Product Overview
HCF4023BE Triple 3-Input NAND Gate - 4000-Series CMOS Logic in a 14-Pin Plastic DIP
Condition
Unused new old stock (NOS). Sold each. Markings legible: HCF4023BE with the SGS logo.
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Product Overview
STMicroelectronics HCF4023BE: three independent NAND gates, each with three inputs, in a 14-pin plastic DIP. A 4000-series CMOS logic part.
Key Features
- Part number: HCF4023BE
- Function: triple 3-input NAND gate, three gates per package
- Logic: each output goes low only when all three of its inputs are high
- Family: 4000-series CMOS logic
- Package: 14-pin plastic DIP (PDIP-14), through-hole
Applications
- Detecting a three-line condition with one gate instead of two cascaded 2-input gates
- Building a set-reset latch from two cross-coupled gates
- Turning a spare gate into an inverter to save adding another chip
Frequently Asked Questions
What do I do with an input I do not need?
Tie it to the positive supply. A NAND input held high drops out of the logic, so the gate acts as a 2-input or 1-input NAND, and a CMOS input left floating can wander and draw extra current.
Can one of the gates work as an inverter?
Yes. Tie all three inputs together, or tie two of them high and drive the third.
How many gates does one package hold?
Three NAND gates with three inputs each, so a design that needs four or more of them takes a second chip.
Three inputs per gate is the whole point of the 4023: the condition where the door, the window and the timer all agree is one gate, not two. Sketch the logic first, then count the gates.
