74HCT109DB,112

Overview

The Nexperia 74HCT109DB,112 is a dual positive-edge-triggered JK flip-flop with set and reset inputs, housed in a 16-SSOP package. It operates within a supply voltage range of 4.5 V to 5.5 V. The device features a propagation delay of 17 ns, with output currents of -5.2 mA (high) and 5.2 mA (low). It supports an operating temperature range from -40 °C to +125 °C and complies with AEC-Q100 automotive qualification standards.

Feature Summary

• Dual positive-edge-triggered JK flip-flops with individual J and K inputs
• Asynchronous active LOW set and reset inputs independent of clock
• Schmitt-trigger action on clock input for slow rise/fall time tolerance
• TTL-compatible input levels with clamp diodes for over-voltage interfacing

Applications

• Automotive digital logic circuits requiring AEC-Q100 compliance
• Data storage and shift register applications
• Frequency division and counter circuits
• State machine implementations in industrial control systems

Procurement Notes

Verify the exact suffix '112' against official Nexperia documentation to confirm the specific tape-and-reel quantity and marking code. Ensure the SSOP-16 package variant matches your PCB footprint requirements. Confirm that the AEC-Q100 qualification status aligns with your specific automotive grade requirements before finalizing procurement orders.

Selection Notes

Select this component when TTL-level interface compatibility is required with CMOS logic families. The positive-edge triggering distinguishes it from negative-edge alternatives like the 74HC112. Verify that the 17 ns propagation delay meets your system timing constraints. Ensure the 4.5 V minimum supply voltage is compatible with your power rail design.

Part Context

This part belongs to the 74HCT series, which bridges TTL and CMOS technologies by providing TTL input thresholds while maintaining CMOS output characteristics. The 74HCT109 specifically provides two independent JK flip-flops, offering more functionality than single-flip-flop variants. It is designed for high-noise immunity and low power dissipation in standard 5 V logic environments.

Replacement Considerations

Publicly confirmed substitutes include the 74HCT109D,118 and 74HCT109D-Q100J. These parts share identical logical functions and pinouts but may differ in packaging (SOIC vs. SSOP) or specific automotive qualification suffixes. Always verify package dimensions and electrical parameters before substitution.