Nexperia USA Inc. 74HC166D,653

Overview

74HC166D,653 from Nexperia is an 8-bit parallel-in/serial-out shift register with synchronous parallel load, serial shift, and asynchronous master reset. It operates from 2.0 V to 6.0 V, features CMOS-level inputs, edge-triggered clock (LOW-to-HIGH), and delivers propagation delay as low as 14 ns at 6.0 V - used in microcontroller I/O expansion, LED matrix controllers, and industrial data serialization.

For engineers reviewing the 74HC166D,653 datasheet, 74HC166D,653 pinout, 74HC166D,653 application, or 74HC166D,653 equivalent, key selection criteria include parallel load timing (t_su/t_h), serial shift rate (f_max = 68 MHz at 6.0 V), MR reset behavior, CE-controlled clock gating, and SO16 package thermal derating above 110 °C.

Technical Context

This device implements a synchronous 8-stage shift register with dual-path input control: when PE is LOW, D0–D7 load in parallel on CP's rising edge; when PE is HIGH, serial data enters via DS on each CP rising edge. CE enables/disables clock propagation - a HIGH on CE blocks CP transitions from affecting internal state.

The architecture includes an asynchronous active-LOW master reset (MR) that clears all flip-flops regardless of clock or enable states, and incorporates input clamp diodes for overvoltage tolerance with current-limiting resistors. All outputs drive ±25 mA and meet JEDEC JESD7A and JESD8C standards.

Key Specifications

Pinout & Package

74HC166D,653 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 index dot; the package is RoHS-compliant and rated for reflow soldering per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit parallel-in/serial-out shift register applications.

Compared with 74HCT166D,653, the HC variant offers lower static current and wider VCC range but requires CMOS-level drive; versus SN74HC165DR, the 74HC166D,653 provides true synchronous parallel load with single-pin enable and guaranteed setup/hold timing for deterministic state capture.

Availability

74HC166D,653 is available at Aetrix Electronics and suitable for microcontroller I/O expansion, LED matrix driving, industrial sensor aggregation, and programmable logic interface bridging requiring stable component supply across extended temperature ranges.

Supply support for 74HC166D,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, reliable, and efficient logic, analog, and MOSFET solutions for automotive, industrial, and consumer applications.

The 74HC166 belongs to Nexperia's 74HC high-speed CMOS logic family, designed for low-power, noise-immune digital interfacing in space-constrained and thermally demanding systems.

FAQ

What is the maximum clock frequency supported by the 74HC166D,653?

The 74HC166D,653 supports a maximum clock frequency of 68 MHz at VCC = 6.0 V and Tamb = 25 °C. At VCC = 4.5 V, f_max is 57 MHz; at VCC = 2.0 V, it drops to 19 MHz. These values assume CL = 50 pF and tr/tf = 6 ns. Derating applies above 110 °C ambient due to SO16 package thermal limits.

How does the master reset (MR) interact with clock enable (CE) and parallel enable (PE)?

MR is asynchronous and dominant: when asserted LOW, it immediately clears all eight flip-flops to logic LOW, overriding CE, PE, CP, and DS states. MR requires no clock edge and functions even when CE = HIGH (clock disabled) or PE is floating. Release of MR must occur while CP is LOW to avoid metastability on the first subsequent rising edge.

Can the 74HC166D,653 operate reliably at 3.3 V supply?

Yes - the 74HC166D,653 is fully specified from 2.0 V to 6.0 V. At VCC = 3.3 V, VIH = 2.31 V (70 % of VCC), VIL = 1.09 V (33 % of VCC), t_pd ≈ 22 ns (CP to Q7), and f_max ≈ 45 MHz. Input clamp diodes remain functional, and static current remains below 160 μA across -40 °C to +125 °C.

Is there a recommended layout practice for minimizing switching noise on the VCC and GND pins?

Place a 100 nF X7R ceramic capacitor between VCC (pin 16) and GND (pin 8) within 3 mm of the SO16 footprint, with short, wide traces. Route GND directly to a solid ground plane; avoid daisy-chaining GND connections. Keep CP, MR, and PE traces short and away from noisy analog or power lines to prevent false triggering.