SN74LS109AN Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
Texas Instruments SN74LS109AN is a dual J-K positive-edge-triggered flip-flop with set and reset inputs, operating at 4.75–5.25V with 25MHz max frequency in a 16-pin PDIP package. From $0.85, in stock, worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- SN74LS109AN Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.8452(MOQ 50)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74LS109AN?
- Dual J-K positive-edge-triggered flip-flop with inverted K input for versatile logic design
- Operates at up to 25 MHz max frequency with 4.75–5.25V supply voltage range
- 16-pin PDIP package with set and reset inputs for synchronous and asynchronous control
- RoHS compliant (Pb-free) with 15 pF load capacitance and 8 mA output low current
What is SN74LS109AN used for?
The SN74LS109AN is widely used in digital sequential logic circuits, including counters, shift registers, and state machines in industrial control and embedded systems. Its dual J-K flip-flop structure makes it ideal for frequency division, data storage, and synchronization tasks in microprocessor-based designs. The device is also commonly employed in legacy TTL-compatible systems requiring reliable clock-driven storage elements.
What are the specifications of SN74LS109AN?
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | INVERTED K INPUT |
| Family | LS |
| JESD-30 Code | R-PDIP-T16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 15pF |
| Logic IC Type | J-KBAR FLIP-FLOP |
| Max Frequency@Nom-Sup | 25000000Hz |
| Max I(ol) | 0.008A |
| Number of Bits | 2 |
| Number of Functions | 2 |
| Output Polarity | COMPLEMENTARY |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 15mA |
| Prop. Delay@Nom-Sup | 35ns |
| Propagation Delay (tpd) | 40ns |
| Qualification Status | Not Qualified |
| Schmitt Trigger | NO |
| Supply Voltage-Max (Vsup) | 5.25V |
| Supply Voltage-Min (Vsup) | 4.75V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 30MHz |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Malaysia, Mexico |
Where can I find the SN74LS109AN datasheet?
SN74LS109AN Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74LS109AN?
Compatible alternatives and drop-in replacements for SN74LS109AN:
J-Kbar Flip-Flop, LS Series, 2-Func, Positive Edge Triggered, 2-Bit, Complementary Output, TTL
J-Kbar Flip-Flop, LS Series, 2-Func, Positive Edge Triggered, 2-Bit, Complementary Output, TTL, PDSO16
J-Kbar Flip-Flop, LS Series, 2-Func, Positive Edge Triggered, 2-Bit, Complementary Output, TTL, PDIP16
Frequently Asked Questions
What is the maximum operating frequency of the SN74LS109AN?
The SN74LS109AN supports a maximum operating frequency of 25 MHz at nominal supply voltage (5V). This makes it suitable for medium-speed digital logic applications such as counters and shift registers in embedded and industrial systems.
What package does the SN74LS109AN come in and what are its pin dimensions?
The SN74LS109AN comes in a 16-pin PDIP (Plastic Dual In-Line Package) through-hole package, which is compatible with standard breadboards and PCB through-hole footprints. The DIP package offers easy manual soldering and is widely used in prototyping and legacy system designs.
What are the key differences between the SN74LS109AN and a standard J-K flip-flop?
Unlike a standard J-K flip-flop, the SN74LS109AN features an inverted K input (K-bar), meaning the K pin is active-low. This simplifies certain logic configurations and allows the device to function as a D-type flip-flop by tying J and K-bar together. It also includes asynchronous preset and clear inputs for direct state control.
Is the SN74LS109AN RoHS compliant?
Yes, the SN74LS109AN is RoHS compliant and Pb-free (JESD-609 Code: e4), meeting environmental regulations for restriction of hazardous substances. It carries a YTEOL rating of 15 years for long-term supply availability.
What are typical applications for the SN74LS109AN?
The SN74LS109AN is commonly used in digital counters, frequency dividers, shift registers, and synchronous state machines. It is well-suited for TTL-level logic systems in industrial control, telecommunications, and legacy microprocessor-based designs requiring reliable edge-triggered storage.
Related Guides
CSD87313DMS Synchronous Buck Power Stage Design Guide
Design a compact CSD87313DMS synchronous buck stage with practical guidance for loss, gate drive, PCB layout, EMI, thermal validation, and sourcing.
Aug 6, 2026
STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection
Choose STEF05SGR for 5 V overcurrent protection by checking current-limit margin, inrush, thermal loss, fault response, and sourcing.
Aug 6, 2026
C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC
Select C0402C103K3RACTU by voltage margin, X7R behavior, tolerance, 0402 assembly risk, and qualified alternatives.
Aug 4, 2026
STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security
Choose STM32H753VIT6 by evaluating memory architecture, LQFP-100 pin fit, connectivity, security, power, and sourcing tradeoffs.
Aug 4, 2026
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.
More from Texas Instruments
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 50+ | $1.8000 | $90.00 |
| 100+ | $1.6900 | $169.00 |
| 194+ | $1.5500 | $300.70 |
| 1000+ | $0.8452 | $845.20 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit