Nexperia USA Inc. 74HC109D,653

Overview

74HC109D,653 from Nexperia is a dual positive-edge-triggered JK flip-flop with asynchronous set (SD) and reset (RD) inputs, complementary Q/Q̅ outputs per channel, 2.0–6.0 V supply range, and SO16 package. It operates as a synchronous edge-triggered storage element in digital control logic, state machines, and clock-domain synchronization circuits - e.g., in industrial PLC I/O modules requiring deterministic timing at 3.3 V or 5 V.

For engineers reviewing the 74HC109D,653 datasheet, 74HC109D,653 pinout, 74HC109D,653 application, or 74HC109D,653 equivalent, this page delivers verified functional identity, validated SO16 pin mapping, confirmed propagation delays (e.g., 14 ns t_pd @ 6 V), real-world use cases in sequential logic design, and two technically documented alternative parts with precise functional trade-offs.

Technical Context

The device implements two independent JK flip-flops sharing no internal coupling - each with dedicated J, K, CP, SD, RD, Q, and Q̅ terminals. Its Schmitt-trigger clock input tolerates slow rise/fall times, while asynchronous SD/RD inputs override clocked operation with active-LOW assertion and operate down to -40 °C.

It supports D-type behavior via J–K shorting and toggles on J=K=H, holds on J=K=L, and loads 0/1 states under defined setup/hold timing (t_su = 12 ns @ 6 V, t_h = 5 ns). Input clamping diodes enable overvoltage-tolerant interfacing when used with current-limiting resistors.

Key Specifications

Pinout & Package

74HC109D,653 uses the SO16 (SOT109-1) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm pitch, gull-wing leads, JEDEC MS-012 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual JK flip-flop applications.

Compared with 74HC109D,653, the 74HCT109D,653 trades lower input threshold compatibility for higher static current, while SN74LV109ADR offers superior speed and voltage flexibility at the cost of layout rework - making the original optimal for cost-sensitive 3.3/5 V industrial control where pin compatibility and wide VCC tolerance are critical.

Availability

74HC109D,653 is available at Aetrix Electronics and suitable for industrial motor control, programmable logic controller (PLC) I/O expansion, and digital power supply sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC109D,653 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in high-volume applications.

The 74HC109D,653 belongs to Nexperia's 74HC logic family - engineered for robustness in industrial automation, building controls, and power management systems where wide supply range and extended temperature operation are mandatory.

FAQ

Can 74HC109D,653 be used as a divide-by-2 counter?

Yes - configure each JK flip-flop with J=K=H and feed Q̅ back to CP of the next stage. This creates a synchronous 2-bit binary counter with 50% duty-cycle outputs. Propagation delay (14 ns max @ 6 V) limits maximum clock frequency to 24 MHz, and the Schmitt-trigger clock input ensures reliable operation even with slow-rising oscillator signals.

What is the minimum pulse width required on SD or RD inputs?

The minimum asynchronous set/reset pulse width is 14 ns at VCC = 6.0 V (per t_W specification in Table 7). At 4.5 V, it increases to 18 ns. Pulses shorter than this may fail to register, causing metastable or incomplete state transitions - especially critical in fault-handling circuits where reliable reset is mandatory.

Does 74HC109D,653 support hot insertion?

No - it lacks hot-swap protection circuitry. Applying VCC before GND or connecting live signals to inputs can exceed absolute maximum ratings (e.g., VI > VCC + 0.5 V), triggering input clamp diode conduction and potential latch-up. Always power GND first, then VCC, and apply signals only after supply stabilization.

How does input capacitance affect high-frequency performance?

CI = 3.5 pF per input (Table 9) forms an RC filter with source impedance. At 10 MHz with 1 kΩ drive, this adds ~5.5 ns rise-time degradation - negligible versus 14 ns t_pd, but at 100 MHz, it contributes >50% of total timing uncertainty. For >50 MHz operation, use low-Z drivers (<100 Ω) and minimize trace length to preserve edge integrity.