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Texas Instruments SN74ACT374DW
- Part No.:
- SN74ACT374DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ACT374DW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,503
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Product details
Overview
SN74ACT374DW from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for bus interface and data latching in digital systems operating at 4.5 V to 5.5 V. It features 10 ns maximum propagation delay at 5 V, TTL-compatible inputs, and ±24 mA output drive capability. It is used in I/O port expansion and bidirectional bus driving applications where high-impedance control and noise-immune timing are required.
For engineers reviewing the SN74ACT374DW datasheet, SN74ACT374DW pinout, SN74ACT374DW application, or SN74ACT374DW equivalent, key selection criteria include its 20-pin SOIC (DW) package, 5 V supply tolerance, clock-edge-triggered storage behavior, and 3-state output enable functionality for shared-bus environments.
Technical Context
The SN74ACT374DW implements eight independent D-type flip-flops, each triggered on the rising edge of the CLK signal to capture and hold input data. Its buffered OE (output enable) input controls all eight outputs simultaneously, placing them in high-impedance state without affecting internal latch operation.
It operates within −40°C to +85°C ambient temperature, supports 100 MHz maximum clock frequency at 5 V, and maintains logic-level compatibility across TTL and 5 V CMOS families due to input voltage tolerance up to 5.5 V and guaranteed VIH/VIL thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures robust operation across industrial-grade 5 V rails with ±10% tolerance. |
| tpd (Max) | 10 ns at 5 V - enables reliable timing in high-speed digital interfaces up to 100 MHz. |
| IOL / IOH | ±24 mA - provides sufficient drive strength for directly interfacing with multiple TTL loads or PCB traces. |
| Input Compatibility | TTL-voltage compatible - accepts standard TTL logic levels without level-shifting circuitry. |
| Operating Temperature | −40°C to +85°C - qualified for industrial ambient conditions without derating. |
| Output Enable | Active-low OE pin - allows synchronous bus release without disrupting internal register state. |
Pinout & Package
SN74ACT374DW is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 10.3 mm (body size 12.80 mm × 7.50 mm), with standard 1.27 mm pitch and 2.65 mm max height per JEDEC MS-013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output enable control | Active-low signal that places all Q outputs in high-impedance state; does not affect internal latch operation. |
| 2–9, 12, 15–16, 19 (Q1–Q8) | Tri-state outputs | Eight buffered, edge-triggered outputs capable of driving capacitive or low-impedance bus lines. |
| 3–4, 7–8, 13–14, 17–18 (D1–D8) | Data inputs | Eight asynchronous D inputs synchronized to CLK rising edge; accept voltages up to 5.5 V. |
| 10 (GND) | Ground reference | Primary return path for logic and output current; must be low-impedance for stable switching. |
| 11 (CLK) | Clock input | Rising-edge-triggered master clock; minimum pulse width 5 ns ensures reliable sampling. |
| 20 (VCC) | Power supply | 5 V nominal supply rail; decoupling capacitor required near pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-triggered storage | Positive-edge CLK synchronizes all eight D inputs to Q outputs, enabling deterministic pipeline staging. |
| 3-state output control | Single OE pin disables all outputs simultaneously, allowing safe bus sharing without contention. |
| TTL-compatible inputs | VIH = 2 V, VIL = 0.8 V - interoperates directly with legacy TTL logic without level translation. |
| High-output drive | ±24 mA per output - eliminates need for external buffers when driving multiple loads or long traces. |
| Wide supply range | 4.5 V to 5.5 V - accommodates aging power supplies and ripple while maintaining full AC/DC specs. |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
Use Scenario: Expanding discrete I/O points in programmable logic controllers using parallel backplane buses. IC Role / Device Role / Timing Role: Acts as an octal latch and bus driver, capturing sensor/actuator status on CLK edge and presenting it to the CPU via 3-state outputs. Use Value: Enables direct connection to 5 V TTL/CMOS backplanes with no external pull-ups or translators, reducing BOM count and layout complexity. | Use Scenario: Bridging modern microcontrollers to legacy ISA or VMEbus peripherals requiring 5 V tolerant, high-drive latching. IC Role / Device Role / Timing Role: Serves as a bidirectional data register, holding CPU writes until strobed and presenting peripheral reads with controlled bus release. Use Value: Provides precise timing alignment (10 ns tpd) and ±24 mA drive to meet legacy bus setup/hold and loading requirements. |
| Test Equipment Digital Pattern Generator | Automated Test Fixture Control |
Use Scenario: Generating synchronized multi-bit stimulus patterns for IC functional testing under automated test equipment (ATE) control. IC Role / Device Role / Timing Role: Functions as a parallel output register, storing pattern words from controller memory and releasing them on CLK edge with deterministic skew. Use Value: Delivers sub-10 ns inter-output skew and 100 MHz max clock rate, supporting high-speed digital vector generation. | Use Scenario: Controlling solenoids, relays, and LED indicators in production-line test fixtures with shared control bus architecture. IC Role / Device Role / Timing Role: Latches control commands from host MCU and drives high-current loads through external transistors, with OE enabling safe bus isolation during reconfiguration. Use Value: Allows hot-swapping of fixture modules without bus contention, thanks to fast, glitch-free 3-state transition (<12 ns tPZL/tPHZ). |
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 |
|---|---|---|---|
| SN74ACT574DW | Identical pinout and AC/DC specs, but includes separate output-enable polarity (active-high OE). | Suitable where system-level OE logic is active-high or requires inverted control signaling. | Select SN74ACT574DW only if OE polarity matching simplifies upstream logic design. |
| 74ACT374PC | Same logic function and timing, but in 20-pin PDIP (N) package with larger footprint and through-hole mounting. | Preferred for prototyping, manual assembly, or legacy board designs requiring through-hole components. | Choose 74ACT374PC when mechanical compatibility with existing DIP layouts or hand-soldering is required. |
Compared with SN74ACT574DW and 74ACT374PC, the SN74ACT374DW offers identical core functionality in a surface-mount SOIC package optimized for automated assembly and space-constrained industrial PCBs, with no compromise in speed, drive, or temperature range.
Availability
SN74ACT374DW is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, and automated test fixture control requiring stable component supply and long-term lifecycle support.
Supply support for SN74ACT374DW 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 SNx4ACT374 family was designed to deliver high-speed, 3-state-capable octal latching in 5 V systems, targeting bus-oriented applications where noise immunity, drive strength, and timing predictability are critical.
FAQ
What is the maximum clock frequency supported by the SN74ACT374DW?
The SN74ACT374DW supports a maximum clock frequency of 100 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This value is derived from the minimum clock pulse width (5 ns high/low) and verified in the switching characteristics table of the official TI datasheet SCAS539H. At higher temperatures or lower supply voltages, timing margins reduce accordingly, and designers should consult the full timing diagram for worst-case validation.
Does the SN74ACT374DW require external pull-up resistors on the OE pin?
Yes, for defined high-impedance state during power-up or power-down, the OE pin of the SN74ACT374DW must be tied to VCC through a pull-up resistor. TI recommends determining the minimum resistance based on the current-sinking capability of the driving source, as specified in Section 6.1 of the datasheet. Leaving OE floating risks undefined output states and potential bus contention.
Can the SN74ACT374DW operate reliably with a 4.75 V supply?
Yes, the SN74ACT374DW is fully specified to operate from 4.5 V to 5.5 V, so 4.75 V falls well within its recommended operating range. All AC and DC parameters-including propagation delay (10 ns max), output drive (±24 mA), and input thresholds-are guaranteed across this entire range, making it suitable for systems with marginal or aging 5 V rails.
How many data inputs and outputs does the SN74ACT374DW have?
The SN74ACT374DW contains eight independent D-type flip-flops, resulting in eight data inputs (D1–D8) and eight 3-state outputs (Q1–Q8), plus one shared clock (CLK) and one shared output-enable (OE) pin. This configuration is explicitly confirmed in the device description, pin function table, and functional block diagram of the TI SCAS539H datasheet.
Is the SN74ACT374DW pin-compatible with the SN74LS374?
No, the SN74ACT374DW is not pin-compatible with the SN74LS374. Although both are octal D-type flip-flops in 20-pin packages, the LS version uses a different pin assignment-specifically, the LS374 places GND at pin 10 and VCC at pin 20 (same as ACT374), but its OE and CLK positions differ, and its output drive and timing characteristics are incompatible. Direct substitution would require PCB redesign.
SN74ACT374DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- 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:
- 160 MHz
- Max Propagation Delay @ V, Max CL:
- 8.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- 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
SN74ACT374DW FAQ
1.How can I place an order for SN74ACT374DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT374DW 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 SN74ACT374DW reliable?
The price and inventory of SN74ACT374DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT374DW is usually 5 days.
3.What payment methods are accepted for SN74ACT374DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT374DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT374DW?
SN74ACT374DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT374DW 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 SN74ACT374DW?
For technical support, including SN74ACT374DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT374DW requirements.
6.How does Aetrix verify that SN74ACT374DW is sourced from the original manufacturer or authorized distributors?
All SN74ACT374DW 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 SN74ACT374DW meets industry standards.
7.What is the process for return or replacement of SN74ACT374DW?
All SN74ACT374DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT374DW, 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 SN74ACT374DW part is unused and in its original packaging.
Return procedure for SN74ACT374DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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