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onsemi MC74VHCT02AD
- Part No.:
- MC74VHCT02AD
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- -
- Datasheet:
-
MC74VHCT02AD.pdf
- Description:
- IC GATE NOR
- Quantity:
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Inventory:11,910
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Product details
Overview
MC74VHCT02AD from ON Semiconductor is a quad 2-input NOR gate IC in 14-lead SOIC (D suffix) package, operating at 4.5–5.5 V, delivering 3.6 ns typical propagation delay and TTL-compatible inputs (VIL = 0.8 V, VIH = 2.0 V), used for logic-level translation and noise-immune digital control in industrial interface circuits.
For engineers reviewing the MC74VHCT02AD datasheet, pinout, applications, or equivalent options, key selection criteria include its 5 V CMOS output swing, 7 V input tolerance, power-down input protection, balanced propagation delays, and SOIC-14 pin compatibility with standard logic families.
Technical Context
The MC74VHCT02AD implements four independent 2-input NOR gates using silicon-gate CMOS technology, with three-stage internal circuitry including buffered outputs to ensure high noise immunity and stable switching. Its input structures tolerate 0–7 V regardless of VCC, enabling robust 3.3 V ↔ 5 V level translation.
It features full 5 V CMOS output voltage swing (VOH ≥ 4.4 V, VOL ≤ 0.1 V at IOL = 50 μA), operates across −40 °C to +85 °C, and includes built-in protection against supply–input/output mismatch, hot insertion, and battery backup scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPD) | 3.6 ns typical at VCC = 5 V, CL = 15 pF - enables high-speed synchronous logic design up to ~100 MHz toggle rate |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures compatibility with regulated 5 V systems while tolerating ±10% rail variation |
| Input Voltage Tolerance | 0 V to 7 V - allows safe interfacing of 3 V controllers to 5 V buses without external clamping |
| Output Drive Strength | ±8 mA at VCC = 4.5 V - supports fan-out of ≥10 74VHCT loads or direct LED driving with current-limiting resistor |
| Quiescent ICC | 2 μA max at TA = 25 °C - enables ultra-low static power in always-on monitoring subsystems |
| ESD Rating | HBM > 2000 V - meets industrial handling requirements without additional board-level protection |
| Latchup Immunity | >300 mA - prevents destructive latchup during transient overvoltage events on I/O pins |
Pinout & Package
MC74VHCT02AD is housed in a 14-lead SOIC package (Case 751A−03, D suffix), 8.55–8.75 mm × 3.80–4.00 mm body, 1.27 mm lead pitch, with exposed pad not present and RoHS-compliant Pb-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | NOR Output (Y1–Y4) | Active-low open-drain–compatible CMOS outputs; each drives full 5 V swing with ±8 mA capability |
| 2, 3, 5, 6, 8, 9, 11, 12 | NOR Input (A1/B1–A4/B4) | TTL-compatible inputs (VIH = 2.0 V, VIL = 0.8 V); tolerate up to 7 V independent of VCC |
| 7 | GND | Ground reference for all logic and power domains; must be low-impedance connection to minimize ground bounce |
| 14 | VCC | Primary 4.5–5.5 V supply; requires local 0.1 μF ceramic decoupling within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| 3.6 ns propagation delay at 5 V | Enables timing-critical combinational logic in microcontroller peripheral decode paths without added clock skew |
| 7 V input overvoltage tolerance | Eliminates need for external level-shifting resistors when connecting mixed-voltage FPGA I/O or sensor interfaces |
| Power-down input protection | Prevents back-powering or damage when VCC = 0 V but input signals remain active (e.g., hot-swap modules) |
| ±8 mA output drive per gate | Supports direct driving of small-signal MOSFET gates or optocoupler LEDs without buffer stages |
| SOIC-14 pinout compatibility | Allows drop-in replacement of legacy 74LS02, 74HC02, or 74HCT02 in existing PCB layouts |
Applications
| Industrial PLC I/O Expansion | Microcontroller GPIO Logic Translation |
|---|---|
Use Scenario: Adding discrete 5 V digital inputs/outputs to a 3.3 V MCU-based PLC controller via optocoupled isolation. IC Role / Device Role / Timing Role: NOR gate configured as inverter or enable logic to translate MCU GPIO states into 5 V-compatible control signals for relay drivers. Use Value: Leverages 7 V input tolerance to accept 3.3 V MCU outputs directly, and delivers full 5 V swing to drive optocoupler LEDs without level shifters. |
Use Scenario: Interfacing a 3.3 V ARM Cortex-M0+ with legacy 5 V peripheral ICs (e.g., ADCs, DACs) requiring active-high chip select. IC Role / Device Role / Timing Role: NOR gate used as active-low to active-high translator (via A=B=CS̅) to generate clean 5 V CS signals synchronized to MCU clocks. Use Value: 3.6 ns tPD ensures setup/hold timing margins are preserved; TTL-compatible inputs eliminate need for pull-up resistors on MCU side. |
| Automotive Body Control Module | Test Equipment Signal Conditioning |
Use Scenario: Implementing fault-tolerant door lock actuator enable logic that disables output if either safety sensor or main command signal fails. IC Role / Device Role / Timing Role: Quad NOR used in wired-OR configuration to combine multiple safety interlock signals before enabling H-bridge driver. Use Value: Latchup immunity >300 mA and HBM ESD >2000 V meet automotive component stress test requirements (ISO 10605). |
Use Scenario: Cleaning noisy TTL-level trigger signals from legacy oscilloscopes or function generators before feeding to precision ADC sampling clocks. IC Role / Device Role / Timing Role: NOR gate deployed as Schmitt-trigger-like noise filter by tying one input to GND and using the other as signal input. Use Value: Buffered output stage provides low-VOLP (0.8 V max) and high noise margin, suppressing sub-5 ns glitches without external RC networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NOR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT02DR | Slightly higher ICC (4 μA max vs. 2 μA), identical pinout and AC specs; TI's version uses different process but same VHCT logic family | Same functional behavior in 5 V systems; minor quiescent current difference irrelevant in most powered applications | Preferred where TI supply chain alignment or dual-sourcing is required; no layout change needed |
| 74VHC02M | CMOS-only inputs (VIH = 3.5 V min), no TTL compatibility; lower ICC (1 μA), but incompatible with 3.3 V MCU outputs driving 5 V rails | Not suitable for 3.3 V → 5 V level translation; only valid in pure 5 V systems with clean logic thresholds | Select only when system uses exclusively 5 V logic sources and lowest possible static power is critical |
Compared with SN74HCT02DR and 74VHC02M, the MC74VHCT02AD uniquely combines TTL-compatible inputs, 7 V input tolerance, and <2 μA quiescent current-making it optimal for mixed-voltage industrial control where reliability and interface flexibility outweigh marginal cost differences.
Availability
MC74VHCT02AD is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, microcontroller GPIO logic translation, and test equipment signal conditioning requiring stable component supply and long-term manufacturability.
Supply support for MC74VHCT02AD 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
ON Semiconductor (now part of onsemi) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and logic solutions for automotive, industrial, and cloud infrastructure markets.
The MC74VHCT02AD belongs to the VHCT logic family, designed specifically for seamless 3.3 V/5 V mixed-signal interface applications with robust ESD/latchup performance and guaranteed timing across temperature.
FAQ
What is the maximum input voltage the MC74VHCT02AD can safely withstand?
The MC74VHCT02AD supports DC input voltages from −0.5 V to +7.0 V regardless of VCC level, enabling direct connection to 3.3 V, 5 V, or even 7 V signal sources without external clamping diodes or resistive dividers. This specification is validated across the full operating temperature range (−40 °C to +85 °C) and is critical for hot-swap and mixed-voltage system resilience.
Can the MC74VHCT02AD operate reliably at 3.3 V supply?
No - the MC74VHCT02AD is specified only for 4.5 V to 5.5 V operation per its Recommended Operating Conditions table. While inputs tolerate 3.3 V signals, VCC must be ≥4.5 V to guarantee VOH ≥4.4 V and VOL ≤0.1 V. For true 3.3 V operation, consider the MC74VHC02AD instead.
Does the MC74VHCT02AD require external pull-up or pull-down resistors on unused inputs?
Yes - per the datasheet, all unused inputs must be tied to a defined logic level (GND or VCC) to prevent floating nodes that cause excessive ICC, oscillation, or increased EMI. Leaving inputs unconnected risks unpredictable output states and elevated power consumption due to internal input stage metastability.
Is the MC74VHCT02AD pin-compatible with older 74LS02 or 74HC02 devices?
Yes - the MC74VHCT02AD uses the industry-standard 14-pin SOIC footprint and identical pin assignment (Y1–Y4, A1/B1–A4/B4, GND, VCC) as 74LS02, 74HC02, and 74HCT02. This allows direct PCB replacement without layout modification, provided the system operates within the 4.5–5.5 V supply window.
What is the thermal derating behavior of the MC74VHCT02AD in SOIC package?
In SOIC packages (D suffix), the MC74VHCT02AD has a thermal derating factor of −7 mW/°C above 65 °C ambient. Its maximum power dissipation drops linearly from 500 mW at 65 °C to 145 mW at 125 °C, requiring careful thermal design in enclosed or high-temperature environments to avoid exceeding junction temperature limits.
MC74VHCT02AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Circuits:
- -
- Number of Inputs:
- -
- Features:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Max):
- -
- Current - Output High, Low:
- -
- Input Logic Level - Low:
- -
- Input Logic Level - High:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MC74VHCT02AD FAQ
1.How can I place an order for MC74VHCT02AD through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74VHCT02AD 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 MC74VHCT02AD reliable?
The price and inventory of MC74VHCT02AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74VHCT02AD is usually 5 days.
3.What payment methods are accepted for MC74VHCT02AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74VHCT02AD transactions.
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4.How is shipping managed for MC74VHCT02AD?
MC74VHCT02AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74VHCT02AD 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 MC74VHCT02AD?
For technical support, including MC74VHCT02AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74VHCT02AD requirements.
6.How does Aetrix verify that MC74VHCT02AD is sourced from the original manufacturer or authorized distributors?
All MC74VHCT02AD 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 MC74VHCT02AD meets industry standards.
7.What is the process for return or replacement of MC74VHCT02AD?
All MC74VHCT02AD units undergo pre-shipment inspection (PSI). If there is an issue with MC74VHCT02AD, 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 MC74VHCT02AD part is unused and in its original packaging.
Return procedure for MC74VHCT02AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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