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Texas Instruments SN74ACT74NG4
- Part No.:
- SN74ACT74NG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ACT74NG4.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,791
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Product details
Overview
SN74ACT74NG4 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, features TTL-voltage-compatible inputs, and supports independent preset and clear on each channel. It is commonly deployed in clock domain synchronization, state machine registers, and bus interface latching.
For engineers reviewing the SN74ACT74NG4 datasheet, SN74ACT74NG4 pinout, SN74ACT74NG4 application, or SN74ACT74NG4 equivalent, key selection criteria include its 14-pin PDIP package, dual-channel edge-triggered behavior, guaranteed 85MHz maximum clock frequency, low-power ACT logic family performance, and compatibility with 5V TTL/CMOS signal environments.
Technical Context
The SN74ACT74NG4 implements two independent D-type flip-flops, each with asynchronous active-low preset (PRE) and clear (CLR), synchronous positive-edge clock (CLK), and complementary Q/Q̅ outputs. Its ACT logic family ensures fast switching, high noise immunity, and rail-to-rail output swing under 5V operation.
Each flip-flop transfers data from D to Q on the rising edge of CLK when both PRE and CLR are high; low assertion of PRE or CLR forces immediate Q = H or Q = L respectively, overriding clock and data. Input voltage tolerance up to 5.5V enables interfacing with higher-voltage legacy logic without level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V–5.5V - Ensures robust operation across industrial 5V supply tolerances and brown-out resilience. |
| Max tpd | 10.5ns at 5V - Enables reliable timing in high-speed 85MHz clock domains with margin for trace delays. |
| fmax | 85MHz - Specifies maximum guaranteed clock frequency for stable dual-channel register operation. |
| Input Voltage | Up to 5.5V - Allows direct connection to 5V TTL outputs without clamping diodes or external protection. |
| IOL / IOH | ±24mA - Supports driving multiple standard TTL loads or moderate-capacitance PCB traces directly. |
| Operating Temp | –40°C to +85°C - Qualified for commercial and industrial ambient environments without derating. |
| Power Dissipation | 45pF typical Cpd - Predictable dynamic power consumption for thermal estimation in dense logic layouts. |
Pinout & Package
The SN74ACT74NG4 is supplied in a 14-pin plastic dual in-line package (PDIP-N), with 19.3mm × 9.4mm body size and 0.100" lead pitch. The package includes through-hole leads compatible with wave soldering and prototyping breadboards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CLR | Channel 1 Clear Input | Asynchronous active-low reset: forces Q1 = L, Q1̅ = H regardless of clock or data state. |
| 2 D1 | Channel 1 Data Input | Synchronous data input sampled on rising CLK edge when PRE and CLR are inactive (high). |
| 3 CLK1 | Channel 1 Clock Input | Positive-edge-triggered clock; initiates data capture and output update only on rising transition. |
| 4 PRE1 | Channel 1 Preset Input | Asynchronous active-low set: forces Q1 = H, Q1̅ = L independently of clock or data. |
| 5 Q1 | Channel 1 True Output | Non-inverted registered output reflecting D1 state after CLK1 rising edge (if not overridden). |
| 6 Q1̅ | Channel 1 Complement Output | Inverted output, always opposite Q1 when flip-flop is stable and not asynchronously forced. |
| 7 GND | Ground Reference | Primary return path for all internal logic and I/O currents; must be low-impedance for noise control. |
| 8 Q2̅ | Channel 2 Complement Output | Inverted output for second flip-flop; complements Q2 under normal synchronous operation. |
| 9 Q2 | Channel 2 True Output | Non-inverted registered output for second independent D-flip-flop channel. |
| 10 PRE2 | Channel 2 Preset Input | Asynchronous active-low set for second channel; functionally identical to PRE1. |
| 11 CLK2 | Channel 2 Clock Input | Independent positive-edge clock for second flip-flop; allows separate or shared clocking schemes. |
| 12 D2 | Channel 2 Data Input | Second synchronous data input, isolated from Channel 1 except for shared VCC/GND rails. |
| 13 CLR2 | Channel 2 Clear Input | Asynchronous active-low reset for second channel; identical timing and electrical behavior to CLR1. |
| 14 VCC | Positive Supply | 5V nominal supply rail; requires local 0.1µF bypass capacitor placed adjacent to pin for stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent D-type flip-flops | Enables compact implementation of two-bit registers or split control paths without inter-channel coupling. |
| Asynchronous preset and clear per channel | Allows deterministic initialization or fault recovery without waiting for clock edges or affecting other channels. |
| TTL-voltage-compatible inputs | Accepts standard 5V TTL logic levels (VIH ≥ 2V, VIL ≤ 0.8V) while operating on 5V supply - no level translation needed. |
| 10.5ns max propagation delay at 5V | Provides timing margin for critical setup/hold windows in 85MHz systems with PCB trace delays up to ~1.5ns/inch. |
| ±24mA output drive capability | Drives up to 10 standard TTL loads or 30pF capacitive load directly, reducing need for buffer stages. |
Applications
| Industrial PLC I/O Register | Digital Audio Sample Buffer |
|---|---|
Use Scenario: Capturing and holding sensor status bits (e.g., limit switches, emergency stops) in programmable logic controller input modules. IC Role / Device Role / Timing Role: Synchronous sampling of parallel 5V TTL sensor signals on system clock edge; asynchronous CLR used for hardware-initiated reset during fault conditions. Use Value: Guarantees metastability-free registration of noisy industrial signals via controlled setup/hold timing and strong noise immunity (ACT family). | Use Scenario: Latching left/right channel audio sample data between ADC and DSP processing stages in consumer audio equipment. IC Role / Device Role / Timing Role: Dual-channel edge-triggered register aligning stereo samples to a common master clock; Q/Q̅ outputs support differential signaling or redundancy checking. Use Value: 10.5ns tpd ensures minimal skew between L/R channels, preserving phase coherence in time-sensitive audio paths. |
| Legacy Bus Interface Logic | Test Equipment Pattern Generator |
Use Scenario: Adapting modern microcontroller GPIO to legacy 5V parallel buses (e.g., ISA, GPIB auxiliary lines) requiring synchronized handshaking. IC Role / Device Role / Timing Role: Data latch for bidirectional bus transceivers; PRE/CLR pins manage bus arbitration states independent of CPU clock domain. Use Value: 5.5V-tolerant inputs eliminate external clamping diodes when interfacing with older 5V-only peripherals. | Use Scenario: Generating precise, repeatable digital stimulus patterns (e.g., PRBS, walking 1s) for IC functional testing in ATE systems. IC Role / Device Role / Timing Role: Core building block in shift-register-based pattern sequencers; dual flip-flops implement 2-bit state counters or pipeline stages. Use Value: Guaranteed 85MHz fmax supports pattern rates up to 42.5MHz for high-speed digital device validation. |
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 ACT logic family, identical electrical specs, but in SOIC-14 package (8.65mm × 6mm) instead of PDIP. | Requires surface-mount assembly; unsuitable for through-hole prototyping or legacy wave-soldered boards. | Select SN74ACT74DR for space-constrained PCBs where reflow soldering is available and manual prototyping is not required. |
| 74ACT74PC | Functionally identical dual DFF, but manufactured by ON Semiconductor; same 14-pin PDIP package and 4.5–5.5V operation. | No TI-specific support resources; minor differences in thermal resistance (RθJA = 80°C/W vs. TI's 80°C/W for N package) and marking format. | Choose 74ACT74PC when sourcing diversification is prioritized and TI documentation access is non-critical. |
Compared with SN74ACT74DR and 74ACT74PC, the SN74ACT74NG4 offers identical logic functionality and timing but provides through-hole mounting for rapid evaluation and legacy manufacturing compatibility - making it optimal for development, repair, and mixed-technology assemblies where SOIC rework or alternate-brand qualification is impractical.
Availability
SN74ACT74NG4 is available at Aetrix Electronics and suitable for industrial control systems, test equipment design, legacy bus interface development, and educational electronics projects requiring stable component supply and long-term obsolescence management.
Supply support for SN74ACT74NG4 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 high-reliability components.
The SN74ACT74NG4 belongs to TI's 74ACT advanced CMOS logic family, designed specifically for high-speed, low-noise 5V digital systems requiring TTL compatibility, robust ESD tolerance, and predictable timing margins in industrial and instrumentation applications.
FAQ
What is the maximum clock frequency supported by the SN74ACT74NG4?
The SN74ACT74NG4 is rated for a maximum clock frequency of 85MHz under recommended operating conditions (VCC = 4.5V–5.5V, TA = –40°C to +85°C). This value is guaranteed by TI's switching characteristics specification and reflects worst-case timing across process, voltage, and temperature corners. The SN74ACT74NG4 achieves this using ACT-family silicon optimized for speed and noise immunity, and actual usable frequency may increase slightly at 5V and 25°C, but system design should adhere to the 85MHz limit for reliability.
Does the SN74ACT74NG4 support asynchronous reset and set functions?
Yes, the SN74ACT74NG4 provides fully asynchronous active-low preset (PRE) and clear (CLR) inputs for each of its two D-type flip-flops. When PRE is pulled low, Q is forced high and Q̅ low immediately, independent of the clock or data state. Similarly, a low on CLR forces Q low and Q̅ high. These functions operate with guaranteed minimum pulse widths of 6ns and override all synchronous operations - enabling hardware-initiated initialization or fault recovery without clock dependency.
Can the SN74ACT74NG4 be used with 3.3V logic interfaces?
The SN74ACT74NG4 is not designed for direct 3.3V logic interfacing as a powered device: its VCC must be 4.5V–5.5V, and its inputs require VIH ≥ 2.0V and VIL ≤ 0.8V for reliable recognition - which aligns with 5V TTL thresholds, not 3.3V CMOS. While inputs tolerate up to 5.5V, connecting 3.3V outputs directly risks marginal high-level detection. For 3.3V system integration, use level-shifting circuitry or select a 3.3V-compatible dual DFF such as the SN74LVC74A.
What is the thermal resistance (RθJA) of the SN74ACT74NG4 in its PDIP package?
The SN74ACT74NG4 in the 14-pin PDIP (N) package has a junction-to-ambient thermal resistance (RθJA) of 80°C/W, as specified in TI's SCAS520J datasheet Section 4.3. This value assumes standard JEDEC 2S2P board conditions and is critical for estimating die temperature rise under load. With a maximum ambient temperature of +85°C and typical ICC of 20µA, self-heating is negligible; however, under heavy capacitive loading or high-frequency switching, power dissipation must be calculated using Cpd = 45pF and fmax to confirm safe operation within the 125°C absolute maximum junction temperature limit.
Is the SN74ACT74NG4 RoHS compliant?
Yes, the SN74ACT74NG4 is RoHS compliant, as confirmed in TI's official packaging addendum: it carries "Yes" in the RoHS column and uses NiPdAu (NIPDAU) lead finish. The part marking "SN74ACT74N" appears on the package body, and it meets EU Directive 2011/65/EU requirements for restriction of hazardous substances. No exemptions apply, and the device is suitable for use in environmentally regulated commercial and industrial products without additional compliance verification.
SN74ACT74NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 14-PDIP
SN74ACT74NG4 FAQ
1.How can I place an order for SN74ACT74NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT74NG4 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 SN74ACT74NG4 reliable?
The price and inventory of SN74ACT74NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT74NG4 is usually 5 days.
3.What payment methods are accepted for SN74ACT74NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT74NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT74NG4?
SN74ACT74NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT74NG4 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 SN74ACT74NG4?
For technical support, including SN74ACT74NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT74NG4 requirements.
6.How does Aetrix verify that SN74ACT74NG4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT74NG4 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 SN74ACT74NG4 meets industry standards.
7.What is the process for return or replacement of SN74ACT74NG4?
All SN74ACT74NG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT74NG4, 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 SN74ACT74NG4 part is unused and in its original packaging.
Return procedure for SN74ACT74NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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