My Inquiry
My Account
Nexperia USA Inc. 74AHCT574BQ,115
- Part No.:
- 74AHCT574BQ,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Flip Flops
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
74AHCT574BQ,115.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,745
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74AHCT574BQ,115 from Nexperia is an octal positive-edge-triggered D-type flip-flop with 3-state non-inverting outputs, designed for bus-oriented digital systems requiring synchronized data latching and output isolation. It operates at 4.5 V to 5.5 V supply, features TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V), supports −40 °C to +125 °C ambient range, and delivers 4.4 ns typical propagation delay (VCC = 5 V, CL = 15 pF) in DHVQFN20 package.
For engineers reviewing the 74AHCT574BQ,115 datasheet, 74AHCT574BQ,115 pinout, 74AHCT574BQ,115 application, or 74AHCT574BQ,115 equivalent, this device is selected for high-speed parallel data capture, address/data bus buffering, and level-translating register interfaces where precise edge-triggered storage and low-impedance/high-Z output control are required.
Technical Context
The 74AHCT574BQ,115 implements eight independent D-type flip-flops sharing a common clock (CP) and active-low output enable (OE). Each flip-flop captures the logic state of its D-input on the LOW-to-HIGH CP transition, meeting 3.0 ns set-up and 1.5 ns hold time requirements at 5 V. OE controls all eight outputs simultaneously without affecting internal latch states.
Its TTL-level inputs allow direct interfacing with legacy 5 V logic families, while overvoltage-tolerant inputs (up to 5.5 V) support mixed-voltage domain operation. The device uses CMOS circuitry for low static power (ICC ≤ 80 μA at VCC = 5.5 V) and exhibits balanced tPLH/tPHL propagation delays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Type | Octal D-type flip-flop with 3-state non-inverting outputs |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL systems |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - meets TTL voltage level definitions for reliable interfacing |
| Propagation Delay | 4.4 ns (typ.) at VCC = 5 V, CL = 15 pF - enables ≥110 MHz maximum clock frequency in bus applications |
| Operating Temperature | −40 °C to +125 °C - qualified for industrial and extended-temperature embedded control |
| Output Drive | ±8 mA at VCC = 4.5 V - sufficient for driving 50 pF loads with defined VOH/VOL margins |
| Package | DHVQFN20 (SOT764-1), 2.5 × 4.5 × 0.85 mm - thermal-enhanced, leadless, space-efficient for high-density PCBs |
Pinout & Package
DHVQFN20 (SOT764-1) package: 20-terminal, no-lead, thermally enhanced quad flat package with exposed die pad (non-soldered by default); body dimensions 2.5 mm × 4.5 mm × 0.85 mm; pin 1 index marked on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference (0 V); thermal pad underneath is electrically isolated unless explicitly connected to GND |
| 2–9 | D0–D7 | Asynchronous data inputs; accept TTL-level signals; overvoltage tolerant to 5.5 V |
| 10 | CP | Clock input; positive-edge triggered; LOW-to-HIGH transition latches Dn inputs |
| 11 | OE | Active-low 3-state output enable; HIGH forces Q0–Q7 into high-impedance mode |
| 12–19 | Q0–Q7 | Non-inverting registered outputs; driven only when OE = LOW; otherwise high-Z |
| 20 | VCC | Positive supply rail; must be decoupled locally due to fast switching transients |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH = 2.0 V, VIL = 0.8 V - eliminates need for external level shifters when interfacing with 74LS/74F logic |
| Overvoltage-tolerant inputs | Rated to 5.5 V regardless of VCC - enables safe use in mixed-supply systems with 3.3 V control and 5 V data buses |
| Low propagation skew | tPLH/tPHL matching ≤ 0.5 ns - ensures deterministic timing across all eight outputs in synchronous bus designs |
| High noise immunity | Input hysteresis via Schmitt-trigger action - suppresses false triggering from slow-rising or noisy clock/data lines |
| Industrial temperature grade | Specified from −40 °C to +125 °C - supports operation in motor drives, PLC I/O modules, and outdoor telecom equipment |
Applications
| Industrial Bus Interface | Microcontroller Peripheral Latch |
|---|---|
|
Use Scenario: Isolating and latching parallel address/data bus signals between a microcontroller and external memory or peripheral ICs. IC Role / Device Role / Timing Role: Acts as a synchronizing register that captures bus data on CPU write strobe edges and presents stable outputs during memory access cycles. Use Value: Prevents bus contention and metastability by decoupling asynchronous peripheral timing from core CPU clock domain using edge-triggered storage. |
Use Scenario: Capturing GPIO port states or sensor readings before CPU read access in real-time control firmware. IC Role / Device Role / Timing Role: Provides hardware-based snapshot capture of parallel input data on rising clock edge, enabling deterministic sampling independent of software latency. Use Value: Guarantees atomic read of multi-bit status registers (e.g., encoder position, fault flags) without bit skew or partial updates. |
| Legacy System Upgrade Interface | Test Equipment Signal Conditioning |
|
Use Scenario: Bridging modern FPGA I/O banks (3.3 V) to legacy 5 V TTL backplanes or instrumentation interfaces. IC Role / Device Role / Timing Role: Functions as a level-translating, edge-synchronized buffer with 3-state control for bidirectional bus arbitration. Use Value: Enables drop-in replacement of obsolete 74LS574 while maintaining timing integrity and eliminating external voltage translators. |
Use Scenario: Capturing and holding parallel test vectors or calibration data in automated test equipment (ATE) signal path stages. IC Role / Device Role / Timing Role: Serves as a precision timing-controlled latch to freeze analog-to-digital converter outputs or pattern generator states for measurement analysis. Use Value: Reduces jitter-induced sampling uncertainty by providing sub-5 ns propagation delay and tight output skew across all 8 bits. |
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 |
|---|---|---|---|
| SN74AHCT574PWR | TSSOP20 package (SOT360-1); identical electrical specs; 4.4 mm body width vs. 4.5 mm | Better suited for manual rework or lower-volume prototyping due to gull-wing leads | Select when board assembly process favors鸥翼引线而非无引脚封装,或需更宽松的焊盘公差 |
| 74LVCH16374ADGG | 16-bit dual-rank version; 3.3 V only (1.65–3.6 V); LVCMOS inputs; different pinout | Targets higher-density 3.3 V systems; not pin-compatible or voltage-compatible | Choose only when migrating to 3.3 V architecture and requiring double the register width |
Compared with SN74AHCT574PWR, the 74AHCT574BQ,115 offers superior thermal performance and smaller footprint for high-density industrial PCBs; compared with 74LVCH16374ADGG, it maintains full 5 V TTL interoperability but provides half the channel count in a more compact package.
Availability
74AHCT574BQ,115 is available at Aetrix Electronics and suitable for industrial bus interface, microcontroller peripheral latch, legacy system upgrade interface, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for 74AHCT574BQ,115 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 delivering high-performance logic, discrete, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in industrial, automotive, and consumer applications.
The 74AHCT574BQ,115 belongs to Nexperia's advanced logic family targeting robust, high-speed digital interfacing in harsh environments - engineered specifically for bus buffering, data capture, and level translation in mission-critical embedded systems.
FAQ
What is the minimum pulse width required on the CP input?
The minimum clock pulse width (tW) for 74AHCT574BQ,115 is 5.0 ns at VCC = 4.5 V to 5.5 V with CL = 50 pF load. This ensures reliable edge detection and avoids metastability during setup/hold window violations. Pulse widths below this value may cause inconsistent latching behavior or failure to register input data.
Can OE be toggled while CP is active without affecting stored data?
Yes - the OE input is asynchronous and does not affect internal flip-flop states. When OE transitions HIGH, outputs enter high-impedance mode immediately (tdis ≤ 13.0 ns), but the latched D-input values remain preserved until the next CP edge. This allows dynamic bus release without data corruption.
Is the exposed thermal pad on the DHVQFN20 package required to be soldered?
No - the exposed pad (terminal 1) has no electrical function and requires no solder connection. If soldered, it must remain electrically floating or be connected to GND; intentional grounding improves thermal dissipation but is optional per datasheet guidance (SOT764-1 note).
How does the 74AHCT574BQ,115 differ from the 74AHC574BQ variant?
The 74AHCT574BQ,115 uses TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V), whereas 74AHC574BQ uses CMOS thresholds (VIH ≈ 3.85 V at VCC = 5.5 V). This makes the AHCT version directly compatible with legacy 5 V TTL logic families without level-shifting, unlike the AHC variant which requires clean 5 V signaling.
74AHCT574BQ,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74AHCT
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 115 MHz
- Max Propagation Delay @ V, Max CL:
- 10.6ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-DHVQFN (4.5x2.5)
74AHCT574BQ,115 FAQ
1.How can I place an order for 74AHCT574BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT574BQ,115 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 74AHCT574BQ,115 reliable?
The price and inventory of 74AHCT574BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT574BQ,115 is usually 5 days.
3.What payment methods are accepted for 74AHCT574BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT574BQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT574BQ,115?
74AHCT574BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT574BQ,115 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 74AHCT574BQ,115?
For technical support, including 74AHCT574BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT574BQ,115 requirements.
6.How does Aetrix verify that 74AHCT574BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74AHCT574BQ,115 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 74AHCT574BQ,115 meets industry standards.
7.What is the process for return or replacement of 74AHCT574BQ,115?
All 74AHCT574BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT574BQ,115, 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 74AHCT574BQ,115 part is unused and in its original packaging.
Return procedure for 74AHCT574BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74AHCT574BQ,115 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…
