NXP Semiconductors 74HCT112N,652

Overview

74HCT112N,652 from Nexperia is a dual negative-edge-triggered JK flip-flop with asynchronous active-LOW set (nSD) and reset (nRD), TTL-compatible input levels, 16-pin DIP package, and operation from -40 °C to +125 °C. It delivers predictable state control in clock-synchronized logic systems requiring toggle, load, or hold functionality - used in industrial control sequencers and digital instrumentation timing circuits.

For engineers reviewing the 74HCT112N,652 datasheet, 74HCT112N,652 pinout, 74HCT112N,652 application, or 74HCT112N,652 equivalent, key selection criteria include TTL-level input compatibility, guaranteed negative-edge triggering, asynchronous reset/set independence from clock, propagation delay ≤53 ns at 4.5 V, and SO16/TSSOP16 package alternatives for layout flexibility.

Technical Context

This device implements two independent JK flip-flops sharing no internal coupling - each with dedicated J, K, nCP, nSD, nRD, nQ, and nQ terminals. The Schmitt-trigger clock input enables robust operation with slow-rising/falling edges, while clamp diodes on all inputs permit safe interfacing to voltages exceeding VCC when current-limiting resistors are used.

Functionally, it supports six defined operating modes per flip-flop: asynchronous set (nSD=LOW), asynchronous reset (nRD=LOW), toggle (J=K=HIGH, clock ↓), load-0 (J=LOW/K=HIGH), load-1 (J=HIGH/K=LOW), and hold (J=K=LOW). Output states become unpredictable only if nSD and nRD transition LOW→HIGH simultaneously.

Key Specifications

Pinout & Package

74HCT112N,652 uses a 16-pin plastic dual in-line package (DIP), designated as "N" in Nexperia's ordering nomenclature. This through-hole package features 0.3-inch body width, 0.1-inch lead pitch, and tin-plated leads compatible with wave and selective soldering processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT112N,652, the SO16 and TSSOP variants offer identical functionality and performance but differ in mechanical implementation: DIP supports prototyping and through-hole assembly, while SO16/TSSOP enable miniaturization and automated manufacturing - selection hinges on assembly method and board real estate constraints.

Availability

74HCT112N,652 is available at Aetrix Electronics and suitable for industrial control sequencers, digital instrumentation timing circuits, test equipment pattern generators, and legacy system logic reconstruction requiring stable component supply across extended temperature ranges.

Supply support for 74HCT112N,652 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 essential efficiency technologies, delivering high-performance logic, analog, and discrete components with rigorous quality and reliability standards.

The 74HCT112N,652 belongs to Nexperia's 74HCT logic family - engineered for TTL-compatible interfacing in industrial, automotive (non-safety), and computing applications where robustness, wide temperature operation, and low power consumption are prioritized.

FAQ

What is the maximum clock frequency supported by the 74HCT112N,652?

The 74HCT112N,652 supports a maximum clock frequency of 20 MHz at VCC = 4.5 V and Tamb = 25 °C, with guaranteed operation up to 16 MHz across the full -40 °C to +125 °C range. This is derived from the minimum pulse width (tW) specification of 20 ns for nCP HIGH/LOW and confirmed by fmax test data showing 24 MHz minimum at 4.5 V over temperature.

Does the 74HCT112N,652 have Schmitt-trigger inputs on all pins or only the clock?

Only the nCP (clock) input of the 74HCT112N,652 features Schmitt-trigger action - explicitly stated in the General Description section of the datasheet. All other inputs (J, K, nSD, nRD) use standard CMOS input buffers without hysteresis, meaning they require clean, monotonic transitions to avoid metastability.

Can the 74HCT112N,652 operate reliably at 3.3 V supply voltage?

No - the 74HCT112N,652 is not specified for 3.3 V operation. Its recommended VCC range is strictly 4.5 V to 5.5 V, with VIH/VIL thresholds defined only within that band. At 3.3 V, input recognition becomes unreliable (e.g., VIH min = 2.0 V becomes marginal), and DC/AC parameters are unguaranteed per datasheet Section 8.

What happens if both nSD and nRD are pulled LOW simultaneously on the 74HCT112N,652?

When nSD and nRD are both LOW, the 74HCT112N,652 forces both nQ and nQ outputs HIGH per the Function Selection table ('Undetermined' mode). However, releasing both lines to HIGH simultaneously results in an undefined final state - the datasheet explicitly warns that output states are unpredictable in this condition, requiring external synchronization or reset sequencing.

Is the 74HCT112N,652 RoHS compliant and halogen-free?

Yes - the 74HCT112N,652 meets RoHS Directive 2011/65/EU and is certified halogen-free per Nexperia's material declarations. The "N" package suffix denotes a leaded DIP variant compliant with exemption 7a (lead in high-melting-temperature type solders), and full compliance documentation is available via Nexperia's product portal.