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Texas Instruments SN74ACT8541PWR
- Part No.:
- SN74ACT8541PWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ACT8541PWR.pdf
- Description:
- EIGHT-CHANNEL 4.5V-TO-5.5V BUFFE
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74ACT8541PWR from Texas Instruments is an octal buffer IC with 3-state outputs and Schmitt-trigger inputs, operating at 4.5V–5.5V supply. It delivers ±24mA continuous output drive, supports 50Ω transmission line driving, and features 9.6ns max propagation delay (VCC = 5V, CL = 50pF). It is used in noise-immune digital signal buffering for industrial control interfaces.
For engineers reviewing the SN74ACT8541PWR datasheet, SN74ACT8541PWR pinout, SN74ACT8541PWR application, or SN74ACT8541PWR equivalent, key selection criteria include TTL-compatible Schmitt-trigger input hysteresis (ΔVT = 0.4–1.5V), dual active-low output enable (OE1/OE2), 20-pin TSSOP package thermal resistance (RθJA = 126.2°C/W), and guaranteed operation from –40°C to +125°C.
Technical Context
The SN74ACT8541PWR implements eight independent CMOS buffers with positive-logic Schmitt-trigger inputs and balanced push-pull 3-state outputs. Its dual OE inputs require both to be low for output activation, enabling fail-safe bus control in shared-line systems.
Input hysteresis (VT+ − VT−) ranges from 0.4V to 1.5V across VCC, ensuring robust immunity to slow-rising or noisy signals. Output switching characteristics are specified with CL = 50pF, supporting reliable timing in 50Ω impedance-matched traces up to 12 cm.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - ensures compatibility with standard 5V TTL/CMOS logic rails and stable operation under rail tolerance. |
| Propagation Delay | 9.6ns max (A→Y, VCC = 5V, CL = 50pF) - enables use in high-speed digital interfaces up to ~100MHz clock-equivalent systems. |
| Output Drive | ±24mA continuous - sufficient to directly drive LEDs, relays, or multiple 74ACT loads without external buffers. |
| Input Hysteresis | 0.4V–1.5V (ΔVT) - rejects noise on slow edges and prevents chatter during signal transitions in industrial environments. |
| Operating Temp | –40°C to +125°C - qualified for extended-temperature industrial and automotive under-hood applications. |
| Input Thresholds | VT+ = 1.2–2.1V, VT− = 0.5–1.4V - provides TTL-compatible logic levels while retaining CMOS low power and high noise margin. |
| Thermal Resistance | RθJA = 126.2°C/W (PW package) - defines maximum allowable power dissipation (≤397mW at ΔT = 50°C) for PCB layout planning. |
Pinout & Package
SN74ACT8541PWR uses a 20-pin TSSOP (PW) package measuring 6.5mm × 6.4mm (body: 6.5mm × 4.4mm), with exposed thermal pad not present in this variant. Pin functions are standardized across all package options.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable inputs - both must be low to activate all eight outputs; enables bus arbitration and power gating. |
| 2–9 | A1–A8 | Independent Schmitt-trigger input channels - tolerate slow/noisy signals; each requires termination to VCC or GND if unused. |
| 10 | GND | Ground reference - must be low-impedance connection to support ±24mA per output sink/source current. |
| 11–18 | Y1–Y8 | 3-state buffered outputs - actively driven high/low when enabled; high-impedance when disabled for bus sharing. |
| 20 | VCC | Positive supply - requires local 0.1μF bypass capacitor; supplies all output current and internal logic. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible Schmitt-trigger inputs | Enables direct interfacing with legacy TTL outputs and rejection of >100ns noise pulses without external filtering. |
| Dual active-low output enables (OE1/OE2) | Provides redundant control for fault-tolerant bus drivers; prevents accidental output activation if one enable fails high. |
| ±24mA continuous output drive | Eliminates need for external driver transistors when controlling small relays, optocouplers, or indicator LEDs. |
| 50Ω transmission line drive capability | Supports clean signal integrity over PCB traces up to 12 cm without series termination resistors in many cases. |
| 125°C maximum operating temperature | Validates use in sealed enclosures or near heat sources where ambient exceeds commercial-grade limits. |
Applications
| Industrial Sensor Interface | LED Status Indication |
|---|---|
Use Scenario: Buffering slow-rising analog comparator outputs or noisy limit-switch signals before PLC input modules. IC Role / Device Role / Timing Role: Signal conditioner and noise-immune level translator between field sensors and digital controllers. Use Value: Schmitt-trigger hysteresis eliminates contact bounce false triggers; 3-state outputs allow multiplexing of multiple sensor lines onto shared data buses. | Use Scenario: Driving multiple panel-mounted status LEDs from microcontroller GPIO pins with limited current capability. IC Role / Device Role / Timing Role: Current-boosting digital buffer with logic-level translation from 3.3V MCU to 5V LED supply rail. Use Value: ±24mA per channel drives standard 20mA LEDs directly; 3-state mode enables dynamic LED bank selection without hardware reconfiguration. |
| Relay Control Logic | Legacy Bus Signal Conditioning |
Use Scenario: Isolating and amplifying microcontroller outputs to energize 5V/12V relay coils in HVAC or factory automation panels. IC Role / Device Role / Timing Role: High-current digital switch with controlled rise/fall times to reduce EMI during coil switching. Use Value: Fast 9.6ns propagation delay ensures precise timing coordination; output clamping diodes suppress inductive kickback spikes. | Use Scenario: Interfacing modern FPGA I/O banks to legacy 5V TTL backplane buses with marginal signal integrity. IC Role / Device Role / Timing Role: Impedance-matched line driver with controlled edge rates for long trace routing. Use Value: Drives 50Ω lines directly; Schmitt inputs recover degraded waveforms; 3-state outputs prevent bus contention during hot-swap events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer with 3-state and Schmitt-trigger input applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT244PW | No Schmitt-trigger inputs; standard CMOS thresholds (VIL/VIH fixed at 0.8V/2.0V); lower drive (±4mA). | Suitable only for clean, fast-rising signals; cannot replace SN74ACT8541PWR in noisy or slow-edge environments. | Select when interfacing with well-behaved CMOS/FPGA outputs and board space/power budget constraints prioritize lower ICC. |
| SN74LVTH244APW | 3.3V-only supply (2.7–3.6V); higher speed (tPD = 3.2ns); no Schmitt inputs; ±24mA drive. | Designed for 3.3V LVT logic families; incompatible with 5V systems unless level-shifted; unsuitable for direct TTL interface. | Choose for high-speed 3.3V bus buffering where noise immunity is provided upstream; not drop-in compatible with SN74ACT8541PWR. |
Compared with SN74HCT244PW and SN74LVTH244APW, the SN74ACT8541PWR uniquely combines 5V operation, Schmitt-trigger noise immunity, and ±24mA drive in a single octal buffer-making it irreplaceable in industrial sensor conditioning and legacy system integration where signal integrity cannot be assumed.
Availability
SN74ACT8541PWR is available at Aetrix Electronics and suitable for industrial sensor interfaces, LED status indication, relay control logic, and legacy bus signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for SN74ACT8541PWR 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of experience in high-reliability logic and interface solutions.
The SN74ACT8541PWR belongs to TI's advanced ACT (Advanced CMOS Technology) logic family, designed specifically for noise-immune digital signal conditioning in harsh industrial and automotive environments.
FAQ
What is the maximum continuous output current per channel for SN74ACT8541PWR?
The SN74ACT8541PWR supports ±24mA continuous output current per channel at VCC = 4.5V to 5.5V, as specified in the Recommended Operating Conditions table. This rating applies across the full –40°C to +125°C temperature range and is validated for sustained operation without thermal derating under typical PCB layout conditions.
Does SN74ACT8541PWR require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs of SN74ACT8541PWR must be terminated to either VCC or GND to prevent floating states that cause excessive current consumption or undefined logic behavior. A 10kΩ resistor is recommended for most applications, as confirmed in TI's "Implications of Slow or Floating CMOS Inputs" application report.
Can SN74ACT8541PWR drive a 50Ω transmission line without series termination?
Yes - the SN74ACT8541PWR is explicitly characterized to drive 50Ω transmission lines, as stated in its Features section. With proper PCB layout (short traces, controlled impedance), it achieves clean signal integrity up to 12 cm without external series resistors, though damping may still be needed for longer runs or mismatched receivers.
What is the function of the two output enable pins (OE1 and OE2) on SN74ACT8541PWR?
Both OE1 and OE2 on SN74ACT8541PWR are active-low inputs that must be simultaneously low to enable all eight outputs. If either is high, all outputs enter high-impedance state. This dual-enable architecture provides redundancy and prevents unintended bus activation due to single-point failure or noise glitches.
Is SN74ACT8541PWR compatible with 3.3V logic inputs?
No - SN74ACT8541PWR is a 5V-only device with TTL-compatible Schmitt-trigger inputs (VIL ≤ 0.8V, VIH ≥ 2.0V typical), but its absolute minimum input high voltage is 2.0V at VCC = 4.5V. While some 3.3V logic outputs may meet this threshold, reliable interoperability requires verification of actual VOH/VOL margins; level-shifting is recommended for guaranteed compatibility.
SN74ACT8541PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- 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:
- Schmitt Trigger
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74ACT8541PWR FAQ
1.How can I place an order for SN74ACT8541PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT8541PWR 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 SN74ACT8541PWR reliable?
The price and inventory of SN74ACT8541PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT8541PWR is usually 5 days.
3.What payment methods are accepted for SN74ACT8541PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT8541PWR transactions.
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4.How is shipping managed for SN74ACT8541PWR?
SN74ACT8541PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT8541PWR 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 SN74ACT8541PWR?
For technical support, including SN74ACT8541PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT8541PWR requirements.
6.How does Aetrix verify that SN74ACT8541PWR is sourced from the original manufacturer or authorized distributors?
All SN74ACT8541PWR 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 SN74ACT8541PWR meets industry standards.
7.What is the process for return or replacement of SN74ACT8541PWR?
All SN74ACT8541PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT8541PWR, 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 SN74ACT8541PWR part is unused and in its original packaging.
Return procedure for SN74ACT8541PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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