Nexperia USA Inc. 74AHCT74D,112

Overview

74AHCT74D,112 from Nexperia is a dual positive-edge-triggered D-type flip-flop with asynchronous set (active LOW) and reset (active LOW), complementary Q/Q outputs, TTL-level input compatibility, and 14-pin SO14 package. It operates from 4.5 V to 5.5 V across –40 °C to +125 °C and delivers 115 MHz max frequency at 5 V/50 pF load. Used in synchronous logic control, clock domain interfacing, and data latching in industrial microcontroller peripherals.

For engineers reviewing the 74AHCT74D,112 datasheet, 74AHCT74D,112 pinout, 74AHCT74D,112 application, or 74AHCT74D,112 equivalent, key selection criteria include TTL-compatible input thresholds, propagation delay ≤9.5 ns (VCC = 5 V, CL = 15 pF), setup/hold times of 5.0 ns / 0 ns, Schmitt-trigger clock input tolerance, and SO14 thermal performance up to +125 °C.

Technical Context

This device implements two independent edge-triggered D flip-flops sharing no internal coupling-each with dedicated D, CP, SD, RD, Q, and Q̅ terminals. The asynchronous SD and RD inputs override clock action and force outputs immediately, while the Schmitt-triggered CP input accepts slow-rising signals without metastability risk.

Logic behavior follows standard D-type operation: on LOW-to-HIGH CP transition, Qn+1 = Dn if SD = RD = HIGH; SD = LOW forces Q = HIGH regardless of CP or D; RD = LOW forces Q = LOW. Input voltage thresholds are fixed at VIH = 2.0 V (min), VIL = 0.8 V (max) for TTL compatibility, ensuring robust interfacing with legacy LSTTL systems.

Key Specifications

Pinout & Package

74AHCT74D,112 uses the SOT108-1 (SO14) plastic small outline package: 14-lead, 3.9 mm body width, 1.27 mm lead pitch, JEDEC MS-012 compliant, with gull-wing leads and pin 1 index notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHCT74DR and 74LVC74AD,118, the 74AHCT74D,112 uniquely balances TTL compatibility, 125 °C operation, and sub-10 ns propagation in a widely available SO14 package-making it optimal for industrial retrofits and automotive modules where legacy interface integrity and thermal resilience are non-negotiable.

Availability

74AHCT74D,112 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and test equipment digital pattern generation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHCT74D,112 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, reliable discrete, logic, and MOSFET solutions with focus on efficiency, reliability, and sustainability.

The 74AHCT74D,112 belongs to Nexperia's industry-standard 74-series logic family, engineered for seamless interoperability with legacy TTL systems while meeting modern industrial and automotive environmental and reliability requirements.

FAQ

What is the minimum recommended decoupling capacitance for 74AHCT74D,112?

A 100 nF X7R ceramic capacitor placed within 1 cm of VCC (pin 14) and GND (pin 7) is mandatory. For systems with high di/dt switching (e.g., >50 MHz clocking), add a 10 nF capacitor in parallel to suppress high-frequency noise. Layout must minimize loop area between capacitor pads and IC pins to maintain effective bypassing.

Can 74AHCT74D,112 operate reliably at 3.3 V supply?

No. The 74AHCT74D,112 is specified only for 4.5 V to 5.5 V operation. At 3.3 V, VIH (2.0 V min) exceeds 60% of VCC, violating input threshold ratios and risking unreliable logic recognition. Use 74AHC74D or 74LVC74AD instead for 3.3 V systems.

How does the Schmitt-trigger clock input improve noise immunity?

The Schmitt-trigger on CP provides ≥0.5 V hysteresis at 5 V, meaning the rising threshold is ~2.3 V and falling threshold is ~1.8 V. This prevents multiple triggering from slow or noisy clock edges, eliminating the need for external RC filters and reducing susceptibility to EMI on PCB traces longer than 5 cm.

Is pin 1 index location consistent across SO14, TSSOP14, and QFN variants?

Yes. All packages (SOT108-1/SO14, SOT402-1/TSSOP14, SOT762-1/DHVQFN14, SOT8014-1/DHXQFN14) follow JEDEC-standard pin 1 indexing: notch or dot adjacent to pin 1, with pins numbered counterclockwise. Pin functions and ordering are identical across packages-only physical form factor and thermal characteristics differ.