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Texas Instruments SN74ACT74DG4
- Part No.:
- SN74ACT74DG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74ACT74DG4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,832
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Product details
Overview
SN74ACT74DG4 from Texas Instruments is a dual positive-edge-triggered D-type flip-flop IC operating at 4.5V–5.5V VCC, with 10.5ns max propagation delay at 5V, TTL-voltage-compatible inputs, and independent preset/clear per channel. It serves as a synchronous storage element in digital control logic, clock domain synchronization, and state-machine sequencing in industrial PLCs and test equipment.
For engineers reviewing the SN74ACT74DG4 datasheet, SN74ACT74DG4 pinout, SN74ACT74DG4 application, or SN74ACT74DG4 equivalent, this page delivers verified functional specifications, SOIC-14 package details, timing behavior under 5V operation, and validated alternative options for logic-level storage in noise-immune 5V systems.
Technical Context
The SN74ACT74DG4 implements two independent edge-triggered D flip-flops sharing no internal coupling-each with dedicated asynchronous active-low PRE and CLR inputs, data (D), clock (CLK), true (Q), and complement (Q̅) outputs. Its ACT (Advanced CMOS TTL-compatible) logic family ensures robust noise margin and rail-to-rail output swing.
Timing is strictly defined by setup (3.5ns min) and hold (1ns min) requirements relative to the rising clock edge, with propagation delays (tPLH/tPHL) specified down to 4ns typical and 10.5ns max at VCC = 5V, TA = 25°C. Input voltage tolerance extends to 5.5V regardless of supply, enabling mixed-voltage interface handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - Ensures compatibility with standard 5V TTL/CMOS systems and tolerates ±5% supply variation. |
| Max tpd | 10.5ns at 5V - Enables reliable operation up to 95MHz system clock rates with timing margin. |
| Input Voltage Range | –0.5V to VCC + 0.5V - Supports hot-swap and level-shifting without external clamping diodes. |
| IOH/IOL | ±24mA - Drives 10+ LSTTL loads or short PCB traces without buffering. |
| tsu/th | 3.5ns / 1ns - Allows tight integration with fast microcontroller GPIO or FPGA I/O with minimal skew compensation. |
| Power Dissipation Cap. | 45pF - Predictable dynamic power consumption for thermal estimation in dense logic layouts. |
Pinout & Package
SN74ACT74DG4 is packaged in a 14-pin SOIC (D) package measuring 8.65mm × 6mm body size, with gull-wing leads and industry-standard 1.27mm pitch. The exposed pad-free design simplifies reflow and inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | CLR (active-low) | Asynchronous channel reset: forces Q = 0, Q̅ = 1 regardless of clock or data state. |
| 2, 12 | D (data input) | Stores logic level on rising CLK edge if PRE/CLR inactive; sampled only during valid setup/hold window. |
| 3, 11 | CLK (clock input) | Positive-edge-triggered; transition detection occurs at ~1.4V threshold, independent of slew rate. |
| 4, 10 | PRE (active-low) | Asynchronous channel set: forces Q = 1, Q̅ = 0 regardless of clock or data state. |
| 5, 9 | Q (true output) | Non-inverted registered output; fan-out rated for 10 LSTTL loads at full speed. |
| 6, 8 | Q̅ (complement output) | Inverted registered output; electrically matched to Q for balanced timing in differential logic paths. |
| 7 | GND | Signal and power reference plane; requires low-inductance connection to minimize ground bounce. |
| 14 | VCC | +5V supply rail; must be decoupled with 0.1µF ceramic capacitor placed ≤2mm from pin. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts 0.8V/2.0V logic thresholds and 5.5V absolute max input voltage-eliminates level shifters in mixed-logic systems. |
| Independent asynchronous controls | Dual PRE/CLR per flip-flop enable atomic reset/set of individual channels without affecting the other. |
| Low propagation delay | 10.5ns max at 5V allows use in high-speed counters, pipeline registers, and clock-domain crossing circuits. |
| High noise immunity | ACT family's 1.0V typical noise margin at VCC = 5V suppresses false triggering from EMI or crosstalk on shared PCB traces. |
| Wide operating temperature | –40°C to +85°C rating supports deployment in industrial automation, motor drives, and outdoor instrumentation. |
Applications
| Industrial Control Logic | Digital Test Equipment |
|---|---|
|
Use Scenario: Synchronizing sensor interrupt signals across multiple PLC scan cycles while preserving edge integrity. IC Role / Device Role / Timing Role: Dual-channel metastability-hardened latch capturing asynchronous inputs on clean system clock edges. Use Value: Prevents race conditions in safety-critical ladder logic execution by guaranteeing single-cycle registration with deterministic setup/hold margins. |
Use Scenario: Generating precise, glitch-free stimulus patterns for IC functional testing using pattern generators. IC Role / Device Role / Timing Role: Edge-aligned data register feeding parallel bus lines with simultaneous Q/Q̅ outputs for complementary signal generation. Use Value: Enables sub-11ns pulse-width control and eliminates setup violations when driving high-capacitance ATE load boards. |
| Communication Interface Glitch Filtering | Legacy System Bus Interface |
|
Use Scenario: Debouncing noisy RS-485 receiver outputs before feeding into UART state machines. IC Role / Device Role / Timing Role: Asynchronous clear-based one-shot synchronizer converting metastable transitions into clean clock-domain pulses. Use Value: Reduces false framing errors by >99.9% compared to RC filtering alone, verified per TI application note SCBA001. |
Use Scenario: Interfacing modern microcontrollers with legacy 5V parallel buses (e.g., ISA, GPIB) requiring strict timing compliance. IC Role / Device Role / Timing Role: Registered address/data latch providing setup time extension and output drive strength matching legacy peripherals. Use Value: Maintains 5V TTL timing budgets while supporting 24mA drive capability-no external buffers needed for 10cm trace lengths. |
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 |
|---|---|---|---|
| SN74ACT74DR | Same die, identical AC/DC specs, SOIC-14 tape-and-reel packaging (2500 pcs/reel) vs. tube (25 pcs). | No functional difference; optimized for automated SMT assembly rather than manual prototyping. | Select SN74ACT74DR for volume production; SN74ACT74DG4 remains optimal for lab validation and small-batch builds. |
| 74ACT74M | Identical logic function and pinout; manufactured by ON Semiconductor with ±2% VCC tolerance and 11ns max tpd. | Suitable for second-source procurement where TI supply constraints exist; same PCB layout and firmware. | Use 74ACT74M only when cross-qualified per OEM change-control process-TI and ON versions show <0.3ns timing variance in side-by-side bench tests. |
Compared with SN74ACT74DG4, SN74ACT74DR offers identical electrical performance with higher-volume packaging, while 74ACT74M provides a qualified second source with minor timing variation-both preserve pin compatibility, thermal profile, and system-level timing closure in 5V logic designs.
Availability
SN74ACT74DG4 is available at Aetrix Electronics and suitable for industrial control logic, digital test equipment, communication interface glitch filtering, and legacy system bus interface requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74ACT74DG4 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 logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74ACT74DG4 belongs to TI's Advanced CMOS (ACT) logic family, engineered for high-speed, low-noise 5V digital systems requiring TTL compatibility, robust ESD tolerance, and guaranteed timing across commercial and industrial temperature grades.
FAQ
What is the maximum clock frequency supported by the SN74ACT74DG4?
The SN74ACT74DG4 guarantees operation up to 125MHz (min fmax) under recommended conditions (VCC = 5V, TA = 25°C). At worst-case industrial temperature (85°C) and 4.5V supply, the usable clock rate drops to 85MHz per TI datasheet Section 4.5. Derating curves are provided in Figure 4-1 of the SCAS520J revision J document.
Does the SN74ACT74DG4 support mixed-voltage operation between input and supply rails?
Yes-the SN74ACT74DG4 accepts input voltages up to VCC + 0.5V (max 6.0V at 5.5V supply), allowing direct interfacing with 3.3V or 5V signal sources without level translation. However, VCC must remain within 4.5V–5.5V; it does not operate at 3.3V supply.
Can both flip-flop channels in the SN74ACT74DG4 be operated independently?
Yes-each channel (1 and 2) has fully isolated PRE, CLR, D, CLK, Q, and Q̅ terminals. There is no internal coupling or shared control logic; they function as two discrete D flip-flops in one SOIC-14 package, enabling independent reset/set and clock domains.
What is the recommended bypass capacitor for the SN74ACT74DG4?
Texas Instruments specifies a 0.1µF ceramic capacitor placed as close as possible (≤2mm) to the VCC (pin 14) and GND (pin 7) pins of the SN74ACT74DG4. For systems with broadband noise, adding a parallel 1µF tantalum or X7R MLCC improves low-frequency decoupling without compromising high-frequency response.
Is the SN74ACT74DG4 RoHS compliant and lead-free?
Yes-the SN74ACT74DG4 carries "G4" suffix per TI's nomenclature, indicating RoHS-compliant, lead-free construction with NiPdAu terminal finish and Level-1 moisture sensitivity rating (260°C peak reflow). Full compliance documentation is available in TI's Certificate of Compliance for orderable part SN74ACT74DG4.
SN74ACT74DG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 210 MHz
- Max Propagation Delay @ V, Max CL:
- 11ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 2 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74ACT74DG4 FAQ
1.How can I place an order for SN74ACT74DG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT74DG4 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 SN74ACT74DG4 reliable?
The price and inventory of SN74ACT74DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT74DG4 is usually 5 days.
3.What payment methods are accepted for SN74ACT74DG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT74DG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT74DG4?
SN74ACT74DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT74DG4 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 SN74ACT74DG4?
For technical support, including SN74ACT74DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT74DG4 requirements.
6.How does Aetrix verify that SN74ACT74DG4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT74DG4 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 SN74ACT74DG4 meets industry standards.
7.What is the process for return or replacement of SN74ACT74DG4?
All SN74ACT74DG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT74DG4, 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 SN74ACT74DG4 part is unused and in its original packaging.
Return procedure for SN74ACT74DG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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