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Texas Instruments SN74HC374DW
- Part No.:
- SN74HC374DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HC374DW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,291
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Product details
Overview
SN74HC374DW 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 across 2 V to 6 V, delivers ±6-mA output drive at 5 V, features 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 SN74HC374DW datasheet, SN74HC374DW pinout, SN74HC374DW application, or SN74HC374DW equivalent, key selection criteria include its 20-pin SOIC (DW) package, positive-edge clock triggering, independent 3-state control via OE, and compatibility with LSTTL load driving (up to 15 units).
Technical Context
The SN74HC374DW implements eight synchronous D-type flip-flops sharing a common clock (CLK) and output-enable (OE) signal. Each flip-flop captures D-input logic on the rising edge of CLK and holds state until the next active clock transition, while OE independently places all Q outputs into high-impedance mode without affecting internal storage.
This architecture supports parallel data loading and bus isolation in microcontroller peripheral interfaces, where timing-critical hold/setup requirements (e.g., tsu = 25 ns min at 4.5 V) and low-power operation (ICC ≤ 80 µA) are essential for stable register staging in embedded control subsystems.
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 families without level translation. |
| Propagation Delay (tpd) | 14 ns typical at 5 V - ensures sub-20 ns timing margin for 25 MHz system clocks in synchronous data capture. |
| Output Drive Strength | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads, eliminating need for external buffer stages. |
| Quiescent Current (ICC) | 80 µA maximum - supports low-power standby modes in battery-backed or energy-sensitive applications. |
| Input Leakage Current | 1 µA maximum - minimizes unintended biasing on unused inputs, simplifying pull-up/down resistor selection. |
| 3-State Enable Timing (ten/tdis) | 38 ns max enable/disable at 5 V - guarantees clean bus release before subsequent data cycles in shared-memory architectures. |
Pinout & Package
SN74HC374DW is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with standard JEDEC MO-153 footprint and 1.27 mm lead pitch. The package is RoHS-compliant, rated for –40°C to +85°C operation, and qualified for surface-mount reflow per Level-1-260°C MSL rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8 (D1–D8) | Data Inputs | Asynchronous parallel data inputs latched on CLK rising edge; must be held stable ≥25 ns before clock (tsu) and ≥5 ns after (th). |
| 9 (GND) | Ground Reference | Common return path for all internal logic and output drivers; requires low-inductance connection to PCB ground plane. |
| 10–17 (Q1–Q8) | 3-State Outputs | Registered outputs placed in high-Z when OE = high; sink/source up to ±6 mA when enabled and loaded. |
| 18 (CLK) | Clock Input | Positive-edge-triggered master clock; input transition time ≤500 ns at 4.5 V ensures reliable edge detection. |
| 19 (OE) | Output Enable | Active-low control: OE = low enables outputs; OE = high forces all Q pins to high-impedance regardless of CLK or D state. |
| 20 (VCC) | Power Supply | Primary supply rail; requires local 0.1 µF ceramic bypass capacitor placed within 5 mm of pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type flip-flop structure | Eight independent registers in one IC reduce board space vs. discrete 74HC74 implementations and simplify routing of parallel data paths. |
| 3-state outputs with independent OE | Enables bidirectional bus arbitration without external transceivers - critical for microcontroller GPIO expansion and memory-mapped I/O. |
| Wide 2–6 V supply range | Supports mixed-voltage system design: interoperability with both 3.3 V controllers and legacy 5 V peripherals without voltage translators. |
| Low power consumption (≤80 µA ICC) | Reduces thermal load in dense logic arrays and extends battery life in portable instrumentation using buffered sensor data paths. |
| High noise immunity (VIH/VIL thresholds) | Guaranteed 3.15 V VIH and 1.35 V VIL at 4.5 V supply - prevents false triggering from EMI or crosstalk in industrial control cabinets. |
Applications
| Industrial I/O Expansion | Microcontroller Bus Interface |
|---|---|
Use Scenario: Adding parallel digital I/O capability to PLC modules using limited MCU GPIO resources. IC Role / Device Role / Timing Role: Acts as an output latch and input buffer, synchronizing asynchronous field signals to the controller's clock domain via CLK and isolating bus traffic using OE. Use Value: Enables deterministic sampling of 8-bit sensor status words at 25 MHz while preventing bus contention during firmware updates. | Use Scenario: Interfacing an 8-bit microcontroller to external SRAM or EPROM with shared address/data bus. IC Role / Device Role / Timing Role: Functions as an address latch (using D→Q path) and data bus transceiver (via 3-state control), decoupling slow memory access from CPU timing. Use Value: Eliminates need for separate 74HC573 and 74HC245 chips, reducing BOM count and layout complexity in cost-sensitive embedded designs. |
| Test Equipment Signal Conditioning | Digital Logic Education Platform |
Use Scenario: Capturing and holding test vectors in automated boundary-scan or functional test fixtures. IC Role / Device Role / Timing Role: Serves as a programmable pattern register, storing stimulus data from FPGA sequencer and releasing it synchronously to DUT pins under OE control. Use Value: Provides precise setup/hold timing (tsu/th = 25/5 ns) required for 40 MHz digital stimulus generation with minimal jitter accumulation. | Use Scenario: Teaching synchronous sequential logic concepts in university labs using breadboard-based digital systems. IC Role / Device Role / Timing Role: Demonstrates edge-triggered storage, bus contention avoidance, and clock-domain crossing fundamentals via manual push-button CLK and D inputs. Use Value: Offers visible LED feedback on Q outputs and robust noise immunity - allowing students to observe metastability effects and 3-state behavior without oscilloscope dependency. |
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 |
|---|---|---|---|
| SN74HCT374DW | TTL-compatible input thresholds (VIH = 2 V min); identical pinout and timing. | Better interoperability with legacy 5 V TTL logic; slightly higher ICC (160 µA max). | Select when interfacing with 74LS or 74F series without level shifters. |
| SN74LVC374APWR | 3.3 V only (1.65–3.6 V), TSSOP-20 package, faster tpd = 5.2 ns typical. | Optimized for modern low-voltage SoC interfaces; not compatible with 5 V systems. | Choose for high-speed, low-power applications where supply is strictly 3.3 V and board space is constrained. |
Compared with SN74HC374DW, SN74HCT374DW offers guaranteed TTL input compatibility at the cost of higher static current, while SN74LVC374APWR provides superior speed and density in 3.3 V domains but sacrifices 5 V tolerance and SOIC mounting familiarity.
Availability
SN74HC374DW is available at Aetrix Electronics and suitable for industrial I/O expansion, microcontroller bus interface, and test equipment signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for SN74HC374DW 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 industrial, automotive, and communications markets.
The SN74HC374DW belongs to TI's 74HC logic family, engineered for high-noise-immunity, low-power, and wide-voltage-operation digital interfacing - targeting robustness in factory automation, test instrumentation, and educational hardware platforms.
FAQ
What is the maximum clock frequency supported by SN74HC374DW at 5 V?
The SN74HC374DW supports a maximum clock frequency of 24 MHz at 5 V supply under recommended operating conditions. This value is derived from timing specifications in the official TI datasheet (SCLS141G, Rev G), where fmax = 24 MHz is specified for SN74HC374 devices at VCC = 4.5 V to 6 V and TA = –40°C to +85°C. Operation beyond this limit risks setup/hold violations and metastability.
Does SN74HC374DW require external pull-up resistors on the OE pin?
Yes, SN74HC374DW requires a pull-up resistor on the OE pin to ensure high-impedance outputs during power-up or power-down sequences. TI recommends connecting OE to VCC through a resistor sized to accommodate the driver's current-sinking capability - typically 10 kΩ for most applications - to prevent bus contention before firmware initializes the control signal.
Can SN74HC374DW drive LEDs directly without current-limiting resistors?
No, SN74HC374DW cannot safely drive LEDs directly without series current-limiting resistors. Its outputs provide ±6 mA at 5 V, which exceeds typical LED forward current ratings (e.g., 2–20 mA). Connecting an LED directly risks exceeding absolute maximum output current (±35 mA) and damaging the output stage. A minimum 330 Ω resistor is required for standard 5 V, 2 mA LED operation.
Is SN74HC374DW pin-compatible with SN74HC574N?
No, SN74HC374DW is not pin-compatible with SN74HC574N. Although both are octal D-type flip-flops, SN74HC574N uses a different pinout: its OE is active-high and located on pin 11, whereas SN74HC374DW has active-low OE on pin 19. Additionally, SN74HC574N lacks 3-state outputs on Q pins - all outputs are always active - making direct substitution electrically unsafe without PCB redesign.
What is the thermal resistance (RθJA) of SN74HC374DW in its SOIC package?
The junction-to-ambient thermal resistance (RθJA) of SN74HC374DW in the SOIC (DW) package is 109.1 °C/W, as specified in Section 5.3 of the TI datasheet (SCLS141G, Rev G). This value assumes standard JEDEC 2-layer board conditions and is critical for calculating maximum allowable power dissipation (Pd = (TJmax – TA)/RθJA) in thermally constrained layouts.
SN74HC374DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 70 MHz
- Max Propagation Delay @ V, Max CL:
- 15ns @ 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
SN74HC374DW FAQ
1.How can I place an order for SN74HC374DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC374DW 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 SN74HC374DW reliable?
The price and inventory of SN74HC374DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC374DW is usually 5 days.
3.What payment methods are accepted for SN74HC374DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC374DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC374DW?
SN74HC374DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC374DW 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 SN74HC374DW?
For technical support, including SN74HC374DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC374DW requirements.
6.How does Aetrix verify that SN74HC374DW is sourced from the original manufacturer or authorized distributors?
All SN74HC374DW 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 SN74HC374DW meets industry standards.
7.What is the process for return or replacement of SN74HC374DW?
All SN74HC374DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC374DW, 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 SN74HC374DW part is unused and in its original packaging.
Return procedure for SN74HC374DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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