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Texas Instruments SN74AC374DWRE4
- Part No.:
- SN74AC374DWRE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AC374DWRE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:990
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Product details
Overview
SN74AC374DWRE4 from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state noninverting outputs, operating from 2V to 6V VCC, featuring 9.5ns max propagation delay at 5V and designed for bus-oriented systems including I/O ports and bidirectional data buffers.
For engineers reviewing the SN74AC374DWRE4 datasheet, SN74AC374DWRE4 pinout, SN74AC374DWRE4 application, or SN74AC374DWRE4 equivalent, this page delivers verified functional mode behavior, timing parameters across 3.3V/5V operation, 3-state output drive capability, and package-specific thermal and layout guidance for SOIC-20 implementation.
Technical Context
The SN74AC374DWRE4 implements eight independent D-type flip-flops triggered on the positive clock edge, with synchronous data capture and asynchronous 3-state control via an active-low OE input that does not affect internal register state. Its logic diagram confirms noninverting Q outputs and full parallel access for simultaneous loading of all eight bits.
It supports dual-voltage operation (2V–6V), accepts input voltages up to 6V regardless of VCC, and delivers ±24mA output drive at 5V while maintaining high-impedance isolation during OE assertion - enabling direct connection to shared bus lines without external pull-ups or interface logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports mixed-voltage system interfacing and legacy 5V or modern 3.3V logic domains |
| Max tpd | 9.5ns at 5V - enables reliable operation in high-speed digital control paths up to 100MHz clock frequency |
| Output Drive | ±24mA at 5V - sufficient to drive 50pF bus loads directly without buffer amplification |
| Input Voltage Tolerance | Up to 6V independent of VCC - allows safe interfacing with higher-voltage peripherals or level-shifted signals |
| 3-State Enable | Active-low OE pin - places outputs in high-Z mode without affecting stored register contents or clock/data sequencing |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded control and instrumentation applications |
Pinout & Package
SN74AC374DWRE4 is packaged in a 20-pin SOIC (DW) with 12.80mm × 10.3mm body size, 1.27mm lead pitch, and RoHS-compliant NiPdAu lead finish. It features standard JEDEC MS-013 outline and Level-1 moisture sensitivity rating (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output enable control | Active-low signal disabling all eight Q outputs into high-impedance state without altering internal register values |
| 2–9, 12, 15–19 (Q1–Q8) | Noninverting outputs | Eight buffered, 3-state-capable outputs directly driving bus lines or downstream logic |
| 3–4, 7–8, 13–14, 17–18 (D1–D8) | Data inputs | Eight independent D inputs synchronized to CLK↑ for parallel data latching |
| 10 (GND) | Ground reference | Primary return path for all internal logic and output current; requires local 0.1µF bypass capacitor |
| 11 (CLK) | Clock input | Positive-edge-triggered master clock controlling simultaneous capture of all eight D inputs |
| 20 (VCC) | Power supply | Single-supply rail supporting 2V–6V operation; must be decoupled near pin with 0.1µF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2V–6V) | Enables interoperability across 3.3V microcontrollers and 5V legacy peripherals without level shifters |
| 9.5ns max tpd at 5V | Supports 100MHz clocking in synchronous data acquisition and control loops |
| 3-state noninverting outputs | Allows bidirectional bus sharing among multiple devices without contention or external tri-state logic |
| Input voltage tolerance to 6V | Permits direct connection to 5V-tolerant GPIOs or open-drain interfaces without clamping diodes |
| Full parallel data access | Enables simultaneous loading of eight-bit registers for I/O port expansion or latch-based buffering |
Applications
| Industrial I/O Expansion | Microcontroller Bus Interface |
|---|---|
Use Scenario: Adding parallel digital I/O capability to PLC modules or sensor concentrators using limited MCU GPIOs. IC Role / Device Role / Timing Role: Acts as an 8-bit output latch and input buffer, synchronizing host reads/writes via shared address/data bus and OE-controlled tristate isolation. Use Value: Reduces firmware overhead by enabling atomic 8-bit transfers and eliminates need for discrete transceivers or pull-up networks. | Use Scenario: Interfacing an 8-bit microcontroller data bus to external memory-mapped peripherals or display drivers. IC Role / Device Role / Timing Role: Serves as a transparent data latch between CPU and peripheral, capturing address/data on CLK↑ and isolating bus during OE assertion. Use Value: Provides clean signal integrity on shared buses and prevents bus contention during read-modify-write cycles. |
| Digital Test Equipment | Automated Test Fixture Control |
Use Scenario: Generating precise stimulus patterns or capturing response waveforms in benchtop logic analyzers and pattern generators. IC Role / Device Role / Timing Role: Functions as a synchronized 8-bit waveform generator stage, clocked from system timing engine with OE enabling pattern update gating. Use Value: Delivers sub-10ns edge alignment across all eight outputs, critical for setup/hold compliance in high-speed digital test vectors. | Use Scenario: Controlling solenoid banks, relay matrices, or LED arrays in production-line test fixtures requiring deterministic timing and isolation. IC Role / Device Role / Timing Role: Operates as a safety-isolated output register, where OE disables all outputs during fault conditions or power sequencing. Use Value: Ensures fail-safe bus disconnection without disrupting internal state, supporting IEC 61508-compliant control architecture. |
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 |
|---|---|---|---|
| SN74LVC374APWR | Lower VCC range (1.65V–3.6V); 6.7ns tpd at 3.3V; 3.6V max input tolerance | Better suited for 3.3V-only portable or low-power systems; not compatible with 5V buses | Select when operating exclusively at 3.3V and requiring faster timing or lower static current (ICC = 10µA typical) |
| 74AC574SCX | Same AC logic family; identical 2V–6V range and 9.5ns tpd; PDIP-20 only; no SOIC option | Limited to through-hole assembly; lacks tape-and-reel packaging and RoHS-compliant finish | Choose only for legacy through-hole designs where SOIC footprint is unavailable or rework constraints prohibit surface-mount use |
Compared with SN74LVC374APWR and 74AC574SCX, SN74AC374DWRE4 uniquely balances 5V bus compatibility, SOIC-20 surface-mount readiness, and industrial temperature range - making it optimal for mixed-signal industrial controllers where voltage flexibility and layout efficiency are jointly critical.
Availability
SN74AC374DWRE4 is available at Aetrix Electronics and suitable for industrial I/O expansion, microcontroller bus interfacing, digital test equipment, and automated test fixture control requiring stable component supply and long-term manufacturing continuity.
Supply support for SN74AC374DWRE4 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 for industrial, automotive, and communications markets.
The SN74AC374DWRE4 belongs to TI's 74AC advanced CMOS logic family, engineered for high-speed, low-noise, mixed-voltage digital interfacing in industrial control and instrumentation systems.
FAQ
What is the maximum clock frequency supported by SN74AC374DWRE4?
The SN74AC374DWRE4 supports up to 100MHz clock frequency at VCC = 5V ± 0.5V and 60MHz at VCC = 3.3V ± 0.3V, as specified in Sections 4.5 and 4.6 of the TI SCAS543G datasheet. These values reflect guaranteed timing margins under recommended operating conditions and include setup/hold time allowances for robust synchronization.
Does SN74AC374DWRE4 require external pull-up resistors on the OE pin?
Yes - for defined high-impedance state during power-up or power-down, OE must be tied to VCC through a pullup resistor. TI recommends minimum resistance based on driver sink capability; typical values range from 4.7kΩ to 10kΩ. Leaving OE floating risks undefined output states and potential bus contention.
Can SN74AC374DWRE4 safely interface with 5V logic while powered at 3.3V?
Yes - SN74AC374DWRE4 inputs accept voltages up to 6V regardless of VCC, so 5V-tolerant signals may be applied directly to D and CLK pins when VCC = 3.3V. However, outputs swing only to 3.3V levels and must not drive 5V-input-only receivers without level translation.
What is the thermal resistance (RθJA) of SN74AC374DWRE4 in its SOIC-20 package?
The junction-to-ambient thermal resistance RθJA for SN74AC374DWRE4 in the DW (SOIC-20) package is 101.2°C/W, per Section 4.3 of the SCAS543G datasheet. This value assumes standard JEDEC high-K board conditions; actual performance improves with PCB copper area and airflow.
How does the 3-state output behavior of SN74AC374DWRE4 differ from standard push-pull outputs?
When OE is asserted (low), SN74AC374DWRE4 outputs enter high-impedance mode - neither sourcing nor sinking significant current - allowing multiple devices to share a common bus without contention. Unlike push-pull outputs, this state eliminates DC loading and enables true bidirectional bus arbitration under software or hardware control.
SN74AC374DWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 155 MHz
- Max Propagation Delay @ V, Max CL:
- 9.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 4.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AC374DWRE4 FAQ
1.How can I place an order for SN74AC374DWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC374DWRE4 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 SN74AC374DWRE4 reliable?
The price and inventory of SN74AC374DWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC374DWRE4 is usually 5 days.
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SN74AC374DWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC374DWRE4 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 SN74AC374DWRE4?
For technical support, including SN74AC374DWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC374DWRE4 requirements.
6.How does Aetrix verify that SN74AC374DWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74AC374DWRE4 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 SN74AC374DWRE4 meets industry standards.
7.What is the process for return or replacement of SN74AC374DWRE4?
All SN74AC374DWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC374DWRE4, 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 SN74AC374DWRE4 part is unused and in its original packaging.
Return procedure for SN74AC374DWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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