SN74HC109DRIn StockTexas Instruments
SN74HC109DR is a dual J-K flip-flop with preset/clear, positive-edge triggered, SOIC-16. From $0.09 at 1747+pcs. In stock, MOQ 1pc, ships globally.
- Manufacturer
- Texas Instruments
- Package
- SOIC-16
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- SN74HC109DR Datasheet PDF
- Category
- logic-gates
- Price
- From $0.0931(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Two independent J-K flip-flops in SOIC-16
- Positive-edge triggered with asynchronous preset and clear
- High-speed CMOS: max clock frequency 39MHz at 5V
- Wide supply: 2V to 6V for 3.3V and 5V systems
- Low power: 20µA quiescent current
Applications
Used in frequency dividers, counters, state machines, and sequential logic circuits. Common in clock distribution, shift registers, and digital control systems requiring edge-triggered storage elements.
Specifications
| Number of Flip-Flops | 2 |
| Type | J-K, positive-edge |
| Max Clock Frequency | 39MHz |
| Supply Voltage | 2-6V |
| Propagation Delay | 18ns |
| Quiescent Current | 20µA |
| Preset/Clear | Asynchronous, active-low |
| Logic Family | HC |
| Package | SOIC-16 |
Compliance & Regulatory
| RoHS Status | Compliant |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What type of flip-flop is SN74HC109?
SN74HC109 contains two J-K flip-flops triggered on the positive (rising) edge of the clock. Each flip-flop has J, K-not, clock, preset (active-low), and clear (active-low) inputs, plus Q and Q-not outputs.
What is the maximum clock frequency?
At 5V VCC, the maximum clock frequency is 39MHz. At 3.3V, maximum frequency drops to approximately 25MHz. These speeds are suitable for most glue logic and moderate-frequency counter/divider applications.
How do preset and clear work on SN74HC109?
Both preset (PRE) and clear (CLR) are active-low asynchronous inputs that override the clock. PRE forces Q=1 regardless of clock, CLR forces Q=0. Both must be HIGH during normal clocked operation. They should not both be LOW simultaneously.
Can SN74HC109 be used as a frequency divider?
Yes, connecting K-not to VCC (forcing K=0) and J to the Q-not output creates a toggle flip-flop that divides the input clock frequency by 2. Two flip-flops can divide by 4. This is one of the most common applications for J-K flip-flops.
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Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $0.2148 | $0.21 |
| 153+ | $0.1980 | $30.29 |
| 350+ | $0.1146 | $40.11 |
| 1747+ | $0.0931 | $162.65 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
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