of "flow-through architecture" in the context of the 74AC541MTCX?
Flow-through architecture means the 74AC541MTCX places all eight inputs (pins 1–8) on one side of the TSSOP-20 package and all eight outputs (pins 13–20) on the opposite side. This allows straight-line PCB routing from microprocessor buses to peripheral devices without vias or layer changes, improving signal integrity and reducing layout complexity - a key advantage over traditional in-line pinouts like those in the 74AC244.
Is the 74AC541MTCX pin-compatible with the 74AC244?
No, the 74AC541MTCX is not pin-compatible with the 74AC244. While both are octal buffers with 3-state outputs, the 74AC541MTCX uses a flow-through pinout (inputs on left, outputs on right), whereas the 74AC244 has inputs and outputs interleaved. Their pin assignments differ completely - for example, 74AC541MTCX Input 1 is on Pin 1, but 74AC244 Input 1 is on Pin 10. Direct substitution requires PCB redesign.
74AC541MTCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74AC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 20-TSSOP
74AC541MTCX FAQ
1.How can I place an order for 74AC541MTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC541MTCX 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 74AC541MTCX reliable?
The price and inventory of 74AC541MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC541MTCX is usually 5 days.
3.What payment methods are accepted for 74AC541MTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC541MTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC541MTCX?
74AC541MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC541MTCX 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 74AC541MTCX?
For technical support, including 74AC541MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC541MTCX requirements.
6.How does Aetrix verify that 74AC541MTCX is sourced from the original manufacturer or authorized distributors?
All 74AC541MTCX 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 74AC541MTCX meets industry standards.
7.What is the process for return or replacement of 74AC541MTCX?
All 74AC541MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74AC541MTCX, 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 74AC541MTCX part is unused and in its original packaging.
Return procedure for 74AC541MTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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