Nexperia USA Inc. 74HC109PWJ

Overview

74HC109PWJ from Nexperia is a dual positive-edge-triggered JK flip-flop with asynchronous active-LOW set (SD) and reset (RD) inputs, complementary Q/Q̅ outputs per section, and TTL-compatible input thresholds for 74HCT variant operation. It operates across 2.0–6.0 V (HC) or 4.5–5.5 V (HCT), supports D-type configuration via J-K tie, and features Schmitt-trigger clock input for robust timing in noisy environments - used in synchronous logic control, state machines, and clock-domain interfacing.

For engineers reviewing the 74HC109PWJ datasheet, 74HC109PWJ pinout, 74HC109PWJ application, or 74HC109PWJ equivalent, this page delivers verified functional identity, validated TSSOP16 pin mapping, temperature-rated dynamic timing (e.g., 14 ns tpd at VCC = 6.0 V), real-world toggle/hold/set/reset behavior per mode table, and precise substitution guidance against industry-standard alternatives.

Technical Context

This device implements two independent edge-triggered JK flip-flops sharing no internal coupling - each with dedicated J, K, CP, SD, RD, Q, and Q̅ terminals. The asynchronous SD/RD inputs override clocked operation and function independently of CP transitions, enabling immediate state forcing without clock dependency.

Its Schmitt-trigger clock input accepts slow-rising signals (min. Δt/ΔV = 83 ns/V at VCC = 6.0 V), while J/K setup time (5 ns min. at VCC = 6.0 V) and hold time (0 ns) define strict input stability windows relative to the LOW-to-HIGH CP edge. Output drive strength is ±4.0 mA (VOH/VOL) at VCC = 4.5 V, supporting direct interface to 74-series TTL loads.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1), 16-pin, body width 4.4 mm, lead pitch 0.65 mm - optimized for high-density PCB layouts with thermal performance derating of 8.5 mW/K above 91 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC109PWR and MC74HC109ADTR2G, the 74HC109PWJ offers the lowest static current (4 μA), highest HBM ESD rating (>2000 V), and tightest propagation delay (14 ns), making it optimal for power-constrained, high-reliability, and high-speed synchronous logic.

Availability

74HC109PWJ is available at Aetrix Electronics and suitable for industrial PLC sequencing, digital audio clock domain crossing, test equipment pattern generation, and legacy bus interface logic requiring stable component supply across extended temperature ranges.

Supply support for 74HC109PWJ 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 focused on high-volume, high-reliability logic, analog, and MOSFET solutions - delivering energy-efficient, scalable components for industrial, automotive, and consumer markets.

The 74HC109PWJ belongs to Nexperia's 74HC logic family, engineered for low-power, wide-supply-voltage operation in space-constrained embedded control systems where deterministic timing and robust noise immunity are critical.

FAQ

Can 74HC109PWJ operate at 3.3 V supply?

Yes - the 74HC109PWJ is fully specified from 2.0 V to 6.0 V, including 3.3 V operation. At VCC = 3.3 V, VIH = 2.31 V (70% of VCC), VIL = 0.99 V (30%), VOH ≥ 3.1 V at IO = –4.0 mA, and VOL ≤ 0.22 V at IO = 4.0 mA, ensuring compatibility with 3.3 V microcontrollers and FPGAs without level translation.

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

The minimum pulse width for reliable asynchronous set or reset is 14 ns at VCC = 6.0 V, per tW specification in Table 7. This ensures the internal latch fully responds before the next clock edge or input change - critical for glitch-free initialization in high-frequency systems.

Does 74HC109PWJ support hot-swap or live-insertion?

No - while input clamp diodes allow safe overvoltage with current limiting, the device lacks hot-swap protection circuitry (e.g., slew-rate control, undervoltage lockout). Power sequencing must ensure VCC stabilizes before applying signals to SD/RD/CP/J/K pins to prevent undefined states or excessive ICC.

How does the Schmitt-trigger clock input improve system robustness?

The Schmitt-trigger on CP provides hysteresis (typ. 0.4 V at VCC = 5 V), rejecting noise spikes and slow-rising edges that could cause double-clocking. It guarantees exactly one state transition per monotonic CP rise, even with rise times up to 120 ns - essential in electrically noisy factory-floor or automotive environments.