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Texas Instruments SN74AC74DE4
- Part No.:
- SN74AC74DE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AC74DE4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
SN74AC74DE4 from Texas Instruments is a dual positive-edge-triggered D-type flip-flop IC with independent asynchronous clear (CLR) and preset (PRE) inputs per channel, 2V–6V supply operation, <10ns propagation delay at 5V, and complementary Q/Q̅ outputs. It serves as a synchronous storage element in digital logic systems for clock division, toggle switching, and state retention in industrial control and instrumentation.
For engineers reviewing the SN74AC74DE4 datasheet, SN74AC74DE4 pinout, SN74AC74DE4 application, or SN74AC74DE4 equivalent, key selection criteria include VCC range compatibility (2–6V), edge-triggered timing behavior, dual-channel independence, and TSSOP-14 package footprint constraints.
Technical Context
The SN74AC74DE4 implements two fully independent CMOS D-type flip-flops, each with separate active-low asynchronous PRE and CLR inputs and complementary outputs. Its positive-edge clock triggering ensures deterministic state capture synchronized to rising CLK transitions.
It uses balanced push-pull CMOS outputs capable of sourcing/sinking ±24 mA at 4.5V, supports input voltages up to 6V regardless of VCC, and maintains stable operation across −40°C to +85°C ambient temperature - meeting industrial-grade reliability requirements without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - enables direct interface with 3.3V and 5V logic families without voltage translation. |
| Max tpd | 10ns at 5V - supports clock frequencies up to 125MHz (typical), suitable for high-speed digital control loops. |
| Input Voltage Tolerance | Up to 6V - allows mixed-voltage system interfacing where input signals exceed VCC (e.g., 5V signals into 3.3V-powered device). |
| Output Drive | ±24 mA at 4.5V - sufficient to drive multiple standard CMOS loads or one TTL input without buffering. |
| Operating Temperature | −40°C to +85°C - qualified for industrial environments including factory automation and motor control. |
| Power Dissipation Cap. | 45 pF (Cpd) - enables accurate dynamic power estimation in battery-sensitive or thermally constrained designs. |
Pinout & Package
SN74AC74DE4 is packaged in a 14-pin TSSOP (PW) with 5mm × 6.4mm outline and 0.65mm lead pitch. The exposed pad variant is not used in this orderable part.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | Channel 1/2 Clear (CLR) | Active-low asynchronous reset - forces Q = LOW, Q̅ = HIGH independent of clock. |
| 2, 12 | Channel 1/2 Data (D) | Primary data input sampled on CLK↑ - determines next-state output value. |
| 3, 11 | Channel 1/2 Clock (CLK) | Positive-edge-triggered sampling input - captures D value only at rising transition. |
| 4, 10 | Channel 1/2 Preset (PRE) | Active-low asynchronous set - forces Q = HIGH, Q̅ = LOW independent of clock. |
| 5, 9 | Channel 1/2 Output (Q) | Non-inverted registered output - reflects D value after CLK↑, subject to PRE/CLR priority. |
| 6, 8 | Channel 1/2 Inverted Output (Q̅) | Complementary registered output - always opposite Q state when enabled. |
| 7 | GND | Ground reference for all internal circuitry and I/O - must be low-impedance connection. |
| 14 | VCC | Positive supply rail - powers internal logic and output drivers; requires local 0.1µF bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent flip-flops | Enables compact implementation of two separate synchronous storage functions in one 14-pin package - reduces board area vs. discrete solutions. |
| Asynchronous PRE/CLR per channel | Allows immediate state initialization or forced reset without waiting for clock edge - critical for power-on sequencing and fault recovery. |
| 2V–6V wide VCC range | Supports interoperability across legacy 5V, modern 3.3V, and mixed-supply systems without level shifters or voltage regulators. |
| CMOS push-pull outputs | Provides symmetrical sourcing/sinking capability (±24 mA) - eliminates need for external pull-ups in wired-OR or bus-driving applications. |
| Input tolerance to 6V | Permits direct connection of higher-voltage control signals (e.g., 5V microcontroller GPIO) to 3.3V-powered SN74AC74DE4 - simplifies interconnect design. |
Applications
| Industrial Toggle Switch Interface | Digital Clock Division |
|---|---|
Use Scenario: Replacing mechanical toggle switches with momentary pushbuttons in HMI panels or PLC I/O modules to reduce wear and cost. IC Role / Device Role / Timing Role: SN74AC74DE4 configured as a toggle flip-flop (D tied to Q̅) converts debounced button presses into clean, synchronized output toggles on each CLK↑. Use Value: Eliminates mechanical switch bounce issues while maintaining deterministic edge-aligned output transitions - improves system reliability and reduces firmware debounce overhead. | Use Scenario: Generating sub-harmonic clocks for microcontroller peripherals or ADC sampling in embedded measurement systems. IC Role / Device Role / Timing Role: SN74AC74DE4 used in cascaded configuration (Q1→CLK2) divides an input clock by 2 or 4 with precise duty-cycle preservation. Use Value: Provides jitter-free frequency division using only one IC - avoids phase drift and setup/hold violations common in software-based dividers. |
| State Retention in Control Logic | Power-On Reset Synchronization |
Use Scenario: Holding operational mode or calibration state across brief power interruptions in motor drives or sensor nodes. IC Role / Device Role / Timing Role: SN74AC74DE4 stores critical control bits (e.g., enable/disable flags) synchronized to system clock edges - retains state as long as VCC remains within 2–6V. Use Value: Delivers deterministic, glitch-free state holding without external latches or nonvolatile memory - reduces BOM count and firmware complexity. | Use Scenario: Ensuring consistent initial output state (e.g., LOW) after power-up in safety-critical sequencers or relay drivers. IC Role / Device Role / Timing Role: SN74AC74DE4's asynchronous CLR input is driven by RC-based power-on reset circuit to force Q = LOW before first clock edge. Use Value: Guarantees known startup condition without requiring processor intervention - meets functional safety requirements for predictable boot behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC74APWRE4 | Lower VCC range (1.65–5.5V); 3.3V-optimized; 5.5ns tpd at 3.3V | Better suited for 3.3V-only systems with tighter timing budgets; not 5V-tolerant on inputs | Select when operating exclusively at 3.3V and requiring lower propagation delay. |
| MC74AC74DG | SOIC-14 package; identical AC electrical specs; ON Semiconductor second-source | Same functionality and timing but different package footprint and manufacturer qualification | Select when SOIC-14 mounting or ON Semi supply chain alignment is required. |
Compared with SN74AC74DE4, SN74LVC74APWRE4 offers faster speed at 3.3V but sacrifices 5V input tolerance and wide-VCC flexibility, while MC74AC74DG provides identical performance in SOIC-14 - making SN74AC74DE4 optimal for mixed-voltage TSSOP designs requiring robustness and interoperability.
Availability
SN74AC74DE4 is available at Aetrix Electronics and suitable for industrial control, instrumentation, and embedded logic applications requiring stable component supply, long-term manufacturability, and guaranteed traceability.
Supply support for SN74AC74DE4 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 high-reliability digital ICs.
The SNx4AC74 family was designed for general-purpose synchronous logic applications demanding wide supply range, robust noise immunity, and industrial temperature operation - targeting control, interface, and signal conditioning subsystems.
FAQ
What is the maximum clock frequency supported by the SN74AC74DE4?
The SN74AC74DE4 supports up to 125 MHz typical clock frequency at VCC = 5 V, based on its 10 ns maximum propagation delay (tpd). At 3.3 V, the maximum usable frequency drops to 95 MHz due to slower switching characteristics - both values are specified under recommended operating conditions and assume proper load and layout practices.
Does the SN74AC74DE4 require external pull-up or pull-down resistors on unused inputs?
Yes, all unused inputs of the SN74AC74DE4 must be terminated to either VCC or GND to prevent floating states that cause excessive current draw, oscillation, or undefined output behavior. A 10 kΩ resistor is recommended for pull-up/pull-down if the input may be left un-driven during certain modes - direct connection is acceptable for permanently fixed inputs.
Can the SN74AC74DE4 operate with a 3.3V supply while accepting 5V input signals?
Yes, the SN74AC74DE4 supports input voltages up to 6V regardless of VCC level, so it can safely accept 5V logic signals while powered from a 3.3V supply. This eliminates the need for external level translators in mixed-voltage systems - a key advantage over LVC-series alternatives.
What is the function of the Q̅ (inverted output) pins on the SN74AC74DE4?
The Q̅ pins on the SN74AC74DE4 provide true complementary outputs for each flip-flop channel - they always reflect the logical inverse of the corresponding Q output (except during PRE/CLR assertion). This enables direct implementation of toggle configurations (D = Q̅), differential signaling, or dual-rail logic without external inverters.
Is the SN74AC74DE4 pin-compatible with other members of the SN74AC74 family?
Yes, the SN74AC74DE4 shares identical pinout and functionality with all SN74AC74 variants in TSSOP-14 (PW) packaging, including SN74AC74DR and SN74AC74PWR. Differences exist only in tape-and-reel packaging, moisture sensitivity level, and shipping quantity - electrical and mechanical compatibility is maintained across these orderable versions.
SN74AC74DE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- 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:
- 160 MHz
- Max Propagation Delay @ V, Max CL:
- 10ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- 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
SN74AC74DE4 FAQ
1.How can I place an order for SN74AC74DE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC74DE4 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 SN74AC74DE4 reliable?
The price and inventory of SN74AC74DE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC74DE4 is usually 5 days.
3.What payment methods are accepted for SN74AC74DE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC74DE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC74DE4?
SN74AC74DE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC74DE4 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 SN74AC74DE4?
For technical support, including SN74AC74DE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC74DE4 requirements.
6.How does Aetrix verify that SN74AC74DE4 is sourced from the original manufacturer or authorized distributors?
All SN74AC74DE4 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 SN74AC74DE4 meets industry standards.
7.What is the process for return or replacement of SN74AC74DE4?
All SN74AC74DE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC74DE4, 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 SN74AC74DE4 part is unused and in its original packaging.
Return procedure for SN74AC74DE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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