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Texas Instruments SN74HCT374DWR
- Part No.:
- SN74HCT374DWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HCT374DWR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,525
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Product details
Overview
SN74HCT374DWR from Texas Instruments is an octal edge-triggered D-type flip-flop IC with 3-state outputs, operating at 4.5 V–5.5 V supply voltage, delivering ±6 mA output drive at 5 V, featuring 22 ns typical propagation delay (tpd), and supporting bus-hold-free I/O port buffering in industrial control systems.
For engineers reviewing the SN74HCT374DWR datasheet, SN74HCT374DWR pinout, SN74HCT374DWR application, or SN74HCT374DWR equivalent, this page delivers verified functional modes, SOIC-20 package dimensions, timing constraints for synchronous data latching, and validated alternatives for bus interface register replacement.
Technical Context
The SN74HCT374DWR implements eight independent D-type flip-flops triggered on the rising edge of CLK, with asynchronous output-enable (OE) control enabling high-impedance state without affecting internal latch states. Each flip-flop samples D inputs at CLK↑ and holds Q outputs until next clock edge.
Its TTL-compatible inputs accept 0.8 V/2.0 V thresholds across 4.5–5.5 V VCC, while 3-state outputs support bidirectional bus driving with 15 LSTTL load capability and ≤0.33 V VOL at 6 mA sink current - enabling direct connection to legacy TTL buses without pull-ups or level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V logic rails and tolerance against supply ripple. |
| tpd (CLK→Q) | 22 ns typical at 5 V, CL = 50 pF - enables reliable operation up to 25 MHz clock frequency in synchronous register applications. |
| Output Drive | ±6 mA at 5 V - sufficient to directly drive 15 LSTTL loads without external buffers or fanout logic. |
| Input Compatibility | TTL-voltage compatible (VIH = 2.0 V, VIL = 0.8 V) - allows seamless interfacing with legacy 74LS and 74ALS families. |
| ICC (max) | 80 μA - ultra-low quiescent current supports power-sensitive industrial embedded designs. |
| tsu / th | 25 ns setup / 10 ns hold time at 5 V - defines minimum data stability window before and after CLK↑ for deterministic capture. |
| OE Propagation | 34 ns enable/disable delay (ten/tdis) at CL = 150 pF - ensures clean bus release during hot-swap or multi-master arbitration. |
Pinout & Package
SN74HCT374DWR uses a 20-pin SOIC (DW) package with 12.80 mm × 7.50 mm body size, 1.27 mm lead pitch, and 2.65 mm max height per JEDEC MS-013. Pin 1 is located at the top-left corner with index marking.
| 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 sampled at CLK↑; TTL-compatible voltage thresholds. |
| 10 (GND) | Ground reference | Common return path for all logic and output currents; requires low-impedance PCB plane. |
| 11–18 (Q1–Q8) | 3-state outputs | True-level outputs placed in high-Z when OE is high; drive bus lines directly at ±6 mA. |
| 19 (OE) | Output enable | Active-low control: OE = low enables outputs; OE = high forces all Q pins to high-impedance. |
| 20 (VCC) | Power supply | 5 V nominal supply; bypass capacitor (0.1 μF) required adjacent to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type latches | Eight independent flip-flops in one SOIC-20 package reduce board space vs. discrete 74-series solutions. |
| 3-state bus interface | OE-controlled high-impedance outputs eliminate need for external bus transceivers or pull-up resistors. |
| TTL-compatible inputs | VIH/VIL thresholds match 74LS family, enabling drop-in replacement without redesigning upstream drivers. |
| Low ICC quiescent current | 80 μA max ICC allows use in always-on industrial controllers without thermal derating concerns. |
| Robust timing margins | 25 ns setup + 10 ns hold time at 5 V provides margin for PCB trace skew and signal integrity degradation. |
Applications
| Industrial PLC I/O Modules | Legacy Bus Interface Adapters |
|---|---|
Use Scenario: Isolating and latching sensor/actuator signals in programmable logic controller backplanes using 5 V TTL buses. IC Role / Device Role / Timing Role: Acts as synchronized input register capturing parallel field data on rising CLK edges, with OE enabling multiplexed readout. Use Value: Eliminates need for discrete buffers and reduces component count by consolidating eight channels in one SOIC-20 footprint. |
Use Scenario: Bridging modern microcontrollers to legacy ISA or VMEbus peripherals requiring 5 V TTL-compatible latched data paths. IC Role / Device Role / Timing Role: Provides edge-triggered data capture and 3-state bus driving to share address/data lines between multiple masters. Use Value: Enables direct connection without level shifters or external pull-ups due to TTL-compatible inputs and ±6 mA drive strength. |
| Test Equipment Digital Pattern Generators | Automated Test Fixture Controllers |
Use Scenario: Generating precise, synchronized digital stimulus waveforms for semiconductor ATE systems with strict timing repeatability. IC Role / Device Role / Timing Role: Functions as a deterministic output register clocked by system timing engine; OE controls waveform output gating. Use Value: 22 ns tpd and 10 ns hold time ensure sub-50 ns timing resolution, critical for high-speed digital test vector accuracy. |
Use Scenario: Controlling solenoid valves, relays, and LED indicators in automated manufacturing test fixtures with shared 5 V backplane. IC Role / Device Role / Timing Role: Serves as output latch holding actuator states between microcontroller updates; OE enables safe hot-plug reconfiguration. Use Value: High-impedance state prevents bus contention during firmware updates or fixture reprogramming sequences. |
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 |
|---|---|---|---|
| SN74HCT574DWR | Identical pinout and electrical specs, but includes separate OE per group (two 4-bit sections); no functional difference for full-octal use. | Same bus interface role; minor layout advantage if partial-bus isolation is needed later. | Drop-in replacement with identical SOIC-20 footprint and timing; preferred if future design scalability to split-bus control is anticipated. |
| 74ACT374SCX | Higher speed (tpd = 9 ns), wider VCC range (4.5–5.5 V), but higher ICC (40 mA max) and less noise immunity (VIH = 2.2 V). | Better suited for high-frequency test equipment; not recommended for noisy industrial environments. | Select only when >30 MHz operation is required and power budget permits; verify noise margin compatibility with host system. |
Compared with SN74HCT374DWR, SN74HCT574DWR offers identical functionality in same package with added flexibility for partial-bus control, while 74ACT374SCX trades higher speed for reduced noise immunity and increased power draw - making SN74HCT374DWR optimal for robust, low-power industrial register applications.
Availability
SN74HCT374DWR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy bus interface adapters, automated test fixture controllers, and digital pattern generators requiring stable component supply over extended production lifecycles.
Supply support for SN74HCT374DWR 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 over 50 years of innovation in industrial-grade digital components.
The SN74HCT374DWR belongs to TI's 74HCT logic family, designed specifically for robust 5 V TTL-compatible interfacing in industrial automation, test equipment, and legacy system upgrades where reliability and noise immunity are critical.
FAQ
What is the maximum clock frequency supported by SN74HCT374DWR?
The SN74HCT374DWR supports a maximum clock frequency of 25 MHz under recommended operating conditions (VCC = 4.5–5.5 V, TA = –40°C to +85°C). This is derived from its 20 ns minimum pulse width requirement and 25 ns setup time, ensuring reliable edge-triggered latching without metastability in industrial control timing budgets.
Does SN74HCT374DWR require external pull-up resistors on its outputs?
No, SN74HCT374DWR does not require external pull-up resistors. Its 3-state outputs provide active drive in both high and low states (±6 mA at 5 V), and enter true high-impedance when OE is asserted - eliminating bus contention and enabling direct connection to passive or actively driven buses without external components.
Can SN74HCT374DWR operate with a 3.3 V supply?
No, SN74HCT374DWR is not rated for 3.3 V operation. Its absolute minimum VCC is 4.5 V, and input thresholds (VIH = 2.0 V, VIL = 0.8 V) are optimized for 5 V TTL compatibility. For 3.3 V systems, consider TI's SN74LVC374A or similar LVC-family devices with appropriate voltage translation.
What is the thermal resistance (RθJA) of SN74HCT374DWR in SOIC-20 package?
The junction-to-ambient thermal resistance (RθJA) of SN74HCT374DWR in SOIC-20 (DW) package is 58 °C/W under standard JEDEC test conditions. This value assumes a 1-inch² copper pad with two vias; actual board layout may alter thermal performance, especially in high-density industrial PCBs.
How does the output-enable (OE) pin affect internal flip-flop operation in SN74HCT374DWR?
The OE pin in SN74HCT374DWR has no effect on internal flip-flop operation: data continues to be latched on each CLK↑ regardless of OE state. When OE is high, outputs go high-impedance while retaining stored Q values internally - allowing new data to be loaded or old data preserved during bus arbitration without disrupting latch integrity.
SN74HCT374DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
SN74HCT374DWR FAQ
1.How can I place an order for SN74HCT374DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT374DWR 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 SN74HCT374DWR reliable?
The price and inventory of SN74HCT374DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT374DWR is usually 5 days.
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Once your SN74HCT374DWR 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 SN74HCT374DWR?
For technical support, including SN74HCT374DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT374DWR requirements.
6.How does Aetrix verify that SN74HCT374DWR is sourced from the original manufacturer or authorized distributors?
All SN74HCT374DWR 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 SN74HCT374DWR meets industry standards.
7.What is the process for return or replacement of SN74HCT374DWR?
All SN74HCT374DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT374DWR, 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 SN74HCT374DWR part is unused and in its original packaging.
Return procedure for SN74HCT374DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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