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onsemi 74ACTQ541SCX
- Part No.:
- 74ACTQ541SCX
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ACTQ541SCX.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,280
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Product details
Overview
74ACTQ541SCX from Fairchild Semiconductor 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 features flow-through pinout (inputs on one side, outputs on the other), ±24 mA drive capability, guaranteed 4 kV ESD immunity, and FACT Quiet Series™ technology for low simultaneous switching noise.
For engineers reviewing the 74ACTQ541SCX datasheet, pinout, applications, or equivalent options, key selection criteria include 3-STATE enable timing (tPZH/tPLZ ≤ 9.5 ns), quiet-output dynamic VOLP/VOLV (±1.2 V), TTL-compatible inputs, and SOIC-20 package compatibility with JEDEC MS-013 footprint.
Technical Context
The 74ACTQ541SCX implements a flow-through architecture with eight independent non-inverting buffers, each controlled by dual active-low 3-STATE enables (OE1, OE2). Its FACT Quiet Series™ design integrates GTO™ output control and undershoot correction to suppress ground bounce and improve dynamic threshold stability during high-speed switching.
It operates across 4.5 V to 5.5 V supply, supports −40°C to +85°C industrial temperature range, and guarantees pin-to-pin skew ≤1.0 ns between any two outputs under identical switching conditions. Input thresholds are TTL-compatible (VIH = 2.0 V min, VIL = 0.8 V max), and output voltage levels meet VOH ≥ 4.4 V / VOL ≤ 0.44 V at ±24 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures robust operation across standard 5 V rail tolerances in industrial and computing systems. |
| Output Drive | ±24 mA - Supports direct interface to 50 Ω transmission lines or multiple TTL loads without external buffering. |
| Propagation Delay | tPLH/tPHL ≤ 7.5 ns @ CL = 50 pF - Enables reliable timing in high-speed address/data buses up to ~100 MHz. |
| 3-STATE Enable Time | tPZH/tPZL ≤ 9.5 ns - Minimizes bus contention windows during multiplexed I/O transitions. |
| ESD Immunity | ≥4 kV HBM - Provides built-in protection against handling-induced electrostatic discharge in assembly environments. |
| Dynamic Noise Margin | VOLP = +1.5 V, VOLV = −1.2 V @ VCC = 5.0 V - Quantifies worst-case quiet-output voltage excursion during simultaneous switching events. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Ensures interoperability with legacy TTL and CMOS logic families without level shifting. |
Pinout & Package
74ACTQ541SCX is packaged in a 20-lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013 compliant, 0.300-inch body width, surface-mountable with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | I0–I7 Inputs | Non-inverting data inputs; TTL-compatible, accept 0 V to VCC logic levels. |
| 9, 19 | OE1, OE2 | Active-low 3-STATE enable controls; both must be LOW to enable all eight outputs. |
| 11, 12, 13, 14, 15, 16, 17, 18 | O0–O7 Outputs | Non-inverting buffered outputs; enter high-impedance state when either OE1 or OE2 is HIGH. |
| 10 | GND | Signal ground reference for all I/O and internal circuitry. |
| 20 | VCC | Positive supply terminal; requires local 0.1 µF decoupling to minimize switching noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Inputs (pins 1–8) and outputs (pins 11–18) on opposite sides - simplifies PCB routing and improves signal integrity in dense bus layouts. |
| FACT Quiet Series™ | Integrated GTO™ control and undershoot correction - reduces simultaneous switching output noise by >50% versus standard ACT devices. |
| Guaranteed AC performance | Pin-to-pin skew ≤1.0 ns - ensures deterministic timing alignment across all eight outputs in synchronous bus applications. |
| Low ICC and IOZ | ICC ≤ 40 µA, IOZ ≤ ±2.5 µA - minimizes standby power and leakage current in battery-backed or low-power hold modes. |
| TTL-compatible inputs | VIH/VIL thresholds match standard TTL - eliminates need for input level translators when interfacing with legacy controllers. |
Applications
| Memory Address Buffering | Microprocessor Output Port |
|---|---|
|
Use Scenario: Driving 16-bit address bus from a Z80 or 8086 CPU to multiple SRAM chips. IC Role / Device Role / Timing Role: Non-inverting octal buffer with 3-STATE control, enabling shared address bus arbitration between CPU and DMA controller. Use Value: Flow-through layout minimizes trace length mismatch; guaranteed 7.5 ns propagation delay ensures setup/hold compliance at 8 MHz bus clock. |
Use Scenario: Expanding GPIO capability of an 8-bit microcontroller for LED matrix scanning and keypad polling. IC Role / Device Role / Timing Role: Output port driver with dual OE control, allowing software-selectable bank enable for peripheral isolation. Use Value: ±24 mA per output drives LEDs directly; 4 kV ESD rating protects against field-deployed touch interface surges. |
| Industrial Bus Transceiver Interface | Clock Distribution Network |
|
Use Scenario: Isolating and strengthening RS-422/RS-485 transceiver control signals in PLC backplane designs. IC Role / Device Role / Timing Role: Bidirectional bus driver with 3-STATE outputs, used for direction-control and enable-signal conditioning. Use Value: Low tPZH/tPLZ (≤9.5 ns) prevents metastability in half-duplex enable sequencing; quiet switching reduces EMI near analog sensor circuits. |
Use Scenario: Distributing a 25 MHz system clock to four FPGA configuration banks with matched skew. IC Role / Device Role / Timing Role: Clock fanout buffer with synchronized edge delivery across all eight outputs. Use Value: Guaranteed 1.0 ns max output-to-output skew maintains <100 ps clock skew budget across distributed loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74ACT244SCX | No FACT Quiet Series™; higher simultaneous switching noise (VOLP up to +2.0 V); no guaranteed skew spec. | Lacks undershoot correction and GTO™ control - less suitable for noise-sensitive mixed-signal boards. | Choose when cost is primary constraint and board-level noise filtering is already implemented. |
| SN74ACT541DWR | TSSOP-20 package (4.4 mm width); identical AC/DC specs but different thermal resistance and mounting profile. | Requires PCB redesign for TSSOP footprint; better thermal performance in high-density layouts. | Choose when space-constrained PCBs demand smaller footprint and improved heat dissipation. |
Compared with 74ACTQ541SCX, the 74ACT244SCX offers lower cost but sacrifices noise control and skew guarantees, while the SN74ACT541DWR provides identical functionality in a smaller TSSOP package-enabling higher board density at the expense of rework for SOIC-to-TSSOP transition.
Availability
74ACTQ541SCX is available at Aetrix Electronics and suitable for memory subsystems, microprocessor I/O expansion, industrial bus interfaces, and clock distribution networks requiring stable component supply and long-term industrial temperature support.
Supply support for 74ACTQ541SCX 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
Fairchild Semiconductor was a U.S.-based semiconductor manufacturer specializing in analog, logic, and power ICs before its acquisition by ON Semiconductor in 2016; its legacy logic families remain widely deployed in industrial and computing infrastructure.
The 74ACTQ541 belongs to the ACT Quiet Series™ family, engineered specifically for high-noise-immunity digital interfacing in mixed-signal systems where ground bounce and dynamic threshold instability compromise reliability.
FAQ
What is the operating temperature range for the 74ACTQ541SCX?
The 74ACTQ541SCX is rated for industrial operation from −40°C to +85°C. This range is validated across all DC and AC specifications in the datasheet, including propagation delay, output drive, and 3-STATE timing parameters. The SOIC package's thermal characteristics support sustained operation within this envelope under typical PCB copper pour and airflow conditions.
Does the 74ACTQ541SCX require external pull-up or pull-down resistors on its inputs?
No, the 74ACTQ541SCX does not require external pull-up or pull-down resistors on its inputs. Its TTL-compatible input structure has defined VIH (≥2.0 V) and VIL (≤0.8 V) thresholds with low input leakage (±1.0 µA max), allowing direct connection to CMOS or TTL outputs. Floating inputs are not recommended due to potential noise susceptibility, but intentional termination is unnecessary.
How does the dual OE control (OE1 and OE2) function in the 74ACTQ541SCX?
In the 74ACTQ541SCX, both OE1 and OE2 must be held LOW to enable all eight outputs. If either OE1 or OE2 is HIGH, all outputs enter high-impedance state. This dual-enable architecture allows flexible bus arbitration-e.g., OE1 tied to CPU control and OE2 to DMA controller-ensuring only one driver is active on a shared bus at any time.
Can the 74ACTQ541SCX drive a 50 Ω transmission line directly?
Yes, the 74ACTQ541SCX can drive a 50 Ω transmission line directly. Its ±24 mA output drive capability meets the current requirement for a 5 V signal into 50 Ω (100 mA peak), and its controlled edge rates (125 mV/ns min input slew) help limit reflections. For optimal signal integrity, use series termination at the source and maintain proper impedance-controlled routing.
Is the 74ACTQ541SCX pin-compatible with the 74ACT541?
No, the 74ACTQ541SCX is not pin-compatible with the standard 74ACT541. While both are octal non-inverting buffers with 3-STATE outputs, the 74ACTQ541SCX uses a flow-through pinout (inputs on left, outputs on right), whereas the 74ACT541 follows traditional input/output interleaving. The 74ACTQ541SCX pin mapping matches the 74ACTQ244, not the 74ACT541.
74ACTQ541SCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACTQ
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
74ACTQ541SCX FAQ
1.How can I place an order for 74ACTQ541SCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACTQ541SCX 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 74ACTQ541SCX reliable?
The price and inventory of 74ACTQ541SCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACTQ541SCX is usually 5 days.
3.What payment methods are accepted for 74ACTQ541SCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACTQ541SCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACTQ541SCX?
74ACTQ541SCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACTQ541SCX 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 74ACTQ541SCX?
For technical support, including 74ACTQ541SCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACTQ541SCX requirements.
6.How does Aetrix verify that 74ACTQ541SCX is sourced from the original manufacturer or authorized distributors?
All 74ACTQ541SCX 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 74ACTQ541SCX meets industry standards.
7.What is the process for return or replacement of 74ACTQ541SCX?
All 74ACTQ541SCX units undergo pre-shipment inspection (PSI). If there is an issue with 74ACTQ541SCX, 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 74ACTQ541SCX part is unused and in its original packaging.
Return procedure for 74ACTQ541SCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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