Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Logic Function | 4 independent 2-input NOR gates |
| Supply | 2 V to 6 V |
| Logic Family | HC CMOS |
| Fanout | Up to 10 LSTTL loads stated family feature |
| Power | Significant static-power reduction versus LSTTL architecture |
| Use | S-R latches, alarm/tamper logic, general Boolean glue logic |
| Package | SOIC (D), 14 pins |
| Exact Packing | 2500-piece large tape and reel; −40°C to +85°C; marking HC02 |
Product Overview
SN74HC02DR contains four independent NOR gates in one SOIC-14. NOR is a universal logic primitive and is particularly common in cross-coupled S-R latches and active-high alarm combination logic.
This quad device is more efficient than scattering four single gates when several NOR functions are clustered in one schematic area. Conversely, a board needing only one function may save routing/area with a single-gate device.
HC operation extends to 6 V and keeps low static current compared with legacy TTL. Exact input thresholds remain HC-CMOS values and must be checked when interfacing older TTL outputs at nonstandard rails.
For related devices, see HKEQGOO’s Gates and Inverters category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | SN74HC02DR |
| Logic Function | 4 independent 2-input NOR gates |
| Supply | 2 V to 6 V |
| Logic Family | HC CMOS |
| Fanout | Up to 10 LSTTL loads stated family feature |
| Power | Significant static-power reduction versus LSTTL architecture |
| Use | S-R latches, alarm/tamper logic, general Boolean glue logic |
| Package | SOIC (D), 14 pins |
| Exact Packing | 2500-piece large tape and reel; −40°C to +85°C; marking HC02 |
| Manufacturer Status | Active / Production |
| Part Marking | HC02 |
Functional Highlights
Four NOR gates can implement compact latch/control networks
Cross-coupled pairs naturally form simple hardware state storage while remaining gates handle qualification.
HC family supports a wide 2–6 V rail
The same logic function can be used across common 3.3 V and 5 V CMOS systems when thresholds/fanout are compatible.
Design Considerations
- Do not leave any unused inputs floating.
- Check HC VIH/VIL against the driving logic family.
- Use local decoupling because multiple gates may switch simultaneously in one package.
Product Status and Exact Order Code
Texas Instruments lists SN74HC02DR as Active / Production; SOIC (D), 14 pins; 2500-piece large tape and reel; −40°C to +85°C; marking HC02.
Related Engineering Resources
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