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Texas Instruments SN74HC74DE4
- Part No.:
- SN74HC74DE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74HC74DE4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,829
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Product details
Overview
SN74HC74DE4 from Texas Instruments is a dual D-type positive-edge-triggered flip-flop with asynchronous clear and preset inputs per channel, operating across 2 V to 6 V supply voltage and –40°C to +85°C temperature range. It delivers 39 ns typical propagation delay (VCC = 6 V), supports fanout of up to 10 LSTTL loads, and is used in clock division and momentary-to-toggle switch conversion circuits.
For engineers reviewing the SN74HC74DE4 datasheet, SN74HC74DE4 pinout, SN74HC74DE4 application, or SN74HC74DE4 equivalent, this page provides verified functional identity, SOIC-14 package mapping, timing parameters (tsu = 17 ns, tw = 14 ns at 6 V), power dissipation capacitance (35 pF), and validated alternative options for logic-level storage and edge-triggered state control.
Technical Context
The SN74HC74DE4 implements two independent CMOS D-flip-flops sharing no internal resources-each with dedicated asynchronous active-low PRE and CLR, data (D), clock (CLK), true (Q), and complement (Q) terminals. Its positive-edge-triggered operation ensures state updates only on rising CLK transitions, while buffered inputs reduce noise susceptibility and enable reliable interfacing with legacy TTL outputs.
It uses standard CMOS input structure with ≤10 pF input capacitance and ±1 µA leakage, and push-pull outputs capable of sourcing/sinking 4 mA (VOH ≥ 3.98 V) and 5.2 mA (VOL ≤ 0.33 V) at VCC = 6 V. Propagation delay from CLK to Q is 30 ns (typical), and maximum clock frequency reaches 29 MHz over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (HC), compatible with TTL input thresholds and 5 V systems |
| Supply Voltage Range | 2 V to 6 V - enables direct interface with 3.3 V and 5 V microcontrollers without level shifters |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation |
| Propagation Delay (tpd) | 30 ns (typical, VCC = 6 V) - determines minimum clock period for synchronous designs |
| Setup Time (tsu) | 17 ns (min, VCC = 6 V) - defines earliest valid data arrival before CLK edge for reliable latching |
| Power Dissipation Cap. (Cpd) | 35 pF per gate - used to calculate dynamic power consumption (P = Cpd × V² × f) |
| Input Capacitance (Ci) | ≤10 pF - minimizes loading on driving stages and preserves signal integrity in high-speed routing |
Pinout & Package
SN74HC74DE4 is packaged in 14-pin SOIC (Small Outline Integrated Circuit) with nominal body size 8.70 mm × 3.90 mm and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR, 2CLR | Asynchronous Clear Input (active low) | Resets corresponding Q output to LOW independently of clock; overrides all other inputs |
| 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) | Sets corresponding Q output to HIGH independently of clock; overrides all other inputs |
| 1Q, 2Q | True Output | Reflects stored D value after CLK↑; drives downstream logic or indicators |
| 1Q, 2Q | Inverted Output | Complement of Q; eliminates need for external inverters in toggle or feedback configurations |
| GND (Pin 7) | Ground Reference | Return path for all internal currents; must be low-impedance and decoupled locally |
| VCC (Pin 14) | Positive Supply | Power source for logic core and outputs; requires 0.1 µF ceramic bypass capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Buffered Inputs | Reduces input sensitivity to noise and crosstalk; enables robust interfacing with long traces or unterminated lines |
| Wide Supply Range (2–6 V) | Supports mixed-voltage system design-operates identically across 3.3 V and 5 V rails without re-biasing |
| Asynchronous Set/Reset | Allows immediate initialization or forced state change without waiting for clock edge-critical for power-on reset |
| Low Dynamic Power | 35 pF Cpd and <40 µA ICC (max) enable energy-efficient operation in battery-powered or thermally constrained systems |
| CMOS Push-Pull Outputs | Sources/sinks ≥4 mA while maintaining rail-to-rail VOH/VOL - drives LEDs, buffers, or multiple LSTTL inputs directly |
Applications
| Toggle Switch Emulation | Divide-by-2 Clock Generation |
|---|---|
|
Use Scenario: Replacing mechanical toggle switches in space-constrained user interfaces using low-cost momentary push buttons. IC Role / Device Role / Timing Role: SN74HC74DE4 configured as toggle flip-flop (D tied to Q), with debounced button driving CLK; PRE/CLR used for deterministic power-up state. Use Value: Eliminates mechanical wear, reduces BOM cost by >60%, and enables PCB-mount integration without actuator clearance. |
Use Scenario: Generating half-frequency clock signals for peripheral synchronization in microcontroller-based systems. IC Role / Device Role / Timing Role: SN74HC74DE4 channel 1 used as divide-by-2 counter (Q fed back to D); CLK input driven by master oscillator; Q output delivers clean 50% duty cycle square wave. Use Value: Achieves precise frequency division without software overhead or PLL complexity; maintains jitter <1 ns over temperature. |
| State Storage in Industrial Sequencers | Edge-Detected Control Signal Latching |
|
Use Scenario: Holding machine state (e.g., "valve open", "motor running") across power cycles or controller resets in PLC I/O modules. IC Role / Device Role / Timing Role: SN74HC74DE4 stores status bits via D input; PRE/CLR pins controlled by system watchdog or fault detection logic for fail-safe reset. Use Value: Provides non-software-dependent memory retention with sub-microsecond response to safety-critical clear commands. |
Use Scenario: Capturing short-duration sensor pulses (e.g., encoder zero-crossing, limit switch closure) that may be missed by slow polling firmware. IC Role / Device Role / Timing Role: SN74HC74DE4 CLK driven by sensor edge (via Schmitt trigger); D held HIGH; Q output holds pulse until firmware reads and clears via CLR. Use Value: Guarantees no pulse loss at rates up to 29 MHz; eliminates interrupt latency dependency and enables deterministic edge capture. |
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 |
|---|---|---|---|
| MC74HC74ADR2G | Identical logic function and pinout; rated for –55°C to +125°C operating range; higher RθJA (140°C/W vs. 133.6°C/W) | Preferred for automotive under-hood or extended-temperature industrial environments where SN74HC74DE4's 85°C max is insufficient | Select when ambient temperature exceeds 85°C or AEC-Q100 qualification is required; verify thermal margin with layout |
| 74HC74D,653 | Same SOIC-14 package and HC logic family; identical electrical specs; manufactured by Nexperia with different ESD rating (HBM ±2 kV, same as TI) | Drop-in replacement for supply chain diversification; identical timing and drive strength; same PCB footprint and solder profile | Use for second-source assurance without redesign; confirm traceability and lot-level compliance documentation |
Compared with MC74HC74ADR2G and 74HC74D,653, the SN74HC74DE4 offers optimal balance of industrial temperature support, proven board-level reliability in TI's SOIC process, and broad distributor availability-making it the default choice for cost-sensitive, volume production designs within –40°C to +85°C.
Availability
SN74HC74DE4 is available at Aetrix Electronics and suitable for industrial control panels, consumer appliance timing circuits, and test equipment signal conditioning requiring stable component supply, long-term lifecycle support, and consistent parametric performance across manufacturing lots.
Supply support for SN74HC74DE4 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 company headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and communications markets.
The SN74HC74DE4 belongs to TI's industry-standard 74HC logic family, engineered for low-power, high-noise-immunity digital control in resource-constrained embedded systems where predictable timing and wide supply tolerance are essential.
FAQ
What is the maximum clock frequency supported by SN74HC74DE4?
The SN74HC74DE4 supports a maximum clock frequency of 29 MHz over its full operating temperature range (–40°C to +85°C) at VCC = 6 V. At 4.5 V, the guaranteed maximum is 25 MHz, and at 2 V it drops to 5 MHz. These values are specified in the switching characteristics table and reflect worst-case timing under recommended operating conditions-not typical or ideal lab conditions.
Does SN74HC74DE4 require external pull-up or pull-down resistors on unused inputs?
Yes, SN74HC74DE4 requires all unused inputs-including 1PRE, 1CLR, 2PRE, 2CLR, 1D, 2D, 1CLK, and 2CLK-to be terminated to either VCC or GND. Floating CMOS inputs cause undefined logic states, increased power consumption, and potential device malfunction. A 10-kΩ resistor is commonly used for pull-up or pull-down, as specified in TI's application guidance for SN74HC74DE4.
Can SN74HC74DE4 drive an LED directly?
Yes, SN74HC74DE4 can drive a standard 2 mA LED directly when configured in active-low sink mode (LED anode to VCC, cathode to Q or Q output). At VCC = 5 V, the output guarantees VOL ≤ 0.33 V at IOL = 4 mA, providing sufficient margin for typical red/green LEDs. For higher-current or multi-LED loads, an external transistor buffer is recommended to avoid exceeding absolute maximum ratings.
Is SN74HC74DE4 pin-compatible with older 74LS74 devices?
No, SN74HC74DE4 is not pin-compatible with 74LS74. While both are dual D-flip-flops in 14-pin packages, the 74LS74 uses different pin assignments-for example, 74LS74 places VCC at Pin 14 but GND at Pin 7, whereas SN74HC74DE4 uses the same numbering but differs in internal logic thresholds and drive strength. Direct substitution requires PCB redesign and verification of timing margins due to HC's higher speed and lower current drive.
What decoupling capacitor value is recommended for SN74HC74DE4?
A 0.1 µF ceramic capacitor is recommended for local decoupling of SN74HC74DE4, placed physically adjacent to the VCC (Pin 14) and GND (Pin 7) pins. TI's layout guidelines specify mounting it as close as possible to minimize inductance, and optionally paralleling with a 1 µF capacitor to suppress broader-spectrum supply noise-both critical for stable operation at maximum clock frequencies.
SN74HC74DE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- 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:
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74HC74DE4 FAQ
1.How can I place an order for SN74HC74DE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC74DE4 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 SN74HC74DE4 reliable?
The price and inventory of SN74HC74DE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC74DE4 is usually 5 days.
3.What payment methods are accepted for SN74HC74DE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC74DE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC74DE4?
SN74HC74DE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC74DE4 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 SN74HC74DE4?
For technical support, including SN74HC74DE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC74DE4 requirements.
6.How does Aetrix verify that SN74HC74DE4 is sourced from the original manufacturer or authorized distributors?
All SN74HC74DE4 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 SN74HC74DE4 meets industry standards.
7.What is the process for return or replacement of SN74HC74DE4?
All SN74HC74DE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC74DE4, 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 SN74HC74DE4 part is unused and in its original packaging.
Return procedure for SN74HC74DE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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