My Inquiry
My Account
Texas Instruments SN74ACT574NSRE4
- Part No.:
- SN74ACT574NSRE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ACT574NSRE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,851
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74ACT574NSRE4 from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for bus interface and data latching in 5-V digital systems. It operates from 4.5 V to 5.5 V, features 9 ns max propagation delay at 5 V, TTL-compatible inputs, and supports bidirectional bus driving via active-low output enable (OE).
For engineers reviewing the SN74ACT574NSRE4 datasheet, SN74ACT574NSRE4 pinout, SN74ACT574NSRE4 application, or SN74ACT574NSRE4 equivalent, key selection criteria include its 20-pin SOP (NS) package, rising-edge clock triggering, high-impedance output control, and compatibility with legacy TTL logic levels in industrial I/O and memory buffer designs.
Technical Context
The SN74ACT574NSRE4 implements eight independent D-type flip-flops synchronized to the rising edge of CLK, capturing input data (D1–D8) and presenting it at Q1–Q8 outputs. Its 3-state outputs are controlled by a shared active-low OE signal, enabling bus contention avoidance without affecting internal state retention.
This device uses ACT (Advanced CMOS TTL-compatible) logic technology, delivering rail-to-rail output swing, ±24 mA drive capability, and ESD robustness (±2000 V HBM). It is specified for –40°C to +85°C operation and supports fast timing with 2.5 ns min / 12 ns max tpd and 1 ns min hold time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5-V supply tolerances and brown-out resilience. |
| Max tpd | 9 ns at 5 V - Enables reliable operation in high-speed digital interfaces up to 85 MHz clock frequency. |
| Output Drive | ±24 mA - Sufficient to drive 50-pF loads or multiple TTL inputs without external buffers. |
| Input Compatibility | TTL-voltage compatible - Accepts 0.8 V/2.0 V logic thresholds, allowing direct interfacing with legacy 74LS and 74F families. |
| Operating Temp | –40°C to +85°C - Qualified for industrial temperature environments without derating. |
| ESD Rating | ±2000 V HBM - Meets JEDEC JS-001 for robust handling in manufacturing and field deployment. |
| Power Dissipation | 40 pF typical Cpd - Predictable dynamic power consumption under 1 MHz switching at 5 V. |
Pinout & Package
The SN74ACT574NSRE4 is packaged in a 20-pin SOP (Small Outline Package), designated NS, with body dimensions of 12.6 mm × 5.3 mm and overall package size 12.6 mm × 7.8 mm. This surface-mount package supports automated assembly and offers thermal resistance RθJA = 106.2°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE (Pin 1) | Active-low output enable | Controls all eight outputs simultaneously; when high, forces Q1–Q8 into high-impedance state for bus isolation. |
| D1–D8 (Pins 2–9) | Data inputs | Asynchronous parallel inputs latched on rising CLK edge; TTL-compatible voltage thresholds ensure interoperability. |
| GND (Pin 10) | Ground reference | Primary return path for logic and output current; must be low-impedance to minimize ground bounce. |
| CLK (Pin 11) | Clock input | Rising-edge sensitive; minimum pulse width 3 ns ensures reliable capture in high-speed synchronous systems. |
| Q8–Q1 (Pins 12–19) | Tri-state outputs | Drive bus lines directly; high-impedance mode eliminates loading when OE is asserted. |
| VCC (Pin 20) | Positive supply | 5-V nominal supply; requires local 0.1-μF bypass capacitor per TI layout guidelines to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-triggered latching | Rising-edge CLK synchronizes all eight D inputs to outputs with 1 ns min hold time, ensuring deterministic timing in pipeline stages. |
| 3-state bus interface | Shared OE pin enables simultaneous high-impedance control of all outputs, eliminating need for discrete bus transceivers in shared-data-path systems. |
| TTL-compatible inputs | Accepts 0.8 V/2.0 V thresholds - allows direct connection to 74LS, 74F, and other bipolar logic without level-shifting circuitry. |
| High-output drive | ±24 mA per output - drives 50-pF capacitive loads or up to 10 standard TTL inputs, reducing fanout constraints in dense PCB layouts. |
| Industrial temperature range | –40°C to +85°C operation - supports deployment in programmable logic controllers, motor drives, and factory automation equipment. |
Applications
| Industrial I/O Expansion | Memory Address Latching |
|---|---|
Use Scenario: Expanding GPIO count in PLC backplanes using multiplexed address/data buses. IC Role / Device Role / Timing Role: Acts as an output latch and bus driver, holding I/O states during bus arbitration cycles while isolating downstream peripherals. Use Value: Eliminates need for discrete pull-up resistors or additional bus buffers due to integrated 3-state control and ±24 mA drive strength. | Use Scenario: Capturing and holding microprocessor address bus signals for static RAM or EPROM access. IC Role / Device Role / Timing Role: Functions as an address register, latching upper address bits on rising CLK to stabilize memory decode logic during read/write cycles. Use Value: 9 ns max tpd ensures setup/hold timing margins are maintained even at 85 MHz system clocks, preventing address glitches. |
| Legacy System Interface | Test Equipment Data Capture |
Use Scenario: Bridging modern microcontrollers to legacy TTL-based instrumentation subsystems. IC Role / Device Role / Timing Role: Serves as a level-translating latch and bus isolator, accepting MCU GPIO outputs and presenting TTL-compatible signals to older test gear. Use Value: TTL-voltage compatibility and 4.5–5.5 V VCC range allow seamless integration without external level shifters or regulator changes. | Use Scenario: Capturing parallel sensor or ADC output data streams in automated test fixtures. IC Role / Device Role / Timing Role: Operates as a synchronous data sampler, freezing parallel 8-bit readings on each CLK edge for subsequent serial upload or analysis. Use Value: 1 ns min hold time and 2.5 ns min setup time support precise sampling of fast transient signals without metastability risk. |
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 | SOIC-20 package (12.8 mm × 10.3 mm); higher RθJA (101.2°C/W); same electrical specs. | Better suited for through-hole prototyping or legacy board rework where SOP footprint is unavailable. | Select when mechanical compatibility with existing SOIC footprints is required; identical logic behavior and timing. |
| SN74ACT574PWR | TSSOP-20 package (6.5 mm × 6.4 mm); smaller footprint; RθJA = 126.2°C/W; same AC/DC specs. | Ideal for space-constrained portable or high-density industrial modules requiring minimal PCB area. | Choose for miniaturized designs where 30% smaller footprint outweighs slightly reduced thermal performance. |
Compared with SN74ACT574DWR and SN74ACT574PWR, the SN74ACT574NSRE4 offers a balanced trade-off: moderate PCB area (SOP), proven thermal performance (106.2°C/W), and compatibility with standard pick-and-place workflows-making it optimal for mid-volume industrial control boards.
Availability
SN74ACT574NSRE4 is available at Aetrix Electronics and suitable for industrial I/O expansion, memory address latching, legacy system interface, and test equipment data capture requiring stable component supply and long-term manufacturability.
Supply support for SN74ACT574NSRE4 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74ACT574NSRE4 belongs to TI's 74ACT logic family, engineered for high-speed, TTL-compatible digital interfacing in industrial control, instrumentation, and legacy system upgrades where reliability and pin-level consistency are critical.
FAQ
What is the maximum clock frequency supported by the SN74ACT574NSRE4?
The SN74ACT574NSRE4 supports a maximum clock frequency of 85 MHz under recommended operating conditions (VCC = 5 V ± 0.5 V, TA = –40°C to +85°C). This is derived from its 3 ns minimum clock pulse width and 12 ns maximum propagation delay, ensuring reliable edge-triggered capture across the full industrial temperature range. The SN74ACT574NSRE4 datasheet specifies fmax = 85 MHz in Section 4.6.
Does the SN74ACT574NSRE4 require external pull-up resistors on the OE pin?
Yes - to ensure the outputs remain in high-impedance state during power-up or power-down, TI recommends tying OE to VCC via a pull-up resistor. The minimum value depends on the current-sinking capability of the driving source; typical values range from 4.7 kΩ to 10 kΩ. This prevents bus contention before system initialization completes, a requirement explicitly stated in Section 6.1 of the SN74ACT574NSRE4 datasheet.
Can the SN74ACT574NSRE4 drive standard TTL loads directly?
Yes - the SN74ACT574NSRE4 can drive standard TTL loads directly. Its outputs deliver ±24 mA at VOH/VOL specifications, exceeding the ±1.6 mA required by standard TTL inputs. Combined with TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V), this enables seamless interconnection with 74LS, 74F, and other bipolar logic families without level-shifting components, as confirmed in Sections 1 and 4.5 of the SN74ACT574NSRE4 datasheet.
What is the thermal resistance (RθJA) of the SN74ACT574NSRE4 in its SOP package?
The SN74ACT574NSRE4 in the SOP (NS) package has a junction-to-ambient thermal resistance (RθJA) of 106.2°C/W, as specified in Table 4-4 of the official datasheet. This value assumes standard JEDEC 2-layer board conditions and is critical for calculating maximum allowable power dissipation in thermally constrained industrial enclosures where ambient temperatures reach +85°C.
Is the SN74ACT574NSRE4 RoHS compliant and lead-free?
Yes - the SN74ACT574NSRE4 is RoHS compliant and features a lead-free NIPDAU (nickel/palladium/gold) lead finish, as documented in the Package Option Addendum. It carries a Level-1 moisture sensitivity rating (MSL-1) with unlimited floor life at ≤30°C/60% RH, and meets JEDEC J-STD-020 reflow profile requirements up to 260°C peak, confirming full compliance with EU RoHS Directive 2011/65/EU and related environmental standards.
SN74ACT574NSRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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:
- 110 MHz
- Max Propagation Delay @ V, Max CL:
- 11ns @ 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-SO
SN74ACT574NSRE4 FAQ
1.How can I place an order for SN74ACT574NSRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT574NSRE4 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 SN74ACT574NSRE4 reliable?
The price and inventory of SN74ACT574NSRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT574NSRE4 is usually 5 days.
3.What payment methods are accepted for SN74ACT574NSRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT574NSRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT574NSRE4?
SN74ACT574NSRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT574NSRE4 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 SN74ACT574NSRE4?
For technical support, including SN74ACT574NSRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT574NSRE4 requirements.
6.How does Aetrix verify that SN74ACT574NSRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT574NSRE4 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 SN74ACT574NSRE4 meets industry standards.
7.What is the process for return or replacement of SN74ACT574NSRE4?
All SN74ACT574NSRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT574NSRE4, 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 SN74ACT574NSRE4 part is unused and in its original packaging.
Return procedure for SN74ACT574NSRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ACT574NSRE4 Tags
-
SN74HC74DR
Texas Instruments
-
SN74HC74PWR
Texas Instruments
-
74LVC1G74GT,115
Nexperia USA Inc.
-
SN74LVC2G74DCUR
Texas Instruments
-
CD4013BM96
Texas Instruments
-
SN74HCT273PWR
Texas Instruments
-
SN74LVC1G74DCUR
Texas Instruments
-
SN74HC574DWR
Texas Instruments
-
74LVC1G74DC,125
Nexperia USA Inc.
-
SN74HC273DWR
Texas Instruments
-
SN74HCT574DWR
Texas Instruments
-
SN74LVC1G74DCTR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
