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Nexperia USA Inc. 74HCT27BQ,115
- Part No.:
- 74HCT27BQ,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Gates and Inverters
- Package:
- 14-VFQFN Exposed Pad
- Datasheet:
-
74HCT27BQ,115.pdf
- Description:
- IC GATE NOR 3CH 3-INP 14DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,530
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Product details
Overview
74HCT27BQ,115 from Nexperia is a triple 3-input NOR gate logic IC with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), 125 °C operational rating, DHVQFN14 (SOT762-1) package, and propagation delay of 12–32 ns across temperature and supply conditions. It serves as a discrete combinational logic building block in industrial control sequencers, power-on reset combiners, and bus arbitration circuits.
For engineers reviewing the 74HCT27BQ,115 datasheet, 74HCT27BQ,115 pinout, 74HCT27BQ,115 application, or 74HCT27BQ,115 equivalent, key selection criteria include TTL-level input compatibility, -40 °C to +125 °C ambient operation, DHVQFN thermal performance, and guaranteed 4 mA output drive capability at 5 V.
Technical Context
This device implements three independent 3-input NOR gates in a single monolithic CMOS structure with integrated input clamp diodes enabling safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Each gate exhibits symmetrical HIGH/LOW output voltage specifications (VOH ≥ 3.98 V, VOL ≤ 0.4 V at IO = ±4 mA, VCC = 4.5 V).
It operates within a strict 4.5–5.5 V supply range for TTL compatibility, delivers static input leakage < ±1.0 μA over full temperature range, and maintains dynamic performance via CPD = 30 pF - enabling accurate dynamic power estimation using PD = CPD × VCC² × fi × N.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Triple 3-input NOR: Y = NOT(A OR B OR C), fully independent per gate |
| Supply Voltage | 4.5 V to 5.5 V - ensures robust TTL-level signal compatibility without level-shifting |
| Propagation Delay | 12–32 ns (tpd, nA/nB/nC → nY) - specified at VCC = 4.5 V, CL = 15 pF, -40 °C to +125 °C |
| Output Drive | ±4.0 mA - supports direct fan-out to 10 LS-TTL loads or driving 50 Ω transmission lines |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - matches standard TTL logic families without interface circuitry |
| Operating Temperature | -40 °C to +125 °C - qualified for extended industrial and under-hood applications |
| Power Dissipation Cap | 500 mW (Ptot, derates 9.6 mW/K above 98 °C) - enables sustained operation in thermally constrained PCB layouts |
Pinout & Package
DHVQFN14 (SOT762-1) package: 2.5 mm × 3.0 mm × 0.85 mm body, no leads, exposed thermal pad (non-soldered by default), 14 terminals, terminal 1 index area marked.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 2A, 3A | Data input (Gate 1–3 A) | Three independent first inputs per NOR gate; accept TTL-level signals directly |
| 1B, 2B, 3B | Data input (Gate 1–3 B) | Three independent second inputs; internally clamped to support overvoltage-safe interfacing |
| 1C, 2C, 3C | Data input (Gate 1–3 C) | Three independent third inputs; enable full 3-input NOR functionality per gate |
| 1Y, 2Y, 3Y | Data output (Gate 1–3 Y) | Active-low outputs with rail-to-rail swing; VOH ≥ 3.98 V / VOL ≤ 0.4 V @ 4 mA |
| 7 | GND | Ground reference (0 V); required for all DC bias and noise immunity |
| 14 | VCC | Positive supply (4.5–5.5 V); powers all three gates and internal clamp structures |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 4.5–5.5 V - eliminates need for external level shifters when interfacing with legacy TTL systems |
| Input clamp diodes | Integrated protection enabling safe connection to signals up to VCC + 0.5 V using series current-limiting resistors |
| High noise immunity | Typical noise margin > 1.2 V (VNH = VOH − VIH, VNL = VIL − VOL) ensures reliable operation in electrically noisy industrial environments |
| Extended temperature range | -40 °C to +125 °C operation - validated for use in motor drives, PLC I/O modules, and power supply supervision circuits |
| Low quiescent current | ICC ≤ 40 μA max at VCC = 5.5 V, full temperature range - reduces standby power in always-on control logic |
Applications
| Industrial PLC Input Logic | Power Sequencing Supervisor |
|---|---|
|
Use Scenario: Combining multiple sensor fault signals (e.g., overtemperature, overcurrent, communication timeout) into a single hardware shutdown request. IC Role / Device Role / Timing Role: 3-input NOR gate performing active-low wired-OR fault aggregation; no timing-critical path. Use Value: Eliminates need for microcontroller polling or external diode-OR networks - provides deterministic, zero-latency hardware fail-safe response. |
Use Scenario: Enabling downstream DC-DC converters only after primary rail (e.g., +12 V) stabilizes and secondary rails (+5 V, +3.3 V) are confirmed valid. IC Role / Device Role / Timing Role: Gate combining delayed enable signals and undervoltage lockout flags to generate synchronized power-good assertion. Use Value: Ensures strict sequencing compliance without software intervention; propagation delay < 32 ns prevents race conditions during startup. |
| Bus Arbitration Combiner | Legacy System Glue Logic |
|
Use Scenario: Resolving simultaneous bus request signals from three peripheral controllers competing for shared memory or I/O bus access. IC Role / Device Role / Timing Role: NOR-based priority encoder front-end generating grant signals based on fixed hardware priority order. Use Value: Provides deterministic, sub-35 ns arbitration decision - faster than typical microcontroller interrupt latency and immune to firmware hangs. |
Use Scenario: Interfacing modern microcontrollers with older TTL-based peripheral cards requiring active-low strobes and handshaking signals. IC Role / Device Role / Timing Role: Level-translating and signal-inverting logic element converting CMOS outputs to TTL-compatible active-low control lines. Use Value: Achieves drop-in compatibility without external resistors or buffers - VIH/VIL specs match 74LS family thresholds exactly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple 3-input NOR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT27DR | SO-14 (SOT108-1) package; 10.1 mW/K thermal derating above 100 °C vs. 9.6 mW/K for DHVQFN | Larger footprint and lower thermal efficiency; suitable where reflow compatibility with legacy SOIC footprints is mandatory | Select when board layout requires through-hole or SOIC-reflow compatibility and thermal load is moderate |
| MC74HCT27ADTR2G | TSOP-14 (SOT402-1); 7.3 mW/K derating above 81 °C; identical electrical specs but tighter 1.2 mm body width | Better fit in space-constrained designs but reduced thermal mass limits sustained high-current operation | Select when PCB real estate is critical and peak output loading remains below 3 mA average |
Compared with SN74HCT27DR and MC74HCT27ADTR2G, the 74HCT27BQ,115 offers superior thermal performance in compact layouts due to its exposed-pad DHVQFN construction, while maintaining identical logic behavior and TTL interface compatibility - making it optimal for high-density industrial control modules.
Availability
74HCT27BQ,115 is available at Aetrix Electronics and suitable for industrial PLC input logic, power sequencing supervisors, bus arbitration combiners, and legacy system glue logic requiring stable component supply across extended temperature ranges.
Supply support for 74HCT27BQ,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, analog, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in high-volume industrial and automotive applications.
The 74HCT27 belongs to Nexperia's industry-standard 74HCT logic family, engineered specifically for seamless interoperability with legacy TTL systems while leveraging modern CMOS process advantages in power and speed.
FAQ
Can 74HCT27BQ,115 operate at 3.3 V supply?
No. The 74HCT27BQ,115 is specified only for 4.5 V to 5.5 V operation to ensure TTL-level input compatibility. At 3.3 V, VIH minimum (2.0 V) would exceed 60% of VCC, violating recommended operating conditions and risking unreliable HIGH detection. Use 74HC27 variants for 2.0–6.0 V wide-supply operation instead.
Is the exposed thermal pad on the DHVQFN package required to be soldered?
No. Per Nexperia's datasheet note, the exposed pad has no electrical or mechanical requirement to be soldered. If soldered, it must remain floating or be connected to GND - it is not internally tied to any signal or power net. Thermal performance improvement is marginal unless actively heatsinked.
What is the maximum capacitive load this device can drive reliably?
The 74HCT27BQ,115 is characterized up to 50 pF load capacitance in dynamic testing (Table 9). For reliable operation beyond 15 pF, transition times increase linearly - e.g., tt rises from 7 ns (15 pF) to ~19 ns (50 pF) at VCC = 4.5 V. Layout-induced trace capacitance must be included in total CL budget.
Does this part support hot insertion or live insertion into a powered backplane?
No. The 74HCT27BQ,115 lacks hot-swap protection circuitry. Its input clamp diodes are rated for transient overvoltage only when series current limiting is applied (per Section 1 General Description). Direct hot insertion risks latch-up or permanent damage due to uncontrolled inrush current into VCC or GND pins.
74HCT27BQ,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
- Logic Type:
- NOR Gate
- Number of Circuits:
- 3
- Number of Inputs:
- 3
- Features:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Max):
- 2 µA
- Current - Output High, Low:
- 4mA, 4mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 21ns @ 4.5V, 50pF
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-DHVQFN (2.5x3)
74HCT27BQ,115 FAQ
1.How can I place an order for 74HCT27BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT27BQ,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 74HCT27BQ,115 reliable?
The price and inventory of 74HCT27BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT27BQ,115 is usually 5 days.
3.What payment methods are accepted for 74HCT27BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT27BQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT27BQ,115?
74HCT27BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT27BQ,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 74HCT27BQ,115?
For technical support, including 74HCT27BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT27BQ,115 requirements.
6.How does Aetrix verify that 74HCT27BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74HCT27BQ,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 74HCT27BQ,115 meets industry standards.
7.What is the process for return or replacement of 74HCT27BQ,115?
All 74HCT27BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT27BQ,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 74HCT27BQ,115 part is unused and in its original packaging.
Return procedure for 74HCT27BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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