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Texas Instruments SN74HCT374DW
- Part No.:
- SN74HCT374DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HCT374DW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,381
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Product details
Overview
SN74HCT374DW from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, operating at 4.5 V to 5.5 V supply voltage, featuring ±6-mA output drive at 5 V, 22-ns typical propagation delay, and TTL-compatible inputs. It serves as a bus-oriented register in digital systems requiring parallel data latching and bidirectional bus isolation.
For engineers reviewing the SN74HCT374DW datasheet, SN74HCT374DW pinout, SN74HCT374DW application, or SN74HCT374DW equivalent, key selection criteria include positive-edge clock triggering, independent output-enable control, high-current 3-state outputs capable of driving 15 LSTTL loads, and SOIC-20 packaging for industrial-grade PCB integration.
Technical Context
The SN74HCT374DW implements eight synchronous D-type flip-flops sharing a common clock (CLK) and output-enable (OE) signal. Each flip-flop captures D-input logic levels on the rising edge of CLK and holds state until the next active clock transition.
OE controls all eight Q outputs simultaneously, placing them in either active high/low logic states or high-impedance mode-enabling bidirectional bus operation without external pull-ups or interface components. Input thresholds are TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V), and internal logic remains functional regardless of OE state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and CMOS logic rails |
| Propagation Delay (tpd) | 22 ns typical at 5 V, CL = 50 pF - supports 25 MHz maximum clock frequency in commercial temperature range |
| Output Drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads without buffering |
| Input Current | ≤1 μA max - minimizes loading on upstream logic and enables high fan-out without signal degradation |
| Quiescent ICC | 80 μA max - enables low-static-power operation in always-on register applications |
| Setup/Hold Times | tsu = 25 ns, th = 10 ns at 5 V - defines minimum data stability window before and after CLK rising edge |
| 3-State Enable/Disable | ten = 38 ns, tdis = 34 ns at 5 V, CL = 50 pF - determines bus turnaround latency during direction switching |
Pinout & Package
SN74HCT374DW is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm with 1.27-mm lead pitch and 2.65-mm maximum height. The package is RoHS-compliant, moisture-sensitive level 1, and rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8 (D1–D8) | Data inputs | Asynchronous parallel data inputs synchronized to CLK rising edge |
| 9 (GND) | Ground reference | Common return path for logic and output current; must be low-impedance |
| 10 (Q1) | Output 1 | 3-state output reflecting D1 state after CLK↑; high-Z when OE = high |
| 11–18 (Q2–Q8) | Outputs 2–8 | Identical 3-state behavior to Q1; collectively form 8-bit registered bus driver |
| 19 (OE) | Output enable | Active-low control: OE = low enables outputs; OE = high places all Qx in high-impedance |
| 20 (CLK) | Clock input | Positive-edge-triggered master clock synchronizing all eight flip-flops |
| 20 (VCC) | Power supply | Primary 4.5–5.5 V supply rail; requires local 0.1-μF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Edge-triggered D flip-flops | Eight independent registers synchronized to CLK rising edge, enabling precise timing control in pipeline stages |
| 3-state outputs with high drive | ±6-mA drive capability allows direct connection to heavily loaded buses without external drivers or pull-ups |
| TTL-compatible inputs | VIH = 2 V / VIL = 0.8 V thresholds ensure interoperability with legacy 5-V TTL logic families |
| Low quiescent power | 80-μA max ICC enables use in power-constrained systems where static current impacts thermal design |
| Independent OE control | Single active-low OE pin disables all outputs simultaneously, supporting clean bus arbitration and hot-swap isolation |
Applications
| Buffer Register | I/O Port Interface |
|---|---|
Use Scenario: Holding data between asynchronous subsystems such as microcontroller peripherals and external memory or sensors. IC Role / Device Role / Timing Role: Acts as a synchronized latch stage, isolating timing domains while preserving data integrity across clock boundaries. Use Value: Eliminates metastability risk via edge-triggered capture and provides 3-state isolation during data transfer handshaking. | Use Scenario: Implementing configurable bidirectional data ports on microcontrollers with limited GPIO resources. IC Role / Device Role / Timing Role: Provides eight parallel I/O lines with direction control via OE, functioning as a programmable peripheral interface extension. Use Value: Enables single-bus communication (e.g., shared address/data bus) without external transceivers or discrete logic gates. |
| Bidirectional Bus Driver | Working Register |
Use Scenario: Driving shared system buses in industrial PLCs or test equipment where multiple masters contend for bus access. IC Role / Device Role / Timing Role: Serves as a high-drive, low-latency bus transceiver with OE-controlled direction switching and glitch-free state transitions. Use Value: Reduces board space and BOM count by replacing dual 4-bit buffers or discrete MOSFET-based direction switches. | Use Scenario: Storing intermediate computation results or status flags in real-time control firmware running on resource-limited MCUs. IC Role / Device Role / Timing Role: Functions as a fast-access scratchpad register bank, updated on each CLK edge and readable via 3-state outputs. Use Value: Offers deterministic 22-ns write-to-read latency and zero hold-time dependency, simplifying timing-critical firmware loops. |
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 |
|---|---|---|---|
| SN74HCT574DW | Same SOIC-20 package and electrical specs, but features transparent latch (not edge-triggered) behavior on G input | Suitable for level-sensitive data capture rather than clock-synchronized storage | Select SN74HCT574DW only when asynchronous gating of data flow is required instead of strict edge-triggered registration |
| 74ACT374SCX | Higher speed (tpd = 9 ns typ), 5-V-only supply (4.5–5.5 V), same pinout, but ACT family has higher ICC (40 mA max) | Better suited for high-frequency bus interfaces where propagation delay dominates timing budgets | Choose 74ACT374SCX when system clock exceeds 25 MHz and additional power budget permits higher static current |
Compared with SN74HCT574DW and 74ACT374SCX, the SN74HCT374DW delivers optimal balance of timing predictability, low power, and bus-driving strength for general-purpose 5-V register applications-making it preferred for industrial control, instrumentation, and legacy-compatible designs where edge-triggered synchronization is mandatory.
Availability
SN74HCT374DW is available at Aetrix Electronics and suitable for industrial control systems, test equipment interfaces, and embedded I/O expansion requiring stable component supply and long-term obsolescence management.
Supply support for SN74HCT374DW 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 SN74HCT374DW belongs to TI's HCT logic family, designed specifically for 5-V mixed-signal systems requiring TTL-compatible interfacing, robust noise immunity, and reliable 3-state bus control in harsh environments.
FAQ
What is the maximum clock frequency supported by the SN74HCT374DW?
The SN74HCT374DW supports a maximum clock frequency of 25 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = –40°C to +85°C). This is derived from its minimum clock pulse width (tw = 20 ns) and verified switching characteristics in the official datasheet. The SN74HCT374DW achieves this performance while maintaining full 3-state functionality and TTL-compatible input thresholds.
Does the SN74HCT374DW require external pull-up resistors on its outputs?
No, the SN74HCT374DW does not require external pull-up resistors on its outputs. Its ±6-mA output drive capability and true 3-state architecture allow direct connection to bus lines without interface components. When OE is asserted, outputs enter high-impedance mode with leakage ≤±0.5 μA, eliminating bus contention and enabling clean multi-driver arbitration-verified per Electrical Characteristics Table 5.4 in the SN74HCT374DW datasheet.
Can unused inputs on the SN74HCT374DW be left floating?
No, unused inputs on the SN74HCT374DW must not be left floating. All unused D, CLK, and OE inputs must be tied to VCC or GND per TI's SCBA004 application report to prevent undefined logic states, increased ICC, and potential device malfunction. Floating inputs induce unpredictable current draw and may cause oscillation or excessive power consumption-confirmed in Section 5.2 Recommended Operating Conditions and Layout Guidelines.
What is the thermal resistance (RθJA) of the SN74HCT374DW package?
The SN74HCT374DW in SOIC-20 (DW) package has a junction-to-ambient thermal resistance (RθJA) of 58°C/W, as specified in Section 5.3 Thermal Information of the datasheet. This value assumes standard JEDEC High-K board conditions and informs thermal design for continuous operation at maximum ambient temperature (85°C) and worst-case power dissipation (ICC × VCC).
Is the SN74HCT374DW pin-compatible with other members of the '374 family?
Yes, the SN74HCT374DW is pin-compatible with all 20-pin variants of the '374 family-including SN74HCT374DB (SSOP), SN74HCT374N (PDIP), and SN74HCT374PW (TSSOP)-as confirmed in the Pin Configuration and Functions section (Section 4) and Mechanical, Packaging, and Orderable Information (Section 11). Identical pin numbering, signal mapping, and function table apply across all packages.
SN74HCT374DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- 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:
- 40 MHz
- Max Propagation Delay @ V, Max CL:
- 25ns @ 5.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- 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
SN74HCT374DW FAQ
1.How can I place an order for SN74HCT374DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT374DW 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 SN74HCT374DW reliable?
The price and inventory of SN74HCT374DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT374DW is usually 5 days.
3.What payment methods are accepted for SN74HCT374DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HCT374DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HCT374DW?
SN74HCT374DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT374DW 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 SN74HCT374DW?
For technical support, including SN74HCT374DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT374DW requirements.
6.How does Aetrix verify that SN74HCT374DW is sourced from the original manufacturer or authorized distributors?
All SN74HCT374DW 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 SN74HCT374DW meets industry standards.
7.What is the process for return or replacement of SN74HCT374DW?
All SN74HCT374DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT374DW, 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 SN74HCT374DW part is unused and in its original packaging.
Return procedure for SN74HCT374DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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