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Texas Instruments SN74AHCT374NSRE4
- Part No.:
- SN74AHCT374NSRE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74AHCT374NSRE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,163
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Product details
Overview
SN74AHCT374NSRE4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for synchronous data latching and bus interface in 5V digital systems. It operates from 4.5V to 5.5V VCC, delivers 10.5ns propagation delay at 5V/15pF, supports up to 80MHz clock frequency, and features TTL-compatible inputs for seamless integration with legacy logic.
For engineers reviewing the SN74AHCT374NSRE4 datasheet, SN74AHCT374NSRE4 pinout, SN74AHCT374NSRE4 application, or SN74AHCT374NSRE4 equivalent, this device is selected for parallel data synchronization, high-drive bus buffering, and I/O port expansion where precise edge-triggered storage and output enable control are required.
Technical Context
The SN74AHCT374NSRE4 implements eight independent D-type flip-flops sharing a common rising-edge-triggered CLK input and active-low OE control. Its flow-through pinout minimizes PCB routing complexity in bus-oriented designs. All outputs support true 3-state operation-high-impedance, logic-high, and logic-low-with balanced sourcing/sinking capability (±25mA).
It uses TTL-compatible CMOS input thresholds (VIH = 2.0V min, VIL = 0.8V max at VCC = 4.5–5.5V), enabling direct interfacing with standard TTL families without level shifters. Latch-up immunity exceeds 250mA per JESD17, and ESD protection meets ±2000V HBM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - Ensures compatibility with standard 5V logic rails and tolerance to supply ripple. |
| Propagation Delay (tPLH/tPHL) | 10.5ns max at VCC = 5V, CL = 15pF - Enables reliable timing in high-speed 80MHz bus applications. |
| Maximum Clock Frequency | 80MHz at CL = 15pF - Supports real-time data capture in industrial control and instrumentation interfaces. |
| Output Drive Strength | ±25mA continuous - Sufficient to drive multiple CMOS loads or moderate capacitive buses without external buffers. |
| Input Compatibility | TTL-compatible (VIH ≥ 2.0V, VIL ≤ 0.8V) - Allows direct connection to 74LS, 74F, and other TTL-family outputs. |
| 3-State Enable Delay (tPZH/tPZL) | 11.5ns max - Guarantees fast bus release for time-critical multiplexed data paths. |
| Quiescent Supply Current (ICC) | 40µA max at VCC = 5.5V - Minimizes static power in always-on control logic stages. |
Pinout & Package
SN74AHCT374NSRE4 is packaged in a 20-pin NS (SOIC) package measuring 12.80mm × 10.3mm body size, with gull-wing leads optimized for automated assembly and thermal reliability in industrial environments.
| 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 for bus sharing. |
| 2 (1Q) – 9 (4Q), 12 (5Q) – 13 (5D), 14 (6D) – 19 (8Q) | Channel I/O pairs (Dn/Qn) | Flow-through arrangement (D1–Q1, D2–Q2, etc.) simplifies PCB trace routing across data buses. |
| 10 (CLK) | Rising-edge clock input | Samples all eight D inputs simultaneously on CLK ↑; no internal metastability mitigation circuitry. |
| 11 (GND) | Ground reference | Common return path for all signals and power; must be low-impedance to maintain noise margin. |
| 20 (VCC) | Positive supply | Must be decoupled with 0.1µF ceramic capacitor placed adjacent to pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Minimizes trace crossovers and layer count in dense 8-bit data bus layouts. |
| Balanced CMOS 3-state outputs | Equal ±25mA drive ensures consistent rise/fall times and reduces bus contention risk. |
| TTL-compatible inputs | Eliminates need for external level translators when interfacing with 74LS or 74F logic families. |
| High latch-up immunity | Exceeds 250mA per JESD17 - critical for robustness in noisy industrial or motor-control environments. |
| Low dynamic power dissipation | 27pF typical Cpd enables efficient operation in battery-backed or thermally constrained systems. |
Applications
| Parallel Data Synchronization | Bus Interface Buffering |
|---|---|
|
Use Scenario: Capturing asynchronous sensor data streams into a synchronized microcontroller input port. IC Role / Device Role / Timing Role: Edge-triggered latch holding 8-bit parallel samples on system clock edge for deterministic read timing. Use Value: Eliminates setup/hold violations between sensor and MCU by providing clean, clock-aligned data capture with 10.5ns delay predictability. |
Use Scenario: Isolating and driving a shared address/data bus between two processor subsystems. IC Role / Device Role / Timing Role: Bidirectional bus driver with 3-state control enabling time-multiplexed access without contention. Use Value: ±25mA drive strength supports up to 10 standard CMOS loads while OE-controlled isolation prevents signal corruption during bus arbitration. |
| Industrial I/O Expansion | Pattern Generation Logic |
|
Use Scenario: Adding programmable digital output capability to a PLC mainboard via SPI-to-parallel translation. IC Role / Device Role / Timing Role: Output register staging commands from serial interface before releasing to field actuators on next clock edge. Use Value: Active-low OE allows safe power-up default (outputs disabled) and eliminates glitches during configuration handshaking. |
Use Scenario: Generating fixed test patterns for memory or FPGA validation using a microcontroller's GPIO port. IC Role / Device Role / Timing Role: Parallel pattern store holding precomputed bit sequences for rapid output cycling. Use Value: 80MHz maximum clock rate enables sub-13ns pattern step resolution, supporting high-speed functional testing of downstream logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT574PWRE4 | Same 20-pin TSSOP package, identical electrical specs, but includes separate LE (latch enable) instead of shared CLK edge trigger. | Used where asynchronous data capture (via LE strobe) is preferred over synchronous clocked sampling. | Select SN74AHCT574PWRE4 only if system requires independent latch control rather than strict edge-triggered behavior. |
| 74LVX374MTCX | Lower VCC range (2.7–3.6V), 3.3V-only operation; 11ns delay at 3.3V/15pF; different pinout (no flow-through). | Targeted for 3.3V systems with tighter power budgets; not interoperable with 5V buses without level shifting. | Choose 74LVX374MTCX only for native 3.3V designs requiring lower static current (2µA ICC) and reduced voltage operation. |
Compared with SN74AHCT374NSRE4, SN74AHCT574PWRE4 offers functional flexibility via latch-enable control but sacrifices strict clock-synchronous behavior, while 74LVX374MTCX trades 5V compatibility and flow-through routing for 3.3V efficiency-neither is pin-compatible nor drop-in replaceable.
Availability
SN74AHCT374NSRE4 is available at Aetrix Electronics and suitable for industrial control systems, test equipment design, and embedded I/O expansion requiring stable component supply, long-term lifecycle support, and guaranteed 5V logic interoperability.
Supply support for SN74AHCT374NSRE4 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 decades of heritage in industry-standard logic families.
SN74AHCT374NSRE4 belongs to the AHCT advanced high-speed CMOS logic family, engineered for 5V systems requiring TTL compatibility, low power, and robust noise immunity in industrial and automotive-adjacent applications.
FAQ
What is the recommended operating voltage range for SN74AHCT374NSRE4?
The SN74AHCT374NSRE4 is specified to operate reliably from 4.5V to 5.5V VCC. Operation outside this range may cause undefined logic states or exceed absolute maximum ratings. The device draws only 40µA quiescent current at 5.5V, making it suitable for stable 5V rail applications with minimal regulation overhead. Always decouple VCC with a 0.1µF ceramic capacitor placed adjacent to pin 20.
Does SN74AHCT374NSRE4 support true 3-state outputs, and how is output enable controlled?
Yes, SN74AHCT374NSRE4 provides true 3-state outputs controlled by the active-low OE (pin 1) input. When OE is low, all eight Q outputs drive logic-high or logic-low based on stored D-input values; when OE is high, outputs enter high-impedance mode with leakage current ≤ ±2.5µA. OE does not affect internal flip-flop operation-data can be clocked while outputs remain tri-stated.
Can SN74AHCT374NSRE4 interface directly with TTL logic families?
Yes, SN74AHCT374NSRE4 features TTL-compatible inputs with VIH(min) = 2.0V and VIL(max) = 0.8V at VCC = 4.5–5.5V, allowing direct connection to 74LS, 74F, and other standard TTL outputs without level-shifting circuitry. Unused inputs must be terminated to VCC or GND-floating inputs risk oscillation and excess power consumption.
What is the maximum clock frequency supported by SN74AHCT374NSRE4 under typical conditions?
SN74AHCT374NSRE4 supports up to 80MHz maximum clock frequency when loaded with CL = 15pF and operated at VCC = 5V. At CL = 50pF, the maximum usable frequency drops to 75MHz. Timing margins depend on board layout, trace capacitance, and load characteristics-designers should verify setup/hold times (tsu = th = 2.5ns) in their actual signal environment.
Is SN74AHCT374NSRE4 pin-compatible with other members of the '374 family, such as SN74LS374N?
No, SN74AHCT374NSRE4 is not pin-compatible with SN74LS374N. While both are 20-pin DIP/SOIC octal D flip-flops with shared CLK and OE, SN74LS374N uses bipolar TTL technology with different DC characteristics (e.g., higher ICC, asymmetric drive), and its pin 11 is GND whereas SN74AHCT374NSRE4 places GND at pin 11 but assigns CLK to pin 10-requiring PCB redesign for substitution.
SN74AHCT374NSRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 130 MHz
- Max Propagation Delay @ V, Max CL:
- 10.4ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 4 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74AHCT374NSRE4 FAQ
1.How can I place an order for SN74AHCT374NSRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT374NSRE4 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 SN74AHCT374NSRE4 reliable?
The price and inventory of SN74AHCT374NSRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT374NSRE4 is usually 5 days.
3.What payment methods are accepted for SN74AHCT374NSRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT374NSRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT374NSRE4?
SN74AHCT374NSRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT374NSRE4 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 SN74AHCT374NSRE4?
For technical support, including SN74AHCT374NSRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT374NSRE4 requirements.
6.How does Aetrix verify that SN74AHCT374NSRE4 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT374NSRE4 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 SN74AHCT374NSRE4 meets industry standards.
7.What is the process for return or replacement of SN74AHCT374NSRE4?
All SN74AHCT374NSRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT374NSRE4, 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 SN74AHCT374NSRE4 part is unused and in its original packaging.
Return procedure for SN74AHCT374NSRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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