Nexperia USA Inc. 74HCT173D,653

Overview

74HCT173D,653 from Nexperia is a quad positive-edge-triggered D-type flip-flop with 3-state outputs, asynchronous master reset (active HIGH), dual input enable (E1/E2, active LOW), and dual output enable (OE1/OE2, active LOW). It operates at 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, and delivers 20 ns typical propagation delay (CP to Qn) at VCC = 4.5 V, CL = 50 pF - used in synchronous data latching and bus interface logic in industrial control modules.

For engineers reviewing the 74HCT173D,653 datasheet, 74HCT173D,653 pinout, 74HCT173D,653 application, or 74HCT173D,653 equivalent, this device is selected for TTL-level compatible edge-triggered register functions requiring independent input gating, 3-state bus driving, and robust hold/reset behavior under wide-temperature industrial operation.

Technical Context

The 74HCT173D,653 implements four independent D-type flip-flops sharing a common clock (CP) and asynchronous master reset (MR), with separate input enable (E1/E2) and output enable (OE1/OE2) controls per pair of outputs. Its TTL-compatible inputs accept VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 4.5–5.5 V, ensuring interoperability with legacy 5 V logic families.

Each flip-flop samples Dn on the LOW-to-HIGH CP transition when both E1 and E2 are LOW; a HIGH on either E1 or E2 forces outputs to retain prior state regardless of clock or data. OE1/OE2 independently place Q0–Q3 into high-impedance OFF-state without affecting internal register state.

Key Specifications

Pinout & Package

74HCT173D,653 is housed in a plastic small outline package (SO16, SOT109-1) with 16 leads and 3.9 mm body width, optimized for surface-mount assembly and thermal performance up to 125 °C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT173D,653, the TSSOP variant offers higher board density and better thermal management, while the PDIP version provides mechanical robustness and ease of manual handling - choice depends on assembly method, thermal budget, and layout constraints.

Availability

74HCT173D,653 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface logic, motor control feedback registration, and test equipment pattern generation requiring stable component supply across extended temperature ranges.

Supply support for 74HCT173D,653 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 logic, analog, and discrete components with focus on efficiency, reliability, and sustainability.

The 74HCT173D,653 belongs to Nexperia's 74HCT logic family - engineered for TTL-compatible interfacing in industrial, automotive (non-safety), and consumer systems demanding robust noise immunity and wide-temperature operation.

FAQ

What is the minimum recommended VCC for reliable 74HCT173D,653 operation?

The 74HCT173D,653 requires a minimum VCC of 4.5 V per its recommended operating conditions. Operation below 4.5 V risks violation of TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), leading to undefined logic states or increased static current. The absolute maximum rating allows up to 5.5 V, but sustained use at 5.5 V increases power dissipation and thermal stress without functional benefit.

Can OE1 and OE2 be tied together for unified 3-state control?

Yes - OE1 and OE2 may be externally wired together and driven by a single signal to simultaneously tri-state all four outputs (Q0–Q3). This configuration is electrically valid and commonly used in bus applications where full-port disable is required. No internal conflict arises, as the outputs respond independently to their respective OE pin state per the function table.

How does the master reset (MR) interact with input enables (E1/E2)?

MR is fully asynchronous and overrides all other controls: when MR is HIGH, all Qn outputs force LOW immediately, regardless of CP, E1, E2, or OE states. Input enables remain functional during MR assertion - Dn inputs continue to be sampled on CP edges, but their values are not latched due to the forced-clear condition. MR takes precedence in the logic hierarchy.

Is the 74HCT173D,653 suitable for 3.3 V system interfacing?

No - the 74HCT173D,653 is not rated for 3.3 V operation. Its recommended VCC range is strictly 4.5 V to 5.5 V, and TTL-compatible inputs require VIH ≥ 2.0 V, which is incompatible with 3.3 V logic high levels (typically ~3.3 V). For 3.3 V systems, use the 74LVC173 or 74ALVC173, which are designed for 3.3 V supply and have appropriate input thresholds.