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onsemi 74ACTQ541MTCX
- Part No.:
- 74ACTQ541MTCX
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ACTQ541MTCX.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,785
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Product details
Overview
74ACTQ541MTCX 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 operates over 4.5 V to 5.5 V supply at −40°C to +85°C.
For engineers reviewing the 74ACTQ541MTCX datasheet, pinout, applications, or equivalent options, key selection criteria include simultaneous switching noise performance, output skew control, TTL-compatible inputs, quiet-output dynamic thresholds, and TSSOP-20 package compatibility with high-density PCB layouts.
Technical Context
The 74ACTQ541MTCX implements FACT Quiet Series™ technology with GTO™ output control and undershoot correction, using a split ground bus architecture to suppress simultaneous switching noise. Its flow-through layout separates I0–I7 and O0–O7 on opposite package edges, enabling direct microprocessor bus routing without layer crossover.
It guarantees pin-to-pin AC skew ≤1.0 ns (tOSHL/tOSLH), propagation delays of 2.0–7.5 ns (tPLH/tPHL), and output enable/disable times of 2.0–9.5 ns (tPZH/tPLZ). All timing parameters are specified at CL = 50 pF and VCC = 5.0 V ± 0.5 V across full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL/CMOS systems while tolerating rail variation in industrial power supplies. |
| Output Drive | ±24 mA - supports direct connection to 50 Ω transmission lines or multiple TTL loads without external buffering. |
| Propagation Delay | 2.0–7.5 ns - enables reliable operation in high-speed address/data buses up to ~100 MHz system clock domains. |
| 3-STATE Leakage | ±2.5 µA max - minimizes bus contention current and signal integrity degradation during high-impedance state. |
| ESD Immunity | ≥4 kV HBM - provides robust handling margin during board assembly and field service without additional protection circuitry. |
| Dynamic Thresholds | VILD = 0.8 V, VIHD = 2.2 V - defines noise-immune input switching windows under simultaneous switching conditions. |
| Quiet Output Noise | VOLP = 1.5 V, VOLV = −1.2 V - quantifies worst-case undershoot/overshoot on inactive outputs during adjacent switching events. |
Pinout & Package
74ACTQ541MTCX is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4 mm wide, with gull-wing leads and exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | I0–I7 Inputs | TTL-compatible digital inputs accepting 0 V / 3–5 V logic levels; internally terminated to reduce floating node risk. |
| 9, 19 | OE1, OE2 | Active-LOW 3-STATE enable controls - both must be LOW to activate all eight outputs; independent control not supported. |
| 11, 12, 13, 14, 15, 16, 17, 18 | O0–O7 Outputs | Non-inverting buffered outputs with ±24 mA sink/source; enter high-impedance state when OE1/OE2 HIGH. |
| 10, 20 | GND, VCC | Dedicated power/ground pins placed at corners to minimize ground bounce and improve decoupling effectiveness. |
Key Features
| Feature | Design Value |
|---|---|
| FACT Quiet Series™ Architecture | Integrates GTO™ output control and undershoot correction to limit simultaneous switching noise to <1.5 V peak undershoot (VOLV) and <1.5 V overshoot (VOLP). |
| Flow-Through Pinout | Inputs (pins 1–8) and outputs (pins 11–18) positioned on opposite sides - eliminates trace crossovers and reduces PCB layer count in microprocessor interface designs. |
| Guaranteed Pin-to-Pin Skew | ≤1.0 ns maximum skew between any two outputs - ensures deterministic timing alignment in parallel bus applications such as address latching. |
| TTL-Compatible Inputs | VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V - allows direct interfacing with legacy 5 V TTL logic without level-shifting circuitry. |
| Low ICC and IOZ | Quiescent ICC ≤ 40 µA, 3-STATE leakage IOZ ≤ ±2.5 µA - reduces standby power and prevents false triggering on shared buses. |
Applications
| Microprocessor Bus Interface | Memory Address Driver |
|---|---|
|
Use Scenario: Driving 8-bit bidirectional data or address bus from an 8051 or Z80 microprocessor with tight layout constraints. IC Role / Device Role / Timing Role: Non-inverting 3-STATE buffer providing direction-controlled output port expansion with flow-through routing. Use Value: Eliminates need for PCB layer transitions by aligning inputs and outputs on opposite edges, reducing trace length and crosstalk in compact embedded boards. |
Use Scenario: Buffering 8-bit segment of a 16-bit memory address bus for SRAM or EPROM access. IC Role / Device Role / Timing Role: High-drive line driver ensuring clean signal edge integrity across long traces or multiple load capacitances. Use Value: ±24 mA drive strength maintains VIH/VIL margins at 50 pF load and 7.5 ns max tPHL, preventing setup/hold violations in asynchronous memory cycles. |
| Clock Distribution Network | Industrial Control Backplane |
|
Use Scenario: Distributing a system clock signal to multiple peripheral ICs requiring synchronized enable timing. IC Role / Device Role / Timing Role: Low-skew fanout buffer with matched propagation delay across all eight outputs. Use Value: Guaranteed ≤1.0 ns output-to-output skew ensures sub-cycle timing alignment critical for synchronous peripherals like ADCs or DACs. |
Use Scenario: Interfacing PLC I/O modules to a central controller via a shared 8-bit status/control backplane. IC Role / Device Role / Timing Role: Robust 3-STATE bus transceiver supporting hot-swap and fault-isolation modes. Use Value: 4 kV HBM ESD rating and −40°C to +85°C operating range ensure reliability in electrically noisy factory environments without external protection. |
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 |
|---|---|---|---|
| 74ACT244MTCX | Lacks FACT Quiet Series™ noise suppression; no guaranteed skew spec; higher simultaneous switching noise (VOLP up to 2.2 V). | Suitable for lower-noise, non-critical bus segments where layout isolation is feasible. | Select when cost sensitivity outweighs strict noise control requirements and skew tolerance >2 ns is acceptable. |
| SN74LVC8T245RHLR | 3.3 V only (1.65–3.6 V); dual-supply I/O; level-shifting capability; no 5 V tolerance on A-side inputs. | Required for mixed-voltage systems interfacing 3.3 V controllers to 5 V peripherals via translation. | Choose only if voltage translation is needed; not drop-in compatible due to supply and logic-level mismatch with 74ACTQ541MTCX. |
Compared with 74ACTQ541MTCX, the 74ACT244MTCX offers identical pinout but lacks guaranteed skew and quiet-output features, while SN74LVC8T245RHLR enables voltage translation at the cost of 5 V incompatibility-neither is pin- or functionally interchangeable without redesign.
Availability
74ACTQ541MTCX is available at Aetrix Electronics and suitable for microprocessor bus interfaces, memory address drivers, clock distribution networks, and industrial control backplanes requiring stable component supply and long-term obsolescence management.
Supply support for 74ACTQ541MTCX 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 company specializing in analog, discrete, and logic ICs before its acquisition by ON Semiconductor in 2016; its legacy logic families remain widely deployed in industrial and legacy systems.
The 74ACTQ541MTCX belongs to the ACTQ Quiet Series™ family, engineered specifically for high-density digital systems where simultaneous switching noise, timing skew, and PCB layout efficiency are critical design constraints.
FAQ
What is the recommended operating voltage range for the 74ACTQ541MTCX?
The 74ACTQ541MTCX is specified to operate reliably from 4.5 V to 5.5 V. Operation outside this range may compromise timing accuracy, noise immunity, or output drive strength. The device's DC electrical characteristics-including VOH, VOL, and VIH/VIL-are fully guaranteed only within this window, and exceeding 5.5 V risks permanent damage per absolute maximum ratings.
Does the 74ACTQ541MTCX support independent 3-STATE control of individual outputs?
No, the 74ACTQ541MTCX does not support per-output enable control. It uses two shared active-LOW enable inputs (OE1 and OE2) that must both be driven LOW to activate all eight outputs. When either OE1 or OE2 is HIGH, all outputs enter high-impedance state-this architecture simplifies bus arbitration but prevents selective channel gating.
Is the 74ACTQ541MTCX pin-compatible with the standard 74ACT244?
No, the 74ACTQ541MTCX is not pin-compatible with the 74ACT244. Although both are octal buffers, the 74ACTQ541MTCX uses a flow-through pinout (inputs on left, outputs on right), whereas the 74ACT244 places inputs and outputs on the same side. This difference requires PCB layout revision-not just footprint substitution-to replace one with the other.
What is the significance of the "Q" in the 74ACTQ541MTCX part number?
The "Q" in 74ACTQ541MTCX denotes Fairchild's Quiet Series™ implementation, which integrates GTO™ output control, undershoot correction, and split-ground bus architecture. This distinguishes it from standard ACT devices by guaranteeing low simultaneous switching noise (VOLP/VOLV), tighter output skew, and improved dynamic threshold performance under real-world bus loading.
Can the 74ACTQ541MTCX drive a 50 Ω transmission line directly?
Yes, the 74ACTQ541MTCX can drive a 50 Ω transmission line directly: its ±24 mA output drive capability meets the current demand for 5 V logic into 50 Ω (requiring ±100 mA for full swing), and its 7.5 ns max propagation delay ensures signal integrity up to ~100 MHz. However, source-series termination (e.g., 33 Ω) is recommended to damp reflections in longer traces.
74ACTQ541MTCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACTQ
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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-TSSOP
74ACTQ541MTCX FAQ
1.How can I place an order for 74ACTQ541MTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACTQ541MTCX 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 74ACTQ541MTCX reliable?
The price and inventory of 74ACTQ541MTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACTQ541MTCX is usually 5 days.
3.What payment methods are accepted for 74ACTQ541MTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACTQ541MTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACTQ541MTCX?
74ACTQ541MTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACTQ541MTCX 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 74ACTQ541MTCX?
For technical support, including 74ACTQ541MTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACTQ541MTCX requirements.
6.How does Aetrix verify that 74ACTQ541MTCX is sourced from the original manufacturer or authorized distributors?
All 74ACTQ541MTCX 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 74ACTQ541MTCX meets industry standards.
7.What is the process for return or replacement of 74ACTQ541MTCX?
All 74ACTQ541MTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74ACTQ541MTCX, 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 74ACTQ541MTCX part is unused and in its original packaging.
Return procedure for 74ACTQ541MTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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