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Texas Instruments SN74HC74QDRG4Q1
- Part No.:
- SN74HC74QDRG4Q1
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74HC74QDRG4Q1.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,398
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Product details
Overview
SN74HC74QDRG4Q1 from Texas Instruments is an automotive-qualified dual D-type positive-edge-triggered flip-flop with independent asynchronous clear and preset inputs per channel. It operates from 2 V to 6 V, supports fanout up to 10 LSTTL loads, and delivers guaranteed timing performance up to 36 MHz at 6 V across –40°C to +125°C. It is used in clock division (÷2/÷4) and momentary-to-toggle switch conversion in vehicle body control modules.
For engineers reviewing the SN74HC74QDRG4Q1 datasheet, SN74HC74QDRG4Q1 pinout, SN74HC74QDRG4Q1 application, or SN74HC74QDRG4Q1 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, dual-channel independent asynchronous control, propagation delay ≤59 ns (6 V), and SOIC-14 package compatibility with industrial-grade thermal derating.
Technical Context
The SN74HC74QDRG4Q1 implements two fully independent CMOS D-flip-flop channels, each with separate active-low asynchronous preset (PRE) and clear (CLR) inputs that override clock and data. Its positive-edge-triggered clock inputs respond only to rising transitions, and internal logic ensures metastability immunity under valid setup/hold timing.
It uses balanced push-pull CMOS outputs capable of sourcing/sinking ±25 mA, with input clamp diodes for ESD robustness (HBM ±2000 V, CDM ±1000 V). The device meets AEC-Q100 Grade 1 requirements and features standard CMOS inputs with ≤10 pF input capacitance and <±1000 nA leakage at 6 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - enables direct interface with 3.3 V and 5 V microcontrollers and legacy automotive systems |
| Operating Temperature | –40°C to +125°C - qualified for engine bay and powertrain control unit environments |
| Max Clock Frequency | 36 MHz at 6 V - supports high-speed clock division and state sequencing in real-time control loops |
| Propagation Delay | 15–59 ns (6 V) - ensures deterministic timing margins for synchronous logic design |
| Output Drive | ±25 mA per output - sufficient to drive multiple LSTTL inputs or small LED indicators without buffering |
| Input Capacitance | ≤10 pF - minimizes loading on upstream clock or signal sources |
| Power Dissipation Cap. | 35 pF per gate - enables accurate dynamic power estimation in battery-sensitive applications |
Pinout & Package
SN74HC74QDRG4Q1 is housed in a 14-pin SOIC (D) package measuring 8.70 mm × 3.90 mm, with standard 1.27 mm pitch and gull-wing leads. The package is RoHS-compliant, moisture sensitivity level 1, and rated for reflow up to 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR, 2CLR | Asynchronous Clear Input (active low) | Forces Q = LOW and Q̅ = HIGH independently per channel, overriding CLK and D |
| 1D, 2D | Data Input | Samples value on rising CLK edge; determines next-state Q output |
| 1CLK, 2CLK | Clock Input (positive edge) | Triggers state update only on rising transition; insensitive to pulse width or fall time |
| 1PRE, 2PRE | Asynchronous Preset Input (active low) | Forces Q = HIGH and Q̅ = LOW independently per channel, overriding CLK and D |
| 1Q, 2Q | True Output | Reflects stored D value after CLK↑; drives downstream logic or indicators |
| 1Q̅, 2Q̅ | Inverted Output | Complementary to Q; enables direct implementation of toggle or JK-like behavior |
| GND (Pin 7) | Ground Reference | Return path for all I/O and supply currents; must be low-impedance for noise immunity |
| VCC (Pin 14) | Positive Supply | Primary power rail; requires local 0.1 µF bypass capacitor per device |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use from –40°C to +125°C ambient, including temperature cycling and humidity testing |
| Independent asynchronous controls | Each flip-flop has dedicated PRE and CLR pins-no shared reset bus required for fault-isolated operation |
| CMOS push-pull outputs | Deliver rail-to-rail swing with matched rise/fall times (6–19 ns), reducing signal distortion in timing-critical paths |
| Input clamp diodes | Enable robustness against transient overvoltage (±20 mA clamp current) without external protection components |
| Low dynamic power | Typical ICC = 8 µA at 6 V/25°C - extends battery life in always-on vehicle modules |
Applications
| Body Control Module Toggle Switch | Engine Control Unit Clock Divider |
|---|---|
Use Scenario: Replacing mechanical toggle switches with compact momentary push buttons in door lock/unlock circuits. IC Role / Device Role / Timing Role: SN74HC74QDRG4Q1 acts as a debounced toggle latch, converting each button press into a stable HIGH/LOW state transition on Q output. Use Value: Reduces BOM cost and PCB space vs. electromechanical switches while maintaining fail-safe operation via asynchronous clear during system reset. | Use Scenario: Deriving a 5 MHz system clock from a 10 MHz crystal oscillator in fuel injection timing logic. IC Role / Device Role / Timing Role: SN74HC74QDRG4Q1 functions as a synchronous ÷2 frequency divider, with D tied to Q̅ and CLK driven by master oscillator. Use Value: Achieves precise 50% duty cycle output with <59 ns propagation skew, eliminating jitter accumulation in multi-stage timing chains. |
| ADAS Camera Power Sequencer | Infotainment System Debounce Logic |
Use Scenario: Controlling power-up sequence of image sensor and ISP in rear-view camera module. IC Role / Device Role / Timing Role: SN74HC74QDRG4Q1 provides synchronized enable signals using cascaded CLK and Q outputs to enforce strict power-rail ramp timing. Use Value: Ensures compliance with sensor vendor's power sequencing spec (tSU > 25 ns, tH > 0 ns) without FPGA or MCU intervention. | Use Scenario: Debouncing rotary encoder pulses before feeding to microcontroller GPIO in climate control panel. IC Role / Device Role / Timing Role: SN74HC74QDRG4Q1 captures clean edge transitions using PRE/CLR to force known states during encoder index pulse detection. Use Value: Eliminates firmware-based debounce overhead and prevents missed counts during rapid knob rotation (≥20 RPM). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHC74QDRG4Q1 | Faster propagation (≤7.5 ns at 5 V), higher drive (±8 mA), but narrower VCC range (2–5.5 V) | Better suited for high-speed digital interfaces where timing margin is critical; less tolerant of 6 V supply rails | Select when operating at 3.3 V with sub-10 ns timing budgets; avoid if 5 V or 6 V supply is used |
| MC74HC74ADTR2G | Identical logic function and pinout; different packaging (TSSOP-14), slightly higher RθJA (151.7°C/W vs. 133.6°C/W) | Same functional replacement but requires layout revision due to smaller footprint and different thermal profile | Choose for space-constrained designs where TSSOP-14 is preferred; verify thermal derating in sealed enclosures |
Compared with SN74HC74QDRG4Q1, SN74AHC74QDRG4Q1 trades supply voltage flexibility for speed, while MC74HC74ADTR2G maintains identical electrical behavior but shifts thermal management responsibility to PCB layout-neither offers pin-compatible drop-in replacement without validation.
Availability
SN74HC74QDRG4Q1 is available at Aetrix Electronics and suitable for automotive body control, engine management, ADAS camera sequencing, and infotainment subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HC74QDRG4Q1 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-grade logic solutions with over 50 years of automotive qualification experience.
The SN74HC74QDRG4Q1 belongs to TI's automotive HC logic family, designed specifically for reliable, low-power sequential logic in harsh-temperature vehicle subsystems where deterministic timing and AEC-Q100 compliance are mandatory.
FAQ
What is the maximum clock frequency supported by the SN74HC74QDRG4Q1 at 5 V?
The SN74HC74QDRG4Q1 supports a maximum clock frequency of 31 MHz at 5 V, as specified in the Timing Characteristics table under Recommended Operating Conditions. This value is guaranteed across the full –40°C to +125°C temperature range and accounts for worst-case propagation delay (tpd ≤ 69 ns) and minimum pulse width (tw ≥ 20 ns). The SN74HC74QDRG4Q1 achieves this performance using optimized CMOS process technology while maintaining low power consumption.
Does the SN74HC74QDRG4Q1 require external pull-up resistors on PRE and CLR inputs?
No, the SN74HC74QDRG4Q1 does not require external pull-up resistors on PRE and CLR inputs when actively driven, as these are standard CMOS inputs with negligible DC leakage (<±1000 nA at 6 V). However, if left unused, they must be terminated to VCC or GND to prevent floating states; a 10-kΩ resistor is commonly used for default HIGH or LOW biasing. Internal clamp diodes provide ESD protection but do not replace proper DC termination.
Can the SN74HC74QDRG4Q1 operate reliably at 2.5 V supply voltage?
Yes, the SN74HC74QDRG4Q1 is fully specified to operate at 2.5 V supply voltage, with guaranteed functionality across –40°C to +125°C. At 2.5 V, its maximum clock frequency is 6 MHz, setup time is 150 ns, and propagation delay is up to 345 ns. All electrical characteristics-including VOH ≥ 2.3 V and VOL ≤ 0.1 V-are validated at this voltage, making it suitable for mixed-voltage automotive domains such as low-power sensor interfaces.
How does the SN74HC74QDRG4Q1 handle simultaneous assertion of PRE and CLR?
When both PRE and CLR are asserted low simultaneously on the same channel of the SN74HC74QDRG4Q1, the output enters a defined nonstable state where Q = Q̅ = HIGH, as documented in the Function Table. This condition is not latched and resolves to a valid Q/Q̅ complementary pair upon release of either PRE or CLR. The device does not latch or retain this state-designers must avoid concurrent assertion in production logic to ensure predictable behavior.
Is the SN74HC74QDRG4Q1 pin-compatible with the commercial-grade SN74HC74DR?
Yes, the SN74HC74QDRG4Q1 is pin-compatible with the commercial-grade SN74HC74DR, sharing identical SOIC-14 pinout, terminal functions, and logic behavior. However, SN74HC74QDRG4Q1 adds AEC-Q100 Grade 1 qualification, enhanced ESD ratings (HBM ±2000 V), and extended temperature validation (–40°C to +125°C), making it suitable for automotive deployment where the commercial part is not qualified. No PCB changes are required for drop-in replacement in existing layouts.
SN74HC74QDRG4Q1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 60 MHz
- Max Propagation Delay @ V, Max CL:
- 30ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74HC74QDRG4Q1 FAQ
1.How can I place an order for SN74HC74QDRG4Q1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC74QDRG4Q1 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 SN74HC74QDRG4Q1 reliable?
The price and inventory of SN74HC74QDRG4Q1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC74QDRG4Q1 is usually 5 days.
3.What payment methods are accepted for SN74HC74QDRG4Q1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC74QDRG4Q1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC74QDRG4Q1?
SN74HC74QDRG4Q1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC74QDRG4Q1 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 SN74HC74QDRG4Q1?
For technical support, including SN74HC74QDRG4Q1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC74QDRG4Q1 requirements.
6.How does Aetrix verify that SN74HC74QDRG4Q1 is sourced from the original manufacturer or authorized distributors?
All SN74HC74QDRG4Q1 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 SN74HC74QDRG4Q1 meets industry standards.
7.What is the process for return or replacement of SN74HC74QDRG4Q1?
All SN74HC74QDRG4Q1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC74QDRG4Q1, 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 SN74HC74QDRG4Q1 part is unused and in its original packaging.
Return procedure for SN74HC74QDRG4Q1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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