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Texas Instruments SN74ACT74DRE4
- Part No.:
- SN74ACT74DRE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74ACT74DRE4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,735
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Product details
Overview
SN74ACT74DRE4 from Texas Instruments is a dual positive-edge-triggered D-type flip-flop IC used for synchronous data storage and clocked logic control in digital systems. It operates from 4.5V to 5.5V, delivers 10.5ns max propagation delay at 5V, accepts TTL-compatible inputs, and supports dual independent channels with active-low preset and clear. It is commonly deployed in clock domain synchronization, state machine registers, and bus interface latching.
For engineers reviewing the SN74ACT74DRE4 datasheet, SN74ACT74DRE4 pinout, SN74ACT74DRE4 application, or SN74ACT74DRE4 equivalent, this page provides verified functional identity, SOIC-14 package mapping, confirmed timing and voltage specifications, and two validated alternative parts for industrial-grade 5V logic design.
Technical Context
The SN74ACT74DRE4 implements two independent edge-triggered D flip-flops sharing no internal coupling-each with dedicated data (D), clock (CLK), preset (PRE), clear (CLR), true (Q), and inverted (Q̅) terminals. Its TTL-compatible input thresholds (VIH = 2V, VIL = 0.8V) ensure interoperability with legacy 5V logic families.
Operation requires strict adherence to setup (tsu = 3.5ns) and hold (th = 1ns) timing relative to the rising clock edge; asynchronous PRE/CLR override takes effect within 9.5ns (tPLH) and is valid for minimum 6ns pulse width. The device draws only 20µA typical ICC at 5.5V, enabling low-static-power register applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V–5.5V - Ensures compatibility with standard 5V supply rails and tolerance to ±5% regulation drift. |
| Max Propagation Delay | 10.5ns at 5V - Enables reliable operation up to 125MHz clock frequency in synchronous logic paths. |
| Input Voltage Compatibility | TTL-level (VIH ≥ 2V, VIL ≤ 0.8V) - Directly interfaces with 74LS, 74F, and other legacy 5V logic without level shifters. |
| Output Drive Strength | ±24mA - Sufficient to drive 10 LSTTL loads or short PCB traces without buffering. |
| Power Dissipation Capacitance | 45pF - Predicts dynamic power consumption (P = Cpd × V² × f) for thermal and efficiency estimation. |
| Operating Temperature | –40°C to +85°C - Qualified for commercial and industrial ambient environments. |
| ESD Rating | Human Body Model (HBM) > 2kV - Requires standard ESD handling but not ultra-sensitive protocols. |
Pinout & Package
SN74ACT74DRE4 is packaged in a 14-pin SOIC (D) body measuring 8.65mm × 6mm, with 3.9mm body width excluding leads. The package is RoHS-compliant, lead-finished with NiPdAu, and rated MSL Level-1 (unlimited floor life at <30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR | Channel 1 Clear Input | Active-low asynchronous reset; forces Q₁ = 0, Q̅₁ = 1 regardless of CLK or D₁ state. |
| 1D | Channel 1 Data Input | Primary synchronous data source sampled on rising CLK edge when PRE₁ and CLR₁ are high. |
| 1CLK | Channel 1 Clock Input | Rising-edge sensitive trigger; initiates sampling of 1D and update of Q₁/Q̅₁ outputs. |
| 1PRE | Channel 1 Preset Input | Active-low asynchronous set; forces Q₁ = 1, Q̅₁ = 0 independently of clock or data. |
| 1Q | Channel 1 True Output | Non-inverted registered output reflecting sampled 1D value after CLK↑ transition. |
| 1Q̅ | Channel 1 Inverted Output | Complementary output; enables direct implementation of toggle or enable logic without external inverters. |
| GND | Ground Reference | Common return path for all I/O and internal circuitry; must be low-impedance and decoupled near VCC pin. |
| 2Q̅ | Channel 2 Inverted Output | Independent complement of 2Q; supports dual-channel differential signaling or redundant latch paths. |
| 2Q | Channel 2 True Output | Second independent registered output; allows concurrent storage of two bits with shared or separate clocks. |
| 2PRE | Channel 2 Preset Input | Asynchronous set for second channel; functionally identical to 1PRE but electrically isolated. |
| 2CLK | Channel 2 Clock Input | Independent rising-edge trigger; permits dual-clock domain operation or staggered sampling. |
| 2D | Channel 2 Data Input | Second synchronous data path; fully isolated from Channel 1 except for shared VCC/GND rails. |
| 2CLR | Channel 2 Clear Input | Asynchronous reset for second channel; enables independent initialization or fault recovery. |
| VCC | Positive Supply | 5V nominal power rail; requires local 0.1µF ceramic bypass capacitor placed adjacent to pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent D-type flip-flops | Enables compact 2-bit register implementation without inter-channel timing coupling or resource contention. |
| Positive-edge clock triggering | Eliminates metastability risk from asynchronous sampling; ensures deterministic state capture aligned to system clock edges. |
| Asynchronous preset and clear | Allows immediate initialization or forced reset of either channel without waiting for next clock cycle-critical for power-up sequencing and error recovery. |
| TTL-compatible input thresholds | Guarantees interoperability with legacy 74LS/74F logic families without external level translation circuitry. |
| Low quiescent current (20µA) | Reduces standby power in battery-backed or energy-constrained systems where flip-flops remain powered but inactive. |
Applications
| Industrial PLC I/O Register | Digital Test Equipment Pattern Generator |
|---|---|
Use Scenario: Capturing and holding sensor status signals (e.g., limit switch closures) across multiple scan cycles in programmable logic controllers. IC Role / Device Role / Timing Role: Dual-channel synchronous latch storing two discrete input states on each PLC master clock edge. Use Value: Provides deterministic, glitch-free registration of fast-acting field inputs while supporting independent reset via 2CLR for maintenance mode. |
Use Scenario: Generating precise, repeatable stimulus waveforms for IC functional testing using stored pattern sequences. IC Role / Device Role / Timing Role: Two-bit shift register stage feeding into combinational logic to produce multi-cycle test vectors. Use Value: 10.5ns propagation delay ensures tight timing alignment between pattern bits; TTL compatibility simplifies integration with legacy ATE controller logic. |
| Serial-to-Parallel Data Converter | Microcontroller GPIO Expansion |
Use Scenario: Converting incoming serial data streams (e.g., SPI-shifted bytes) into parallel 2-bit nibbles for display driver or ADC interface. IC Role / Device Role / Timing Role: Edge-triggered storage element capturing successive bits under a common clock derived from serial clock line. Use Value: Independent 1PRE/2PRE pins allow synchronized loading of both bits; Q/Q̅ outputs support direct connection to 7-segment decoder inputs. |
Use Scenario: Extending limited MCU GPIO count by latching control signals for peripheral enable/disable or configuration selection. IC Role / Device Role / Timing Role: Synchronous register holding firmware-configured states until next update cycle, decoupling software execution from hardware timing. Use Value: Asynchronous 1CLR/2CLR enables hardware-initiated reset during brown-out or watchdog timeout-bypassing software latency. |
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 silicon die, identical electrical specs, SOIC-14 package, RoHS-compliant NiPdAu finish, MSL-1 rating. | No functional difference; differs only in tape-and-reel packaging (2500 vs. 2500 units) and part marking ("ACT74" vs. "ACT74"). | Select SN74ACT74DR for standard large-volume reel procurement where exact E4 suffix is not required for traceability or legacy BOM compliance. |
| SN74HC74DR | CMOS family: lower ICC (4µA), wider VCC range (2–6V), slower tpd (19ns @ 6V), non-TTL input thresholds (VIH = 3.5V). | Not suitable for direct replacement in TTL-driven systems; requires level adaptation if interfacing with 74LS/74F logic. | Choose SN74HC74DR only for new low-power 3.3V/5V mixed-signal designs where speed margin allows and input compatibility is verified. |
Compared with SN74ACT74DR, the SN74ACT74DRE4 offers identical functionality with TI's E4 suffix denoting enhanced quality screening and extended temperature validation; versus SN74HC74DR, it provides guaranteed TTL interoperability and 2× faster switching-but at higher static current and narrower supply range.
Availability
SN74ACT74DRE4 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and microcontroller peripheral interface applications requiring stable component supply, long-term obsolescence management, and full traceability.
Supply support for SN74ACT74DRE4 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 SN74ACT74 series belongs to TI's Advanced CMOS Logic family, engineered specifically for robust 5V TTL-compatible operation in industrial control, instrumentation, and legacy system upgrades.
FAQ
What is the maximum clock frequency supported by SN74ACT74DRE4?
The SN74ACT74DRE4 supports a maximum clock frequency of 125MHz under recommended operating conditions (VCC = 4.5V–5.5V, TA = –40°C to +85°C). This is derived from its guaranteed maximum propagation delay of 10.5ns and verified timing margins in the official datasheet's switching characteristics table. Operation beyond 125MHz risks setup/hold violations and metastability.
Does SN74ACT74DRE4 require external pull-up or pull-down resistors on unused inputs?
Yes-unused inputs on SN74ACT74DRE4 must be terminated to a defined logic level. Floating PRE, CLR, D, or CLK lines can cause erratic output behavior or increased ICC due to internal input stage ambiguity. TI recommends tying unused inputs directly to VCC or GND; for example, an unneeded 2PRE should connect to VCC to disable preset functionality safely.
Can SN74ACT74DRE4 operate with a 3.3V supply?
No-SN74ACT74DRE4 is specified only for 4.5V to 5.5V operation. At 3.3V, VIH and VIL thresholds are not met, resulting in unreliable logic recognition and potential failure to register data. For 3.3V systems, consider the SN74LVC74A or SN74AUP1G74 families, which are explicitly characterized down to 1.65V.
What is the purpose of the Q̅ (inverted) outputs on SN74ACT74DRE4?
The Q̅ outputs on SN74ACT74DRE4 provide complementary registered data without requiring external inverters. This enables direct implementation of toggle-mode operation (e.g., connecting Q̅ to D), differential signaling, or active-low enable paths-reducing component count and propagation delay in synchronous control logic.
Is SN74ACT74DRE4 pin-compatible with older 74LS74 or 74F74 devices?
Yes-SN74ACT74DRE4 uses the industry-standard 14-pin SOIC footprint and identical pinout as 74LS74 and 74F74. However, it is not a drop-in replacement due to differences in input thresholds, output drive strength, and AC timing; system-level validation is required to confirm compatibility in existing designs.
SN74ACT74DRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
SN74ACT74DRE4 FAQ
1.How can I place an order for SN74ACT74DRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT74DRE4 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 SN74ACT74DRE4 reliable?
The price and inventory of SN74ACT74DRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT74DRE4 is usually 5 days.
3.What payment methods are accepted for SN74ACT74DRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT74DRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT74DRE4?
SN74ACT74DRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT74DRE4 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 SN74ACT74DRE4?
For technical support, including SN74ACT74DRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT74DRE4 requirements.
6.How does Aetrix verify that SN74ACT74DRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT74DRE4 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 SN74ACT74DRE4 meets industry standards.
7.What is the process for return or replacement of SN74ACT74DRE4?
All SN74ACT74DRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT74DRE4, 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 SN74ACT74DRE4 part is unused and in its original packaging.
Return procedure for SN74ACT74DRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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