NXP Semiconductors 74HCT173N,652

Overview

74HCT173N,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 up to 80 MHz clock frequency at 4.5 V, and is rated for -40 °C to +125 °C ambient temperature. It is used in synchronous data latching and bus interface logic in industrial control systems.

For engineers reviewing the 74HCT173N,652 datasheet, 74HCT173N,652 pinout, 74HCT173N,652 application, or 74HCT173N,652 equivalent, key selection criteria include TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), 3-state output control independence from flip-flop state, propagation delay of 20 ns (typ) from CP to Qn at 4.5 V, and SO16 package compatibility with legacy 74-series board layouts.

Technical Context

The 74HCT173N,652 implements four independent edge-triggered D registers sharing a common clock (CP) and master reset (MR). Input enables E1 and E2 gate data loading: both must be LOW for Dn-to-Qn transfer on the LOW-to-HIGH CP transition; either HIGH forces hold mode. Output enables OE1 and OE2 independently place Q0–Q3 into high-impedance state without affecting internal register state.

Its TTL-level input compatibility (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V) ensures direct interfacing with legacy 5 V TTL logic families. The device features clamp diodes on all inputs, enabling safe use with current-limiting resistors when interfacing to voltages exceeding VCC, and meets JEDEC standard no. 7A for commercial and extended temperature operation.

Key Specifications

Pinout & Package

74HCT173N,652 is supplied in a plastic small outline package (SO16), SOT109-1, with 16 leads and 3.9 mm body width. Pin 1 is index-marked; lead pitch is 1.27 mm.

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 74HCT173N,652 offers identical performance and drop-in compatibility; versus SN74HCT173N, it delivers tighter propagation delay and higher maximum clock frequency, making it preferable for timing-sensitive industrial control loops.

Availability

74HCT173N,652 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and motor control applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for 74HCT173N,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 leading semiconductor manufacturer specializing in high-performance logic, analog, and discrete components, with core expertise in automotive-grade and industrial reliability.

The 74HCT173N,652 belongs to Nexperia's 74HCT logic family, designed specifically for robust 5 V TTL-to-CMOS interfacing in harsh industrial environments with extended temperature range and ESD-hardened inputs.

FAQ

What is the supply voltage range for the 74HCT173N,652?

The 74HCT173N,652 operates over a supply voltage range of 4.5 V to 5.5 V. It is not specified for 3.3 V operation, and operation outside this range may cause functional failure or permanent damage. The recommended operating condition specifies VCC = 4.5 V to 5.5 V, with typical performance characterized at 4.5 V and 5.0 V. Always use local 100 nF ceramic decoupling between VCC and GND pins of the 74HCT173N,652 to ensure stable switching behavior.

Does the 74HCT173N,652 support 3.3 V logic inputs?

No, the 74HCT173N,652 does not reliably support 3.3 V logic inputs. Its TTL-compatible input thresholds require VIH ≥ 2.0 V (min) and VIL ≤ 0.8 V (max) at VCC = 4.5–5.5 V. A 3.3 V HIGH signal falls below the guaranteed VIH margin and may result in indeterminate operation, especially over temperature or process variation. For 3.3 V system interfacing, a level-shifting buffer or a 74LVC-series alternative is required. The 74HCT173N,652 is intended for 5 V TTL/CMOS mixed-signal environments.

How does the master reset (MR) pin behave on the 74HCT173N,652?

The MR pin on the 74HCT173N,652 is an asynchronous active-HIGH reset. When MR is driven HIGH, all four Q outputs are forced LOW immediately, regardless of clock state, input enables, or data inputs. This action overrides all other control signals and occurs within 20 ns (max) at VCC = 4.5 V. The MR function remains effective even if E1, E2, or OE1/OE2 are asserted. To avoid spurious resets, MR must be held LOW during normal operation and stabilized before asserting HIGH, with a minimum pulse width of 15 ns.

Can the 74HCT173N,652 outputs be independently controlled?

No, the 74HCT173N,652 does not support per-output enable control. It has two shared output enable inputs - OE1 (pin 1) and OE2 (pin 2) - which jointly control all four Q outputs (Q0–Q3). When either OE1 or OE2 is HIGH, all four outputs enter high-impedance (OFF) state simultaneously. There is no provision for individual Qn tri-state control. This architecture is optimized for bus-oriented applications where groups of signals require coordinated enable/disable, not per-signal isolation.

What package type is used for the 74HCT173N,652?

The 74HCT173N,652 uses the SO16 plastic small outline package (SOT109-1), with 16 leads, 3.9 mm body width, and 1.27 mm lead pitch. This is a standard through-hole-compatible surface-mount package widely used in industrial PCBs. It is distinct from the TSSOP16 (SOT403-1) variant - the "N" suffix in 74HCT173N,652 explicitly denotes the SO16 package. Thermal characteristics and soldering profiles follow JEDEC MS-012 standards, and the package includes plastic protrusions compliant with 0.15 mm maximum per side.