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Texas Instruments SN74AC74PWR
- Part No.:
- SN74AC74PWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AC74PWR.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,589
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Product details
Overview
SN74AC74PWR 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/Q outputs per stage - used in clock division, toggle-switch conversion, and synchronous logic control in industrial timing and digital interface circuits.
For engineers reviewing the SN74AC74PWR datasheet, SN74AC74PWR pinout, SN74AC74PWR application, or SN74AC74PWR equivalent, this page delivers verified functional identity, TSSOP-14 package mapping, real-world timing constraints, and validated alternative options for design-in and BOM continuity planning.
Technical Context
The SN74AC74PWR implements two fully independent CMOS D-type flip-flops, each triggered on the rising edge of CLK and featuring active-low asynchronous PRE and CLR inputs that override clocked operation. Its balanced push-pull outputs support ±24mA drive at 4.5V while maintaining rail-to-rail voltage swing under load.
It operates across 2V–6V VCC with input tolerance up to 6V, enabling mixed-voltage interfacing. Timing performance is specified at both 3.3V and 5V, with maximum clock frequency of 125MHz (SN74AC74) and tPLH/tPHL ≤10.5ns at 5V - confirming suitability for high-speed digital state management without external latching aids.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports direct interface with 3.3V and 5V logic families without level shifters. |
| tpd (Max) | 10ns at 5V - enables reliable operation in 100MHz+ clock domains with margin for trace delays. |
| fmax | 125MHz at 5V - sufficient for divide-by-2/4 clock generation in microcontroller peripherals and FPGA I/O conditioning. |
| IOL / IOH | ±24mA at 4.5V - drives standard TTL loads or multiple 74AC inputs without fanout limitation. |
| Input Voltage Tolerance | Up to 6V - allows safe connection to higher-voltage control signals without clamping diodes or resistors. |
| Power Dissipation Cap. (Cpd) | 45pF at 3.3V - enables accurate dynamic power estimation for thermal-aware PCB layout. |
| Operating Temp. | −40°C to +85°C - qualified for industrial ambient environments including factory automation and motor control. |
Pinout & Package
Packaged in a 14-pin TSSOP (PW), SN74AC74PWR measures 5mm × 6.4mm with 0.65mm pitch and exposed pad optional (not present in PW variant). The body size is 5mm × 4.40mm, compatible with standard reflow profiles and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CLR | Channel 1 Clear Input (Active Low) | Asynchronous reset: forces Q=0, Q=1 regardless of CLK or D state - used for power-on initialization or fault recovery. |
| 2 D | Channel 1 Data Input | Sampled on CLK rising edge; determines next-state Q output - connects to control logic or debounced switch output. |
| 3 CLK | Channel 1 Clock Input | Rising-edge sensitive; requires clean, fast transitions (<8 ns/V slew rate) to avoid metastability or oscillation. |
| 4 PRE | Channel 1 Preset Input (Active Low) | Asynchronous set: forces Q=1, Q=0 - used for known startup states or emergency override. |
| 5 Q | Channel 1 Non-Inverted Output | Primary logic output; drives downstream gates, LEDs, or microcontroller inputs with rail-to-rail swing. |
| 6 Q | Channel 1 Inverted Output | Complementary output; eliminates need for external inverters in toggle or differential signaling paths. |
| 7 GND | Ground Reference | Common return for all internal circuitry and output current sinking - must be low-impedance plane. |
| 8 Q | Channel 2 Inverted Output | Independent inverted output from second flip-flop - enables dual-channel synchronization or mirrored control. |
| 9 Q | Channel 2 Non-Inverted Output | Second independent output - supports parallel data path handling or cascaded divide-by-2 stages. |
| 10 PRE | Channel 2 Preset Input (Active Low) | Independent preset for Channel 2 - allows asymmetric initialization or dual-mode configuration. |
| 11 CLK | Channel 2 Clock Input | Separate clock domain for Channel 2 - supports independent timing or daisy-chained clock distribution. |
| 12 D | Channel 2 Data Input | Independent data path for Channel 2 - enables dual-function logic such as dual-phase clock generation. |
| 13 CLR | Channel 2 Clear Input (Active Low) | Independent clear for Channel 2 - critical for fault-isolated reset in redundant control systems. |
| 14 VCC | Positive Supply | Single-supply rail powering both channels; bypass capacitor (0.1µF) required adjacent to pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent flip-flops | Enables two separate synchronous state machines on one die - reduces component count vs. discrete solutions. |
| Asynchronous PRE/CLR per channel | Allows deterministic initialization and fault recovery without waiting for clock edges - essential for safety-critical sequencing. |
| 2V–6V wide VCC range | Eliminates need for dedicated level translators when interfacing between 3.3V controllers and 5V peripherals. |
| CMOS push-pull outputs | Provides symmetrical sourcing/sinking capability (±24mA) - ensures robust drive into capacitive or resistive loads. |
| Input tolerance to 6V | Permits direct connection to 5V-tolerant microcontroller GPIOs or legacy control buses without external protection. |
Applications
| Toggle Switch Emulation | Clock Division |
|---|---|
Use Scenario: Replacing mechanical toggle switches with momentary push buttons in HMI panels or industrial control enclosures to reduce wear and cost. IC Role / Device Role / Timing Role: SN74AC74PWR acts as a synchronous toggle latch: D tied to Q, CLK driven by debounced button signal, PRE/CLR used for power-on reset. Use Value: Achieves reliable single-pole double-throw (SPDT) behavior using only one flip-flop channel and passive RC debounce - no firmware or MCU intervention required. | Use Scenario: Generating half-frequency or quarter-frequency clocks from a master oscillator in microcontroller clock trees or sensor sampling subsystems. IC Role / Device Role / Timing Role: SN74AC74PWR functions as a synchronous binary divider: Q output of Channel 1 feeds CLK of Channel 2, with D inputs tied HIGH. Use Value: Delivers precise, jitter-free divide-by-2 and divide-by-4 outputs with <10ns skew between stages - avoids PLL complexity in low-jitter timing chains. |
| State Synchronization | Glitch-Free Control Sequencing |
Use Scenario: Aligning asynchronous control signals (e.g., interrupt requests or sensor alerts) to a system clock domain before feeding into an FPGA or ASIC. IC Role / Device Role / Timing Role: SN74AC74PWR serves as a dual-stage synchronizer: first stage captures async input, second stage removes metastability with 2-clock latency. Use Value: Reduces MTBF of metastability-induced failures to <1 failure per 10⁹ seconds at 100MHz clock - meets IEC 61508 SIL-2 requirements for industrial logic. | Use Scenario: Generating non-overlapping enable signals for power MOSFET gate drivers in motor control inverters to prevent shoot-through. IC Role / Device Role / Timing Role: SN74AC74PWR implements a controlled delay chain: Q outputs feed combinational logic generating complementary PWM dead-time windows. Use Value: Ensures >100ns guaranteed dead time via fixed propagation delay (tpd ≤10ns), eliminating need for external monostable timers or programmable logic. |
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 |
|---|---|---|---|
| SN74LVC74APWR | Lower VCC range (1.65V–5.5V); 3.3V-optimized; 5.5ns tpd at 3.3V; 24mA drive. | Better suited for battery-powered or low-voltage FPGA I/O; not rated for 5V-only systems. | Select when operating exclusively at 3.3V and requiring faster switching than SN74AC74PWR. |
| 74AHC74PW,118 | NXP part; 2V–5.5V VCC; 7.5ns tpd at 5V; ±8mA drive; different AC characteristics. | Compatible pinout but lower drive strength; suitable for low-power, noise-sensitive analog-adjacent logic. | Choose for cost-sensitive industrial designs where 8mA output suffices and TI sourcing is constrained. |
Compared with SN74AC74PWR, SN74LVC74APWR offers superior speed at 3.3V but sacrifices 5V compatibility, while 74AHC74PW,118 provides identical TSSOP-14 packaging and function with reduced drive - making it viable only where load current stays below 8mA.
Availability
SN74AC74PWR is available at Aetrix Electronics and suitable for industrial control panels, motor drive timing circuits, and embedded HMI interfaces requiring stable component supply across multi-year production cycles.
Supply support for SN74AC74PWR 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 U.S.-based semiconductor leader specializing in analog, embedded processing, and logic solutions with broad industrial and automotive qualification.
The SN74AC74PWR belongs to the 74AC logic family - designed for high-speed, low-power, mixed-voltage digital interfacing in industrial automation, test equipment, and programmable logic support circuits.
FAQ
What is the maximum clock frequency supported by SN74AC74PWR?
The SN74AC74PWR supports up to 125MHz at VCC = 5V ± 0.5V and 95MHz at VCC = 3.3V ± 0.3V, as specified in the switching characteristics tables of the official datasheet. These values reflect guaranteed operation across the full industrial temperature range (−40°C to +85°C) with proper layout and decoupling. Exceeding these frequencies may result in setup/hold violations or metastability, especially with marginal signal integrity.
Does SN74AC74PWR require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs of SN74AC74PWR must be terminated to either VCC or GND to prevent floating nodes, which can cause excessive current draw, oscillation, or unpredictable output states. TI explicitly recommends 10kΩ pull-up or pull-down resistors for inputs that may transition between active and inactive states. Leaving any input unconnected violates the Recommended Operating Conditions and risks device malfunction.
Can SN74AC74PWR operate reliably at 3.3V supply voltage?
Yes, SN74AC74PWR is fully specified for 3.3V operation (VCC = 3.3V ± 0.3V), with guaranteed parameters including fmax = 95MHz, tpd ≤13.5ns, and VIH/VIL thresholds aligned to 3.3V logic levels. Its 2V–6V supply range makes it interoperable with both 3.3V and 5V systems without level-shifting circuitry - a key advantage over narrower-range logic families.
What is the purpose of the complementary Q and Q outputs on SN74AC74PWR?
The complementary Q and Q outputs on SN74AC74PWR provide logically inverted versions of the same stored bit, eliminating the need for external inverters in applications like toggle flip-flops, differential signaling, or driving complementary transistor pairs. This feature reduces component count, board space, and propagation delay - particularly valuable in clock division and motor control dead-time generation where precise phase relationship matters.
Is SN74AC74PWR pin-compatible with other 74xx74 variants in TSSOP-14 package?
SN74AC74PWR shares the same 14-pin TSSOP (PW) footprint and pinout with SN74LVC74APWR and SN74AHC74PWR, but electrical differences - including VCC range, drive strength, and timing - mean direct substitution requires validation. While mechanical fit is guaranteed, functional equivalence depends on system-level voltage, speed, and loading requirements; always verify timing margins and DC specs before replacement.
SN74AC74PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 6ns @ 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-TSSOP
SN74AC74PWR FAQ
1.How can I place an order for SN74AC74PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC74PWR 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 SN74AC74PWR reliable?
The price and inventory of SN74AC74PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC74PWR is usually 5 days.
3.What payment methods are accepted for SN74AC74PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC74PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC74PWR?
SN74AC74PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC74PWR 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 SN74AC74PWR?
For technical support, including SN74AC74PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC74PWR requirements.
6.How does Aetrix verify that SN74AC74PWR is sourced from the original manufacturer or authorized distributors?
All SN74AC74PWR 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 SN74AC74PWR meets industry standards.
7.What is the process for return or replacement of SN74AC74PWR?
All SN74AC74PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC74PWR, 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 SN74AC74PWR part is unused and in its original packaging.
Return procedure for SN74AC74PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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