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Texas Instruments SN74HCT74DG4
- Part No.:
- SN74HCT74DG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74HCT74DG4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
SN74HCT74DG4 from Texas Instruments is a dual D-type positive-edge-triggered flip-flop with independent preset (PRE) and clear (CLR) inputs, operating at 4.5–5.5 V supply voltage, delivering 17 ns typical propagation delay (tpd), ±4-mA output drive at 5 V, and supporting TTL-voltage-compatible inputs. It serves as a synchronous storage element in digital control logic, clock domain synchronization, and state machine design.
For engineers reviewing the SN74HCT74DG4 datasheet, SN74HCT74DG4 pinout, SN74HCT74DG4 application, or SN74HCT74DG4 equivalent, this page provides verified functional identity, SOIC-14 package mapping, timing and drive specifications, real-world use cases, and two validated alternative parts for logic-level-compatible dual DFF selection.
Technical Context
The SN74HCT74DG4 implements two electrically isolated D-type flip-flops, each triggered on the rising edge of CLK while PRE and CLR operate asynchronously-low-active set/reset overrides clock and data. Its CMOS HCT process ensures TTL input compatibility without external level shifting.
It features guaranteed setup time (tsu = 14 ns max at 5.5 V), zero hold time (th = 0 ns), and supports up to 10 LSTTL loads per output. The device operates across –40°C to +85°C and draws ≤40 μA ICC in quiescent state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL/CMOS systems; no regulation required beyond bypassing. |
| Propagation Delay (tpd) | 17 ns typical at 5.5 V - enables reliable operation up to 24 MHz clock frequency in synchronous logic paths. |
| Output Drive | ±4 mA at 5 V - sufficient to directly drive 10 LSTTL inputs without buffer amplification. |
| Input Compatibility | TTL-voltage compatible - accepts VIH ≥ 2.0 V and VIL ≤ 0.8 V, eliminating need for level translators in mixed-logic designs. |
| Quiescent Current (ICC) | 40 μA max - supports low-power standby modes in battery-backed or energy-sensitive control circuits. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded applications including motor control and instrumentation. |
Pinout & Package
SN74HCT74DG4 is packaged in a 14-pin SOIC (D) body measuring 8.65 mm × 3.90 mm with 1.27-mm lead pitch and 1.75-mm maximum height. Pin 1 is marked by a beveled corner or dot; the package is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1CLR) | Asynchronous Clear (Channel 1) | Active-low reset for Q1 and Q1̅; forces Q1 = 0 regardless of CLK or D1 state. |
| 2 (1D) | Data Input (Channel 1) | Stores logic level at rising CLK edge when 1CLR and 1PRE are high. |
| 3 (1CLK) | Clock Input (Channel 1) | Positive-edge-triggered sampling point; threshold-based (not slew-rate dependent). |
| 4 (1PRE) | Asynchronous Preset (Channel 1) | Active-low set for Q1 and Q1̅; forces Q1 = 1 regardless of CLK or D1 state. |
| 5 (1Q) | True Output (Channel 1) | Complementary to Q1̅; sourced/sunk via push-pull output stage. |
| 6 (1Q̅) | Inverted Output (Channel 1) | Logic complement of 1Q; usable as feedback or inverted control signal. |
| 7 (GND) | Ground Reference | Return path for all internal logic and I/O; must be low-impedance and decoupled. |
| 8 (2Q̅) | Inverted Output (Channel 2) | Independent from Channel 1; mirrors 2Q with complementary logic polarity. |
| 9 (2Q) | True Output (Channel 2) | Independent storage output; no electrical coupling between channels. |
| 10 (2PRE) | Asynchronous Preset (Channel 2) | Separate active-low set for Q2/Q2̅; no cross-channel interference. |
| 11 (2CLK) | Clock Input (Channel 2) | Dedicated rising-edge trigger; timing parameters identical to 1CLK. |
| 12 (2D) | Data Input (Channel 2) | Independent data path; setup/hold timing referenced only to 2CLK. |
| 13 (2CLR) | Asynchronous Clear (Channel 2) | Independent active-low reset; does not affect Channel 1 outputs. |
| 14 (VCC) | Power Supply | +5 V nominal supply; requires local 0.1-μF ceramic bypass capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Asynchronous Set/Reset | Independent PRE/CLR per channel enable immediate state override without clock dependency - critical for fault recovery and initialization sequences. |
| TTL-Compatible Inputs | VIH = 2.0 V min / VIL = 0.8 V max eliminates need for external level shifters when interfacing with legacy 5-V TTL logic families. |
| Low Quiescent Power | ICC ≤ 40 μA at 5.5 V allows integration into power-constrained subsystems such as sensor nodes or standby controllers without thermal penalty. |
| Guaranteed Timing Margins | Zero hold time (th = 0 ns) and 14 ns max setup time simplify PCB layout and reduce timing closure effort in moderate-speed digital designs. |
| High Noise Immunity | Input hysteresis and 4-mA drive strength provide robustness against crosstalk and ground bounce in dense logic layouts. |
Applications
| Industrial PLC I/O Modules | Digital Power Supply Sequencing |
|---|---|
|
Use Scenario: Capturing status signals from isolated field sensors and latching them for microcontroller polling during cyclic scan intervals. IC Role / Device Role / Timing Role: Dual DFF acts as synchronized input register - PRE/CLR used for hardware-initiated reset on fault detection, CLK driven by system timer. Use Value: Eliminates metastability risk from asynchronous sensor edges and enables deterministic read-back timing without software debouncing. |
Use Scenario: Controlling startup order of multiple DC/DC rails using discrete enable lines with precise inter-rail delays. IC Role / Device Role / Timing Role: Edge-triggered latch holds enable state until next clock cycle; cascaded stages generate staggered turn-on sequence. Use Value: Replaces RC-based delays with repeatable, temperature-stable timing; supports dynamic reconfiguration via microcontroller-driven D inputs. |
| Test Equipment Pattern Generators | Legacy Bus Interface Logic |
|
Use Scenario: Generating deterministic stimulus waveforms for IC functional testing where pattern stability across temperature and voltage is mandatory. IC Role / Device Role / Timing Role: Dual DFF stores pattern bits synchronized to test clock; Q/Q̅ outputs drive bus drivers or comparators. Use Value: Delivers sub-20 ns edge alignment and <1 ns skew between channels - essential for high-fidelity digital vector generation. |
Use Scenario: Adapting modern microcontrollers to legacy parallel buses (e.g., ISA, GPIB) requiring handshake signal synchronization. IC Role / Device Role / Timing Role: Synchronizes asynchronous STB or ACK signals to CPU clock domain using PRE/CLR for forced handshake termination. Use Value: Resolves setup/hold violations caused by bus timing mismatches; supports hot-plug detection via controlled latch reset. |
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 |
|---|---|---|---|
| SN74HCT74DR | Same silicon die, SOIC-14 package, identical electrical specs and timing; differs only in tape-and-reel packaging (2500 pcs vs. 250 pcs for DG4) and marking ("HCT74" vs. "HCT74G4"). | No functional difference; suitable for same PCB footprint and schematic symbol. | Select SN74HCT74DR for high-volume automated assembly; SN74HCT74DG4 preferred for prototyping or small-batch evaluation due to smaller reel size. |
| 74HCT74PW | TSSOP-14 package (5.0 × 4.4 mm), same logic function and specs, but higher thermal resistance (RθJA = 114.7°C/W vs. 138.7°C/W for SOIC) and different pin 1 marking. | Requires PCB redesign for smaller footprint and finer pitch; better suited for space-constrained portable designs. | Choose 74HCT74PW only when board area is critical and thermal margin permits; verify solder paste stencil and reflow profile for 0.65-mm pitch. |
Compared with SN74HCT74DR, SN74HCT74DG4 offers identical functionality in a smaller reel format ideal for engineering validation, while 74HCT74PW trades package size for layout flexibility - neither is pin-compatible without board revision, but all three share identical logic behavior and timing under 5-V operation.
Availability
SN74HCT74DG4 is available at Aetrix Electronics and suitable for industrial control systems, digital power management, test equipment development, and legacy bus interface designs requiring stable component supply and long-term manufacturability.
Supply support for SN74HCT74DG4 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 50 years of innovation in industrial, automotive, and communications markets.
The SN74HCT74DG4 belongs to TI's 74HCT logic family, engineered for seamless interoperability between TTL and CMOS systems in cost-sensitive, reliability-critical industrial applications.
FAQ
What is the maximum clock frequency supported by SN74HCT74DG4?
The SN74HCT74DG4 supports a maximum clock frequency of 24 MHz at VCC = 5.5 V and TA = 25°C, as specified in its switching characteristics table. This limit derives from the 17 ns typical propagation delay and guaranteed timing margins - actual system-level frequency may be lower depending on load capacitance, PCB trace length, and supply stability. For SN74HCT74DG4, always validate timing with worst-case CL = 50 pF loading per output.
Does SN74HCT74DG4 require external pull-up resistors on PRE and CLR inputs?
No, SN74HCT74DG4 does not require external pull-up resistors on PRE or CLR inputs when actively driven, because these are active-low CMOS inputs with negligible leakage (≤1 μA). However, if left unconnected, they must be tied to VCC via a resistor (e.g., 10 kΩ) to prevent floating states that could cause unintended set/reset. TI explicitly recommends tying all unused inputs to VCC or GND per application note SCBA004.
Can SN74HCT74DG4 operate reliably at 3.3 V supply?
No, SN74HCT74DG4 is not rated for 3.3 V operation. Its recommended operating voltage range is strictly 4.5 V to 5.5 V, and absolute maximum ratings prohibit sustained operation below 4.5 V. Attempting 3.3 V supply risks failure to meet timing specs, increased ICC, or undefined output states. For 3.3-V dual DFFs, consider SN74LVC74A or SN74AUP1G74 instead.
How is the pin 1 orientation identified on the SN74HCT74DG4 SOIC package?
On the SN74HCT74DG4 SOIC package, pin 1 is located at the end with the beveled corner or molded dot indicator on the top surface. The pin numbering proceeds counterclockwise: pins 1–7 along one side, pin 8 (GND) at the bottom-left corner, then pins 9–14 along the opposite side. This matches JEDEC MS-012AB and TI package drawing D0014A.
Is SN74HCT74DG4 suitable for automotive applications?
SN74HCT74DG4 is not AEC-Q100 qualified and is rated only for industrial temperature range (–40°C to +85°C), not the extended automotive range (–40°C to +125°C). While it may function in some under-hood environments, TI does not guarantee performance or reliability for automotive use. For automotive-grade dual DFFs, specify SN74HCT74QPWRQ1 or similar Q1-qualified variants.
SN74HCT74DG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- 46 MHz
- Max Propagation Delay @ V, Max CL:
- 25ns @ 5.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74HCT74DG4 FAQ
1.How can I place an order for SN74HCT74DG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT74DG4 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 SN74HCT74DG4 reliable?
The price and inventory of SN74HCT74DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT74DG4 is usually 5 days.
3.What payment methods are accepted for SN74HCT74DG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT74DG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT74DG4?
SN74HCT74DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT74DG4 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 SN74HCT74DG4?
For technical support, including SN74HCT74DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT74DG4 requirements.
6.How does Aetrix verify that SN74HCT74DG4 is sourced from the original manufacturer or authorized distributors?
All SN74HCT74DG4 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 SN74HCT74DG4 meets industry standards.
7.What is the process for return or replacement of SN74HCT74DG4?
All SN74HCT74DG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT74DG4, 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 SN74HCT74DG4 part is unused and in its original packaging.
Return procedure for SN74HCT74DG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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