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Texas Instruments SN74AHCT374NSRG4
- Part No.:
- SN74AHCT374NSRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74AHCT374NSRG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,834
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Product details
Overview
SN74AHCT374NSRG4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for parallel data latching and bus interfacing in 5V digital systems. It operates at 4.5–5.5V VCC, delivers 10.5ns propagation delay (CL = 15pF), supports up to 80MHz clock frequency, and features TTL-compatible inputs - used in industrial control I/O expansion and synchronous data capture.
For engineers reviewing the SN74AHCT374NSRG4 datasheet, SN74AHCT374NSRG4 pinout, SN74AHCT374NSRG4 application, or SN74AHCT374NSRG4 equivalent, key selection criteria include its rising-edge clock trigger, active-low 3-state output enable (OE), flow-through pinout for simplified PCB routing, and robust latch-up immunity (>250mA per JESD17).
Technical Context
The SN74AHCT374NSRG4 implements eight independent D-type flip-flops sharing a single rising-edge-sensitive CLK input and a common active-low OE control signal. Its CMOS-based architecture ensures TTL-compatible input thresholds (VIH = 2V, VIL = 0.8V at VCC = 4.5–5.5V) while delivering rail-to-rail 3-state outputs capable of sourcing/sinking ±25mA.
Timing behavior is defined by strict setup (tsu = 2.5ns) and hold (th = 2.5ns) requirements relative to CLK↑, with propagation delays tPLH/tPHL ≤ 10.5ns and output enable/disable delays (tPZH/tPLZ ≤ 11.5ns) measured at CL = 15pF - enabling reliable operation in high-speed synchronous buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - ensures compatibility with standard 5V TTL/CMOS logic rails and stable operation across industrial supply tolerances. |
| Propagation Delay (tPD) | 10.5ns max at VCC = 5V, CL = 15pF - enables reliable timing closure in 80MHz synchronous systems with margin. |
| Max Clock Frequency | 80MHz at CL = 15pF - supports high-throughput data capture in parallel interfaces such as memory-mapped I/O or FPGA peripheral bridging. |
| Output Drive | ±25mA continuous per output - sufficient to drive multiple 74-series loads or terminate short PCB traces without external buffers. |
| Input Compatibility | TTL-compatible (VIH = 2V, VIL = 0.8V) - allows direct interfacing with legacy 5V TTL outputs without level-shifting circuitry. |
| Latch-up Immunity | >250mA per JESD17 - provides robust protection against transient current faults in noisy industrial environments. |
| Operating Temperature | –40°C to +85°C - qualified for extended-temperature industrial applications including motor control and PLC modules. |
Pinout & Package
VQFN-20 (RKS) package: 4.5mm × 2.5mm body, wettable flank leads, exposed thermal pad (optional GND connection). Flow-through pinout minimizes trace crossovers on dense PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low 3-state enable | Drives all eight Q outputs into high-impedance when low; no effect on internal flip-flop state - enables shared-bus arbitration. |
| 2–9, 12, 15–16, 19 (Q1–Q8) | Registered data outputs | Reflect D-input values sampled on CLK↑; tri-stated when OE = high - eliminates bus contention during data transfers. |
| 3–4, 7–8, 13–14, 17–18 (D1–D8) | Asynchronous data inputs | Sampled only on CLK↑ rising edge; must be stable ≥2.5ns before and ≥2.5ns after clock transition - defines minimum data setup/hold window. |
| 10 (CLK) | Rising-edge clock input | Synchronizes all eight flip-flops simultaneously; edge-triggered behavior prevents metastability propagation across channels. |
| 11 (GND) | Ground reference | Primary return path for output sink current and internal logic - requires low-impedance plane connection for noise immunity. |
| 20 (VCC) | Positive supply | Supplies power for both logic core and output drivers; requires local 0.1µF bypass capacitor to suppress switching noise. |
| Thermal Pad | Exposed die attach pad | Improves thermal dissipation; may be connected to GND plane for enhanced EMI performance and junction temperature reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Balanced CMOS 3-state outputs | Equal ±25mA drive capability ensures symmetrical rise/fall times and predictable bus loading in bidirectional configurations. |
| TTL-compatible inputs | VIH = 2V / VIL = 0.8V thresholds allow seamless integration with legacy 5V TTL sources without external biasing. |
| Flow-through pinout | D- and Q-pins arranged to support straight-line PCB routing between microcontroller GPIO banks and peripheral buses - reduces layer count. |
| High noise immunity | Dynamic noise margins: VOL(P) ≤ 1.2V, VOH(V) ≥ 3.8V at 5V - suppresses false triggering in electrically noisy factory-floor environments. |
| Low static power consumption | ICC ≤ 40µA at VCC = 5.5V - enables use in always-on industrial monitoring nodes without thermal derating concerns. |
Applications
| Parallel Data Synchronization | Parallel Data Storage |
|---|---|
|
Use Scenario: Capturing real-time sensor readings from an 8-bit ADC interface synchronized to a system clock domain. IC Role / Device Role / Timing Role: Edge-triggered register holding sampled data until host processor initiates read cycle via OE control. Use Value: Eliminates metastability risk during clock-domain crossing and provides deterministic sampling aligned to system timing reference. |
Use Scenario: Holding configuration bits for a programmable logic controller (PLC) I/O module during firmware update sequences. IC Role / Device Role / Timing Role: Non-volatile latch maintaining output states while main controller reboots or reloads configuration. Use Value: Prevents spurious actuator activation or relay toggling during system initialization or recovery phases. |
| Shift Register Building Block | Pattern Generator Interface |
|
Use Scenario: Cascading multiple SN74AHCT374NSRG4 devices to construct a 32-bit serial-in/parallel-out shift register for LED matrix control. IC Role / Device Role / Timing Role: Synchronized stage in multi-chip shift chain; CLK and OE driven in unison to advance data through pipeline. Use Value: Enables precise timing alignment across 32 output bits with single-clock edge control - critical for flicker-free display updates. |
Use Scenario: Providing stable parallel address/data outputs from a microcontroller to a test equipment pattern generator IC. IC Role / Device Role / Timing Role: Output buffer isolating MCU GPIOs from capacitive load of test fixture wiring and ensuring clean signal edges. Use Value: Maintains signal integrity at 80MHz edge rates over 15cm cables, reducing jitter and bit-error rate in automated test systems. |
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 |
|---|---|---|---|
| SN74AHCT574PW | Same VCC range and pinout but uses separate OE per group (two 4-bit sections); higher ICC (60µA vs 40µA). | Preferred where independent control of two 4-bit data lanes is required - e.g., dual-port memory interface. | Select SN74AHCT574PW only if grouped output control is needed; otherwise SN74AHCT374NSRG4 offers simpler OE management. |
| 74LVX374M | Lower VCC range (2.7–3.6V); 3.3V-only operation; faster tPD (7.5ns) but reduced drive (±24mA). | Targeted at 3.3V systems with tighter timing budgets - not interoperable with 5V buses without level translation. | Choose 74LVX374M for 3.3V domains requiring sub-8ns latency; avoid in mixed-voltage or legacy 5V designs. |
Compared with SN74AHCT574PW and 74LVX374M, the SN74AHCT374NSRG4 uniquely balances 5V compatibility, unified 3-state control, and industrial temperature rating - making it optimal for cost-sensitive, single-bus industrial I/O expansion where voltage and timing constraints align with 4.5–5.5V operation.
Availability
SN74AHCT374NSRG4 is available at Aetrix Electronics and suitable for industrial automation controllers, programmable logic controller (PLC) modules, and test equipment requiring stable component supply with guaranteed long-term manufacturability.
Supply support for SN74AHCT374NSRG4 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 experience in high-reliability industrial and automotive-grade components.
The SN74AHCT374NSRG4 belongs to TI's AHCT logic family, engineered for robust 5V operation with TTL compatibility and enhanced noise immunity - targeting industrial control, instrumentation, and legacy-system interface applications.
FAQ
What is the maximum clock frequency supported by the SN74AHCT374NSRG4?
The SN74AHCT374NSRG4 supports up to 80MHz operation under recommended conditions (VCC = 5V, CL = 15pF). This value is verified in the Switching Characteristics table (fmax = 80MHz min) and reflects guaranteed timing performance across the full industrial temperature range (–40°C to +85°C), not just typical lab conditions.
Does the SN74AHCT374NSRG4 require external pull-up resistors on unused inputs?
Yes - all unused inputs of the SN74AHCT374NSRG4 must be terminated to either VCC or GND to prevent floating states that cause excessive power consumption or oscillation. A 10kΩ pull-up or pull-down resistor is recommended per unused input, as specified in TI's Implications of Slow or Floating CMOS Inputs application report.
Can the SN74AHCT374NSRG4 drive a 50pF capacitive load reliably?
Yes - the SN74AHCT374NSRG4 is fully characterized for CL = 50pF in its Switching Characteristics table, with tPLH/tPHL ≤ 11.5ns and tPZH/tPLZ ≤ 12.5ns. Driving 50pF loads remains within datasheet specifications, though performance margin is reduced versus the 15pF condition; layout best practices (short traces, ground planes) are advised.
Is the thermal pad on the SN74AHCT374NSRG4 package required to be connected to ground?
No - the exposed thermal pad on the SN74AHCT374NSRG4 (RKS package) may be connected to GND or left floating, per the Pin Functions table. TI recommends grounding it to improve thermal dissipation and EMI performance, but it is not electrically mandatory; connection to any other signal or supply is prohibited.
How does the SN74AHCT374NSRG4 handle power-up sequencing when OE is uncontrolled?
To ensure high-impedance outputs during power-up, OE should be tied to VCC through a pull-up resistor - minimum value determined by driver sink capability. The SN74AHCT374NSRG4 does not include internal power-on reset; uncontrolled OE may result in undefined output states until OE stabilizes, risking bus contention in multi-device systems.
SN74AHCT374NSRG4 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
SN74AHCT374NSRG4 FAQ
1.How can I place an order for SN74AHCT374NSRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT374NSRG4 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 SN74AHCT374NSRG4 reliable?
The price and inventory of SN74AHCT374NSRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT374NSRG4 is usually 5 days.
3.What payment methods are accepted for SN74AHCT374NSRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT374NSRG4 transactions.
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4.How is shipping managed for SN74AHCT374NSRG4?
SN74AHCT374NSRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT374NSRG4 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 SN74AHCT374NSRG4?
For technical support, including SN74AHCT374NSRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT374NSRG4 requirements.
6.How does Aetrix verify that SN74AHCT374NSRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT374NSRG4 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 SN74AHCT374NSRG4 meets industry standards.
7.What is the process for return or replacement of SN74AHCT374NSRG4?
All SN74AHCT374NSRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT374NSRG4, 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 SN74AHCT374NSRG4 part is unused and in its original packaging.
Return procedure for SN74AHCT374NSRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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