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Texas Instruments SN74ACT74PW
- Part No.:
- SN74ACT74PW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ACT74PW.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,637
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Product details
Overview
SN74ACT74PW from Texas Instruments is a dual positive-edge-triggered D-type flip-flop IC operating at 4.5V–5.5V VCC, with 10.5ns max propagation delay at 5V, TTL-compatible inputs, and independent preset/clear per channel. It serves as a synchronous storage element in digital control logic, clock domain synchronization, and state machine sequencing in industrial PLCs and test equipment.
For engineers reviewing the SN74ACT74PW datasheet, SN74ACT74PW pinout, SN74ACT74PW application, or SN74ACT74PW equivalent, this page delivers verified package mapping (TSSOP-14), functional pin roles, timing constraints (tsu = 3.5ns, th = 1ns), thermal resistance (RθJA = 145.7°C/W), and two validated alternative parts for design continuity.
Technical Context
The SN74ACT74PW implements two independent edge-triggered D flip-flops with asynchronous active-low preset (PRE) and clear (CLR) inputs per channel. Each channel samples data on the rising edge of CLK and latches it to Q/Q̅ outputs without internal feedback or metastability hardening.
It uses ACT (Advanced CMOS TTL-compatible) logic family architecture, supporting 5V operation with input voltage tolerance up to 5.5V and output drive capability of ±24mA at VCC = 5V. No internal pull-ups, no Schmitt-trigger inputs, and no power-down mode are implemented.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - Specifies strict 5V nominal supply tolerance; operation outside this range risks functional failure or latch-up. |
| Max tpd | 10.5ns at 5V - Defines worst-case propagation delay from CLK↑ to Q/Q̅ transition; critical for setup/hold margin in high-speed counters. |
| tsu / th | 3.5ns / 1ns - Minimum data setup and hold times relative to CLK↑; determines maximum input data rate before violation. |
| IOH/IOL | –24mA / +24mA - Sustained output drive strength into resistive loads; supports direct interface to 50Ω transmission lines or multiple TTL inputs. |
| Cpd | 45pF - Power dissipation capacitance at 1MHz/50pF load; used to calculate dynamic power consumption (Pdyn = Cpd × VCC² × f). |
| RθJA | 145.7°C/W - Junction-to-ambient thermal resistance in TSSOP-14 package; dictates maximum allowable power dissipation at 85°C ambient. |
Pinout & Package
TSSOP-14 (PW) package: 5mm × 6.4mm body with 0.65mm pitch, 14-pin surface-mount, exposed pad not present. RoHS-compliant, NIPDAU/SN lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CLR | Input | Active-low asynchronous clear for Channel 1; forces Q = L, Q̅ = H regardless of CLK or D state. |
| 2 D | Input | Data input for Channel 1; sampled on next CLK↑ if PRE and CLR are high. |
| 3 CLK | Input | Positive-edge-triggered clock for Channel 1; transition from low to high initiates sampling and latching. |
| 4 PRE | Input | Active-low asynchronous preset for Channel 1; forces Q = H, Q̅ = L regardless of CLK or D state. |
| 5 Q | Output | Non-inverted output of Channel 1; reflects latched D value after CLK↑. |
| 6 Q̅ | Output | Inverted output of Channel 1; complementary to Q, no internal inversion delay added. |
| 7 GND | Power | Digital ground reference; must be low-impedance connection to minimize noise coupling into logic thresholds. |
| 8 2Q̅ | Output | Inverted output of Channel 2; electrically isolated from Channel 1 outputs. |
| 9 2Q | Output | Non-inverted output of Channel 2; independent timing and loading behavior from Channel 1. |
| 10 2PRE | Input | Active-low asynchronous preset for Channel 2; no interaction with Channel 1 control signals. |
| 11 2CLK | Input | Positive-edge-triggered clock for Channel 2; separate timing domain from Channel 1 CLK. |
| 12 2D | Input | Data input for Channel 2; no electrical or functional dependency on Channel 1 D input. |
| 13 2CLR | Input | Active-low asynchronous clear for Channel 2; independent assertion does not affect Channel 1 state. |
| 14 VCC | Power | +5V supply rail; requires local 0.1µF ceramic bypass capacitor placed within 3mm of pin per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-voltage compatible inputs | Accepts 0V–5.5V input levels while powered from 4.5V–5.5V VCC, enabling direct interfacing with legacy 5V TTL logic without level shifters. |
| Asynchronous preset/clear per channel | Independent PRE/CLR pins allow immediate initialization or reset of each flip-flop without waiting for clock edge or affecting the other channel. |
| 10.5ns max propagation delay | Enables reliable operation in 85MHz clock domains (1/10.5ns ≈ 95MHz theoretical max), suitable for fast counter and register applications. |
| ±24mA output drive | Drives up to 10 standard TTL loads or one 50Ω transmission line, eliminating need for external buffer stages in moderate fanout designs. |
| Low input capacitance (3pF) | Minimizes capacitive loading on driving sources, preserving signal integrity and reducing switching power in high-frequency clock trees. |
Applications
| Industrial Control Logic | Digital Test Equipment |
|---|---|
|
Use Scenario: Synchronizing asynchronous sensor interrupts into a deterministic PLC scan cycle. IC Role / Device Role / Timing Role: Dual-channel edge-triggered latch capturing interrupt edges and holding status until polled by main controller. Use Value: Eliminates metastability risk via asynchronous PRE/CLR initialization and guarantees single-cycle capture alignment to system clock. |
Use Scenario: Generating precise, repeatable stimulus patterns for IC functional testing. IC Role / Device Role / Timing Role: Clock-domain crossing element converting pattern generator clock to device-under-test clock domain. Use Value: 10.5ns tpd and 3.5ns tsu enable sub-10ns timing resolution in pattern sequencers without added jitter. |
| Serial-to-Parallel Conversion | State Machine Sequencing |
|
Use Scenario: Converting serial bitstream from UART or SPI peripheral into parallel byte-wide data for microcontroller input. IC Role / Device Role / Timing Role: Shift register stage using cascaded DFFs clocked by recovered bit clock. Use Value: Independent preset/clear allows full parallel register reset between frames, preventing bit slip accumulation. |
Use Scenario: Implementing Moore-type finite state machines in glue logic for FPGA configuration controllers. IC Role / Device Role / Timing Role: State register storing current machine state, updated synchronously on system clock edge. Use Value: Dual independent channels reduce component count versus discrete single-DFF solutions, lowering board area and BOM cost. |
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 |
|---|---|---|---|
| SN74ACT74PWR | Same die, identical AC/DC specs, TSSOP-14 package, RoHS-compliant NIPDAU finish, MSL-1 rating. | No functional difference; differs only in tape-and-reel packaging (2000 pcs/reel vs. SN74ACT74PW's obsolete tube format). | Select SN74ACT74PWR for new designs requiring volume production, automated assembly, and guaranteed long-term availability. |
| SN74LVC74APW | Lower VCC range (1.65V–3.6V), 3.3V-only operation, 5.5ns tpd, ±24mA drive, but incompatible with 5V TTL input levels. | Requires level translation when interfacing with 5V systems; unsuitable for mixed-voltage legacy designs without additional circuitry. | Choose SN74LVC74APW only for pure 3.3V systems where lower power and higher speed justify redesign effort. |
Compared with SN74ACT74PW, SN74ACT74PWR offers identical functionality with modern packaging and assured supply, while SN74LVC74APW trades 5V compatibility for lower voltage operation and faster timing-making it viable only in fully 3.3V ecosystems.
Availability
SN74ACT74PW is available at Aetrix Electronics and suitable for industrial control logic, digital test equipment, serial-to-parallel conversion, and state machine sequencing requiring stable component supply across extended product lifecycles.
Supply support for SN74ACT74PW 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 founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial, automotive, and communications portfolio coverage.
The SN74ACT74PW belongs to TI's legacy Advanced CMOS (ACT) logic family, designed for robust 5V TTL-compatible digital interfacing in industrial automation, instrumentation, and legacy system upgrades.
FAQ
What is the maximum clock frequency supported by SN74ACT74PW?
The SN74ACT74PW 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 10.5ns max propagation delay and 3.5ns setup time, ensuring reliable edge-triggered operation without timing violations in synchronous circuits.
Does SN74ACT74PW have built-in ESD protection?
Yes, SN74ACT74PW incorporates standard CMOS ESD protection diodes on all I/O pins rated to ±2kV HBM per JEDEC JESD22-A114. However, TI recommends handling with standard ESD precautions during PCB assembly, as excessive discharge can still degrade performance or cause latent failures.
Can SN74ACT74PW operate with a 3.3V supply?
No, SN74ACT74PW is specified only for 4.5V–5.5V VCC. Operation below 4.5V violates recommended conditions and may result in undefined output states, increased propagation delay, or failure to meet TTL input threshold compatibility. For 3.3V systems, consider SN74LVC74A instead.
What is the function of the 2Q̅ pin on SN74ACT74PW?
The 2Q̅ pin on SN74ACT74PW is the inverted output of Channel 2. It provides the logical complement of the 2Q output, enabling direct implementation of toggle functions, differential signaling, or active-low enable paths without external inverters.
Is SN74ACT74PW pin-compatible with SN74LS74?
No, SN74ACT74PW is not pin-compatible with SN74LS74. While both are dual D-type flip-flops in 14-pin packages, SN74LS74 uses SOIC (D) or PDIP (N) footprints with different pin assignments-specifically, SN74LS74 places VCC at Pin 14 but assigns GND to Pin 7, whereas SN74ACT74PW retains identical pinout only within the ACT family (e.g., SN74ACT74PWR).
SN74ACT74PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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:
- 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-TSSOP
SN74ACT74PW FAQ
1.How can I place an order for SN74ACT74PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT74PW 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 SN74ACT74PW reliable?
The price and inventory of SN74ACT74PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT74PW is usually 5 days.
3.What payment methods are accepted for SN74ACT74PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT74PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT74PW?
SN74ACT74PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT74PW 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 SN74ACT74PW?
For technical support, including SN74ACT74PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT74PW requirements.
6.How does Aetrix verify that SN74ACT74PW is sourced from the original manufacturer or authorized distributors?
All SN74ACT74PW 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 SN74ACT74PW meets industry standards.
7.What is the process for return or replacement of SN74ACT74PW?
All SN74ACT74PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT74PW, 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 SN74ACT74PW part is unused and in its original packaging.
Return procedure for SN74ACT74PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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