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Nexperia USA Inc. 74HCT02BZZ
- Part No.:
- 74HCT02BZZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Gates and Inverters
- Package:
- 14-XFQFN Exposed Pad
- Datasheet:
-
74HCT02BZZ.pdf
- Description:
- IC GATE NOR 4CH 2-INP 14DHXQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
74HCT02BZZ from Nexperia is a quad 2-input NOR gate logic IC with TTL-compatible input thresholds, 4.5 V to 5.5 V supply range, -40 °C to +125 °C operating temperature, and DHXQFN14 (2 mm × 2 mm × 0.48 mm) package. It delivers 11 ns typical propagation delay at 4.5 V, supports 5.2 mA output drive, and integrates input clamp diodes for overvoltage-tolerant interfacing in industrial control and digital signal routing applications.
For engineers reviewing the 74HCT02BZZ datasheet, 74HCT02BZZ pinout, 74HCT02BZZ application, or 74HCT02BZZ equivalent, this page provides verified functional role, real-world timing behavior, thermal-enhanced QFN package constraints, and direct substitution guidance for legacy 74-series NOR gate designs.
Technical Context
This device implements four independent 2-input NOR gates in a single monolithic CMOS structure with TTL-level input compatibility-VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V-enabling direct interface with legacy 5 V TTL logic without level shifters. Each gate exhibits symmetrical HIGH/LOW output drive capability (IOH = -4.0 mA, IOL = 5.2 mA) under standard load conditions.
Its DHXQFN14 package (SOT8014-1) features 14 terminals on 0.4 mm pitch, thermally enhanced construction, and an exposed die pad (non-soldered by default) optimized for compact high-density PCB layouts requiring low-inductance grounding and improved thermal dissipation in space-constrained embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Quad 2-input NOR gate - four independent gates, each implementing Y = NOT(A OR B) |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL systems and stable operation across industrial voltage tolerances |
| Propagation Delay | 11 ns (typ) at VCC = 4.5 V, CL = 50 pF - enables reliable timing in sub-10 MHz synchronous logic and combinatorial control paths |
| Output Drive | ±4.0 mA / ±5.2 mA (IOH/IOL) - sufficient to directly drive multiple 74-series inputs or small LED indicators without buffering |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - matches TTL logic families, eliminating need for external level translation circuitry |
| Operating Temperature | -40 °C to +125 °C - qualified for extended-temperature industrial, automotive under-hood adjacent, and power supply control applications |
| Package | DHXQFN14 (SOT8014-1), 2.0 mm × 2.0 mm × 0.48 mm - ultra-compact leadless package supporting high-density routing and improved thermal performance vs. SO14/TSSOP |
Pinout & Package
DHXQFN14 (SOT8014-1) package: 14-terminal, leadless, 0.4 mm pitch, 2 mm × 2 mm body, exposed thermal pad (non-electrical unless connected to GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1Y (Gate 1 Output) | Active-low NOR output; sinks 5.2 mA or sources -4.0 mA into 50 pF load |
| 2 | 1A (Gate 1 Input A) | TTL-compatible input; accepts 0.8 V max LOW and 2.0 V min HIGH at 5 V supply |
| 3 | 1B (Gate 1 Input B) | Second TTL-compatible input for Gate 1; electrically identical to Pin 2 |
| 4 | 2Y (Gate 2 Output) | Independent NOR output; shares same electrical specs as Pin 1 |
| 5 | 2A (Gate 2 Input A) | Input for Gate 2; no internal connection to other gates |
| 6 | 2B (Gate 2 Input B) | Second input for Gate 2; fully isolated from Gate 1 signals |
| 7 | GND | Primary ground reference; connects to exposed thermal pad (optional GND tie) |
| 8 | 3A (Gate 3 Input A) | Input for third NOR gate; identical VIH/VIL and loading behavior |
| 9 | 3B (Gate 3 Input B) | Second input for Gate 3; supports independent logic evaluation |
| 10 | 3Y (Gate 3 Output) | Third NOR output; capable of driving same loads as Pins 1 and 4 |
| 11 | 4A (Gate 4 Input A) | Input for fourth NOR gate; no shared resources with other gates |
| 12 | 4B (Gate 4 Input B) | Second input for Gate 4; completes quad-gate functionality |
| 13 | 4Y (Gate 4 Output) | Final NOR output; functionally identical to all other outputs |
| 14 | VCC | Positive supply rail; must be decoupled locally with ≤100 nF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH ≥ 2.0 V and VIL ≤ 0.8 V at 5 V supply-enables plug-in replacement of 74LS02 without redesign |
| Ultra-compact thermal package | DHXQFN14 (2 mm × 2 mm) with 0.4 mm pitch and exposed pad-reduces board area by >60% vs. SO14 and improves thermal resistance |
| Industrial temperature range | -40 °C to +125 °C operation-supports deployment in motor drives, PLC I/O modules, and power converter supervision circuits |
| Input clamp diodes | Integrated protection allows use of current-limiting resistors for interfacing to voltages exceeding VCC-simplifies mixed-voltage system integration |
| Low dynamic power | CPD = 24 pF-limits switching power to <1 mW at 1 MHz with 5 V supply, critical for battery-backed or energy-sensitive subsystems |
Applications
| Industrial Control Logic | Digital Signal Routing |
|---|---|
Use Scenario: Discrete safety interlock monitoring in programmable logic controller (PLC) backplane modules where redundant sensor inputs must inhibit actuator enable signals. IC Role / Device Role / Timing Role: NOR gate implements active-low "any fault" detection: two sensor inputs feed one gate; output asserts LOW only when both are HIGH (fault condition). Use Value: Eliminates need for external pull-up resistors or Schmitt triggers due to guaranteed TTL-compatible thresholds and noise-immune 1.2 V input hysteresis margin. |
Use Scenario: Bus arbitration logic in multi-master microcontroller subsystems sharing a common UART or SPI line. IC Role / Device Role / Timing Role: Four NOR gates configure priority encoder logic to resolve contention: each master's request signal feeds a dedicated gate, with outputs combined to generate grant pulses. Use Value: 11 ns propagation delay ensures deterministic arbitration within 25 ns window-critical for maintaining <100 kHz bus clock integrity without added latency. |
| Power Supply Sequencing | Legacy System Interface |
Use Scenario: Enabling/disabling auxiliary rails (e.g., FPGA configuration voltage) based on primary DC-DC converter OK status and thermal shutdown flag. IC Role / Device Role / Timing Role: Dual-NOR configuration acts as AND-NOT gate: both "OK" and "not overtemp" inputs yield active-HIGH enable signal after inversion. Use Value: Guaranteed -40 °C to +125 °C operation ensures correct sequencing during cold-start and thermal stress events in telecom rectifier units. |
Use Scenario: Interfacing modern microcontrollers with legacy 74LS-based peripheral cards lacking level-shifting circuitry. IC Role / Device Role / Timing Role: Replaces obsolete 74LS02 in address decoding or chip-select generation, accepting 3.3 V MCU outputs while driving 5 V TTL loads. Use Value: TTL input thresholds and 5.2 mA sink capability allow direct connection-no external transistors or voltage translators required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad NOR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT02D (SO14) | Same logic function and electrical specs, but SO14 package (8.75 mm × 3.9 mm) with gull-wing leads and higher thermal resistance (10.1 mW/K derating above 100 °C) | Better suited for through-hole prototyping, manual rework, or legacy PCB footprints requiring 14-pin DIP-compatible layout | Select when board space permits larger footprint and hand-soldering or socketing is required |
| SN74HCT02DR (TSSOP14) | Identical logic and DC specs, TSSOP14 package (5.1 mm × 4.4 mm), 0.65 mm pitch, 7.3 mW/K thermal derating above 81 °C | Offers intermediate size and reflow compatibility between SO14 and DHXQFN14; slightly lower thermal performance than BZ variant | Choose for cost-sensitive volume production where DHXQFN14 assembly infrastructure is unavailable |
Compared with 74HCT02D and SN74HCT02DR, the 74HCT02BZZ provides the smallest footprint and best thermal efficiency-critical for fanless industrial edge controllers-but requires fine-pitch reflow capability and careful stencil design for the exposed pad.
Availability
74HCT02BZZ is available at Aetrix Electronics and suitable for industrial control logic, digital signal routing, and power supply sequencing requiring stable component supply across extended temperature ranges and high-density packaging.
Supply support for 74HCT02BZZ 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 focused on high-volume, high-reliability logic, analog, and discrete components for industrial, automotive, and consumer markets.
The 74HCT02BZZ belongs to Nexperia's 74HCT logic family-designed specifically for robust 5 V TTL interoperability in harsh environments, with emphasis on ESD resilience, latch-up immunity, and extended temperature qualification.
FAQ
Is the exposed thermal pad on the 74HCT02BZZ electrically connected to GND?
No-the exposed pad (Pin 1 index area) is not internally connected to any circuit node. Per Nexperia's datasheet, it may remain floating or be soldered to GND for thermal improvement, but no electrical requirement exists. If connected, ensure the PCB land is either unconnected or tied solely to the GND plane with no signal traces.
Can 74HCT02BZZ operate reliably at 3.3 V supply?
No-it is specified only for 4.5 V to 5.5 V operation. At 3.3 V, input thresholds (VIH = 2.0 V min) become marginal, and output drive degrades significantly below specification. For 3.3 V systems, use 74LVC02 or 74AHC02 variants instead.
What is the maximum capacitive load this device can drive while maintaining timing specs?
The 11 ns typical propagation delay is characterized at CL = 50 pF. Driving >50 pF increases tpd nonlinearly; at 100 pF, delay exceeds 24 ns. For loads >50 pF, add series termination or buffer stages to maintain setup/hold margins in synchronous designs.
Does this part include input hysteresis for noise rejection?
No-74HCT02BZZ has standard CMOS input structure without Schmitt-trigger hysteresis. Its noise immunity stems from high DC noise margins (VNH = 1.2 V, VNL = 1.2 V at 5 V), not dynamic hysteresis. For noisy environments, external RC filtering or dedicated Schmitt-trigger gates (e.g., 74HCT14) are recommended.
74HCT02BZZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 14-XFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- NOR Gate
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- Features:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Max):
- 2 µA
- Current - Output High, Low:
- 4mA, 5.2mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 1.6V
- Max Propagation Delay @ V, Max CL:
- 19ns @ 4.5V, 50pF
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-DHXQFN (2x2)
74HCT02BZZ FAQ
1.How can I place an order for 74HCT02BZZ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT02BZZ 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 74HCT02BZZ reliable?
The price and inventory of 74HCT02BZZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT02BZZ is usually 5 days.
3.What payment methods are accepted for 74HCT02BZZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT02BZZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT02BZZ?
74HCT02BZZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT02BZZ 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 74HCT02BZZ?
For technical support, including 74HCT02BZZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT02BZZ requirements.
6.How does Aetrix verify that 74HCT02BZZ is sourced from the original manufacturer or authorized distributors?
All 74HCT02BZZ 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 74HCT02BZZ meets industry standards.
7.What is the process for return or replacement of 74HCT02BZZ?
All 74HCT02BZZ units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT02BZZ, 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 74HCT02BZZ part is unused and in its original packaging.
Return procedure for 74HCT02BZZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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