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Texas Instruments SN74ACT374DWE4
- Part No.:
- SN74ACT374DWE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ACT374DWE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,591
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Product details
Overview
SN74ACT374DWE4 from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, operating at 4.5 V to 5.5 V supply voltage, featuring 10 ns maximum propagation delay at 5 V, TTL-compatible inputs, and ±24 mA output drive capability. It serves as a bidirectional bus driver or I/O port register in digital systems requiring high-speed data latching and bus isolation.
For engineers reviewing the SN74ACT374DWE4 datasheet, SN74ACT374DWE4 pinout, SN74ACT374DWE4 application, or SN74ACT374DWE4 equivalent, this page delivers verified functional modes, timing constraints, thermal metrics, and real-world implementation guidance for industrial control interfaces, memory address latching, and buffered data path design.
Technical Context
The SN74ACT374DWE4 implements eight independent D-type flip-flops triggered on the rising edge of CLK, with synchronous data capture and asynchronous 3-state control via OE. Its output-enable logic operates independently of clocking, allowing retention of stored data while outputs float.
Designed for bus-oriented systems, it supports high-capacitive load driving (up to 50 pF) and exhibits rail-to-rail output swing (VOH ≥ 3.7 V, VOL ≤ 0.44 V at 5 V/24 mA), with input thresholds compatible with TTL logic levels (VIH = 2 V, VIL = 0.8 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL/CMOS systems and tolerates supply ripple without functional degradation. |
| tpd (Max) | 10 ns at 5 V - Enables reliable operation up to 90 MHz clock frequency in synchronous data paths. |
| IOH/IOL | ±24 mA - Provides sufficient drive strength to directly interface with multiple CMOS/TTL loads or moderate PCB trace capacitance. |
| tsu/th | 5.5 ns setup / 1.5 ns hold - Defines minimum data stability window before and after CLK rising edge for robust metastability-free sampling. |
| IOZ (High-Z leakage) | ±2.5 μA at 5.5 V - Guarantees minimal bus loading when outputs are disabled, critical for multi-driver shared-bus integrity. |
| Ci (Input capacitance) | 4.5 pF - Limits capacitive loading on upstream drivers, supporting fan-out to ≥10 similar ACT devices without signal integrity loss. |
| Operating temperature | −40 °C to +85 °C - Qualified for commercial and industrial ambient environments without derating. |
Pinout & Package
SN74ACT374DWE4 is packaged in a 20-pin SOIC (DW) with body size 12.80 mm × 7.50 mm and nominal package size 12.80 mm × 10.3 mm. Pin 1 is located at the top-left corner adjacent to the index notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output enable input | Active-low control: drives all Q outputs to high-impedance when low; no effect on internal flip-flop state. |
| 2–9, 12, 15–19 (Q1–Q8) | Tri-state output terminals | Reflect stored D-input values when OE is high; present <1 μA leakage when OE is low, isolating bus lines. |
| 3–4, 7–8, 13–14, 17–18 (D1–D8) | Data inputs | Synchronously sampled on CLK rising edge; TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V). |
| 11 (CLK) | Clock input | Rising-edge sensitive; requires minimum pulse width of 5 ns high/low for reliable triggering. |
| 10 (GND) | Ground reference | Primary return path for all input/output currents; must be low-impedance to minimize ground bounce. |
| 20 (VCC) | Power supply | Supplies core logic and output drivers; decoupling capacitor (0.1 μF ceramic) required within 10 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State outputs with independent OE | Enables time-multiplexed bus sharing without external transceivers or pull-up resistors. |
| TTL-compatible input thresholds | Accepts standard 5 V TTL logic levels (VIH ≥ 2 V, VIL ≤ 0.8 V), eliminating level-shifting in mixed-logic systems. |
| 10 ns max tpd at 5 V | Supports >90 MHz system clock rates in latch-based pipelines with deterministic timing margins. |
| ±24 mA output drive | Drives 50 pF loads with <10% overshoot, enabling direct connection to microcontroller data buses or FPGA I/O banks. |
| Wide VCC range (4.5–5.5 V) | Accommodates aging power supplies or noisy rails without functional interruption or increased jitter. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Address Latching |
|---|---|
|
Use Scenario: Expanding GPIO count on a programmable logic controller by interfacing parallel sensors/actuators to a limited MCU bus. IC Role / Device Role / Timing Role: Acts as an 8-bit transparent latch and bus isolator, capturing sensor status on CLK edge and presenting stable data during MCU read cycles. Use Value: Eliminates need for discrete buffers or level shifters; 24 mA drive ensures reliable signaling across 15 cm ribbon cables with 30 pF/m capacitance. |
Use Scenario: Latching lower address bits (A0–A7) during multiplexed AD0–AD7 bus cycles in 8051 or Z80-based embedded systems. IC Role / Device Role / Timing Role: Serves as address latch, freezing address lines while data transfers occur on same bus lines. Use Value: 10 ns tpd guarantees setup/hold compliance with 12 MHz CPU timing; 3-state outputs prevent bus contention during data phase. |
| Legacy Bus Interface Bridge | Digital Test Equipment Data Capture |
|
Use Scenario: Bridging ISA or PC/104 bus signals to modern FPGA-based controllers where legacy peripherals require synchronous sampling. IC Role / Device Role / Timing Role: Functions as edge-triggered input register, capturing parallel status flags or command words on bus strobe edges. Use Value: OE pin allows dynamic bus release between transfers; TTL compatibility ensures direct connection to ISA bus voltage levels without translation. |
Use Scenario: Capturing parallel test vectors from automated test equipment (ATE) into high-speed acquisition logic. IC Role / Device Role / Timing Role: Provides synchronized 8-bit data capture stage, aligning asynchronous stimulus signals to system clock domain. Use Value: 1.5 ns hold time enables clean sampling of 100 MHz test clocks; low input capacitance (4.5 pF) minimizes skew across all 8 channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT574DWR | Identical AC/DC specs but includes separate output-enable polarity (active-high OE); same pinout and timing. | Better suited for systems where active-high enable logic simplifies control sequencing or reduces inverter usage. | Select SN74ACT574DWR only if OE signal originates from active-high logic; otherwise SN74ACT374DWE4 remains optimal for active-low control architectures. |
| 74LVC374APW | Lower VCC range (1.65–3.6 V), 3.3 V native operation; 6.7 ns tpd at 3.3 V; 24 mA drive; different pinout (TSSOP-20). | Targeted at mixed-voltage 3.3 V systems; not drop-in replaceable due to voltage incompatibility and package mismatch. | Choose 74LVC374APW only for new 3.3 V designs; SN74ACT374DWE4 remains mandatory for 5 V legacy or industrial bus interfaces. |
Compared with SN74ACT574DWR and 74LVC374APW, SN74ACT374DWE4 uniquely balances 5 V robustness, active-low OE simplicity, and SOIC-20 manufacturability-making it the preferred choice for industrial bus latching where voltage margin and control logic alignment are critical.
Availability
SN74ACT374DWE4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller address latching, and legacy bus interface bridge applications requiring stable component supply and long-term production continuity.
Supply support for SN74ACT374DWE4 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 and embedded processing solutions, with over 90 years of innovation in logic, power management, and signal chain technologies.
The SN74ACT374DWE4 belongs to TI's advanced CMOS (ACT) logic family, engineered for high-speed, low-noise 5 V digital interfacing in industrial automation, test equipment, and legacy computing systems.
FAQ
What is the maximum clock frequency supported by SN74ACT374DWE4?
The SN74ACT374DWE4 supports a maximum clock frequency of 90 MHz under recommended operating conditions (VCC = 5 V, TA = −40 °C to +85 °C), derived from its 5 ns minimum clock pulse width and 10 ns maximum propagation delay. This rating is validated per TI's SCAS539H datasheet Section 4.5.
Does SN74ACT374DWE4 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 pull-up resistor. TI recommends a value determined by the current-sinking capability of the driving source; typical values range from 4.7 kΩ to 10 kΩ for standard logic drivers, as specified in Section 6.1 of the SN74ACT374DWE4 datasheet.
Can SN74ACT374DWE4 interface directly with 3.3 V logic inputs?
No - SN74ACT374DWE4 inputs are TTL-compatible (VIH = 2 V min, VIL = 0.8 V max) but designed for 5 V operation. While 3.3 V logic high may meet VIH margin in some cases, TI does not guarantee interoperability; level-shifting is recommended for robust 3.3 V → 5 V signal translation per Section 4.2 of the datasheet.
What thermal resistance (RθJA) applies to SN74ACT374DWE4 in SOIC-20 package?
The SN74ACT374DWE4 in DW (SOIC-20) package has a junction-to-ambient thermal resistance (RθJA) of 58 °C/W, measured under JEDEC JESD51-2 standard conditions. This value assumes a 1-inch² copper pad with two vias, as documented in Section 4.3 of the SCAS539H datasheet.
Is SN74ACT374DWE4 RoHS compliant and lead-free?
Yes - SN74ACT374DWE4 is RoHS compliant and features NiPdAu (NIPDAU) lead finish, with MSL Level-1 rating (260 °C peak reflow). This is confirmed in TI's PACKAGE OPTION ADDENDUM, where SN74ACT374DWR (same DW package variant) is marked "Yes" for RoHS and "NIPDAU" for lead finish.
SN74ACT374DWE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 10ns @ 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
SN74ACT374DWE4 FAQ
1.How can I place an order for SN74ACT374DWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT374DWE4 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 SN74ACT374DWE4 reliable?
The price and inventory of SN74ACT374DWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT374DWE4 is usually 5 days.
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4.How is shipping managed for SN74ACT374DWE4?
SN74ACT374DWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT374DWE4 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 SN74ACT374DWE4?
For technical support, including SN74ACT374DWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT374DWE4 requirements.
6.How does Aetrix verify that SN74ACT374DWE4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT374DWE4 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 SN74ACT374DWE4 meets industry standards.
7.What is the process for return or replacement of SN74ACT374DWE4?
All SN74ACT374DWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT374DWE4, 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 SN74ACT374DWE4 part is unused and in its original packaging.
Return procedure for SN74ACT374DWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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