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Texas Instruments SN74LVC74AQDRQ1
- Part No.:
- SN74LVC74AQDRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LVC74AQDRQ1.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,260
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Product details
Overview
SN74LVC74AQDRQ1 from Texas Instruments is an automotive-grade dual positive-edge-triggered D-type flip-flop with independent clear and preset inputs, designed for 2V–3.6V operation in safety-critical vehicle systems. It delivers 5.2ns max propagation delay at 3.3V, supports 5.5V-tolerant inputs for mixed-voltage interfacing, and operates across –40°C to +125°C.
For engineers reviewing the SN74LVC74AQDRQ1 datasheet, SN74LVC74AQDRQ1 pinout, SN74LVC74AQDRQ1 application, or SN74LVC74AQDRQ1 equivalent, this page provides verified functional roles, validated timing specs, confirmed WQFN-14 (BQA) and SOIC-14 (D) package mappings, and automotive-qualified substitution guidance - all extracted from TI's production SCES481E datasheet (August 2024 revision).
Technical Context
This device implements two independent edge-triggered storage elements with asynchronous active-low clear (CLR) and preset (PRE) controls, enabling immediate state override regardless of clock phase. Each flip-flop transfers D-input data to Q/Q̅ outputs on the rising edge of CLK, with setup time as low as 3.0ns and hold time of 1ns at 3.3V.
Its 5.5V-tolerant inputs allow direct interfacing with legacy 5V logic while operating from a 3.3V supply, eliminating level-shifter requirements in mixed-voltage domains. The design incorporates ground-bounce (VOLP <0.8V) and undershoot (VOHV >2V) mitigation features critical for noise-sensitive automotive control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2V–3.6V - Enables direct integration into 3.3V automotive power domains without regulation overhead. |
| Max propagation delay | 5.2ns at VCC = 3.3V - Supports ≥100MHz clock operation in real-time control loops. |
| Input voltage tolerance | Up to 5.5V - Allows direct connection to 5V microcontrollers or sensors without external translators. |
| Operating temperature | –40°C to +125°C - Qualified per AEC-Q100 Grade 1 for engine bay and ADAS applications. |
| Output drive strength | ±24mA at VCC = 3V - Sufficient to drive multiple LVC loads or small capacitive traces without buffering. |
| Power dissipation capacitance | 51pF per flip-flop at 10MHz - Predictable dynamic power consumption for thermal budgeting in dense PCB layouts. |
Pinout & Package
SN74LVC74AQDRQ1 is available in SOIC-14 (D) and WQFN-14 (BQA) packages. The SOIC variant measures 8.65mm × 6mm (body: 8.65mm × 3.91mm); the WQFN variant is 3mm × 2.5mm with exposed thermal pad requiring GND connection via multiple vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLK, 2CLK | Positive-edge clock input | Triggers synchronous data capture on rising transition; immune to slow-rising edges due to Schmitt-trigger-like threshold behavior. |
| 1CLR, 2CLR | Asynchronous clear input | Active-low reset: forces Q = LOW and Q̅ = HIGH immediately, overriding clock and data states. |
| 1PRE, 2PRE | Asynchronous preset input | Active-low set: forces Q = HIGH and Q̅ = LOW immediately, independent of clock timing. |
| 1D, 2D | Data input | Samples and latches logic level at rising CLK edge if PRE/CLR are inactive (HIGH). |
| 1Q, 2Q | True output | Reflects latched D value after CLK↑; drives downstream logic or status indicators with rail-to-rail swing. |
| 1Q̅, 2Q̅ | Inverted output | Complementary to Q; enables differential signaling or eliminates external inverters in toggle configurations. |
| VCC | Supply terminal | Must be bypassed with 0.1µF capacitor placed adjacent to pin to suppress switching noise and ensure stable timing. |
| GND | Ground reference | Common return path for all signals and power; thermal pad in BQA package must connect to internal PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 1 (–40°C to +125°C) qualification ensures reliability in under-hood and ADAS ECUs without derating. |
| 5.5V-tolerant inputs | Eliminates need for discrete level shifters when interfacing with 5V CAN transceivers or legacy sensor interfaces. |
| Low ground bounce | VOLP <0.8V at 3.3V ensures signal integrity in high-speed sampling paths where supply rail noise affects ADC references. |
| Fast switching | 5.2ns tpd enables use in 100MHz clock domains for real-time diagnostics and PWM synchronization. |
| Asynchronous control | Independent PRE/CLR pins per channel allow deterministic initialization or fault recovery without waiting for clock edges. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Capturing crankshaft position pulses and synchronizing fuel injection timing with camshaft signals. IC Role / Device Role / Timing Role: Dual D-flip-flop acts as synchronized edge detector and pulse stretcher, aligning sensor events to ECU master clock domain. Use Value: 5.2ns propagation delay ensures sub-microsecond timing alignment critical for ±1° ignition timing accuracy. | Use Scenario: Validating radar sensor frame sync signals before forwarding to SoC image processor. IC Role / Device Role / Timing Role: Glitch-free metastability filtering for asynchronous sensor interrupts entering deterministic processing pipeline. Use Value: Asynchronous PRE/CLR enables forced reset during radar reconfiguration without disrupting ongoing video stream timing. |
| Automotive Infotainment Display | Electric Power Steering (EPS) |
Use Scenario: Debouncing physical button inputs and generating clean interrupt requests for touchscreen controller MCU. IC Role / Device Role / Timing Role: Dual latch buffers mechanical switch transitions, rejecting contact bounce using synchronized clock sampling. Use Value: 5.5V-tolerant inputs accept direct connection to 5V panel switches, reducing BOM count by eliminating external resistors. | Use Scenario: Isolating torque sensor SPI clock domain from motor driver PWM noise in EPS control module. IC Role / Device Role / Timing Role: Synchronizer between noisy motor gate-drive logic and precision analog sensor interface. Use Value: Low VOLP (<0.8V) prevents false triggering of torque-sensor ADC reference rails during high-current switching events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual D-flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC74ADRQ1 | Identical logic function and electrical specs; differs only in SOIC-14 packaging (no WQFN option) and RoHS-compliant lead finish. | Same automotive qualification and temperature range; suitable where board space permits larger SOIC footprint. | Select SN74LVC74ADRQ1 when legacy SOIC layout reuse is required and thermal pad attachment is not needed. |
| MC74LCX74DTG | Lower VCC range (2.0V–3.6V), similar tpd (5.5ns), but lacks AEC-Q100 qualification and has no 5.5V-tolerant inputs. | Not approved for automotive safety-critical use; requires external level shifting for 5V interfaces. | Choose MC74LCX74DTG only for non-automotive industrial control where cost is prioritized over qualification and voltage flexibility. |
Compared with SN74LVC74ADRQ1, SN74LVC74AQDRQ1 offers identical functionality in a thermally enhanced WQFN package with exposed pad - critical for high-density automotive modules. Versus MC74LCX74DTG, it adds AEC-Q100 compliance and 5.5V input tolerance, enabling drop-in replacement in safety-certified designs without redesign.
Availability
SN74LVC74AQDRQ1 is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, infotainment head units, and electric power steering systems requiring stable component supply across extended automotive lifecycles.
Supply support for SN74LVC74AQDRQ1 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 ICs, with decades of experience in high-reliability automotive electronics.
The SN74LVC74A-Q1 belongs to TI's automotive logic portfolio, engineered specifically for timing-critical control functions in AEC-Q100-compliant vehicle subsystems - emphasizing noise immunity, wide voltage operation, and robust metastability handling.
FAQ
What is the maximum clock frequency supported by SN74LVC74AQDRQ1?
SN74LVC74AQDRQ1 supports a maximum clock frequency of 100MHz at VCC = 3.3V ±0.3V, as specified in the switching characteristics table (Section 4.7). This is enabled by its 5.2ns maximum propagation delay (tpd) and 3.3ns minimum pulse width requirement for CLK high/low periods.
Does SN74LVC74AQDRQ1 require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs of SN74LVC74AQDRQ1 must be held at VCC or GND to prevent floating states that cause undefined operation and increased ICC. TI's application report SCBA004 explicitly mandates this practice; leaving inputs unconnected risks erratic output behavior and excessive current draw.
Can SN74LVC74AQDRQ1 operate with a 2.5V supply voltage?
Yes, SN74LVC74AQDRQ1 is fully specified for operation from 2.0V to 3.6V per Section 4.3. At 2.5V, it maintains guaranteed timing (fclock ≥83MHz) and output drive (IOL = 12mA), though propagation delay increases slightly versus 3.3V operation.
What is the purpose of the exposed thermal pad in the BQA package of SN74LVC74AQDRQ1?
The exposed thermal pad in SN74LVC74AQDRQ1's WQFN (BQA) package must be soldered to the PCB ground plane using multiple vias. It reduces junction-to-board thermal resistance (RθJB = 70.9°C/W) and improves long-term reliability in high-power-density automotive modules by dissipating heat directly into the board.
Is SN74LVC74AQDRQ1 pin-compatible with the commercial-grade SN74LVC74A?
Yes - SN74LVC74AQDRQ1 shares identical pin configuration, electrical behavior, and logic function with the commercial SN74LVC74A, differing only in AEC-Q100 qualification, extended temperature range (–40°C to +125°C), and automotive-specific test screening. Pinouts for SOIC-14 and WQFN-14 packages match exactly.
SN74LVC74AQDRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 150 MHz
- Max Propagation Delay @ V, Max CL:
- 5.2ns @ 3.3V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 3.6V
- Current - Quiescent (Iq):
- 10 µA
- Input Capacitance:
- 5 pF
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74LVC74AQDRQ1 FAQ
1.How can I place an order for SN74LVC74AQDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC74AQDRQ1 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 SN74LVC74AQDRQ1 reliable?
The price and inventory of SN74LVC74AQDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC74AQDRQ1 is usually 5 days.
3.What payment methods are accepted for SN74LVC74AQDRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC74AQDRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC74AQDRQ1?
SN74LVC74AQDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC74AQDRQ1 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 SN74LVC74AQDRQ1?
For technical support, including SN74LVC74AQDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC74AQDRQ1 requirements.
6.How does Aetrix verify that SN74LVC74AQDRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74LVC74AQDRQ1 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 SN74LVC74AQDRQ1 meets industry standards.
7.What is the process for return or replacement of SN74LVC74AQDRQ1?
All SN74LVC74AQDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC74AQDRQ1, 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 SN74LVC74AQDRQ1 part is unused and in its original packaging.
Return procedure for SN74LVC74AQDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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