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Texas Instruments SN74HC374DWG4
- Part No.:
- SN74HC374DWG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HC374DWG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,428
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Product details
Overview
SN74HC374DWG4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for bus interface and register applications in 5 V digital systems. It features eight independent D-flip-flops, positive-edge clock triggering, independent output-enable control, ±6 mA drive strength at 5 V, and 14 ns typical propagation delay.
For engineers reviewing the SN74HC374DWG4 datasheet, SN74HC374DWG4 pinout, SN74HC374DWG4 application, or SN74HC374DWG4 equivalent, key selection criteria include 3-state bus driving capability, wide 2–6 V supply range, low 80 µA max ICC, high-current outputs compatible with LSTTL loads, and SOIC-20 packaging suitable for industrial-grade PCB layouts.
Technical Context
The SN74HC374DWG4 implements eight synchronous D-type latches triggered on the rising edge of CLK, with independent OE control enabling high-impedance output states without affecting internal storage. Its CMOS architecture ensures compatibility with TTL input thresholds while delivering rail-to-rail output swing.
Each flip-flop retains data during OE assertion, supporting transparent bus arbitration and hot-swap-safe I/O buffering. The device operates across –40°C to +85°C and supports load capacitances up to 150 pF per output, verified by switching characteristics measured at CL = 50 pF and CL = 150 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - enables direct interfacing with 3.3 V and 5 V logic domains without level shifters |
| Max Propagation Delay (tpd) | 38 ns at 6 V, CL = 50 pF - determines maximum clock frequency (28 MHz) for synchronous register operation |
| Output Drive Strength | ±6 mA at 5 V - drives up to 15 LSTTL loads directly, eliminating external buffers in bus-hold designs |
| Quiescent Current (ICC) | 80 µA max at 6 V - supports low-power standby modes in battery-backed or energy-sensitive systems |
| Input Leakage Current | ±1 µA max - ensures stable logic levels with weak pull-ups/pull-downs and prevents floating-input-induced noise coupling |
| Setup/Hold Times | tsu = 21 ns, th = 5 ns at 6 V - defines minimum data stability window before/after CLK edge for reliable capture |
Pinout & Package
SN74HC374DWG4 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with standard 0.65 mm lead pitch and RoHS-compliant NiPdAu lead finish. The package is rated MSL Level-1 with unlimited floor life at ≤30°C/60% RH.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8 (D1–D8) | Data Inputs | Asynchronous parallel data inputs synchronized to CLK↑; must be stable ≥21 ns before clock edge |
| 9 (GND) | Ground Reference | Common return path for all signals and power; requires low-inductance connection to minimize ground bounce |
| 10–17 (Q1–Q8) | 3-State Outputs | Registered outputs enabled/disabled by OE; high-impedance state isolates bus lines during contention |
| 18 (CLK) | Clock Input | Positive-edge-triggered master clock; accepts 0–6 V swing with 400 ns max rise/fall time at 6 V |
| 19 (OE) | Output Enable | Active-low control: OE = L enables Q outputs; OE = H forces all Q into high-Z; no effect on internal latch state |
| 20 (VCC) | Power Supply | Primary supply rail (2–6 V); requires local 0.1 µF ceramic bypass capacitor placed within 3 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type flip-flop structure | Eight independent registers in one IC reduce board space and interconnect complexity vs discrete solutions |
| 3-state output control | OE pin allows dynamic bus sharing without external tri-state logic or direction control signals |
| High-current CMOS outputs | ±6 mA drive at 5 V eliminates need for buffer stages when interfacing with legacy TTL or capacitive buses |
| Low static power consumption | 80 µA max ICC enables use in always-on subsystems where leakage current impacts battery life or thermal budget |
| Wide voltage operation (2–6 V) | Single part supports mixed-voltage designs-e.g., 3.3 V MCU core with 5 V peripheral bus-without translation |
Applications
| Buffer Register | I/O Port Interface |
|---|---|
Use Scenario: Holding data between asynchronous system blocks, such as CPU-to-peripheral handshaking or FIFO staging. IC Role / Device Role / Timing Role: Edge-triggered register capturing parallel data on CLK↑; OE controls bus release timing. Use Value: Prevents metastability and race conditions during data transfer; 3-state outputs eliminate bus contention during read/write cycles. | Use Scenario: Expanding microcontroller GPIO count for driving LEDs, relays, or sensors in industrial PLC modules. IC Role / Device Role / Timing Role: Parallel output latch with configurable enable; decouples MCU timing from load switching transients. Use Value: ±6 mA drive directly powers indicator LEDs or small solenoids; high-impedance mode supports shared bus diagnostics. |
| Bidirectional Bus Driver | Working Register |
Use Scenario: Isolating and controlling data flow on a shared 8-bit data bus between multiple masters (e.g., MCU + FPGA). IC Role / Device Role / Timing Role: Direction-agnostic 3-state buffer; OE synchronizes bus access; CLK captures incoming data. Use Value: Eliminates need for separate transceivers or direction-control logic; reduces BOM count and layout area. | Use Scenario: Temporary storage of intermediate computation results in embedded signal processing pipelines. IC Role / Device Role / Timing Role: Synchronous latch holding pipeline stage outputs; retained during OE assertion for multi-cycle operations. Use Value: Enables pipelined execution without memory access latency; low 80 µA ICC minimizes power overhead per stage. |
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 |
|---|---|---|---|
| SN74HCT374N | TTL-compatible input thresholds (VIH = 2 V min), same pinout and function | Better suited for mixed 5 V TTL/CMOS systems where input noise immunity is critical | Select when interfacing with legacy 5 V TTL outputs; otherwise SN74HC374DWG4 offers lower ICC and wider VCC range |
| 74LCX374MTCX | Lower VCC range (2–3.6 V), higher speed (tpd = 5.5 ns @ 3.3 V), TSSOP-20 package | Optimized for 3.3 V-only portable or low-voltage logic; not 5 V tolerant | Choose for 3.3 V systems requiring faster timing; avoid if 5 V operation or backward compatibility needed |
Compared with SN74HCT374N and 74LCX374MTCX, the SN74HC374DWG4 provides the broadest supply flexibility (2–6 V), lowest quiescent power, and proven industrial temperature reliability in SOIC packaging-making it optimal for general-purpose 5 V register and bus interface tasks.
Availability
SN74HC374DWG4 is available at Aetrix Electronics and suitable for industrial control panels, test equipment interfaces, and embedded data acquisition systems requiring stable component supply and long-term manufacturability.
Supply support for SN74HC374DWG4 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 over 50 years of innovation in high-reliability digital ICs.
The SN74HC374DWG4 belongs to TI's industry-standard 74HC logic family, engineered for robust performance in industrial, automotive, and communications infrastructure applications requiring precise timing, noise immunity, and long-lifecycle support.
FAQ
What is the maximum clock frequency supported by SN74HC374DWG4 at 5 V?
At VCC = 5 V and TA = 25°C, the SN74HC374DWG4 supports a maximum clock frequency of 24 MHz under recommended operating conditions. This value is derived from timing requirements specifying minimum CLK pulse width (tw = 20 ns) and verified by switching characteristics tables showing fmax = 24 MHz at CL = 50 pF. Operation above this frequency risks setup/hold violations and metastability.
Does SN74HC374DWG4 require external pull-up resistors on the OE pin?
Yes, to ensure the outputs remain in high-impedance state during power-up or power-down, OE should be tied to VCC through a pull-up resistor. TI recommends using a resistor value determined by the current-sinking capability of the driver-typically 10 kΩ suffices for most applications. Leaving OE floating may cause undefined output states and bus contention.
Can SN74HC374DWG4 operate reliably at 3.3 V supply voltage?
Yes, SN74HC374DWG4 is fully specified for operation from 2 V to 6 V, including 3.3 V. At 3.3 V, it delivers ±4 mA output drive, 25 ns typical tpd, and maintains full logic threshold compatibility (VIH = 2.31 V min, VIL = 1.09 V max). All AC and DC parameters in the datasheet are guaranteed across this range.
What is the thermal resistance (RθJA) of SN74HC374DWG4 in its SOIC package?
The junction-to-ambient thermal resistance (RθJA) for SN74HC374DWG4 in the DW (SOIC-20) package is 109.1°C/W, as specified in the April 2022 revision of the datasheet. This value assumes standard JEDEC 2-layer board conditions and informs thermal design margins for continuous operation at elevated ambient temperatures.
How does the 3-state output behavior of SN74HC374DWG4 differ from standard push-pull outputs?
Unlike push-pull outputs that actively drive high or low, SN74HC374DWG4's 3-state outputs enter a high-impedance (Hi-Z) state when OE is high-disconnecting the output from the bus electrically. This allows multiple devices to share a common bus without contention, enabling bidirectional data routing and dynamic bus arbitration without external isolation components.
SN74HC374DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 70 MHz
- Max Propagation Delay @ V, Max CL:
- 31ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HC374DWG4 FAQ
1.How can I place an order for SN74HC374DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC374DWG4 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 SN74HC374DWG4 reliable?
The price and inventory of SN74HC374DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC374DWG4 is usually 5 days.
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SN74HC374DWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC374DWG4 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 SN74HC374DWG4?
For technical support, including SN74HC374DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC374DWG4 requirements.
6.How does Aetrix verify that SN74HC374DWG4 is sourced from the original manufacturer or authorized distributors?
All SN74HC374DWG4 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 SN74HC374DWG4 meets industry standards.
7.What is the process for return or replacement of SN74HC374DWG4?
All SN74HC374DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC374DWG4, 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 SN74HC374DWG4 part is unused and in its original packaging.
Return procedure for SN74HC374DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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