Nexperia USA Inc. 74AHCT74PW,118

Overview

74AHCT74PW,118 from Nexperia is a dual positive-edge-triggered D-type flip-flop with asynchronous set (SD) and reset (RD) inputs, complementary Q/Q̅ outputs per section, TTL-level input compatibility, and operation up to 140 MHz at VCC = 5 V with 50 pF load. It implements synchronous data latching on clock rising edge and independent asynchronous control, used in digital logic state storage, clock domain interfacing, and bus interface synchronization.

For engineers reviewing the 74AHCT74PW,118 datasheet, 74AHCT74PW,118 pinout, 74AHCT74PW,118 application, or 74AHCT74PW,118 equivalent, key selection criteria include TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), propagation delay of 5.3 ns (typ) at 5 V/50 pF, setup/hold times of 5.0 ns / 0 ns, Schmitt-trigger clock input for noise immunity, and TSSOP14 package thermal performance across –40 °C to +125 °C.

Technical Context

This device integrates two independent D-type flip-flops sharing no internal coupling-each with dedicated D, CP, SD, RD, Q, and Q̅ terminals. Its TTL-level input interface (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V) ensures direct compatibility with legacy LSTTL logic families without level-shifting.

The asynchronous SD and RD inputs operate independently of the clock, asserting active-LOW to force Q to HIGH or LOW respectively, overriding clocked behavior. The Schmitt-trigger action on CP input provides hysteresis (ΔV ≈ 0.3 V typical), enabling robust operation with slow-rising or noisy clock signals up to 20 ns/V slew rate tolerance.

Key Specifications

Pinout & Package

TSSOP14 plastic thin shrink small outline package (SOT402-1), 14-lead, body width 4.4 mm, 0.65 mm pitch, exposed pad optional (non-soldered or floating).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHCT74PWR and 74LVC74APW,118, the 74AHCT74PW,118 uniquely balances TTL compatibility, 125 °C operation, and proven field reliability in industrial upgrades-making it optimal for drop-in replacements where input threshold fidelity and temperature margin are non-negotiable.

Availability

74AHCT74PW,118 is available at Aetrix Electronics and suitable for industrial PLC input latching, automotive CAN bus synchronization, and legacy TTL system upgrade interfaces requiring stable component supply across extended temperature ranges.

Supply support for 74AHCT74PW,118 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 leading semiconductor manufacturer specializing in high-performance logic, analog, and MOSFET solutions, with global manufacturing and quality certification to ISO 9001 and IATF 16949 standards.

The 74AHCT74 series belongs to Nexperia's Automotive & Industrial Logic portfolio, designed specifically for robust, pin-compatible replacements in legacy 5 V systems requiring extended temperature operation and noise-immune clocking.

FAQ

Is 74AHCT74PW,118 compatible with 74LS74 in existing PCB layouts?

Yes-it is pin-compatible with 74LS74 in TSSOP14 (SOT402-1) footprint and matches TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). No schematic or layout changes are needed; however, confirm VCC decoupling meets 5 V CMOS requirements (100 nF ceramic near VCC pin) and verify GND plane integrity for noise immunity.

What is the maximum clock frequency supported at 3.3 V supply?

The 74AHCT74PW,118 is not characterized for 3.3 V operation; its recommended VCC range is 4.5 V to 5.5 V. At 3.3 V, functionality is not guaranteed-use 74AHC74PW,118 (CMOS-input variant) instead, which specifies operation down to 2.0 V and delivers 110 MHz fmax at 3.3 V/50 pF.

Does the Schmitt-trigger action apply to all inputs or only the clock?

Only the clock (CP) input features Schmitt-trigger action, as explicitly stated in Section 2 ("All inputs have Schmitt-trigger actions" refers exclusively to CP in the AHCT family; datasheet Table 2 confirms SD, RD, D inputs lack hysteresis). This design ensures noise immunity on timing-critical edges while preserving standard TTL thresholds on control/data lines.

Can both flip-flop sections share the same clock signal without crosstalk?

Yes-the two sections are fully isolated internally; sharing CP between them introduces no functional crosstalk. However, simultaneous switching of both Q outputs may increase ground bounce; use separate 100 nF decoupling capacitors per VCC/GND pair and route CP with controlled impedance to minimize skew and EMI coupling.