Nexperia USA Inc. 74HC173DB,118

Overview

74HC173DB,118 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 2.0–6.0 V, supports -40 °C to +125 °C, and delivers 35 ns propagation delay (VCC = 6.0 V) and 95 MHz max clock frequency. Used in synchronous data latching and bus interface logic in industrial control systems.

For engineers reviewing the 74HC173DB,118 datasheet, 74HC173DB,118 pinout, 74HC173DB,118 application, or 74HC173DB,118 equivalent, this page provides verified functional behavior, SO16 package mapping, timing constraints (tsu = 10 ns, th = 1 ns @ VCC = 6.0 V), 3-state control semantics, and validated alternatives for register-based digital logic design.

Technical Context

The device implements four independent edge-triggered D flip-flops sharing common CP, MR, E1/E2, and OE1/OE2 controls. Its gated input enables (E1/E2) allow selective hold mode without clock dependency, while OE1/OE2 independently place Q0–Q3 into high-impedance states without affecting internal register state.

Asynchronous MR forces all outputs LOW regardless of clock or data; inputs include clamp diodes enabling safe interfacing to voltages exceeding VCC via current-limiting resistors. The logic conforms to JEDEC 7A and supports both CMOS-level (74HC) and TTL-level (74HCT) input thresholds.

Key Specifications

Pinout & Package

74HC173DB,118 is supplied in SO16 (SOT109-1) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm lead pitch, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC173DB,118, the 74HCT173DB,118 offers superior TTL input compatibility at no timing cost, while SN74HC173N trades surface-mount efficiency and input protection for through-hole serviceability - selection depends on interface voltage family and assembly method.

Availability

74HC173DB,118 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, test equipment pattern generation, communications backplane interface, and motor control logic sequencer applications requiring stable component supply across extended temperature ranges.

Supply support for 74HC173DB,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 global semiconductor expert focused on high-volume, high-reliability logic, discrete, and MOSFET solutions for industrial, automotive, and consumer markets.

The 74HC173 belongs to Nexperia's 74HC logic family - designed for low-power, high-noise-immunity digital interfacing in space-constrained industrial control and instrumentation systems.

FAQ

What is the function of the E1 and E2 pins on the 74HC173DB,118?

E1 and E2 are active-LOW data enable inputs that gate the transfer of D0–D3 to Q0–Q3. When both are LOW, the next CP rising edge loads data; if either is HIGH, outputs hold their previous state regardless of clock or input changes. This enables selective register freezing without clock gating or additional logic.

Can OE1 and OE2 be used independently to control individual outputs?

No - OE1 and OE2 are not per-output controls. Both must be LOW to enable all Q0–Q3 simultaneously; asserting either HIGH disables all four outputs to high-impedance. There is no provision for selective 3-state control of individual Qn lines within this device.

Does the 74HC173DB,118 support hot insertion or live bus connection?

Yes - input clamp diodes allow safe connection to powered buses up to VCC + 0.5 V when series current-limiting resistors are used. However, outputs must be in high-impedance state (OE1=OE2=HIGH) during insertion to avoid contention; MR should be asserted until configuration completes.

How does the master reset (MR) interact with the output enable (OE) state?

MR is fully asynchronous and overrides all other controls: when HIGH, it forces Q0–Q3 to LOW immediately, regardless of OE1/OE2 state. If OE1/OE2 are HIGH during MR assertion, outputs go LOW then instantly enter high-impedance - resulting in brief LOW pulse followed by Z-state.