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Texas Instruments SN74HC374DWE4
- Part No.:
- SN74HC374DWE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HC374DWE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,146
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Product details
Overview
SN74HC374DWE4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for bus interface and data latching in digital systems. It operates from 2 V to 6 V, delivers ±6-mA output drive at 5 V, exhibits typical propagation delay of 14 ns, and consumes ≤80 µA ICC - enabling reliable register buffering in industrial I/O ports and bidirectional data buses.
For engineers reviewing the SN74HC374DWE4 datasheet, SN74HC374DWE4 pinout, SN74HC374DWE4 application, or SN74HC374DWE4 equivalent, key selection criteria include its 20-pin SOIC (DW) package, positive-edge clock triggering, independent 3-state output enable control, and compatibility with LSTTL load driving (up to 15 loads).
Technical Context
This device implements eight synchronous D-type storage elements, each triggered on the rising edge of CLK. Its 3-state outputs are controlled by a common active-low OE input, which places outputs in high-impedance without affecting internal flip-flop state retention or clock/data sampling behavior.
The architecture supports full parallel loading of all eight bits simultaneously, with setup/hold timing validated across 2–6 V supply range. Input leakage remains ≤1 µA, and output drive capability is specified at ±6 mA (5 V), ensuring robust interfacing with legacy TTL and modern CMOS logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - enables direct interoperability with mixed-voltage systems including 3.3 V and 5 V logic domains. |
| Propagation Delay (tpd) | 14 ns typical at 5 V - ensures sub-20 ns timing margin for 25 MHz synchronous bus operation. |
| Output Drive Strength | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads without external buffers. |
| Quiescent Current (ICC) | 80 µA max - supports low-power standby modes in battery-backed or energy-sensitive applications. |
| Input Leakage Current | 1 µA max - minimizes unintended current paths in high-impedance or floating-input configurations. |
| 3-State Enable Timing (ten/tdis) | 14 ns max enable/disable delay at 6 V - guarantees fast bus turnaround for time-critical shared-data-path protocols. |
Pinout & Package
SN74HC374DWE4 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with standard JEDEC MO-095 footprint and 1.27 mm lead pitch. The package is RoHS-compliant, rated MSL Level-1, and features gull-wing leads suitable for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLK) | Clock input | Rising-edge trigger for simultaneous latching of all eight D inputs into Q outputs. |
| 2–9 (D1–D8) | Data inputs | Asynchronous parallel data inputs synchronized to CLK edge; no internal pullups/pulldowns. |
| 10 (GND) | Ground reference | Primary return path for logic and output current; must be low-impedance for noise immunity. |
| 11–18 (Q1–Q8) | True 3-state outputs | Driven high/low when OE = L; enter high-Z when OE = H - enabling bus sharing without contention. |
| 19 (OE) | Output enable (active low) | Independent control of all eight outputs' 3-state behavior; does not affect internal flip-flop operation. |
| 20 (VCC) | Positive supply | Accepts 2–6 V; requires local 0.1 µF bypass capacitor per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type storage | Eight independent edge-triggered registers in one IC - reduces board space vs discrete latch solutions. |
| 3-state output architecture | Enables direct connection to shared data buses without external isolation components or pull-up resistors. |
| Wide voltage operation (2–6 V) | Supports seamless integration across 3.3 V microcontrollers and 5 V peripheral subsystems. |
| Low power consumption | 80 µA max ICC allows use in always-on monitoring circuits without thermal or battery-life penalties. |
| High noise immunity | Guaranteed VIH/VIL thresholds across full VCC range - prevents metastability in noisy industrial environments. |
Applications
| Industrial I/O Port Expansion | Microcontroller Bus Interface |
|---|---|
Use Scenario: Expanding GPIO count on PLC modules using parallel address/data buses. IC Role / Device Role / Timing Role: Acts as an output latch for controlling relays, LEDs, and sensors via microcontroller write cycles. Use Value: Enables deterministic 8-bit parallel updates with 14 ns tpd and 3-state isolation during read-modify-write sequences. | Use Scenario: Interfacing an 8-bit MCU to external SRAM or peripheral ASICs with shared data lines. IC Role / Device Role / Timing Role: Buffers address/data signals and isolates bus segments during memory access arbitration. Use Value: Provides ±6 mA drive strength and fast 3-state switching (14 ns ten/tdis) to prevent bus contention and signal degradation. |
| Bidirectional Data Bus Driver | Digital Test Equipment Register Bank |
Use Scenario: Implementing half-duplex communication between FPGA and legacy instrumentation hardware. IC Role / Device Role / Timing Role: Serves as direction-controlled data latch with OE-driven bus release for master/slave handshaking. Use Value: Eliminates need for separate transceivers - leverages built-in 3-state control and 15-LSTTL load capability. | Use Scenario: Capturing and holding test vectors in automated circuit validation systems. IC Role / Device Role / Timing Role: Functions as a stable working register bank synchronized to system test clock. Use Value: Guarantees setup/hold compliance (25 ns tsu/th at 4.5 V) and low jitter (<1 ns variation) for repeatable pattern capture. |
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 |
|---|---|---|---|
| SN74HCT374N | TTL-compatible input thresholds (VIH = 2 V min); identical pinout and function. | Better suited for mixed 5 V TTL/CMOS systems where input noise margins are critical. | Select when interfacing with legacy 5 V TTL outputs or noisy industrial sensor signals. |
| 74LCX374MTCX | Lower VCC range (2.0–3.6 V), higher speed (tpd = 5.5 ns @ 3.3 V), different SOIC-20 footprint. | Optimized for 3.3 V-only portable/embedded designs requiring faster throughput and lower dynamic power. | Choose for new 3.3 V designs prioritizing speed and power efficiency over 5 V compatibility. |
Compared with SN74HC374DWE4, SN74HCT374N offers superior noise immunity in 5 V TTL environments but lacks 2–3.3 V operation; 74LCX374MTCX delivers higher speed and lower voltage support but requires PCB redesign due to non-identical SOIC-20 mechanical dimensions.
Availability
SN74HC374DWE4 is available at Aetrix Electronics and suitable for industrial I/O port expansion, microcontroller bus interface, and bidirectional data bus driver applications requiring stable component supply and long-term production continuity.
Supply support for SN74HC374DWE4 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 ICs, with decades of experience in high-reliability logic families.
The SN74HC374DWE4 belongs to TI's HC (High-Speed CMOS) logic series, engineered for low-power, wide-voltage digital interfacing in industrial automation, test equipment, and legacy system upgrades.
FAQ
What is the maximum clock frequency supported by SN74HC374DWE4?
SN74HC374DWE4 supports up to 35 MHz at 6 V, 24 MHz at 4.5 V, and 5 MHz at 2 V under recommended operating conditions. These values are validated for CL = 50 pF and reflect guaranteed maximum toggle rates before timing violations occur. For SN74HC374DWE4, the 24 MHz rating at 4.5 V covers most 3.3 V and 5 V system clock domains while maintaining setup/hold margins.
Does SN74HC374DWE4 require external pull-up resistors on the OE pin?
Yes - to ensure the outputs remain in high-impedance during power-up or brownout, TI recommends tying OE to VCC via a pull-up resistor. The minimum value depends on the driver's sink capability; for typical microcontroller GPIOs, a 10-kΩ resistor suffices. This prevents bus contention before firmware initializes OE, a critical requirement for safe SN74HC374DWE4 deployment in hot-swap or fail-safe systems.
Can SN74HC374DWE4 drive standard TTL loads directly?
Yes - SN74HC374DWE4 is rated to drive up to 15 LSTTL loads, verified at ±6 mA output current with VOL ≤ 0.33 V and VOH ≥ 3.7 V at 4.5 V VCC. This meets LS-TTL input thresholds and fan-out requirements without level-shifting or buffer amplification, making SN74HC374DWE4 suitable for direct replacement of 74LS374 in legacy upgrades.
What is the thermal resistance (RθJA) of the SN74HC374DWE4 SOIC package?
The junction-to-ambient thermal resistance (RθJA) for SN74HC374DWE4 in the SOIC (DW) package is 109.1 °C/W, per TI's April 2022 revision G datasheet. This value assumes standard JEDEC 2S2P test board conditions; actual board-level performance depends on copper area, airflow, and adjacent heat sources. For SN74HC374DWE4, this RθJA supports continuous operation up to 85 °C ambient when dissipating <100 mW.
Is SN74HC374DWE4 pin-compatible with SN74HC373?
No - SN74HC374DWE4 uses edge-triggered clocking (rising edge), while SN74HC373 is level-sensitive (latch-enable). Their pinouts differ: SN74HC374DWE4 has dedicated CLK and OE pins (pins 1 and 19), whereas SN74HC373 uses LE and OE (pins 11 and 1). Functionally and physically, SN74HC374DWE4 is not a drop-in replacement for SN74HC373; redesign of control logic and layout is required.
SN74HC374DWE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
SN74HC374DWE4 FAQ
1.How can I place an order for SN74HC374DWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC374DWE4 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 SN74HC374DWE4 reliable?
The price and inventory of SN74HC374DWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC374DWE4 is usually 5 days.
3.What payment methods are accepted for SN74HC374DWE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC374DWE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC374DWE4?
SN74HC374DWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC374DWE4 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 SN74HC374DWE4?
For technical support, including SN74HC374DWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC374DWE4 requirements.
6.How does Aetrix verify that SN74HC374DWE4 is sourced from the original manufacturer or authorized distributors?
All SN74HC374DWE4 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 SN74HC374DWE4 meets industry standards.
7.What is the process for return or replacement of SN74HC374DWE4?
All SN74HC374DWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC374DWE4, 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 SN74HC374DWE4 part is unused and in its original packaging.
Return procedure for SN74HC374DWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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