SN74HC109 Dual JK Flip-Flop with Preset and Clear (Logic IC)
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Prices updated: 14 Oct 2026
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About this product
The SN74HC109 is a 74HC-series logic IC containing two positive-edge-triggered JK flip-flops, each with preset and clear inputs. It is used in counters, registers and state machines, and in general digital logic and learning projects.
Specifications
- Logic family
- 74HC (CMOS)
- Circuit
- Dual JK flip-flop
- Trigger
- Positive edge
- Inputs
- Preset and Clear (active low)
- Supply voltage
- 2 V to 6 V
Frequently asked questions
Can it run from a 3.3V supply?
Yes. The 2 V to 6 V supply range covers both 3.3 V and 5 V operation. Keep the input signals within the supply levels.
How should I handle unused Preset and Clear pins?
Preset and Clear are active low, so unused inputs should be held inactive by tying them to the supply through a pull-up resistor. This prevents unintended resets or presets.
