Nexperia USA Inc. 74HCT173D,652

Overview

74HCT173D,652 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 (VCC = 4.5 V, CL = 50 pF) in SO16 package - used for synchronous data latching and bus interface control in industrial logic systems.

For engineers reviewing the 74HCT173D,652 datasheet, 74HCT173D,652 pinout, 74HCT173D,652 application, or 74HCT173D,652 equivalent, this device is selected for TTL-level-compatible edge-triggered register functions requiring hold mode, high-impedance bus sharing, and robust ESD protection (HBM >2000 V).

Technical Context

The 74HCT173D,652 implements four independent D-type latches synchronized to the LOW-to-HIGH clock transition, with asynchronous MR overriding all register states. Its dual input enables (E1/E2) gate data loading only when both are LOW; any HIGH forces output retention regardless of CP or Dn inputs.

Output enables (OE1/OE2) operate independently of internal register state: either HIGH places Q0–Q3 into high-impedance OFF-state without altering stored values. Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

74HCT173D,652 is housed in a plastic small outline package (SO16, SOT109-1) with 16 leads and 3.9 mm body width. Pin 1 is marked by a notch or dot; leads are gull-wing, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad D-type flip-flop with 3-state output applications.

Compared with 74HC173D,652, the 74HCT173D,652 offers guaranteed TTL-level compatibility for legacy system integration, while SN74HCT173N provides identical logic functionality in through-hole form - enabling direct replacement in service or development environments where SMT rework is impractical.

Availability

74HCT173D,652 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, digital test equipment bus interface, automated meter reading controllers, and legacy system logic upgrades requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT173D,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 high-volume, high-reliability logic, discrete, and MOSFET solutions - serving automotive, industrial, and consumer markets with scalable manufacturing and rigorous quality systems.

The 74HCT173D,652 belongs to Nexperia's 74HCT logic family, engineered for TTL-compatible interfacing in industrial control and instrumentation applications where robustness, wide temperature operation, and bus-sharing capability are critical.

FAQ

What is the minimum setup time (tsu) for Dn inputs relative to the CP rising edge?

The 74HCT173D,652 requires a minimum setup time of 12 ns (typical) and 15 ns (max) for Dn inputs before the LOW-to-HIGH CP transition at VCC = 4.5 V and CL = 50 pF. This ensures reliable data capture without metastability, as verified in Table 8 of the official Nexperia datasheet Rev. 5 (Jan 2024).

Can OE1 and OE2 be tied together and driven by a single microcontroller GPIO?

Yes - OE1 and OE2 are electrically independent but functionally identical (both active LOW). They may be paralleled and driven by one GPIO without risk; total DC input current per pin remains within specification (≤245 μA max at VCC = 5.5 V), and no timing skew is introduced since enable action is combinatorial.

Does the 74HCT173D,652 support hot insertion or live bus swapping?

No - the device lacks hot-swap protection circuitry. While input clamp diodes tolerate brief overvoltage, applying VCC after signal inputs (or vice versa) risks latch-up or damage. Always power VCC and GND before applying logic signals, and use series resistors if hot-plug operation is required.

How does the master reset (MR) interact with output enable (OE1/OE2) during assertion?

When MR is HIGH, Q0–Q3 are forced LOW immediately and asynchronously - regardless of OE1/OE2 state. If OE1 or OE2 is also HIGH, outputs enter high-impedance state *after* being driven LOW, resulting in a brief LOW pulse followed by Z-state; this behavior is documented in Table 4 (3-state buffer operating mode).