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onsemi MC74HC02AD
- Part No.:
- MC74HC02AD
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC74HC02AD.pdf
- Description:
- IC GATE NOR 4CH 2-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,922
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Product details
Overview
MC74HC02AD from onsemi is a quad 2-input NOR gate in SOIC-14 package, operating from 2.0 V to 6.0 V, delivering 10 LSTTL loads, with propagation delay as low as 13 ns at 6.0 V, and AEC-Q100 qualified for automotive applications.
For engineers reviewing the MC74HC02AD datasheet, pinout, applications, or equivalent options, this device serves as a high-noise-immunity CMOS logic gate compatible with TTL and CMOS interfaces, supporting industrial control, sensor signal conditioning, and automotive body electronics where robust level-shifting and rail-to-rail operation are required.
Technical Context
The MC74HC02AD implements four independent 2-input NOR gates using high-performance silicon-gate CMOS technology, with inputs tolerant of LSTTL levels when pullup resistors are used and fully compatible with standard CMOS outputs. Its logic function Y = A + B (NOR) is implemented with complementary MOSFET pairs per gate.
It features low input current (±1.0 µA max), high noise immunity, JEDEC Std. 7.0A compliance, and operates across –55°C to +125°C ambient temperature. The device supports mixed-voltage interfacing due to its wide 2.0–6.0 V supply range and rail-referenced input thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Quad 2-input NOR (Y = A + B) |
| Supply Voltage Range | 2.0 V to 6.0 V - enables direct interface with 3.3 V and 5 V systems without level shifters |
| Propagation Delay | 13 ns max at VCC = 6.0 V - supports >30 MHz toggle rates in critical timing paths |
| Output Drive | 10 LSTTL loads - sufficient to drive legacy TTL inputs directly without buffers |
| Input Leakage | ±1.0 µA max at VCC = 6.0 V - ensures stable logic states with high-impedance sources |
| Operating Temperature | –55°C to +125°C - validated for under-hood automotive and industrial environments |
| ESD Rating | HBM > 2000 V - provides robust handling during board assembly and field service |
Pinout & Package
MC74HC02AD is housed in a 14-pin SOIC package (Case 751A), with 1.27 mm pitch, 8.55–8.75 mm body width, and Pb-free construction. Pin 1 is index-marked; Pin 7 is GND; Pin 14 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 8, 9, 11, 12 | Input (A1/B1/A2/B2/A3/B3/A4/B4) | CMOS-compatible inputs accepting 0–VCC logic levels; unused pins must be tied to VCC or GND |
| 3, 6, 10, 13 | Output (Y1/Y2/Y3/Y4) | Push-pull CMOS outputs capable of sourcing/sinking ±25 mA per pin |
| 7 | GND | Ground reference for all internal circuitry and I/O; requires low-impedance connection |
| 14 | VCC | Primary power supply input; decoupling capacitor (0.1 µF) recommended adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input voltage tolerance | Inputs accept VI from –0.5 V to VCC + 0.5 V - prevents latch-up during transient overvoltage |
| Low quiescent supply current | ICC ≤ 1.0 µA at 25°C - enables use in battery-backed or ultra-low-power monitoring circuits |
| High noise immunity | Typical noise margin > 40% of VCC - suppresses false triggering in electrically noisy engine bays or factory floors |
| AEC-Q100 qualification | Qualified to Grade 1 (–40°C to +125°C) with PPAP capability - meets automotive OEM production requirements |
| Pb-free and RoHS compliant | Meets UL 94 V-0 flammability rating and oxygen index 28–34 - satisfies global environmental and safety mandates |
Applications
| Industrial PLC Logic | Automotive Body Control |
|---|---|
Use Scenario: Discrete safety interlock monitoring in programmable logic controllers, where redundant NOR-based voting logic validates emergency stop signals. IC Role / Device Role / Timing Role: Performs real-time combinational logic evaluation with sub-15 ns latency, ensuring deterministic response within hard real-time scan cycles. Use Value: Eliminates need for external level-shifting or buffering when interfacing 24 V sensor inputs via resistor dividers into 5 V logic rails. | Use Scenario: Door lock actuation arbitration in centralized body control modules, resolving conflicting lock/unlock commands from key fob, door handle, and ignition status. IC Role / Device Role / Timing Role: Implements priority-encoded NOR logic to resolve simultaneous inputs without race conditions or metastability. Use Value: AEC-Q100 qualification and –55°C to +125°C operation ensure reliable function across extreme thermal cycling in vehicle cabin and exterior zones. |
| Sensor Signal Conditioning | Legacy System Interface |
Use Scenario: Active low-pass filtering and signal inversion for analog sensor outputs digitized by microcontrollers with limited GPIO resources. IC Role / Device Role / Timing Role: Provides clean, glitch-free inverted logic edges for zero-crossing detection or threshold comparison outputs. Use Value: Low input current (<1 µA) prevents loading of high-impedance sensor bridges or op-amp outputs. | Use Scenario: Interfacing modern 3.3 V microcontrollers to legacy 5 V TTL peripherals such as UART transceivers or display drivers. IC Role / Device Role / Timing Role: Acts as bidirectional level translator and logic inverter, leveraging CMOS input compatibility and TTL-output drive strength. Use Value: Output drive of 10 LSTTL loads allows direct fanout to multiple legacy devices without buffer ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad NOR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC02DR | TI part; identical logic function, same SOIC-14 package, but rated only to +85°C industrial range (not AEC-Q100) | Lacks automotive qualification and extended temperature support; unsuitable for under-hood deployment | Select when cost sensitivity outweighs automotive compliance and full temperature range is not required |
| 74VHC02M | ON Semiconductor's higher-speed VHC variant; 7.5 ns max tPD at 5 V, but lower noise margin and no AEC-Q100 certification | Better speed performance but reduced noise immunity; not approved for automotive PPAP programs | Choose for non-automotive high-speed digital systems where propagation delay is critical and EMI environment is controlled |
Compared with SN74HC02DR and 74VHC02M, the MC74HC02AD uniquely combines AEC-Q100 qualification, full –55°C to +125°C operation, and proven reliability in automotive body electronics - making it the only option among the three qualified for production-critical vehicle subsystems requiring PPAP documentation.
Availability
MC74HC02AD is available at Aetrix Electronics and suitable for industrial PLC logic, automotive body control, sensor signal conditioning, and legacy system interface applications requiring stable component supply and long-term lifecycle support.
Supply support for MC74HC02AD 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74HC02AD belongs to the 74HC logic family, designed specifically for high-reliability, mixed-voltage digital interfacing in harsh environments - emphasizing noise immunity, wide supply range, and automotive-grade qualification.
FAQ
What is the maximum operating temperature range for the MC74HC02AD?
The MC74HC02AD is specified for operation from –55°C to +125°C ambient temperature, meeting AEC-Q100 Grade 1 requirements. This range is validated across all electrical parameters in the datasheet, including propagation delay, output drive, and input thresholds. The MC74HC02AD maintains guaranteed functionality throughout this span without derating, making it suitable for under-hood automotive locations and industrial enclosures exposed to thermal extremes.
Is the MC74HC02AD pin-compatible with TTL NOR gates like the 74LS02?
Yes, the MC74HC02AD is explicitly designed to be pinout-identical to the 74LS02, as confirmed in the datasheet's first sentence. All 14 pins match function-for-function: inputs A1–B4, outputs Y1–Y4, VCC, and GND occupy identical positions. However, while pinout matches, the MC74HC02AD requires appropriate pullup resistors for LSTTL input compatibility and operates over a wider voltage range (2.0–6.0 V vs. 4.75–5.25 V).
Does the MC74HC02AD support mixed-voltage interfacing between 3.3 V and 5 V systems?
Yes, the MC74HC02AD supports mixed-voltage interfacing: its 2.0–6.0 V supply range allows operation at either 3.3 V or 5 V, and its CMOS inputs accept logic-high thresholds as low as 1.5 V (at VCC = 2.0 V) and as high as 4.2 V (at VCC = 6.0 V). When powered at 3.3 V, it reliably accepts 5 V-tolerant inputs only if clamped or current-limited - direct 5 V input without protection violates the VI specification of –0.5 V to VCC + 0.5 V.
What is the recommended decoupling for the MC74HC02AD in high-speed applications?
A 0.1 µF ceramic capacitor placed as close as possible to the VCC (Pin 14) and GND (Pin 7) pins is the minimum recommended decoupling for the MC74HC02AD. For systems with multiple gates switching simultaneously or operating above 10 MHz, add a bulk 4.7 µF–10 µF tantalum or aluminum electrolytic capacitor near the power entry point. Layout best practices include short, wide traces to minimize inductance and avoid shared return paths with noisy digital or power circuits.
How does the MC74HC02AD handle unused inputs and outputs?
Per the datasheet's Recommended Operating Conditions note, all unused inputs of the MC74HC02AD must be tied to a valid logic level - either VCC or GND - to prevent floating nodes that cause increased ICC, oscillation, or ESD susceptibility. Unused outputs may be left open (unconnected), as the device has no internal termination or bus-hold circuitry. Leaving inputs unconnected violates the absolute maximum ratings and risks unpredictable behavior or accelerated wear-out.
MC74HC02AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- NOR Gate
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- Features:
- -
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Max):
- 1 µA
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Input Logic Level - Low:
- 0.5V ~ 1.8V
- Input Logic Level - High:
- 1.5V ~ 4.2V
- Max Propagation Delay @ V, Max CL:
- 13ns @ 6V, 50pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
MC74HC02AD FAQ
1.How can I place an order for MC74HC02AD through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HC02AD 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 MC74HC02AD reliable?
The price and inventory of MC74HC02AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HC02AD is usually 5 days.
3.What payment methods are accepted for MC74HC02AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HC02AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HC02AD?
MC74HC02AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HC02AD 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 MC74HC02AD?
For technical support, including MC74HC02AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HC02AD requirements.
6.How does Aetrix verify that MC74HC02AD is sourced from the original manufacturer or authorized distributors?
All MC74HC02AD 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 MC74HC02AD meets industry standards.
7.What is the process for return or replacement of MC74HC02AD?
All MC74HC02AD units undergo pre-shipment inspection (PSI). If there is an issue with MC74HC02AD, 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 MC74HC02AD part is unused and in its original packaging.
Return procedure for MC74HC02AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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