Nexperia USA Inc. 74HCT109PW-Q100J

Overview

74HCT109PW-Q100 from Nexperia is an automotive-qualified dual positive-edge-triggered JK flip-flop with asynchronous set (SD) and reset (RD) inputs, complementary Q/Q̅ outputs per channel, TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), and operation over -40 °C to +125 °C. It supports D-type configuration via J–K tie, features Schmitt-trigger clock input for noise immunity, and delivers tpd = 20 ns (typ) at VCC = 4.5 V, CL = 50 pF - used in automotive body control modules for synchronous state retention and signal edge synchronization.

For engineers reviewing the 74HCT109PW-Q100 datasheet, 74HCT109PW-Q100 pinout, 74HCT109PW-Q100 application, or 74HCT109PW-Q100 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, TSSOP16 package thermal performance, asynchronous control timing (tPLH = 13 ns typ from SD to Q), and compatibility with 5 V TTL logic systems requiring deterministic edge-triggered storage.

Technical Context

This device implements two independent JK flip-flops sharing no internal coupling; each has dedicated J, K, CP, SD, RD, Q, and Q̅ terminals. The asynchronous SD and RD inputs override clocked operation and assert within 13 ns (typ) at VCC = 4.5 V, while the Schmitt-triggered CP input tolerates slow rise/fall times without metastability.

Functional modes include toggle (J=K=H), set (J=H,K=L), reset (J=L,K=H), hold (J=K=L), and undefined (SD=RD=L). Input setup time (tsu = 18 ns min) and hold time (th = 3 ns min) are specified relative to the LOW-to-HIGH CP transition, ensuring reliable sampling of J/K states before clock edge arrival.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1), 16-pin, 4.4 mm body width, 0.65 mm pitch, exposed pad not present, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC109PW-Q100, the subject part offers tighter input threshold alignment with TTL systems and guaranteed automotive temperature support, whereas SN74LV109APWREP trades qualification for higher frequency margin - making 74HCT109PW-Q100 optimal for cost-sensitive, safety-compliant 5 V automotive latching.

Availability

74HCT109PW-Q100 is available at Aetrix Electronics and suitable for automotive body electronics, engine management systems, and transmission control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT109PW-Q100 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, high-reliability logic, analog, and discrete components optimized for automotive, industrial, and consumer applications.

The 74HCT109PW-Q100 belongs to Nexperia's automotive-qualified logic portfolio, designed specifically for robust, pin-compatible replacement of legacy TTL and HC-series devices in safety-critical vehicle subsystems.

FAQ

What is the maximum clock frequency supported by the 74HCT109PW-Q100?

The 74HCT109PW-Q100 achieves fmax = 27 MHz (min) at VCC = 4.5 V and CL = 50 pF, with typical operation up to 55 MHz under ideal conditions. This limit derives from propagation delay (tpd = 20 ns typ) and setup/hold timing margins; exceeding it risks metastability or incorrect state capture, especially with asynchronous inputs active.

Can the 74HCT109PW-Q100 operate at 3.3 V supply?

No - the 74HCT109PW-Q100 is specified only for 4.5 V to 5.5 V operation. At 3.3 V, input thresholds (VIH = 2.0 V min) become unreliable, and output drive strength degrades below specification. For 3.3 V systems, use the pin-compatible 74LVC109 or 74AUP1G109 series instead.

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

The Schmitt-trigger on CP provides hysteresis (~0.3 V at VCC = 5 V), rejecting noise spikes and slow-rising edges that could cause double-clocking. This allows direct connection to RC-filtered microcontroller outputs or noisy harness-sourced clocks without external debouncing circuitry - reducing BOM count in automotive wiring harness interfaces.

Is there a recommended PCB layout practice for minimizing switching noise?

Place a 100 nF X7R ceramic capacitor between VCC (Pin 16) and GND (Pin 8) with trace length < 5 mm; route SD/RD traces away from clock and output lines; avoid routing Q/Q̅ traces parallel to sensitive analog paths. The TSSOP16 package's 0.65 mm pitch demands controlled-impedance routing only if operating >20 MHz in high-noise environments.