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Texas Instruments 74ACT8541QWRKSRQ1

Name: 74ACT8541QWRKSRQ1
Brand: Texas Instruments
SKU: 74ACT8541QWRKSRQ1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74ACT8541QWRKSRQ1

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-VFQFN Exposed Pad

Datasheet:: 74ACT8541QWRKSRQ1.pdf

Description:: AUTOMOTIVE EIGHT-CHANNEL 4.5V-TO

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Product details

Overview

74ACT8541QWRKSRQ1 from Texas Instruments is an automotive-grade octal buffer IC with 3-state outputs and Schmitt-trigger inputs, operating from 4.5V to 5.5V, delivering ±24mA continuous output drive at 5V, and featuring a maximum propagation delay of 9.6ns (V_CC = 5V, C_L = 50pF). It supports AEC-Q100 Grade 1 (−40°C to +125°C) and drives 50Ω transmission lines in automotive control and signal conditioning applications.

For engineers reviewing the 74ACT8541QWRKSRQ1 datasheet, 74ACT8541QWRKSRQ1 pinout, 74ACT8541QWRKSRQ1 application, or 74ACT8541QWRKSRQ1 equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, automotive-qualified thermal and ESD performance, and two confirmed alternative parts with functional and application-level distinctions.

Technical Context

The 74ACT8541QWRKSRQ1 implements eight independent CMOS buffers with dual active-low 3-state enable inputs (OE1 and OE2), requiring both to be low for output activation. Its TTL-compatible Schmitt-trigger inputs provide hysteresis (ΔV_T = 0.4–1.5V) to reject slow or noisy signals, while balanced push-pull outputs support ±24mA continuous and up to ±75mA short-burst drive.

It uses a wettable-flank VQFN (RKS) package with 20 pins and a 4.5mm × 2.5mm body, optimized for AOI inspection and thermal performance (R_θJA = 67.7°C/W). The device operates within strict automotive thermal and ESD constraints: HBM ±2000V (Level 2), CDM ±1000V (Level C4B), and junction temperature up to 150°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5V to 5.5V - ensures compatibility with standard 5V automotive power rails and stable logic thresholds across temperature.
Propagation Delay	Max 9.6ns (t_PHL, V_CC = 5V, C_L = 50pF) - enables reliable timing in high-speed digital control loops and bus buffering.
Output Drive	±24mA continuous - sufficient to directly drive LEDs, relays, or multiple CMOS inputs without external buffers.
Hysteresis (ΔV_T)	0.4V to 1.5V - provides noise immunity against >100mV interference on long harnesses or unshielded sensors.
Input Thresholds	V_T+ = 1.2–2.1V, V_T− = 0.5–1.4V - ensures robust interfacing with legacy TTL and industrial voltage-level signals.
ESD Rating	HBM ±2000V, CDM ±1000V - meets AEC-Q100-002/-011 requirements for under-hood and infotainment module reliability.
Operating Temperature	−40°C to +125°C (Grade 1) - qualified for engine control units, body controllers, and ADAS sensor interfaces.

Pinout & Package

74ACT8541QWRKSRQ1 is packaged in a 20-pin wettable-flank VQFN (RKS) with 4.5mm × 2.5mm body size and exposed thermal pad (connectable to GND or left floating).

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1, OE2	Active-low 3-state enable inputs - both must be low to activate all eight outputs; enables shared bus arbitration.
2–9	A1–A8	Independent Schmitt-trigger input channels - tolerate slow edges and noise; require termination to V_CC or GND when unused.
10	GND	Ground reference - serves as current return path for all outputs and internal logic; connects to thermal pad in RKS package.
11–18	Y8–Y1	CMOS 3-state buffered outputs - actively drive high/low or enter high-Z; support parallel connection for increased drive strength.
20	V_CC	Positive supply - powers all logic and output stages; requires local 0.1µF bypass capacitor per TI layout guidelines.
Thermal Pad	Thermal & Electrical Reference	Exposed copper pad beneath package - improves heat dissipation (R_θJB = 40.4°C/W) and may be tied to GND for EMI reduction.

Key Features

Feature	Design Value
Schmitt-trigger inputs	Provides 0.4–1.5V hysteresis to reject noise on long cables or unshielded sensor lines in automotive environments.
Wettable-flank QFN (RKS)	Enables automated optical inspection (AOI) of solder joints on bottom-side leads, improving manufacturing yield in automotive PCB assembly.
Dual 3-state enable (OE1/OE2)	Allows fail-safe bus control: outputs go high-Z only when both enables are asserted, preventing unintended bus contention.
±75mA short-burst drive	Supports brief inrush currents for relay coils or capacitive loads without violating absolute max ratings or causing latch-up.
AEC-Q100 Grade 1 qualification	Validated for operation from −40°C to +125°C ambient, meeting requirements for powertrain, chassis, and body electronics modules.

Applications

Engine Control Unit (ECU) Signal Conditioning	Automotive Body Control Module (BCM)
Use Scenario: Buffering and noise-filtering crankshaft position sensor signals before ADC sampling in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Octal Schmitt-trigger buffer isolates noisy analog sensor outputs and converts slow-rising edges into clean digital transitions for microcontroller timing capture. Use Value: Eliminates false edge detection caused by EMI on engine harnesses, ensuring accurate ignition timing and fuel injection sequencing.	Use Scenario: Driving door lock actuators, window lift motors, and interior lighting via centralized BCM microcontroller GPIO expansion. IC Role / Device Role / Timing Role: 3-state octal buffer provides level-shifted, current-boosted control signals with bus isolation during sleep mode. Use Value: Enables single MCU to manage multiple high-current peripherals while maintaining low-power sleep states via OE-controlled high-Z outputs.
ADAS Camera Interface Buffering	Infotainment Display Backlight Control
Use Scenario: Re-timing and driving serialized video data (e.g., sub-LVDS or RSDS) from camera sensors to SoC receivers over 15+ cm PCB traces. IC Role / Device Role / Timing Role: Low-skew octal buffer with 50Ω line drive capability maintains signal integrity on differential pairs in vision processing subsystems. Use Value: Reduces jitter and overshoot on high-speed imaging links, preserving pixel clock accuracy and minimizing frame sync errors.	Use Scenario: PWM dimming control of LED backlight strings in instrument clusters and center displays using MCU-generated 100–500Hz signals. IC Role / Device Role / Timing Role: Schmitt-trigger input accepts variable-duty-cycle PWM with slow rise/fall times; push-pull output drives LED driver enable inputs directly. Use Value: Prevents flicker and brightness instability caused by noise-induced false triggering on long flex-cable connections to display modules.

Engine Control Unit (ECU) Signal Conditioning

Automotive Body Control Module (BCM)

Use Scenario: Buffering and noise-filtering crankshaft position sensor signals before ADC sampling in gasoline/diesel ECUs.

IC Role / Device Role / Timing Role: Octal Schmitt-trigger buffer isolates noisy analog sensor outputs and converts slow-rising edges into clean digital transitions for microcontroller timing capture.

Use Value: Eliminates false edge detection caused by EMI on engine harnesses, ensuring accurate ignition timing and fuel injection sequencing.

Use Scenario: Driving door lock actuators, window lift motors, and interior lighting via centralized BCM microcontroller GPIO expansion.

IC Role / Device Role / Timing Role: 3-state octal buffer provides level-shifted, current-boosted control signals with bus isolation during sleep mode.

Use Value: Enables single MCU to manage multiple high-current peripherals while maintaining low-power sleep states via OE-controlled high-Z outputs.

ADAS Camera Interface Buffering

Infotainment Display Backlight Control

Use Scenario: Re-timing and driving serialized video data (e.g., sub-LVDS or RSDS) from camera sensors to SoC receivers over 15+ cm PCB traces.

IC Role / Device Role / Timing Role: Low-skew octal buffer with 50Ω line drive capability maintains signal integrity on differential pairs in vision processing subsystems.

Use Value: Reduces jitter and overshoot on high-speed imaging links, preserving pixel clock accuracy and minimizing frame sync errors.

Use Scenario: PWM dimming control of LED backlight strings in instrument clusters and center displays using MCU-generated 100–500Hz signals.

IC Role / Device Role / Timing Role: Schmitt-trigger input accepts variable-duty-cycle PWM with slow rise/fall times; push-pull output drives LED driver enable inputs directly.

Use Value: Prevents flicker and brightness instability caused by noise-induced false triggering on long flex-cable connections to display modules.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal buffer with 3-state and Schmitt-trigger applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LV8T245QPWRQ1	8-bit bidirectional translator (3.3V ↔ 5V), no Schmitt inputs, lower drive (±8mA), LVCMOS logic family.	Used where voltage translation between domains is required; unsuitable for noisy analog-sensor interfacing due to lack of hysteresis.	Select when interfacing mixed-voltage MCUs and peripherals; avoid for direct sensor buffering in harsh EMI environments.
SN74AHC541QPWRQ1	Octal buffer with 3-state outputs but standard CMOS (non-Schmitt) inputs; same 4.5–5.5V range and ±8mA drive.	Lacks noise immunity for slow or noisy inputs; requires external RC filtering or pull-ups for marginal signals.	Choose for clean digital bus extension only; not recommended for engine bay or chassis-mounted sensor nodes.

Compared with 74ACT8541QWRKSRQ1, SN74LV8T245QPWRQ1 adds voltage translation but removes Schmitt noise rejection, while SN74AHC541QPWRQ1 retains pinout compatibility but sacrifices input robustness-making 74ACT8541QWRKSRQ1 uniquely suited for unconditioned automotive sensor signal conditioning.

Availability

74ACT8541QWRKSRQ1 is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera interfaces, and infotainment display systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74ACT8541QWRKSRQ1 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, embedded processing, and automotive electronics, with decades of AEC-Q100 qualification experience and broad automotive reference design support.

The SN74ACT8541-Q1 belongs to TI's automotive logic portfolio, designed specifically for robust signal conditioning, bus buffering, and peripheral interface in safety-critical vehicle subsystems operating under extreme thermal and EMI conditions.

FAQ

What is the maximum continuous output current specification for the 74ACT8541QWRKSRQ1?

The 74ACT8541QWRKSRQ1 supports ±24mA continuous output current per channel at V_CC = 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 ensures reliable drive capability for LEDs, relays, and CMOS inputs without thermal derating under typical automotive ambient conditions.

Does the 74ACT8541QWRKSRQ1 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs of the 74ACT8541QWRKSRQ1 must be terminated to a valid logic level (V_CC or GND) to prevent floating states that cause excessive current consumption and undefined output behavior. A 10kΩ resistor is recommended for most cases, as specified in TI's application report "Implications of Slow or Floating CMOS Inputs" and confirmed in Section 7.3.2 of the 74ACT8541QWRKSRQ1 datasheet.

Can the 74ACT8541QWRKSRQ1 drive 50Ω transmission lines directly?

Yes - the 74ACT8541QWRKSRQ1 is explicitly characterized to drive 50Ω transmission lines, as stated in its Features section and validated in Application Section 8.1. Its output impedance and drive strength allow clean signal launch onto controlled-impedance PCB traces up to 12cm in length, with optional series damping resistors recommended to suppress ringing in mismatched configurations.

What is the purpose of the thermal pad on the 74ACT8541QWRKSRQ1 RKS package?

The exposed thermal pad on the 74ACT8541QWRKSRQ1's RKS package reduces junction-to-board thermal resistance to 40.4°C/W, significantly improving power dissipation during sustained output loading. Per datasheet Table 4-1, it may be connected to GND for enhanced EMI suppression and mechanical stability, or left floating if board layout constraints prohibit grounding.

How do OE1 and OE2 interact to control output states in the 74ACT8541QWRKSRQ1?

In the 74ACT8541QWRKSRQ1, both OE1 and OE2 must be driven low simultaneously to enable outputs; if either is high, all eight Y outputs enter high-impedance state. This dual-enable architecture prevents accidental bus activation during power-up or fault conditions, providing deterministic fail-safe behavior critical for automotive communication and control subsystems.

74ACT8541QWRKSRQ1 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74ACT

Package/Case:: 20-VFQFN Exposed Pad

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:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 20-VQFN (2.5x4.5)

74ACT8541QWRKSRQ1 FAQ

1.How can I place an order for 74ACT8541QWRKSRQ1 through Aetrix?

Please submit a Request for Quotation (RFQ) for 74ACT8541QWRKSRQ1 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 74ACT8541QWRKSRQ1 reliable?

The price and inventory of 74ACT8541QWRKSRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACT8541QWRKSRQ1 is usually 5 days.

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74ACT8541QWRKSRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74ACT8541QWRKSRQ1 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 74ACT8541QWRKSRQ1?

For technical support, including 74ACT8541QWRKSRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACT8541QWRKSRQ1 requirements.

6.How does Aetrix verify that 74ACT8541QWRKSRQ1 is sourced from the original manufacturer or authorized distributors?

All 74ACT8541QWRKSRQ1 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 74ACT8541QWRKSRQ1 meets industry standards.

7.What is the process for return or replacement of 74ACT8541QWRKSRQ1?

All 74ACT8541QWRKSRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with 74ACT8541QWRKSRQ1, 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 74ACT8541QWRKSRQ1 part is unused and in its original packaging.

Return procedure for 74ACT8541QWRKSRQ1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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