Nexperia USA Inc. 74HC166D-Q100J

Overview

74HC166D-Q100 from Nexperia is an AEC-Q100 Grade 1 qualified 8-bit parallel-in/serial-out shift register with CMOS-level inputs, synchronous parallel load (PE active LOW), serial shift (DS input), and serial output (Q7). It operates from 2.0 V to 6.0 V across -40 °C to +125 °C and supports automotive body control modules requiring deterministic timing and latch-up immunity >100 mA.

For engineers reviewing the 74HC166D-Q100 datasheet, 74HC166D-Q100 pinout, 74HC166D-Q100 application, or 74HC166D-Q100 equivalent, this device serves as a synchronous data serializer in CAN gateway interfaces, LED matrix drivers, and distributed I/O expanders where parallel-to-serial conversion must coexist with master reset (MR) and clock enable (CE) control under harsh thermal conditions.

Technical Context

The 74HC166D-Q100 implements an 8-stage edge-triggered shift register with dual-path data entry: parallel load occurs on the LOW-to-HIGH CP transition when PE is LOW; serial shift occurs on the same edge when PE is HIGH and CE is LOW. Its asynchronous MR input forces all outputs LOW independently of clock state.

Input clamping diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. The device uses standard CMOS logic thresholds (VIH = 3.15 V min at VCC = 4.5 V; VIL = 1.35 V max), delivers VOH ≥ 3.98 V and VOL ≤ 0.26 V at 4.0 mA drive, and achieves fmax = 57 MHz typical at VCC = 4.5 V with CL = 15 pF.

Key Specifications

Pinout & Package

74HC166D-Q100 is housed in a plastic small outline package (SO16) per SOT109-1, with 16 leads, 3.9 mm body width, and standard 1.27 mm lead pitch. Pin 1 is marked by a notch or dot; pin numbering follows counter-clockwise convention from top-left corner.

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-Q100, the TTL-input variant eases integration with 5 V logic but offers no advantage in pure CMOS systems; versus SN74HC165QPWRQ1, the 74HC166D-Q100's dedicated PE pin simplifies deterministic parallel load timing without clock inversion overhead.

Availability

74HC166D-Q100 is available at Aetrix Electronics and suitable for automotive body control units, LED matrix drivers, industrial PLC digital input modules, and CAN gateway interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC166D-Q100 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 MOSFET solutions optimized for automotive, industrial, and consumer applications with emphasis on reliability and AEC-Q100 compliance.

The 74HC166D-Q100 belongs to Nexperia's automotive-qualified HC logic family, designed specifically for robust serial data conversion in safety-critical vehicle subsystems where timing predictability and thermal resilience are mandatory.

FAQ

What is the minimum pulse width required on the CP input at 5 V supply?

At VCC = 4.5 V, the minimum HIGH and LOW pulse width for CP is 16 ns each, as specified in Table 7. This ensures reliable edge detection and avoids metastability in internal flip-flops. Pulse widths below this value risk skipped clocks or incomplete register updates, especially under worst-case process/voltage/temperature corners.

Can the 74HC166D-Q100 be used with a 3.3 V microcontroller driving its inputs?

Yes - the 74HC166D-Q100's VIH is 1.5 V min at VCC = 2.0 V and 3.15 V min at VCC = 4.5 V. With VCC = 3.3 V, VIH ≈ 2.3 V (interpolated), which is safely exceeded by a 3.3 V MCU's 2.7–3.3 V HIGH output. No level shifter is needed for 3.3 V CMOS drive.

How does the master reset (MR) interact with the clock enable (CE) signal?

MR is asynchronous and overrides all other controls: when MR is LOW, Q7 and all internal stages force LOW regardless of CE, PE, or CP state. CE only gates CP when MR is HIGH; it has no effect during MR assertion. This priority ensures fail-safe reset even if CE is stuck HIGH.

Is there a recommended PCB layout practice for minimizing switching noise on the VCC pin?

Place a 100 nF X7R ceramic capacitor between VCC and GND within 3 mm of pins 8 and 16, using short wide traces. Route GND under the IC body with solid plane coverage. Avoid routing high-speed signals (CP, DS, Q7) adjacent to VCC/GND; separate analog and digital ground regions only if necessary, joined at single point near decoupling cap.