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Nexperia USA Inc. 74HCT74BQ,115
- Part No.:
- 74HCT74BQ,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Flip Flops
- Package:
- 14-VFQFN Exposed Pad
- Datasheet:
-
74HCT74BQ,115.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,351
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Product details
Overview
74HCT74BQ,115 from Nexperia is a dual positive-edge-triggered D-type flip-flop with independent asynchronous set (nSD) and reset (nRD) inputs, complementary Q/nQ outputs per section, TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), and operation over -40 °C to +125 °C. It enables synchronous data latching in clock-domain crossing, state retention, and edge-sensitive control logic in industrial PLC I/O modules.
For engineers reviewing the 74HCT74BQ,115 datasheet, 74HCT74BQ,115 pinout, 74HCT74BQ,115 application, or 74HCT74BQ,115 equivalent, this device serves as a robust, temperature-stable, dual-register building block for digital control systems requiring precise timing alignment, metastability mitigation, and noise-immune level translation between TTL and CMOS domains.
Technical Context
The 74HCT74BQ,115 implements two independent D-flip-flops sharing no internal coupling-each with dedicated nD, nCP, nSD, nRD, nQ, and nQ terminals. Its Schmitt-trigger clock input ensures reliable triggering even with slow-rising edges (Δt/ΔV down to 139 ns/V at VCC = 4.5 V), while clamp diodes on all inputs permit safe interfacing to voltages exceeding VCC via current-limiting resistors.
Functionally, it operates strictly on LOW-to-HIGH clock transitions; data at nD is captured only when setup (tsu = 15 ns min at VCC = 4.5 V) and hold (th = 3 ns min) times are met. Asynchronous nSD/nRD override clock action, forcing nQ HIGH or LOW respectively, with recovery time trec = 8 ns min before next valid clock edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL logic rails and stable operation across industrial voltage tolerances. |
| Propagation Delay (tpd) | 18 ns to 53 ns (VCC = 4.5 V, CL = 50 pF) - Determines maximum achievable clock frequency (fmax = 22 MHz min) in synchronous logic chains. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Guarantees direct interoperability with legacy 5 V TTL outputs without level-shifting circuitry. |
| Output Drive | ±4 mA (VOH/VOL @ VCC = 4.5 V) - Sufficient to drive multiple 74-series inputs or small capacitive loads (< 50 pF) without fanout degradation. |
| Operating Temperature | -40 °C to +125 °C - Validated for under-hood automotive ECUs, motor drives, and industrial controllers exposed to thermal cycling. |
| Power Dissipation | ICC ≤ 80 μA (static, VCC = 5.5 V) - Enables low-quiescent-power operation in battery-backed or energy-constrained subsystems. |
| ESD Robustness | HBM > 2000 V, CDM > 1000 V - Reduces risk of field failure during PCB handling and system integration in unshielded environments. |
Pinout & Package
DHVQFN14 (SOT762-1) package: 2.5 mm × 3.0 mm × 0.85 mm body, 0.5 mm pitch, 14-terminal leadless construction with exposed thermal pad (non-soldered or GND-connected). Optimized for high-density routing and improved thermal performance over SO14/TSSOP variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1RD | Asynchronous reset (active LOW) | Forces 1Q LOW independently of clock; critical for power-on initialization and fault recovery in safety-critical logic. |
| 1D | Data input (Channel 1) | Sampled on rising edge of 1CP; must be stable ≥15 ns before and ≥3 ns after clock transition. |
| 1CP | Clock input (Channel 1) | Schmitt-triggered; accepts slow edges (≥139 ns/V rise/fall); defines timing reference for Channel 1 register. |
| 1SD | Asynchronous set (active LOW) | Forces 1Q HIGH regardless of clock or data; used for preset states in finite-state machines. |
| 1Q / 1Q | True/complement outputs (Channel 1) | Provide differential signaling capability; enable direct connection to downstream logic or bus drivers. |
| GND (Pin 7) | Ground reference | Primary return path for all internal switching currents; requires low-inductance PCB plane connection. |
| VCC (Pin 14) | Supply voltage | Must be decoupled with ≥100 nF ceramic capacitor within 3 mm of pin to suppress supply bounce during output transitions. |
| 2Q / 2Q | True/complement outputs (Channel 2) | Electrically isolated from Channel 1; supports independent clock domains or mirrored signal paths. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible input levels | Enables direct interface to legacy microcontrollers, FPGAs, and peripheral ICs without external level shifters. |
| Schmitt-trigger clock input | Eliminates need for external RC filtering on noisy clock lines; supports reliable operation with rise/fall times up to 20 ns. |
| Asynchronous set/reset per channel | Allows independent initialization or forced state override-essential for watchdog timers and error-handling circuits. |
| High noise immunity (CMOS design) | Input hysteresis ≥0.4 V and VIH/VIL margins ensure robust operation in electrically noisy industrial enclosures. |
| Thermally enhanced DHVQFN package | 0.85 mm profile and exposed pad reduce junction-to-ambient thermal resistance by ~30% vs. TSSOP14, enabling higher sustained clock rates. |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Latching sensor status (e.g., door open/closed, seatbelt fastened) across intermittent power cycles and CAN message gaps. IC Role / Device Role / Timing Role: Dual-channel register holding persistent state until next valid CAN frame update; nSD/nRD used for master reset on ignition cycle. Use Value: Eliminates need for external nonvolatile memory or microcontroller polling-reducing BOM count and firmware complexity. |
Use Scenario: Debouncing mechanical switch inputs (headlight toggle, wiper speed selector) before feeding to MCU GPIO. IC Role / Device Role / Timing Role: Edge-triggered sampling synchronized to internal 10 kHz timer clock; asynchronous reset clears metastability on switch bounce. Use Value: Achieves <10 µs debounce window with deterministic timing-superior to software-based solutions vulnerable to interrupt latency. |
| Motor Drive Gate Control Logic | Test Equipment Pattern Generators |
|
Use Scenario: Generating complementary PWM enable signals for half-bridge MOSFET drivers with dead-time insertion. IC Role / Device Role / Timing Role: Dual DFF configured as toggle flip-flop and delay element to enforce minimum off-time between high-side and low-side gate activation. Use Value: Prevents shoot-through current without requiring precision analog delay components or complex FPGA logic. |
Use Scenario: Constructing programmable 4-bit pattern generators for IC functional validation using minimal external components. IC Role / Device Role / Timing Role: Cascaded 74HCT74BQ units implement shift registers and state machines; TTL inputs accept direct connection to benchtop pulse generators. Use Value: Enables rapid test fixture prototyping with zero custom firmware-reducing validation cycle time by >40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT74DR (TI) | SOIC-14 package; identical electrical specs but larger footprint (8.75 mm × 3.9 mm) and higher thermal resistance. | Limited to space-tolerant designs; unsuitable for compact motor control boards or automotive modules with strict volume constraints. | Select when board real estate is abundant and hand-soldering or legacy reflow profiles are required. |
| 74HCT74PW,118 (Nexperia) | TSSOP-14 package (4.4 mm width); same die but 0.65 mm pitch and 1.2 mm height-lower profile than SOIC but taller than DHVQFN. | Better density than SOIC but inferior thermal performance vs. DHVQFN; not recommended for >25 MHz continuous operation. | Choose for mid-density layouts where thermal load is moderate and JEDEC-standard TSSOP tooling is already deployed. |
Compared with SN74HCT74DR and 74HCT74PW,118, the 74HCT74BQ,115 delivers superior thermal management and smallest PCB area-critical for high-reliability automotive and industrial applications where ambient temperatures exceed 105 °C and board space is constrained.
Availability
74HCT74BQ,115 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, motor drive gate control logic, and test equipment pattern generators requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT74BQ,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, reliable, and efficient logic, analog, and discrete components for automotive, industrial, and consumer markets.
The 74HCT74BQ,115 belongs to Nexperia's industry-standard 74HCT logic family-designed specifically for seamless TTL-to-CMOS interfacing in harsh-environment digital control systems demanding wide temperature range and high noise immunity.
FAQ
Is the 74HCT74BQ,115 pin-compatible with the 74HC74BQ variant?
No-the 74HCT74BQ,115 uses TTL-compatible input thresholds (VIH = 2.0 V min), while the 74HC74BQ requires CMOS-level inputs (VIH = 3.15 V min at VCC = 4.5 V). Swapping them risks logic misreads when driven by 5 V TTL sources, as the HC version may interpret marginal HIGH signals as LOW.
Can the exposed thermal pad on the DHVQFN package be left unconnected?
Yes-the exposed pad (Pin 1 index area) has no electrical function and may remain floating. If soldered, it must connect only to GND or remain isolated; connecting to any other net violates the datasheet's mechanical and thermal specifications and risks latch-up or parametric shift.
What is the minimum clock pulse width required for reliable operation?
The minimum HIGH and LOW clock pulse widths are both 23 ns at VCC = 4.5 V (tW parameter). Violating this-e.g., using sub-20 ns pulses-causes metastability or skipped state transitions, especially under temperature extremes or voltage droop conditions.
Does the 74HCT74BQ,115 support hot-swap or live-insertion?
No-it lacks hot-swap protection circuitry. Applying VCC before GND or sequencing power to VCC/GND out-of-spec (e.g., VCC ramping before GND stabilizes) can cause latch-up or permanent damage due to internal parasitic SCR activation, as confirmed in JESD78 Class II Level B testing.
74HCT74BQ,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 14-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 59 MHz
- Max Propagation Delay @ V, Max CL:
- 44ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 40 µA
- Input Capacitance:
- 3.5 pF
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-DHVQFN (2.5x3)
74HCT74BQ,115 FAQ
1.How can I place an order for 74HCT74BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT74BQ,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 74HCT74BQ,115 reliable?
The price and inventory of 74HCT74BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT74BQ,115 is usually 5 days.
3.What payment methods are accepted for 74HCT74BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT74BQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT74BQ,115?
74HCT74BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT74BQ,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 74HCT74BQ,115?
For technical support, including 74HCT74BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT74BQ,115 requirements.
6.How does Aetrix verify that 74HCT74BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74HCT74BQ,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 74HCT74BQ,115 meets industry standards.
7.What is the process for return or replacement of 74HCT74BQ,115?
All 74HCT74BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT74BQ,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 74HCT74BQ,115 part is unused and in its original packaging.
Return procedure for 74HCT74BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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