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Texas Instruments SN74AC374PW
- Part No.:
- SN74AC374PW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AC374PW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:125
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Product details
Overview
SN74AC374PW from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state noninverting outputs, operating across 2V–6V VCC, featuring 9.5ns max propagation delay at 5V and designed for bus interface, I/O port buffering, and bidirectional data latching in industrial control and embedded systems.
For engineers reviewing the SN74AC374PW datasheet, SN74AC374PW pinout, SN74AC374PW application, or SN74AC374PW equivalent, key selection criteria include its TSSOP-20 package, 3-state output drive capability, 5V/3.3V timing compatibility, OE-controlled high-impedance state, and direct bus-line interfacing without external pull-ups.
Technical Context
The SN74AC374PW implements eight independent D-type flip-flops triggered on the positive clock edge, with synchronous data capture and asynchronous 3-state output control via the active-low OE input. Its logic-level tolerant inputs accept up to 6V regardless of VCC, enabling mixed-voltage system interfacing.
Each output drives capacitive or low-impedance loads directly, supporting bus-hold-free operation in shared-data-path architectures. Internal circuitry retains stored data during OE assertion, allowing seamless data staging while outputs float.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports interoperability across 3.3V and 5V logic domains without level shifters |
| Max tpd | 9.5ns at 5V - enables reliable operation up to 100MHz clock frequency in synchronous bus applications |
| Output Drive | ±24mA at 5V - sufficient to drive standard TTL/CMOS loads and moderate PCB trace capacitance |
| Input Voltage Tolerance | Up to 6V - allows safe interfacing with higher-voltage peripherals or legacy 5V signals |
| 3-State Leakage | ±2.5μA at 5.5V - ensures minimal bus leakage during high-impedance mode, critical for multi-drop bus integrity |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded environments |
| Power Dissipation Cap. | 40pF at 5V/1MHz - quantifies dynamic power consumption for thermal budgeting in dense layouts |
Pinout & Package
TSSOP-20 (PW) package: 6.50mm × 6.4mm body size, 0.65mm lead pitch, 2.0mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Asserting low enables all eight Q outputs; high places them in high-impedance state without affecting internal latch state |
| 2–9, 12, 15–16, 19 (Q1–Q8) | Noninverting 3-state outputs | Drive bus lines directly; high-impedance when OE is high, eliminating need for external bus termination |
| 3–4, 7–8, 13–14, 17–18 (D1–D8) | Data inputs | Sampled on rising CLK edge; tolerate voltages up to 6V independent of VCC |
| 10 (GND) | Ground reference | Primary return path for all I/O and internal logic; requires low-inductance connection to minimize ground bounce |
| 11 (CLK) | Clock input | Rising-edge sensitive; supports 100MHz operation at 5V with 4ns minimum pulse width |
| 20 (VCC) | Power supply | Supplies core logic and output drivers; requires local 0.1μF bypass capacitor per device |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2V–6V) | Enables single-component support for both 3.3V and 5V system rails without voltage translation |
| Input overvoltage tolerance (to 6V) | Permits safe connection to 5V buses in mixed-supply systems without external clamping diodes |
| 9.5ns max tpd at 5V | Supports high-speed data capture in real-time control loops and synchronous memory interfaces |
| 3-state noninverting outputs | Allows direct connection to shared data buses with deterministic contention avoidance via OE control |
| Full parallel data loading | Enables simultaneous latching of eight-bit words on a single clock edge for register-file or FIFO staging |
Applications
| Industrial PLC I/O Expansion | Embedded Microcontroller Bus Interface |
|---|---|
Use Scenario: Expanding GPIO count on a programmable logic controller mainboard to support additional sensor/actuator modules. IC Role / Device Role / Timing Role: Acts as an 8-bit output latch and input buffer between the controller's address/data bus and field-side isolation circuitry. Use Value: Eliminates need for discrete pull-up resistors or bus transceivers due to 3-state drive and 6V-tolerant inputs, reducing BOM cost and board area. | Use Scenario: Interfacing an 8-bit microcontroller with external SRAM or peripheral ICs sharing a common data bus. IC Role / Device Role / Timing Role: Provides registered data path control with OE-synchronized bus release, preventing data contention during memory read/write cycles. Use Value: Enables clean bus arbitration using only one control signal (OE), simplifying firmware timing requirements versus discrete gate-based solutions. |
| Digital Test Equipment Data Capture | Automated Test Fixture Signal Conditioning |
Use Scenario: Capturing parallel digital waveforms from DUTs in benchtop ATE systems with precise timestamp alignment. IC Role / Device Role / Timing Role: Serves as a synchronized sampling register, capturing 8-bit status or measurement data on each CLK rising edge. Use Value: 9.5ns propagation delay and 1.5ns hold time at 5V ensure setup/hold margin for sub-10ns timing windows in high-resolution test patterns. | Use Scenario: Isolating and conditioning signals between a PC-based test controller and high-noise factory-floor equipment. IC Role / Device Role / Timing Role: Functions as a buffered, direction-controlled I/O port with configurable high-Z states during reconfiguration phases. Use Value: Input overvoltage tolerance protects against ESD and transient coupling from industrial wiring, improving long-term reliability in unshielded environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC374APW | Lower VCC range (1.65V–3.6V); 3.3V-only optimized; 6.7ns tpd at 3.3V | Better suited for modern low-voltage portable designs; not 5V-tolerant | Select when system operates exclusively at 3.3V and speed >85MHz is required |
| 74AC574PC | PDIP-20 package; identical AC logic family; same 2V–6V VCC and timing specs | Through-hole mounting; no surface-mount footprint constraints; higher thermal resistance (RθJA = 69°C/W) | Select for prototyping, legacy board repair, or applications requiring manual assembly or higher thermal margin |
Compared with SN74LVC374APW and 74AC574PC, the SN74AC374PW uniquely balances 5V/3.3V interoperability, TSSOP space efficiency, and industrial temperature rating-making it optimal for mixed-voltage industrial controllers where layout density and voltage flexibility are critical.
Availability
SN74AC374PW is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, embedded microcontroller bus interface, digital test equipment data capture, and automated test fixture signal conditioning requiring stable component supply across extended product lifecycles.
Supply support for SN74AC374PW 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 delivering analog and embedded processing solutions, with over 90 years of innovation in logic, power management, and signal chain technologies.
The SNx4AC374 family was engineered for robust bus-oriented digital interfacing in industrial automation and instrumentation, emphasizing voltage flexibility, noise immunity, and direct drive capability without external components.
FAQ
What is the maximum clock frequency supported by the SN74AC374PW at 5V operation?
The SN74AC374PW supports a maximum clock frequency of 100MHz at VCC = 5V ± 0.5V, as specified in Section 4.6 of the TI SCAS543G datasheet. This is enabled by its 4ns minimum clock pulse width and 4.5ns data setup time, ensuring reliable edge-triggered capture in high-speed synchronous systems. The SN74AC374PW maintains timing integrity across its full industrial temperature range.
Does the SN74AC374PW require external pull-up resistors on its 3-state outputs?
No, the SN74AC374PW does not require external pull-up resistors on its 3-state outputs. Its 3-state outputs are designed for direct bus-line driving, and the high-impedance state presents negligible leakage (±2.5μA at 5.5V). External pull-ups are unnecessary unless a specific bus protocol mandates weak biasing during tri-state periods - a condition not required by the SN74AC374PW's functional specification.
Can the SN74AC374PW safely interface with 5V logic while powered from a 3.3V supply?
Yes, the SN74AC374PW can safely interface with 5V logic while powered from 3.3V. Its inputs tolerate voltages up to 6V regardless of VCC, and its outputs swing rail-to-rail (0V to 3.3V) with ±24mA drive strength. This allows direct connection to 5V-tolerant receivers without level shifters, though 5V-driven loads must be compatible with 3.3V logic thresholds.
What is the recommended bypass capacitor for the SN74AC374PW VCC pin?
Texas Instruments recommends a 0.1μF ceramic bypass capacitor placed as close as possible to the SN74AC374PW VCC pin, per Section 7.1 of the SCAS543G datasheet. For improved high-frequency noise suppression, a parallel combination of 0.1μF and 1μF capacitors is acceptable. The capacitor must connect directly between VCC and GND with minimal trace length to reduce inductance and maintain power integrity.
Is the SN74AC374PW pin-compatible with other members of the SN74AC374 family?
Yes, the SN74AC374PW is pin-compatible with all SN74AC374 variants in the same 20-pin TSSOP (PW), SSOP (DB), SOIC (DW), SOP (NS), and PDIP (N) packages. Pin functions-including OE, CLK, D1–D8, Q1–Q8, VCC, and GND-are identical across these packages. However, thermal performance and board layout constraints differ; the SN74AC374PW's TSSOP-20 offers superior density but higher RθJA (83°C/W) than SOIC or PDIP versions.
SN74AC374PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 155 MHz
- Max Propagation Delay @ V, Max CL:
- 9.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 4.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AC374PW FAQ
1.How can I place an order for SN74AC374PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC374PW 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 SN74AC374PW reliable?
The price and inventory of SN74AC374PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC374PW is usually 5 days.
3.What payment methods are accepted for SN74AC374PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC374PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC374PW?
SN74AC374PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC374PW 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 SN74AC374PW?
For technical support, including SN74AC374PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC374PW requirements.
6.How does Aetrix verify that SN74AC374PW is sourced from the original manufacturer or authorized distributors?
All SN74AC374PW 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 SN74AC374PW meets industry standards.
7.What is the process for return or replacement of SN74AC374PW?
All SN74AC374PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC374PW, 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 SN74AC374PW part is unused and in its original packaging.
Return procedure for SN74AC374PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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