Nexperia USA Inc. 74HCT112D-Q100J

Overview

74HCT112D-Q100 from Nexperia is a dual negative-edge-triggered JK flip-flop with asynchronous active-LOW set (nSD) and reset (nRD), complementary Q/nQ outputs per section, TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), and operation across -40 °C to +125 °C. It enables precise state control in synchronous digital systems such as automotive clock domain synchronization and industrial logic sequencers.

For engineers reviewing the 74HCT112D-Q100 datasheet, 74HCT112D-Q100 pinout, 74HCT112D-Q100 application, or 74HCT112D-Q100 equivalent, this page delivers verified functional behavior, SO16 package layout, propagation delay (tpd = 21–53 ns at VCC = 4.5–5.5 V), setup/hold timing (tsu = 16 ns, th = 0 ns), and automotive-grade reliability per AEC-Q100 Grade 0.

Technical Context

This device implements two independent edge-triggered JK flip-flops sharing no internal coupling-each with dedicated J, K, nCP, nSD, nRD, Q, and nQ terminals. Its Schmitt-trigger clock input tolerates slow rise/fall times, while clamp diodes permit safe interfacing to voltages exceeding VCC when used with current-limiting resistors.

Asynchronous nSD/nRD override clock action and force defined states regardless of nCP edge timing; simultaneous LOW on both causes undefined output. The JK function table supports toggle, set, reset, and hold modes based on stable J/K inputs one setup time before the HIGH-to-LOW nCP transition.

Key Specifications

Pinout & Package

74HCT112D-Q100 uses the SOT109-1 plastic small outline package (SO16), 16-pin, 3.9 mm body width, with gull-wing leads and pin 1 index marker. Thermal resistance θJA = 12.4 mW/K above 110 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT112DR and 74HC112D-Q100, the 74HCT112D-Q100 uniquely combines AEC-Q100 Grade 0 certification, TTL-level input compatibility, and 64 MHz toggle performance-making it the only drop-in solution for safety-critical automotive timing where pre-qualified reliability and 5 V system interoperability are mandatory.

Availability

74HCT112D-Q100 is available at Aetrix Electronics and suitable for automotive engine management, industrial PLC I/O modules, medical infusion pump controllers, and avionics data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT112D-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 focused on high-volume, high-reliability logic, analog, and discrete components, with leadership in automotive-qualified parts and energy-efficient technologies.

The 74HCT112D-Q100 belongs to Nexperia's AEC-Q100-qualified 74HCT logic family, engineered specifically for robust, pin-compatible replacement of legacy TTL in automotive and industrial control systems demanding guaranteed operation from −40 °C to +125 °C.

FAQ

What is the minimum setup time required for J and K inputs relative to the clock edge?

The 74HCT112D-Q100 requires J and K inputs to be stable for at least 16 ns before the HIGH-to-LOW clock transition at VCC = 4.5 V and Tamb = 25 °C. This value increases to 20 ns over the full −40 °C to +125 °C range. Violating this timing risks metastability or incorrect state transitions, especially in high-frequency toggle mode.

Can the 74HCT112D-Q100 operate reliably with a 3.3 V supply?

No. The 74HCT112D-Q100 is specified only for VCC = 4.5–5.5 V. At 3.3 V, input thresholds (VIH = 2.0 V min) remain valid, but output drive strength degrades significantly-VOH drops below 2.4 V at IO = −4 mA, risking logic-level violations in downstream 5 V CMOS loads. Use 74HC112D-Q100 instead for 3.3 V systems.

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

The Schmitt-trigger action on nCP provides hysteresis (typ. 0.4 V at VCC = 5 V), enabling reliable triggering even with slow-rising or noisy clock signals-common in cable-driven or electrically noisy automotive environments. This eliminates need for external RC filtering or dedicated clock conditioners in ECU and body-control modules.

Is simultaneous assertion of nSD and nRD allowed during normal operation?

No. Simultaneous LOW on both nSD and nRD forces undefined output states (Q/nQ may become metastable or oscillate), as documented in Table 3. Design must ensure mutually exclusive activation-typically via combinational logic that guarantees only one is asserted at a time, or using priority encoding in FPGA-based control layers.