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STMicroelectronics 74ACT541TTR
- Part No.:
- 74ACT541TTR
- Manufacturer:
- STMicroelectronics
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ACT541TTR.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,444
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Product details
Overview
74ACT541TTR from STMicroelectronics is an advanced high-speed CMOS octal bus buffer with non-inverting 3-state outputs, designed for bidirectional data bus interfacing between TTL, NMOS, and CMOS systems. It operates from 4.5V to 5.5V, delivers 4ns typical propagation delay, supports ±24mA symmetrical output drive, and features dual enable inputs (G1/G2) for precise bus control in industrial and embedded digital systems.
For engineers reviewing the 74ACT541TTR datasheet, 74ACT541TTR pinout, 74ACT541TTR application, or 74ACT541TTR equivalent, key selection factors include its 50Ω transmission line driving capability, 2kV ESD immunity, balanced tPLH/tPHL delays, and TSSOP-20 package compatibility with high-density PCB layouts.
Technical Context
The device implements a dual-input AND logic gate for 3-state control: outputs enter high-impedance only when both G1 and G2 are high. Its sub-micron C2MOS process enables low ICC (4µA max at 25°C) while maintaining TTL-compatible input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V at VCC = 4.5–5.5V).
Input and output pins are arranged on opposite sides of the TSSOP-20 package to simplify PCB routing. All I/Os integrate protection diodes for 2kV HBM ESD immunity and transient voltage suppression, supporting robust operation across –55°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - Ensures stable operation across industrial power rail tolerances |
| tPD (Typ.) | 4ns at VCC = 5V - Enables timing-critical 100+ MHz bus cycles |
| IOL / IOH (Min) | 24mA - Drives 50Ω transmission lines directly without external termination |
| ICC (Max) | 4µA at TA = 25°C - Supports ultra-low static power in battery-backed or standby systems |
| VIH / VIL | 2.0V min / 0.8V max - Guarantees reliable logic-level translation from TTL and CMOS sources |
| ESD Rating | 2kV HBM - Protects against handling-induced discharge during assembly and field operation |
| Operating Temp | –55°C to +125°C - Qualified for extended temperature industrial and automotive under-hood applications |
Pinout & Package
TSSOP-20 package: 6.5mm × 4.4mm body, 0.65mm pitch, lead-free, RoHS-compliant surface-mount outline with exposed pad option (not thermally enhanced in base variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | G1, G2 | Active-high 3-state enable inputs - Both must be high to place all Yn outputs in high-Z |
| 2–9 | A1–A8 | Non-inverting data inputs - Accept TTL/CMOS logic levels; internally protected |
| 11–18 | Y1–Y8 | Buffered non-inverting outputs - Symmetrical ±24mA drive, 8pF typical COUT |
| 10 | GND | Digital ground reference - Shared return path for all I/O and supply currents |
| 20 | VCC | Positive supply - Must be decoupled locally with 100nF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Pin- and function-compatible with 74LS541 | Direct drop-in replacement for legacy TTL bus buffers without redesign |
| Inputs/outputs on opposite package sides | Reduces layer count and crosstalk in high-speed parallel bus layouts |
| Balanced tPLH ≅ tPHL | Minimizes duty cycle distortion in clocked data transfer paths |
| Improved latch-up immunity | Withstands transient overvoltage events without destructive parasitic thyristor activation |
| 2kV HBM ESD protection on all pins | Eliminates need for external TVS diodes in standard handling environments |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Interfacing microcontroller GPIO banks to multi-drop RS-485 transceiver control lines and sensor multiplexers. IC Role / Device Role / Timing Role: Octal non-inverting buffer with 3-state control isolates MCU pins during bus arbitration and enables hot-swap-safe signal routing. Use Value: 4ns propagation delay ensures setup/hold timing margins for 25MHz control bus clocks; ±24mA drive guarantees clean edges into 50Ω stubs. | Use Scenario: Level-shifting and bus isolation between 3.3V CAN controller and 5V analog sensor cluster interface. IC Role / Device Role / Timing Role: Bidirectional data buffer with independent G1/G2 enables selective channel gating during diagnostic mode transitions. Use Value: TTL-compatible VIH/VIL allows direct connection to legacy 5V sensor outputs; –55°C to +125°C rating meets AEC-Q100 Grade 2 requirements. |
| Test Equipment Digital I/O Card | Medical Imaging Data Acquisition |
Use Scenario: Driving 8-bit parallel data lanes from FPGA to D/A converters and relay driver arrays. IC Role / Device Role / Timing Role: High-speed bus buffer with low skew and matched rise/fall times preserves signal integrity across 15cm PCB traces. Use Value: Symmetrical output impedance (|IOH| = IOL = 24mA) minimizes reflection-induced jitter; 8pF COUT limits capacitive loading on source drivers. | Use Scenario: Isolating ADC output buses from FPGA-based image processing pipelines in portable ultrasound units. IC Role / Device Role / Timing Role: Low-power 3-state buffer enables dynamic bus partitioning to reduce EMI during RF transmit bursts. Use Value: 4µA max ICC at 25°C extends battery life; 2kV ESD rating protects sensitive analog front-end from coupling through shared ground planes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT541PW | TSSOP-20, identical AC/DC specs, TI's characterization includes tighter tPLH/tPHL matching (±0.3ns vs ±0.5ns) | Qualified to TI's enhanced flow for medical-grade traceability; same temp range | Select if full lot traceability and tighter propagation delay matching are required |
| 74VHC541FT | Smaller 6V VCC max, lower 3.3V–5.5V operating range, 7.5ns tPD (typ), 8mA drive | Lower power (2µA ICC) but insufficient for 50Ω line driving; suited for low-noise mixed-signal boards | Select only for cost-sensitive, non-critical timing applications where 50Ω drive is unnecessary |
Compared with SN74ACT541PW and 74VHC541FT, the 74ACT541TTR uniquely balances 4ns speed, ±24mA drive, and industrial temperature support in a standard TSSOP-20 footprint-making it optimal for high-reliability bus buffering where signal fidelity and ruggedness are co-prioritized.
Availability
74ACT541TTR is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, automotive body control modules, test equipment digital I/O cards, and medical imaging data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74ACT541TTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, power ICs, sensors, and analog components for industrial, automotive, and consumer markets.
The 74ACT series targets high-speed, low-power digital interface solutions-specifically engineered to replace legacy TTL logic while delivering CMOS efficiency and robustness in noise-prone environments.
FAQ
What is the maximum recommended operating frequency for 74ACT541TTR in a 50Ω transmission line environment?
The device supports reliable operation up to 100MHz in controlled-impedance layouts. Its 4ns typical propagation delay and 50Ω drive capability ensure clean edge rates (≤2.5ns rise/fall) into properly terminated lines. For sustained 100MHz data throughput, maintain CL ≤ 50pF per output and use local VCC decoupling.
Can 74ACT541TTR safely interface a 3.3V FPGA with a 5V peripheral without level-shifting circuitry?
No. While its inputs accept 3.3V as valid HIGH (VIH min = 2.0V), its outputs swing rail-to-rail (0V to VCC). Driving a 3.3V-tolerant input with 5V outputs risks damage unless the peripheral explicitly supports 5V-tolerant I/O. External clamping or resistor-divider networks are required for safe 3.3V system interfacing.
How does the dual-enable (G1/G2) architecture improve system-level bus management?
The AND-gated enable logic prevents accidental bus contention: both controls must be asserted to disable all outputs. This allows hierarchical control-e.g., G1 tied to system reset, G2 to software-configured bus grant-ensuring deterministic high-Z state entry during fault conditions or power sequencing.
Is thermal derating required when operating at 125°C ambient with full 24mA output loading?
Yes. At 125°C, the absolute maximum output current rating drops to ±18mA per pin (per ST's derating curve in AN435). Sustained 24mA loading at max temperature exceeds safe SOA limits and risks accelerated electromigration. Reduce load current or add forced airflow if operating near thermal limits.
74ACT541TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74ACT
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74ACT541TTR FAQ
1.How can I place an order for 74ACT541TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACT541TTR 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 74ACT541TTR reliable?
The price and inventory of 74ACT541TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT541TTR is usually 5 days.
3.What payment methods are accepted for 74ACT541TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACT541TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACT541TTR?
74ACT541TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACT541TTR 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 74ACT541TTR?
For technical support, including 74ACT541TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT541TTR requirements.
6.How does Aetrix verify that 74ACT541TTR is sourced from the original manufacturer or authorized distributors?
All 74ACT541TTR 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 74ACT541TTR meets industry standards.
7.What is the process for return or replacement of 74ACT541TTR?
All 74ACT541TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT541TTR, 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 74ACT541TTR part is unused and in its original packaging.
Return procedure for 74ACT541TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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