My Inquiry
My Account
Nexperia USA Inc. 74HCT574DB,112
- Part No.:
- 74HCT574DB,112
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT574DB,112.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,560
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74HCT574DB,112 from Nexperia is an 8-bit positive-edge-triggered D-type flip-flop with 3-state non-inverting outputs, TTL-compatible input levels (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), 4.5–5.5 V supply range, and -40 °C to +125 °C operation. It functions as a bus-oriented data latch in microcontroller peripheral interfaces, where CP synchronizes parallel data capture and OE enables shared-bus output control.
For engineers reviewing the 74HCT574DB,112 datasheet, 74HCT574DB,112 pinout, 74HCT574DB,112 application, or 74HCT574DB,112 equivalent, this device serves as a high-noise-immunity, low-power octal register for synchronous I/O expansion, address/data latching, and bidirectional bus isolation in industrial control and embedded systems requiring precise edge-triggered storage and 3-state bus arbitration.
Technical Context
The 74HCT574DB,112 implements eight independent D-type flip-flops sharing a common clock (CP) and active-low output enable (OE). Each flip-flop captures Dn on the LOW-to-HIGH CP transition, meeting 12 ns setup (tsu) and 0 ns hold (th) at VCC = 4.5 V, enabling reliable synchronization with 5 V TTL logic families.
Its 3-state outputs are fully decoupled from internal state: OE HIGH forces Qn into high-impedance regardless of stored data or clock activity, allowing dynamic bus contention avoidance without affecting register contents-critical for multi-master data paths and memory-mapped I/O.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HCT - TTL-compatible inputs, CMOS outputs, 4.5–5.5 V operation |
| Function | Octal D-type flip-flop with positive-edge clock and 3-state non-inverting outputs |
| Propagation Delay (tpd) | 18–33 ns (CP to Qn, VCC = 4.5 V, CL = 50 pF) - supports ≤24 MHz bus clocking |
| Enable/Disable Time | ten = 19–33 ns, tdis = 16–28 ns (OE to Qn, VCC = 4.5 V) - ensures fast bus turnaround |
| Input Voltage Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - guarantees interoperability with standard 5 V TTL drivers |
| Output Drive Strength | IOH = –6 mA, IOL = 6 mA (VOH ≥ 3.98 V, VOL ≤ 0.33 V at VCC = 4.5 V) - drives standard 50 Ω transmission lines or 10 LS-TTL loads |
| Operating Temperature | –40 °C to +125 °C - qualified for extended industrial and under-hood applications |
Pinout & Package
74HCT574DB,112 uses the SOT339-1 (SSOP20) package: 20-pin shrink small outline plastic package, 0.65 mm pitch, 7.2 mm × 5.3 mm body, 1.2 mm height. Pin 1 index located at top-left corner with beveled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low 3-state output enable | Drives all Qn outputs to high-Z when HIGH; no effect on internal flip-flop state |
| 2–9 (D0–D7) | Data inputs | Sampled on LOW-to-HIGH CP edge; meet 12 ns setup / 0 ns hold at VCC = 4.5 V |
| 10 (GND) | Ground reference | 0 V return path for all internal logic and output drivers |
| 11 (CP) | Clock input | Positive-edge-triggered; minimum pulse width 16 ns at VCC = 4.5 V |
| 12–19 (Q0–Q7) | 3-state non-inverting outputs | Reflect Dn state after CP edge; tri-state when OE = HIGH; drive capability ±6 mA |
| 20 (VCC) | Supply voltage | 4.5–5.5 V nominal; supports 160 μA max ICC at +125 °C |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible input thresholds | VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V - eliminates level-shifting for legacy 5 V systems |
| High noise immunity | Typical noise margin >1.2 V - suppresses EMI-induced glitches on shared PCB traces |
| Bus-oriented 3-state outputs | Common OE control with <33 ns enable/disable - enables deterministic multi-device bus arbitration |
| Extended temperature range | –40 °C to +125 °C operation - supports deployment in motor drives and power supplies |
| ESD robustness | HBM >2000 V, CDM >1000 V - withstands handling and board-level transient events |
Applications
| Microcontroller I/O Expansion | Address/Data Bus Latching |
|---|---|
Use Scenario: Adding parallel GPIO to an MCU with limited native I/O pins via SPI/I²C interface with local decode logic. IC Role / Device Role / Timing Role: Acts as synchronized 8-bit input latch capturing external switch/sensor states on CP edge; OE isolates bus during MCU read cycles. Use Value: Enables deterministic sampling of asynchronous inputs without software polling; 3-state outputs prevent bus contention during MCU write operations. | Use Scenario: Holding address bits stable during memory access in 8-bit microprocessor systems (e.g., Z80, 8051 derivatives). IC Role / Device Role / Timing Role: Captures address byte on rising CP edge generated by ALE signal; OE tied LOW for transparent latching during valid address window. Use Value: Eliminates address skew between high/low byte transfers; ±6 mA drive sustains signal integrity across 10 cm PCB traces at 24 MHz. |
| Industrial PLC Input Module | Digital Signal Isolation Interface |
Use Scenario: Buffering 24 V DC field sensor inputs into a 5 V logic domain using optocouplers and level translation. IC Role / Device Role / Timing Role: Stores conditioned digital inputs post-isolation; CP synchronized to system scan clock; OE controlled by watchdog timer for fail-safe bus disable. Use Value: Provides cycle-accurate input snapshotting; high-impedance outputs prevent backfeeding into isolated channels during fault conditions. | Use Scenario: Interfacing multiple FPGA I/O banks operating at different voltage levels (3.3 V, 2.5 V) to a shared 5 V backplane bus. IC Role / Device Role / Timing Role: Latches FPGA output data on CP edge; OE managed by bus arbiter to grant exclusive access per master. Use Value: Resolves voltage domain mismatch without external level shifters; 125 °C rating supports convection-cooled chassis environments. |
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 |
|---|---|---|---|
| SN74HCT574N | DIP-20 package; higher thermal resistance (RθJA = 70 °C/W vs. SSOP's 110 °C/W); same electrical specs | Suitable for prototyping and through-hole assembly; not for space-constrained PCBs | Select for breadboard evaluation or legacy DIP-based designs requiring identical logic behavior |
| 74LVC574APW | 3.3 V only (1.65–3.6 V); LVCMOS inputs; faster tpd (5.5 ns typ); lower drive (±24 mA) | Requires level shifting for 5 V buses; optimized for low-voltage portable systems | Choose when migrating to 3.3 V domains and prioritizing speed/power over 5 V compatibility |
Compared with SN74HCT574N and 74LVC574APW, the 74HCT574DB,112 uniquely balances 5 V TTL interoperability, SSOP20 space efficiency, and extended temperature resilience-making it optimal for industrial bus interfaces where voltage compatibility and thermal reliability outweigh raw speed or through-hole convenience.
Availability
74HCT574DB,112 is available at Aetrix Electronics and suitable for industrial control systems, embedded instrumentation, and programmable logic controller (PLC) modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT574DB,112 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
Nexperia is a global semiconductor expert specializing in high-performance, energy-efficient logic, analog, and discrete components for automotive, industrial, and consumer applications.
The 74HCT574 series belongs to Nexperia's industry-standard logic portfolio, designed specifically for robust, pin-compatible replacement of legacy TTL and CMOS latches in bus-oriented digital systems demanding reliability across wide temperature and voltage ranges.
FAQ
What is the maximum clock frequency supported by the 74HCT574DB,112?
The 74HCT574DB,112 supports a maximum clock frequency of 24 MHz at VCC = 4.5 V and CL = 50 pF, derived from its 33 ns maximum propagation delay (tpd) and 20 ns minimum clock pulse width (tW). At VCC = 5 V with reduced load (CL = 15 pF), fmax reaches 76 MHz-valid only under tightly controlled signal integrity conditions.
Can the 74HCT574DB,112 operate reliably at 3.3 V supply?
No-the 74HCT574DB,112 is specified exclusively for 4.5–5.5 V operation. At 3.3 V, VIH (2.0 V min) exceeds 60% of VCC, violating input threshold ratios and risking unreliable recognition of HIGH inputs; use 74LVC574APW instead for 3.3 V systems.
How does the output enable (OE) pin interact with the internal flip-flop state?
The OE pin has no effect on internal flip-flop state: when OE is HIGH, Qn outputs enter high-impedance mode while stored Dn values remain unchanged and continue to respond to subsequent CP edges. This allows safe bus sharing without disrupting ongoing register updates.
Is the 74HCT574DB,112 RoHS-compliant and halogen-free?
Yes-74HCT574DB,112 complies with EU RoHS Directive 2011/65/EU and Nexperia's Halogen-Free Standard (IEC 61249-2-21), with brominated flame retardants and chlorine content below 900 ppm each, verified per JEDEC J-STD-70B test methods.
74HCT574DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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:
- 76 MHz
- Max Propagation Delay @ V, Max CL:
- 33ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3.5 pF
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
74HCT574DB,112 FAQ
1.How can I place an order for 74HCT574DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT574DB,112 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 74HCT574DB,112 reliable?
The price and inventory of 74HCT574DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT574DB,112 is usually 5 days.
3.What payment methods are accepted for 74HCT574DB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT574DB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT574DB,112?
74HCT574DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT574DB,112 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 74HCT574DB,112?
For technical support, including 74HCT574DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT574DB,112 requirements.
6.How does Aetrix verify that 74HCT574DB,112 is sourced from the original manufacturer or authorized distributors?
All 74HCT574DB,112 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 74HCT574DB,112 meets industry standards.
7.What is the process for return or replacement of 74HCT574DB,112?
All 74HCT574DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT574DB,112, 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 74HCT574DB,112 part is unused and in its original packaging.
Return procedure for 74HCT574DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT574DB,112 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
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…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
