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onsemi 74ACT541MTC
- Part No.:
- 74ACT541MTC
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ACT541MTC.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,138
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Product details
Overview
74ACT541MTC from onsemi is an octal non-inverting buffer/line driver with 3-state outputs, designed for memory and address bus driving, clock distribution, and microprocessor output port interfacing. It operates at 4.5 V to 5.5 V, delivers ±24 mA output drive, features TTL-compatible inputs, and uses flow-through pinout (inputs on one side, outputs on the other) in a TSSOP-20 package.
For engineers reviewing the 74ACT541MTC datasheet, pinout, applications, or equivalent options, this device is selected for high-density PCB layouts requiring bidirectional bus control, low ICC quiescent current (≤40 µA), fast propagation delay (tPLH/tPHL ≤ 7.5 ns at 5 V), and robust 3-state output isolation in industrial and embedded computing systems.
Technical Context
The 74ACT541MTC implements eight independent non-inverting buffers, each with separate 3-state enable control via dual active-low OE pins (OE1 and OE2). Its TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V at VCC = 5.5 V) ensure direct interfacing with legacy 5 V logic families without level shifting.
It employs CMOS technology with bipolar-compatible input structure, achieving AC performance comparable to 74ACT244 but with optimized pin arrangement for microprocessor data/address port expansion - inputs on pins 1–8 and 19–20, outputs on pins 11–18, enabling straight trace routing and minimizing layer transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS systems; supports stable operation across full industrial temperature range. |
| Output Drive | ±24 mA per output - sufficient to drive 50 Ω transmission lines or multiple 74-series loads without external buffering. |
| Propagation Delay | ≤7.5 ns (tPLH/tPHL, VCC = 5 V, CL = 50 pF) - enables reliable operation in 100+ MHz bus timing windows. |
| 3-State Enable/Disable | tPZH ≤ 9.5 ns, tPHZ ≤ 8.0 ns - ensures minimal bus contention during direction switching in shared-data applications. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V (VCC = 5.5 V) - guarantees noise-immune recognition of TTL-level signals without external biasing. |
| Quiescent Current | ICC ≤ 40 µA - reduces static power in always-on control logic and battery-backed subsystems. |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial-grade embedded controllers, instrumentation, and communications equipment. |
Pinout & Package
TSSOP-20 package (JEDEC MO-153 compliant), 4.4 mm × 6.5 mm body, 0.65 mm pitch, lead-free (Pb-free) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data Inputs (I1–I8) | Active-high logic inputs accepting TTL-compatible voltage levels; directly driven by microprocessor data/address bus lines. |
| 9, 10 | Output Enable (OE1, OE2) | Active-low enables for two groups of four outputs; allows independent control of output subsets for partial bus gating. |
| 11, 12, 13, 14, 15, 16, 17, 18 | Data Outputs (Y1–Y8) | 3-state buffered outputs capable of sourcing/sinking ±24 mA; high-impedance state isolates bus when disabled. |
| 19, 20 | VCC, GND | Single power supply rail and ground reference; decoupling capacitor placement adjacent to these pins minimizes switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs on left side (pins 1–8, 19–20), outputs on right side (pins 11–18) - eliminates crossing traces and improves signal integrity in dense microprocessor interface layouts. |
| TTL-compatible inputs | VIH = 2.0 V, VIL = 0.8 V at 5.5 V - enables direct connection to legacy 5 V microcontrollers and peripheral ICs without level translators. |
| Low ICC and IOZ | ICC ≤ 40 µA, IOZ ≤ ±2.5 µA - reduces system standby power and prevents leakage-induced bus float in powered-down subsystems. |
| High-output drive | ±24 mA per output - drives terminated lines or fan-out >10 to standard 74ACT loads, eliminating need for additional drivers in bus repeater designs. |
| Pb-free packaging | TSSOP-20 with RoHS-compliant finish - meets global environmental compliance requirements for industrial and consumer electronics manufacturing. |
Applications
| Microprocessor Address Bus Driver | Industrial PLC I/O Expansion Module |
|---|---|
|
Use Scenario: Driving 16-bit address lines from an 8051 or similar microcontroller to external SRAM or flash memory. IC Role / Device Role / Timing Role: Non-inverting buffer with 3-state control synchronizing address latching and memory selection. Use Value: Flow-through pinout simplifies parallel trace routing; ±24 mA drive ensures clean edges across 10 cm PCB traces at 10 MHz. |
Use Scenario: Isolating and amplifying digital I/O signals between a PLC CPU backplane and field-mounted sensor/actuator modules. IC Role / Device Role / Timing Role: Bidirectional bus transceiver section (with complementary 74ACT245) managing discrete input scanning and output update cycles. Use Value: Dual OE pins allow staggered enable sequencing to prevent simultaneous switching noise across 8-channel output banks. |
| Legacy System Clock Distribution | Test Equipment Digital Pattern Generator |
|
Use Scenario: Distributing a 25 MHz system clock to multiple synchronous peripherals (ADCs, DACs, FPGAs) in a test bench controller. IC Role / Device Role / Timing Role: Low-skew clock buffer with 3-state capability enabling dynamic clock gating during idle states. Use Value: Propagation delay ≤7.5 ns and <1 ns skew between outputs maintain setup/hold margins for 40 MHz sampling clocks. |
Use Scenario: Generating synchronized 8-bit parallel stimulus patterns for DUT testing in automated test equipment (ATE). IC Role / Device Role / Timing Role: Output port latch driver translating FPGA GPIO states into robust, terminated bus signals. Use Value: High-current drive (±24 mA) sustains logic levels under 50 Ω coaxial cable loading; TSSOP-20 footprint supports compact channel density. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT244SCX | Octal buffer with identical 3-state architecture and TTL-compatible inputs, but dual 4-bit groups with shared OE per group (vs. independent OE1/OE2 on 74ACT541MTC). | Lacks per-group enable flexibility; better suited for symmetric bus drivers than asymmetric port expansion. | Select 74ACT244SCX when matching legacy 244-based designs or when simplified enable logic suffices. |
| SN74ACT541PW | Pin-compatible TSSOP-20 variant from Texas Instruments; identical logic function, VIH/VIL, and drive strength, but slightly higher max tPLH (8.5 ns vs. 7.5 ns). | Same PCB footprint and interconnect; minor timing margin reduction acceptable in non-critical paths. | Choose SN74ACT541PW for multi-source procurement where TI's supply chain or qualification profile is preferred. |
Compared with 74ACT541MTC, 74ACT244SCX offers simpler enable control but less granular output grouping, while SN74ACT541PW provides identical functionality with marginally relaxed timing - both serve as functional alternatives where layout reuse or second-source assurance is prioritized over sub-nanosecond skew optimization.
Availability
74ACT541MTC is available at Aetrix Electronics and suitable for industrial PLCs, test equipment digital I/O subsystems, and legacy microprocessor memory expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 74ACT541MTC 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 management, analog, logic, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The 74ACT541MTC belongs to onsemi's advanced CMOS logic family, engineered for interoperability with TTL systems and optimized for high-density, low-power digital interface applications in industrial control and embedded computing.
FAQ
What is the maximum operating supply voltage for the 74ACT541MTC?
The 74ACT541MTC has an absolute maximum supply voltage (VCC) rating of +6.5 V, but its recommended operating range is 4.5 V to 5.5 V. Operation above 5.5 V may cause excessive power dissipation or reliability degradation, and is not guaranteed per datasheet specifications. For stable 5 V system integration, 74ACT541MTC should be operated within 4.5–5.5 V.
Does the 74ACT541MTC support hot-swap or live-insertion?
No, the 74ACT541MTC does not include built-in hot-swap protection features such as power-up sequencing control, slew-rate limiting, or undervoltage lockout. Its absolute maximum ratings specify strict limits on input/output voltage relative to VCC and GND, and violating these during insertion (e.g., applying signals before VCC stabilizes) risks latch-up or permanent damage. Proper power sequencing must be implemented externally when using 74ACT541MTC in modular backplane systems.
Can the 74ACT541MTC drive a 50 Ω transmission line directly?
Yes, the 74ACT541MTC can drive a 50 Ω transmission line directly: its ±24 mA output drive capability supports a nominal 5 V logic swing into 50 Ω (resulting in ~2.5 V drop under load), and its output impedance (when sourcing/sinking) is sufficiently low to minimize reflections. For optimal signal integrity beyond 10 cm, series termination at the source or controlled-impedance PCB routing is still recommended alongside proper 74ACT541MTC decoupling.
What is the purpose of the dual OE pins (OE1 and OE2) on the 74ACT541MTC?
The dual active-low output enable pins (OE1 and OE2) independently control two groups of four outputs each (Y1–Y4 and Y5–Y8), allowing selective 3-state activation. This enables partial bus isolation - for example, holding half the data bus in high-Z while updating the other half - reducing simultaneous switching noise and supporting flexible memory-mapped I/O partitioning in microprocessor systems using the 74ACT541MTC.
Is the 74ACT541MTC pin-compatible with the 74AC541MTC?
Yes, the 74ACT541MTC and 74AC541MTC share identical pinout, package (TSSOP-20), and logic function, differing only in input threshold compatibility: 74ACT541MTC accepts TTL-level inputs (VIH = 2.0 V), while 74AC541MTC requires CMOS-level inputs (VIH = 3.85 V at 5.5 V). Thus, 74ACT541MTC can replace 74AC541MTC in systems with mixed-signal or legacy TTL sources, but not vice versa without level translation.
74ACT541MTC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74ACT541MTC FAQ
1.How can I place an order for 74ACT541MTC through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT541MTC 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 74ACT541MTC reliable?
The price and inventory of 74ACT541MTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT541MTC is usually 5 days.
3.What payment methods are accepted for 74ACT541MTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT541MTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT541MTC?
74ACT541MTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT541MTC 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 74ACT541MTC?
For technical support, including 74ACT541MTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT541MTC requirements.
6.How does Aetrix verify that 74ACT541MTC is sourced from the original manufacturer or authorized distributors?
All 74ACT541MTC 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 74ACT541MTC meets industry standards.
7.What is the process for return or replacement of 74ACT541MTC?
All 74ACT541MTC units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT541MTC, 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 74ACT541MTC part is unused and in its original packaging.
Return procedure for 74ACT541MTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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